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

:root {
    --bg-deep: #F5F6FA;
    --bg-primary: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-elevated: #F8F9FD;
    --bg-hover: #F0F2F8;
    --border: rgba(0,0,0,0.06);
    --border-active: rgba(0,0,0,0.12);
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --accent: #4B7BFF;
    --accent-hover: #6391FF;
    --accent-subtle: rgba(75,123,255,0.10);
    --accent-cyan: #0CA678;
    --accent-amber: #D97706;
    --accent-rose: #E11D48;
    --accent-purple: #7C3AED;
    --font-sans: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
    --font-mono: 'Consolas', 'Courier New', monospace;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --shadow-card: 0 0 0 1px rgba(0,0,0,0.04), 0 4px 24px rgba(0,0,0,0.06);
    --shadow-glow: 0 0 60px rgba(75,123,255,0.08);
    --transition: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    color: var(--text-secondary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    line-height: 1.7;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font: inherit; }
::selection { background: var(--accent); color: #fff; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 28px; }

.h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); font-weight: 800; line-height: 1.12; letter-spacing: -0.03em; color: var(--text-primary); }
.h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; color: var(--text-primary); }
.h3 { font-size: 1.1rem; font-weight: 600; line-height: 1.35; color: var(--text-primary); }
.body-lg { font-size: 1.05rem; line-height: 1.7; color: var(--text-secondary); }
.body { font-size: 0.9375rem; line-height: 1.7; color: var(--text-secondary); }

.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .body { max-width: 520px; margin: 12px auto 0; }
.section-label {
    display: inline-block; padding: 5px 14px; border-radius: 100px;
    font-size: 0.75rem; font-weight: 600;
    background: var(--accent-subtle); color: var(--accent);
    margin-bottom: 16px; letter-spacing: 0.02em;
}

.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Nav */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,0.82);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}
.nav.scrolled { background: rgba(255,255,255,0.95); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; color: var(--text-primary); letter-spacing: -0.01em; }
.nav-logo-icon { width: 30px; height: 30px; background: var(--accent); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.8rem; box-shadow: 0 0 20px var(--shadow-glow); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { font-size: 0.875rem; font-weight: 500; color: var(--text-secondary); transition: color 0.25s; position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px; background: var(--accent); transform: scaleX(0); transition: transform 0.3s; }
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after { transform: scaleX(1); }
.btn-nav { display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px; border-radius: var(--radius-sm); font-size: 0.8125rem; font-weight: 600; background: var(--accent); color: #fff; transition: all 0.25s; box-shadow: 0 4px 16px rgba(75,123,255,0.20); }
.btn-nav:hover { background: var(--accent-hover); box-shadow: 0 4px 16px rgba(75,123,255,0.25); }
.nav-toggle { display: none; background: none; border: none; font-size: 1.25rem; color: var(--text-secondary); }
.mobile-menu { max-height: 0; overflow: hidden; transition: max-height 0.4s; }
.mobile-menu.open { max-height: 400px; }
.mobile-menu a { display: block; padding: 12px 0; font-size: 0.9375rem; color: var(--text-secondary); border-bottom: 1px solid var(--border); }

@media (max-width: 768px) { .nav-links { display: none; } .nav-toggle { display: block; } }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: var(--radius-sm);
    font-size: 0.875rem; font-weight: 600;
    transition: all 0.3s; border: none;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 16px rgba(75,123,255,0.20); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(75,123,255,0.30); }
.btn-ghost { background: transparent; border: 1px solid var(--border-active); color: var(--text-primary); }
.btn-ghost:hover { border-color: var(--accent); background: var(--accent-subtle); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 0.8125rem; }

/* Download Hero */
.download-hero {
    padding: 120px 0 60px;
    position: relative; overflow: hidden; text-align: center;
    background: linear-gradient(180deg, #FFFFFF 0%, #FFFFFF 50%, var(--bg-deep) 100%);
}
.download-hero-bg {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(0,0,0,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(0,0,0,0.04) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 70% 50% at 50% 40%, #000, transparent);
    -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 40%, #000, transparent);
}
.download-hero .hero-orb {
    position: absolute; border-radius: 50%; filter: blur(100px); pointer-events: none;
}
.download-hero .hero-orb-1 { width: 500px; height: 500px; background: rgba(75,123,255,0.06); top: -150px; right: -50px; animation: orb-drift 25s ease-in-out infinite; }
.download-hero .hero-orb-2 { width: 350px; height: 350px; background: rgba(124,58,237,0.05); bottom: -100px; left: -80px; animation: orb-drift 30s ease-in-out infinite reverse; }
@keyframes orb-drift {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(40px, -60px); }
    66% { transform: translate(-30px, 40px); }
}
.download-hero .h1 { margin-bottom: 12px; }
.download-hero .h1 .highlight {
    background: linear-gradient(135deg, var(--accent) 0%, #A78BFA 50%, var(--accent-cyan) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.download-hero-inner { position: relative; z-index: 1; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 28px 0; }

