:root {
  --bg: #f7f7f3;
  --paper: #ffffff;
  --paper-soft: #eef2f1;
  --ink: #122025;
  --muted: #657276;
  --line: rgba(18, 32, 37, .12);
  --accent: #1f3b40;
  --accent-soft: rgba(31, 59, 64, .08);
  --shadow: 0 28px 90px rgba(18, 32, 37, .10);
  --radius-xl: 34px;
  --radius-md: 20px;
  --container: min(1180px, calc(100vw - 40px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, input, 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, 247, 243, .86);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  width: var(--container);
  margin: 0 auto;
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  white-space: nowrap;
}
.logo-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 16px 40px rgba(18, 32, 37, .18);
}
.logo-text { font-size: 18px; }
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.main-nav a {
  padding: 9px 13px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  transition: .24s ease;
}
.main-nav a:hover,
.main-nav a:focus-visible {
  background: var(--accent-soft);
  color: var(--ink);
  outline: none;
}
.search-wrap {
  width: var(--container);
  margin: 0 auto 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}
.search-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  padding: 13px 18px;
  outline: none;
}
.search-wrap input:focus { border-color: rgba(31, 59, 64, .35); box-shadow: 0 0 0 4px var(--accent-soft); }
.search-wrap button,
.btn {
  border: 0;
  border-radius: 999px;
  padding: 13px 20px;
  cursor: pointer;
  transition: transform .24s ease, box-shadow .24s ease, background .24s ease;
}
.search-wrap button { background: var(--ink); color: #fff; }
.search-wrap button:hover,
.btn:hover { transform: translateY(-2px); }
.search-hint { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; }
.hero-section {
  width: var(--container);
  min-height: calc(100vh - 96px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 54px;
  align-items: center;
  padding: 76px 0 68px;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-size: 13px;
}
h1, h2, h3 { line-height: 1.16; letter-spacing: -.035em; }
h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 86px);
  max-width: 820px;
}
h2 { margin: 0; font-size: clamp(30px, 4.2vw, 54px); }
h3 { margin: 0 0 12px; font-size: 22px; }
p { margin-top: 0; }
.hero-lead {
  margin: 26px 0 0;
  font-size: 18px;
  color: var(--muted);
  max-width: 720px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 34px 0; }
.btn-primary { background: var(--ink); color: #fff; box-shadow: 0 18px 48px rgba(18, 32, 37, .18); }
.btn-ghost { background: var(--paper); border: 1px solid var(--line); color: var(--ink); }
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}
.hero-metrics div,
.stat-card,
.minimal-card,
.service-card,
.video-card,
.review-card,
.faq-item,
.social-card,
.case-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.72);
}
.hero-metrics div { padding: 18px; }
.hero-metrics dt { color: var(--muted); font-size: 13px; }
.hero-metrics dd { margin: 6px 0 0; font-size: 28px; font-weight: 800; }
.hero-media {
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--paper);
  box-shadow: var(--shadow);
}
.hero-media img { aspect-ratio: 16 / 10; object-fit: cover; }
figcaption { color: var(--muted); font-size: 13px; padding: 14px 18px 18px; }
.section {
  width: var(--container);
  margin: 0 auto;
  padding: 92px 0;
}
.section-head { max-width: 760px; margin-bottom: 34px; }
.section-head p:not(.eyebrow), .section-copy p { color: var(--muted); font-size: 17px; }
.split-section {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 24px;
  align-items: stretch;
}
.minimal-card {
  padding: 34px;
  min-height: 260px;
  box-shadow: var(--shadow);
}
.domain-display {
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.05;
  color: var(--ink);
  word-break: break-all;
}
.card-grid { display: grid; gap: 18px; }
.service-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.service-card { padding: 26px; }
.service-card span,
.pill {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 6px 11px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}
.service-card p, .case-item p, .review-card p, .faq-item p { color: var(--muted); margin-bottom: 0; }
.muted-section {
  width: 100%;
  max-width: none;
  padding-left: max(20px, calc((100vw - 1180px) / 2));
  padding-right: max(20px, calc((100vw - 1180px) / 2));
  background: #eef2ef;
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.video-card {
  overflow: hidden;
  background: #fff;
  box-shadow: 0 18px 54px rgba(18, 32, 37, .06);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  background: var(--paper-soft);
}
.video-thumb img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform .5s ease, filter .5s ease;
}
.play-button {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 66px;
