:root {
  --ink: #101828;
  --muted: #667085;
  --line: #e7eaf0;
  --soft: #f7f8fa;
  --yellow: #ffca0a;
  --yellow-deep: #f4b900;
  --navy: #06152d;
  --white: #fff;
  --green: #12b76a;
  --shadow: 0 20px 60px rgba(16, 24, 40, .09);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.announcement {
  position: relative;
  z-index: 50;
  padding: 9px 20px;
  color: #fff;
  background: #07172f;
  text-align: center;
  font-size: 13px;
}
.announcement b { color: var(--yellow); }
.announcement a { margin-left: 12px; color: var(--yellow); }
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 72px;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid rgba(231,234,240,.9);
  backdrop-filter: blur(18px);
}
.nav-inner { height: 100%; display: flex; align-items: center; gap: 38px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; }
.logo-mark {
  position: relative;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: inset 0 0 0 9px #ffdc43;
}
.logo-mark::after {
  content: "";
  position: absolute;
  inset: 11px;
  border-radius: 50%;
  background: #654b00;
}
.nav-links { display: flex; align-items: center; gap: 30px; margin-left: auto; color: #475467; font-size: 14px; }
.nav-links a:hover, .nav-links a.active { color: #111; }
.nav-actions { display: flex; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 23px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 700;
  transition: .2s ease;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #1a1600; background: var(--yellow); box-shadow: 0 12px 28px rgba(255,202,10,.3); }
.btn-primary:hover { background: #ffd42f; }
.btn-secondary { color: #fff; border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.08); }
.btn-light { color: var(--ink); border-color: var(--line); background: #fff; }
.btn-dark { color: #fff; background: #101828; }
.btn-sm { min-height: 40px; padding: 0 17px; border-radius: 10px; font-size: 14px; }
.hero {
  position: relative;
  overflow: hidden;
  min-height: 720px;
  color: #fff;
  background:
    radial-gradient(circle at 18% 15%, rgba(29,83,150,.45), transparent 28%),
    radial-gradient(circle at 85% 60%, rgba(255,202,10,.14), transparent 22%),
    var(--navy);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .16;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, #000, transparent 80%);
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1fr 1.05fr; align-items: center; min-height: 625px; gap: 54px; padding: 66px 0 42px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 6px 11px; border-radius: 99px; color: #ffd83b; background: rgba(255,202,10,.1); border: 1px solid rgba(255,202,10,.22); font-size: 13px; font-weight: 700; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 5px rgba(255,202,10,.12); }
.hero h1 { max-width: 560px; margin: 20px 0 18px; font-size: clamp(42px, 5vw, 68px); line-height: 1.12; letter-spacing: -2px; }
.hero h1 span { color: var(--yellow); }
.hero-copy { max-width: 600px; margin: 0 0 28px; color: #b9c4d5; font-size: 17px; }
.hero-actions { display: flex; gap: 13px; flex-wrap: wrap; }
.hero-note { margin-top: 15px; color: #8291a7; font-size: 12px; }
.hero-visual { position: relative; }
.hero-visual img { width: 100%; border: 1px solid rgba(255,255,255,.15); border-radius: 28px; box-shadow: 0 36px 90px rgba(0,0,0,.4); }
.ai-badge {
  position: absolute;
  right: -18px;
  top: -20px;
  padding: 15px 18px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 16px;
  background: rgba(9,27,55,.88);
  box-shadow: 0 18px 40px rgba(0,0,0,.28);
  backdrop-filter: blur(12px);
}
.ai-badge b { display: block; color: var(--yellow); font-size: 15px; }
.ai-badge span { color: #9fadc2; font-size: 12px; }
.stats { position: relative; display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid rgba(255,255,255,.1); }
.stat { padding: 25px 22px; border-right: 1px solid rgba(255,255,255,.1); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; color: #fff; font-size: 24px; }
.stat span { color: #8797ad; font-size: 13px; }
section { padding: 100px 0; }
.section-head { max-width: 700px; margin: 0 auto 48px; text-align: center; }
.kicker { color: #b18400; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.section-head h2, .split-title h2 { margin: 10px 0 14px; font-size: clamp(32px, 4vw, 46px); line-height: 1.2; letter-spacing: -1px; }
.section-head p, .split-title p { margin: 0; color: var(--muted); }
.features { background: #fff; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { padding: 28px; border: 1px solid var(--line); border-radius: 20px; background: #fff; transition: .25s ease; }
.feature-card:hover { transform: translateY(-5px); border-color: #f2d35e; box-shadow: var(--shadow); }
.icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 19px;
  border-radius: 14px;
  color: #6e5400;
  background: #fff7ce;
  font-size: 22px;
}
.feature-card h3 { margin: 0 0 9px; font-size: 19px; }
.feature-card p { min-height: 78px; margin: 0 0 15px; color: var(--muted); font-size: 14px; }
.more { color: #8b6900; font-size: 14px; font-weight: 700; }
.scenarios { background: var(--soft); }
.scenario-list { display: grid; gap: 28px; }
.scenario {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  overflow: hidden;
  min-height: 390px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: #fff;
  box-shadow: 0 14px 50px rgba(16,24,40,.05);
}
.scenario:nth-child(even) .scenario-media { order: 2; }
.scenario-media { height: 100%; min-height: 390px; }
.scenario-media img { width: 100%; height: 100%; object-fit: cover; }
.scenario-copy { padding: 54px; }
.scenario-copy h3 { margin: 11px 0 14px; font-size: 31px; }
.scenario-copy p { color: var(--muted); }
.checks { padding: 0; list-style: none; }
.checks li { margin: 8px 0; font-size: 14px; }
.checks li::before { content: "✓"; margin-right: 9px; color: var(--green); font-weight: 900; }
.compare-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.compare-table { width: 100%; min-width: 850px; border-collapse: collapse; background: #fff; }
.compare-table th, .compare-table td { padding: 17px 18px; border-bottom: 1px solid var(--line); text-align: center; font-size: 14px; }
.compare-table th:first-child, .compare-table td:first-child { text-align: left; font-weight: 700; }
.compare-table thead th { padding: 22px 18px; background: #f9fafb; }
.compare-table th.sun { color: #443500; background: #fff8d6; }
.compare-table td.sun { background: #fffcf0; font-weight: 700; }
.yes { color: var(--green); font-weight: 900; }
.no { color: #98a2b3; }
.price { color: #b27b00; }
.reviews { color: #fff; background: var(--navy); }
.reviews .section-head p { color: #99a8bd; }
.review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.review-card { padding: 28px; border: 1px solid rgba(255,255,255,.1); border-radius: 20px; background: rgba(255,255,255,.055); }
.stars { color: var(--yellow); letter-spacing: 3px; }
.review-card blockquote { min-height: 130px; margin: 18px 0 24px; color: #c3cede; font-size: 15px; }
.person { display: flex; align-items: center; gap: 12px; }
.avatar { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; color: #181300; background: var(--yellow); font-weight: 900; }
.person small { display: block; color: #8292aa; }
.faq-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 70px; align-items: start; }
.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 22px 42px 22px 0; list-style: none; cursor: pointer; font-weight: 700; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 5px; top: 17px; color: #8a6500; font-size: 24px; font-weight: 400; }
details[open] summary::after { content: "−"; }
details p { margin: -5px 0 22px; color: var(--muted); font-size: 14px; }
.articles { background: var(--soft); }
.article-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.article-card { overflow: hidden; border: 1px solid var(--line); border-radius: 19px; background: #fff; }
.article-card img { width: 100%; height: 190px; object-fit: cover; }
.article-body { padding: 23px; }
.article-meta { color: #947000; font-size: 12px; font-weight: 700; }
.article-body h3 { margin: 9px 0; font-size: 18px; line-height: 1.45; }
.article-body p { color: var(--muted); font-size: 13px; }
.final-cta { padding: 80px 0; }
.cta-box {
  display: grid;
  grid-template-columns: 1.2fr auto;
  align-items: center;
  gap: 30px;
  padding: 56px 64px;
  overflow: hidden;
  color: #fff;
  border-radius: 30px;
