/**
 * Math Editor - Main Stylesheet
 * Shared across dashboard, editor pages
 */

/* ============================================
   MATH EDITOR NAV (Landing | Dashboard | New Doc)
   ============================================ */
.me-math-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 16px;
    background: var(--me-surface);
    border-bottom: 1px solid var(--me-border);
    gap: 12px;
}

.me-math-nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--me-text-primary);
    font-weight: 600;
    font-size: 15px;
}

.me-math-nav-logo:hover {
    color: var(--me-primary);
}

.me-math-nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.me-math-nav-link {
    padding: 6px 14px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--me-text-secondary);
    border-radius: var(--me-radius-sm);
    transition: all var(--me-transition);
}

.me-math-nav-link:hover {
    color: var(--me-primary);
    background: var(--me-primary-50);
}

.me-math-nav-new {
    background: var(--me-primary);
    color: #fff !important;
}

.me-math-nav-new:hover {
    background: var(--me-primary-dark);
    color: #fff !important;
}

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    --me-primary: #2563EB;
    --me-primary-dark: #1D4ED8;
    --me-primary-light: #3B82F6;
    --me-primary-50: #EFF6FF;
    --me-surface: #FFFFFF;
    --me-background: #F8FAFC;
    --me-border: #E2E8F0;
    --me-border-light: #F1F5F9;
    --me-text-primary: #0F172A;
    --me-text-secondary: #334155;
    --me-text-muted: #64748B;
    --me-math-bg: #EFF6FF;
    --me-success: #10B981;
    --me-warning: #F59E0B;
    --me-error: #EF4444;
    --me-radius-sm: 6px;
    --me-radius-md: 8px;
    --me-radius-lg: 12px;
    --me-radius-xl: 16px;
    --me-shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --me-shadow-md: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --me-shadow-lg: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --me-shadow-xl: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --me-font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --me-font-canvas: 'Latin Modern Roman', 'Computer Modern', 'CMU Serif', Georgia, 'Times New Roman', serif;
    --me-transition: 150ms ease;
}

/* ============================================
   DARK MODE — driven by data-theme attribute (set by dark-mode.js)
   dark-mode.js already respects OS preference via matchMedia,
   so we only need [data-theme] selectors here — no @media query.
   This ensures the nav toggle always works in both directions.
   ============================================ */
[data-theme="dark"] {
    --me-primary: #3B82F6;
    --me-primary-dark: #2563EB;
    --me-primary-light: #60A5FA;
    --me-primary-50: rgba(59,130,246,0.12);
    --me-surface: #1e293b;
    --me-background: #0f172a;
    --me-border: #334155;
    --me-border-light: #1e293b;
    --me-text-primary: #e2e8f0;
    --me-text-secondary: #cbd5e1;
    --me-text-muted: #94a3b8;
    --me-math-bg: rgba(59,130,246,0.1);
    --me-success: #34d399;
    --me-warning: #fbbf24;
    --me-error: #f87171;
    --me-shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --me-shadow-md: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --me-shadow-lg: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
    --me-shadow-xl: 0 10px 15px -3px rgba(0,0,0,0.4), 0 4px 6px -4px rgba(0,0,0,0.3);
}

/* ============================================
   BASE / RESET (scoped)
   ============================================ */
.math-editor-app {
    padding-top: var(--header-height-desktop, 72px);
    font-family: var(--me-font-ui);
    color: var(--me-text-primary);
    background: var(--me-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
@media (max-width: 991px) {
    .math-editor-app {
        padding-top: var(--header-height-mobile, 64px);
    }
}

.math-editor-app *,
.math-editor-app *::before,
.math-editor-app *::after {
    box-sizing: border-box;
}

/* ============================================
   LANDING PAGE - HERO
   ============================================ */
.me-hero {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 50%, #E0E7FF 100%);
    padding: 80px 24px 60px;
    position: relative;
    overflow: hidden;
}

.me-hero-compact {
    padding: 40px 24px 36px;
}

.me-hero-compact .me-hero-inner {
    display: block;
    text-align: center;
}

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

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

.me-hero::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -80px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.me-hero-inner {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.me-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(37,99,235,0.1);
    border: 1px solid rgba(37,99,235,0.2);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    color: var(--me-primary);
    margin-bottom: 20px;
}