/* Notice banner */
.notice-banner {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 10px 20px; border-radius: var(--radius-sm);
    background: rgba(217,119,6,0.08); color: var(--accent-amber);
    font-size: 0.85rem; font-weight: 500;
    margin-bottom: 8px;
}
.notice-banner i { font-size: 1rem; flex-shrink: 0; }

/* Video buttons */
.video-btns { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 12px; }
.btn-video {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 22px; border-radius: var(--radius-sm);
    font-size: 0.9rem; font-weight: 600; color: #fff;
    background: linear-gradient(135deg, #EF4444, #F97316);
    transition: all 0.3s;
}
.btn-video:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(239,68,68,0.25); }
.btn-doc {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius-sm);
    font-size: 0.95rem; font-weight: 600; color: #fff;
    background: var(--accent); box-shadow: 0 4px 16px rgba(75,123,255,0.20);
    transition: all 0.3s;
}
.btn-doc:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(75,123,255,0.30); }

/* Version Card */
.version-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: var(--transition);
}
.version-card:hover { border-color: var(--border-active); box-shadow: var(--shadow-card); }
.version-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.version-title { font-size: 1.3rem; font-weight: 700; color: var(--text-primary); }
.version-date { font-size: 0.85rem; color: var(--text-muted); margin-top: 2px; }

/* Prereq notice */
.prereq-notice {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 12px 16px; border-radius: var(--radius-sm);
    background: rgba(217,119,6,0.06); color: var(--accent-amber);
    font-size: 0.85rem; margin-bottom: 24px;
}
.prereq-notice i { margin-top: 3px; flex-shrink: 0; }

/* Download Table */
.dl-table-wrap { overflow-x: auto; }
.dl-table { width: 100%; border-collapse: collapse; }
.dl-table th {
    text-align: left; padding: 12px 20px;
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--bg-elevated); color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
.dl-table td {
    padding: 14px 20px; font-size: 0.875rem;
    border-bottom: 1px solid var(--border); color: var(--text-secondary);
}
.dl-table tr:last-child td { border-bottom: none; }
.dl-table tr:hover td { background: var(--bg-elevated); }
.dl-table td:first-child { font-weight: 600; color: var(--text-primary); }
.btn-dl {
    padding: 6px 16px; border-radius: var(--radius-sm);
    font-size: 0.8rem; font-weight: 600;
    background: var(--accent); color: #fff; border: none; cursor: pointer;
    transition: all 0.25s;
}
.btn-dl:hover { background: var(--accent-hover); transform: translateY(-1px); }

/* Dep cards */
.dep-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 820px; margin: 0 auto; }
.dep-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: var(--transition);
}
.dep-card:hover { border-color: var(--border-active); box-shadow: var(--shadow-card); }
.dep-card-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.dep-card-icon {
    width: 46px; height: 46px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; flex-shrink: 0;
}
.dep-card h3 { font-size: 1rem; }
.dep-card .sub { font-size: 0.8125rem; color: var(--text-muted); }
.dep-card .desc { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 14px; }
.dep-links { display: flex; flex-direction: column; gap: 8px; }
.dep-link {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    font-size: 0.85rem; color: var(--text-secondary);
    transition: var(--transition);
}
.dep-link:hover { border-color: var(--accent); background: var(--accent-subtle); }
.dep-link-inner { display: flex; align-items: center; gap: 10px; }
.dep-link-icon {
    width: 28px; height: 28px; border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem; flex-shrink: 0;
}
.dep-link .ext-icon { color: var(--text-muted); font-size: 0.8rem; }

