:root {
    --sepia-light: #f5f0e6;
    --sepia-medium: #e8dcc8;
    --sepia-dark: #5D4037;
    --gold-accent: #C9A227;
    --parchment: #faf6ed;
    --ink-dark: #2c1810;
    --ink-medium: #4a3728;
    --blue-accent: #1e3a5f;
}

.dark-theme {
    --sepia-light: #1a2f1a;
    --sepia-medium: #243524;
    --sepia-dark: #0f1a0f;
    --gold-accent: #d4af37;
    --parchment: #1e2d1e;
    --ink-dark: #e8dcc8;
    --ink-medium: #c4b69c;
    --blue-accent: #4a7c59;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Source Sans 3', sans-serif;
    background: linear-gradient(135deg, var(--sepia-light) 0%, var(--sepia-medium) 100%);
    min-height: 100vh;
    color: var(--ink-dark);
}

.header-main {
    background: linear-gradient(180deg, var(--sepia-dark) 0%, #4a3728 100%);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    border-bottom: 3px solid var(--gold-accent);
}

.logo-icon {
    font-size: 2.5rem;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
}

.logo-text {
    font-family: 'Crimson Pro', serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--gold-accent);
    margin: 0;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.subtitle-text {
    font-size: 0.85rem;
    color: #c4b69c;
    margin: 0;
}

.install-btn, .theme-toggle, .history-toggle {
    background: rgba(255,255,255,0.1);
    border: 1px solid var(--gold-accent);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    color: var(--gold-accent);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.install-btn:hover, .theme-toggle:hover, .history-toggle:hover {
    background: var(--gold-accent);
    color: var(--sepia-dark);
}

.offline-badge {
    background: #2d5a27;
    color: #90ee90;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.offline-badge.warning {
    background: #8b4513;
    color: #ffd700;
}

.sidebar {
    width: 280px;
    background: var(--parchment);
    border-right: 2px solid var(--sepia-medium);
    min-height: calc(100vh - 80px);
    box-shadow: 4px 0 15px rgba(0,0,0,0.1);
}

.sidebar-content {
    padding: 1.5rem;
}

.sidebar-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1.2rem;
    color: var(--sepia-dark);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--gold-accent);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    background: white;
    border: 1px solid var(--sepia-medium);
    border-radius: 8px;
    padding: 0.8rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.history-item:hover {
    border-color: var(--gold-accent);
    transform: translateX(4px);
}

.history-item.favorite {
    border-left: 3px solid var(--gold-accent);
}

.history-date {
    font-size: 0.7rem;
    color: #888;
}

.empty-state {
    color: #888;
    font-style: italic;
    text-align: center;
    padding: 2rem;
}

.clear-history-btn {
    margin-top: 1rem;
    width: 100%;
    background: transparent;
    border: 1px dashed #ccc;
    border-radius: 8px;
    padding: 0.8rem;
    color: #888;
    cursor: pointer;
    transition: all 0.2s ease;
}

.clear-history-btn:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

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

.search-section {
    padding: 3rem 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23c9a227' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.search-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.search-title {
    font-family: 'Crimson Pro', serif;
    font-size: 2rem;
    color: var(--sepia-dark);
    margin-bottom: 1.5rem;
}

.search-input-wrapper {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    border: 2px solid var(--sepia-medium);
    border-radius: 12px;
    background: white;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--gold-accent);
    box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.2);
}

.search-btn {
    padding: 1rem 2rem;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--sepia-dark) 0%, #6d4c3d 100%);
    color: var(--gold-accent);
    border: 2px solid var(--gold-accent);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

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

.depth-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    color: var(--ink-medium);
}

.depth-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--sepia-medium);
    background: white;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.depth-btn.active {
    background: var(--sepia-dark);
    color: var(--gold-accent);
    border-color: var(--gold-accent);
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
}

