/* ============================================
   Template 02 - APP下载专题站
   主题: 深蓝科技 + 荧光绿点缀
   Design System: Tech SaaS
   ============================================ */

/* --- CSS Variables --- */
:root {
    --bg-primary: #091320;
    --bg-secondary: #0e1f33;
    --bg-card: #132940;
    --bg-card-hover: #1a3652;
    --bg-input: #0e1f33;
    --border: #1a3652;
    --border-light: #234566;

    --text-primary: #e8f0f8;
    --text-secondary: #a0b8cc;
    --text-muted: #6889a6;
    --text-inverse: #091320;

    --accent: #10b981;
    --accent-light: #34d399;
    --accent-dark: #059669;
    --accent-glow: rgba(16, 185, 129, 0.25);
    --accent-soft: rgba(16, 185, 129, 0.08);

    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    --gradient-hero: linear-gradient(135deg, #091320 0%, #0d2137 30%, #0f2d45 60%, #091320 100%);
    --gradient-accent: linear-gradient(135deg, #10b981 0%, #06d6a0 50%, #34d399 100%);
    --gradient-card: linear-gradient(180deg, rgba(16, 185, 129, 0.05) 0%, rgba(16, 185, 129, 0.01) 100%);
    --gradient-overlay: linear-gradient(0deg, #091320 0%, rgba(9, 19, 32, 0.6) 50%, rgba(9, 19, 32, 0.2) 100%);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);
    --shadow-card: 0 4px 16px rgba(16, 185, 129, 0.06);

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    --header-height: 70px;
    --max-width: 1200px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { color: var(--accent-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
h1 { font-size: 2.8rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.35rem; }
p { color: var(--text-secondary); margin-bottom: 1rem; }

/* --- Container --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* --- Header --- */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    height: var(--header-height);
    background: rgba(9, 19, 32, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(16, 185, 129, 0.1);
    transition: var(--transition);
}
.site-header.scrolled { background: rgba(9, 19, 32, 0.95); }
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.4rem; font-weight: 800; color: var(--text-primary); }
.logo-icon {
    width: 40px; height: 40px; border-radius: var(--radius-sm);
    background: var(--gradient-accent);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; color: var(--text-inverse); font-weight: 800;
}
.logo span { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
    color: var(--text-secondary); padding: 8px 16px; border-radius: var(--radius);
    font-size: 0.9rem; font-weight: 500; transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: var(--accent-light); background: var(--accent-soft); }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; }

/* --- Hero Section --- */
.page-hero {
    position: relative; min-height: 520px; display: flex; align-items: center;
    background: var(--gradient-hero); overflow: hidden; padding-top: var(--header-height);
}
.page-hero::before {
    content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}
.page-hero::after {
    content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
    background: linear-gradient(0deg, var(--bg-primary) 0%, transparent 100%);
    pointer-events: none;
}
.hero-content { position: relative; z-index: 2; padding: 72px 0; display: flex; flex-direction: column; gap: 24px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; border-radius: 50px;
    background: var(--accent-soft); border: 1px solid var(--accent-glow);
    color: var(--accent-light); font-size: 0.85rem; font-weight: 600;
    width: fit-content;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero-title { font-size: 3rem; font-weight: 800; line-height: 1.2; max-width: 700px; }
.hero-title .highlight { color: var(--accent-light); position: relative; }
.hero-desc { font-size: 1.1rem; color: var(--text-secondary); max-width: 560px; line-height: 1.8; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual { position: absolute; right: -40px; top: 50%; transform: translateY(-50%); z-index: 1; max-width: 500px; opacity: 0.9; }

/* --- Buttons --- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius); font-size: 0.95rem; font-weight: 600; cursor: pointer; border: none; transition: var(--transition); text-decoration: none; white-space: nowrap; }
.btn-primary { background: var(--gradient-accent); color: var(--text-inverse); box-shadow: var(--shadow-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 30px var(--accent-glow); color: var(--text-inverse); }
.btn-outline { background: transparent; border: 1.5px solid var(--accent); color: var(--accent-light); }
.btn-outline:hover { background: var(--accent-soft); transform: translateY(-2px); }
.btn-secondary { background: var(--bg-card); border: 1px solid var(--border); color: var(--text-primary); }
.btn-secondary:hover { background: var(--bg-card-hover); border-color: var(--accent); }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; border-radius: var(--radius-lg); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-icon { width: 42px; height: 42px; padding: 0; border-radius: 50%; }

