:root {
  --bg: #f7faf7;
  --surface: #ffffff;
  --surface-muted: #eef5f0;
  --text: #12201b;
  --text-muted: #5b6f68;
  --text-soft: #7e9089;
  --border: #d9e4de;
  --accent: #157a52;
  --accent-strong: #0f5f41;
  --accent-soft: #dff1e8;
  --warning: #925d20;
  --shadow: 0 18px 50px rgba(19, 47, 37, 0.1);
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
}

.site-header {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 4vw, 56px);
  background: rgba(247, 250, 247, 0.86);
  border-bottom: 1px solid rgba(217, 228, 222, 0.72);
  backdrop-filter: blur(18px);
}

.site-header.compact {
  position: sticky;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 850;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 900;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 20px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 750;
}

.hero {
  position: relative;
  min-height: 88vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(247, 250, 247, 0.96) 0%, rgba(247, 250, 247, 0.86) 34%, rgba(247, 250, 247, 0.18) 70%);
}

.hero-content {
  position: relative;
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 72px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 14px;
  font-weight: 850;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  margin: 12px 0 0;
  max-width: 580px;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.02;
}

.hero-copy {
  max-width: 560px;
  margin: 22px 0 0;
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.8;
  font-weight: 650;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 0 18px;
  font-size: 14px;
  font-weight: 850;
}

.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow);
}

.button.secondary {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.76);
  color: var(--text);
}

.section {
  padding: 76px clamp(20px, 4vw, 56px);
}

.section > * {
  width: min(var(--max), 100%);
  margin-left: auto;
  margin-right: auto;
}

.section.muted {
  background: var(--surface-muted);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  display: grid;
  gap: 10px;
  margin-bottom: 28px;
}

.section-header h2,
.wechat-band h2 {
  margin: 0;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.18;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  color: var(--text-muted);
  font-size: 17px;
  font-weight: 650;
  line-height: 1.85;
}

.intro-grid p {
  margin: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  min-height: 232px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(19, 47, 37, 0.06);
}

.feature-index {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
}

.feature-card h3 {
  margin: 0;
  font-size: 18px;
}

.feature-card p {
  margin: 12px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 650;
  line-height: 1.75;
}

.workflow-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin-top: 0;
  list-style: none;
}

.workflow-list li {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-height: 72px;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.workflow-list strong {
  font-size: 17px;
}

.workflow-list span {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 650;
  line-height: 1.65;
}

.wechat-band {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 38px;
  align-items: center;
  padding: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.wechat-band p:not(.eyebrow) {
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 650;
  line-height: 1.8;
}

.assurance-list {
  display: grid;
  gap: 10px;
}

.assurance-list span {
  min-height: 44px;
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 0 14px;
  font-size: 14px;
  font-weight: 850;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.info-grid div {
  min-height: 112px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.info-grid span {
  display: block;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 850;
}

.info-grid strong {
  display: block;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.55;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(20px, 4vw, 56px);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 750;
}

.site-footer span {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 16px;
}

.legal-page {
  padding: 64px clamp(20px, 4vw, 56px) 80px;
}

.legal-hero,
.legal-content {
  width: min(860px, 100%);
  margin: 0 auto;
}

.legal-hero {
  padding: 46px 0 28px;
}

.legal-hero h1 {
  font-size: clamp(34px, 5vw, 58px);
}

.legal-hero p:not(.eyebrow) {
  color: var(--text-muted);
  font-weight: 700;
}

.legal-content {
  padding: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.legal-content h2 {
  margin: 26px 0 10px;
  font-size: 20px;
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content p {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 650;
  line-height: 1.85;
}

@media (max-width: 900px) {
  .site-header {
    position: sticky;
  }

  .nav-links {
    display: none;
  }

  .hero {
    min-height: 76vh;
  }

  .hero-overlay {
    background: rgba(247, 250, 247, 0.88);
  }

  .intro-grid,
  .wechat-band {
    grid-template-columns: 1fr;
  }

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

  .workflow-list li {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .hero-content {
    padding-top: 64px;
  }

  .hero-copy {
    font-size: 16px;
  }

  .card-grid,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .wechat-band,
  .legal-content {
    padding: 22px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}