@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Merriweather:wght@300;400;700;900&display=swap');

:root {
    /* Primary Palette */
    --color-primary-blue: #000435;
    --color-primary-medium-blue: #0A49B8;
    --color-primary-light-blue: #CEDBF1;
    --color-primary-dark-blue: #173470;

    /* Accent Colors */
    --color-accent-red: #ff383c;
    --color-accent-light-blue: #CEDBF1;

    /* Neutral Palette */
    --color-neutral-white: #ffffff;
    --color-neutral-light-gray: #f8f8f8;
    --color-neutral-medium-gray: #C9C9C9;
    --color-neutral-dark: #18181b;

    /* Semantic Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    /* App Theme Variables (Mapped to Palette) */
    --bg-color: var(--color-neutral-dark);      /* Dark Mode Background */
    --bg-secondary: #1E293B;  /* Surface */
    --chat-bg: #1E293B;
    
    --primary-color: #3B82F6; /* Brighter blue for dark mode accessibility */
    --primary-hover: #60A5FA;
    
    --text-color: #F8FAFC;    
    --text-secondary: #CBD5E1; /* Lighter gray for better contrast */
    
    --border-color: #334155;
    --accent-color: var(--color-accent-red);
    
    --font-family: 'Sora', system-ui, -apple-system, sans-serif;
    --font-serif: 'Sora', system-ui, -apple-system, sans-serif; /* Unifying fonts as per guide preference for sans */
    --font-mono: 'SF Mono', 'Roboto Mono', monospace;
    --base-font-size: 16px;
    
    --surface: #1E293B;
    --surface-hover: #334155;
    --border: #334155;
    --text: #F8FAFC;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
}

/* Light theme */
[data-theme="light"] {
    --bg-color: var(--color-neutral-light-gray);
    --bg-secondary: var(--color-neutral-white);
    --chat-bg: var(--color-primary-blue);       /* Header Background */
    
    --primary-color: var(--color-primary-blue);
    --primary-hover: var(--color-primary-medium-blue);
    
    --text-color: var(--color-neutral-dark);
    --text-secondary: #4B5563; /* Gray 600 */
    
    --border-color: var(--color-neutral-medium-gray);
    --accent-color: var(--color-accent-red);
    
    --surface: var(--color-neutral-white);
    --surface-hover: #F3F4F6; /* Gray 100 */
    --border: var(--color-neutral-medium-gray);
    --text: var(--color-neutral-dark);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: var(--font-family);
    font-size: var(--base-font-size);
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--chat-bg);
    backdrop-filter: none;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    font-family: var(--font-serif);
    color: var(--primary-color);
    letter-spacing: -0.03em;
    white-space: nowrap;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: transform 0.2s ease;
}

.logo:hover {
    transform: scale(1.02);
}

.logo i {
    color: var(--primary-color);
}

/* Light mode header overrides */
[data-theme="light"] .app-header {
    background: var(--chat-bg); /* Primary Blue */
    border-bottom: none;
}

[data-theme="light"] .logo {
    color: #FFFFFF;
}

[data-theme="light"] .logo i {
    color: var(--color-primary-light-blue); /* Light Blue Accent */
}

[data-theme="light"] .header-search input {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: #FFFFFF;
}

[data-theme="light"] .header-search input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

[data-theme="light"] .header-search button {
    color: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .icon-btn {
    color: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .icon-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #FFFFFF;
}

.header-search {
    flex: 1;
    max-width: 600px;
    position: relative;
}

.header-search input {
    width: 100%;
    padding: 0.875rem 3.5rem 0.875rem 3rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background-color: var(--surface);
    color: var(--text-color);
    font-size: 0.95rem;
    font-family: var(--font-family);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15), var(--shadow-md);
    transform: translateY(-1px);
}

.header-search button {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.header-search button:hover {
    color: var(--primary-color);
    background-color: var(--surface-hover);
    transform: translateY(-50%) scale(1.05);
}

