:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-muted: #e8f3f0;
  --text: #20242a;
  --muted: #646b73;
  --line: #d9d5cc;
  --brand: #1f7a68;
  --brand-dark: #155747;
  --accent: #d66f3f;
  --shadow: 0 18px 48px rgba(32, 36, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 247, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  gap: 24px;
}

.logo {
  font-size: 20px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  align-items: center;
  width: min(1120px, calc(100% - 40px));
  min-height: calc(100vh - 68px);
  margin: 0 auto;
  padding: 56px 0 72px;
  gap: 56px;
}

.hero-content {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 22px;
  font-size: 66px;
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: 34px;
  line-height: 1.2;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.3;
}

.hero-text {
  max-width: 600px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 8px;
  background: var(--brand);
  color: #ffffff;
  font-weight: 700;
}

.button:hover {
  background: var(--brand-dark);
}

.hero-image {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-image img {
  width: 100%;
  height: min(560px, 65vh);
  object-fit: cover;
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 78px 0;
}

.section-muted {
  width: 100%;
  background: var(--surface-muted);
}

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

.section-heading {
  max-width: 680px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin-bottom: 0;
}

.card-grid,
.timeline,
.note-list {
  display: grid;
  gap: 18px;
}

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

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

.card,
.note-card,
.timeline-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

.card p,
.note-card p,
.timeline-item p {
  color: var(--muted);
}

.card-number {
  display: inline-block;
  margin-bottom: 22px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
}

.step,
.note-date {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 800;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 20px;
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .navbar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    min-height: 92px;
    gap: 8px;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 42px;
    gap: 34px;
  }

  h1 {
    font-size: 48px;
  }

  .card-grid,
  .timeline,
  .note-list {
    grid-template-columns: 1fr;
  }

  .hero-image img {
    height: 320px;
  }
}

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

  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 28px;
  }

  .section {
    padding: 58px 0;
  }

  .card,
  .note-card,
  .timeline-item {
    padding: 20px;
  }
}