:root {
  --brand: #1a56db;
  --brand-dark: #133d99;
  --brand-light: #e8f0fe;
  --accent: #ff6b35;
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --text: #1a2233;
  --text-soft: #4a5568;
  --text-muted: #718096;
  --border: #e2e8f0;
  --success: #16a34a;
  --shadow-sm: 0 1px 3px rgba(26, 34, 51, 0.06);
  --shadow: 0 4px 20px rgba(26, 34, 51, 0.08);
  --radius: 12px;
  --radius-lg: 18px;
  --maxw: 1180px;
  --navh: 68px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font-sans); color: var(--text); background: var(--bg); line-height: 1.7; font-size: 16px; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.3; color: var(--text); margin: 0 0 .6em; font-weight: 700; }
h1 { font-size: clamp(28px, 4.2vw, 44px); letter-spacing: -0.01em; }
h2 { font-size: clamp(22px, 3vw, 32px); }
h3 { font-size: 20px; }
p { margin: 0 0 1em; color: var(--text-soft); }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.site-nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.nav-inner { height: var(--navh); display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--text); font-size: 20px; }
.brand-mark { width: 32px; height: 32px; border-radius: 9px; background: linear-gradient(135deg, var(--brand), #4f8cff); display: grid; place-items: center; color: #fff; font-weight: 900; font-size: 16px; }
.nav-links { display: flex; align-items: center; gap: 8px; list-style: none; padding: 0; margin: 0; }
.nav-links a { display: inline-block; padding: 8px 14px; border-radius: 8px; color: var(--text-soft); font-weight: 500; font-size: 15px; }
.nav-links a:hover { background: var(--brand-light); color: var(--brand); text-decoration: none; }
.nav-links a.btn { background: var(--brand); color: #fff; }
.nav-links a.btn:hover { background: var(--brand-dark); color: #fff; }
@media (max-width: 780px) { .nav-links .hide-sm { display: none; } }
.btn { display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 15px; transition: transform .15s, background .15s; cursor: pointer; border: 0; }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 6px 18px rgba(26,86,219,.3); }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-1px); text-decoration: none; color: #fff; }
.btn-ghost { background: #fff; color: var(--brand); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--brand); background: var(--brand-light); text-decoration: none; }
.btn-lg { padding: 16px 28px; font-size: 16px; border-radius: 12px; }
.hero { padding: 96px 0 80px; background: radial-gradient(1200px 500px at 85% -10%, rgba(79,140,255,.25), transparent 60%), radial-gradient(900px 450px at -10% 10%, rgba(255,107,53,.18), transparent 60%), linear-gradient(180deg, #f6f9ff 0%, #ffffff 100%); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 40px; } }
.eyebrow { display: inline-block; padding: 6px 12px; border-radius: 999px; background: var(--brand-light); color: var(--brand); font-weight: 600; font-size: 13px; margin-bottom: 18px; }
.hero h1 span { color: var(--brand); }
.hero-lead { font-size: 18px; color: var(--text-soft); margin-bottom: 28px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 10px; }
.hero-facts { display: flex; gap: 28px; margin-top: 32px; flex-wrap: wrap; color: var(--text-muted); font-size: 14px; }
.hero-facts strong { color: var(--text); font-size: 20px; display: block; }
.hero-visual { position: relative; aspect-ratio: 4/3; background: linear-gradient(135deg, #1a56db 0%, #4f8cff 100%); border-radius: 24px; overflow: hidden; box-shadow: 0 20px 60px rgba(26,86,219,.3); color: #fff; }
.hero-visual::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 20% 30%, rgba(255,255,255,.35), transparent 40%), radial-gradient(circle at 80% 70%, rgba(255,107,53,.4), transparent 40%); }
.hero-visual .visual-card { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); background: rgba(255,255,255,.14); backdrop-filter: blur(6px); border: 1px solid rgba(255,255,255,.25); padding: 22px 26px; border-radius: 16px; text-align: center; min-width: 240px; }
.hero-visual .visual-card .ms { font-size: 48px; font-weight: 800; }
.hero-visual .visual-card .lbl { font-size: 13px; opacity: .9; letter-spacing: .1em; }
.hero-visual .visual-chip { position: absolute; background: rgba(255,255,255,.18); padding: 8px 14px; border-radius: 999px; font-size: 12px; border: 1px solid rgba(255,255,255,.3); }
.chip-1 { top: 18px; left: 18px; }
.chip-2 { bottom: 18px; right: 18px; }
.chip-3 { top: 50%; right: -20px; transform: translateY(-50%); }
.chip-4 { bottom: 30px; left: 20px; }
.section { padding: 88px 0; position: relative; }
.section-alt { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-head .eyebrow { margin-bottom: 14px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 860px) { .steps { grid-template-columns: 1fr; } }
.step { background: #fff; border-radius: var(--radius-lg); padding: 36px 30px; border: 1px solid var(--border); box-shadow: var(--shadow-sm); position: relative; transition: transform .2s, box-shadow .2s; }
