:root {
  --ink: #121821;
  --muted: #596474;
  --paper: #f4f7f9;
  --white: #ffffff;
  --line: rgba(20, 32, 45, .13);
  --cyan: #00d8cf;
  --blue: #3b6fff;
  --violet: #7457e8;
  --night: #09101a;
  --metal: linear-gradient(135deg, #dce7ed 0%, #fff 23%, #a8b7c1 46%, #edf5f8 68%, #7b8b98 100%);
  --shadow: 0 24px 70px rgba(8, 20, 33, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei UI", "PingFang SC", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 92% 4%, rgba(0, 216, 207, .16), transparent 28%),
    radial-gradient(circle at 8% 32%, rgba(116, 87, 232, .11), transparent 24%),
    linear-gradient(180deg, #f9fbfc, #eef3f6 48%, #f8fafb);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid rgba(59, 111, 255, .45); outline-offset: 3px; }
.container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.skip { position: fixed; left: 12px; top: -60px; z-index: 100; padding: 10px 16px; background: #fff; border-radius: 12px; }
.skip:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 250, 251, .84);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px) saturate(140%);
}
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 900; letter-spacing: -.02em; }
.brand-mark {
  width: 38px; height: 38px; display: grid; place-items: center; position: relative; overflow: hidden;
  background: var(--metal); border: 1px solid rgba(255, 255, 255, .9); border-radius: 13px 17px 12px 18px;
  box-shadow: inset -5px -5px 13px rgba(16, 36, 52, .24), inset 7px 7px 14px rgba(255, 255, 255, .94), 0 8px 20px rgba(30, 51, 65, .16);
}
.brand-mark::before { content: ""; width: 13px; height: 20px; border: solid #172432; border-width: 0 5px 5px 0; transform: rotate(45deg) translate(-2px, 2px); }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 700; }
.nav-links a { color: #3f4a57; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: #111a24; }
.nav-toggle { display: none; border: 0; background: transparent; font-size: 24px; cursor: pointer; }
.btn {
  min-width: 132px;
  min-height: 48px;
  padding: 11px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 16px 20px 14px 18px;
  background: #14202d;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
  white-space: nowrap;
  word-break: keep-all;
  writing-mode: horizontal-tb;
  box-shadow: 0 12px 25px rgba(15, 30, 44, .18);
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 17px 34px rgba(15, 30, 44, .22); }
.btn-metal { color: #101923; background: var(--metal); border-color: rgba(255,255,255,.8); box-shadow: inset -4px -4px 10px rgba(25, 48, 64, .2), inset 5px 5px 10px rgba(255,255,255,.9), 0 18px 35px rgba(15,32,44,.2); }
.btn-ghost { color: #182431; background: rgba(255,255,255,.64); border-color: var(--line); box-shadow: none; }

.hero { min-height: 760px; display: grid; align-items: center; overflow: hidden; position: relative; }
.hero::after {
  content: ""; position: absolute; width: 620px; height: 620px; right: -310px; top: 40px; z-index: -1;
  border: 1px solid rgba(45, 67, 82, .11); border-radius: 45% 55% 62% 38% / 50% 39% 61% 50%;
  box-shadow: inset 0 0 90px rgba(255,255,255,.85);
  animation: drift 14s ease-in-out infinite alternate;
}
.hero-grid { display: grid; grid-template-columns: 1.02fr .98fr; gap: 68px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; margin-bottom: 18px; color: #345063; font-size: 12px; font-weight: 900; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 24px; height: 1px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 24px; font-size: clamp(46px, 6.2vw, 86px); line-height: .98; letter-spacing: -.065em; font-weight: 950; }
h1 .shine {
  display: block; color: transparent; background: linear-gradient(110deg, #8797a1, #101b25 32%, #d2dde3 52%, #4b5e6c 74%, #0fc1b9);
  background-clip: text; -webkit-background-clip: text;
}
.hero-copy { max-width: 630px; margin-bottom: 30px; color: var(--muted); font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.platforms { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.tag { padding: 7px 11px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.52); color: #43515f; font-size: 12px; font-weight: 700; }
.hero-media { align-self: center; position: relative; height: auto; padding: 0; margin: 0; overflow: visible; }
.hero-media::before {
  content: ""; position: absolute; inset: 8% -5% 3%; z-index: -1; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,216,207,.3), rgba(59,111,255,.08) 45%, transparent 69%); filter: blur(22px);
}
.hero-media img { filter: drop-shadow(0 32px 34px rgba(17, 34, 48, .22)); }
.float-note {
  position: absolute; right: -12px; bottom: 15%; padding: 13px 16px; border: 1px solid rgba(255,255,255,.84);
  border-radius: 16px; background: rgba(255,255,255,.78); backdrop-filter: blur(14px); box-shadow: var(--shadow); font-size: 12px; font-weight: 800;
}
.pulse { width: 8px; height: 8px; display: inline-block; margin-right: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 6px rgba(0,216,207,.13); }