  height: 66px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.72);
  background: rgba(18,32,37,.84);
  color: #fff;
  opacity: 0;
  transform: scale(.82);
  transition: .28s ease;
}
.video-card:hover .video-thumb img,
.video-card:focus-within .video-thumb img { transform: scale(1.045); filter: saturate(1.06); }
.video-card:hover .play-button,
.video-card.is-active .play-button,
.video-card:focus-within .play-button { opacity: 1; transform: scale(1); }
.video-body { padding: 22px; }
.video-body h3 { font-size: 19px; }
.video-stats {
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
}
.video-stats li { padding: 5px 9px; border: 1px solid var(--line); border-radius: 999px; }
.case-layout { display: grid; grid-template-columns: .95fr 1.05fr; gap: 24px; align-items: stretch; }
.case-image { margin: 0; border-radius: var(--radius-xl); overflow: hidden; background: #fff; box-shadow: var(--shadow); }
.case-image img { height: 100%; object-fit: cover; }
.case-list { display: grid; gap: 16px; }
.case-item { padding: 28px; }
.stats-section { padding-top: 60px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.stat-card { padding: 30px; text-align: center; background: #fff; }
.stat-card strong { display: block; font-size: 42px; line-height: 1; margin-bottom: 12px; }
.stat-card span { color: var(--muted); }
.review-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.review-card { margin: 0; padding: 24px; background: #fff; }
.review-card cite { display: block; margin-top: 18px; font-style: normal; font-weight: 700; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 0 22px; background: #fff; }
.faq-item summary { cursor: pointer; padding: 22px 0; font-weight: 800; }
.faq-item p { padding-bottom: 24px; }
.contact-section { max-width: 920px; }
.contact-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: #fff;
  box-shadow: var(--shadow);
}
.contact-form label { display: grid; gap: 8px; font-weight: 700; }
.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 13px 14px;
  outline: none;
  background: #fbfbf8;
}
.contact-form label:nth-child(4),
.contact-form .btn,
.form-message { grid-column: 1 / -1; }
.form-message { margin: 0; color: var(--accent); }
.social-grid { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 14px; }
.social-card { padding: 22px; text-align: center; background: #fff; font-weight: 800; }
.site-footer { padding: 70px 0 24px; background: #101b1f; color: #f4f7f6; }
.footer-grid,
.footer-bottom { width: var(--container); margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 40px; }
.footer-grid h2 { font-size: 18px; letter-spacing: 0; }
.footer-grid p,
.footer-grid a,
.footer-grid li { color: rgba(244,247,246,.74); }
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.footer-logo .logo-mark { background: #fff; color: #101b1f; }
.footer-bottom { margin-top: 42px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); display: flex; justify-content: space-between; gap: 18px; color: rgba(244,247,246,.66); }
.inner-hero { width: var(--container); margin: 0 auto; padding: 84px 0 42px; }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
.inner-layout { width: var(--container); margin: 0 auto; padding: 42px 0 94px; display: grid; grid-template-columns: 1fr .88fr; gap: 32px; align-items: start; }
.content-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-xl); padding: 34px; box-shadow: var(--shadow); }
.content-panel h2 { font-size: 34px; margin-top: 32px; }
.content-panel h2:first-child { margin-top: 0; }
.content-panel ul { padding-left: 20px; color: var(--muted); }
.side-panel { position: sticky; top: 154px; display: grid; gap: 16px; }
.side-panel figure { margin: 0; background: #fff; border-radius: var(--radius-xl); overflow: hidden; border: 1px solid var(--line); }
.side-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); padding: 24px; }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (max-width: 980px) {
  .header-inner { flex-direction: column; align-items: flex-start; padding: 18px 0 10px; }
  .main-nav { justify-content: flex-start; }
  .hero-section,
  .split-section,
  .case-layout,
  .inner-layout { grid-template-columns: 1fr; }
  .service-grid,
  .video-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .review-grid,
  .stats-grid,
  .social-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .side-panel { position: static; }
}
@media (max-width: 640px) {
  :root { --container: min(100vw - 28px, 1180px); }
  .search-wrap { grid-template-columns: 1fr; }
  .hero-section { padding-top: 46px; min-height: auto; }
  .hero-metrics,
  .service-grid,
  .video-grid,
  .review-grid,
  .stats-grid,
  .social-grid,
  .footer-grid,
  .contact-form { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .muted-section { padding-left: 14px; padding-right: 14px; }
  .footer-bottom { flex-direction: column; }
}