/* ========================================
   Learning OS — Dark Mode Overrides
   ======================================== */

[data-theme="dark"] {
    --color-white: #0B0F1A;
    --color-gray-50: #111827;
    --color-gray-100: #1F2937;
    --color-gray-200: #374151;
    --color-gray-300: #4B5563;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #9CA3AF;
    --color-gray-600: #D1D5DB;
    --color-gray-700: #E5E7EB;
    --color-gray-800: #F3F4F6;
    --color-gray-900: #F9FAFB;
    --color-gray-950: #FFFFFF;

    /* Brighter primary colors in dark mode */
    --color-primary: #818CF8;
    --color-primary-light: #A5B4FC;
    --color-primary-dark: #6366F1;
    --color-primary-50: rgba(129, 140, 248, 0.12);
    --color-primary-100: rgba(129, 140, 248, 0.18);
    --color-primary-200: rgba(129, 140, 248, 0.28);

    --color-purple: #A78BFA;
    --color-purple-light: #C4B5FD;

    --color-success: #34D399;
    --color-success-light: rgba(52, 211, 153, 0.18);
    --color-warning-light: rgba(245, 158, 11, 0.18);
    --color-error-light: rgba(239, 68, 68, 0.18);

    --color-dark-bg: #050810;
    --color-dark-card: rgba(255, 255, 255, 0.04);
    --color-dark-border: rgba(255, 255, 255, 0.08);

    color-scheme: dark;
}

/* --- Nav --- */
[data-theme="dark"] #main-nav {
    background: rgba(11, 15, 26, 0.85);
    border-bottom-color: transparent;
}

[data-theme="dark"] #main-nav.scrolled {
    background: rgba(11, 15, 26, 0.95);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .nav-logo {
    color: #F9FAFB;
}

[data-theme="dark"] .nav-link {
    color: #9CA3AF;
}

[data-theme="dark"] .nav-link:hover {
    color: var(--color-primary-light);
    background: rgba(129, 140, 248, 0.12);
}

[data-theme="dark"] .mobile-menu-btn span {
    background: #D1D5DB;
}

[data-theme="dark"] .nav-links {
    /* Mobile nav overlay */
}

@media (max-width: 1024px) {
    [data-theme="dark"] .nav-links {
        background: rgba(11, 15, 26, 0.98);
        border-bottom-color: rgba(255, 255, 255, 0.08);
    }

    [data-theme="dark"] #main-nav {
        background: rgba(11, 15, 26, 0.98);
    }
}

@media (max-width: 768px) {
    [data-theme="dark"] .nav-links {
        background: rgba(11, 15, 26, 0.98);
        border-bottom-color: rgba(255, 255, 255, 0.08);
    }

    [data-theme="dark"] #main-nav {
        background: rgba(11, 15, 26, 0.98);
    }

    [data-theme="dark"] .demo-sidebar {
        background: #0d1117;
        border-bottom-color: rgba(255, 255, 255, 0.06);
    }

    [data-theme="dark"] .demo-node {
        border-color: rgba(255, 255, 255, 0.08);
    }
}

/* --- Hero --- */
[data-theme="dark"] #hero-section {
    background: linear-gradient(180deg, #0B0F1A 0%, #0B0F1A 60%);
}

[data-theme="dark"] .hero-grid {
    background-image:
        linear-gradient(rgba(129, 140, 248, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(129, 140, 248, 0.08) 1px, transparent 1px);
}

[data-theme="dark"] .hero-glow-1 {
    background: rgba(129, 140, 248, 0.18);
}

[data-theme="dark"] .hero-glow-2 {
    background: rgba(139, 92, 246, 0.1);
}

[data-theme="dark"] .hero-title {
    color: #FFFFFF;
}

[data-theme="dark"] .hero-badge {
    background: rgba(129, 140, 248, 0.18);
    border-color: rgba(129, 140, 248, 0.3);
}

[data-theme="dark"] .hero-stat-divider {
    background: rgba(255, 255, 255, 0.1);
}

/* --- Hero Window --- */
[data-theme="dark"] .hero-window {
    background: #111827;
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(129, 140, 248, 0.15);
}

[data-theme="dark"] .window-header {
    background: #0d1117;
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .window-title {
    color: #6B7280;
}

[data-theme="dark"] .demo-sidebar {
    background: #0d1117;
    border-right-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .demo-topic-name {
    color: #E5E7EB;
}

