:root{
  --bg:#0a0e1a; --bg2:#0f1629; --card:#141c33; --line:rgba(255,255,255,.08);
  --brand:#4f7cff; --brand2:#7aa2ff; --accent:#22d3ee; --text:#e8eefc; --muted:#9aa8c7;
  --radius:18px; --maxw:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;border-radius:999px;padding:14px 28px;transition:.25s;cursor:pointer;border:none;font-size:15px}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;box-shadow:0 10px 30px rgba(79,124,255,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(79,124,255,.5)}
.btn-ghost{background:rgba(255,255,255,.06);color:var(--text);border:1px solid var(--line)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* 顶部导航 */
header{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(10,14,26,.7);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.5px}
.logo-badge{width:34px;height:34px;border-radius:10px;object-fit:cover;display:block}
.nav-links{display:flex;gap:22px;align-items:center;color:var(--muted);font-size:15px}
.nav-links a:hover{color:var(--text)}
.nav-cta{display:flex;gap:10px;align-items:center}
@media(max-width:920px){.nav-links{display:none}}

/* Hero */
.hero{position:relative;padding:84px 0 70px;text-align:center;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(600px 300px at 50% -10%,rgba(79,124,255,.35),transparent 60%),
  radial-gradient(500px 260px at 15% 20%,rgba(34,211,238,.18),transparent 60%),
  radial-gradient(500px 260px at 85% 10%,rgba(122,162,255,.18),transparent 60%);z-index:-1}
.pill{display:inline-flex;gap:8px;align-items:center;padding:7px 16px;border-radius:999px;background:rgba(79,124,255,.12);border:1px solid rgba(79,124,255,.3);color:var(--brand2);font-size:13px;font-weight:600;margin-bottom:24px}
.hero h1{font-size:clamp(30px,5.5vw,56px);line-height:1.15;font-weight:900;letter-spacing:.5px}
.hero h1 .grad{background:linear-gradient(135deg,var(--brand2),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.sub{max-width:720px;margin:22px auto 0;color:var(--muted);font-size:clamp(15px,2vw,19px)}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:36px}
.trust{display:flex;gap:30px;justify-content:center;flex-wrap:wrap;margin-top:44px;color:var(--muted);font-size:14px}
.trust b{color:var(--text);font-size:26px;display:block;font-weight:800}
.trust .grad{background:linear-gradient(135deg,var(--brand2),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* 子页头部(小 hero) */
.page-hero{position:relative;padding:56px 0 40px;text-align:center;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 240px at 50% -20%,rgba(79,124,255,.28),transparent 60%);z-index:-1}
.page-hero h1{font-size:clamp(26px,4vw,42px);font-weight:900}
.page-hero p{color:var(--muted);margin-top:12px;max-width:680px;margin-left:auto;margin-right:auto}
.crumb{font-size:13px;color:var(--muted);padding:16px 0 0}
.crumb a:hover{color:var(--text)}
.crumb a{color:var(--brand2)}

/* 通用 section */
section.blk{padding:72px 0}
.sec-head{text-align:center;max-width:680px;margin:0 auto 48px}
.sec-head h2{font-size:clamp(24px,3.4vw,38px);font-weight:800}
.sec-head p{color:var(--muted);margin-top:12px;font-size:16px}
.kw{color:var(--brand2);font-weight:800}

/* 特性卡片 */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.card{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.25s}
.card:hover{transform:translateY(-4px);border-color:rgba(79,124,255,.5);box-shadow:0 18px 44px rgba(0,0,0,.35)}
.ico{width:52px;height:52px;border-radius:14px;background:rgba(79,124,255,.14);display:grid;place-items:center;font-size:26px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}

/* 平台 */
.platforms{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.plat{flex:1;min-width:160px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px 20px;text-align:center;transition:.25s}
.plat:hover{border-color:rgba(34,211,238,.5);transform:translateY(-4px)}
.plat .pico{font-size:34px;margin-bottom:10px}
.plat b{display:block;font-size:17px}
.plat span{color:var(--muted);font-size:13px}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;counter-reset:s}
.step{position:relative;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px 26px}
.step::before{counter-increment:s;content:counter(s);position:absolute;top:-16px;left:26px;width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;font-weight:900;font-size:18px;color:#fff}
.step h3{margin:14px 0 8px;font-size:18px}
.step p{color:var(--muted);font-size:15px}

/* CTA 区 */
.cta-band{margin:20px auto;max-width:var(--maxw);background:linear-gradient(135deg,rgba(79,124,255,.16),rgba(34,211,238,.12));border:1px solid rgba(79,124,255,.3);border-radius:26px;padding:52px 30px;text-align:center}
.cta-band h2{font-size:clamp(24px,3.4vw,36px);font-weight:900}
.cta-band p{color:var(--muted);margin:14px auto 28px;max-width:560px}

