/* ============================================
   369 TESLA — Polity Quick Notes
   Main Stylesheet
   Kalviyogi Edunivra Pvt Ltd
   ============================================ */

/* === CSS Custom Properties === */
:root {
    /* Brand Colors */
    --primary: #1a237e;
    --primary-light: #283593;
    --primary-dark: #0d1757;
    --secondary: #ffd600;
    --secondary-dark: #c7a500;
    --accent-teal: #00bcd4;
    --accent-orange: #ff6f00;
    --accent-red: #d32f2f;
    --accent-green: #2e7d32;
    --accent-purple: #6a1b9a;

    /* Neutral Colors */
    --bg-dark: #0a0e27;
    --bg-card: #111640;
    --bg-card-hover: #1a1f54;
    --bg-surface: #161b4a;
    --text-primary: #ffffff;
    --text-secondary: #b0b8d9;
    --text-muted: #6b7499;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(255, 214, 0, 0.3);

    /* Glass */
    --glass-bg: rgba(17, 22, 64, 0.85);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Typography */
    --font-tamil: 'Noto Sans Tamil', sans-serif;
    --font-english: 'Outfit', 'Inter', sans-serif;

    /* Spacing */
    --nav-height: 70px;
    --container-max: 1400px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-tamil);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Animated background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 20%, rgba(26, 35, 126, 0.4) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 188, 212, 0.15) 0%, transparent 60%),
        radial-gradient(ellipse 50% 30% at 50% 50%, rgba(255, 214, 0, 0.05) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

/* === App Top Bar === */
.app-topbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--glass-border);
    padding-top: 0;
}
.topbar-inner {
    display: flex; align-items: center; height: 56px; padding: 0 12px; gap: 8px;
    overflow: hidden;
}
.topbar-back {
    width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
    border-radius: 50%; color: var(--text-primary); flex-shrink: 0;
    transition: background var(--transition-fast);
}
.topbar-back:active { background: rgba(255,255,255,0.1); }
.topbar-brand {
    display: flex; align-items: center; gap: 10px; flex-shrink: 0;
    white-space: nowrap; overflow: hidden;
}
.topbar-title-wrap {
    flex: 1; min-width: 0; display: flex; flex-direction: column;
}
.topbar-title {
    font-size: 16px; font-weight: 700; white-space: nowrap;
    overflow: hidden; text-overflow: ellipsis; line-height: 1.2;
}
.topbar-subtitle {
    font-size: 11px; color: var(--text-muted);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.topbar-actions { margin-left: auto; display: flex; gap: 4px; }
.topbar-btn {
    width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
    border-radius: 50%; border: none; background: none;
    color: var(--text-secondary); cursor: pointer; transition: all var(--transition-fast);
}
.topbar-btn:active { background: rgba(255,255,255,0.1); transform: scale(0.9); }

/* Search Drawer */
.search-drawer {
    display: none; overflow: hidden; padding: 0 12px;
    background: var(--bg-card); border-top: 1px solid transparent;
}
.search-drawer.open {
    display: block; padding: 8px 12px; border-top-color: var(--glass-border);
}
.search-form-mobile {
    display: flex; align-items: center; background: var(--bg-dark);
    border-radius: 12px; padding: 0 12px; height: 40px; border: 1px solid var(--border-color);
}
.search-icon-mobile { color: var(--text-muted); flex-shrink: 0; }
.search-input-mobile {
    flex: 1; border: none; background: none; color: var(--text-primary);
    font-family: var(--font-tamil); font-size: 14px; padding: 0 10px; outline: none;
}
.search-input-mobile::placeholder { color: var(--text-muted); }
.search-close { border: none; background: none; color: var(--text-muted); cursor: pointer; padding: 4px; }

/* === App Content === */
.app-content {
    padding-top: 56px;
    padding-bottom: 72px;
    min-height: 100vh;
}

/* === Bottom Navigation === */
.bottom-nav {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(10, 14, 39, 0.96);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    display: flex; justify-content: space-around; align-items: stretch;
    height: 64px;
    padding-bottom: 0;
}
.bnav-item {
    flex: 1; display: flex; flex-direction: column; align-items: center;
    justify-content: center; gap: 3px; color: var(--text-muted);
    font-size: 10px; font-weight: 500; text-decoration: none;
    transition: all var(--transition-fast); position: relative; padding: 6px 0;
    -webkit-tap-highlight-color: transparent;
}
.bnav-item svg { transition: transform var(--transition-spring); }
.bnav-item.active { color: var(--secondary); }
.bnav-item.active svg { transform: scale(1.1); }
.bnav-item.active::before {
    content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: 32px; height: 3px; border-radius: 0 0 4px 4px; background: var(--secondary);
}
.bnav-item:active { transform: scale(0.92); }

/* Brand */
.brand-text { display: flex; flex-direction: column; }
.brand-title {
    font-family: var(--font-english); font-weight: 800; font-size: 17px; letter-spacing: 1px;
    background: linear-gradient(135deg, #ffd600, #ffab00);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.brand-subtitle {
    font-family: var(--font-english); font-size: 10px; font-weight: 500;
    color: var(--text-secondary); letter-spacing: 0.5px;
}

