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

:root {
    --bg-primary: #030508;
    --bg-secondary: #080c14;
    --bg-card: #0c1018;
    --bg-card-hover: #111828;
    --accent: #2563eb;
    --accent-light: #60a5fa;
    --accent-glow: rgba(37, 99, 235, 0.35);
    --accent2: #f59e0b;
    --accent2-glow: rgba(245, 158, 11, 0.25);
    --text-primary: #eef2ff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: rgba(37, 99, 235, 0.2);
    --border-hover: rgba(96, 165, 250, 0.5);
    --radius: 12px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(3, 5, 8, 0.88);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0 40px;
}
.nav-inner {
    max-width: 1280px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.nav-logo {
    font-size: 1.3rem; font-weight: 800;
    color: #fff;
    letter-spacing: -0.5px;
    display: flex; align-items: center; gap: 10px;
    text-decoration: none;
}
.nav-logo .logo-icon {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border-radius: 9px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem;
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: #fff; }
.nav-cta {
    background: linear-gradient(135deg, var(--accent), #1d4ed8);
    color: #fff !important;
    padding: 8px 22px;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}
.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    text-align: center;
    padding: 120px 20px 80px;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse 55% 45% at 50% 0%, rgba(37, 99, 235, 0.22) 0%, transparent 70%),
        radial-gradient(ellipse 35% 35% at 80% 70%, rgba(245, 158, 11, 0.08) 0%, transparent 60%);
    pointer-events: none;
}
.hero-grid {
    position: absolute; inset: 0; pointer-events: none;
    background-image:
        linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, #000 20%, transparent 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 860px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(37, 99, 235, 0.12);
    border: 1px solid var(--border);
    padding: 6px 18px;
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--accent-light);
    margin-bottom: 28px;
    animation: fadeSlideDown 0.8s ease;
}
.hero-badge .dot {
    width: 7px; height: 7px;
    background: var(--accent2);
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}
.hero h1 {
    font-size: clamp(2.6rem, 6.5vw, 4.8rem);
    font-weight: 900;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 16px;
    animation: fadeSlideDown 0.8s ease 0.1s both;
}
.hero h1 .line2 {
    display: block;
    margin-top: 8px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-light) 45%, var(--accent2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-sub {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto 40px;
    animation: fadeSlideDown 0.8s ease 0.2s both;
}
.hero-buttons {
    display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
    animation: fadeSlideDown 0.8s ease 0.3s both;
}
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    background: linear-gradient(135deg, var(--accent), #1d4ed8);
    color: #fff; padding: 14px 32px;
    border-radius: 10px; border: none; cursor: pointer;
    font-size: 1rem; font-weight: 700;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
}
.btn-secondary {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    padding: 14px 28px; border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 1rem; font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--border-hover);
}

section { padding: 100px 20px; }
.container { max-width: 1200px; margin: 0 auto; }
.section-label {
    font-size: 0.78rem; font-weight: 700; letter-spacing: 3px;
    text-transform: uppercase; color: var(--accent-light);
    margin-bottom: 12px;
}
.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 900; letter-spacing: -1px;
    margin-bottom: 16px;
}
.section-desc { color: var(--text-secondary); font-size: 1.05rem; max-width: 580px; }

.features { background: var(--bg-secondary); }
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 56px;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}
.feature-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.12);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
    width: 48px; height: 48px;
    background: rgba(37, 99, 235, 0.12);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem; margin-bottom: 20px;
}
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.8; }

.platforms { background: var(--bg-primary); }
.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 56px;
}
.platform-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    text-align: center;
    transition: all 0.3s;
}
.platform-card:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(37, 99, 235, 0.15);
}
.platform-card .picon { font-size: 2.6rem; margin-bottom: 16px; display: block; }
.platform-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 6px; }
.platform-card p { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 22px; }
.plat-btn {
    display: inline-flex; align-items: center; gap: 6px;
    background: linear-gradient(135deg, var(--accent), #1d4ed8);
    color: #fff; padding: 10px 24px;
    border-radius: 8px; border: none; cursor: pointer;
    font-size: 0.88rem; font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}
.plat-btn:hover { transform: scale(1.04); box-shadow: 0 6px 18px var(--accent-glow); }