/* FAQ */
details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:0 22px;margin-bottom:12px;transition:.2s}
details[open]{border-color:rgba(79,124,255,.4)}
summary{list-style:none;cursor:pointer;font-weight:700;font-size:17px;padding:20px 0;display:flex;justify-content:space-between;align-items:center}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:24px;color:var(--brand2);transition:.2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);padding:0 0 20px;font-size:15px}

/* 套餐 */
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;align-items:stretch}
.plan{position:relative;background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:20px;padding:32px 26px;display:flex;flex-direction:column}
.plan.hot{border-color:rgba(79,124,255,.65);box-shadow:0 18px 50px rgba(79,124,255,.25)}
.plan .tag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;font-size:12px;font-weight:700;padding:5px 14px;border-radius:999px;white-space:nowrap}
.plan h3{font-size:20px;margin-bottom:6px}
.plan .price{font-size:38px;font-weight:900;margin:8px 0 2px}
.plan .price small{font-size:15px;color:var(--muted);font-weight:600}
.plan .note{color:var(--muted);font-size:13px;margin-bottom:18px}
.plan ul{list-style:none;margin:0 0 22px;padding:0;flex:1}
.plan li{color:var(--muted);font-size:14px;padding:7px 0;border-bottom:1px dashed var(--line);display:flex;gap:8px}
.plan li::before{content:"✓";color:var(--accent);font-weight:900}
.plan .btn{width:100%;justify-content:center}
.plans-note{text-align:center;color:var(--muted);font-size:13px;margin-top:22px}

/* 评价 */
.reviews{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.review{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px}
.review .stars{color:#ffc24b;font-size:15px;letter-spacing:2px;margin-bottom:10px}
.review p{color:var(--text);font-size:15px;margin-bottom:16px;line-height:1.75}
.review .who{display:flex;align-items:center;gap:10px}
.review .ava{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;color:#fff;font-weight:800}
.review .who b{font-size:14px;display:block}
.review .who span{color:var(--muted);font-size:12px}

/* 正文/文章排版 */
.prose{max-width:820px;margin:0 auto;padding:8px 0 10px}
.prose h2{font-size:24px;margin:34px 0 14px;font-weight:800}
.prose h3{font-size:19px;margin:24px 0 10px;font-weight:700;color:var(--brand2)}
.prose p{color:#c8d3ec;margin:12px 0;font-size:16px}
.prose ul,.prose ol{color:#c8d3ec;margin:12px 0 12px 22px;font-size:16px}
.prose li{margin:7px 0}
.prose a{color:var(--brand2);font-weight:700;border-bottom:1px dashed rgba(122,162,255,.5)}
.prose a:hover{color:var(--accent)}
.prose strong{color:var(--text)}
.prose blockquote{border-left:3px solid var(--brand);background:var(--card);padding:14px 18px;border-radius:0 12px 12px 0;margin:18px 0;color:var(--muted)}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:15px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--card);color:var(--text)}
.prose td{color:var(--muted)}
.tip{background:linear-gradient(135deg,rgba(79,124,255,.14),rgba(34,211,238,.1));border:1px solid rgba(79,124,255,.3);border-radius:14px;padding:18px 20px;margin:22px 0}
.tip b{color:var(--text)}

/* 博客列表 */
.post-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.post-card{display:flex;flex-direction:column;background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:16px;padding:26px;transition:.25s}
.post-card:hover{transform:translateY(-4px);border-color:rgba(79,124,255,.5)}
.post-card .date{color:var(--muted);font-size:13px;margin-bottom:8px}
.post-card h3{font-size:19px;margin-bottom:10px}
.post-card p{color:var(--muted);font-size:15px;flex:1}
.post-card .more{color:var(--brand2);font-weight:700;margin-top:14px;font-size:14px}
.post-meta{color:var(--muted);font-size:14px;text-align:center;margin-bottom:6px}

footer{border-top:1px solid var(--line);padding:46px 0 30px;color:var(--muted);font-size:14px;margin-top:40px}
.foot-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;margin-bottom:26px}
.foot-top a{color:var(--muted)}.foot-top a:hover{color:var(--text)}
.foot-col b{color:var(--text);display:block;margin-bottom:10px}
.foot-col a{display:block;margin-bottom:6px}
.copy{border-top:1px solid var(--line);padding-top:20px;text-align:center;font-size:13px;line-height:1.9}
.copy a{color:var(--brand2)}