/* ============================================
   eXueed Unified Design System
   Modern, clean, and consistent styling
   ============================================ */

:root {
    /* Color Palette - Solid colors only, no gradients */
    --primary: #e11d48;
    --primary-dark: #be123c;
    --primary-light: #fb7185;
    --secondary: #db2777;
    --secondary-dark: #be185d;
    --accent: #f43f5e;
    --accent-dark: #be123c;
    --danger: #b91c1c;
    --danger-dark: #991b1b;
    
    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-sans: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 18px;
    scroll-behavior: smooth;
}

body,
input,
textarea,
button,
select {
    font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-600);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--primary-dark);
}

/* ============================================
   Layout Components
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-2xl) 0;
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: none;
    background-color: #ffffff;
}

/* Preferences button positioned below header, aligned with logout */
.preferences-trigger {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    z-index: 10;
}

.preferences-trigger .btn {
    background: var(--gray-50);
    box-shadow: none;
    border: 1px solid var(--gray-200);
    font-size: 0.8rem;
    padding: 0.3rem 0.75rem;
}

.preferences-trigger .btn:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

/* Preferences toggle inline (next to button) */
.preferences-toggle-inline {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.preferences-toggle-inline input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.preferences-toggle-slider {
    width: 36px;
    height: 20px;
    background: var(--gray-300);
    border-radius: 20px;
    transition: background 0.2s ease;
    position: relative;
}

.preferences-toggle-slider::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.2s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.preferences-toggle-inline input:checked + .preferences-toggle-slider {
    background: var(--secondary);
}

.preferences-toggle-inline input:checked + .preferences-toggle-slider::before {
    transform: translateX(16px);
}

.preferences-status {
    font-size: 0.75rem;
    color: var(--gray-500);
    white-space: nowrap;
}

.preferences-status.active {
    color: var(--secondary);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 48px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
    align-items: center;
}

.nav-auth {
    display: flex;
    align-items: center;
}

.nav-auth .btn {
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-auth .btn.btn-primary:hover {
    color: white;
}

.nav-auth .btn.btn-outline:hover {
    background: var(--gray-50);
}

.nav-auth .btn.btn-primary {
    box-shadow: var(--shadow-sm);
    border: 2px solid transparent;
    color: #ffffff;
}

.nav-auth .btn.btn-primary:hover {
    box-shadow: var(--shadow-md);
}

.auth-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    background: var(--secondary);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   Hero Search Layout (Homepage)
   ============================================ */
.hero {
    padding-top: var(--spacing-xl);
    position: relative;
}

.hero-inner {
    max-width: 980px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-logo img {
    width: min(480px, 86vw);
    height: auto;
}

.hero-search {
    width: min(920px, 94%);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.1rem;
    border: 2px solid var(--gray-100);
    border-radius: 32px;
    background: white;
    box-shadow: var(--shadow-md);
    position: relative;
    z-index: 2;
    transition: border-radius 0.2s ease;
}

.hero-search.expanded {
    border-radius: 20px;
}

.hero-search.hidden {
    display: none;
}

.hero-input {
    flex: 1;
    border: none;
    resize: none;
    outline: none;
    font-size: 1.4rem;
    padding: 1rem 1.2rem;
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: transparent;
    line-height: 1.4;
    pointer-events: auto;
    min-height: 1.4em;
    max-height: 40vh;
    overflow-y: auto;
    transition: height 0.1s ease-out;
}

.hero-input::placeholder {
    color: var(--gray-400);
}

.hero-button {
    width: 64px;
    height: 64px;
    border-radius: 999px;
    border: none;
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), background var(--transition-base);
    pointer-events: auto;
}

.hero-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.hero-arrow {
    font-size: 2.2rem;
    line-height: 1;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
    position: relative;
    z-index: 1;
    order: 0;
}

.hero-actions.shift-left {
    justify-content: flex-start;
    width: min(980px, 94%);
    order: 10;
}

.mode-select {
    width: min(360px, 92%);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

/* Trial Match Toggle */
.trial-match-toggle {
    margin-top: 0.75rem;
    display: flex;
    justify-content: center;
}

.toggle-switch-inline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.toggle-switch-inline input {
    display: none;
}

.toggle-slider-sm {
    width: 36px;
    height: 20px;
    background: var(--gray-300);
    border-radius: 10px;
    position: relative;
    transition: background 0.2s ease;
}

.toggle-slider-sm::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.2s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-switch-inline input:checked + .toggle-slider-sm {
    background: var(--primary);
}

.toggle-switch-inline input:checked + .toggle-slider-sm::after {
    transform: translateX(16px);
}

.toggle-label-sm {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.toggle-hint {
    font-size: 0.75rem;
    color: var(--gray-400);
    cursor: help;
    margin-left: 0.25rem;
}

.toggle-hint:hover {
    color: var(--gray-600);
}

.feature-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin: var(--spacing-lg) 0;
}

.page-logo {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.page-logo img {
    width: 90px;
    height: auto;
}

.hero-logo-small img {
    width: 100px;
    height: auto;
}

.hero-chat {
    width: min(1200px, 96%);
    min-height: 220px;
    max-height: 380px;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: transparent;
    border: none;
    box-shadow: none;
    transition: max-height var(--transition-slow), all 0.3s ease;
}

.hero-chat.chat-expanded {
    max-height: 1200px;
    min-height: 460px;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    order: 5;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.hero-chat.chat-expanded .chat-messages {
    padding: 0;
}

.hero-chat .chat-messages {
    padding: 0;
    max-height: 1200px;
    overflow-y: auto;
    background: transparent;
}

.hero-chat .message-content {
    font-size: 1.15rem;
}

/* Chat Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--gray-100);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border-bottom: 1px solid var(--gray-200);
}

.chat-header-title {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.chat-header-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-fullscreen {
    background: transparent;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    padding: 0.375rem 0.625rem;
    cursor: pointer;
    color: var(--gray-600);
    font-size: 1rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-fullscreen:hover {
    background: var(--gray-200);
    color: var(--gray-800);
    border-color: var(--gray-400);
}

/* Fullscreen Mode */
.hero-chat.chat-fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 100%;
    height: 100vh;
    max-height: 100vh;
    min-height: 100vh;
    z-index: 9999;
    background: white;
    border-radius: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.hero-chat.chat-fullscreen .chat-header {
    border-radius: 0;
    padding: 1rem 1.5rem;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    flex-shrink: 0;
}

.hero-chat.chat-fullscreen .chat-header-title {
    font-size: 1.1rem;
}

.hero-chat.chat-fullscreen .chat-messages {
    flex: 1;
    max-height: none;
    padding: 1.5rem;
    overflow-y: auto;
}

.hero-chat.chat-fullscreen .hero-search {
    flex-shrink: 0;
    padding: 1rem 1.5rem;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    margin: 0;
    width: 100%;
    max-width: 100%;
}