.header-search button:active {
    transform: translateY(-50%) scale(0.95);
}

.search-bar {
    position: relative;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    width: 18px;
    height: 18px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.625rem;
    border-radius: 0.625rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--text-color);
    background-color: var(--surface-hover);
    transform: scale(1.05);
}

.icon-btn:active {
    transform: scale(0.95);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #22c55e;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Split View Layout */
.split-view-container {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    background-color: var(--bg-color);
}

.resizer {
    width: 4px;
    background-color: var(--border-color);
    cursor: col-resize;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10;
}

.resizer:hover, .resizer.active {
    background-color: var(--primary-color);
    width: 6px;
}

/* Sidebar */
.sidebar {
    width: 450px;
    min-width: 450px;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    background-color: var(--surface);
    display: flex;
    flex-direction: column;
}

.empty-sidebar-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
    opacity: 0.7;
}

.empty-sidebar-state i {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Sidebar Search Header */
.sidebar-search-header {
    padding: 0.875rem 1.25rem;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    border-top: 1px solid var(--border-color);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(10px);
}

.sidebar-search-header:first-child {
    border-top: none;
}

/* Sidebar Items */
.sidebar-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
    background: var(--surface);
}

.sidebar-item:hover {
    background: var(--surface-hover);
    box-shadow: var(--shadow-sm);
}

.sidebar-item.active {
    background: var(--surface-hover);
    border-left: 3px solid var(--primary-color);
    box-shadow: var(--shadow-md);
}

.sidebar-item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.sidebar-item-id {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-family: monospace;
}

.sidebar-item-title {
    font-family: var(--font-serif);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-color);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
}

.sidebar-item-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.2s ease;
}

/* Main Content (Detail View) */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    background-color: var(--bg-color);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    opacity: 0.5;
}

.empty-state i {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
}

/* Detail View Styles */
.detail-view {
    max-width: 850px;
    margin: 0 auto;
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.detail-header {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.25rem;
}

.detail-meta-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.detail-top-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.detail-id {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    background: var(--surface);
    padding: 0.35rem 0.75rem;
    border-radius: 0.35rem;
    border: 1px solid var(--border-color);
}

.detail-title {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-color);
    line-height: 1.3;
    margin-bottom: 1.25rem;
    letter-spacing: -0.02em;
}

.detail-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease;
}

.detail-meta-grid:hover {
    box-shadow: var(--shadow-md);
}

.detail-meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.detail-meta-item:first-child {
    grid-column: 1 / -1;
}

.detail-meta-full {
    grid-column: 1 / -1;
}

.detail-meta-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.05em;
}

.detail-meta-value {
    font-size: 0.875rem;
    color: var(--text-color);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.author-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.author-item {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    cursor: help;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    position: relative;
    white-space: nowrap;
}

.author-item:hover {
    background: var(--surface-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

/* Global Tooltip */
.global-tooltip {
    position: fixed;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    white-space: pre-wrap;
    max-width: 300px;
    z-index: 10000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    box-shadow: var(--shadow-lg);
    text-align: left;
}

/* Remove old CSS tooltip styles */
/* .author-item[data-organization]:hover::after ... */


/* Ensure parent containers don't clip the tooltip */
.detail-meta-value {
    overflow: visible;
}

.detail-meta-item {
    overflow: visible;
}

.detail-meta-grid {
    overflow: visible;
}

.detail-section {
    margin-top: 1.5rem;
}

.detail-section-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    letter-spacing: -0.01em;
}

.detail-text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-color);
    background: var(--surface);
    padding: 2rem;
    border-radius: 1rem;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease;
}

.detail-text.excerpt-highlight {
    background: rgba(239, 35, 60, 0.05);
    border-left-color: var(--primary-color);
}

[data-theme="light"] .detail-text.excerpt-highlight {
    background: rgba(217, 4, 41, 0.05);
}