/* --- Section --- */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-label {
    display: inline-block; padding: 5px 14px; border-radius: 50px;
    background: var(--accent-soft); border: 1px solid var(--accent-glow);
    color: var(--accent-light); font-size: 0.82rem; font-weight: 600; margin-bottom: 16px;
}
.section-title { font-size: 2.2rem; margin-bottom: 16px; }
.section-desc { max-width: 620px; margin: 0 auto; color: var(--text-muted); font-size: 1.05rem; }

/* --- Cards --- */
.card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px;
    transition: var(--transition); position: relative; overflow: hidden;
}
.card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--shadow-card); }
.card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: var(--gradient-accent); opacity: 0; transition: var(--transition);
}
.card:hover::before { opacity: 1; }
.card-icon {
    width: 52px; height: 52px; border-radius: var(--radius);
    background: var(--accent-soft); display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px; font-size: 1.4rem;
}
.card h3 { margin-bottom: 10px; font-size: 1.2rem; }
.card p { font-size: 0.92rem; color: var(--text-muted); margin: 0; }

/* --- Download Cards (特色设计) --- */
.download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.download-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 36px 28px; text-align: center;
    transition: var(--transition); position: relative;
}
.download-card:hover { border-color: var(--accent); transform: translateY(-6px); box-shadow: var(--shadow-glow); }
.download-card.featured { border-color: var(--accent); box-shadow: var(--shadow-glow); }
.download-card .badge-popular {
    position: absolute; top: 14px; right: 14px;
    padding: 4px 12px; border-radius: 50px;
    background: var(--gradient-accent); color: var(--text-inverse);
    font-size: 0.78rem; font-weight: 700;
}
.download-icon { width: 64px; height: 64px; margin: 0 auto 20px; border-radius: var(--radius); background: var(--accent-soft); display: flex; align-items: center; justify-content: center; font-size: 2rem; }
.download-card h3 { margin-bottom: 6px; }
.download-card .version { color: var(--accent-light); font-size: 0.85rem; margin-bottom: 8px; }
.download-card .size { color: var(--text-muted); font-size: 0.82rem; margin-bottom: 20px; }
.download-card .features { text-align: left; margin: 20px 0; }
.download-card .features li { padding: 6px 0; color: var(--text-secondary); font-size: 0.9rem; display: flex; align-items: center; gap: 8px; }
.download-card .features li::before { content: '✓'; color: var(--accent); font-weight: 700; }

/* --- Stats Bar --- */
.stats-bar {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
    padding: 48px 0;
}
.stat-item { text-align: center; padding: 20px; }
.stat-number { font-size: 2.6rem; font-weight: 800; color: var(--accent-light); line-height: 1; }
.stat-label { color: var(--text-muted); font-size: 0.95rem; margin-top: 8px; }

/* --- Breadcrumb --- */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; color: var(--text-muted); margin-bottom: 12px; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb .sep { color: var(--accent); }

/* --- Features Grid --- */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }

/* --- Timeline --- */
.timeline { position: relative; padding-left: 40px; }
.timeline::before { content: ''; position: absolute; left: 16px; top: 0; bottom: 0; width: 2px; background: var(--border); }
.timeline-item { position: relative; margin-bottom: 40px; padding-bottom: 10px; }
.timeline-item::before {
    content: ''; position: absolute; left: -30px; top: 6px;
    width: 14px; height: 14px; border-radius: 50%;
    background: var(--accent); border: 3px solid var(--bg-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}
.timeline-date { color: var(--accent-light); font-size: 0.85rem; font-weight: 600; margin-bottom: 4px; }
.timeline-version { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.timeline-content { color: var(--text-secondary); }

/* --- FAQ --- */
.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: var(--transition); }
.faq-item:hover { border-color: var(--accent); }
.faq-question {
    width: 100%; padding: 20px 24px; text-align: left; background: none; border: none;
    color: var(--text-primary); font-size: 1rem; font-weight: 600; cursor: pointer;
    display: flex; justify-content: space-between; align-items: center; gap: 16px;
    font-family: var(--font-sans);
}
.faq-question .faq-icon { font-size: 1.2rem; color: var(--accent); transition: var(--transition); flex-shrink: 0; }
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; }
.faq-item.active .faq-answer { max-height: 500px; }
.faq-answer-inner { padding: 0 24px 20px; color: var(--text-secondary); line-height: 1.8; font-size: 0.95rem; }