.hero-chat.chat-fullscreen .hero-search .hero-input {
    max-width: 100%;
}

/* Wider messages in fullscreen when no study panel is open */
.hero-chat.chat-fullscreen .message {
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.hero-chat.chat-fullscreen .conversation-indicator {
    flex-shrink: 0;
    padding: 0.5rem 1.5rem;
    background: var(--gray-50);
}

/* Hide other elements when in fullscreen */
body.chat-fullscreen-active .header,
body.chat-fullscreen-active .footer,
body.chat-fullscreen-active .hero-examples,
body.chat-fullscreen-active .hero-actions,
body.chat-fullscreen-active .mode-select,
body.chat-fullscreen-active .preferences-sidebar,
body.chat-fullscreen-active .sidebar-overlay {
    display: none !important;
}

/* Sidebar: anchor to top of viewport in fullscreen (header is hidden) and sit above chat */
body.chat-fullscreen-active .side-nav-panel {
    top: 0 !important;
    height: 100vh !important;
    z-index: 10001 !important;
}

/* Fullscreen chat: shift right to leave room for sidebar */
body.chat-fullscreen-active:has(.side-nav-panel:not(.collapsed)) .hero-chat.chat-fullscreen {
    left: 220px !important;
    width: calc(100% - 220px) !important;
}
body.chat-fullscreen-active:has(.side-nav-panel.collapsed) .hero-chat.chat-fullscreen {
    left: 56px !important;
    width: calc(100% - 56px) !important;
}

/* Hide the floating logo in fullscreen — sidebar already has it */
body.chat-fullscreen-active .hero-logo {
    display: none !important;
}

/* Hide study details panel in fullscreen UNLESS split view is active */
body.chat-fullscreen-active:not(.split-view-active) .study-details-panel {
    display: none !important;
}

body.chat-fullscreen-active {
    overflow: hidden;
}

body.chat-fullscreen-active .section.hero {
    padding: 0;
    min-height: 100vh;
}

body.chat-fullscreen-active .section.hero .container {
    max-width: 100%;
    padding: 0;
}

body.chat-fullscreen-active .section.hero .hero-inner {
    max-width: 100%;
    padding: 0;
}

/* ============================================
   Fullscreen + Split View Mode
   ============================================ */

/* When both fullscreen and split view are active */
body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen {
    width: 50% !important;
    left: 0 !important;
    right: 50% !important;
    max-width: 50% !important;
}

body.chat-fullscreen-active.split-view-active .study-details-panel {
    display: flex !important;
    position: fixed;
    top: 0;
    right: 0 !important;
    left: 50% !important;
    width: 50% !important;
    height: 100vh;
    z-index: 10000;
    border-left: 1px solid var(--gray-200);
    background: white;
}

body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen .chat-messages {
    max-height: calc(100vh - 180px);
}

body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen .message {
    max-width: 100%;
    padding-right: 1rem;
}

/* Study Q&A in fullscreen mode */
body.chat-fullscreen-active.study-qa-active .study-qa-panel {
    display: flex;
    z-index: 10001;
}

body.chat-fullscreen-active.study-qa-active .study-details-panel {
    right: 50%;
    width: 25%;
}

body.chat-fullscreen-active.study-qa-active .hero-chat.chat-fullscreen {
    width: 25%;
    right: 75%;
}

/* Responsive: Stack vertically on smaller screens in fullscreen split view */
@media (max-width: 1200px) {
    body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen {
        width: 100% !important;
        max-width: 100% !important;
        left: 0 !important;
        right: 0 !important;
        height: 50vh !important;
        top: 0 !important;
        bottom: auto !important;
    }
    
    body.chat-fullscreen-active.split-view-active .study-details-panel {
        width: 100% !important;
        height: 50vh !important;
        top: 50vh !important;
        left: 0 !important;
        right: 0 !important;
    }
    
    body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen .chat-messages {
        max-height: calc(50vh - 180px);
    }
}

@media (max-width: 768px) {
    body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen {
        height: 40vh !important;
        top: 0 !important;
        bottom: auto !important;
    }
    
    body.chat-fullscreen-active.split-view-active .study-details-panel {
        height: 60vh !important;
        top: 40vh !important;
    }
    
    body.chat-fullscreen-active.split-view-active .hero-chat.chat-fullscreen .chat-messages {
        max-height: calc(40vh - 150px);
    }
}

.ai-more-info {
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    padding-top: var(--spacing-md);
}

.ai-more-info summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-700);
    list-style: none;
}

.ai-more-info summary::-webkit-details-marker {
    display: none;
}

.ai-more-info summary::after {
    content: "▾";
    display: inline-block;
    margin-left: 0.5rem;
    color: var(--gray-400);
}

.ai-more-info[open] summary::after {
    content: "▴";
}

.ai-sources {
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    padding-top: var(--spacing-md);
}

.ai-sources summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-700);
    list-style: none;
}

.ai-sources summary::-webkit-details-marker {
    display: none;
}

.ai-sources summary::after {
    content: "▾";
    display: inline-block;
    margin-left: 0.5rem;
    color: var(--gray-400);
}

.ai-sources[open] summary::after {
    content: "▴";
}

.message-metadata {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-100);
    color: var(--gray-700);
    font-size: 0.85rem;
}

.message-metadata pre {
    margin: 0;
    white-space: pre-wrap;
    font-family: var(--font-sans);
}

.hero-chat .hero-search {
    width: 100%;
    margin-top: var(--spacing-lg);
}

.hero-search.chat-composer {
    width: 100%;
}

.hero-examples {
    width: min(900px, 92%);
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-examples.hidden {
    display: none;
}

.hero-examples summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-700);
    list-style: none;
}

.hero-examples summary::-webkit-details-marker {
    display: none;
}

.hero-examples summary::after {
    content: "▾";
    display: inline-block;
    margin-left: 0.5rem;
    color: var(--gray-400);
}

.hero-examples[open] summary::after {
    content: "▴";
}

.hero-example-grid {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--spacing-md);
}

.hero-chat .message-content {
    font-size: 1.1rem;
}

.nav-links a {
    color: var(--gray-600);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary);
    background: var(--gray-100);
}

.nav-links a.active {
    color: var(--primary);
    background: var(--gray-100);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--secondary);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-dark);
}

.btn-accent {
    background: var(--accent);
    color: white;
}

.btn-accent:hover:not(:disabled) {
    background: var(--accent-dark);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-dark);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--gray-50);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.125rem;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: white;
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.card-body {
    padding: var(--spacing-lg);
    background: #ffffff;
}

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    background: #ffffff;
}

/* ============================================
   Chat Interface
   ============================================ */

.chat-container {
    display: flex;
    flex-direction: column;
    height: 600px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    background: #ffffff;
}

.message {
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--primary);
    color: white;
}

.message.ai .message-avatar {
    background: var(--gray-200);
    color: var(--gray-700);
}

.message-content {
    max-width: 70%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    line-height: 1.6;
}

.message.user .message-content {
    background: var(--primary);
    color: white;
    border-bottom-right-radius: var(--radius-sm);
}

