:root {
  --bg: #07090f;
  --bg-soft: #0c0f17;
  --card: rgba(255,255,255,.04);
  --card-hover: rgba(255,255,255,.07);
  --border: rgba(255,255,255,.09);
  --text: #e8eaf0;
  --muted: #9aa3b2;
  --primary: #3b82f6;
  --cyan: #22d3ee;
  --grad: linear-gradient(135deg,#3b82f6 0%,#22d3ee 100%);
  --radius: 18px;
  --shadow: 0 20px 60px rgba(0,0,0,.45);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 背景光斑 ---------- */
.bg-orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.bg-orbs::before, .bg-orbs::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5;
}
.bg-orbs::before {
  width: 560px; height: 560px; top: -160px; right: -120px;
  background: radial-gradient(circle, rgba(59,130,246,.35), transparent 65%);
}
.bg-orbs::after {
  width: 520px; height: 520px; bottom: -180px; left: -140px;
  background: radial-gradient(circle, rgba(34,211,238,.22), transparent 65%);
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7,9,15,.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.site-header.scrolled { border-bottom-color: var(--border); }
.nav-bar { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: .3px; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-size: 16px; font-weight: 800;
  box-shadow: 0 4px 14px rgba(59,130,246,.45);
}
.nav { display: flex; align-items: center; gap: 30px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14.5px; transition: color .2s; }
.nav a:hover { color: var(--text); }
.nav a.active { color: var(--text); }
.nav .nav-cta {
  padding: 8px 18px; border-radius: 999px; background: var(--grad); color: #fff !important;
  font-weight: 600; box-shadow: 0 4px 16px rgba(59,130,246,.4);
}
.nav .nav-cta:hover { filter: brightness(1.1); }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--border); border-radius: 10px;
  width: 40px; height: 40px; cursor: pointer; color: var(--text); font-size: 18px;
}

/* ---------- Hero ---------- */
.hero { padding: 88px 0 72px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; font-size: 13px; color: var(--cyan);
  background: rgba(34,211,238,.08); border: 1px solid rgba(34,211,238,.25); margin-bottom: 22px;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }
.hero h1 {
  font-size: 58px; line-height: 1.12; font-weight: 800; letter-spacing: -1px; margin-bottom: 18px;
}
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { font-size: 20px; color: var(--muted); margin-bottom: 14px; }
.hero .desc { font-size: 15.5px; color: var(--muted); max-width: 460px; margin-bottom: 32px; }
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 14px; font-size: 15px; font-weight: 600;
  text-decoration: none; transition: transform .2s, box-shadow .2s, filter .2s; border: none; cursor: pointer;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 26px rgba(59,130,246,.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(59,130,246,.55); }
.btn-ghost { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--card-hover); transform: translateY(-2px); }
.hero-stats { display: flex; gap: 36px; margin-top: 42px; }
.hero-stats .stat b { font-size: 24px; display: block; }
.hero-stats .stat span { font-size: 13px; color: var(--muted); }

.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-visual::before {
  content: ""; position: absolute; inset: 8% 12%; border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,.32), transparent 70%); filter: blur(40px); z-index: 0;
}
.hero-phone-img {
  position: relative; z-index: 1; width: min(300px, 80%);
  filter: drop-shadow(0 30px 60px rgba(0,0,0,.55));
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
.float-chip {
  position: absolute; z-index: 2; display: flex; align-items: center; gap: 9px;
  padding: 10px 16px; border-radius: 14px; font-size: 13px; font-weight: 600;
  background: rgba(13,16,23,.82); border: 1px solid var(--border);
  backdrop-filter: blur(10px); box-shadow: var(--shadow); white-space: nowrap;
}
.float-chip .ico { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; background: rgba(59,130,246,.16); color: var(--primary); }
.float-chip small { display: block; font-weight: 400; color: var(--muted); font-size: 11.5px; }
.chip-1 { top: 17%; left: -2%; animation: float 7s ease-in-out infinite; }
.chip-2 { bottom: 20%; right: -2%; animation: float 8s .8s ease-in-out infinite; }

/* ---------- 通用区块 ---------- */
section { padding: 84px 0; }
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 54px; }
.sec-tag { font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--primary); text-transform: uppercase; }
.sec-head h2 { font-size: 34px; margin: 12px 0 14px; letter-spacing: -.5px; }
.sec-head p { color: var(--muted); font-size: 15.5px; }