.me-hero h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.1;
    color: var(--me-text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.me-hero h1 span {
    background: linear-gradient(135deg, var(--me-primary) 0%, #7C3AED 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.me-hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--me-text-secondary);
    margin-bottom: 32px;
    max-width: 480px;
}

.me-hero-actions {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.me-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--me-radius-md);
    font-size: 15px;
    font-weight: 600;
    font-family: var(--me-font-ui);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--me-transition);
    white-space: nowrap;
}

.me-btn-primary {
    background: var(--me-primary);
    color: #fff;
    box-shadow: 0 1px 3px rgba(37,99,235,0.3);
}

.me-btn-primary:hover {
    background: var(--me-primary-dark);
    box-shadow: 0 4px 12px rgba(37,99,235,0.35);
    transform: translateY(-1px);
}

.me-btn-secondary {
    background: var(--me-surface);
    color: var(--me-text-primary);
    border: 1px solid var(--me-border);
}

.me-btn-secondary:hover {
    background: var(--me-background);
    border-color: #CBD5E1;
}

/* Hero Screenshot Mockup */
.me-hero-visual {
    position: relative;
}

.me-editor-mockup {
    background: var(--me-surface);
    border-radius: var(--me-radius-xl);
    box-shadow: var(--me-shadow-xl), 0 0 0 1px rgba(0,0,0,0.04);
    overflow: hidden;
    border: 1px solid var(--me-border);
}

.me-mockup-titlebar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--me-background);
    border-bottom: 1px solid var(--me-border);
}

.me-mockup-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #E2E8F0;
}

.me-mockup-dot:nth-child(1) { background: #FCA5A5; }
.me-mockup-dot:nth-child(2) { background: #FCD34D; }
.me-mockup-dot:nth-child(3) { background: #6EE7B7; }

.me-mockup-title {
    flex: 1;
    text-align: center;
    font-size: 12px;
    color: var(--me-text-muted);
}

.me-mockup-toolbar {
    display: flex;
    gap: 4px;
    padding: 8px 16px;
    background: var(--me-background);
    border-bottom: 1px solid var(--me-border);
    flex-wrap: wrap;
}

.me-mockup-toolbar span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--me-text-muted);
    background: var(--me-surface);
    border: 1px solid var(--me-border-light);
}

.me-mockup-content {
    padding: 24px 32px;
    min-height: 200px;
    font-family: var(--me-font-canvas);
}

.me-mockup-content h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--me-text-primary);
}

.me-mockup-content p {
    font-size: 14px;
    color: var(--me-text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.me-mockup-math {
    background: var(--me-math-bg);
    border: 1px solid #BFDBFE;
    border-radius: var(--me-radius-md);
    padding: 16px 20px;
    text-align: center;
    font-size: 20px;
    color: var(--me-text-primary);
    font-family: var(--me-font-canvas);
    letter-spacing: 0.02em;
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.me-features {
    padding: 80px 24px;
    max-width: 1120px;
    margin: 0 auto;
}

.me-features-header {
    text-align: center;
    margin-bottom: 48px;
}

.me-features-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--me-text-primary);
    margin-bottom: 12px;
}

.me-features-header p {
    font-size: 16px;
    color: var(--me-text-muted);
    max-width: 520px;
    margin: 0 auto;
}

.me-features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.me-feature-card {
    background: var(--me-surface);
    border: 1px solid var(--me-border);
    border-radius: var(--me-radius-lg);
    padding: 32px 24px;
    transition: all var(--me-transition);
}

.me-feature-card:hover {
    border-color: #BFDBFE;
    box-shadow: var(--me-shadow-lg);
    transform: translateY(-2px);
}

.me-feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--me-radius-md);
    background: var(--me-primary-50);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 16px;
}

.me-feature-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--me-text-primary);
    margin-bottom: 8px;
}

.me-feature-card p {
    font-size: 14px;
    color: var(--me-text-muted);
    line-height: 1.6;
}

/* ============================================
   SHARED DOCUMENTS (dashboard when not logged in)
   ============================================ */
.me-recent-section {
    padding: 48px 24px 60px;
    max-width: 1120px;
    margin: 0 auto;
}

.me-recent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    min-height: 40px;
}

.me-recent-loading {
    color: var(--me-text-muted);
    font-size: 14px;
}

.me-recent-empty {
    color: var(--me-text-muted);
    font-size: 14px;
    grid-column: 1 / -1;
    text-align: center;
    padding: 24px;
}