.message.ai .message-content {
    background: white;
    color: var(--gray-800);
    border: 1px solid var(--gray-200);
    border-bottom-left-radius: var(--radius-sm);
}

.message-sources {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.message.user .message-sources {
    border-top-color: rgba(255, 255, 255, 0.3);
}

.message.ai .message-sources {
    border-top-color: var(--gray-200);
}

/* Markdown styling in messages */
.message-content h2,
.message-content h3,
.message-content h4 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--gray-900);
}

.message-content h2 {
    font-size: 1.25rem;
}

.message-content h3 {
    font-size: 1.125rem;
}

.message-content h4 {
    font-size: 1rem;
}

.message-content p {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.message-content ul,
.message-content ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.message-content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.message-content strong {
    font-weight: 600;
    color: var(--gray-900);
}

.message-content em {
    font-style: italic;
}

.source-item {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: var(--spacing-sm);
}

.message.user .source-item {
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   Collapsible Section (More Information)
   ============================================ */

.collapsible-section {
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    padding-top: var(--spacing-md);
}

.collapsible-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: all var(--transition-base);
    min-height: 44px; /* Touch-friendly tap target */
}

.collapsible-toggle:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

.collapsible-toggle:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.toggle-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toggle-icon {
    font-size: 0.75rem;
    transition: transform var(--transition-base);
    display: inline-block;
}

.toggle-icon.rotated {
    transform: rotate(180deg);
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.collapsible-content.expanded {
    max-height: 50000px; /* Large enough for any content */
    overflow-y: visible;
    padding-top: var(--spacing-md);
}

.collapsible-content .message-sources {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.chat-input-container {
    padding: var(--spacing-lg);
    background: white;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--spacing-md);
}

.chat-input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-sans);
    resize: none;
    min-height: 60px;
    max-height: 150px;
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ============================================
   Tabs
   ============================================ */

.tabs-container {
    margin-top: var(--spacing-xl);
}

.tabs {
    display: flex;
    gap: var(--spacing-sm);
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: var(--spacing-lg);
}

.tab-button {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    background: transparent;
    color: var(--gray-600);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-base);
    font-family: var(--font-sans);
}

.tab-button:hover {
    color: var(--primary);
    background: var(--gray-50);
}

.tab-button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* ============================================
   Mode Selector
   ============================================ */

.mode-selector {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: #ffffff;
    border-bottom: 1px solid var(--gray-200);
    flex-wrap: wrap;
}

.mode-button {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: all var(--transition-base);
}

.mode-button:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.mode-button.active {
    background: var(--primary);
    color: white;
}

/* ============================================
   Results & Lists
   ============================================ */

.results-container {
    margin-top: var(--spacing-xl);
}

.result-item {
    background: white;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary);
    transition: all var(--transition-base);
}

.result-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-md);
}

.result-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.result-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--gray-500);
    flex-wrap: wrap;
}

.result-score {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--secondary);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.875rem;
}

.result-content {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ============================================
   Loading States
   ============================================ */

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    color: var(--gray-500);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Alerts & Messages
   ============================================ */

.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--secondary);
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--primary);
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--accent);
}

/* ============================================
   Comparison Tables
   ============================================ */

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.comparison-card {
    background: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-200);
}

.comparison-card h4 {
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.stat-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin: var(--spacing-xs);
}

.stat-badge.significant {
    background: var(--secondary);
}

/* ============================================
   Footer
   ============================================ */

/* Sticky footer layout */
html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.section {
    flex: 1 0 auto;
}

.footer {
    flex-shrink: 0;
    background: var(--gray-900);
    color: var(--gray-400);
    padding: var(--spacing-2xl) 0;
    margin-top: auto;
    text-align: center;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-section a {
    display: block;
    color: var(--gray-400);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-base);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-links {
        display: none;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    /* Collapsible section responsive */
    .collapsible-toggle {
        padding: var(--spacing-md);
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .chat-container {
        height: 500px;
    }
    
    .mode-selector {
        justify-content: center;
    }
    
    .mode-button {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* Reduced motion support for accessibility */
@media (prefers-reduced-motion: reduce) {
    .collapsible-content {
        transition: none;
    }
    
    .toggle-icon {
        transition: none;
    }
    
    .collapsible-toggle {
        transition: none;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

.fade-in {
    animation: fadeIn 0.3s ease;
}


/* ============================================
   Split View Layout for Study Details
   ============================================ */

/* When split view is active */
body.split-view-active {
    overflow: hidden;
}

body.split-view-active .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

/* Hide footer in split view */
body.split-view-active .footer {
    display: none;
}

/* Main section takes left half */
body.split-view-active .section {
    position: fixed;
    top: 80px;
    left: 0;
    width: 50%;
    height: calc(100vh - 80px);
    overflow-y: auto;
    padding: 0;
    margin: 0;
}

body.split-view-active .section > .container {
    max-width: 100%;
    width: 100%;
    padding: var(--spacing-md);
    height: auto;
}

/* Study Details Panel - right half */
.study-details-panel {
    display: none;
    flex-direction: column;
    background: var(--gray-50);
    height: 100%;
    overflow: hidden;
    border-left: 1px solid var(--gray-200);
}

body.split-view-active .study-details-panel {
    display: flex;
    position: fixed;
    top: 80px;
    right: 0;
    width: 50%;
    height: calc(100vh - 80px);
    z-index: 50;
}

/* Hero section adjustments for split view */
body.split-view-active .section.hero .hero-inner {
    max-width: 100%;
    padding: 0;
}

body.split-view-active .section.hero .hero-logo {
    display: none;
}

body.split-view-active .section.hero .hero-chat {
    width: 100%;
}

body.split-view-active .section.hero .hero-chat .chat-messages {
    max-height: calc(100vh - 350px);
    overflow-y: auto;
}

body.split-view-active .section.hero .hero-actions {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 0.5rem;
}

body.split-view-active .section.hero .mode-select {
    display: none;
}

.panel-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--gray-400);
    font-size: 1rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--spacing-lg);
    background: white;
    border-bottom: 1px solid var(--gray-200);
    flex-shrink: 0;
}

.panel-title-area {
    flex: 1;
    min-width: 0;
}

.panel-header h3 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.125rem;
    color: var(--gray-900);
    line-height: 1.3;
    word-wrap: break-word;
}

.panel-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.meta-item {
    font-size: 0.75rem;
    color: var(--gray-500);
    background: var(--gray-100);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    flex-shrink: 0;
    margin-left: var(--spacing-md);
}

.close-btn:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

/* Study Section Styles */
.study-section {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--gray-50);
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-base);
}

.section-header:hover {
    background: var(--gray-100);
}

.section-title-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.section-header h4 {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--gray-800);
    font-weight: 600;
}

.expand-icon {
    color: var(--gray-400);
    font-size: 0.75rem;
    transition: transform var(--transition-base);
}

.section-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.section-content.expanded {
    max-height: 1000px;
    padding: var(--spacing-md);
    border-top: 1px solid var(--gray-100);
}