.stats-wrap { margin-top: -52px; position: relative; z-index: 3; }
.stats {
  display: grid; grid-template-columns: repeat(5, 1fr); overflow: hidden; border: 1px solid rgba(255,255,255,.9);
  border-radius: 26px 36px 24px 34px; background: rgba(255,255,255,.76); backdrop-filter: blur(20px); box-shadow: var(--shadow);
}
.stat { padding: 28px 20px; border-right: 1px solid var(--line); text-align: center; }
.stat:last-child { border: 0; }
.stat strong { display: block; font-size: 28px; line-height: 1.2; letter-spacing: -.04em; }
.stat span { color: var(--muted); font-size: 12px; }

.section { padding: 118px 0; }
.section-dark { color: #edf5f7; background: var(--night); }
.section-head { max-width: 720px; margin-bottom: 54px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head.center .eyebrow { justify-content: center; }
h2 { margin-bottom: 18px; font-size: clamp(34px, 4.2vw, 58px); line-height: 1.05; letter-spacing: -.045em; }
.lead { color: var(--muted); font-size: 17px; }
.section-dark .lead { color: #98a8b4; }

.feature-grid { display: grid; grid-template-columns: 1.15fr .85fr .85fr; grid-template-rows: 1fr 1fr; gap: 14px; }
.feature {
  min-height: 240px; padding: 32px; position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: 26px 34px 24px 31px;
  background: rgba(255,255,255,.7);
}
.feature:first-child { grid-row: span 2; min-height: 494px; background: #14202c; color: #f5fafb; }
.feature:nth-child(4) { grid-column: span 2; }
.feature h3 { margin: 24px 0 9px; font-size: 22px; }
.feature p { color: var(--muted); }
.feature:first-child p { color: #a8b5bf; }
.feature-icon {
  width: 52px; height: 52px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.75);
  border-radius: 16px 20px 14px 22px; background: var(--metal); color: #15202a; font-size: 22px; box-shadow: inset -4px -4px 8px rgba(28,48,61,.2), inset 4px 4px 8px #fff;
}
.orbit { width: 260px; height: 260px; margin: 38px auto 0; position: relative; border: 1px solid rgba(188, 218, 229, .22); border-radius: 50%; }
.orbit::before, .orbit::after { content: ""; position: absolute; inset: 25px; border: 1px solid rgba(0,216,207,.35); border-radius: 50%; }
.orbit::after { inset: 75px; background: radial-gradient(circle at 36% 30%, #fff, #a9bac4 35%, #344955 75%); box-shadow: 0 0 60px rgba(0,216,207,.2); }
.dot { position: absolute; width: 10px; height: 10px; border: 2px solid #0f1c25; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 5px rgba(0,216,207,.12); }
.dot-a { left: 25px; top: 95px; }.dot-b { right: 25px; top: 75px; }.dot-c { left: 130px; bottom: -5px; }

.scene { display: grid; grid-template-columns: .9fr 1.1fr; gap: 78px; align-items: center; }
.scene-media { position: relative; }
.scene-media img { display: block; width: 100%; height: auto; border-radius: 32px 46px 28px 42px; box-shadow: var(--shadow); }
.scene-list { display: grid; gap: 12px; margin-top: 30px; }
.scene-item { display: grid; grid-template-columns: 40px 1fr; gap: 14px; padding: 18px 0; border-top: 1px solid var(--line); }
.scene-item strong { display: block; margin-bottom: 2px; }
.scene-item span { color: var(--muted); font-size: 14px; }
.scene-index { color: #6f7d89; font-size: 12px; font-weight: 900; letter-spacing: .1em; }

