:root {
  --ink: #17202a;
  --muted: #64748b;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --line: #e8e1d5;
  --red: #d6342f;
  --jade: #0b7f78;
  --gold: #f7bd46;
  --shadow: 0 22px 70px rgba(23, 32, 42, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Inter, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
.site-header { background: rgba(251,250,247,.92); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 30; backdrop-filter: blur(14px); }
.nav { align-items: center; display: flex; gap: 20px; justify-content: space-between; margin: 0 auto; max-width: 1180px; padding: 14px 24px; }
.brand { align-items: center; display: flex; font-weight: 900; gap: 10px; }
.brand-mark { align-items: center; background: var(--red); border-radius: 8px; color: #fff; display: inline-flex; height: 36px; justify-content: center; width: 36px; }
.nav-links { align-items: center; display: flex; gap: 20px; color: #334155; font-weight: 800; }
.button { align-items: center; background: #fff; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); cursor: pointer; display: inline-flex; font-weight: 900; justify-content: center; min-height: 46px; padding: 11px 16px; }
.button.primary { background: var(--red); border-color: var(--red); color: #fff; box-shadow: 0 12px 30px rgba(214,52,47,.22); }
.hero, .section { padding: 70px 24px; }
.wrap { margin: 0 auto; max-width: 1180px; }
.hero-grid { align-items: center; display: grid; gap: 48px; grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr); }
.eyebrow { color: var(--jade); font-size: 14px; font-weight: 900; letter-spacing: .08em; margin: 0 0 12px; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(42px, 6vw, 72px); letter-spacing: 0; line-height: 1; margin-bottom: 22px; }
h2 { font-size: clamp(30px, 4vw, 50px); line-height: 1.08; margin-bottom: 14px; }
.lead { color: var(--muted); font-size: 20px; max-width: 720px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.proof-row { display: grid; gap: 14px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 32px; max-width: 760px; }
.proof { border-left: 3px solid var(--gold); padding-left: 14px; }
.proof strong { display: block; font-size: 28px; line-height: 1; }
.proof span, .card p, .timeline p, .faq p { color: var(--muted); }
.hero-card { background: #fff; border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow); overflow: hidden; }
.hero-card-top { background: linear-gradient(135deg, #17202a, #0b7f78); color: #fff; padding: 28px; }
.hero-card-top h2 { font-size: 32px; }
.checklist { display: grid; gap: 12px; list-style: none; margin: 0; padding: 0; }
.checklist li { background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.16); border-radius: 8px; padding: 12px; }
.hero-card-body { padding: 26px; }
.section-title { margin-bottom: 32px; max-width: 760px; }
.grid { display: grid; gap: 18px; }
.cards-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card, .quiz-panel, .timeline, .pricing-card, .faq, .lead-panel { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 26px; }
.card h3 { font-size: 24px; margin-bottom: 10px; }
.card-tag { background: #f8f5ef; border-radius: 8px; color: var(--red); display: inline-flex; font-weight: 900; margin-bottom: 14px; padding: 6px 10px; }
.band { background: #17202a; color: #fff; }
.band .lead, .band .section-title p, .band .card p { color: #cbd5e1; }
.band .card { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.14); }
.quiz-panel { display: grid; gap: 16px; }
.quiz-panel label { display: grid; gap: 8px; font-weight: 900; }
.quiz-panel select, .quiz-panel input, .quiz-panel textarea { background: #f8f5ef; border: 1px solid var(--line); border-radius: 8px; min-height: 48px; padding: 10px 12px; width: 100%; }
.quiz-result { background: #f8f5ef; border-left: 4px solid var(--jade); border-radius: 8px; display: none; font-weight: 900; padding: 16px; }
.quiz-result.show { display: block; }
.timeline { display: grid; gap: 18px; }
.step { display: grid; gap: 16px; grid-template-columns: 54px 1fr; }
.step-number { align-items: center; background: var(--red); border-radius: 8px; color: #fff; display: inline-flex; font-size: 20px; font-weight: 900; height: 54px; justify-content: center; width: 54px; }
.pricing { display: grid; gap: 18px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.price { font-size: 34px; font-weight: 900; margin: 12px 0; }
.faq details { border-bottom: 1px solid var(--line); padding: 16px 0; }
.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; font-size: 19px; font-weight: 900; }
.lead-panel { align-items: center; display: grid; gap: 26px; grid-template-columns: minmax(0, 1fr) clamp(190px, 20vw, 250px); }
.wechat-card {
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 8px;
  justify-self: end;
  padding: 12px;
  text-align: center;
  width: min(100%, clamp(190px, 20vw, 250px));
}
.wechat-card img { border: 1px solid var(--line); border-radius: 8px; width: 100%; }
.wechat-card span { color: var(--muted); font-size: 13px; font-weight: 800; }
.footer { color: var(--muted); padding: 28px 24px; }
.fixed-qr {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  bottom: 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 8px;
  padding: 12px;
  position: fixed;
  right: 18px;
  text-align: center;
  width: clamp(128px, 10vw, 168px);
  z-index: 70;
}

.fixed-qr.is-highlighted {
  animation: qrPulse 900ms ease;
}

@keyframes qrPulse {
  0% { transform: scale(1); box-shadow: var(--shadow); }
  45% { transform: scale(1.08); box-shadow: 0 24px 80px rgba(17,178,91,.34); border-color: #11b25b; }
  100% { transform: scale(1); box-shadow: var(--shadow); }
}
.fixed-qr img {
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 100%;
}
.fixed-qr span {
  color: var(--muted);
  font-size: 12px;
}
.tool-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.tool-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}
.tool-card form,
.tool-card .field-stack {
  display: grid;
  gap: 12px;
}
.tool-card label {
  display: grid;
  gap: 8px;
  font-weight: 900;
}
.tool-card input,
.tool-card select,
.tool-card textarea {
  background: #f8f5ef;
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 46px;
  padding: 10px 12px;
  width: 100%;
}
.tool-output {
  background: #f8f5ef;
  border-left: 4px solid var(--jade);
  border-radius: 8px;
  display: none;
  margin-top: 14px;
  padding: 16px;
}
.tool-output.show {
  display: block;
}
.activity-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}
.activity-tags span {
  background: #f8f5ef;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 900;
  padding: 8px 12px;
}
.resource-list {
  display: grid;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.resource-list li {
  background: #f8f5ef;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}
.keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.keyword-cloud span {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #334155;
  font-weight: 800;
  padding: 8px 12px;
}
.seo-article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}
@media (max-width: 900px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .nav-links { flex-wrap: wrap; }
  .hero-grid, .cards-3, .cards-2, .pricing, .lead-panel { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; }
  .proof-row { grid-template-columns: 1fr; }
  .fixed-qr {
    inset: auto 12px 12px auto;
    width: clamp(104px, 26vw, 132px);
  }
  .fixed-qr span {
    display: none;
  }
}