/* =============================================================================
   GRAPHOS - Academic Platform for Geology & Mining
   Premium Design System
   ============================================================================= */

/* CSS Variables - Design Tokens */
:root {
    /* Colors - Dark Theme with Geological Accents */
    --color-bg-primary: #0a0e17;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1a2234;
    --color-bg-card: #1e293b;
    --color-bg-elevated: #243044;

    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #06b6d4;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Geological palette */
    --color-geo-copper: #b87333;
    --color-geo-gold: #ffd700;
    --color-geo-iron: #8b4513;
    --color-geo-quartz: #e6e6fa;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-geo: linear-gradient(135deg, #b87333 0%, #ffd700 100%);
    --gradient-dark: linear-gradient(180deg, #0a0e17 0%, #111827 100%);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;

    /* Borders & Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    --border-subtle: 1px solid rgba(255, 255, 255, 0.08);
    --border-light: 1px solid rgba(255, 255, 255, 0.12);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--gradient-dark);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================================================
   Navigation
   ============================================================================= */

.nav-main {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: var(--border-subtle);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.brand-icon svg {
    width: 20px;
    height: 20px;
}

.brand-name {
    font-size: var(--text-xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-tagline {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-left: var(--space-sm);
    padding-left: var(--space-sm);
    border-left: 1px solid var(--color-text-muted);
}

.nav-menu {
    display: flex;
    gap: var(--space-xs);
}

.nav-link {
    background: none;
    border: none;
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--color-accent-primary);
    background: rgba(59, 130, 246, 0.1);
}

.role-selector {
    background: var(--color-bg-tertiary);
    border: var(--border-light);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    padding: var(--space-sm) var(--space-md);
    font-family: inherit;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.role-selector:hover {
    border-color: var(--color-accent-primary);
}

.role-selector:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* =============================================================================
   Main Content
   ============================================================================= */

.main-content {
    padding-top: 64px;
    min-height: 100vh;
}

.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =============================================================================
   Hero Section
   ============================================================================= */

.hero-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-3xl) var(--space-xl);
    min-height: calc(100vh - 200px);
    align-items: center;
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.gradient-text {
    background: var(--gradient-geo);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 540px;
}

.hero-subtitle strong {
    color: var(--color-accent-tertiary);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* Hero Visual - Knowledge Graph Animation */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-graphic {
    position: relative;
    width: 400px;
    height: 400px;
}

.node {
    position: absolute;
    background: var(--color-bg-card);
    border: 2px solid var(--color-accent-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--text-sm);
    box-shadow: var(--shadow-glow);
    animation: pulse 3s ease-in-out infinite;
}

.node-central {
    width: 100px;
    height: 100px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--gradient-primary);
    color: white;
    font-size: var(--text-xl);
    z-index: 10;
}

.node-1 {
    width: 70px;
    height: 70px;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 0.2s;
}

.node-2 {
    width: 70px;
    height: 70px;
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
    animation-delay: 0.4s;
}

.node-3 {
    width: 70px;
    height: 70px;
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 0.6s;
}

.node-4 {
    width: 70px;
    height: 70px;
    top: 50%;
    left: 5%;
    transform: translateY(-50%);
    animation-delay: 0.8s;
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 1px dashed rgba(59, 130, 246, 0.3);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 250px;
    height: 250px;
}

.orbit-2 {
    width: 350px;
    height: 350px;
    animation-direction: reverse;
}

@keyframes pulse {

    0%,
    100% {
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        transform: translate(-50%, -50%) scale(1.05);
    }
}

.node-1 {
    animation: pulse 3s ease-in-out infinite 0.2s;
    transform: translateX(-50%) scale(1);
}

.node-1:hover,
.node-2:hover,
.node-3:hover,
.node-4:hover {
    transform: scale(1.1);
}

@keyframes rotate {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }

    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* =============================================================================
   Features Section
   ============================================================================= */

