:root {
  --ink: #18171c;
  --muted: #66636d;
  --paper: #fbf8f2;
  --white: #fff;
  --coral: #f05a48;
  --coral-dark: #cf3f31;
  --teal: #2a9d8f;
  --gold: #f2b84b;
  --violet: #6657a8;
  --line: #d9d4cb;
  --shadow: 0 18px 50px rgba(24, 23, 28, .12);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }
button { color: inherit; }
.container { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; background: var(--ink); color: #fff; padding: 10px 16px; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 248, 242, .96);
  border-bottom: 2px solid var(--ink);
  backdrop-filter: blur(12px);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border-radius: 8px; }
.brand-name { font-size: 18px; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.site-nav a { padding: 9px 13px; font-size: 14px; font-weight: 700; border-bottom: 3px solid transparent; }
.site-nav a:hover, .site-nav a.active { color: var(--coral-dark); border-color: var(--coral); }
.download-btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--coral);
  color: #fff;
  font-weight: 900;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); background: var(--coral-dark); }
.download-btn:focus-visible, .site-nav a:focus-visible, .menu-toggle:focus-visible, .faq-filter:focus-visible, .faq-question:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
.header-download { min-height: 40px; padding: 7px 16px; font-size: 14px; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 2px solid var(--ink); background: #fff; border-radius: 6px; font-size: 22px; cursor: pointer; }

.hero {
  position: relative;
  min-height: min(760px, calc(100vh - 72px));
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
  background: var(--ink);
  color: #fff;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .22;
  background-image: linear-gradient(#fff 1px, transparent 1px), linear-gradient(90deg, #fff 1px, transparent 1px);
  background-size: 52px 52px;
}
.hero-inner { position: relative; min-height: inherit; display: flex; align-items: center; padding: 70px 0 90px; }
.hero-copy { position: relative; z-index: 3; width: min(620px, 60%); }
.eyebrow { display: inline-block; margin-bottom: 18px; color: var(--gold); font-size: 13px; font-weight: 900; letter-spacing: 0; }
h1, h2, h3 { margin-top: 0; line-height: 1.22; letter-spacing: 0; }
h1 { margin-bottom: 22px; font-size: clamp(40px, 6vw, 76px); }
.hero-lead { max-width: 580px; margin: 0 0 28px; color: #dedbe4; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.hero-note { color: #bdb8c5; font-size: 13px; }
.hero-proof { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.hero-proof span { padding: 6px 10px; border: 1px solid #5c5862; background: #26242b; color: #efedf3; font-size: 12px; }
.hero-media { position: absolute; right: -34px; top: 50%; width: 47%; height: 580px; transform: translateY(-50%); }
.shot { position: absolute; width: min(220px, 44%); max-width: 400px; border: 3px solid #fff; border-radius: 8px; box-shadow: 12px 14px 0 rgba(240, 90, 72, .8); background: #fff; }
.shot-a { left: 0; top: 24px; transform: rotate(-4deg); }
.shot-b { right: 4%; top: 145px; transform: rotate(4deg); box-shadow: 12px 14px 0 rgba(42, 157, 143, .8); }
.shot-c { left: 22%; bottom: 0; transform: rotate(1deg); box-shadow: 12px 14px 0 rgba(242, 184, 75, .8); }

.trust-strip { border-bottom: 2px solid var(--ink); background: var(--gold); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { padding: 20px 18px; border-right: 2px solid var(--ink); }
.trust-item:last-child { border-right: 0; }
.trust-item strong { display: block; font-size: 20px; }
.trust-item span { font-size: 12px; font-weight: 700; }

.section { padding: 92px 0; border-bottom: 1px solid var(--line); }
.section-dark { background: var(--ink); color: #fff; }
.section-white { background: var(--white); }
.section-kicker { display: block; margin-bottom: 10px; color: var(--coral-dark); font-size: 12px; font-weight: 900; }
.section-dark .section-kicker { color: var(--gold); }
.section h2 { max-width: 760px; margin-bottom: 40px; font-size: clamp(30px, 4vw, 48px); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { min-height: 240px; padding: 26px; border: 2px solid var(--ink); border-radius: 8px; background: #fff; }
.feature-card:nth-child(2) { border-top: 9px solid var(--teal); }
.feature-card:nth-child(3) { border-top: 9px solid var(--violet); }
.feature-card:nth-child(4) { border-top: 9px solid var(--gold); }
.feature-card:nth-child(5) { border-top: 9px solid var(--coral); }
.feature-card:nth-child(6) { border-top: 9px solid var(--ink); }
.feature-no { color: var(--coral-dark); font-size: 12px; font-weight: 900; }
.feature-card h3 { margin: 14px 0 12px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; }

