/* ============================================================
   AdxDesk 中国站 — strict monochrome + one accent
   type: system Chinese sans (display/body) × ui-monospace (readouts)
   ============================================================ */

:root {
  --bg: #ffffff;
  --ink: #000000;
  --gray: #555555;
  --faint: #999999;
  --line: #dddddd;
  --dark: #0a0a0a;
  --dark-ink: #b7b7b7;
  --accent: #f7e54e;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--mono); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: baseline;
  gap: 32px;
  padding: 18px 5vw;
  background: var(--bg);
  border-bottom: 1px solid var(--ink);
}
.wordmark {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.03em;
  color: var(--ink);
  text-decoration: none;
}
.dot-cn { color: var(--gray); font-weight: 400; }
.site-nav { display: flex; gap: 22px; flex: 1; flex-wrap: wrap; }
.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color .15s ease;
}
.site-nav a:hover { border-color: var(--ink); }
.clock { font-size: 13px; color: var(--gray); letter-spacing: .08em; white-space: nowrap; }

/* ---------- hero ---------- */
.hero { padding: 9vh 5vw 8vh; border-bottom: 1px solid var(--ink); }
.eyebrow {
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(46px, 9.5vw, 128px);
  line-height: 1.04;
  letter-spacing: -0.045em;
  font-weight: 800;
  margin: 0 0 36px -0.05em;
}
.strike-hype { position: relative; white-space: nowrap; }
.strike-hype::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  top: 54%;
  height: 0.09em;
  background: var(--accent);
  box-shadow: 0 0 0 .06em var(--accent);
}
.hero-lede { max-width: 44em; color: var(--gray); font-size: 18px; }

.hero-ctas { display: flex; gap: 16px; margin: 40px 0 56px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  padding: 14px 28px;
  border: 2px solid var(--ink);
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 4px 4px 0 rgba(0,0,0,.25);
}
.btn-primary:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0 rgba(0,0,0,.25); background: #222; }
.btn-ghost { background: var(--bg); color: var(--ink); }
.btn-ghost:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0 var(--accent); }

.hero-facts { list-style: none; max-width: 560px; margin-bottom: 40px; }
.hero-facts li, .spec-sheet li, .contact-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 14px;
}
.hero-facts span:first-child { color: var(--gray); }
.leader {
  flex: 1;
  border-bottom: 2px dotted var(--line);
  transform: translateY(-4px);
  min-width: 24px;
}
.hero-facts span:last-child { font-weight: 700; }

.hero-note {
  max-width: 44em;
  font-size: 14.5px;
  color: var(--gray);
  border-left: 4px solid var(--accent);
  padding-left: 16px;
}

/* ---------- sections ---------- */
.section { padding: 9vh 5vw; border-bottom: 1px solid var(--ink); }
.section h2 {
  font-size: clamp(30px, 4.5vw, 52px);
  letter-spacing: -0.03em;
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 22px;
  max-width: 20em;
}
.section-lede { max-width: 44em; color: var(--gray); margin-bottom: 48px; }
.subhead {
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gray);
  margin: 64px 0 12px;
}

/* dark sections: muted gray ink, one accent */
.section-dark { background: var(--dark); color: var(--dark-ink); border-bottom: 1px solid var(--dark); }
.section-dark h2 { color: #fff; }
.section-dark .section-lede, .section-dark .eyebrow { color: var(--dark-ink); }
.section-dark .spec-sheet { max-width: 720px; }
.section-dark .spec-sheet span:first-child { color: var(--dark-ink); }
.section-dark .spec-sheet b { color: #fff; }
.section-dark .leader { border-color: #333; }

/* ---------- checker ---------- */
.checker { max-width: 720px; }
.q-list { list-style: none; }
.q { padding: 26px 0; border-bottom: 1px dashed var(--line); }
.q-title { font-weight: 700; margin-bottom: 12px; }
.q label {
  display: block;
  padding: 8px 12px;
  margin: 4px 0;
  cursor: pointer;
  border: 1px solid transparent;
  transition: border-color .12s ease, background .12s ease;
}
.q label:hover { border-color: var(--ink); }
.q input[type="radio"] { margin-right: 10px; accent-color: #000; }
.q input[type="radio"]:checked + span, .q label:has(input:checked) { background: var(--accent); }

.checker-actions { display: flex; gap: 14px; margin: 36px 0; }

.checker-result {
  border: 2px solid var(--ink);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: 8px 8px 0 var(--accent);
}
.checker-result .btn { margin-top: 20px; }
.cr-label { font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--gray); margin-bottom: 10px; }
.cr-verdict { font-size: 24px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 14px; }
.cr-notes { list-style: none; color: var(--gray); font-size: 15px; }
.cr-notes li { padding: 4px 0 4px 20px; position: relative; }
.cr-notes li::before { content: "▸"; position: absolute; left: 0; color: var(--ink); }

