/* XlsOne Design System */

:root {
    --color-bg: #fafbfc;
    --color-bg-alt: #f0f4f8;
    --color-surface: #ffffff;
    --color-ink: #0f172a;
    --color-ink-secondary: #475569;
    --color-ink-tertiary: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-accent-soft: #eff6ff;
    --color-warm: #f59e0b;
    --color-success: #10b981;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --shadow-xl: 0 24px 56px rgba(0,0,0,0.10);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --max-width: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--color-bg);
    color: var(--color-ink);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; height: auto; display: block; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* Nav */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(226,232,240,0.6);
}
.nav .container { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.nav-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 0.95rem; font-weight: 700; color: var(--color-ink); letter-spacing: -0.02em; }
.nav-brand img { width: 28px; height: 28px; }
.nav-brand:hover { color: var(--color-accent); }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 0.9rem; color: var(--color-ink-secondary); font-weight: 500; }
.nav-links a:hover { color: var(--color-ink); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 26px; border-radius: var(--radius-full);
    font-size: 0.92rem; font-weight: 600; letter-spacing: -0.01em;
    transition: all var(--transition-fast);
    border: 1px solid transparent; cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--color-accent); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.22); }
.btn-primary:hover { background: var(--color-accent-hover); color: #fff; box-shadow: 0 6px 20px rgba(37,99,235,0.30); }
.btn-outline { background: var(--color-surface); color: var(--color-ink); border-color: var(--color-border); box-shadow: var(--shadow-sm); }
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); box-shadow: var(--shadow-md); }
.btn-icon { width: 18px; height: 18px; flex-shrink: 0; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }

/* Tags */
.tag {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 14px; border-radius: var(--radius-full);
    font-size: 0.78rem; font-weight: 600;
    background: var(--color-accent-soft); color: var(--color-accent);
}

/* Hero */
.hero {
    padding: 160px 0 90px;
}
.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}
.hero-text { }
.hero-text h1 {
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 800; letter-spacing: -0.04em;
    color: var(--color-ink); line-height: 1.15;
}
.hero-text h1 span {
    background: linear-gradient(135deg, var(--color-accent) 0%, #7c3aed 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-text .subtitle {
    font-size: 1.08rem; color: var(--color-ink-secondary);
    margin-top: 16px; line-height: 1.7;
}
.hero-text .actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual {
    position: relative;
}
.hero-visual img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border);
}
.hero-visual::before {
    content: '';
    position: absolute;
    inset: -12px;
    border-radius: calc(var(--radius-lg) + 12px);
    background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(124,58,237,0.06));
    z-index: -1;
}

/* Hero embedded video */
.hero-video {
    margin-top: 44px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}
.hero-video video {
    width: 100%;
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    background: #0f172a;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}
.hero-video-caption {
    margin-top: 12px;
    font-size: 0.88rem;
    color: var(--color-ink-tertiary);
    text-align: center;
}

/* Stats bar */
.stats-bar {
    padding: 48px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}
.stats-row {
    display: flex; justify-content: center; gap: 56px; text-align: center; flex-wrap: wrap;
}
.stat-item { min-width: 140px; }
.stat-icon {
    width: 44px; height: 44px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 12px;
    background: var(--color-accent-soft); color: var(--color-accent);
}
.stat-icon svg { width: 22px; height: 22px; }
.stat-number { font-size: 1.8rem; font-weight: 800; color: var(--color-ink); letter-spacing: -0.02em; }
.stat-label { font-size: 0.88rem; color: var(--color-ink-tertiary); margin-top: 4px; }
.platform-row { margin-top: 32px; display: flex; justify-content: center; gap: 8px; }
.platform-pill {
    padding: 6px 16px; border-radius: var(--radius-full);
    font-size: 0.8rem; font-weight: 600;
    background: var(--color-border-light); color: var(--color-ink-secondary);
}

/* Sections */
.section { padding: 100px 0; }
.section-alt { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section-title {
    text-align: center; font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 800; letter-spacing: -0.03em;
    margin-bottom: 16px; color: var(--color-ink);
}
.section-lead {
    text-align: center; color: var(--color-ink-secondary);
    font-size: 1.05rem; max-width: 620px;
    margin: 0 auto 64px;
}