.articles-preview { background: var(--bg-secondary); }
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
    margin-top: 48px;
}
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
    display: block;
}
.article-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.12);
}
.article-card .article-date { font-size: 0.78rem; color: var(--accent2); margin-bottom: 10px; }
.article-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.article-card p { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; }
.article-card .read-more { color: var(--accent-light); font-size: 0.85rem; margin-top: 14px; display: inline-block; }

.faq-section { background: var(--bg-primary); }
.faq-list { margin-top: 48px; max-width: 760px; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 0;
    cursor: pointer;
    font-weight: 700; font-size: 1rem;
    color: var(--text-primary);
    gap: 16px;
}
.faq-q:hover { color: var(--accent-light); }
.faq-icon { transition: transform 0.3s; font-size: 1.2rem; color: var(--accent-light); flex-shrink: 0; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
    max-height: 0; overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s;
    color: var(--text-secondary); font-size: 0.9rem; line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding-bottom: 20px; }

.cta-section {
    background: linear-gradient(135deg, #020617 0%, #0f172a 50%, #1e1b4b 100%);
    border-top: 1px solid var(--border);
    text-align: center;
}
.cta-section h2 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900; letter-spacing: -1px;
    margin-bottom: 18px;
}
.cta-section p { color: var(--text-secondary); font-size: 1.1rem; max-width: 520px; margin: 0 auto 36px; }

footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: 56px 20px 32px;
}
.footer-grid {
    max-width: 1200px; margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}
.footer-brand p { color: var(--text-muted); font-size: 0.85rem; line-height: 1.7; margin-top: 12px; }
.footer-col h4 { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 2px; color: var(--text-muted); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--text-secondary); text-decoration: none; font-size: 0.88rem; margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom {
    max-width: 1200px; margin: 0 auto;
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
}
.footer-bottom p { color: var(--text-muted); font-size: 0.8rem; }

.page-hero {
    padding: 140px 20px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.page-hero::before {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(ellipse 60% 50% at 50% 0%, rgba(37, 99, 235, 0.2) 0%, transparent 70%);
    pointer-events: none;
}
.page-hero-inner { position: relative; z-index: 2; max-width: 720px; margin: 0 auto; }
.version-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    padding: 5px 16px; border-radius: 50px;
    font-size: 0.8rem; color: var(--accent2);
    margin-bottom: 24px;
    font-weight: 600;
}
.page-hero h1 {
    font-size: clamp(2.2rem, 5.5vw, 3.6rem);
    font-weight: 900; letter-spacing: -2px; line-height: 1.1;
    margin-bottom: 18px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-light) 60%, var(--accent2) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.page-hero p { color: var(--text-secondary); font-size: 1.05rem; max-width: 560px; margin: 0 auto 32px; }