/* ---------- steps ---------- */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 0; border: 1px solid var(--ink); }
.step { padding: 32px 28px; border-right: 1px solid var(--ink); }
.step:last-child { border-right: none; }
.step-num { font-size: 40px; font-weight: 700; letter-spacing: -0.04em; color: var(--faint); display: block; margin-bottom: 18px; }
.step h3 { font-size: 19px; margin-bottom: 10px; }
.step p { font-size: 14.5px; color: var(--gray); }

.spec-sheet { list-style: none; max-width: 560px; }
.spec-sheet b { font-weight: 700; }

/* ---------- don't list ---------- */
.dont-list { list-style: none; max-width: 820px; }
.dont-list li { display: flex; gap: 20px; padding: 26px 0; border-bottom: 1px solid #222; }
.dont-list li:last-child { border-bottom: none; }
.dont-mark { color: var(--accent); font-size: 22px; font-weight: 700; line-height: 1.6; }
.dont-list b { color: #fff; font-size: 18px; }
.dont-list p { color: var(--dark-ink); font-size: 15px; margin-top: 6px; }

/* ---------- compare table ---------- */
.table-wrap { max-width: 720px; overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; font-size: 16px; }
.compare-table th, .compare-table td { border: 1px solid var(--ink); padding: 16px 20px; text-align: left; }
.compare-table thead th { font-family: var(--mono); font-size: 14px; letter-spacing: .06em; }
.compare-table .hl { background: var(--accent); font-weight: 700; }

/* ---------- fit grid ---------- */
.fit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--ink); max-width: 960px; }
.fit-col { padding: 36px 32px; }
.fit-col h3 { font-size: 14px; letter-spacing: .14em; margin-bottom: 20px; }
.fit-yes { border-right: 1px solid var(--ink); }
.fit-yes h3 { color: var(--ink); }
.fit-no h3 { color: var(--gray); }
.fit-col ul { list-style: none; }
.fit-col li { padding: 9px 0 9px 22px; position: relative; font-size: 15.5px; border-bottom: 1px dashed var(--line); }
.fit-col li:last-child { border-bottom: none; }
.fit-yes li::before { content: "■"; position: absolute; left: 0; font-size: 10px; top: 15px; }
.fit-no li::before { content: "✕"; position: absolute; left: 0; font-size: 13px; color: var(--gray); top: 11px; }
.fit-no li { color: var(--gray); }

/* ---------- FAQ ---------- */
.faq details, details { max-width: 760px; border-bottom: 1px solid var(--ink); }
details summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 17.5px;
  padding: 22px 36px 22px 0;
  list-style: none;
  position: relative;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 18px;
  font-family: var(--mono);
  font-size: 22px;
  transition: transform .15s ease;
}
details[open] summary::after { transform: rotate(45deg); }
details p { color: var(--gray); padding: 0 0 24px; max-width: 40em; }

/* ---------- CTA / contact ---------- */
.section-cta { text-align: left; }
.section-cta .hero-ctas { margin-bottom: 48px; }
.contact-list { list-style: none; max-width: 480px; }
.contact-list a { color: var(--ink); }
.wechat-qr { display: inline-block; width: 44px; height: 44px; border-radius: 6px; vertical-align: middle; transform-origin: right center; transition: transform .18s ease; }
a:hover .wechat-qr, a:focus-visible .wechat-qr { transform: scale(3); box-shadow: 0 10px 32px rgba(0, 0, 0, .35); }

/* ---------- footer ---------- */
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 28px 5vw;
  font-size: 13px;
  color: var(--gray);
  background: var(--bg);
}
.site-footer .mono { letter-spacing: .04em; color: var(--ink); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .site-header { gap: 14px; padding: 14px 5vw; }
  .site-nav { order: 3; width: 100%; gap: 14px; }
  .clock { display: none; }
  .steps { grid-template-columns: 1fr; }
  .step { border-right: none; border-bottom: 1px solid var(--ink); }
  .step:last-child { border-bottom: none; }
  .fit-grid { grid-template-columns: 1fr; }
  .fit-yes { border-right: none; border-bottom: 1px solid var(--ink); }
  .checker-actions .btn { width: 100%; text-align: center; }
  .checker-result { box-shadow: 5px 5px 0 var(--accent); }
  .hero-title { letter-spacing: -0.035em; }
}