/* === Footer === */
.app-footer {
    background: var(--bg-card); border-top: 1px solid var(--border-color);
    padding: 40px 24px 24px; text-align: center;
}
.app-footer .footer-container { max-width: 600px; margin: 0 auto; }
.app-footer .footer-brand {
    display: flex; align-items: center; justify-content: center; gap: 16px; margin-bottom: 20px;
}
.app-footer .footer-title {
    font-family: var(--font-english); font-size: 16px; font-weight: 700; color: var(--secondary);
}
.app-footer .footer-tagline { font-size: 13px; color: var(--text-muted); }
.app-footer .footer-info { margin-bottom: 16px; }
.app-footer .footer-company { font-size: 14px; font-weight: 600; color: var(--text-secondary); }
.app-footer .footer-company-ta { font-size: 13px; color: var(--text-muted); }
.app-footer .footer-prepared { font-size: 12px; color: var(--text-muted); margin-top: 8px; }
.app-footer .footer-bottom {
    border-top: 1px solid var(--border-color); padding-top: 16px;
    font-size: 11px; color: var(--text-muted);
}




/* === Hero Section === */
.hero-section {
    padding: 60px 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 214, 0, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 214, 0, 0.1);
    border: 1px solid rgba(255, 214, 0, 0.2);
    border-radius: 50px;
    color: var(--secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-english);
    letter-spacing: 1px;
    margin-bottom: 24px;
    animation: fadeInDown 0.6s ease-out;
}

.hero-title {
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 16px;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-title .highlight {
    background: linear-gradient(135deg, #ffd600, #ff6f00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: var(--font-english);
    font-size: 32px;
    font-weight: 800;
    color: var(--secondary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* === Section Container === */
.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px 60px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title .icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 214, 0, 0.1);
    border-radius: var(--radius-md);
    font-size: 20px;
}

/* === Category Pills === */
/* Category pills wrapper — allows full-width scroll */
.category-pills-wrapper {
    position: relative;
    margin: 0 -24px 32px;
}

.category-pills-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 60px;
    background: linear-gradient(to left, var(--bg-dark), transparent);
    pointer-events: none;
    z-index: 2;
}

/* Scroll arrow buttons */
.pills-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--secondary);
    font-size: 22px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 5;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.pills-arrow:hover {
    background: var(--secondary);
    color: var(--primary-dark);
    transform: translateY(-50%) scale(1.1);
}

.pills-arrow-left {
    left: 4px;
}

.pills-arrow-right {
    right: 4px;
}

.category-pills {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding: 8px 24px 14px;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    margin-bottom: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--secondary) transparent;
}

.category-pills::-webkit-scrollbar {
    height: 4px;
}

.category-pills::-webkit-scrollbar-track {
    background: transparent;
}

.category-pills::-webkit-scrollbar-thumb {
    background: var(--secondary);
    border-radius: 4px;
}

.category-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
    scroll-snap-align: start;
}

.category-pill:hover {
    background: var(--bg-card-hover);
    border-color: var(--secondary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.category-pill.active {
    background: var(--secondary);
    border-color: var(--secondary);
    color: var(--primary-dark);
    font-weight: 600;
}

.category-pill .count {
    background: rgba(255, 255, 255, 0.15);
    padding: 2px 8px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}

.category-pill.active .count {
    background: rgba(0, 0, 0, 0.2);
    color: var(--primary-dark);
}

/* === Topic Section Headers === */
.topic-section {
    margin-bottom: 48px;
    scroll-margin-top: 80px;
}

.topic-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border-radius: 16px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.topic-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.topic-info {
    flex: 1;
    min-width: 0;
}

.topic-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin: 0;
}

.topic-subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin: 2px 0 0;
}

.topic-view-all {
    white-space: nowrap;
    font-size: 13px;
    font-weight: 600;
    color: var(--secondary);
    padding: 8px 16px;
    border: 1px solid var(--secondary);
    border-radius: 50px;
    transition: all var(--transition-fast);
}

.topic-view-all:hover {
    background: var(--secondary);
    color: var(--primary-dark);
}

/* === Infographic Cards Grid === */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.infographic-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-smooth);
    cursor: pointer;
    position: relative;
}

.infographic-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, transparent, rgba(255, 214, 0, 0.3), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.infographic-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px rgba(255, 214, 0, 0.05);
}

.infographic-card:hover::before {
    opacity: 1;
}

.card-preview {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.card-preview-bg {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    position: relative;
}

.card-preview-bg::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(to top, var(--bg-card), transparent);
}

.card-page-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--primary);
    color: var(--secondary);
    padding: 4px 12px;
    border-radius: 50px;
    font-family: var(--font-english);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    z-index: 2;
    border: 1px solid rgba(255, 214, 0, 0.3);
}

.card-part-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 500;
    z-index: 2;
}

.card-body {
    padding: 20px;
}

.card-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-teal);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.card-title-en {
    font-family: var(--font-english);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.card-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.card-views {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-english);
}