@media (max-width: 720px) { .dep-grid { grid-template-columns: 1fr; } }

/* Dep notice */
.dep-notice {
    max-width: 820px; margin: 24px auto 0;
    display: flex; align-items: flex-start; gap: 12px;
    padding: 16px 20px; border-radius: var(--radius-sm);
    background: rgba(217,119,6,0.06);
}
.dep-notice i { color: var(--accent-amber); margin-top: 3px; flex-shrink: 0; font-size: 1.1rem; }
.dep-notice h4 { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.dep-notice ul { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.dep-notice ul li { font-size: 0.8125rem; color: var(--text-secondary); display: flex; align-items: flex-start; gap: 6px; }
.dep-notice ul li i { font-size: 0.35rem; color: var(--accent-amber); margin-top: 7px; }

/* Docker */
.docker-wrap { display: flex; flex-direction: column; gap: 24px; }
.split-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: start; }
.split-layout > div { min-width: 0; }
@media (max-width: 960px) { .split-layout { grid-template-columns: 1fr; gap: 40px; } }
@media (max-width: 720px) { .docker-wrap { gap: 20px; } }

/* Modal */
.modal-overlay {
    position: fixed; inset: 0; z-index: 200;
    background: rgba(0,0,0,0.45);
    display: none; align-items: center; justify-content: center;
    padding: 20px;
}
.modal-box {
    background: var(--bg-card); border-radius: var(--radius-lg);
    width: 100%; max-width: 520px;
    padding: 32px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    max-height: 90vh; overflow-y: auto;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.modal-header h3 { font-size: 1.1rem; font-weight: 600; color: var(--text-primary); }
.modal-close { background: none; border: none; font-size: 1.1rem; color: var(--text-muted); transition: color 0.2s; }
.modal-close:hover { color: var(--text-primary); }
.modal-body { margin-bottom: 24px; }

/* Download sources in modal */
.dl-source-list { display: flex; flex-direction: column; gap: 12px; }
.dl-source-item {
    display: flex; align-items: center; gap: 14px;
    padding: 14px 18px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    transition: var(--transition);
}
.dl-source-item:hover { border-color: var(--accent); background: var(--accent-subtle); }
.dl-source-icon {
    width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; flex-shrink: 0;
}
.dl-source-item h4 { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); flex: 1; }
.dl-source-item .arrow { color: var(--accent); font-size: 0.9rem; }

/* Info block in modal */
.info-block {
    padding: 16px 20px; border-radius: var(--radius-sm);
    margin-bottom: 20px;
}
.info-block.blue { background: rgba(75,123,255,0.06); }
.info-block h4 { font-size: 0.9rem; font-weight: 600; color: var(--accent); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.info-block p { font-size: 0.8125rem; color: var(--text-secondary); line-height: 1.7; }
.info-block .text-accent { color: var(--accent); font-weight: 600; }
.info-block .text-red { color: var(--accent-rose); font-weight: 600; }
.info-block .text-green { color: var(--accent-cyan); font-weight: 600; }
.info-block ul { list-style: none; margin-top: 6px; display: flex; flex-direction: column; gap: 4px; }
.info-block ul li { font-size: 0.8125rem; color: var(--text-secondary); display: flex; align-items: flex-start; gap: 6px; margin-left: 12px; }
.info-block ul li i { font-size: 0.35rem; color: var(--accent-cyan); margin-top: 7px; flex-shrink: 0; }
.info-block a { color: var(--accent-purple); font-weight: 500; }
.info-block a:hover { text-decoration: underline; }

/* Footer */
.footer {
    background: #F0F2F6; border-top: 1px solid var(--border);
    padding: 60px 0 36px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand-icon { width: 28px; height: 28px; background: var(--accent); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.75rem; box-shadow: 0 0 16px rgba(75,123,255,0.15); }
.footer-brand span { font-weight: 700; font-size: 1rem; color: var(--text-primary); }
.footer .desc { font-size: 0.8125rem; color: var(--text-secondary); max-width: 320px; line-height: 1.7; }
.footer .social { display: flex; gap: 14px; margin-top: 20px; }
.footer .social a { width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; font-size: 0.9rem; color: var(--text-secondary); transition: var(--transition); }
.footer .social a:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
.footer h4 { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-primary); margin-bottom: 18px; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 0.8125rem; color: var(--text-secondary); transition: color 0.25s; }
.footer-links a:hover { color: var(--text-secondary); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 44px; padding-top: 24px; text-align: center; font-size: 0.75rem; color: var(--text-secondary); }
.footer-bottom a { color: inherit; }
.footer-bottom a:hover { color: var(--text-secondary); }

@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }