:root { --blue:#315fb4; --blue-dark:#244782; --olive:#68754a; --ink:#172033; --muted:#5d6678; --bg:#f1f3f6; --white:#fff; --line:#d4d9e2; --soft:#e8edf7; --shadow:0 18px 40px rgba(31,48,82,.14); }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; color:var(--ink); background:var(--bg); font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",Arial,Helvetica,sans-serif; line-height:1.7; }
img { display:block; max-width:100%; height:auto; }
a { color:inherit; text-decoration:none; }
button { font:inherit; }
.wrap { width:min(1160px,calc(100% - 48px)); margin-inline:auto; }
.header { position:sticky; top:0; z-index:30; background:rgba(255,255,255,.96); border-bottom:1px solid var(--line); backdrop-filter:blur(12px); }
.header-row { min-height:72px; display:flex; align-items:center; gap:28px; }
.brand { display:flex; align-items:center; gap:11px; margin-right:auto; font-size:20px; font-weight:800; }
.brand img { width:38px; height:38px; border-radius:5px; }
.nav { display:flex; gap:26px; }
.nav a { padding:23px 0 18px; color:#515b70; border-bottom:3px solid transparent; font-size:14px; }
.nav a:hover,.nav a.active { color:var(--ink); border-color:var(--blue); }
.top-download,.button { min-height:45px; display:inline-flex; align-items:center; justify-content:center; padding:0 23px; border-radius:4px; font-weight:750; }
.top-download,.button.primary { color:var(--white); background:var(--blue); }
.top-download:hover,.button.primary:hover { background:var(--blue-dark); }
.button.outline { border:1px solid #8791a6; background:transparent; }
.button.light { color:var(--blue-dark); background:var(--white); }
.menu-toggle { display:none; width:44px; height:44px; border:1px solid var(--line); border-radius:4px; background:var(--white); font-size:22px; }
.hero { background:var(--white); border-bottom:1px solid var(--line); }
.hero-inner { min-height:638px; display:grid; grid-template-columns:minmax(0,1fr) minmax(420px,.9fr); gap:72px; align-items:center; padding-block:44px; }
.kicker,.section-head>span,.download-row span,.inner-hero span { color:var(--blue); font-size:12px; font-weight:800; }
.hero h1 { margin:13px 0 18px; max-width:670px; font-size:clamp(42px,5vw,66px); line-height:1.08; letter-spacing:0; }
.hero-copy>p { max-width:650px; margin:0; color:var(--muted); font-size:17px; }
.hero-actions { display:flex; flex-wrap:wrap; gap:12px; margin-top:26px; }
.hero-summary { display:grid; grid-template-columns:repeat(3,1fr); margin-top:30px; border-top:1px solid var(--line); }
.hero-summary span { padding:16px 10px 0 0; color:#4f586c; font-size:13px; }
.hero-summary b { display:block; color:var(--olive); }
.hero-media { min-height:530px; position:relative; display:flex; align-items:center; justify-content:center; border-left:1px solid var(--line); }
.phone-frame { position:relative; z-index:2; width:300px; padding:12px; background:var(--white); border:1px solid #bfc7d7; box-shadow:var(--shadow); }
.phone-frame img { max-width:276px; max-height:490px; margin:auto; }
.media-index { position:absolute; top:18px; left:20px; display:grid; gap:2px; }
.media-index b { color:var(--blue); font-size:28px; }
.media-index span { font-size:12px; }
.media-caption { position:absolute; z-index:3; right:0; bottom:38px; width:220px; padding:16px; color:var(--white); background:var(--olive); font-size:13px; }
.band { padding-block:82px; }
.section-head { display:grid; grid-template-columns:120px minmax(220px,.65fr) minmax(260px,1fr); gap:22px; align-items:end; margin-bottom:32px; padding-bottom:16px; border-bottom:1px solid var(--line); }
