:root {
  --paper: #fffaf2;
  --white: #ffffff;
  --ink: #20252c;
  --muted: #667078;
  --line: #d9d4ca;
  --coral: #ff5c57;
  --coral-dark: #d83d39;
  --mint: #25b79f;
  --yellow: #ffd55a;
  --sky: #dff3ff;
  --shadow: 6px 6px 0 var(--ink);
  --content: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 1000;
  padding: 10px 16px;
  color: var(--white);
  background: var(--ink);
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--ink);
  background: rgba(255, 250, 242, .96);
  backdrop-filter: blur(12px);
}

.nav-wrap {
  width: min(calc(100% - 32px), var(--content));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--ink);
  font-size: 21px;
  font-weight: 900;
  text-decoration: none;
}

.brand img { width: 42px; height: 42px; border: 2px solid var(--ink); border-radius: 8px; }

.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a {
  padding: 8px 13px;
  border-bottom: 3px solid transparent;
  font-weight: 700;
  text-decoration: none;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { border-color: var(--coral); }

.nav-download, .btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  color: var(--white);
  background: var(--coral);
  box-shadow: 3px 3px 0 var(--ink);
  font-weight: 900;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.nav-download:hover, .btn:hover { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); background: var(--coral-dark); }
.btn:focus-visible, .site-nav a:focus-visible, .menu-toggle:focus-visible { outline: 3px solid var(--mint); outline-offset: 3px; }
.btn-dark { background: var(--ink); }
.btn-dark:hover { background: #343b45; }
.btn-light { color: var(--ink); background: var(--white); }
.btn-light:hover { background: var(--yellow); }

.menu-toggle {
  display: none;
  width: 46px;
  height: 42px;
  padding: 0;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  font-size: 23px;
  font-weight: 900;
}

.container { width: min(calc(100% - 32px), var(--content)); margin: 0 auto; }
.section { padding: 88px 0; }
.section-ink { color: var(--white); background: var(--ink); }
.section-white { background: var(--white); }
.section-mint { background: #dff7f1; }
.section-coral { background: var(--coral); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
}
.section-head h2, .section-head h1 { margin: 0; max-width: 760px; }
.section-head a { font-weight: 900; text-decoration-thickness: 2px; text-underline-offset: 5px; }

h1, h2, h3 { line-height: 1.22; letter-spacing: 0; }
h1 { margin: 0 0 22px; font-size: 70px; font-weight: 950; }
h2 { margin: 0; font-size: 46px; font-weight: 950; }
h3 { margin: 0 0 12px; font-size: 21px; }
p { margin: 0 0 18px; }

.kicker {
  display: inline-block;
  margin-bottom: 18px;
  padding: 4px 10px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: var(--yellow);
  font-size: 14px;
  font-weight: 900;
}

.hero { overflow: hidden; padding: 72px 0 78px; border-bottom: 2px solid var(--ink); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); align-items: center; gap: 72px; }
.hero-copy > p { max-width: 650px; color: #3e464d; font-size: 19px; }
.hero-copy h1 { font-size: 68px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0 30px; }
.micro-trust { display: flex; flex-wrap: wrap; gap: 9px 18px; padding: 0; margin: 0; list-style: none; color: #485159; font-size: 14px; font-weight: 700; }
.micro-trust li::before { content: "✓"; margin-right: 6px; color: var(--mint); font-weight: 950; }

.hero-stage { position: relative; min-height: 540px; }
.hero-stage::before {
  content: "03";
  position: absolute;
  top: 14px;
  right: 0;
  color: var(--yellow);
  font-size: 160px;
  font-weight: 950;
  line-height: 1;
  -webkit-text-stroke: 2px var(--ink);
}
.phone-shot {
  position: absolute;
  width: min(270px, 62%);
  max-width: 400px;
  overflow: hidden;
  border: 3px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}
.phone-shot img { width: 100%; height: auto; }
.phone-main { left: 6%; top: 5px; z-index: 2; transform: rotate(-2deg); }
.phone-side { right: 4%; bottom: 0; z-index: 3; width: min(220px, 52%); transform: rotate(3deg); }
.speech {
  position: absolute;
  right: 3%;
  top: 178px;
  z-index: 4;
  max-width: 180px;
  padding: 11px 14px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  box-shadow: 3px 3px 0 var(--ink);
  font-weight: 900;
  line-height: 1.4;
}