.card-action {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--secondary), #ffab00);
    color: var(--primary-dark);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 700;
    transition: all var(--transition-fast);
}

.card-action:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(255, 214, 0, 0.3);
}

/* === Infographic Viewer === */
.viewer-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px 12px;
}

.viewer-page-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.viewer-page-badge {
    background: var(--primary);
    color: var(--secondary);
    padding: 4px 12px;
    border-radius: 50px;
    font-family: var(--font-english);
    font-size: 12px;
    font-weight: 700;
    border: 1px solid rgba(255, 214, 0, 0.3);
}

.viewer-category-tag {
    font-size: 13px;
    font-weight: 600;
}

.viewer-part-tag {
    background: rgba(255,255,255,0.08);
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    margin-left: auto;
}

.viewer-frame {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.4);
}

.viewer-iframe {
    width: 100%;
    min-height: 1200px;
    border: none;
    background: #fff;
}

/* Direct view - no iframe, scrollable content */
.viewer-direct {
    width: 100%;
    background: #fff;
    border-radius: var(--radius-xl);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.viewer-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 24px;
}

.viewer-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-tamil);
}

.viewer-btn-primary {
    background: linear-gradient(135deg, var(--secondary), #ffab00);
    color: var(--primary-dark);
}

.viewer-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 214, 0, 0.3);
}

.viewer-btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.viewer-btn-outline:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

/* Page navigation */
.page-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 32px;
    gap: 16px;
}

.page-nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.page-nav-btn:hover {
    border-color: var(--secondary);
    transform: translateY(-2px);
}

.page-nav-btn.next {
    text-align: right;
    flex-direction: row-reverse;
}

.page-nav-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.page-nav-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* === Footer === */
.site-footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 40px 24px;
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
}

.footer-title {
    font-family: var(--font-english);
    font-size: 18px;
    font-weight: 700;
    color: var(--secondary);
}

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

.footer-info {
    margin-bottom: 20px;
}

.footer-company {
    font-family: var(--font-english);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.footer-company-ta {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.footer-prepared {
    margin-top: 8px;
    font-family: var(--font-english);
    font-size: 13px;
    color: var(--text-muted);
}

.footer-bottom {
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-english);
}

/* === Search Page === */
.search-results-header {
    margin-bottom: 32px;
}

.search-query {
    font-size: 24px;
    font-weight: 700;
}

.search-count {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

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

.empty-state svg {
    margin-bottom: 24px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

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

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

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.animate-in {
    animation: fadeInUp 0.5s ease-out both;
}

.cards-grid .infographic-card:nth-child(1) { animation-delay: 0.05s; }
.cards-grid .infographic-card:nth-child(2) { animation-delay: 0.1s; }
.cards-grid .infographic-card:nth-child(3) { animation-delay: 0.15s; }
.cards-grid .infographic-card:nth-child(4) { animation-delay: 0.2s; }
.cards-grid .infographic-card:nth-child(5) { animation-delay: 0.25s; }
.cards-grid .infographic-card:nth-child(6) { animation-delay: 0.3s; }

/* === Responsive === */
@media (max-width: 768px) {
    .nav-search {
        display: none;
    }

    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: block;
    }

    .nav-links.open {
        display: flex;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        padding: 16px;
        border-bottom: 1px solid var(--glass-border);
        gap: 4px;
    }

    .hero-section {
        padding: 40px 16px;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 24px;
    }

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

    .section-container {
        padding: 0 16px 40px;
    }

    .viewer-container {
        padding: 20px 12px;
    }

    .page-navigation {
        flex-direction: column;
    }

    .category-pills-wrapper {
        margin: 0 -16px 24px;
    }

    .category-pills {
        padding: 4px 16px 10px;
    }

    .topic-header {
        padding: 12px 14px;
        gap: 12px;
    }

    .topic-icon {
        width: 40px;
        height: 40px;
        min-width: 40px;
        font-size: 20px;
    }

    .topic-title {
        font-size: 15px;
    }

    .topic-view-all {
        font-size: 11px;
        padding: 6px 12px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 24px;
    }

    .viewer-container {
        padding: 10px 4px;
    }

    .viewer-frame {
        border-radius: 12px;
    }

    .viewer-iframe {
        min-height: 900px;
    }

    .viewer-actions {
        flex-direction: column;
        gap: 8px;
    }

    .viewer-btn {
        width: 100%;
        justify-content: center;
    }
}

/* === PWA / Standalone === */
@media (display-mode: standalone) {
    .app-topbar {
        padding-top: env(safe-area-inset-top);
    }
    .app-content {
        padding-top: calc(56px + env(safe-area-inset-top));
    }
    .bottom-nav {
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* === Loading Skeleton === */
.skeleton {
    background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* === Critical Overrides (end of file) === */
#bottomNav {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 9999 !important;
    display: flex !important;
    height: 64px !important;
    background: rgba(10, 14, 39, 0.98) !important;
    border-top: 1px solid rgba(255,255,255,0.1) !important;
    justify-content: space-around !important;
    align-items: center !important;
}

#searchDrawer {
    display: none !important;
}
#searchDrawer.open {
    display: block !important;
}