/* --- Article Grid --- */
.article-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 28px; }
.article-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition);
}
.article-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--shadow-card); }
.article-card-img { height: 200px; overflow: hidden; }
.article-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.article-card:hover .article-card-img img { transform: scale(1.05); }
.article-card-body { padding: 22px; }
.article-card-tag {
    display: inline-block; padding: 3px 10px; border-radius: 50px;
    background: var(--accent-soft); color: var(--accent-light);
    font-size: 0.78rem; font-weight: 600; margin-bottom: 10px;
}
.article-card h3 { font-size: 1.1rem; margin-bottom: 8px; line-height: 1.5; }
.article-card-meta { color: var(--text-muted); font-size: 0.82rem; display: flex; gap: 14px; }

/* --- Article Detail --- */
.article-detail { padding: 80px 0; }
.article-featured-img { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 36px; }
.article-featured-img img { width: 100%; border-radius: var(--radius-lg); }
.article-body { line-height: 1.9; color: var(--text-secondary); }
.article-body h2 { margin: 40px 0 16px; font-size: 1.6rem; color: var(--text-primary); }
.article-body h3 { margin: 28px 0 12px; color: var(--text-primary); }
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol { margin: 16px 0; padding-left: 24px; }
.article-body li { margin-bottom: 8px; color: var(--text-secondary); }
.article-body blockquote {
    border-left: 3px solid var(--accent); background: var(--accent-soft);
    padding: 16px 24px; margin: 24px 0; border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic; color: var(--text-primary);
}
.article-meta-top {
    display: flex; gap: 20px; align-items: center; color: var(--text-muted);
    font-size: 0.9rem; margin-bottom: 12px; flex-wrap: wrap;
}
.article-meta-top .tag { padding: 3px 12px; border-radius: 50px; background: var(--accent-soft); color: var(--accent-light); font-weight: 600; }

/* --- Comparison Table (特色) --- */
.compare-table { width: 100%; border-collapse: separate; border-spacing: 0; margin: 32px 0; border-radius: var(--radius-lg); overflow: hidden; }
.compare-table thead th {
    background: var(--gradient-accent); color: var(--text-inverse); padding: 16px 20px;
    text-align: left; font-weight: 700; font-size: 0.95rem;
}
.compare-table thead th:first-child { border-radius: var(--radius-lg) 0 0 0; }
.compare-table thead th:last-child { border-radius: 0 var(--radius-lg) 0 0; }
.compare-table tbody td {
    padding: 14px 20px; border-bottom: 1px solid var(--border); color: var(--text-secondary); font-size: 0.92rem;
}
.compare-table tbody tr:nth-child(even) td { background: var(--bg-card); }
.compare-table tbody tr:last-child td:first-child { border-radius: 0 0 0 var(--radius-lg); }
.compare-table tbody tr:last-child td:last-child { border-radius: 0 0 var(--radius-lg) 0; }
.compare-table .check { color: var(--accent); font-weight: 700; }

/* --- Contact Form --- */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; padding: 60px 0; }
.contact-info h3 { margin-bottom: 16px; }
.contact-info-item { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 24px; }
.contact-info-item .icon {
    width: 44px; height: 44px; border-radius: var(--radius); background: var(--accent-soft);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 1.2rem;
}
.contact-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; color: var(--text-primary); font-size: 0.9rem; font-weight: 600; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 12px 16px; background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius); color: var(--text-primary); font-size: 0.95rem;
    font-family: var(--font-sans); transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* --- About Page --- */
.about-hero-img { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 48px; }
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; margin-top: 40px; }
.value-card { text-align: center; padding: 32px 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); }
.value-icon { font-size: 2.2rem; margin-bottom: 16px; }
.value-card h3 { margin-bottom: 10px; }