[data-theme="dark"] .demo-node.active {
    background: rgba(129, 140, 248, 0.18);
    color: var(--color-primary-light);
}

[data-theme="dark"] .demo-node.verified {
    color: #D1D5DB;
}

[data-theme="dark"] .demo-node.locked {
    color: #4B5563;
}

[data-theme="dark"] .demo-node.locked .node-status-icon {
    color: #374151;
}

[data-theme="dark"] .demo-progress {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .demo-main {
    background: #111827;
}

[data-theme="dark"] .demo-card-header h3 {
    color: #F3F4F6;
}

[data-theme="dark"] .demo-card-badge {
    background: rgba(129, 140, 248, 0.18);
}

[data-theme="dark"] .demo-card-section h4 {
    color: #E5E7EB;
}

[data-theme="dark"] .demo-card-section p {
    color: #9CA3AF;
}

/* --- Body + Sections --- */
[data-theme="dark"] body {
    background: #0B0F1A;
    color: #E5E7EB;
}

[data-theme="dark"] .section {
    background: #0B0F1A;
}

[data-theme="dark"] .section-dark {
    background: #050810;
}

[data-theme="dark"] .section-desc strong {
    color: #F9FAFB;
}

/* --- Pain cards --- */
[data-theme="dark"] .pain-card {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .pain-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .pain-card-highlight {
    background: rgba(129, 140, 248, 0.1);
    border-color: rgba(129, 140, 248, 0.3);
}

[data-theme="dark"] .pain-card h3 {
    color: #F3F4F6;
}

[data-theme="dark"] .pain-icon-search { background: rgba(37, 99, 235, 0.15); }
[data-theme="dark"] .pain-icon-chat { background: rgba(219, 39, 119, 0.15); }
[data-theme="dark"] .pain-icon-note { background: rgba(217, 119, 6, 0.15); }

/* --- Feature blocks --- */
[data-theme="dark"] .feature-info h3 {
    color: #F9FAFB;
}

[data-theme="dark"] .feature-info p {
    color: #9CA3AF;
}

[data-theme="dark"] .feature-list li {
    color: #D1D5DB;
}

/* Chain demo */
[data-theme="dark"] .chain-demo {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .chain-node-demo {
    background: #111827;
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .chain-num {
    background: rgba(255, 255, 255, 0.06);
    color: #9CA3AF;
}

[data-theme="dark"] .chain-verified .chain-num {
    background: rgba(16, 185, 129, 0.15);
}

[data-theme="dark"] .chain-active .chain-num {
    background: rgba(129, 140, 248, 0.22);
}

[data-theme="dark"] .chain-title {
    color: #E5E7EB;
}

[data-theme="dark"] .chain-active {
    border-color: rgba(129, 140, 248, 0.35);
    background: rgba(129, 140, 248, 0.1);
}

[data-theme="dark"] .chain-locked .chain-title {
    color: #4B5563;
}

[data-theme="dark"] .chain-connector {
    background: var(--color-success);
}

[data-theme="dark"] .chain-connector-locked {
    background: rgba(255, 255, 255, 0.08);
}

/* Teach demo */
[data-theme="dark"] .teach-demo {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .teach-task,
[data-theme="dark"] .teach-response,
[data-theme="dark"] .teach-feedback {
    background: #111827;
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .teach-task p {
    color: #D1D5DB;
}

[data-theme="dark"] .teach-answer-preview {
    color: #9CA3AF;
}

[data-theme="dark"] .teach-verdict {
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .teach-score {
    background: rgba(245, 158, 11, 0.15);
}

[data-theme="dark"] .feedback-strength span { color: #D1D5DB; }
[data-theme="dark"] .feedback-gap span { color: #D1D5DB; }

[data-theme="dark"] .teach-followup {
    background: rgba(129, 140, 248, 0.12);
    color: var(--color-primary-light);
}

/* Review demo */
[data-theme="dark"] .review-demo {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .review-header h4 {
    color: #F3F4F6;
}

[data-theme="dark"] .review-item {
    background: #111827;
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .review-node-name {
    color: #E5E7EB;
}

/* Analytics demo */
[data-theme="dark"] .analytics-demo {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .analytics-card {
    background: #111827;
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .analytics-chart {
    background: #111827;
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .analytics-chart h4 {
    color: #E5E7EB;
}