.section-head h2 { margin:0; font-size:34px; line-height:1.2; }
.section-note { color:var(--muted); font-size:15px; }
.timeline { background:var(--bg); }
.timeline-grid { display:grid; grid-template-columns:repeat(4,1fr); border-top:1px solid var(--blue); }
.timeline-grid article { min-height:220px; padding:24px; border-right:1px solid var(--line); border-bottom:1px solid var(--line); }
.timeline-grid article:first-child { border-left:1px solid var(--line); }
.timeline-grid b { color:var(--olive); font-size:12px; }
.timeline-grid h3 { margin:42px 0 9px; font-size:19px; }
.timeline-grid p { margin:0; color:var(--muted); font-size:14px; }
.gallery { background:var(--white); }
.gallery-layout { display:grid; grid-template-columns:260px 260px 1fr; gap:26px; align-items:center; }
.gallery figure { margin:0; background:var(--soft); border:1px solid var(--line); }
.gallery figure img { max-width:225px; max-height:430px; margin:18px auto 0; }
.gallery figcaption { display:grid; gap:3px; padding:16px; background:var(--white); border-top:1px solid var(--line); }
.gallery figcaption span { color:var(--muted); font-size:13px; }
.gallery-brief { padding:34px; border-left:4px solid var(--blue); background:var(--bg); }
.gallery-brief>span { color:var(--olive); font-size:12px; font-weight:800; }
.gallery-brief h3 { margin:9px 0 12px; font-size:26px; }
.gallery-brief p { color:var(--muted); }
.gallery-brief a { color:var(--blue); font-weight:750; }
.features { color:var(--white); background:#202b43; }
.features .section-head { border-color:#48546d; }
.features .section-head>span { color:#a9c0ef; }
.feature-list { display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:#4a556c; }
.feature-list article { min-height:190px; padding:28px; background:#202b43; }
.feature-list span { color:#aabf7f; font-size:12px; font-weight:800; }
.feature-list h3 { margin:24px 0 8px; }
.feature-list p { margin:0; color:#cdd3df; }
.faq-preview { background:var(--bg); }
.faq-links { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.faq-links a { min-height:145px; display:grid; align-content:space-between; padding:24px; background:var(--white); border:1px solid var(--line); }
.faq-links a:hover { border-color:var(--blue); }
.faq-links span { color:var(--muted); font-size:14px; }
.download { padding-block:45px; color:var(--white); background:var(--blue); }
.download-row { display:flex; align-items:center; justify-content:space-between; gap:26px; }
.download-row span { color:#dfe8fb; }
.download-row h2 { margin:5px 0 0; font-size:30px; }
footer { padding-block:28px; color:#697386; background:#e4e7ec; text-align:center; font-size:13px; }
footer p { margin:5px 0; }
.inner-hero { padding-block:72px; background:var(--soft); border-bottom:1px solid var(--line); }
.inner-grid { display:grid; grid-template-columns:1fr 280px; gap:70px; align-items:end; }
.inner-hero h1 { margin:10px 0 16px; max-width:800px; font-size:46px; line-height:1.18; }
.inner-hero p { margin:0; max-width:720px; color:var(--muted); font-size:17px; }
.inner-hero ol { margin:0; padding:18px 18px 18px 42px; background:var(--white); border-top:3px solid var(--blue); }
.inner-hero li { padding:5px 0; }
.guide-body,.faq-body { padding-block:70px 94px; background:var(--white); }
.guide-grid,.faq-grid { display:grid; grid-template-columns:210px minmax(0,760px); justify-content:space-between; gap:70px; }
.guide-grid aside,.faq-grid aside { position:sticky; top:102px; align-self:start; display:grid; gap:8px; padding-top:14px; border-top:3px solid var(--blue); }