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.step-num { position: absolute; top: -18px; left: 30px; width: 36px; height: 36px; border-radius: 50%; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 700; box-shadow: 0 4px 12px rgba(26,86,219,.35); }
.step-icon { width: 56px; height: 56px; border-radius: 14px; background: var(--brand-light); color: var(--brand); display: grid; place-items: center; margin-bottom: 18px; font-size: 26px; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
@media (max-width: 980px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .cards { grid-template-columns: 1fr; } }
.card { background: #fff; border-radius: var(--radius-lg); padding: 28px 24px; border: 1px solid var(--border); transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card .icon { width: 52px; height: 52px; border-radius: 14px; background: linear-gradient(135deg, var(--brand), #4f8cff); color: #fff; display: grid; place-items: center; font-size: 24px; margin-bottom: 16px; }
.card .platforms { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--border); font-size: 13px; color: var(--text-muted); }
.card .platforms strong { color: var(--text); }
.card .more { display: inline-block; margin-top: 14px; font-weight: 600; font-size: 14px; }
.perf-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .perf-grid { grid-template-columns: 1fr; } }
.perf-table { width: 100%; border-collapse: separate; border-spacing: 0; background: #fff; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.perf-table th, .perf-table td { padding: 18px 22px; text-align: left; border-bottom: 1px solid var(--border); font-size: 15px; }
.perf-table thead th { background: var(--brand); color: #fff; font-weight: 600; border-bottom: 0; }
.perf-table tbody tr:last-child td { border-bottom: 0; }
.perf-table td .before { color: #dc2626; font-weight: 600; }
.perf-table td .after { color: var(--success); font-weight: 700; }
.perf-highlight { text-align: center; padding: 40px; border-radius: var(--radius-lg); background: linear-gradient(135deg, rgba(26,86,219,.08), rgba(79,140,255,.04)); border: 1px solid rgba(26,86,219,.18); }
.perf-highlight .big { font-size: 72px; font-weight: 800; color: var(--brand); line-height: 1; letter-spacing: -.02em; }
.perf-highlight .label { color: var(--text-soft); font-size: 15px; }
.perf-highlight .sub { margin-top: 18px; color: var(--text-muted); font-size: 14px; }
.faq-wrap { max-width: 880px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin-bottom: 14px; transition: box-shadow .2s; }
.faq-item[open] { box-shadow: var(--shadow); }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 16px; display: flex; justify-content: space-between; align-items: center; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 22px; color: var(--brand); }
.faq-item[open] summary::after { content: "-"; }
.faq-item .ans { margin-top: 14px; color: var(--text-soft); }
.faq-item .ans p { margin-bottom: 10px; }
.trust-bar { margin-top: 56px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 36px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); }
@media (max-width: 860px) { .trust-bar { grid-template-columns: repeat(2, 1fr); } }
.trust-item { text-align: center; }
.trust-item .num { font-size: 36px; font-weight: 800; color: var(--brand); line-height: 1; }
.trust-item .lbl { color: var(--text-muted); font-size: 14px; margin-top: 6px; }
.cta-final { padding: 84px 0; background: linear-gradient(135deg, #1a56db 0%, #2f6fe8 50%, #4f8cff 100%); color: #fff; }
.cta-final h2 { color: #fff; }
.cta-final p { color: rgba(255,255,255,.9); font-size: 18px; max-width: 620px; margin: 0 auto 28px; text-align: center; }
.cta-final .btn-primary { background: #fff; color: var(--brand); box-shadow: 0 10px 28px rgba(0,0,0,.2); }
.cta-final .btn-primary:hover { background: #f0f4ff; color: var(--brand-dark); }
.cta-final .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.cta-final .btn-ghost:hover { background: rgba(255,255,255,.1); color: #fff; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.site-foot { background: #0f172a; color: #9aa4b8; padding: 56px 0 28px; }
.site-foot h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.site-foot a { color: #c3ccdd; }
.site-foot a:hover { color: #fff; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
@media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
.foot-col ul { list-style: none; padding: 0; margin: 0; }
.foot-col ul li { margin-bottom: 10px; font-size: 14px; }
.foot-brand p { color: #9aa4b8; font-size: 14px; max-width: 340px; }
.foot-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.08); text-align: center; color: #6b7a95; font-size: 13px; }
.page-hero { padding: 72px 0 48px; background: radial-gradient(800px 360px at 90% -20%, rgba(79,140,255,.25), transparent 60%), linear-gradient(180deg, #f6f9ff 0%, #ffffff 100%); border-bottom: 1px solid var(--border); }
.page-hero h1 { margin-bottom: 14px; }
.page-hero p { font-size: 18px; color: var(--text-soft); max-width: 720px; }
.breadcrumb { color: var(--text-muted); font-size: 13px; margin-bottom: 14px; }
.breadcrumb a { color: var(--text-muted); }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; border-bottom: 1px solid var(--border); padding-bottom: 16px; }