.stat-strip { border-bottom: 2px solid var(--ink); background: var(--white); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 24px 28px; border-left: 2px solid var(--ink); }
.stat:last-child { border-right: 2px solid var(--ink); }
.stat strong { display: block; color: var(--coral); font-size: 26px; line-height: 1.25; }
.stat span { color: var(--muted); font-size: 14px; font-weight: 700; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 2px solid var(--ink); border-left: 2px solid var(--ink); }
.feature {
  min-height: 250px;
  padding: 30px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}
.feature:nth-child(2), .feature:nth-child(6) { background: var(--yellow); }
.feature:nth-child(4) { background: #dff7f1; }
.feature-mark {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 26px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--white);
  background: var(--coral);
  font-weight: 950;
}
.feature p { margin: 0; color: #4c545b; }

.shot-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 18px; align-items: start; }
.shot { margin: 0; }
.shot-frame { overflow: hidden; border: 3px solid var(--white); border-radius: 8px; background: var(--white); box-shadow: 5px 5px 0 var(--coral); }
.shot img { width: 100%; max-width: 400px; height: auto; }
.shot figcaption { margin-top: 14px; font-weight: 900; }
.shot figcaption small { display: block; color: #aeb6bd; font-weight: 500; }

.path-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 22px; }
.path-feature, .path-link {
  border: 2px solid var(--ink);
  border-radius: 8px;
  color: var(--ink);
  background: var(--white);
  box-shadow: 5px 5px 0 var(--ink);
}
.path-feature { padding: 38px; background: var(--sky); }
.path-feature .big-number { color: var(--coral); font-size: 84px; font-weight: 950; line-height: 1; }
.path-feature a, .path-link a { font-weight: 900; text-underline-offset: 5px; }
.path-list { display: grid; gap: 22px; }
.path-link { padding: 25px; }
.path-link:nth-child(2) { background: var(--yellow); }

.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review {
  padding: 26px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
}
.review blockquote { margin: 0 0 20px; font-size: 17px; font-weight: 700; }
.review footer { color: var(--muted); font-size: 14px; }
.stars { color: #e9403a; letter-spacing: 2px; }

.faq-preview { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.faq-preview details, .faq-list details {
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
}
details summary { padding: 18px 52px 18px 20px; cursor: pointer; font-weight: 900; list-style: none; position: relative; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; position: absolute; right: 19px; top: 12px; font-size: 28px; }
details[open] summary::after { content: "−"; }
details p { padding: 0 20px 18px; margin: 0; color: #4d555c; }

.download-band { padding: 60px 0; border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); }
.download-row { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.download-row h2 { font-size: 48px; }
.download-row .btn { flex: 0 0 auto; background: var(--white); color: var(--ink); }

.nav-download[href*="pan.quark.cn"],
a.btn[href*="pan.quark.cn"] {
  color: var(--white);
  background: #21C078;
}

.nav-download[href*="pan.quark.cn"]:hover,
a.btn[href*="pan.quark.cn"]:hover {
  background: #168B59;
}

.site-footer { padding: 48px 0 28px; color: #cfd4d8; background: var(--ink); }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 40px; }
.site-footer .brand { color: var(--white); margin-bottom: 15px; }
.site-footer h3 { color: var(--white); font-size: 16px; }
.footer-links { display: grid; gap: 8px; }
.footer-links a { color: #cfd4d8; text-decoration: none; }
.footer-links a:hover { color: var(--yellow); }
.disclaimer { padding-top: 28px; margin-top: 34px; border-top: 1px solid #4d555e; color: #aeb6bd; font-size: 13px; }
.copyright { margin: 10px 0 0; color: #89929a; font-size: 13px; }

.page-hero { padding: 72px 0 56px; border-bottom: 2px solid var(--ink); background: var(--white); }
.page-hero h1 { max-width: 850px; font-size: 64px; }
.page-hero p { max-width: 780px; color: var(--muted); font-size: 18px; }
.crumbs { margin-bottom: 20px; color: var(--muted); font-size: 14px; }
.crumbs a { color: var(--ink); font-weight: 800; }

.guide-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 54px; align-items: start; }
.guide-steps { display: grid; gap: 0; counter-reset: step; }
.guide-step {
  position: relative;
  padding: 0 0 44px 78px;
  border-left: 3px solid var(--ink);
  counter-increment: step;
}
.guide-step:last-child { border-left-color: transparent; }
.guide-step::before {
  content: counter(step);
  position: absolute;
  left: -27px;
  top: 0;
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  color: var(--white);
  background: var(--coral);
  font-size: 21px;
  font-weight: 950;
}
.guide-step h2 { margin-bottom: 12px; font-size: 28px; }
.guide-step p { color: #4f575e; }
.guide-step ul { padding-left: 20px; }