.preview-stage { display: grid; grid-template-columns: 1.1fr .9fr; gap: 58px; align-items: center; }
.preview-copy h2 { margin-bottom: 26px; }
.preview-copy ul { margin: 0; padding: 0; list-style: none; }
.preview-copy li { padding: 13px 0; border-bottom: 1px solid #4b4850; color: #d8d5dd; }
.preview-copy strong { color: var(--gold); }
.preview-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 200px)); gap: 14px; justify-content: center; }
.preview-grid figure { margin: 0; }
.preview-grid img { width: 100%; max-width: 400px; border: 2px solid #fff; border-radius: 6px; background: #fff; }
.preview-grid figcaption { padding-top: 7px; color: #bbb7c1; font-size: 12px; }

.path-grid { display: grid; grid-template-columns: repeat(2, 1fr); border: 2px solid var(--ink); }
.path-card { position: relative; min-height: 300px; padding: 34px; border-right: 2px solid var(--ink); background: #fff; }
.path-card:last-child { border-right: 0; background: #eaf5f2; }
.path-card .tag { color: var(--coral-dark); font-size: 12px; font-weight: 900; }
.path-card h3 { margin: 60px 0 14px; font-size: 30px; }
.path-card p { color: var(--muted); }
.text-link { display: inline-block; margin-top: 18px; padding-bottom: 3px; border-bottom: 2px solid var(--ink); font-weight: 900; }
.text-link:hover { color: var(--coral-dark); border-color: var(--coral-dark); }

.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review-score { display: flex; align-items: baseline; gap: 12px; margin: -20px 0 28px; }
.review-score strong { font-size: 28px; }
.review-score span { color: var(--muted); font-size: 13px; }
blockquote { margin: 0; padding: 26px; border: 2px solid var(--ink); border-radius: 8px; background: #fff; }
blockquote p { margin: 0 0 22px; font-size: 15px; }
blockquote footer { color: var(--muted); font-size: 12px; font-weight: 700; }
.stars { color: #b14c00; font-weight: 900; }

.mini-faq { border-top: 2px solid var(--ink); }
.mini-faq details { border-bottom: 2px solid var(--ink); background: #fff; }
.mini-faq summary { padding: 20px 4px; cursor: pointer; font-weight: 900; }
.mini-faq p { margin: 0; padding: 0 4px 22px; color: var(--muted); }
.mini-faq-link { margin-top: 28px; }

.download-band { padding: 66px 0; background: var(--teal); color: #fff; border-bottom: 2px solid var(--ink); }
.download-band-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.download-band h2 { margin: 0 0 10px; font-size: clamp(28px, 4vw, 44px); }
.download-band p, .download-band .band-note { margin: 0; color: #e6f6f2; }
.download-band .download-btn { flex: 0 0 auto; background: var(--gold); color: var(--ink); }

.page-hero { padding: 74px 0 62px; border-bottom: 2px solid var(--ink); background: #fff; }
.page-hero.guide-hero { background: var(--gold); }
.page-hero.faq-hero { background: var(--teal); color: #fff; }
.breadcrumb { margin-bottom: 24px; font-size: 13px; font-weight: 800; }
.breadcrumb a { text-decoration: underline; }
.page-hero h1 { max-width: 900px; margin-bottom: 20px; font-size: clamp(36px, 6vw, 66px); }
.page-hero p { max-width: 760px; margin: 0; font-size: 17px; }

.guide-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 48px; align-items: start; }
.guide-nav { position: sticky; top: 100px; padding: 18px; border: 2px solid var(--ink); background: #fff; }
.guide-nav strong { display: block; margin-bottom: 10px; }
.guide-nav a { display: block; padding: 8px 0; color: var(--muted); font-size: 13px; border-bottom: 1px solid var(--line); }
.guide-nav a:hover { color: var(--coral-dark); }
.guide-content h2 { margin: 0 0 34px; font-size: 38px; }
.guide-step { display: grid; grid-template-columns: 70px minmax(0, 1fr); gap: 22px; padding: 34px 0; border-top: 2px solid var(--ink); }
.step-no { display: flex; width: 56px; height: 56px; align-items: center; justify-content: center; border: 2px solid var(--ink); background: var(--coral); color: #fff; font-size: 22px; font-weight: 900; box-shadow: 4px 4px 0 var(--ink); }
.guide-step h3 { margin-bottom: 12px; font-size: 24px; }
.guide-step p { margin: 0 0 12px; color: #494650; }
.guide-step ul { padding-left: 20px; }
.inline-preview { width: 200px; max-width: 400px; margin: 18px 0; border: 2px solid var(--ink); border-radius: 6px; }
.notice { margin: 34px 0; padding: 22px; border-left: 8px solid var(--gold); background: #fff; }
.notice strong { display: block; margin-bottom: 6px; }
.guide-continue { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 38px; padding: 28px; border: 2px solid var(--ink); background: #eaf5f2; }