.me-recent-card {
    display: flex;
    flex-direction: column;
    padding: 16px;
    background: var(--me-surface);
    border: 1px solid var(--me-border);
    border-radius: var(--me-radius-md);
    text-decoration: none;
    color: var(--me-text-primary);
    transition: all var(--me-transition);
}

.me-recent-card:hover {
    border-color: var(--me-primary);
    box-shadow: var(--me-shadow-md);
}

.me-recent-card-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.me-recent-card-meta {
    font-size: 12px;
    color: var(--me-text-muted);
}

/* ============================================
   CTA SECTION
   ============================================ */
.me-cta-section {
    padding: 60px 24px;
    text-align: center;
    background: linear-gradient(135deg, var(--me-primary) 0%, #7C3AED 100%);
    color: #fff;
}

.me-cta-section h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
}

.me-cta-section p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 24px;
}

.me-btn-white {
    background: #fff;
    color: var(--me-primary);
    font-weight: 600;
}

.me-btn-white:hover {
    background: #F8FAFC;
    transform: translateY(-1px);
}

/* ============================================
   LANDING FOOTER
   ============================================ */
.me-footer {
    padding: 32px 24px;
    text-align: center;
    border-top: 1px solid var(--me-border);
    background: var(--me-surface);
}

.me-footer-inner {
    max-width: 1120px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.me-footer-links {
    display: flex;
    gap: 24px;
}

.me-footer-links a {
    font-size: 13px;
    color: var(--me-text-muted);
    text-decoration: none;
    transition: color var(--me-transition);
}

.me-footer-links a:hover {
    color: var(--me-text-primary);
}

.me-footer-copy {
    font-size: 13px;
    color: var(--me-text-muted);
}

/* ============================================
   DASHBOARD PAGE
   ============================================ */
.me-dashboard {
    display: flex;
    min-height: calc(100vh - 60px);
}

/* Dashboard Top Bar */
.me-dash-topbar {
    height: 60px;
    background: var(--me-surface);
    border-bottom: 1px solid var(--me-border);
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.me-dash-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.me-dash-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    color: var(--me-text-primary);
    flex-shrink: 0;
}

.me-dash-logo svg {
    width: 28px;
    height: 28px;
}

.me-dash-search {
    flex: 1;
    max-width: 480px;
    position: relative;
}

.me-dash-search input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    border: 1px solid var(--me-border);
    border-radius: var(--me-radius-md);
    font-size: 14px;
    font-family: var(--me-font-ui);
    background: var(--me-background);
    color: var(--me-text-primary);
    transition: border-color var(--me-transition);
}

.me-dash-search input:focus {
    outline: none;
    border-color: var(--me-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.me-dash-search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--me-text-muted);
    font-size: 14px;
    pointer-events: none;
}

.me-dash-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.me-btn-new-doc {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--me-primary);
    color: #fff;
    border: none;
    border-radius: var(--me-radius-md);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--me-font-ui);
    cursor: pointer;
    transition: all var(--me-transition);
}

.me-btn-new-doc:hover {
    background: var(--me-primary-dark);
}

.me-btn-login {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--me-surface);
    color: var(--me-text-secondary);
    border: 1px solid var(--me-border);
    border-radius: var(--me-radius-sm);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--me-font-ui);
    text-decoration: none;
    transition: all var(--me-transition);
}

.me-btn-login:hover {
    background: var(--me-background);
    color: var(--me-primary);
    border-color: var(--me-primary);
}

.me-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--me-primary) 0%, #7C3AED 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid var(--me-border);
}

/* Dashboard Sidebar */
.me-sidebar {
    width: 240px;
    background: var(--me-surface);
    border-right: 1px solid var(--me-border);
    padding: 20px 12px;
    flex-shrink: 0;
}

.me-sidebar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--me-radius-md);
    font-size: 14px;
    color: var(--me-text-secondary);
    text-decoration: none;
    transition: all var(--me-transition);
    cursor: pointer;
}

.me-sidebar-item:hover {
    background: var(--me-background);
    color: var(--me-text-primary);
}

.me-sidebar-item.active {
    background: var(--me-primary-50);
    color: var(--me-primary);
    font-weight: 600;
}

.me-sidebar-item-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.me-sidebar-divider {
    height: 1px;
    background: var(--me-border);
    margin: 12px 8px;
}