/* Feature grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.feature-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.feature-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.feature-item .feature-icon {
    width: 44px; height: 44px; border-radius: 14px;
    background: var(--color-accent-soft);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px; color: var(--color-accent);
}
.feature-item .feature-icon svg { width: 22px; height: 22px; }
.feature-item h3 { font-size: 1.1rem; font-weight: 700; color: var(--color-ink); margin-bottom: 10px; letter-spacing: -0.01em; }
.feature-item p { font-size: 0.95rem; color: var(--color-ink-secondary); line-height: 1.65; }

/* Steps with screenshots */
.steps-layout {
    display: flex; flex-direction: column; gap: 80px;
}
.step-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}
.step-row.reverse .step-visual { order: -1; }
.step-visual img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}
.step-content {}
.step-content .step-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 32px; height: 32px; border-radius: var(--radius-full);
    background: var(--color-accent); color: #fff;
    font-size: 0.88rem; font-weight: 700;
    margin-bottom: 14px;
}
.step-content h3 { font-size: 1.4rem; font-weight: 700; color: var(--color-ink); margin-bottom: 12px; letter-spacing: -0.02em; }
.step-content p { font-size: 1rem; color: var(--color-ink-secondary); line-height: 1.75; }

/* Spec list */
.spec-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.spec-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
}
.spec-item .spec-key { font-size: 0.82rem; font-weight: 600; color: var(--color-ink-tertiary); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.spec-item .spec-val { font-size: 0.95rem; color: var(--color-ink); font-weight: 500; }

/* CTA */
.cta-section { padding: 80px 0 120px; text-align: center; }
.cta-card {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #4f46e5 100%);
    border-radius: var(--radius-xl); padding: 72px 48px;
    color: #fff; box-shadow: var(--shadow-xl);
}
.cta-card h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.cta-card p { font-size: 1.05rem; opacity: 0.9; margin-bottom: 32px; }
.cta-card .btn { background: #fff; color: var(--color-accent); box-shadow: 0 4px 20px rgba(0,0,0,0.15); font-size: 1rem; padding: 14px 36px; }
.cta-card .btn:hover { background: #f8fafc; color: var(--color-accent-hover); transform: translateY(-2px); }

/* Download page */
.download-section { padding: 130px 0 100px; }
.download-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.download-card {
    display: flex; justify-content: space-between; align-items: center;
    background: var(--color-surface); border: 1px solid var(--color-border);
    border-radius: var(--radius-md); padding: 24px 28px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.download-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.download-card .platform { font-weight: 700; font-size: 1.05rem; color: var(--color-ink); }
.download-card .meta { font-size: 0.85rem; color: var(--color-ink-tertiary); margin-top: 4px; }
.download-card .actions { display: flex; gap: 12px; align-items: center; flex-wrap: nowrap; }
.download-card .actions .btn { white-space: nowrap; flex-shrink: 0; }
.arch-hint { text-align: center; color: var(--color-ink-secondary); font-size: 0.92rem; margin-bottom: 36px; line-height: 1.8; }
.arch-hint code { background: var(--color-border-light); padding: 3px 8px; border-radius: var(--radius-sm); font-family: ui-monospace, monospace; font-size: 0.85rem; }

/* Download page preview */
.download-preview { max-width: 720px; margin: 0 auto 48px; text-align: center; }
.download-preview-link {
    position: relative;
    display: block;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.download-preview-link:hover { transform: translateY(-3px); box-shadow: var(--shadow-xl); }
.download-preview-link img { width: 100%; display: block; aspect-ratio: 16 / 9; object-fit: cover; }
.download-preview-badge {
    position: absolute;
    right: 16px;
    bottom: 16px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    background: rgba(255,255,255,0.92);
    color: var(--color-ink);
    font-size: 0.82rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}
.download-preview-caption { margin-top: 12px; font-size: 0.92rem; color: var(--color-ink-secondary); }

