:root {
  --bg: #f4f1ea;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: #ffffff;
  --text: #17212b;
  --muted: #5c6773;
  --accent: #0f766e;
  --accent-dark: #0a4f4a;
  --line: rgba(23, 33, 43, 0.08);
  --shadow: 0 20px 60px rgba(23, 33, 43, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.18), transparent 28%),
    linear-gradient(180deg, #f8f4ed 0%, #f2efe8 100%);
}

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

.hero {
  padding: 24px;
}

.nav,
.hero-content,
.section,
.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 20px;
  color: var(--muted);
}

.hero-content {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 28px;
  padding: 56px 0 24px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1.05;
  margin-bottom: 18px;
}

.summary {
  max-width: 620px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 28px;
}

.actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 180ms ease, background-color 180ms ease;
}

.btn:hover,
.footer-btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
}

.hero-card,
.feature-card,
.panel {
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 24px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  color: var(--muted);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #22c55e;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.stat {
  padding: 18px;
  border-radius: 18px;
  background: #f5f8f7;
}

.stat strong {
  display: block;
  font-size: 1.7rem;
  margin-bottom: 8px;
}

.stat span {
  color: var(--muted);
}

.section {
  padding: 48px 0;
}

.section-heading {
  margin-bottom: 22px;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

.feature-grid,
.overview-layout {
  display: grid;
  gap: 20px;
}

.feature-grid {
  grid-template-columns: repeat(4, 1fr);
}

.feature-card,
.panel {
  padding: 24px;
}

.feature-card p,
.panel li {
  color: var(--muted);
  line-height: 1.7;
}

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

.quick-list,
.notice-list {
  margin: 0;
  padding-left: 18px;
}

.quick-list li,
.notice-list li {
  margin-bottom: 12px;
}

.footer {
  padding: 12px 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
}

.footer-btn {
  border: none;
  background: var(--accent-dark);
  color: #fff;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  font: inherit;
  transition: transform 180ms ease, opacity 180ms ease;
}

@media (max-width: 960px) {
  .hero-content,
  .feature-grid,
  .overview-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 16px;
  }

  .nav,
  .footer {
    width: min(1120px, calc(100% - 16px));
  }

  .nav {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links,
  .actions,
  .footer {
    flex-direction: column;
    align-items: stretch;
  }

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