:root {
  --bg: #f7f4ef;
  --surface: rgba(255,255,255,.78);
  --ink: #101317;
  --muted: #68707a;
  --line: rgba(16,19,23,.12);
  --soft: #ebe5da;
  --accent: #111827;
  --radius: 28px;
  --shadow: 0 24px 70px rgba(17,24,39,.10);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: radial-gradient(circle at top left, #fff 0, var(--bg) 42%, #eee8dd 100%); color: var(--ink); line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.site-header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(20px); background: rgba(247,244,239,.82); border-bottom: 1px solid var(--line); }
.header-inner { max-width: 1180px; margin: 0 auto; padding: 18px 22px 10px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand-logo, .footer-logo { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .06em; }
.brand-logo img, .footer-logo img { border-radius: 14px; box-shadow: 0 12px 30px rgba(0,0,0,.08); }
.primary-nav { display: flex; align-items: center; gap: 22px; font-size: 14px; color: #303641; }
.primary-nav a { position: relative; padding: 6px 0; }
.primary-nav a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: var(--ink); transition: width .25s ease; }
.primary-nav a:hover::after { width: 100%; }
.nav-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 8px 14px; }
.header-search { max-width: 1180px; margin: 0 auto; padding: 0 22px 16px; display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.header-search input { border: 1px solid var(--line); border-radius: 999px; padding: 12px 18px; background: rgba(255,255,255,.88); outline: none; }
.header-search button, .share-row button { border: 0; border-radius: 999px; padding: 12px 18px; background: var(--ink); color: white; cursor: pointer; }
.search-tip { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; }
.section-pad { max-width: 1180px; margin: 0 auto; padding: 86px 22px; }
.hero { min-height: calc(100vh - 104px); display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); gap: 56px; align-items: center; }
.eyebrow { margin: 0 0 12px; color: #6b5d45; font-size: 13px; letter-spacing: .16em; text-transform: uppercase; font-weight: 700; }
h1, h2, h3 { line-height: 1.16; letter-spacing: -.04em; margin: 0; }
h1 { font-size: clamp(42px, 6vw, 82px); }
h2 { font-size: clamp(30px, 4vw, 52px); }
h3 { font-size: 23px; }
p { margin: 12px 0 0; }
.hero-lead, .sub-hero p { font-size: 18px; color: #3d444f; max-width: 740px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px; border-radius: 999px; border: 1px solid var(--line); transition: transform .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.button.primary { background: var(--ink); color: white; }
.button.ghost { background: rgba(255,255,255,.72); }
.hero-stats { margin: 42px 0 0; display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; }
.hero-stats div, .proof-grid div { padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.62); }
.hero-stats dt { color: var(--muted); font-size: 13px; }
.hero-stats dd { margin: 4px 0 0; font-size: 26px; font-weight: 800; }
.hero-media { margin: 0; position: relative; }
.hero-media img { border-radius: 38px; box-shadow: var(--shadow); aspect-ratio: 1 / .96; object-fit: cover; }
.hero-media figcaption { color: var(--muted); font-size: 13px; margin-top: 12px; text-align: center; }
.intro-split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 58px; border-top: 1px solid var(--line); }
.muted { color: var(--muted); }
.section-heading { max-width: 760px; margin-bottom: 34px; }
.section-heading.centered { text-align: center; margin-left: auto; margin-right: auto; }
.feature-grid, .video-grid, .review-grid, .gallery-grid, .proof-grid { display: grid; gap: 18px; }
.feature-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.feature-grid article, .review-grid article, .content-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: 0 16px 48px rgba(17,24,39,.05); }
.feature-grid span { color: var(--muted); font-weight: 800; }
.video-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
.video-card { overflow: hidden; border: 1px solid var(--line); border-radius: 32px; background: rgba(255,255,255,.82); box-shadow: 0 18px 55px rgba(17,24,39,.08); }
.video-frame { position: relative; aspect-ratio: 16 / 10; background: #ddd5ca; overflow: hidden; }
