:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --text: #1f2328;
  --text-muted: #57606a;
  --accent: #1d9e75;
  --accent-dark: #0f6e56;
  --border: #e4e8ec;
  --radius: 12px;
  --maxw: 880px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 600; font-size: 17px; color: var(--text); }
.nav-links { list-style: none; display: flex; gap: 22px; margin: 0; padding: 0; }
.nav-links a { color: var(--text-muted); font-size: 15px; }
.nav-links a:hover { color: var(--accent-dark); text-decoration: none; }

/* Hero */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 90px 20px 70px;
  text-align: center;
}
.hero-eyebrow { color: var(--accent-dark); font-weight: 600; margin: 0 0 8px; }
.hero-title { font-size: 48px; margin: 0 0 16px; letter-spacing: 1px; }
.hero-sub { font-size: 18px; color: var(--text-muted); margin: 0 auto 28px; max-width: 540px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  transition: transform .1s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-dark); }

/* Sections */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 20px;
  border-top: 1px solid var(--border);
}
.section-title { font-size: 26px; margin: 0 0 18px; }
.section-text { color: var(--text-muted); margin: 0 0 16px; }

.tag-list { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 0; }
.tag-list li {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 14px;
  color: var(--text-muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--bg-soft);
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0 0 14px; color: var(--text-muted); font-size: 14px; }
.card-link { font-size: 14px; font-weight: 500; }

.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--border);
}
.post-date { color: var(--text-muted); font-size: 13px; white-space: nowrap; }

.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { padding: 6px 0; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 30px 20px;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
  .hero-title { font-size: 36px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 14px; }
}