.articles { display: grid; grid-template-columns: 1.3fr .85fr .85fr; gap: 14px; }
.article {
  min-height: 335px; padding: 28px; display: flex; flex-direction: column; justify-content: space-between;
  border: 1px solid rgba(255,255,255,.1); border-radius: 26px 36px 22px 31px; background: #111d29;
}
.article:first-child { background: linear-gradient(145deg, rgba(0,216,207,.18), #111d29 55%); }
.article-meta { color: #82a0af; font-size: 12px; letter-spacing: .08em; }
.article h3 { margin: 18px 0 12px; font-size: 24px; line-height: 1.25; }
.article p { color: #9eb0ba; font-size: 14px; }
.read { display: inline-flex; align-items: center; gap: 8px; color: #e8f2f4; font-size: 13px; font-weight: 800; }

.reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.review { padding: 30px; border: 1px solid var(--line); border-radius: 24px 34px 22px 30px; background: rgba(255,255,255,.72); }
.review blockquote { margin: 20px 0 26px; font-size: 16px; }
.review-person { display: flex; align-items: center; gap: 12px; }
.avatar { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--metal); font-weight: 900; box-shadow: inset -3px -3px 7px rgba(24,43,56,.18); }
.review-person span { display: block; color: var(--muted); font-size: 12px; }
.stars { color: #196f6b; letter-spacing: 3px; font-size: 13px; }

.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; align-items: stretch; }
.price-card { padding: 34px; border: 1px solid var(--line); border-radius: 26px 38px 22px 34px; background: rgba(255,255,255,.7); }
.price-card.featured { background: #14202c; color: #fff; transform: translateY(-12px); box-shadow: var(--shadow); }
.plan { color: var(--muted); font-size: 13px; font-weight: 800; }
.featured .plan, .featured .price-note { color: #a7b5be; }
.price { margin: 18px 0 4px; font-size: 48px; line-height: 1; font-weight: 950; letter-spacing: -.05em; }
.price small { font-size: 14px; letter-spacing: 0; }
.price-note { min-height: 44px; color: var(--muted); font-size: 13px; }
.price-card ul { margin: 25px 0; padding: 22px 0 0; border-top: 1px solid var(--line); list-style: none; }
.price-card li { margin: 10px 0; font-size: 14px; }
.price-card li::before { content: "✓"; margin-right: 9px; color: var(--cyan); font-weight: 900; }
.price-card .btn { width: 100%; }
.price-disclaimer { margin-top: 24px; color: var(--muted); text-align: center; font-size: 12px; }

.faq { max-width: 900px; margin: auto; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { padding: 23px 44px 23px 0; position: relative; cursor: pointer; list-style: none; font-weight: 850; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 16px; color: #60717d; font-size: 27px; font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details p { padding: 0 44px 23px 0; margin: 0; color: var(--muted); }

.final-cta { padding: 110px 0; overflow: hidden; }
.cta-panel {
  padding: 68px; position: relative; overflow: hidden; border-radius: 34px 50px 30px 46px;
  background: #101b26; color: #f4f8fa; box-shadow: var(--shadow);
}
.cta-panel::after { content: ""; position: absolute; width: 390px; height: 390px; right: -80px; top: -150px; border-radius: 44% 56% 47% 53%; background: var(--metal); opacity: .8; filter: blur(2px); }
.cta-panel h2, .cta-panel p, .cta-panel .actions { position: relative; z-index: 2; max-width: 700px; }
.cta-panel p { color: #aab7c0; }

.site-footer { padding: 70px 0 24px; background: #09111a; color: #dce5e9; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: 48px; }
.footer-intro p { max-width: 290px; margin-top: 20px; color: #83949f; font-size: 13px; }
.footer-col h3 { margin-bottom: 16px; color: #f4f7f8; font-size: 13px; }
.footer-col a { display: block; margin: 9px 0; color: #83949f; font-size: 13px; }
.footer-bottom { margin-top: 55px; padding-top: 20px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(255,255,255,.08); color: #6e818d; font-size: 12px; }

.page-hero { padding: 130px 0 78px; }
.page-hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 64px; align-items: center; }
.page-hero h1 { font-size: clamp(46px, 5.5vw, 76px); }
.page-hero p { max-width: 650px; color: var(--muted); font-size: 18px; }
.mini-panel { padding: 30px; border: 1px solid rgba(255,255,255,.86); border-radius: 28px 38px 24px 34px; background: rgba(255,255,255,.68); box-shadow: var(--shadow); }
.mini-row { padding: 15px 0; display: flex; justify-content: space-between; gap: 18px; border-bottom: 1px solid var(--line); font-size: 14px; }
.mini-row:last-child { border-bottom: 0; }
.mini-row span { color: var(--muted); }