/* ---------- 特性卡片 ---------- */
.features { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 26px; transition: transform .25s, background .25s, border-color .25s;
  position: relative; overflow: hidden;
}
.feature-card::after {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .3s;
  background: radial-gradient(320px 160px at 20% 0%, rgba(59,130,246,.12), transparent 70%);
}
.feature-card:hover { transform: translateY(-5px); background: var(--card-hover); border-color: rgba(59,130,246,.4); }
.feature-card:hover::after { opacity: 1; }
.f-ico {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; margin-bottom: 18px;
  background: rgba(59,130,246,.14); color: var(--primary); border: 1px solid rgba(59,130,246,.25);
}
.feature-card h3 { font-size: 17.5px; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--muted); }

/* ---------- 使用步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step {
  position: relative; padding: 30px 26px 26px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border);
}
.step-num {
  width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-weight: 800; font-size: 16px; margin-bottom: 16px;
  box-shadow: 0 6px 18px rgba(59,130,246,.4);
}
.step h3 { font-size: 16.5px; margin-bottom: 7px; }
.step p { font-size: 14px; color: var(--muted); }
.step code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px;
  background: rgba(255,255,255,.07); padding: 2px 7px; border-radius: 6px; color: var(--cyan);
}

/* ---------- 下载 ---------- */
.download-card {
  max-width: 760px; margin: 0 auto; text-align: center;
  background: linear-gradient(180deg, rgba(59,130,246,.1), rgba(34,211,238,.04));
  border: 1px solid rgba(59,130,246,.3); border-radius: 26px; padding: 52px 40px;
  position: relative; overflow: hidden;
}
.download-card::before {
  content: ""; position: absolute; top: -120px; left: 50%; transform: translateX(-50%);
  width: 420px; height: 240px; border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,.3), transparent 70%); filter: blur(30px);
}
.download-card h2 { font-size: 27px; margin-bottom: 12px; position: relative; }
.download-card > p { color: var(--muted); margin-bottom: 28px; position: relative; }
.dl-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; position: relative; }
.dl-meta { display: flex; gap: 26px; justify-content: center; margin-top: 26px; flex-wrap: wrap; position: relative; }
.dl-meta span { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.dl-meta b { color: var(--text); }
.dl-note { font-size: 12.5px; color: var(--muted); margin-top: 22px; position: relative; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 720px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px; overflow: hidden;
  transition: border-color .25s;
}
.faq-item[open] { border-color: rgba(59,130,246,.4); }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 17px 22px; font-size: 15px; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 20px; color: var(--primary); transition: transform .25s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 22px 18px; font-size: 14px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 34px 0; margin-top: 20px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-inner p { color: var(--muted); font-size: 13.5px; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { color: var(--muted); font-size: 13.5px; text-decoration: none; }
.footer-links a:hover { color: var(--text); }

/* ---------- 内页文章 ---------- */
.page-main { padding: 64px 0 84px; }
.article { max-width: 780px; margin: 0 auto; }
.article h2 { font-size: 20px; margin: 34px 0 10px; }
.article h2:first-of-type { margin-top: 8px; }
.article p, .article li { color: var(--muted); font-size: 15px; }
.article ul { padding-left: 22px; margin-top: 8px; display: grid; gap: 6px; }
.article .update-time { font-size: 13px; color: var(--muted); margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero h1 { font-size: 42px; }
  .hero-visual { order: -1; }
  .hero-phone-img { width: min(240px, 70%); }
  .chip-1 { left: 4%; } .chip-2 { right: 4%; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .nav {
    position: fixed; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: rgba(7,9,15,.97); border-bottom: 1px solid var(--border);
    padding: 18px 24px 24px; gap: 4px; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 11px 6px; font-size: 15.5px; }
  .nav .nav-cta { text-align: center; margin-top: 10px; }
  .nav-toggle { display: grid; place-items: center; }
  .hero-stats { gap: 24px; }
  section { padding: 60px 0; }
}

/* ---------- 备案信息 ---------- */
.footer-beian {
  text-align: center;
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--muted);
}
.footer-beian a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s;
}
.footer-beian a:hover { color: var(--text); }