/* Content pages */
.content-page { padding: 130px 0 100px; max-width: 720px; margin: 0 auto; }
.content-page h1 { font-size: clamp(2rem, 4.5vw, 2.8rem); font-weight: 800; letter-spacing: -0.03em; color: var(--color-ink); margin-bottom: 8px; }
.content-page .last-updated { font-size: 0.9rem; color: var(--color-ink-tertiary); margin-bottom: 48px; }
.content-page h2 { font-size: 1.25rem; font-weight: 700; color: var(--color-ink); margin: 40px 0 12px; letter-spacing: -0.01em; }
.content-page p { font-size: 1rem; color: var(--color-ink-secondary); line-height: 1.75; margin-bottom: 12px; }
.content-page ul { padding-left: 22px; margin-bottom: 16px; }
.content-page li { font-size: 1rem; color: var(--color-ink-secondary); line-height: 1.8; margin-bottom: 6px; }
.content-page a { font-weight: 500; }

/* FAQ */
.faq-item {
    background: var(--color-surface); border: 1px solid var(--color-border);
    border-radius: var(--radius-md); padding: 24px 28px; margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.faq-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.faq-item h3 { font-size: 1.05rem; font-weight: 700; color: var(--color-ink); margin-bottom: 8px; }
.faq-item p { font-size: 0.95rem; color: var(--color-ink-secondary); line-height: 1.7; }

/* SEO landing and editorial pages */
.article-page { padding: 112px 0 96px; }
.article-shell { max-width: 880px; margin: 0 auto; }
.breadcrumbs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px; color: var(--color-ink-tertiary); font-size: 0.82rem; }
.breadcrumbs a { color: var(--color-ink-secondary); }
.breadcrumbs span + span::before, .breadcrumbs a + span::before { content: "/"; margin-right: 8px; color: var(--color-border); }
.article-hero { padding: 42px; border: 1px solid var(--color-border); border-radius: var(--radius-xl); background: linear-gradient(145deg, #fff 0%, var(--color-accent-soft) 100%); box-shadow: var(--shadow-sm); }
.article-hero .eyebrow { color: var(--color-accent); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 14px; }
.article-hero h1 { max-width: 780px; font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; line-height: 1.16; letter-spacing: -0.04em; }
.article-hero .summary { max-width: 760px; margin-top: 20px; color: var(--color-ink-secondary); font-size: 1.08rem; line-height: 1.8; }
.article-hero .actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.article-meta { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 18px; color: var(--color-ink-tertiary); font-size: 0.82rem; }
.article-body { max-width: 760px; margin: 56px auto 0; }
.article-body > h2 { margin: 52px 0 16px; font-size: clamp(1.45rem, 3vw, 1.9rem); line-height: 1.3; letter-spacing: -0.025em; }
.article-body > h3 { margin: 32px 0 12px; font-size: 1.18rem; }
.article-body > p, .article-body > ul, .article-body > ol { margin-bottom: 18px; color: var(--color-ink-secondary); font-size: 1rem; line-height: 1.85; }
.article-body > ul, .article-body > ol { padding-left: 24px; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--color-ink); }
.article-body code { overflow-wrap: anywhere; word-break: break-word; }
.article-figure { margin: 30px 0; }
.article-figure img, .article-figure video { width: 100%; border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); background: #fff; }
.article-figure figcaption { margin-top: 10px; color: var(--color-ink-tertiary); font-size: 0.82rem; text-align: center; }
.callout { margin: 28px 0; padding: 22px 24px; border-left: 4px solid var(--color-accent); border-radius: 0 var(--radius-md) var(--radius-md) 0; background: var(--color-accent-soft); color: var(--color-ink-secondary); line-height: 1.75; }
.callout strong { display: block; color: var(--color-ink); margin-bottom: 4px; }
.check-list { list-style: none; padding: 0 !important; }
.check-list li { position: relative; padding-left: 30px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--color-success); font-weight: 800; }
.metric-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 30px 0; }
.metric-card { padding: 20px; text-align: center; background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.metric-card strong { display: block; font-size: 1.4rem; color: var(--color-ink); }
.metric-card span { color: var(--color-ink-tertiary); font-size: 0.82rem; }
.comparison-wrap { margin: 28px 0; overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.comparison-table { width: 100%; min-width: 680px; border-collapse: collapse; }
.comparison-table th, .comparison-table td { padding: 15px 18px; border-bottom: 1px solid var(--color-border-light); text-align: left; vertical-align: top; font-size: 0.9rem; }
.comparison-table th { background: var(--color-bg-alt); color: var(--color-ink); font-weight: 700; }
.comparison-table td { color: var(--color-ink-secondary); }
.comparison-table tr:last-child td { border-bottom: 0; }
.related-section { margin-top: 64px; padding-top: 36px; border-top: 1px solid var(--color-border); }
.related-section h2 { margin-bottom: 20px; font-size: 1.35rem; }
.resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.resource-card { display: block; padding: 22px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; box-shadow: var(--shadow-sm); }
.resource-card:hover { border-color: var(--color-accent); box-shadow: var(--shadow-md); }
.resource-card strong { display: block; color: var(--color-ink); margin-bottom: 6px; }
.resource-card span { color: var(--color-ink-secondary); font-size: 0.9rem; line-height: 1.6; }
.video-frame { aspect-ratio: 16 / 9; width: 100%; border-radius: var(--radius-lg); background: #0f172a; }
.video-wrap { position: relative; display: block; width: 100%; }
.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(255,255,255,0.92);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    transition: transform var(--transition-fast), background var(--transition-fast), opacity var(--transition-fast);
    z-index: 2;
}
.video-play-btn:hover {
    transform: translate(-50%, -50%) scale(1.06);
    background: #fff;
}
.video-play-btn svg { width: 28px; height: 28px; color: var(--color-accent); margin-left: 4px; }
.video-wrap.playing .video-play-btn { opacity: 0; pointer-events: none; }
.inline-cta { margin: 48px 0 0; padding: 30px; border-radius: var(--radius-lg); background: var(--color-ink); color: #fff; }
.inline-cta h2 { font-size: 1.45rem; margin-bottom: 8px; }
.inline-cta p { color: #cbd5e1; margin-bottom: 20px; }