.tab-btn { padding: 10px 20px; border-radius: 999px; border: 1px solid var(--border); background: #fff; color: var(--text-soft); font-weight: 600; font-size: 14px; cursor: pointer; }
.tab-btn[aria-expanded="true"], .tab-btn:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.node-list { display: grid; grid-template-columns: 1fr; gap: 20px; }
.node-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px 30px; box-shadow: var(--shadow-sm); }
.node-head { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; flex-wrap: wrap; }
.node-title { font-size: 20px; font-weight: 700; color: var(--text); }
.node-meta { display: flex; gap: 10px; flex-wrap: wrap; font-size: 13px; }
.pill { display: inline-block; padding: 4px 12px; border-radius: 999px; background: var(--brand-light); color: var(--brand); font-weight: 600; }
.pill.ok { background: #dcfce7; color: var(--success); }
.pill.warn { background: #fef3c7; color: #b45309; }
.node-resources { list-style: none; padding: 0; margin: 0 0 18px; }
.node-resources li { padding: 10px 0; border-bottom: 1px dashed var(--border); display: flex; justify-content: space-between; gap: 20px; font-size: 14px; }
.node-resources li:last-child { border-bottom: 0; }
.node-resources .r-name { font-weight: 600; color: var(--text); }
.node-resources .r-desc { color: var(--text-muted); }
.help-hero-links { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 16px; }
.help-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
@media (max-width: 900px) { .help-grid { grid-template-columns: 1fr; } }
.help-group h2 { font-size: 22px; margin-bottom: 20px; }
.help-group { margin-bottom: 48px; }
.tutorial { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; }
.tutorial summary { cursor: pointer; padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: 16px; background: #fafbff; }
.tutorial summary::-webkit-details-marker { display: none; }
.tutorial summary::after { content: "+"; color: var(--brand); font-size: 22px; }
.tutorial[open] summary::after { content: "-"; }
.tutorial .t-content { padding: 20px 24px; border-top: 1px solid var(--border); }
.tutorial ol, .tutorial ul { padding-left: 22px; }
.tutorial li { margin-bottom: 8px; color: var(--text-soft); }
.tutorial .note { background: var(--brand-light); color: var(--brand-dark); padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-top: 16px; }
.tutorial .troubleshoot { background: #fff7ed; color: #9a3412; padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-top: 16px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-info h2 { margin-bottom: 24px; }
.contact-info ul { list-style: none; padding: 0; }
.contact-info ul li { padding: 18px 0; border-bottom: 1px solid var(--border); display: flex; gap: 16px; align-items: flex-start; }
.contact-info .c-ic { width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0; background: var(--brand-light); color: var(--brand); display: grid; place-items: center; font-size: 20px; }
.contact-info h4 { font-size: 15px; margin-bottom: 2px; }
.contact-info p { color: var(--text-muted); font-size: 14px; margin: 0; }
.contact-form { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px; box-shadow: var(--shadow-sm); }
.form-row { margin-bottom: 20px; }
.form-row label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 8px; color: var(--text); }
.form-row input, .form-row select, .form-row textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; font-family: inherit; font-size: 15px; color: var(--text); background: #fafbff; transition: border-color .15s; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(26,86,219,.12); background: #fff; }
.form-row textarea { min-height: 130px; resize: vertical; }
.text-center { text-align: center; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.cards .card-list { margin: 12px 0 0; padding-left: 0; list-style: none; }
.cards .card-list li { padding: 6px 0 6px 18px; position: relative; color: var(--text-soft); font-size: 14px; line-height: 1.55; }
.cards .card-list li::before { content: ""; position: absolute; left: 0; top: 13px; width: 6px; height: 6px; border-radius: 50%; background: var(--brand); }
.hero-stats { display: flex; gap: 32px; list-style: none; padding: 0; margin: 24px 0 0; flex-wrap: wrap; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 28px; color: var(--brand); font-weight: 800; }
.hero-stats li { font-size: 14px; color: var(--text-soft); }
.perf-list { margin: 16px 0 0; padding-left: 0; list-style: none; }
.perf-list li { padding: 8px 0 8px 28px; position: relative; color: var(--text-soft); font-size: 14px; line-height: 1.55; }
.note { padding: 12px 16px; background: var(--brand-light); border-radius: 10px; margin-top: 16px; font-size: 14px; color: var(--text-soft); line-height: 1.6; }
.troubleshoot { padding: 14px 16px; background: #fff7ed; border: 1px solid #fed7aa; border-radius: 10px; margin-top: 16px; font-size: 14px; color: #7c2d12; line-height: 1.6; }
.help-hero-links { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } html { scroll-behavior: auto; } }