:root {
  --bg: #f5f7fb;
  --paper: #ffffff;
  --ink: #0f172a;
  --muted: #5f6a7a;
  --line: #dfe7f2;
  --blue: #4f6fef;
  --blue-dark: #3f59d6;
  --green: #16a085;
  --orange: #e39e42;
  --red: #e85f5f;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: linear-gradient(180deg, #f8fbff 0%, #f3f5fb 180px, #f5f7fb 100%);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
}

a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
h1, h2, h3, p { margin: 0; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  min-height: 72px;
  padding: 0 18px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(248, 250, 255, 0.9);
  backdrop-filter: blur(8px);
}
.brand { display: inline-flex; gap: 12px; align-items: center; }
.brand-mark {
  width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; background: linear-gradient(135deg, #5c7bff, #1cb5ff); color: #fff; font-weight: 700;
}
.brand small { color: var(--muted); font-size: 12px; display: block; }
nav { display: flex; gap: 16px; color: var(--muted); font-size: 14px; }
.nav-cta {
  display: inline-grid; height: 40px; padding: 0 14px; border-radius: 10px;
  place-items: center; background: var(--blue); color: #fff; font-weight: 700;
}

main { width: min(1200px, calc(100% - 32px)); margin: 0 auto; padding: 24px 0 80px; }
main > section { margin-top: 28px; }
.hero {
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 26px; align-items: stretch;
}
.hero-copy, .hero-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); padding: 24px;
}
.eyebrow { color: var(--blue); font-size: 13px; font-weight: 700; margin-bottom: 8px; }
h1 { font-size: clamp(34px, 4.2vw, 54px); line-height: 1.08; }
.lead { margin: 12px 0 14px; color: var(--muted); font-size: 18px; line-height: 1.8; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.hero-tags span, .pill-group span, .compare-findings span { border: 1px solid var(--line); border-radius: 999px; padding: 7px 11px; font-size: 12px; color: #3f4b66; background: #f8fbff; }
.hero-actions, .action-row, .pay-methods { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }

.button {
  height: 42px; border-radius: 10px; border: 0; padding: 0 16px; font-weight: 700; cursor: pointer;
}
.button.primary { background: var(--blue); color: white; }
.button.ghost { background: white; color: var(--ink); border: 1px solid var(--line); }
.button.pay { background: var(--red); color: white; }
.button:disabled { opacity: .52; cursor: not-allowed; }

.metric-title { color: var(--muted); font-weight: 600; margin-bottom: 4px; }
.hero-card h2 { margin-top: 6px; color: var(--blue); font-size: 44px; }
.trust-note { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.action-note { margin: 8px 0 0; color: var(--muted); font-size: 12px; }

.data-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.data-wall article {
  background: linear-gradient(180deg, #fff, #f8fbff); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px; min-height: 122px;
}
.data-wall strong { display: block; font-size: 32px; color: var(--blue-dark); margin-top: 4px; }

.cards-2, .pricing { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.pricing { grid-template-columns: repeat(4, 1fr); }
.card, .pricing article {
  background: var(--paper); border-radius: 14px; border: 1px solid var(--line); box-shadow: var(--shadow);
  padding: 18px;
}
.card ul, .pricing ul { margin: 12px 0; padding-left: 18px; color: #2f3b4f; line-height: 1.8; }
.card .subtitle, .pricing .small { color: var(--muted); font-size: 13px; }
.price { font-size: 28px; color: var(--blue); display: inline-block; margin: 12px 0; }
.pricing article { display: flex; flex-direction: column; }
.pricing .highlight { border-color: #bfd4ff; outline: 2px solid rgba(79,111,239,0.12); }

.split h2, .sample h2, .pain h2, .cases h2, .faq h2, .workflow h2 { margin-bottom: 16px; }
.compare-grid, .case-grid, .sample-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.compare-grid div, .case-grid article, .sample-grid > div {
  background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 16px;
}
.compare-findings, .hero-actions, .pill-group { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.sample p { margin: 10px 0; }

.pain .pill-group { margin-bottom: 10px; }
.pricing .small { margin-top: 8px; }

.seo-insights h2 { margin-bottom: 16px; }
.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.insight-grid article { padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.insight-grid h3 { font-size: 16px; margin: 0 0 10px; }
.insight-grid ul { margin: 0; padding-left: 18px; color: var(--muted); line-height: 1.7; }

.cases article { min-height: 180px; }

.faq details {
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin-bottom: 10px; background: white;
}
.faq summary { font-weight: 700; cursor: pointer; }
.faq p { margin-top: 8px; color: var(--muted); }

.workflow {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 16px;
}
.value-card {
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 12px;
}
.value-card h3 { font-size: 16px; margin-bottom: 8px; }
.value-card p.small { margin: 4px 0 0; }
.diagnosis-form.hidden { display: none; }
.workflow label { display: grid; gap: 8px; margin-bottom: 12px; color: #334155; }
input, textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
  background: #fff; min-height: 40px;
}
textarea { min-height: 92px; resize: vertical; }
.action-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }

.preview-box {
  border: 1px solid var(--line); border-radius: 12px; padding: 14px; background: #fff;
  min-height: 260px; margin-bottom: 12px;
}
.hidden { display: none !important; }
.footer-note { color: var(--muted); font-size: 12px; }
.small-note { color: var(--muted); font-size: 12px; margin-top: 8px; line-height: 1.6; }

.pay-modal {
  position: fixed;
  inset: 0;
  z-index: 12;
  display: grid;
  place-items: center;
  background: rgba(9, 13, 29, 0.32);
}
.pay-modal.hidden { display: none; }
.pay-modal-card {
  width: min(440px, calc(100% - 40px));
  background: #fff;
  border-radius: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.pay-methods .button { flex: 1; }
#payQrWrap { text-align: center; margin-top: 12px; display: grid; gap: 8px; }
#payQrImage { width: 190px; height: 190px; object-fit: contain; margin: 0 auto; display: block; }
#alipayLink { display: inline-block; margin-top: 8px; color: var(--blue); }

.notice {
  position: fixed;
  left: 50%;
  top: 14px;
  z-index: 20;
  transform: translateX(-50%) translateY(-12px);
  background: #111827;
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  opacity: 0;
  transition: all .2s ease;
}
.notice.show { transform: translateX(-50%) translateY(0); opacity: .95; }

@media (max-width: 960px) {
  .hero, .compare-grid, .sample-grid, .case-grid, .cards-2, .pricing, .workflow { grid-template-columns: 1fr; }
  .insight-grid { grid-template-columns: 1fr; }
  .data-wall { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topbar { grid-template-columns: 1fr auto; grid-template-areas: "brand cta" "nav nav"; }
  nav { grid-area: nav; padding: 8px 0 12px; }
  .nav-cta { grid-area: cta; }
}

@media (max-width: 560px) {
  .data-wall { grid-template-columns: 1fr; }
}