.detail-text:hover {
    box-shadow: var(--shadow-md);
}

.detail-actions {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.875rem 1.75rem;
    border-radius: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--primary-color);
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: white;
    box-shadow: var(--shadow-sm);
    border: none;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

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

/* Search Separator */
.search-separator {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: 2rem 0;
    position: relative;
}

.search-separator::after {
    content: '•••';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-color);
    padding: 0 1rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Result Cards - Professional, Space-Efficient Layout */
.result-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.25rem;
    margin-top: 1rem;
    transition: all 0.2s;
}

.result-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.result-id {
    font-size: 0.8rem;
    color: var(--accent-color);
    font-family: monospace;
    font-weight: 600;
}

.abstract-id {
    font-size: 0.8rem;
    color: var(--accent-color);
    font-family: monospace;
    font-weight: 600;
}

.relevance-badge {
    padding: 0.375rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.relevance-badge:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.relevance-badge-small {
    padding: 0.25rem 0.5rem;
    border-radius: 0.5rem;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Color-coded badges matching gradient slider */
/* Color-coded badges matching gradient slider */
.badge-high {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.badge-medium {
    background-color: #ca8a04;
    color: #fff;
}

.badge-low {
    background-color: #ef4444;
    color: #fff;
}

/* Text colors matching badges - use text color for readability */
.text-high,
.text-medium,
.text-low {
    color: var(--text-color);
}

.result-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0 0 0.75rem 0;
    line-height: 1.4;
}

.result-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
    margin: 0.75rem 0;
    padding: 0.75rem;
    background-color: rgba(59, 130, 246, 0.05);
    border-radius: 0.375rem;
    border-left: 3px solid var(--primary-color);
}

.meta-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.meta-item i {
    width: 14px;
    height: 14px;
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 0.15rem;
}

.meta-item.category {
    grid-column: 1 / -1;
}

.excerpt-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0.75rem 0 0.25rem 0;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 0.75rem;
    background-color: rgba(255, 255, 255, 0.02);
    border-radius: 0.375rem;
    border-left: 2px solid var(--border-color);
}

.pdf-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}

.pdf-link:hover {
    color: var(--primary-hover);
    gap: 0.75rem;
}

.pdf-link i {
    width: 14px;
    height: 14px;
}

.result-score {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.source-link {
    display: inline-block;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--primary-color);
    text-decoration: none;
}

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

/* Input Area */
.input-area {
    padding: 2rem;
    background: linear-gradient(to top, var(--bg-color) 80%, transparent);
}

.input-container {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
}


input[type="text"] {
    width: 100%;
    padding: 1.25rem 3.5rem 1.25rem 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--chat-bg);
    color: var(--text-color);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.2s, box-shadow 0.2s;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

#send-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: color 0.2s, background-color 0.2s;
}

#send-btn:hover {
    color: var(--primary-color);
    background-color: rgba(255, 255, 255, 0.05);
}

#send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Settings / Debug Panel */
.settings-toggle {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    z-index: 100;
}

.settings-toggle:hover {
    background-color: var(--surface-hover);
    color: var(--text);
    transform: rotate(45deg);
}

.settings-panel {
    position: fixed;
    width: 500px;
    max-height: 600px;
    overflow-y: auto;
    background: linear-gradient(135deg, var(--chat-bg) 0%, var(--surface) 100%);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.75rem;
    z-index: 1000;
    box-shadow: var(--shadow-xl);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 1;
}

.settings-panel.hidden {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    pointer-events: none;
}

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

.settings-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-color);
    letter-spacing: -0.01em;
}

.settings-header button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
}

.setting-group {
    margin-bottom: 1.5rem;
}

.setting-group label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.threshold-explanation {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--surface);
    border-radius: 0.5rem;
    border-left: 3px solid var(--primary-color);
    font-size: 0.85rem;
    line-height: 1.6;
}

.threshold-explanation p {
    margin: 0 0 0.75rem 0;
}

.threshold-explanation ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.threshold-explanation li {
    margin: 0.5rem 0;
}