[data-theme="dark"] .radar-label-text {
    color: #9CA3AF;
}

[data-theme="dark"] .radar-bar-track {
    background: rgba(255, 255, 255, 0.06);
}

/* --- Pricing --- */
[data-theme="dark"] .toggle-label.active {
    color: #F9FAFB;
}

[data-theme="dark"] .toggle-switch {
    background: #374151;
}

[data-theme="dark"] .toggle-switch.active {
    background: var(--color-primary);
    box-shadow: 0 0 12px rgba(129, 140, 248, 0.4);
}

[data-theme="dark"] .pricing-card {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .pricing-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .pricing-card-featured {
    border-color: var(--color-primary);
    box-shadow: 0 0 40px rgba(129, 140, 248, 0.15);
}

[data-theme="dark"] .pricing-header {
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .price-amount {
    color: #F9FAFB;
}

[data-theme="dark"] .pricing-feature-group h4 {
    color: #6B7280;
}

[data-theme="dark"] .feature-highlight {
    color: var(--color-primary-light);
}

[data-theme="dark"] .feature-limited {
    color: #6B7280;
}

[data-theme="dark"] .byok-note {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .byok-icon {
    background: rgba(129, 140, 248, 0.18);
}

[data-theme="dark"] .byok-content h4 {
    color: #F3F4F6;
}

[data-theme="dark"] .byok-content strong {
    color: #F3F4F6;
}

/* --- Buttons in dark mode --- */
[data-theme="dark"] .btn-primary {
    background: linear-gradient(135deg, #818CF8, #A78BFA);
    color: #fff;
    box-shadow: 0 4px 18px rgba(129, 140, 248, 0.35);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 0 6px 24px rgba(129, 140, 248, 0.5);
}

[data-theme="dark"] .btn-outline {
    border-color: rgba(255, 255, 255, 0.18);
    color: #E5E7EB;
}

[data-theme="dark"] .btn-outline:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary-light);
    background: rgba(129, 140, 248, 0.12);
}

[data-theme="dark"] .btn-ghost {
    color: #9CA3AF;
}

[data-theme="dark"] .btn-ghost:hover {
    color: var(--color-primary-light);
    background: rgba(129, 140, 248, 0.1);
}

/* --- Download section --- */
[data-theme="dark"] .download-content h2 {
    color: #F9FAFB;
}

/* --- Final CTA --- */
[data-theme="dark"] .final-cta-block {
    background: var(--color-dark-surface);
    border-color: var(--color-dark-border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .final-cta-block h2 {
    color: #F9FAFB;
}

[data-theme="dark"] .final-cta-block p {
    color: #9CA3AF;
}

[data-theme="dark"] .trust-signals span {
    color: #6B7280;
}

/* --- Footer --- */
[data-theme="dark"] #site-footer {
    background: #050810;
}

/* --- FAQ in light mode sections (when dark) --- */
[data-theme="dark"] .faq-item {
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .faq-question {
    color: #F3F4F6;
}

[data-theme="dark"] .faq-answer p {
    color: #9CA3AF;
}

[data-theme="dark"] .faq-answer strong {
    color: #E5E7EB;
}

/* --- Toggle Controls Area --- */
.site-controls {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 8px;
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
    background: transparent;
    color: var(--color-gray-500);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
    position: relative;
}

.control-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: var(--color-primary-50);
}

[data-theme="dark"] .control-btn {
    border-color: rgba(255, 255, 255, 0.12);
    color: #9CA3AF;
}

[data-theme="dark"] .control-btn:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary-light);
    background: rgba(129, 140, 248, 0.12);
}

.lang-btn {
    width: auto;
    padding: 0 12px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

/* Tooltip */
.control-btn[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 10px;
    background: var(--color-gray-900);
    color: var(--color-white);
    font-size: 0.6875rem;
    font-weight: 500;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    z-index: 100;
}

[data-theme="dark"] .control-btn[data-tooltip]::after {
    background: #E5E7EB;
    color: #111827;
}

.control-btn:hover::after {
    opacity: 1;
}

/* Obsidian mockup in dark mode stays dark - already dark */

/* --- Theme Transition --- */
body.theme-transitioning,
body.theme-transitioning *,
body.theme-transitioning *::before,
body.theme-transitioning *::after {
    transition: background-color 0.4s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
}

