:root {
  --bg: #f7faf9;
  --surface: #ffffff;
  --surface-soft: #eef6f6;
  --text: #122025;
  --muted: #5b6b73;
  --line: #d9e5e5;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #2563eb;
  --accent-soft: #e8f0ff;
  --warning: #b45309;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  line-height: 1.7;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  color: var(--brand-dark);
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 250, 249, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 34px;
  height: 34px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--surface-soft);
  color: var(--brand-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--brand);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  color: #ffffff;
  background: var(--brand-dark);
  box-shadow: 0 10px 24px rgba(15, 118, 110, 0.22);
  transform: translateY(-1px);
}

.btn.secondary {
  background: var(--surface);
  color: var(--brand-dark);
  border-color: var(--line);
}

.btn.secondary:hover {
  background: var(--surface-soft);
  color: var(--brand-dark);
  box-shadow: none;
}

.btn.ghost {
  background: transparent;
  color: var(--brand-dark);
  border-color: var(--line);
}

.hero {
  padding: 72px 0 46px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #f7faf9 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--brand-dark);
  font-size: 14px;
  font-weight: 800;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--brand);
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(26px, 3vw, 38px);
}

h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.lead {
  margin: 20px 0 0;
  max-width: 690px;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions,
.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.metric {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.metric strong {
  display: block;
  color: var(--brand-dark);
  font-size: 22px;
}

.metric span {
  color: var(--muted);
  font-size: 14px;
}

.hero-visual {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-visual figcaption {
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 62px 0;
}

.section.alt {
  background: #ffffff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  max-width: 780px;
  margin-bottom: 30px;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.card.soft {
  background: var(--surface-soft);
}

.card p,
.card li {
  color: var(--muted);
}

.icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 16px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--brand-dark);
}

.icon-box svg {
  width: 22px;
  height: 22px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 32px;
  align-items: start;
}

.check-list {
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin: 10px 0;
  padding-left: 28px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: inset 0 0 0 4px #d9f7ee;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

th,
td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-soft);
  color: var(--text);
  font-size: 14px;
}

td {
  color: var(--muted);
}

tr:last-child td {
  border-bottom: 0;
}

.download-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.download-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.download-meta {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #1d4ed8;
  font-size: 13px;
  font-weight: 700;
}

.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--warning);
  border-radius: var(--radius);
  background: #fff7ed;
  color: #7c2d12;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question span:last-child {
  color: var(--brand);
}

.faq-answer {
  display: none;
  padding: 0 20px 20px;
  color: var(--muted);
}

.faq-item.is-open .faq-answer {
  display: block;
}

.cta-band {
  padding: 40px;
  border-radius: var(--radius);
  background: #0f2f2d;
  color: #ffffff;
}

.cta-band p {
  color: #cde7e4;
}

.cta-band .btn.secondary {
  background: #ffffff;
}

.site-footer {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  background: #0b1518;
  color: #cbd5e1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(2, minmax(0, 0.7fr));
  gap: 28px;
}

.site-footer h2,
.site-footer h3 {
  color: #ffffff;
  font-size: 18px;
}

.site-footer p,
.site-footer a {
  color: #a9b8c2;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-note {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #8da1ad;
  font-size: 14px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.is-open {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 6, 23, 0.62);
}

.modal-dialog {
  position: relative;
  width: min(880px, 100%);
  max-height: calc(100vh - 40px);
  overflow: auto;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.25);
}

.modal-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 26px;
  border-bottom: 1px solid var(--line);
}

.modal-head p {
  margin: 6px 0 0;
  color: var(--muted);
}

.modal-close {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 24px 26px;
}

.qr-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  text-align: center;
}

.qr-card img {
  width: 148px;
  height: 148px;
  margin: 0 auto 14px;
  border: 8px solid #ffffff;
}

.qr-card h3 {
  font-size: 18px;
}

.qr-card p {
  color: var(--muted);
  font-size: 14px;
}

.modal-foot {
  padding: 0 26px 24px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 72px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    width: 100%;
  }

  .hero-grid,
  .split,
  .grid.three,
  .grid.two,
  .download-panel,
  .footer-grid,
  .qr-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 46px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  h1 {
    font-size: 34px;
  }

  .section {
    padding: 46px 0;
  }

  .hero-actions,
  .section-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .cta-band {
    padding: 26px;
  }

  .modal-head,
  .qr-grid,
  .modal-foot {
    padding-left: 18px;
    padding-right: 18px;
  }
}