.download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.download-card { padding: 34px; display: grid; grid-template-columns: 64px 1fr auto; align-items: center; gap: 22px; border: 1px solid var(--line); border-radius: 26px 36px 22px 32px; background: rgba(255,255,255,.74); }
.platform-icon { width: 64px; height: 64px; display: grid; place-items: center; border-radius: 19px 24px 17px 22px; background: var(--metal); color: #182633; font-size: 25px; font-weight: 950; box-shadow: inset -4px -4px 10px rgba(27,47,62,.2), inset 5px 5px 10px #fff; }
.download-card h2 { margin: 0 0 4px; font-size: 21px; letter-spacing: -.02em; }
.download-card p { margin: 0; color: var(--muted); font-size: 13px; }
.download-card .btn { min-width: 124px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: step; }
.step { padding: 30px; border-top: 2px solid #253644; background: rgba(255,255,255,.54); }
.step::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 32px; color: #71818c; font-size: 12px; font-weight: 900; letter-spacing: .15em; }

.help-layout { display: grid; grid-template-columns: 260px 1fr; gap: 62px; align-items: start; }
.help-side { position: sticky; top: 100px; padding: 24px; border: 1px solid var(--line); border-radius: 23px 30px 20px 28px; background: rgba(255,255,255,.68); }
.help-side a { display: block; padding: 10px 12px; border-radius: 10px; color: var(--muted); font-size: 13px; }
.help-side a:hover { color: var(--ink); background: #fff; }
.help-content article { padding: 0 0 58px; margin-bottom: 58px; border-bottom: 1px solid var(--line); scroll-margin-top: 110px; }
.help-content h2 { font-size: 38px; }
.help-content h3 { margin-top: 28px; }
.help-content p, .help-content li { color: var(--muted); }
.notice { padding: 20px 22px; border-left: 3px solid var(--cyan); background: rgba(255,255,255,.68); color: var(--muted); }

@keyframes drift { to { transform: rotate(12deg) scale(.92); border-radius: 60% 40% 42% 58%; } }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }
@media (max-width: 980px) {
  .nav-links { display: none; position: absolute; top: 74px; left: 20px; right: 20px; padding: 22px; flex-direction: column; align-items: stretch; gap: 6px; border: 1px solid var(--line); border-radius: 18px; background: #f9fbfc; box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px; }
  .nav-toggle { display: block; }
  .nav > .btn { display: none; }
  .hero { min-height: auto; padding: 90px 0 110px; }
  .hero-grid, .page-hero-grid, .scene { grid-template-columns: 1fr; }
  .hero-media { max-width: 650px; margin-inline: auto; }
  .stats { grid-template-columns: repeat(3, 1fr); }
  .stat:nth-child(3) { border-right: 0; }
  .stat:nth-child(n+4) { border-top: 1px solid var(--line); }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature:first-child { grid-column: span 2; grid-row: auto; min-height: 450px; }
  .articles { grid-template-columns: 1fr 1fr; }
  .article:first-child { grid-column: span 2; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .download-grid { grid-template-columns: 1fr; }
}
@media (max-width: 700px) {
  .container { width: min(100% - 28px, 1180px); }
  h1 { font-size: 48px; }
  .section { padding: 84px 0; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat { border-top: 1px solid var(--line); }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:first-child, .stat:nth-child(2) { border-top: 0; }
  .stat:last-child { grid-column: span 2; }
  .feature-grid, .reviews, .pricing, .articles, .steps { grid-template-columns: 1fr; }
  .feature:first-child, .feature:nth-child(4), .article:first-child { grid-column: auto; }
  .feature:first-child { min-height: 420px; }
  .price-card.featured { transform: none; }
  .cta-panel { padding: 42px 28px; }
  .cta-panel::after { opacity: .22; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-intro { grid-column: span 2; }
  .footer-bottom { flex-direction: column; }
  .download-card { grid-template-columns: 54px 1fr; }
  .download-card .btn { grid-column: span 2; width: 100%; min-width: 150px; }
  .help-layout { grid-template-columns: 1fr; }
  .help-side { position: static; }
}

/* Hero media sizing guard */
.hero-grid { align-items: center; }
.hero-media { align-self: center; height: auto; padding: 0; margin-top: 0; margin-bottom: 0; overflow: visible; transform: none; clip-path: none; }
.hero-media img { display: block; width: 100%; height: auto; min-height: 0; max-height: none; margin: 0; padding: 0; object-fit: contain; object-position: center; transform: none; clip-path: none; }