.video-frame img, .video-frame video { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease, opacity .3s ease; }
.video-frame video { position: absolute; inset: 0; opacity: 0; z-index: 1; }
.video-frame.is-playing video { opacity: 1; }
.video-frame.is-playing img { opacity: 0; }
.video-card:hover .video-frame img { transform: scale(1.04); }
.play-button { position: absolute; z-index: 2; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(.96); width: 68px; height: 68px; border: 0; border-radius: 50%; background: rgba(255,255,255,.86); color: var(--ink); cursor: pointer; box-shadow: 0 20px 50px rgba(0,0,0,.18); opacity: 0; transition: opacity .2s ease, transform .2s ease; }
.video-card:hover .play-button, .play-button:focus-visible { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-body { padding: 26px; }
.metrics, .tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.metrics span, .tag-list span, .domain-pill { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 6px 10px; background: rgba(247,244,239,.9); color: #3f4751; font-size: 13px; }
.proof-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.proof-grid strong { display: block; font-size: 42px; letter-spacing: -.05em; }
.proof-grid span { color: var(--muted); }
.gallery-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.gallery figure { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 26px; overflow: hidden; }
.gallery img { aspect-ratio: 4 / 3; object-fit: cover; }
.gallery figcaption { padding: 14px 18px; color: var(--muted); font-size: 14px; }
.review-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.review-grid article span { display: block; color: var(--muted); font-size: 14px; }
.stars { color: #8c6a2f; letter-spacing: .12em; }
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 12px; }
details { background: rgba(255,255,255,.76); border: 1px solid var(--line); border-radius: 20px; padding: 20px 24px; }
summary { cursor: pointer; font-weight: 800; }
.contact-band { display: grid; grid-template-columns: .95fr 1.05fr; gap: 34px; align-items: start; }
.share-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.contact-form { display: grid; gap: 14px; background: rgba(255,255,255,.82); border: 1px solid var(--line); border-radius: 30px; padding: 28px; box-shadow: var(--shadow); }
.contact-form label { display: grid; gap: 8px; color: #34404c; }
.contact-form input, .contact-form select, .contact-form textarea { border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; background: white; outline: none; }
.form-tip { color: #2d6a4f; }
.sub-hero { padding-bottom: 48px; }
.article-layout { padding-top: 16px; display: grid; grid-template-columns: 240px minmax(0,1fr); gap: 34px; }
.breadcrumb { position: sticky; top: 136px; align-self: start; display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; }
.article-body { display: grid; gap: 18px; }
.site-footer { border-top: 1px solid var(--line); background: rgba(17,24,39,.96); color: white; padding: 54px 22px 28px; }
.footer-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 36px; }
.footer-grid p, .footer-grid a { color: rgba(255,255,255,.72); }
.footer-grid a { display: block; margin-top: 8px; }
.footer-grid h2 { font-size: 18px; letter-spacing: 0; }
.footer-bottom { max-width: 1180px; margin: 32px auto 0; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.12); display: flex; justify-content: space-between; gap: 20px; color: rgba(255,255,255,.68); }
.footer-bottom p { margin: 0; }
@media (max-width: 920px) {
  .primary-nav { display: none; position: absolute; left: 22px; right: 22px; top: 70px; padding: 18px; background: white; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
  .primary-nav.is-open { display: grid; }
  .nav-toggle { display: inline-flex; }
  .hero, .intro-split, .contact-band, .article-layout { grid-template-columns: 1fr; }
  .feature-grid, .proof-grid, .review-grid, .gallery-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .video-grid { grid-template-columns: 1fr; }
  .breadcrumb { position: static; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .section-pad { padding: 58px 18px; }
  .hero { min-height: auto; }
  .hero-stats, .feature-grid, .proof-grid, .review-grid, .gallery-grid { grid-template-columns: 1fr; }
  .header-search { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}