/* Lightbox */
.lightbox-overlay {
    display: none; position: fixed; inset: 0; z-index: 9999;
    background: rgba(0,0,0,0.94); align-items: center; justify-content: center;
}
.lightbox-overlay.active { display: flex; }
.lightbox-img { max-width: 92vw; max-height: 92vh; border-radius: 12px; box-shadow: 0 24px 64px rgba(0,0,0,0.5); }
.lightbox-close { position: absolute; top: 20px; right: 28px; background: none; border: none; font-size: 42px; color: #fff; cursor: pointer; z-index: 1; line-height: 1; opacity: 0.7; transition: opacity var(--transition-fast); }
.lightbox-close:hover { opacity: 1; }
.lightbox-nav { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.12); border: none; border-radius: 50%; width: 52px; height: 52px; font-size: 30px; color: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: background var(--transition-fast); line-height: 1; }
.lightbox-nav:hover { background: rgba(255,255,255,0.24); }
.lightbox-prev { left: 24px; }
.lightbox-next { right: 24px; }

/* Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.animate-in { animation: fadeInUp 0.6s ease both; }
.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }

/* Footer */
.footer { padding: 48px 0; background: var(--color-surface); border-top: 1px solid var(--color-border); text-align: center; }
.footer a { color: var(--color-ink-secondary); font-size: 0.88rem; margin: 0 14px; font-weight: 500; }
.footer a:hover { color: var(--color-ink); }
.footer .copyright { color: #aeaeb2; font-size: 0.72rem; margin-top: 4px; }
.footer .beian { margin-top: 10px; }
.footer .beian a { display: inline-flex; align-items: center; justify-content: center; color: var(--color-ink-tertiary); font-size: 0.78rem; margin: 0; gap: 6px; }
.footer .beian a:hover { color: var(--color-ink-secondary); }
.footer .beian img { height: 16px; }
.footer .icp { margin-top: 14px; }
.footer .icp a { font-size: 0.72rem; color: #aeaeb2; margin: 0; }
.footer .icp a:hover { color: var(--color-ink); }

