:root {
  color-scheme: light;
  --ink: #1f2523;
  --muted: #68746f;
  --line: #dde5e1;
  --paper: #f5f7f4;
  --card: #ffffff;
  --accent: #176b5c;
  --accent-strong: #0f4f44;
  --accent-soft: #e7f2ee;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 max(24px, calc((100vw - 1040px) / 2));
  border-bottom: 1px solid rgba(231, 233, 238, 0.9);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
}

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

.nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.nav a:hover,
.section-heading a:hover {
  color: var(--accent);
}

.hero {
  background:
    linear-gradient(135deg, rgba(23, 107, 92, 0.12), rgba(255, 255, 255, 0) 42%),
    #ffffff;
  border-bottom: 1px solid var(--line);
}

.hero-inner,
.page {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
}

.hero-inner {
  padding: 86px 0 72px;
}

.hero h1,
.page-title h1,
.article-header h1 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1.16;
}

.hero h1 {
  font-size: clamp(44px, 7vw, 82px);
}

.hero p,
.page-title p,
.article-header p {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 760;
}

.button:hover {
  background: var(--accent-strong);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page {
  padding: 42px 0 72px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
}

.section-heading a {
  color: var(--muted);
  font-size: 14px;
}

.post-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.feature-card {
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
}

.feature-card a {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  padding: 24px;
}

.feature-label {
  color: var(--accent);
  font-size: 13px;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.feature-card h2 {
  margin: 24px 0 10px;
  font-size: 28px;
  line-height: 1.2;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
}

.post-card {
  min-height: 180px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
}

.post-card a {
  display: block;
  height: 100%;
  padding: 22px;
}

.post-card time {
  color: var(--muted);
  font-size: 13px;
}

.post-card h2 {
  margin: 12px 0 10px;
  font-size: 22px;
  line-height: 1.3;
}

.post-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.article {
  max-width: 860px;
}

.article-header {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.article-header h1 {
  font-size: clamp(34px, 5vw, 56px);
}

.article-body {
  padding-top: 28px;
}

.article-body img {
  max-width: 100%;
  height: auto;
}

@media (max-width: 680px) {
  .site-header {
    padding: 0 20px;
  }

  .hero-inner,
  .page {
    width: min(100% - 28px, 1040px);
  }

  .hero-inner {
    padding: 52px 0 44px;
  }
}