.platform-tabs {
    display: flex; justify-content: center; gap: 8px;
    margin-bottom: 48px; flex-wrap: wrap;
}
.tab-btn {
    padding: 9px 24px; border-radius: 8px; border: 1px solid var(--border);
    background: var(--bg-card); color: var(--text-secondary);
    font-size: 0.88rem; font-weight: 600; cursor: pointer; transition: all 0.25s;
}
.tab-btn:hover { border-color: var(--border-hover); color: var(--text-primary); }
.tab-btn.active {
    background: linear-gradient(135deg, var(--accent), #1d4ed8);
    border-color: var(--accent); color: #fff;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.dl-section { padding: 20px 20px 100px; }
.dl-container { max-width: 960px; margin: 0 auto; }
.dl-platform-group { display: none; }
.dl-platform-group.active { display: block; }
.dl-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    margin-bottom: 24px;
    transition: all 0.3s;
}
.dl-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 12px 48px rgba(37, 99, 235, 0.15);
    transform: translateY(-3px);
}
.dl-header { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 28px; }
.dl-icon { font-size: 2.8rem; flex-shrink: 0; }
.dl-info h2 { font-size: 1.3rem; font-weight: 800; margin-bottom: 4px; }
.dl-info .dl-sub { color: var(--text-secondary); font-size: 0.88rem; }
.dl-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.chip {
    display: inline-flex; align-items: center; gap: 4px;
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.15);
    color: var(--accent2);
    padding: 2px 10px; border-radius: 50px;
    font-size: 0.72rem; font-weight: 600;
}
.dl-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.dl-btn {
    display: inline-flex; align-items: center; gap: 8px;
    background: linear-gradient(135deg, var(--accent), #1d4ed8);
    color: #fff; padding: 12px 28px;
    border-radius: 8px; text-decoration: none;
    font-size: 0.92rem; font-weight: 700;
    transition: all 0.2s;
}
.dl-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--accent-glow); }
.dl-btn.secondary {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    font-weight: 600;
}
.dl-req { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }
.dl-req h4 { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 1px; }
.dl-req ul { list-style: none; }
.dl-req li { color: var(--text-secondary); font-size: 0.88rem; padding: 4px 0; }
.dl-req li::before { content: '✓ '; color: var(--accent2); }

.update-list {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-top: 40px;
}
.update-list h3 { font-size: 1.15rem; margin-bottom: 16px; }
.update-list ul { list-style: none; }
.update-list li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}
.update-list li:last-child { border-bottom: none; }
.update-list li::before { content: '• '; color: var(--accent-light); }

.article-page { padding: 120px 20px 80px; }
.article-container { max-width: 780px; margin: 0 auto; }
.article-meta { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 24px; }
.article-container h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 900; letter-spacing: -1px;
    margin-bottom: 28px; line-height: 1.2;
}
.article-container h2 {
    font-size: 1.35rem; font-weight: 800;
    margin: 36px 0 14px; color: var(--text-primary);
}
.article-container p { color: var(--text-secondary); margin-bottom: 18px; line-height: 1.85; }
.article-container ul, .article-container ol {
    color: var(--text-secondary);
    margin: 0 0 18px 24px;
    line-height: 1.85;
}
.article-container li { margin-bottom: 8px; }
.article-container code {
    background: rgba(37, 99, 235, 0.12);
    padding: 2px 8px; border-radius: 4px;
    font-size: 0.88rem; color: var(--accent-light);
}
.article-container pre {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin-bottom: 18px;
}
.article-container pre code { background: none; padding: 0; color: var(--text-primary); }
.breadcrumb { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--accent-light); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.sitemap-page { padding: 120px 20px 80px; }
.sitemap-list { margin-top: 40px; max-width: 720px; }
.sitemap-group { margin-bottom: 36px; }
.sitemap-group h2 { font-size: 1.2rem; margin-bottom: 16px; color: var(--accent-light); }
.sitemap-group ul { list-style: none; }
.sitemap-group li { margin-bottom: 10px; }
.sitemap-group a { color: var(--text-secondary); text-decoration: none; font-size: 0.95rem; }
.sitemap-group a:hover { color: var(--accent-light); }

.particles { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.particle {
    position: absolute;
    border-radius: 50%;
    animation: float-particle linear infinite;
    opacity: 0;
}

@keyframes fadeSlideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.7); }
}
@keyframes float-particle {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 0.6; }
    90% { opacity: 0.6; }
    100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

@media (max-width: 768px) {
    .platform-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    nav { padding: 0 20px; }
    .nav-links { gap: 14px; font-size: 0.85rem; }
}
@media (max-width: 600px) {
    .footer-grid { grid-template-columns: 1fr; }
}