:root {
  --bg: #f6fbfa;
  --card: #ffffff;
  --text: #172633;
  --muted: #667784;
  --line: #dcebe8;
  --accent: #19b8a6;
  --accent-soft: #e6f7f4;
  --shadow: 0 18px 45px rgba(20, 80, 72, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8fdfc 0%, var(--bg) 100%);
  line-height: 1.7;
}

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(248, 253, 252, 0.86);
  border-bottom: 1px solid rgba(220, 235, 232, 0.8);
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #77ddd3);
  box-shadow: 0 10px 25px rgba(25, 184, 166, 0.28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
  color: var(--muted);
  flex-wrap: wrap;
}

.nav-links a:hover {
  color: var(--accent);
}

.hero {
  padding: 86px 0 54px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.badge {
  display: inline-flex;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(255, 255, 255, 0.72);
  font-weight: 700;
  font-size: 14px;
}

h1 {
  margin: 22px 0 14px;
  font-size: clamp(42px, 8vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 18px;
}

.hero-card,
.card,
.article,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-card {
  border-radius: 28px;
  padding: 28px;
}

.hero-card h2,
.card h3 {
  margin-top: 0;
}

.section {
  padding: 42px 0;
}

.section-title {
  margin: 0 0 18px;
  font-size: 30px;
  letter-spacing: -0.02em;
}

.section-desc {
  max-width: 760px;
  margin: 0 0 28px;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.card {
  border-radius: 22px;
  padding: 22px;
}

.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-weight: 900;
  margin-bottom: 14px;
}

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

.panel {
  border-radius: 28px;
  padding: 30px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #148f82;
  font-weight: 700;
  font-size: 14px;
}

.page {
  padding: 54px 0 72px;
}

.article {
  border-radius: 28px;
  padding: 34px;
}

.article h1 {
  margin-top: 0;
  font-size: clamp(34px, 6vw, 52px);
}

.article h2 {
  margin-top: 34px;
  font-size: 22px;
}

.article ul {
  padding-left: 22px;
}

.notice {
  padding: 16px 18px;
  border-radius: 18px;
  background: var(--accent-soft);
  color: #147b70;
  border: 1px solid #c8efea;
}

.site-footer {
  margin-top: 42px;
  padding: 30px 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding: 56px 0 34px;
  }

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

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

  .article {
    padding: 24px;
  }
}

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

  .lead {
    font-size: 16px;
  }
}