.feature-detail { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-bottom: 70px; }
.detail-block { padding: 26px; border: 2px solid var(--ink); background: #fff; }
.detail-block h3 { margin-bottom: 12px; }
.detail-block p { margin: 0; color: var(--muted); }
.faq-tools { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.faq-filter { min-height: 42px; padding: 8px 15px; border: 2px solid var(--ink); border-radius: 6px; background: #fff; cursor: pointer; font-size: 13px; font-weight: 900; }
.faq-filter.active { background: var(--ink); color: #fff; }
.faq-list { border-top: 2px solid var(--ink); }
.faq-item { border-bottom: 2px solid var(--ink); background: #fff; }
.faq-item[hidden] { display: none; }
.faq-question { width: 100%; padding: 20px 50px 20px 18px; border: 0; background: transparent; text-align: left; cursor: pointer; position: relative; font-weight: 900; }
.faq-question::after { content: "+"; position: absolute; right: 18px; top: 14px; font-size: 26px; }
.faq-item.open .faq-question::after { content: "−"; }
.faq-answer { display: none; padding: 0 18px 22px; color: var(--muted); }
.faq-item.open .faq-answer { display: block; }
.faq-answer p { margin: 0; }
.faq-answer a { color: var(--coral-dark); text-decoration: underline; font-weight: 800; }
.no-results { display: none; padding: 26px; border: 2px dashed var(--ink); }
.no-results.show { display: block; }

.site-footer { padding: 48px 0 28px; background: var(--ink); color: #d2cfd7; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer-brand { color: #fff; }
.footer-brand img { width: 46px; height: 46px; }
.footer-copy { margin: 16px 0 0; max-width: 430px; font-size: 13px; color: #aaa6b0; }
.footer-col strong { display: block; margin-bottom: 12px; color: #fff; }
.footer-col a { display: block; padding: 4px 0; color: #c4c0c9; font-size: 13px; }
.footer-col a:hover { color: var(--gold); }
.disclaimer { margin-top: 34px; padding-top: 22px; border-top: 1px solid #444149; font-size: 12px; color: #96919d; }
.copyright { margin: 10px 0 0; font-size: 12px; color: #77727f; }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .container { width: min(calc(100% - 30px), var(--max)); }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 72px; padding: 14px 15px 20px; border-bottom: 2px solid var(--ink); background: var(--paper); }
  .site-nav.open { display: grid; }
  .site-nav a { padding: 12px 10px; }
  .header-download { display: none; }
  .hero { min-height: 760px; }
  .hero-inner { align-items: flex-start; padding-top: 64px; }
  .hero-copy { width: 100%; }
  .hero-media { width: 430px; height: 350px; top: auto; right: 50%; bottom: 32px; transform: translateX(50%); }
  .shot { width: 160px; }
  .shot-a { left: 20px; }
  .shot-b { right: 20px; top: 65px; }
  .shot-c { left: 135px; }
  .feature-grid, .quote-grid { grid-template-columns: repeat(2, 1fr); }
  .preview-stage { grid-template-columns: 1fr; }
  .guide-layout { grid-template-columns: 1fr; }
  .guide-nav { position: static; display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 16px; }
  .guide-nav strong { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 15px; }
  .container { width: min(calc(100% - 24px), var(--max)); }
  .brand-name { font-size: 16px; }
  .hero { min-height: 760px; }
  h1 { font-size: 42px; }
  .hero-lead { font-size: 16px; }
  .hero-media { width: 330px; height: 300px; bottom: 36px; }
  .shot { width: 125px; }
  .shot-a { left: 5px; }
  .shot-b { right: 5px; }
  .shot-c { left: 100px; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .trust-item { border-bottom: 2px solid var(--ink); }
  .trust-item:nth-child(2) { border-right: 0; }
  .trust-item:nth-child(3), .trust-item:nth-child(4) { border-bottom: 0; }
  .feature-grid, .quote-grid, .path-grid, .feature-detail, .footer-grid { grid-template-columns: 1fr; }
  .path-card { border-right: 0; border-bottom: 2px solid var(--ink); }
  .path-card:last-child { border-bottom: 0; }
  .preview-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section { padding: 66px 0; }
  .download-band-inner, .guide-continue { align-items: flex-start; flex-direction: column; }
  .download-band .download-btn { width: 100%; }
  .guide-step { grid-template-columns: 52px minmax(0, 1fr); gap: 14px; }
  .step-no { width: 44px; height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}