.guide-grid aside a,.faq-grid aside a { padding:7px 0; color:var(--muted); border-bottom:1px solid var(--line); font-size:14px; }
.guide-grid article>section { padding-bottom:44px; margin-bottom:44px; border-bottom:1px solid var(--line); }
.guide-grid article>section>span { color:var(--olive); font-size:12px; font-weight:800; }
.guide-grid h2 { margin:7px 0 17px; font-size:30px; }
.guide-grid p,.faq-grid aside p { color:#4f596d; }
.guide-grid article a:not(.button) { color:var(--blue); font-weight:750; }
.guide-cta { padding:30px; background:var(--soft); border-left:4px solid var(--olive); }
.guide-cta h2 { margin-top:0; }
.faq-list { border-top:1px solid var(--ink); }
.faq-item { border-bottom:1px solid var(--line); }
.faq-item>button { width:100%; display:grid; grid-template-columns:42px 1fr 24px; gap:12px; align-items:center; padding:21px 0; color:var(--ink); background:transparent; border:0; text-align:left; cursor:pointer; }
.faq-item>button span { color:var(--blue); font-size:12px; }
.faq-item>button i { font-size:22px; font-style:normal; }
.faq-item>div { display:none; padding:0 32px 20px 54px; color:var(--muted); }
.faq-item>div p { margin:0; }
.faq-item.open>div { display:block; }
.faq-item.open>button i { transform:rotate(45deg); }
@media (max-width:900px) {
  .wrap { width:min(100% - 32px,720px); }
  .header-row { min-height:64px; }
  .brand img { width:34px; height:34px; }
  .menu-toggle { display:grid; place-items:center; }
  .nav { display:none; position:absolute; top:64px; left:16px; right:16px; padding:12px 18px; background:var(--white); border:1px solid var(--line); box-shadow:var(--shadow); }
  .nav.open { display:grid; }
  .nav a { padding:10px 0; border-bottom-width:1px; }
  .top-download { display:none; }
  .hero-inner { min-height:auto; grid-template-columns:1fr; gap:22px; padding-block:28px 22px; }
  .hero h1 { margin-block:9px 12px; font-size:37px; }
  .hero-copy>p { font-size:15px; line-height:1.58; }
  .hero-actions { margin-top:18px; }
  .hero-summary { margin-top:16px; }
  .hero-media { min-height:300px; border:0; }
  .phone-frame { width:175px; padding:8px; }
  .phone-frame img { max-width:100%; max-height:276px; }
  .media-caption { right:4px; bottom:18px; width:155px; padding:11px; font-size:11px; }
  .media-index { top:4px; left:2px; }
  .band { padding-block:58px; }
  .section-head { grid-template-columns:1fr; gap:7px; }
  .timeline-grid { grid-template-columns:repeat(2,1fr); }
  .gallery-layout { grid-template-columns:repeat(2,1fr); }
  .gallery-brief { grid-column:1/-1; }
  .feature-list { grid-template-columns:1fr; }
  .faq-links { grid-template-columns:1fr; }
  .inner-grid,.guide-grid,.faq-grid { grid-template-columns:1fr; }
  .guide-grid,.faq-grid { gap:44px; }
  .guide-grid aside,.faq-grid aside { position:static; }
  .inner-hero { padding-block:50px; }
  .inner-hero h1 { font-size:35px; }
  .inner-hero ol { display:grid; grid-template-columns:repeat(2,1fr); }
}
@media (max-width:520px) {
  .wrap { width:calc(100% - 28px); }
  .hero h1 { font-size:30px; }
  .hero-actions .button { flex:1 1 145px; padding-inline:12px; }
  .hero-summary span { font-size:11px; }
  .timeline-grid { grid-template-columns:1fr; }
  .timeline-grid article { min-height:170px; border-left:1px solid var(--line); }
  .timeline-grid h3 { margin-top:22px; }
  .gallery-layout { gap:12px; }
  .gallery figure img { max-width:140px; max-height:250px; }
  .gallery figcaption { padding:10px; }
  .download-row { align-items:flex-start; flex-direction:column; }
  .download-row h2 { font-size:25px; }
  .inner-hero h1 { font-size:31px; }
  .faq-item>div { padding-left:0; }
}