.field-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-100);
    align-items: start;
}

.field-row:last-child {
    border-bottom: none;
}

.field-label {
    font-weight: 500;
    color: var(--gray-600);
    font-size: 0.8125rem;
}

.field-value {
    color: var(--gray-800);
    font-size: 0.875rem;
    word-break: break-word;
    line-height: 1.5;
}

/* Clickable values with context */
.clickable-value {
    cursor: pointer;
    transition: background-color 0.2s;
}

.clickable-value:hover {
    background-color: var(--primary-light);
}

.field-context {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--gray-50);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.8125rem;
    color: var(--gray-600);
    line-height: 1.6;
}

.field-context em {
    font-style: italic;
}

/* Source section styling */
.source-section {
    margin-bottom: 0.5rem;
}

.source-section strong {
    display: block;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.source-text {
    margin: 0;
    padding: 0.5rem;
    background: white;
    border-radius: var(--radius-sm);
    font-style: italic;
    white-space: pre-wrap;
    max-height: 200px;
    overflow-y: auto;
}

/* Context table styling */
.context-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.5rem;
    font-size: 0.75rem;
}

.context-table th,
.context-table td {
    border: 1px solid var(--gray-300);
    padding: 4px 8px;
    text-align: left;
}

.context-table th {
    background: var(--gray-100);
    font-weight: 600;
}

.context-table td {
    background: white;
}

.no-value {
    color: var(--gray-400);
    font-style: italic;
}

.no-data {
    color: var(--gray-500);
    text-align: center;
    padding: var(--spacing-xl);
}

/* Tags for array values */
.tag {
    display: inline-block;
    background: var(--gray-100);
    color: var(--gray-700);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    margin: 2px 4px 2px 0;
}

.json-value {
    background: var(--gray-100);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    overflow-x: auto;
    margin: 0;
}

/* Confidence Badge */
.confidence-badge {
    display: inline-block;
    font-size: 0.6875rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.confidence-badge.high {
    background: #d1fae5;
    color: #065f46;
}

.confidence-badge.medium {
    background: #fef3c7;
    color: #92400e;
}

.confidence-badge.low {
    background: #fee2e2;
    color: #991b1b;
}

/* ============================================
   Source Citation with Study Details Button
   ============================================ */

.source-item {
    position: relative;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-100);
    transition: background var(--transition-base);
}

.source-item:last-child {
    border-bottom: none;
}

.source-item:hover {
    background: var(--gray-50);
}

.source-item:hover .study-details-btn {
    opacity: 1;
}

.source-citation {
    display: block;
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.5;
    padding-right: 120px;
}

.source-citation .patient-count {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--primary);
    background: var(--primary-light, rgba(37, 99, 235, 0.1));
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    margin-left: 0.25rem;
    font-weight: 500;
}

.study-details-btn {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.study-details-btn:hover {
    background: var(--primary-dark);
}

/* Always show button on touch devices */
@media (hover: none) {
    .study-details-btn {
        opacity: 1;
    }
}

/* ============================================
   Responsive Split View
   ============================================ */

@media (max-width: 1024px) {
    body.split-view-active .study-details-panel {
        width: 100%;
        height: 50vh;
        top: auto;
        bottom: 0;
    }
    
    body.split-view-active .section {
        height: 50vh;
        margin-top: 80px;
    }
}

@media (max-width: 768px) {
    body.split-view-active .study-details-panel {
        height: 60vh;
    }
    
    body.split-view-active .section {
        height: 40vh;
    }
    
    .panel-header {
        padding: var(--spacing-md);
    }
    
    .panel-header h3 {
        font-size: 1rem;
    }
    
    .field-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
    
    .field-label {
        font-weight: 600;
    }
    
    .source-citation {
        padding-right: 0;
    }
    
    .study-details-btn {
        position: static;
        transform: none;
        opacity: 1;
        margin-top: var(--spacing-sm);
        display: block;
        width: 100%;
    }
}


/* ============================================
   Preferences Sidebar
   ============================================ */

.preferences-sidebar {
    position: fixed;
    right: -400px;
    top: 0;
    width: 400px;
    height: 100vh;
    background: white;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.preferences-sidebar.open {
    right: 0;
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: white;
    z-index: 1;
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--gray-900);
}

.btn-close-sidebar {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 1.5rem;
    line-height: 1;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.2s, color 0.2s;
}

.btn-close-sidebar:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.sidebar-content {
    padding: 1.5rem;
}

.preference-section {
    margin-bottom: 1.5rem;
}

.preference-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    cursor: pointer;
    color: var(--gray-800);
    font-size: 0.875rem;
}

.filter-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}

.filter-checkbox:hover {
    color: var(--primary);
}

.range-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.range-inputs span {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.form-input-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    width: 100%;
}

.sidebar-divider {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: 1.5rem 0;
}

.sidebar-actions {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    position: sticky;
    bottom: 0;
    background: white;
    padding: 1rem 0;
    border-top: 1px solid var(--gray-100);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.toggle-slider {
    position: relative;
    width: 48px;
    height: 24px;
    background: var(--gray-300);
    border-radius: 12px;
    transition: background 0.3s;
    flex-shrink: 0;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary);
}

.toggle-switch input:checked + .toggle-slider::after {
    transform: translateX(24px);
}

.toggle-switch input {
    display: none;
}

.toggle-label {
    font-size: 0.875rem;
    color: var(--gray-700);
}

.form-help {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* Notification animations */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Responsive preferences sidebar */
@media (max-width: 480px) {
    .preferences-sidebar {
        width: 100%;
        right: -100%;
    }
    
    .range-inputs {
        flex-direction: column;
        align-items: stretch;
    }
    
    .range-inputs span {
        text-align: center;
    }
}


/* ============================================
   Autocomplete Components
   ============================================ */

.autocomplete-container {
    position: relative;
}

.autocomplete-input {
    width: 100%;
}

.autocomplete-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--gray-300);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    max-height: 250px;
    overflow-y: auto;
    z-index: 1001;
    display: none;
    box-shadow: var(--shadow-md);
}

.autocomplete-dropdown.show {
    display: block;
}

.dropdown-item {
    padding: 0.625rem 0.75rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--gray-100);
    transition: background var(--transition-fast);
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background: var(--gray-50);
}

.dropdown-item.selected {
    background: var(--gray-100);
}

.dropdown-item.disabled {
    color: var(--gray-400);
    cursor: default;
    font-style: italic;
}

.dropdown-item.disabled:hover {
    background: transparent;
}

.item-label {
    flex: 1;
    font-size: 0.875rem;
    color: var(--gray-800);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-count {
    font-size: 0.75rem;
    color: var(--gray-500);
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.item-check {
    color: var(--secondary);
    font-weight: 600;
}

/* Selected Tags */
.selected-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: 0.5rem;
    min-height: 28px;
}

.selected-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    max-width: 100%;
}