.features-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-3xl) var(--space-xl);
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    background: var(--color-bg-card);
    border: var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.icon-trace {
    background: rgba(59, 130, 246, 0.15);
    color: var(--color-accent-primary);
}

.icon-facts {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

.icon-uncertain {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-warning);
}

.icon-multimodal {
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-accent-secondary);
}

.feature-card h3 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* =============================================================================
   Quick Actions (Role-based)
   ============================================================================= */

.quick-actions-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
}

.role-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-md);
}

.action-card {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-card) 100%);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.action-card:hover {
    border-color: var(--color-accent-primary);
    transform: translateX(4px);
}

.action-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.action-icon svg {
    width: 22px;
    height: 22px;
}

.action-content h4 {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.action-content p {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* =============================================================================
   Principles Banner
   ============================================================================= */

.principles-banner {
    max-width: 1400px;
    margin: var(--space-2xl) auto;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.principle {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.principle-icon {
    font-size: var(--text-xl);
}

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

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

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: var(--border-light);
}

.btn-secondary:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-accent-primary);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-base);
}

.btn-lg svg {
    width: 20px;
    height: 20px;
}

.btn-icon {
    background: none;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.link-btn {
    background: none;
    border: none;
    color: var(--color-accent-primary);
    cursor: pointer;
    text-decoration: underline;
    font-family: inherit;
    font-size: inherit;
}

/* =============================================================================
   Query View
   ============================================================================= */

.query-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    height: calc(100vh - 64px);
}

.query-sidebar {
    background: var(--color-bg-secondary);
    border-right: var(--border-subtle);
    padding: var(--space-lg);
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: var(--space-xl);
}

.sidebar-section h3 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.query-type-selector {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.query-type {
    background: none;
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: inherit;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.query-type svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.query-type:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-text-primary);
}

.query-type.active {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

.filter-input {
    width: 100%;
    background: var(--color-bg-tertiary);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--text-sm);
    margin-bottom: var(--space-sm);
}

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

.doc-list {
    max-height: 200px;
    overflow-y: auto;
}

.doc-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) 0;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.doc-item input[type="checkbox"] {
    accent-color: var(--color-accent-primary);
}

.history-list {
    font-size: var(--text-sm);
}

.empty-state {
    color: var(--color-text-muted);
    font-style: italic;
}

/* Query Main Area */
.query-main {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-primary);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl);
}

.chat-welcome {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
    max-width: 600px;
    margin: 0 auto;
}

.welcome-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
    color: white;
}

.welcome-icon svg {
    width: 32px;
    height: 32px;
}

.chat-welcome h2 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-sm);
}

.chat-welcome p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.example-queries {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.example-query {
    background: var(--color-bg-card);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    font-family: inherit;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.example-query:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-text-primary);
}

/* Chat Messages */
.chat-messages {
    display: none;
    flex-direction: column;
    gap: var(--space-lg);
}

.chat-messages.active {
    display: flex;
}

.message {
    max-width: 85%;
    animation: slideIn 0.3s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-user {
    align-self: flex-end;
}

.message-assistant {
    align-self: flex-start;
}

.message-content {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
}

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

.message-assistant .message-content {
    background: var(--color-bg-card);
    border: var(--border-subtle);
    border-bottom-left-radius: var(--radius-sm);
}

.message-meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.source-badge {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-accent-primary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
}

/* Query Input */
.query-input-container {
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-top: var(--border-subtle);
}

.input-wrapper {
    display: flex;
    gap: var(--space-sm);
    background: var(--color-bg-tertiary);
    border: var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-sm);
    align-items: flex-end;
}

.input-wrapper:focus-within {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#query-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--text-base);
    padding: var(--space-sm);
    resize: none;
    min-height: 24px;
    max-height: 150px;
}

#query-input:focus {
    outline: none;
}

#query-input::placeholder {
    color: var(--color-text-muted);
}

.input-actions {
    display: flex;
    gap: var(--space-xs);
}

.input-hint {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* =============================================================================
   Library View
   ============================================================================= */