.me-sidebar-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--me-text-muted);
    padding: 8px 12px 4px;
}

/* Dashboard Main Content */
.me-dash-main {
    flex: 1;
    padding: 28px 32px;
    overflow-y: auto;
}

.me-dash-main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.me-dash-main-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--me-text-primary);
}

.me-view-toggle {
    display: flex;
    border: 1px solid var(--me-border);
    border-radius: var(--me-radius-md);
    overflow: hidden;
}

.me-view-toggle button {
    padding: 6px 12px;
    border: none;
    background: var(--me-surface);
    color: var(--me-text-muted);
    font-size: 14px;
    cursor: pointer;
    font-family: var(--me-font-ui);
    transition: all var(--me-transition);
}

.me-view-toggle button.active {
    background: var(--me-primary-50);
    color: var(--me-primary);
}

.me-view-toggle button + button {
    border-left: 1px solid var(--me-border);
}

/* Document Cards Grid — CLS: reserve min-height to avoid shift when content loads */
.me-doc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    min-height: 200px;
    contain: layout;
}

.me-doc-loading {
    grid-column: 1 / -1;
    color: var(--me-text-muted);
    font-size: 14px;
    padding: 24px;
}

.me-doc-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px 24px;
}

.me-doc-empty p {
    color: var(--me-text-muted);
    margin-bottom: 16px;
}

.me-doc-card {
    background: var(--me-surface);
    border: 1px solid var(--me-border);
    border-radius: var(--me-radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: all var(--me-transition);
    position: relative;
}

a.me-doc-card {
    display: block;
    text-decoration: none;
    color: inherit;
}

.me-doc-card:hover {
    border-color: #BFDBFE;
    box-shadow: var(--me-shadow-md);
}

.me-doc-card-preview {
    height: 120px;
    background: var(--me-background);
    border-radius: var(--me-radius-sm);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--me-font-canvas);
    font-size: 12px;
    color: var(--me-text-muted);
    padding: 12px;
    line-height: 1.5;
    overflow: hidden;
    border: 1px solid var(--me-border-light);
}

.me-doc-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--me-text-primary);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.me-doc-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.me-doc-card-date {
    font-size: 12px;
    color: var(--me-text-muted);
}

.me-doc-card-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.me-doc-card-star {
    font-size: 14px;
    color: var(--me-border);
    cursor: pointer;
    transition: color var(--me-transition);
    background: none;
    border: none;
    padding: 2px;
}

.me-doc-card-star:hover,
.me-doc-card-star.starred {
    color: var(--me-warning);
}

.me-doc-card-menu {
    font-size: 16px;
    color: var(--me-text-muted);
    cursor: pointer;
    background: none;
    border: none;
    padding: 2px 4px;
    border-radius: 4px;
    line-height: 1;
    transition: background var(--me-transition);
}

.me-doc-card-menu:hover {
    background: var(--me-background);
}

.me-doc-card-avatars {
    display: flex;
    margin-top: 10px;
}

.me-doc-card-avatars .me-mini-avatar {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid var(--me-surface);
    font-size: 9px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    margin-left: -6px;
}

.me-doc-card-avatars .me-mini-avatar:first-child {
    margin-left: 0;
}

/* Empty State */
.me-empty-state {
    text-align: center;
    padding: 80px 24px;
}

.me-empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.me-empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--me-text-primary);
    margin-bottom: 8px;
}

.me-empty-state p {
    font-size: 14px;
    color: var(--me-text-muted);
    margin-bottom: 24px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    /* Hero */
    .me-hero {
        padding: 60px 20px 40px;
    }

    .me-hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .me-hero h1 {
        font-size: 32px;
    }

    .me-hero-subtitle {
        font-size: 16px;
    }

    .me-hero-visual {
        display: none;
    }

    /* Features */
    .me-features {
        padding: 48px 20px;
    }

    .me-features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .me-features-header h2 {
        font-size: 24px;
    }

    /* Footer */
    .me-footer-inner {
        flex-direction: column;
        gap: 12px;
    }

    /* Dashboard */
    .me-sidebar {
        display: none;
    }

    .me-dash-main {
        padding: 20px 16px;
    }

    .me-doc-grid {
        grid-template-columns: 1fr;
    }

    .me-dash-search {
        display: none;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .me-hero h1 {
        font-size: 38px;
    }

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

    .me-sidebar {
        width: 200px;
    }
}