.suggestions-label {
    color: var(--ink-medium);
    font-size: 0.9rem;
}

.suggestion-chip {
    background: white;
    border: 1px solid var(--sepia-medium);
    border-radius: 20px;
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.suggestion-chip:hover {
    border-color: var(--gold-accent);
    background: var(--parchment);
}

.topics-section {
    padding: 2rem 0;
}

.section-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1.5rem;
    color: var(--sepia-dark);
    margin-bottom: 1.5rem;
    text-align: center;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    max-width: 900px;
    margin: 0 auto;
}

.topic-card {
    padding: 2rem 1rem;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.05;
    pointer-events: none;
}

.topic-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.topic-emoji {
    font-size: 2.5rem;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
}

.topic-title {
    color: white;
    font-weight: 600;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.loading-section {
    padding: 4rem;
    text-align: center;
}

.quill-animation {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.quill {
    font-size: 3rem;
    animation: writing 1.5s ease-in-out infinite;
}

@keyframes writing {
    0%, 100% { transform: rotate(-10deg) translateX(-5px); }
    50% { transform: rotate(10deg) translateX(5px); }
}

.loading-text {
    font-family: 'Crimson Pro', serif;
    font-size: 1.3rem;
    color: var(--sepia-dark);
    font-style: italic;
}

.response-section {
    padding: 2rem 0 4rem;
}

.response-card {
    background: var(--parchment);
    border-radius: 16px;
    padding: 2rem;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    border: 1px solid var(--sepia-medium);
    position: relative;
}

.response-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='paper'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.04' numOctaves='5'/%3E%3CfeDiffuseLighting in='noise' lighting-color='%23f5f0e6' surfaceScale='2'%3E%3CfeDistantLight azimuth='45' elevation='60'/%3E%3C/feDiffuseLighting%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23paper)'/%3E%3C/svg%3E");
    opacity: 0.3;
    pointer-events: none;
    border-radius: 16px;
}

.response-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    position: relative;
}

.response-title {
    font-family: 'Crimson Pro', serif;
    font-size: 2rem;
    color: var(--sepia-dark);
    margin: 0;
    border-bottom: 3px solid var(--gold-accent);
    padding-bottom: 0.5rem;
}

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

.action-btn {
    background: white;
    border: 1px solid var(--sepia-medium);
    border-radius: 8px;
    padding: 0.5rem 0.8rem;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    border-color: var(--gold-accent);
}

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

.response-block {
    margin-bottom: 2rem;
    position: relative;
}

.block-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1.3rem;
    color: var(--sepia-dark);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.block-content {
    line-height: 1.8;
    color: var(--ink-medium);
}

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

.events-list li {
    padding: 0.8rem 1rem;
    background: white;
    border-left: 3px solid var(--gold-accent);
    margin-bottom: 0.5rem;
    border-radius: 0 8px 8px 0;
}

.timeline {
    display: flex;
    overflow-x: auto;
    gap: 0;
    padding: 1rem 0;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gold-accent);
    transform: translateY(-50%);
}

.timeline-item {
    flex: 0 0 auto;
    min-width: 150px;
    background: white;
    border: 2px solid var(--gold-accent);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    position: relative;
    z-index: 1;
    margin-right: 1rem;
}

.timeline-year {
    display: block;
    font-family: 'Crimson Pro', serif;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--sepia-dark);
    margin-bottom: 0.3rem;
}

.timeline-event {
    font-size: 0.85rem;
    color: var(--ink-medium);
}

.curiosities {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #fcd34d;
}

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

.curiosities-list li {
    padding: 0.5rem 0 0.5rem 2rem;
    position: relative;
}

.curiosities-list li::before {
    content: '💡';
    position: absolute;
    left: 0;
}

.resources-section {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.resource-card {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.resource-card.wikipedia {
    background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
    border-left: 4px solid #3b82f6;
}

.resource-card.youtube {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border-left: 4px solid #ef4444;
}

.resource-card.educational {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-left: 4px solid #22c55e;
}