.selected-tag .tag-remove {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    margin-left: 0.25rem;
    font-size: 1rem;
    line-height: 1;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.selected-tag .tag-remove:hover {
    opacity: 1;
}

.no-selection {
    font-size: 0.75rem;
    color: var(--gray-400);
    font-style: italic;
}


/* ============================================
   Save Case Button
   ============================================ */

.save-case-container {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--gray-100);
}

.save-case-btn {
    background: transparent;
    border: none;
    color: var(--gray-400);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.save-case-btn:hover {
    color: var(--gray-600);
    background: var(--gray-50);
}

.save-case-btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.save-case-btn.saved {
    color: var(--secondary);
}

.save-case-btn.saved:hover {
    color: var(--secondary-dark);
}

.save-case-icon {
    display: none;
}

/* ============================================
   Case Alert Toggle
   ============================================ */

.case-alert-toggle {
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
}

.alert-toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--gray-600);
}

.alert-toggle-label:hover {
    color: var(--gray-700);
}

.alert-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
}

.alert-toggle-text {
    transition: color 0.2s ease;
}

/* ============================================
   Conversation Mode Indicator
   ============================================ */

.conversation-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.conversation-indicator .btn {
    font-size: 0.8rem;
    padding: 0.375rem 1rem;
    color: var(--gray-500);
    border-color: var(--gray-300);
    background: transparent;
}

.conversation-indicator .btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-light, rgba(59, 130, 246, 0.05));
}

/* ============================================
   Suggested Follow-up Questions
   ============================================ */

.suggested-followups {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--gray-100);
}

.followups-label {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: var(--spacing-xs);
}

.followups-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.followup-btn {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    color: var(--gray-700);
    font-size: 0.8rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
    max-width: 100%;
}

.followup-btn:hover {
    background: var(--primary-light, rgba(59, 130, 246, 0.1));
    border-color: var(--primary);
    color: var(--primary);
}

.followup-nav {
    border-color: var(--secondary, #10b981);
    color: var(--secondary, #10b981);
}

.followup-nav::after {
    content: " \2192";
}

.followup-nav:hover {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--secondary, #10b981);
    color: var(--secondary, #10b981);
}

/* ============================================
   Chart Artifact Styles
   ============================================ */

.chart-artifact {
    margin: 1rem 0;
    padding: 1rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.chart-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    text-align: center;
}

.chart-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    height: 280px;
}

.chart-container canvas {
    max-height: 100%;
}

.chart-source {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-align: center;
    margin-top: 0.75rem;
    font-style: italic;
}

/* Responsive chart sizing */
@media (max-width: 768px) {
    .chart-container {
        max-width: 100%;
        height: 220px;
    }
}


/* ============================================
   Treatment Comparison Page Styles
   ============================================ */

.example-queries {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.example-label {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.example-query-btn {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    color: var(--gray-600);
    font-size: 0.8rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.example-query-btn:hover {
    background: var(--primary-light, rgba(225, 29, 72, 0.1));
    border-color: var(--primary);
    color: var(--primary);
}

.comparison-results {
    margin-top: 2rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-header h2 {
    margin: 0;
}

.comparison-summary-section,
.comparison-charts-section,
.comparison-analysis-section,
.comparison-sources-section {
    margin-bottom: 1.5rem;
}

/* Study Breakdown (Treatment Comparison) */
.study-breakdown-toggle {
    display: flex;
    align-items: center;
    width: 100%;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    gap: 0.75rem;
    text-align: left;
    color: var(--gray-900);
}

.study-breakdown-toggle:hover .study-breakdown-title {
    color: var(--primary);
}

.study-breakdown-title {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.4;
    transition: color var(--transition-base);
}

.study-breakdown-meta {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.2rem;
    line-height: 1.3;
}

.study-breakdown-arrow {
    font-size: 0.7rem;
    color: var(--gray-400);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.study-breakdown-body {
    border-top: 1px solid var(--gray-100);
    padding-top: 0.75rem;
}

.study-chunk-section {
    margin-bottom: 0.75rem;
}

.study-chunk-section-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 0.35rem;
}

.study-chunk-text {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gray-50);
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.4rem;
    border-left: 3px solid var(--gray-200);
}

.study-chunks-container {
    max-height: 500px;
    overflow-y: auto;
}

/* Structured Profile Sections (Treatment Comparison) */
.study-profile-sections {
    max-height: 600px;
    overflow-y: auto;
}

.profile-section {
    margin-bottom: 0.75rem;
}

.profile-section-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 0.35rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--gray-100);
}

.profile-item {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gray-50);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.35rem;
    border-left: 3px solid var(--primary-light, var(--primary));
}

.profile-item strong {
    color: var(--gray-900);
}

.profile-evidence-quote {
    font-size: 0.78rem;
    color: var(--gray-500);
    font-style: italic;
    margin-top: 0.3rem;
    padding-left: 0.5rem;
    border-left: 2px solid var(--gray-200);
    line-height: 1.4;
}

.comparison-context {
    background: var(--blue-50, #eff6ff);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--blue-700, #1d4ed8);
    border-left: 3px solid var(--blue-500, #3b82f6);
}

.comparison-query {
    background: var(--gray-50);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--gray-700);
}

.comparison-answer {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-800);
}

.analysis-content {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--gray-700);
}

.sources-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.source-item {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-100);
}

.source-number {
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.source-content {
    flex: 1;
    min-width: 0;
}

.source-title {
    font-weight: 600;
    color: var(--gray-900);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.source-meta {
    font-size: 0.8rem;
    color: var(--gray-500);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.source-doi {
    font-size: 0.8rem;
    color: var(--primary);
    text-decoration: none;
    display: inline-block;
    margin-top: 0.25rem;
}

.source-doi:hover {
    text-decoration: underline;
}

/* ============================================
   Relevance & Source Type Badges (Tasks 4 + 9)
   ============================================ */

.relevance-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 10px;
    margin-left: 6px;
    vertical-align: middle;
}
.relevance-high { background: #d1fae5; color: #065f46; }
.relevance-medium { background: #fef3c7; color: #92400e; }
.relevance-low { background: #f3f4f6; color: #6b7280; }

.source-type-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 10px;
    margin-left: 4px;
    vertical-align: middle;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.source-type-pubmed { background: #dbeafe; color: #1e40af; }
.source-type-clinicaltrials { background: #ccfbf1; color: #0f766e; }

/* ============================================
   Structured Summary Card (Task 2)
   ============================================ */

.structured-summary-card {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.structured-summary-card .summary-header {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.evidence-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.evidence-high    { background: #d1fae5; color: #065f46; }
.evidence-moderate { background: #fef3c7; color: #92400e; }
.evidence-low     { background: #fee2e2; color: #991b1b; }
.evidence-insufficient { background: #f3f4f6; color: #6b7280; }
.rec-strength {
    font-size: 0.72rem;
    font-weight: 600;
    color: #0369a1;
    background: #e0f2fe;
    padding: 2px 7px;
    border-radius: 10px;
}
.key-finding {
    font-size: 0.9rem;
    font-weight: 500;
    color: #0c4a6e;
    margin: 4px 0 0;
    line-height: 1.45;
}
.summary-caveats {
    font-size: 0.8rem;
    color: #6b7280;
    font-style: italic;
    margin: 0;
}