.library-header {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl) var(--space-xl);
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, transparent 100%);
}

.library-header h1 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-sm);
}

.library-header p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.library-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--text-3xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.library-toolbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    gap: var(--space-md);
    align-items: center;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 250px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-bg-card);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
}

.search-box svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
}

.search-box input {
    flex: 1;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--text-sm);
}

.search-box input:focus {
    outline: none;
}

.filter-buttons {
    display: flex;
    gap: var(--space-xs);
}

.filter-btn {
    background: none;
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-family: inherit;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-text-primary);
}

.filter-btn.active {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
}

.library-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.empty-library {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-3xl);
    color: var(--color-text-muted);
}

.empty-library svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-library h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

.empty-library p {
    margin-bottom: var(--space-lg);
}

.doc-card {
    background: var(--color-bg-card);
    border: var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.doc-card:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.doc-type-badge {
    font-size: var(--text-xl);
}

.doc-status {
    font-size: var(--text-xs);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
}

.doc-card h3 {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.doc-card-meta {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.doc-card-stats {
    display: flex;
    gap: var(--space-md);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* =============================================================================
   Tools View
   ============================================================================= */

.tools-header {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl) var(--space-xl);
}

.tools-header h1 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-sm);
}

.tools-header p {
    color: var(--color-text-secondary);
}

.tools-grid {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl) var(--space-3xl);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.tool-card {
    background: var(--color-bg-card);
    border: var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    display: flex;
    gap: var(--space-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.tool-card:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tool-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.tool-icon svg {
    width: 28px;
    height: 28px;
}

.tool-content h3 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.tool-content p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.tool-badge {
    font-size: var(--text-xs);
    padding: 2px 10px;
    border-radius: var(--radius-full);
}

.badge-profesor {
    background: rgba(139, 92, 246, 0.2);
    color: var(--color-accent-secondary);
}

.badge-estudiante {
    background: rgba(6, 182, 212, 0.2);
    color: var(--color-accent-tertiary);
}

.badge-investigador {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-warning);
}

.badge-todos {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-accent-primary);
}

/* =============================================================================
   Modals
   ============================================================================= */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-bg-secondary);
    border: var(--border-light);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    animation: modalIn 0.3s ease;
}

.modal-lg {
    max-width: 800px;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: var(--border-subtle);
}

.modal-header h2 {
    font-size: var(--text-xl);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--color-text-muted);
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--color-text-primary);
}

.modal-body {
    padding: var(--space-lg);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-md);
    padding: var(--space-lg);
    border-top: var(--border-subtle);
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--color-text-muted);
    border-radius: var(--radius-lg);
    padding: var(--space-3xl);
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-accent-primary);
    background: rgba(59, 130, 246, 0.05);
}

.upload-zone svg {
    width: 48px;
    height: 48px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.upload-zone p {
    color: var(--color-text-secondary);
}

.upload-form {
    margin-top: var(--space-lg);
    display: none;
}

.upload-form.active {
    display: block;
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
    background: var(--color-bg-tertiary);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--text-sm);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-accent-primary);
}

.form-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-md);
}

/* =============================================================================
   Loading Overlay
   ============================================================================= */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 3000;
    background: rgba(10, 14, 23, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-overlay.hidden {
    display: none;
}

.loading-spinner {
    text-align: center;
}

.spinner-ring {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-bg-tertiary);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-md);
}

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

.loading-spinner p {
    color: var(--color-text-secondary);
}

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

@media (max-width: 1024px) {
    .hero-section {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .query-container {
        grid-template-columns: 1fr;
    }

    .query-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--space-md);
    }

    .nav-menu {
        display: none;
    }

    .brand-tagline {
        display: none;
    }

    .hero-title {
        font-size: var(--text-3xl);
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
    }

    .library-stats {
        gap: var(--space-xl);
    }

    .library-toolbar {
        flex-direction: column;
    }

    .search-box {
        width: 100%;
    }

    .filter-buttons {
        width: 100%;
        justify-content: center;
    }
}