/* --- Mobile overlay --- */
.mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: 72px;
    background: rgba(0, 0, 0, 0.4);
    z-index: calc(var(--z-nav) - 2);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-overlay.active {
    display: block;
    opacity: 1;
}

[data-theme="dark"] .mobile-overlay {
    background: rgba(0, 0, 0, 0.6);
}

/* --- Mobile controls inside nav-links panel --- */
.mobile-site-controls {
    display: none;
    padding: 12px 0 4px;
    border-top: 1px solid var(--color-gray-200);
    margin-top: 8px;
    gap: 8px;
}

.mobile-site-controls .control-btn {
    flex: 0 0 auto;
}

@media (max-width: 768px) {
    .nav-actions .site-controls {
        display: none;
    }

    .mobile-site-controls {
        display: flex;
        align-items: center;
    }

    .mobile-site-controls .control-btn[data-tooltip]::after {
        display: none;
    }
}

/* --- Step tags dark mode --- */
[data-theme="dark"] .step-tag {
    color: #E5E7EB;
}

[data-theme="dark"] .step-detail code {
    background: rgba(255, 255, 255, 0.06);
    color: #D1D5DB;
}

/* --- Use case cards dark mode --- */
[data-theme="dark"] .use-case-card {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .use-case-card h3 {
    color: #F3F4F6;
}

[data-theme="dark"] .use-case-scenario {
    color: #9CA3AF;
}

[data-theme="dark"] .use-case-topic code {
    background: rgba(129, 140, 248, 0.18);
    color: var(--color-primary-light);
}

[data-theme="dark"] .use-case-benefits li {
    color: #D1D5DB;
}

/* --- Template cards dark mode --- */
[data-theme="dark"] .template-card {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .template-card:hover {
    border-color: rgba(129, 140, 248, 0.35);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .template-card h4 {
    color: #F3F4F6;
}

[data-theme="dark"] .template-card p {
    color: #9CA3AF;
}

/* --- Download section dark mode --- */
[data-theme="dark"] .download-block {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .download-content p {
    color: #9CA3AF;
}

[data-theme="dark"] .download-requirements span {
    color: #9CA3AF;
}

/* --- Obsidian mockup dark refinements --- */
[data-theme="dark"] .obsidian-mockup {
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .obsidian-content h3 {
    color: #F3F4F6;
}

/* --- Section title/desc dark mode --- */
[data-theme="dark"] .section-title {
    color: #F9FAFB;
}

[data-theme="dark"] .section-desc {
    color: #9CA3AF;
}

[data-theme="dark"] .section-tag {
    color: var(--color-primary-light);
    background: rgba(129, 140, 248, 0.12);
    border-color: rgba(129, 140, 248, 0.25);
}

/* --- Nav link active state dark mode --- */
[data-theme="dark"] .nav-link.active {
    color: var(--color-primary-light);
    background: rgba(129, 140, 248, 0.12);
}

/* --- Trust signals dark mode --- */
[data-theme="dark"] .trust-signals span {
    color: #9CA3AF;
}

/* --- Footer dark mode refinements --- */
[data-theme="dark"] .footer-brand p {
    color: #6B7280;
}

[data-theme="dark"] .footer-links-group h4 {
    color: #D1D5DB;
}

[data-theme="dark"] .footer-links-group a {
    color: #6B7280;
}

[data-theme="dark"] .footer-links-group a:hover {
    color: var(--color-primary-light);
}

[data-theme="dark"] .footer-bottom {
    border-top-color: rgba(255, 255, 255, 0.06);
    color: #4B5563;
}

[data-theme="dark"] .footer-legal a {
    color: #4B5563;
}

[data-theme="dark"] .footer-legal a:hover {
    color: #9CA3AF;
}

/* --- Step number/icon dark mode --- */
[data-theme="dark"] .step-number {
    color: var(--color-primary-light);
}

[data-theme="dark"] .step-icon {
    background: rgba(129, 140, 248, 0.18);
}

[data-theme="dark"] .step-content h3 {
    color: #F3F4F6;
}

[data-theme="dark"] .step-content p {
    color: #9CA3AF;
}

/* --- Pricing note dark mode --- */
[data-theme="dark"] .pricing-note {
    color: #6B7280;
}

[data-theme="dark"] .pricing-tagline {
    color: #9CA3AF;
}