/* ============================================
   Confidence Badge (Task 4)
   ============================================ */

.confidence-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    background: #ede9fe;
    color: #4c1d95;
    margin-left: 8px;
    vertical-align: middle;
}

/* ============================================
   Guideline Alignment Card (Task 5)
   ============================================ */

.guideline-alignment-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 10px 14px;
    margin-bottom: 12px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.guideline-alignment-card .alignment-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    line-height: 1.4;
}
.guideline-alignment-card .alignment-body {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.guideline-alignment-card .alignment-label {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.alignment-consistent   { color: #065f46; }
.alignment-inconsistent { color: #991b1b; }
.alignment-not-addressed { color: #6b7280; }
.guideline-alignment-card .alignment-note {
    font-size: 0.82rem;
    color: #475569;
    margin: 0;
}

/* ============================================
   Trial Abstract Container (Task 7)
   ============================================ */

.trial-abstract-container {
    margin-top: 10px;
    padding: 12px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 0.85rem;
    color: #374151;
    line-height: 1.5;
}
.trial-abstract-container .abstract-label {
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: #6b7280;
    margin-bottom: 6px;
    letter-spacing: 0.05em;
}
.read-abstract-btn {
    font-size: 0.75rem;
    padding: 4px 10px;
    margin-left: 6px;
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 6px;
    color: #0369a1;
    cursor: pointer;
    transition: background 0.15s;
}
.read-abstract-btn:hover { background: #e0f2fe; }

/* ============================================
   Trial Mode Selector (Task 8)
   ============================================ */

.trial-mode-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 10px 0;
    padding: 10px 14px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.85rem;
    color: #374151;
    flex-wrap: wrap;
}
.trial-mode-selector .selector-label {
    font-weight: 600;
    margin-right: 4px;
}
.trial-mode-btn {
    padding: 5px 14px;
    border-radius: 20px;
    border: 1px solid #cbd5e1;
    background: white;
    color: #475569;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}
.trial-mode-btn.selected {
    background: #0ea5e9;
    border-color: #0ea5e9;
    color: white;
}
.trial-mode-btn:hover:not(.selected) { background: #f1f5f9; }
.trial-mode-go-btn {
    padding: 5px 16px;
    border-radius: 20px;
    border: none;
    background: #0ea5e9;
    color: white;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
    margin-left: 4px;
}
.trial-mode-go-btn:hover { background: #0284c7; }

/* Loading state */
.comparison-summary-section .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 3rem;
    color: var(--gray-500);
}

.comparison-summary-section .spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}


/* Charts Grid for Treatment Comparison */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.charts-grid .chart-artifact {
    margin: 0;
}

.charts-grid .chart-container {
    height: 250px;
    max-width: 100%;
}

@media (max-width: 768px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-grid .chart-container {
        height: 200px;
    }
}

/* ============================================
   "How to use" Explainer Button & Panel
   ============================================ */

.btn-how-to-use {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
    border: none;
    padding: 0.2rem 0.5rem;
    font-size: 0.82rem;
    color: var(--gray-400);
    cursor: pointer;
    transition: color var(--transition-fast);
    letter-spacing: 0.01em;
}

.btn-how-to-use::before {
    content: "?";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.05rem;
    height: 1.05rem;
    border-radius: 50%;
    border: 1px solid var(--gray-300);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--gray-400);
    flex-shrink: 0;
}

.btn-how-to-use:hover {
    color: var(--gray-600);
}

.btn-how-to-use:hover::before {
    border-color: var(--gray-400);
    color: var(--gray-500);
}

.how-to-use-panel {
    text-align: left;
    max-width: 640px;
    margin: 0.75rem auto 0;
    padding: 1rem 1.25rem;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.88rem;
    color: var(--gray-600);
    line-height: 1.7;
}

.how-to-use-panel p {
    margin-bottom: 0.5rem;
    color: var(--gray-600);
}

.how-to-use-panel ol {
    margin: 0;
    padding-left: 1.25rem;
}

.how-to-use-panel ol li {
    margin-bottom: 0.35rem;
}

/* ============================================
   Collapsible Advanced Fields (Trial Finder)
   ============================================ */

.advanced-fields-toggle {
    margin-top: 0.5rem;
}

.advanced-fields-toggle > summary {
    list-style: none;
    user-select: none;
}

.advanced-fields-toggle > summary::-webkit-details-marker {
    display: none;
}

.advanced-fields-toggle > summary .toggle-arrow {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.advanced-fields-toggle[open] > summary .toggle-arrow {
    transform: rotate(90deg);
}


/* ============================================
   MATCH CRITERIA SIDEBAR (Patient Matching)
   ============================================ */

.match-criteria-sidebar {
    position: fixed;
    right: -420px;
    top: 0;
    width: 420px;
    height: 100vh;
    background: white;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.match-criteria-sidebar.open {
    right: 0;
}

.match-criteria-status {
    font-size: 0.75rem;
    color: var(--gray-500);
    transition: color 0.2s;
}

.match-criteria-status.active {
    color: var(--primary);
    font-weight: 600;
}

/* Category header checkbox row */
.criteria-category-toggle {
    font-weight: 600;
    padding: 0.5rem 0 0.25rem;
}

.criteria-category-toggle span {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Subfields container - indented under category */
.criteria-subfields {
    margin-left: 1.75rem;
    padding: 0.5rem 0 0.25rem;
    border-left: 2px solid var(--gray-200);
    padding-left: 1rem;
}

/* Slider items inside subfields */
.criteria-slider-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    margin-bottom: 0.75rem;
}

.criteria-slider-item:last-child {
    margin-bottom: 0;
}

.criteria-slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.criteria-slider-header label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-700);
}

.criteria-slider-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    min-width: 2.5rem;
    text-align: right;
}

.criteria-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    border-radius: 3px;
    background: var(--gray-200);
    outline: none;
    transition: background 0.2s;
}

.criteria-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 0.15s;
}

.criteria-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.criteria-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Biomarker mode radios */
.criteria-biomarker-mode {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.criteria-biomarker-mode .filter-checkbox {
    padding: 0.35rem 0;
}

.criteria-biomarker-mode input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}

/* Responsive match criteria sidebar */
@media (max-width: 480px) {
    .match-criteria-sidebar {
        width: 100%;
        right: -100%;
    }
}

/* ============================================
   In-Chat Module Actions
   ============================================ */

.module-actions-container {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
}

.module-actions-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.75rem;
}

.module-actions-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.module-action-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--gray-50);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.module-action-btn:hover:not(:disabled) {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.module-action-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.module-action-btn.loading {
    background: var(--gray-100);
    color: var(--gray-500);
}

/* Module Result Sections */
.module-result .message-content {
    max-width: 85%;
}