.threshold-explanation .tip {
    margin-top: 1rem;
    padding: 0.75rem;
    background-color: rgba(59, 130, 246, 0.1);
    border-radius: 0.375rem;
    font-size: 0.8rem;
}

/* PDF Modal Styles */
.pdf-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.pdf-modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.pdf-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

.pdf-modal-content {
    position: relative;
    width: 90%;
    height: 90%;
    background-color: var(--surface);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-xl);
    z-index: 2001;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.close-modal-btn {
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.close-modal-btn:hover {
    background-color: rgba(0, 0, 0, 0.9);
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-lg);
}

.pdf-modal-header {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 2002;
    display: flex;
    gap: 0.75rem;
}

.download-modal-btn {
    background-color: rgba(59, 130, 246, 0.8);
    color: white;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.download-modal-btn:hover {
    background-color: rgba(59, 130, 246, 1);
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.pdf-frame-container {
    width: 100%;
    height: 100%;
    background-color: #525659; /* Standard PDF viewer background */
}

.pdf-frame-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

input[type="range"] {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #22c55e 0%, #eab308 50%, #f97316 100%);
    border-radius: 5px;
    outline: none;
    margin: 0.75rem 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-color);
    cursor: pointer;
    border: 3px solid var(--bg-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-color);
    cursor: pointer;
    border: 3px solid var(--bg-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: -0.5rem;
    margin-bottom: 0.75rem;
}

.slider-labels span:first-child {
    color: #22c55e;
    font-weight: 600;
}

.slider-labels span:last-child {
    color: #f97316;
    font-weight: 600;
}

.log-viewer {
    background-color: #000;
    border: 1px solid var(--border);
    border-radius: 6px;
    height: 150px;
    overflow-y: auto;
    padding: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: #22c55e;
}

.log-entry {
    margin-bottom: 2px;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
    margin-right: 10px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface-hover);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: var(--text-secondary);
    transition: .4s;
}

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

input:checked + .slider:before {
    transform: translateX(26px);
    background-color: white;
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.label-text {
    margin-left: 60px;
    white-space: nowrap;
    font-size: 0.9rem;
    color: var(--text-color);
}

/* Collapsible Details */
details {
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden;
}

summary {
    padding: 1rem;
    cursor: pointer;
    background-color: var(--surface);
    font-weight: 600;
    color: var(--text-color);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: none;
}

details[open] summary::after {
    content: none;
}

details[open] summary {
    border-bottom: 1px solid var(--border-color);
}

/* Abstract preview specific styles */
.abstract-preview-details summary {
    margin-bottom: 0;
}

.abstract-preview-text {
    margin-top: 0.5rem;
}

/* Remove bottom spacing when details is closed */
details:not([open]) .abstract-preview-text {
    display: none;
    margin: 0;
    padding: 0;
}

/* PDF Embed */
.pdf-container {
    width: 100%;
    height: 800px;
    border: none;
    background-color: #f1f5f9;
}

.pdf-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 400px;
    background-color: var(--surface);
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
}

/* Low Relevance Hidden State */
.sidebar-item.low-relevance.hidden {
    display: none;
}

/* Focus States for Accessibility */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 0.25rem;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Snippet Styles */
.sidebar-item-snippet {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

mark {
    background-color: rgba(255, 215, 0, 0.3);
    color: inherit;
    padding: 0 2px;
    border-radius: 2px;
}

[data-theme="dark"] mark {
    background-color: rgba(255, 215, 0, 0.35);
    color: #fde047;
}

/* Collapsible Details Styles */
details.abstract-preview-details summary {
    outline: none;
}

details.abstract-preview-details summary::-webkit-details-marker {
    display: none;
}

details.abstract-preview-details[open] .chevron-icon {
    transform: rotate(180deg);
}

details.abstract-preview-details .chevron-icon {
    transition: transform 0.2s ease;
}