.side-note { position: sticky; top: 98px; padding: 24px; border: 2px solid var(--ink); border-radius: 8px; background: var(--yellow); box-shadow: 4px 4px 0 var(--ink); }
.side-note ol { margin: 0; padding-left: 20px; }
.side-note a { font-weight: 800; }
.alert { margin: 24px 0; padding: 20px; border-left: 6px solid var(--coral); background: #fff0ee; }
.check-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.check-list li { padding: 13px 15px; border: 1px solid var(--line); background: var(--white); }
.check-list li::before { content: "✓"; margin-right: 9px; color: var(--mint); font-weight: 950; }

.feature-detail { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 38px; padding: 38px 0; border-bottom: 2px solid var(--ink); }
.feature-detail:last-child { border-bottom: 0; }
.feature-label { font-size: 18px; font-weight: 950; }
.feature-label span { display: block; color: var(--coral); font-size: 52px; line-height: 1; }
.feature-copy h2 { margin-bottom: 16px; font-size: 31px; }
.feature-copy h3 { margin-top: 24px; font-size: 18px; }
.feature-copy ul { padding-left: 20px; }
.inline-link { color: var(--coral-dark); font-weight: 900; text-underline-offset: 4px; }

.faq-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 50px; align-items: start; }
.faq-tabs { position: sticky; top: 98px; display: grid; gap: 8px; }
.faq-tabs a { padding: 12px 15px; border-left: 4px solid var(--line); text-decoration: none; font-weight: 800; }
.faq-tabs a:hover { border-color: var(--coral); background: var(--white); }
.faq-group { margin-bottom: 48px; scroll-margin-top: 100px; }
.faq-group h2 { margin-bottom: 20px; font-size: 31px; }
.faq-list { display: grid; gap: 12px; }

.seo-copy { max-width: 850px; }
.seo-copy h2 { margin: 42px 0 18px; font-size: 30px; }
.seo-copy h2:first-child { margin-top: 0; }
.seo-copy p { color: #454d54; }

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-stage { width: min(100%, 620px); margin: 0 auto; }
  .shot-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-layout, .faq-layout { grid-template-columns: 1fr; }
  .side-note, .faq-tabs { position: static; }
  .faq-tabs { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  body { font-size: 15px; }
  h1 { font-size: 46px; }
  h2 { font-size: 34px; }
  .hero-copy h1 { font-size: 44px; }
  .page-hero h1 { font-size: 46px; }
  .download-row h2 { font-size: 38px; }
  .section { padding: 62px 0; }
  .nav-wrap { min-height: 64px; }
  .menu-toggle { display: grid; place-items: center; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 64px;
    display: none;
    padding: 12px 16px 18px;
    border-bottom: 2px solid var(--ink);
    background: var(--paper);
    box-shadow: 0 10px 18px rgba(32, 37, 44, .12);
  }
  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 12px; }
  .nav-download { display: none; }
  .hero { padding: 50px 0 46px; }
  .hero-stage { min-height: 270px; max-height: 270px; overflow: hidden; }
  .hero-stage::before { font-size: 115px; }
  .phone-shot { width: 55%; }
  .phone-side { width: 45%; }
  .speech { top: 138px; max-width: 145px; font-size: 13px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 2px solid var(--ink); }
  .stat:nth-child(-n+2) { border-bottom: 2px solid var(--ink); }
  .feature-grid, .path-grid, .review-grid, .faq-preview { grid-template-columns: 1fr; }
  .shot-grid { display: flex; overflow-x: auto; gap: 16px; padding: 0 16px 18px; margin: 0 -16px; scroll-snap-type: x mandatory; }
  .shot { min-width: 230px; scroll-snap-align: start; }
  .download-row { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .feature-detail { grid-template-columns: 1fr; gap: 15px; }
  .feature-label span { display: inline; margin-right: 8px; font-size: 28px; }
  .guide-step { padding-left: 55px; }
  .faq-tabs { grid-template-columns: 1fr 1fr; }
  .section-head { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 430px) {
  .container, .nav-wrap { width: min(calc(100% - 24px), var(--content)); }
  h1 { font-size: 40px; }
  h2 { font-size: 31px; }
  .hero-copy h1 { font-size: 40px; }
  .page-hero h1 { font-size: 40px; }
  .download-row h2 { font-size: 34px; }
  .hero-actions .btn { width: 100%; }
  .hero-stage { min-height: 240px; max-height: 240px; }
  .phone-main { left: 1%; }
  .phone-side { right: 1%; }
  .speech { right: 0; top: 120px; }
  .stat { padding: 18px 14px; }
  .stat strong { font-size: 21px; }
  .feature { min-height: auto; padding: 24px; }
  .faq-tabs { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}