.module-result-content {
    color: var(--gray-700);
    line-height: 1.6;
}

.module-section {
    margin-bottom: 1.25rem;
}

.module-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.module-summary {
    background: var(--gray-50);
    padding: 1rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
}

.module-analysis {
    font-size: 0.9rem;
    line-height: 1.7;
}

/* Analytics Stats Grid */
.analytics-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.75rem;
}

.stat-item {
    background: var(--gray-50);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-item .stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-item .stat-label {
    font-size: 0.7rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Match Items (Patient Matching) */
.module-matches {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.match-item {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 0.875rem;
}

.match-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.match-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-800);
    flex: 1;
}

.match-score {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--primary);
    white-space: nowrap;
}

.match-meta {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.match-reasons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.5rem;
}

.match-tag {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    background: var(--gray-200);
    color: var(--gray-700);
    border-radius: 9999px;
}

.match-actions {
    margin-top: 0.5rem;
}

/* Trial Items (Trial Finder) */
.module-trials {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.trial-item {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 0.875rem;
}

.trial-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.trial-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-800);
    flex: 1;
}

.trial-score {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--secondary);
    white-space: nowrap;
}

.trial-meta {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.trial-details {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.trial-details div {
    margin-bottom: 0.25rem;
}

.trial-summary {
    font-size: 0.85rem;
    color: var(--gray-600);
    background: white;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
}

.trial-actions {
    margin-top: 0.5rem;
}

/* Study Comparison Items */
.study-comparison-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.study-comparison-item {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 0.875rem;
}

.study-comparison-header {
    margin-bottom: 0.5rem;
}

.study-comparison-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-800);
}

.study-comparison-meta {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.study-comparison-actions {
    margin-top: 0.5rem;
}

.query-interpretation {
    font-size: 0.85rem;
    color: var(--gray-600);
    background: var(--gray-50);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
}

.comparison-narrative {
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.6;
}

.comparison-categories {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.comparison-category {
    background: var(--gray-50);
    border-radius: var(--radius-md);
    padding: 0.75rem;
}

.comparison-category .category-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.comparison-category .comparison-table {
    width: 100%;
    font-size: 0.8rem;
    border-collapse: collapse;
}

.comparison-category .comparison-table th,
.comparison-category .comparison-table td {
    padding: 0.4rem 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.comparison-category .comparison-table th {
    font-weight: 600;
    color: var(--gray-600);
    background: var(--gray-100);
}

.comparison-category .comparison-table td {
    color: var(--gray-700);
}

/* Chart containers in modules */
.module-charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.chart-item {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 0.75rem;
}

.chart-item .chart-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.chart-canvas-wrap {
    position: relative;
    height: 200px;
}

.analytics-chart-container {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    height: 250px;
}

/* Extracted profile details */
.extracted-profile-details {
    margin-bottom: 0.5rem;
}

.extracted-profile-details summary {
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
}

.extracted-profile-content {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.profile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.5rem;
    font-size: 0.85rem;
}

.profile-grid div {
    color: var(--gray-700);
}

.profile-grid strong {
    color: var(--gray-600);
}

/* ============================================
   Left Side Navigation Panel
   ============================================ */

.side-nav-panel {
    position: fixed;
    left: 0;
    top: 80px; /* Will be adjusted dynamically by JS */
    width: 220px;
    background: linear-gradient(180deg, #ffffff 0%, #fafafa 100%);
    border-right: 1px solid var(--gray-200);
    z-index: 99;
    display: flex;
    flex-direction: column;
    transition: width var(--transition-base);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.03);
    /* Height set dynamically by JS to avoid footer */
    height: calc(100vh - 80px);
    overflow-y: auto;
}

.side-nav-panel.collapsed {
    width: 56px;
}

.side-nav-panel.collapsed .side-nav-text,
.side-nav-panel.collapsed .side-nav-section-title {
    opacity: 0;
    visibility: hidden;
    width: 0;
}

.side-nav-panel.collapsed .side-nav-link,
.side-nav-panel.collapsed .side-nav-btn {
    justify-content: center;
    padding: 0.75rem;
}

.side-nav-panel.collapsed .side-nav-header {
    justify-content: center;
    padding: 0.75rem;
}

.side-nav-panel.collapsed .side-nav-title {
    display: none;
}

.side-nav-header {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.875rem;
    border-bottom: 1px solid var(--gray-100);
    min-height: 52px;
    background: white;
}

.side-nav-title {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--gray-800);
}

.side-nav-toggle {
    background: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    padding: 0.2rem;
    color: var(--gray-400);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
    flex-shrink: 0;
}

.side-nav-toggle:hover {
    color: var(--gray-700);
}

.toggle-icon-nav {
    display: inline-block;
    transition: transform var(--transition-base);
    font-size: 1rem;
    line-height: 1;
}

.side-nav-panel.collapsed .toggle-icon-nav,
.side-nav-panel.collapsed .toggle-icon-svg {
    transform: rotate(180deg);
}

.side-nav-content {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.side-nav-section {
    margin-bottom: 0.5rem;
    padding: 0 0.5rem;
}

.side-nav-section-title {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.75rem 0.75rem 0.5rem;
    transition: opacity var(--transition-fast);
}

.side-nav-link,
.side-nav-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    border-radius: var(--radius-md);
    margin-bottom: 2px;
}

.side-nav-link:hover,
.side-nav-btn:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-900);
}

.side-nav-link.active {
    background: rgba(225, 29, 72, 0.1);
    color: var(--primary);
}

.side-nav-link.active .side-nav-icon-svg {
    stroke: var(--primary);
}

.side-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.side-nav-icon {
    font-size: 0.75rem;
    font-weight: 700;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    color: var(--gray-600);
}

.side-nav-link.active .side-nav-icon {
    background: rgba(225, 29, 72, 0.15);
    color: var(--primary);
}

.side-nav-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity var(--transition-fast), width var(--transition-fast);
}

/* Adjust main content when side nav is present */
body:has(.side-nav-panel) .header {
    padding-left: 0; /* Header stays full width above side nav */
}

body:has(.side-nav-panel.collapsed) .header {
    padding-left: 0;
}

body:has(.side-nav-panel) .section {
    padding-left: 220px;
    transition: padding-left var(--transition-base);
}

body:has(.side-nav-panel.collapsed) .section {
    padding-left: 56px;
}

body:has(.side-nav-panel) .footer {
    padding-left: 0; /* Footer stays full width below side nav */
}

body:has(.side-nav-panel.collapsed) .footer {
    padding-left: 0;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .side-nav-panel {
        transform: translateX(-100%);
        width: 260px;
        top: 80px;
        height: calc(100vh - 80px - 80px);
    }
    
    .side-nav-panel.mobile-open {
        transform: translateX(0);
    }
    
    body:has(.side-nav-panel) .header,
    body:has(.side-nav-panel) .section,
    body:has(.side-nav-panel) .footer {
        padding-left: 0;
    }
}