/* --- CTA Section --- */
.cta-section {
    background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xl);
    padding: 56px; text-align: center; margin: 80px 0;
}
.cta-section h2 { margin-bottom: 12px; }
.cta-section p { max-width: 500px; margin: 0 auto 28px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* --- Pagination --- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 48px; }
.pagination a, .pagination span {
    display: inline-flex; align-items: center; justify-content: center;
    width: 40px; height: 40px; border-radius: var(--radius);
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-secondary); font-size: 0.9rem; font-weight: 600; transition: var(--transition);
}
.pagination a:hover { border-color: var(--accent); color: var(--accent-light); }
.pagination .active { background: var(--gradient-accent); color: var(--text-inverse); border-color: transparent; }

/* --- Footer --- */
.site-footer {
    background: var(--bg-secondary); border-top: 1px solid var(--border);
    padding: 60px 0 30px; margin-top: 80px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: var(--text-primary); margin-bottom: 18px; font-size: 1rem; }
.footer-col a { display: block; color: var(--text-muted); font-size: 0.9rem; padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent-light); padding-left: 4px; }
.footer-bottom {
    border-top: 1px solid var(--border); padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
    color: var(--text-muted); font-size: 0.85rem;
}
.footer-social { display: flex; gap: 12px; }
.footer-social a {
    width: 38px; height: 38px; border-radius: 50%; background: var(--bg-card);
    border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary); transition: var(--transition);
}
.footer-social a:hover { border-color: var(--accent); color: var(--accent-light); background: var(--accent-soft); }

/* --- Customer Service Float --- */
.cs-float {
    position: fixed; right: 24px; bottom: 100px; z-index: 9999;
    transition: var(--transition);
}
.cs-toggle {
    width: 56px; height: 56px; border-radius: 50%; background: var(--gradient-accent);
    border: none; cursor: pointer; box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--text-inverse); transition: var(--transition);
}
.cs-toggle:hover { transform: scale(1.08); }
.cs-panel {
    position: absolute; bottom: 68px; right: 0; width: 300px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
    padding: 24px; opacity: 0; transform: translateY(10px); pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
}
.cs-panel.visible { opacity: 1; transform: translateY(0); pointer-events: all; }
.cs-panel h4 { font-size: 1rem; margin-bottom: 6px; }
.cs-panel .cs-hint { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 14px; line-height: 1.6; }
.cs-panel .cs-wechat {
    display: flex; align-items: center; gap: 10px; padding: 12px 16px;
    background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius); margin-bottom: 14px;
}
.cs-panel .cs-wechat-id { font-size: 1.15rem; font-weight: 700; color: var(--accent-light); font-family: var(--font-mono); }
.cs-copy-btn {
    width: 100%; padding: 11px; border-radius: var(--radius);
    background: var(--gradient-accent); color: var(--text-inverse);
    border: none; font-size: 0.9rem; font-weight: 700; cursor: pointer;
    transition: var(--transition);
}
.cs-copy-btn:hover { box-shadow: var(--shadow-glow); }
.cs-copy-btn.copied { background: var(--accent-dark); }

/* --- Responsive --- */
@media (max-width: 1024px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.7rem; }
    .hero-title { font-size: 2.4rem; }
    .hero-visual { max-width: 360px; right: -80px; opacity: 0.5; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-layout { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .main-nav { display: none; }
    .mobile-menu-btn { display: block; }
    .main-nav.open {
        display: flex; flex-direction: column; position: absolute; top: var(--header-height);
        left: 0; right: 0; background: rgba(9, 19, 32, 0.98);
        backdrop-filter: blur(16px); padding: 16px; gap: 4px;
        border-bottom: 1px solid var(--border);
    }
    .hero-title { font-size: 1.9rem; }
    .hero-visual { display: none; }
    .page-hero { min-height: 400px; }
    .section { padding: 60px 0; }
    .download-grid { grid-template-columns: 1fr; }
    .article-grid { grid-template-columns: 1fr; }
    .cta-section { padding: 36px 24px; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .cs-float { right: 14px; bottom: 80px; }
    .cs-panel { width: 280px; right: -10px; }
}
@media (max-width: 480px) {
    .container, .container-sm { padding: 0 16px; }
    h1 { font-size: 1.7rem; }
    h2 { font-size: 1.4rem; }
    .hero-title { font-size: 1.6rem; }
    .hero-desc { font-size: 0.95rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
    .stats-bar { grid-template-columns: 1fr 1fr; }
    .stat-number { font-size: 2rem; }
    .section-title { font-size: 1.5rem; }
    .cs-panel { width: 260px; right: -18px; }
}