  background: radial-gradient(circle at 90% 10%, rgba(255,202,10,.24), transparent 24%), var(--navy);
}
.cta-box h2 { margin: 0 0 10px; font-size: 36px; }
.cta-box p { margin: 0; color: #a8b5c7; }
footer { padding: 56px 0 28px; color: #98a2b3; background: #050f20; font-size: 13px; }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(3,1fr); gap: 50px; }
.footer-brand p { max-width: 320px; }
.footer-col h4 { color: #fff; }
.footer-col a { display: block; margin: 9px 0; }
.footer-bottom { display: flex; justify-content: space-between; margin-top: 45px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.08); }

.sub-hero { padding: 76px 0 62px; text-align: center; background: linear-gradient(180deg,#f4f7fb,#fff); }
.sub-hero h1 { margin: 12px 0; font-size: 48px; line-height: 1.2; }
.sub-hero p { max-width: 700px; margin: 0 auto; color: var(--muted); }
.download-section { padding-top: 65px; }
.download-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.download-card { padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.download-card.featured { border: 2px solid var(--yellow); box-shadow: var(--shadow); }
.os-icon { display: grid; place-items: center; width: 54px; height: 54px; border-radius: 15px; background: #101828; color: #fff; font-size: 23px; font-weight: 900; }
.download-card h3 { margin-bottom: 4px; }
.download-card p { min-height: 52px; margin-top: 0; color: var(--muted); font-size: 13px; }
.version { margin: 17px 0; padding: 11px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: #667085; font-size: 12px; }
.wide { width: 100%; }
.download-note { padding: 28px; border-radius: 18px; background: #fff9de; color: #705800; }
.help-shell { display: grid; grid-template-columns: 260px 1fr; gap: 48px; padding: 65px 0 100px; }
.help-sidebar { align-self: start; position: sticky; top: 100px; padding: 22px; border: 1px solid var(--line); border-radius: 16px; }
.help-sidebar a { display: block; padding: 10px 13px; border-radius: 8px; color: var(--muted); font-size: 14px; }
.help-sidebar a:hover { color: #111; background: #fff8d6; }
.help-content h2 { margin-top: 0; font-size: 32px; }
.help-search { display: flex; gap: 8px; margin-bottom: 35px; }
.help-search input { flex: 1; height: 50px; padding: 0 16px; border: 1px solid var(--line); border-radius: 10px; outline: none; }
.help-search input:focus { border-color: var(--yellow-deep); box-shadow: 0 0 0 3px rgba(255,202,10,.18); }
.help-cards { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; }
.help-card { padding: 22px; border: 1px solid var(--line); border-radius: 14px; }
.help-card h3 { margin: 0 0 7px; font-size: 16px; }
.help-card p { margin: 0; color: var(--muted); font-size: 13px; }
.guide { margin-top: 48px; }
.guide-steps { counter-reset: step; }
.guide-step { position: relative; margin: 18px 0; padding: 20px 20px 20px 66px; border-radius: 14px; background: var(--soft); }
.guide-step::before { counter-increment: step; content: counter(step); position: absolute; left: 18px; top: 20px; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--yellow); font-weight: 900; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero-grid, .scenario, .faq-layout, .cta-box, .help-shell { grid-template-columns: 1fr; }
  .hero-grid { padding-top: 55px; }
  .hero-visual { margin-top: 15px; }
  .feature-grid, .review-grid, .article-grid, .download-grid { grid-template-columns: repeat(2,1fr); }
  .scenario:nth-child(even) .scenario-media { order: initial; }
  .scenario-copy { padding: 36px; }
  .help-sidebar { display: none; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1180px); }
  .nav-actions .btn-light { display: none; }
  .navbar { height: 64px; }
  .hero h1 { font-size: 42px; }
  .hero-grid { gap: 25px; }
  .stats { grid-template-columns: repeat(2,1fr); }
  .stat:nth-child(2) { border-right: 0; }
  section { padding: 72px 0; }
  .feature-grid, .review-grid, .article-grid, .download-grid, .help-cards, .footer-grid { grid-template-columns: 1fr; }
  .feature-card p { min-height: auto; }
  .scenario-media { min-height: 230px; }
  .scenario-copy { padding: 30px 24px; }
  .cta-box { padding: 38px 25px; }
  .cta-box h2 { font-size: 30px; }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .sub-hero h1 { font-size: 38px; }
}