/* Responsive */
@media (max-width: 768px) {
    .hero { padding: 110px 0 50px; }
    .step-row { grid-template-columns: 1fr; gap: 28px; }
    .step-row.reverse .step-visual { order: 0; }
    .step-visual { order: -1; }
    .steps-layout { gap: 48px; }
    .section { padding: 60px 0; }
    .section-alt { padding: 60px 0; }
    .stats-row { gap: 28px; }
    .stat-number { font-size: 1.4rem; }
    .stat-icon { width: 38px; height: 38px; border-radius: 12px; }
    .stat-icon svg { width: 18px; height: 18px; }
    .cta-card { padding: 44px 24px; }
    .spec-list { grid-template-columns: 1fr; }
    .article-page { padding: 92px 0 64px; }
    .article-hero { padding: 28px 22px; }
    .article-body { margin-top: 40px; }
    .metric-strip, .resource-grid { grid-template-columns: 1fr; }
    .comparison-wrap { margin-left: -8px; margin-right: -8px; }
    .feature-grid { grid-template-columns: 1fr; }
    .download-card { flex-direction: column; align-items: flex-start; gap: 16px; }
    .download-card .actions { width: 100%; flex-direction: column; align-items: stretch; gap: 10px; }
    .download-card .actions .btn { width: 100%; justify-content: center; }
    .download-section { padding: 110px 0 80px; }
    .content-page { padding: 110px 0 80px; }
    .lightbox-nav { width: 40px; height: 40px; font-size: 22px; }
    .lightbox-prev { left: 10px; }
    .lightbox-next { right: 10px; }
    .footer { padding: 36px 0; }
    .footer a { margin: 0 10px; font-size: 0.84rem; }
}
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .nav .container { height: 56px; }
    .nav-brand { gap: 6px; font-size: 0.85rem; }
    .nav-brand img { width: 22px; height: 22px; }
    .nav-links { gap: 14px; }
    .nav-links a { font-size: 0.8rem; }
    .hero { padding: 100px 0 40px; }
    .hero h1 { font-size: 1.8rem !important; }
    .hero .subtitle { font-size: 0.95rem !important; }
    .btn { padding: 10px 20px; font-size: 0.86rem; }
    .btn-lg { padding: 12px 26px; font-size: 0.92rem; }
    .section { padding: 48px 0; }
    .section-alt { padding: 48px 0; }
    .section-title { font-size: 1.4rem; }
    .section-lead { font-size: 0.92rem; margin-bottom: 40px; }
    .stats-row { gap: 20px; }
    .stat-item { min-width: 90px; }
    .stat-number { font-size: 1.2rem; }
    .stat-label { font-size: 0.78rem; }
    .step-number { width: 28px; height: 28px; font-size: 0.82rem; }
    .step-content h3 { font-size: 1.15rem; }
    .step-content p { font-size: 0.9rem; }
    .feature-item { padding: 22px 20px; }
    .feature-item h3 { font-size: 1rem; }
    .feature-item p { font-size: 0.88rem; }
    .spec-item { padding: 16px 18px; }
    .spec-item .spec-val { font-size: 0.88rem; }
    .cta-section { padding: 48px 0 80px; }
    .cta-card { padding: 36px 20px; }
    .cta-card h2 { font-size: 1.4rem; }
    .cta-card p { font-size: 0.92rem; }
    .download-list { gap: 12px; }
    .download-card { padding: 18px 20px; }
    .download-card .platform { font-size: 0.95rem; }
    .download-card .meta { font-size: 0.8rem; }
    .content-page { padding: 100px 0 60px; }
    .content-page h1 { font-size: 1.6rem; }
    .content-page h2 { font-size: 1.1rem; }
    .content-page p, .content-page li { font-size: 0.92rem; }
    .footer a { margin: 0 8px; font-size: 0.8rem; }
}
@media (max-width: 480px) {
    .container { padding: 0 18px; }
    .nav .container { height: 56px; }
    .nav-links { gap: 16px; }
    .nav-links a { font-size: 0.82rem; }
    .btn { padding: 10px 20px; font-size: 0.88rem; }
    .hero-text h1 { font-size: 1.9rem; }
    .section-title { font-size: 1.5rem; }
}