/* Tooltip Styles */
.author-item {
    position: relative;
}

.author-item[data-organization]:hover::after {
    content: attr(data-organization);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-secondary);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    white-space: pre-wrap;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    min-width: 200px;
    text-align: center;
}

/* Footer Styles */
.app-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1rem 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.app-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}


.app-footer a:hover {
    text-decoration: underline;
}

/* Share Button in Sidebar Header */
.icon-btn-small {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    margin-right: 0.5rem;
}

.icon-btn-small:hover {
    color: var(--primary-color);
    background-color: var(--surface-hover);
}

.icon-btn-small i {
    width: 16px;
    height: 16px;
}

.sidebar-search-header {
    display: flex;
    align-items: center;
}

/* Toast Notification */
.toast-notification {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background-color: var(--surface);
    color: var(--text-color);
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9rem;
    font-weight: 500;
    pointer-events: none;
}

.toast-notification.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Mobile Responsive Styles */
.mobile-back-btn {
    display: none; /* Hidden by default on desktop */
}

@media (max-width: 768px) {
    .split-view-container {
        position: relative;
    }

    .sidebar {
        width: 100%;
        min-width: 100%;
        border-right: none;
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        z-index: 10;
        transition: transform 0.3s ease;
    }

    .sidebar.hidden-mobile {
        transform: translateX(-100%);
    }

    .resizer {
        display: none;
    }

    .main-content {
        width: 100%;
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        z-index: 20;
        background: var(--bg-color);
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }

    .main-content.active-mobile {
        transform: translateX(0);
    }

    .mobile-back-btn {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        background: none;
        border: none;
        color: var(--primary-color);
        font-weight: 600;
        padding: 1rem 0;
        margin-bottom: 1rem;
        cursor: pointer;
        font-size: 1rem;
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .mobile-back-btn:hover {
        text-decoration: underline;
    }
    
    /* Adjust header for mobile */
    .app-header {
        padding: 1rem;
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .header-left {
        width: 100%;
        justify-content: center;
    }
    
    .header-search {
        order: 3;
        width: 100%;
        max-width: none;
    }
    
    .header-actions {
        position: absolute;
        top: 1rem;
        right: 1rem;
    }
    
    /* Adjust detail view padding */
    .detail-view {
        padding: 0;
    }
    
    .detail-text {
        padding: 1.25rem;
    }
}

/* Topic Snapshot */
.topic-snapshot {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0;
    font-size: 0.9rem;
}

.topic-snapshot-header {
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.topic-snapshot-header:hover {
    background-color: var(--surface-hover);
}

.snapshot-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sparkle-icon {
    width: 16px;
    height: 16px;
}

.snapshot-summary {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-left: auto;
    margin-right: 1rem;
}

.chevron-icon {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.topic-snapshot-content {
    padding: 0 1.25rem 1.25rem 1.25rem;
    border-top: 1px solid var(--border-color);
    background: var(--surface);
    animation: slideDown 0.2s ease-out;
}

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

.topic-snapshot-content.hidden {
    display: none;
}

.snapshot-grid {
    display: grid;
    grid-template-columns: 1fr; /* Force single column for better visibility */
    gap: 1rem;
    margin-top: 1rem;
}

/* Removed media query as it's now always 1 column */

.column-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
}

.snapshot-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.snapshot-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.5rem; /* Increased padding for better click target */
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
    cursor: pointer; /* Indicate interactivity */
    border-radius: 0.25rem;
    transition: background-color 0.2s ease;
}

.snapshot-list-item:hover {
    background-color: var(--surface-hover);
}

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

.item-name {
    color: var(--text-color);
    white-space: normal; /* Allow wrapping */
    word-break: break-word; /* Break long words if needed */
    overflow: visible;
    text-overflow: clip;
    max-width: 80%;
    line-height: 1.3;
}

.item-count {
    background: var(--bg-color);
    color: var(--text-secondary);
    padding: 0.1rem 0.4rem;
    border-radius: 1rem;
    font-size: 0.7rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
}