.resource-card h4 {
    margin: 0 0 0.5rem;
    font-family: 'Crimson Pro', serif;
    color: var(--ink-dark);
}

.wiki-extract {
    font-size: 0.9rem;
    color: var(--ink-medium);
    margin-bottom: 0.5rem;
}

.resource-link {
    color: var(--blue-accent);
    text-decoration: none;
    font-weight: 500;
}

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

.edu-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.edu-link {
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    text-decoration: none;
    color: var(--ink-dark);
    font-size: 0.9rem;
    border: 1px solid #ddd;
    transition: all 0.2s ease;
}

.edu-link:hover {
    border-color: var(--gold-accent);
    background: var(--parchment);
}

.related-topics {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px dashed var(--sepia-medium);
}

.related-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.related-chip {
    background: linear-gradient(135deg, var(--sepia-dark) 0%, #6d4c3d 100%);
    color: var(--gold-accent);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.related-chip:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.quiz-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--gold-accent);
    text-align: center;
}

.quiz-start-btn {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quiz-start-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 20px rgba(22, 163, 74, 0.4);
}

.quiz-container {
    text-align: left;
}

.quiz-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1.3rem;
    color: var(--sepia-dark);
    margin-bottom: 1.5rem;
    text-align: center;
}

.quiz-question {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.question-text {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--ink-dark);
}

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

.quiz-option {
    padding: 0.8rem 1rem;
    border: 2px solid var(--sepia-medium);
    border-radius: 8px;
    background: var(--parchment);
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.quiz-option:hover {
    border-color: var(--gold-accent);
}

.quiz-option.correct {
    background: #dcfce7;
    border-color: #22c55e;
}

.quiz-option.incorrect {
    background: #fee2e2;
    border-color: #ef4444;
}

.quiz-loading {
    padding: 2rem;
    color: var(--ink-medium);
    font-style: italic;
}

.footer {
    background: var(--sepia-dark);
    padding: 2rem 0;
    margin-top: 2rem;
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: #c4b69c;
    font-size: 0.9rem;
}

.status-indicator {
    font-size: 0.8rem;
}

.disclaimer {
    color: #a0917c;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.remix-link {
    color: var(--gold-accent);
    text-decoration: none;
    font-weight: 500;
}

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

/* Dark mode overrides */
.dark-theme .response-card,
.dark-theme .topic-card::before,
.dark-theme .response-card::before {
    opacity: 0.1;
}

.dark-theme .history-item,
.dark-theme .search-input,
.dark-theme .suggestion-chip,
.dark-theme .depth-btn,
.dark-theme .action-btn,
.dark-theme .events-list li,
.dark-theme .timeline-item,
.dark-theme .resource-card,
.dark-theme .quiz-question,
.dark-theme .quiz-option,
.dark-theme .edu-link {
    background: #2a3d2a;
    border-color: #3d5a3d;
    color: var(--ink-dark);
}

.dark-theme .resources-section {
    background: #1e2d1e;
}

.dark-theme .curiosities {
    background: linear-gradient(135deg, #2d3d1e 0%, #3d4d2e 100%);
    border-color: #5d6d3e;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 80px;
        height: calc(100vh - 80px);
        z-index: 40;
        transform: translateX(0);
    }

    .logo-text {
        font-size: 1.3rem;
    }

    .subtitle-text {
        display: none;
    }

    .search-title {
        font-size: 1.5rem;
    }

    .search-input-wrapper {
        flex-direction: column;
    }

    .search-btn {
        width: 100%;
    }

    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .response-card {
        padding: 1.5rem;
        margin: 0 1rem;
    }

    .response-title {
        font-size: 1.5rem;
    }

    .timeline {
        padding-bottom: 0.5rem;
    }

    .timeline-item {
        min-width: 120px;
    }

    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .topics-grid {
        grid-template-columns: 1fr;
    }

    .response-header {
        flex-direction: column;
        gap: 1rem;
    }

    .response-actions {
        align-self: flex-end;
    }
}