/* ============================================
   Treatment Evaluation Flow
   ============================================ */

.treatment-eval-prompt {
    padding: 0.5rem 0;
}

.treatment-eval-prompt p {
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--gray-700);
}

.treatment-eval-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.treatment-eval-btn {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    background: var(--gray-50);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.treatment-eval-btn:hover:not(:disabled) {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.treatment-eval-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.treatment-eval-btn.loading {
    background: var(--gray-100);
    color: var(--gray-500);
}

/* Treatment Input Form */
.treatment-input-form {
    padding: 0.5rem 0;
}

.treatment-input-form p {
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--gray-700);
}

.treatment-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.treatment-input-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.treatment-input-row label {
    min-width: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-600);
}

.treatment-input-row .treatment-input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    background: white;
    transition: border-color var(--transition-fast);
}

.treatment-input-row .treatment-input:focus {
    outline: none;
    border-color: var(--primary);
}

.add-treatment-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    background: transparent;
    border: 1px dashed var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-500);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 0.75rem;
}

.add-treatment-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.treatment-form-actions {
    margin-top: 1rem;
}

.treatment-form-actions .compare-btn {
    padding: 0.6rem 1.25rem;
}

.validation-message {
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    color: var(--danger);
    background: #fef2f2;
    border-radius: var(--radius-md);
}


/* Treatment Arms Grid */
.treatment-arms-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.treatment-arm-card {
    flex: 1;
    min-width: 120px;
    max-width: 200px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    text-align: center;
}

.treatment-arm-card .arm-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.treatment-arm-card .arm-count {
    font-size: 0.8rem;
    color: var(--gray-500);
}

/* Arm Details Collapsible */
.arm-details,
.analysis-details {
    margin-top: 0.5rem;
}

.arm-details summary,
.analysis-details summary {
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--gray-700);
    padding: 0.5rem 0;
}

.arm-details summary:hover,
.analysis-details summary:hover {
    color: var(--primary);
}

.arm-details-content {
    padding: 0.75rem 0;
}

.arm-section {
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--gray-200);
}

.arm-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.arm-section-header {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.arm-study-item {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--gray-100);
}

.arm-study-item:last-child {
    border-bottom: none;
}

.arm-study-title {
    font-size: 0.85rem;
    color: var(--gray-800);
}

.arm-study-meta {
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Comparison Query Display */
.comparison-query {
    background: var(--gray-50);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--gray-700);
}


/* Continue Research Section */
.continue-research-section {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
    text-align: center;
}

.continue-research-label {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.continue-research-buttons {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.continue-research-buttons .continue-btn {
    font-size: 0.85rem;
}

/* New Conversation Divider */
.new-conversation-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1rem 0;
    color: var(--gray-400);
    font-size: 0.85rem;
}

.new-conversation-divider span {
    padding: 0 1rem;
}

.new-conversation-btn {
    color: var(--gray-500);
    border-color: var(--gray-300);
}

.new-conversation-btn:hover {
    color: var(--gray-700);
    border-color: var(--gray-400);
}

/* Exit Conversation Modal */
.exit-conversation-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exit-conversation-modal {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    max-width: 420px;
    width: 90%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.exit-modal-header p {
    margin: 0 0 1.25rem 0;
    font-size: 1rem;
    color: var(--gray-800);
    line-height: 1.5;
}

.exit-modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.exit-modal-buttons .btn {
    width: 100%;
    justify-content: center;
}

.exit-modal-buttons .loading {
    padding: 1rem;
}


/* Arm Study Item with Actions */
.arm-study-item {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--gray-100);
}

.arm-study-item:last-child {
    border-bottom: none;
}

.arm-study-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.5rem;
}

.arm-study-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.arm-study-actions .study-details-btn {
    position: static;
    transform: none;
    opacity: 1;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}

.arm-study-actions .btn-sm {
    padding: 0.25rem 0.5rem;
}

/* Match actions in patient matching results */
.match-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.match-actions .study-details-btn {
    position: static;
    transform: none;
    opacity: 1;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}


/* Study Review Form */
.study-review-form {
    padding: 0.5rem 0;
}

.study-review-form > p {
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--gray-700);
}

.study-review-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.study-review-item {
    padding: 0.5rem 0.75rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
}

.study-review-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
}

.study-review-checkbox input[type="checkbox"] {
    margin-top: 0.25rem;
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.study-review-title {
    font-size: 0.9rem;
    color: var(--gray-800);
    line-height: 1.4;
}

.study-review-hint {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.study-review-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.compared-studies-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.compared-study {
    font-size: 0.9rem;
    color: var(--gray-700);
    padding: 0.25rem 0;
}

/* ============================================
   In-Chat Comparison Charts
   ============================================ */

.comparison-categories {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.comparison-category {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 1rem;
}

.category-name {
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.category-charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.chart-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 0.75rem;
}

.chart-card-title {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.chart-container {
    position: relative;
    height: 200px;
}

.category-summary {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--gray-200);
}

.no-data-message {
    text-align: center;
    color: var(--gray-500);
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

/* Comparison narrative styling */
.comparison-narrative {
    line-height: 1.7;
    color: var(--gray-700);
}

.comparison-narrative p {
    margin-bottom: 0.75rem;
}

.comparison-narrative strong {
    color: var(--gray-800);
}


/* Study Selection Modal */
.study-selection-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.study-selection-modal {
    background: #fff;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.study-selection-modal .modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--gray-200);
}

.study-selection-modal .modal-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.study-selection-modal .modal-close-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--gray-500);
    padding: 0.25rem 0.5rem;
    line-height: 1;
}

.study-selection-modal .modal-close-btn:hover {
    color: var(--gray-700);
}

.study-selection-modal .modal-body {
    padding: 1rem 1.25rem;
    overflow-y: auto;
    flex: 1;
}

.study-selection-modal .modal-subtitle {
    margin: 0 0 0.75rem 0;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.study-selection-modal .modal-study-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.study-selection-modal .modal-study-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: 8px;
    gap: 0.75rem;
}

.study-selection-modal .modal-study-info {
    flex: 1;
    min-width: 0;
}

.study-selection-modal .modal-study-title {
    font-size: 0.875rem;
    color: var(--gray-800);
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.study-selection-modal .modal-empty-message {
    text-align: center;
    color: var(--gray-500);
    font-style: italic;
    padding: 1.5rem;
}

.study-selection-modal .modal-footer {
    display: flex;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--gray-200);
    gap: 0.75rem;
}

/* Study Review Form Styles */
.study-review-form {
    padding: 0.5rem 0;
}

.study-review-list {
    margin: 0.75rem 0;
}

.study-review-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--gray-50);
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.study-review-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    cursor: pointer;
}

.study-review-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.study-review-title {
    font-size: 0.875rem;
    color: var(--gray-800);
}

.btn-remove-study {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    font-size: 1rem;
    padding: 0.25rem 0.5rem;
    line-height: 1;
}

.btn-remove-study:hover {
    color: var(--danger);
}

.study-review-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}