:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e0e3ea;
  --text-main: #222;
  --text-sub: #666;
  --accent: #1e6b67;
  --accent-soft: #e3f3f2;
  --muted: #999;
  --maxw: 1180px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Noto Sans", "Microsoft YaHei", sans-serif;
}

body {
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.8;
}

html {
  scroll-behavior: smooth;
}

header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

nav {
  max-width: var(--maxw);
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
}

nav .logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 18px;
}

nav a {
  text-decoration: none;
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14px;
  transition: all 0.2s ease;
}

nav a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

main {
  padding: 30px 12px 60px;
}

section {
  max-width: var(--maxw);
  margin: 0 auto 30px auto;
  background: var(--card);
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 26px 24px 30px;
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

section:nth-child(1) { animation-delay: 0.1s; }
section:nth-child(2) { animation-delay: 0.2s; }
section:nth-child(3) { animation-delay: 0.3s; }

h1, h2, h3 {
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 16px;
}

h1 {
  font-size: 24px;
}

h2 {
  font-size: 20px;
  margin-top: 6px;
}

h3 {
  font-size: 16px;
}

p {
  margin-bottom: 12px;
  color: var(--text-main);
  font-size: 14px;
}

.muted {
  color: var(--text-sub);
  font-size: 13px;
}

ul, ol {
  margin-left: 22px;
  margin-bottom: 12px;
}

li {
  margin-bottom: 6px;
  font-size: 14px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.btn {
  display: inline-block;
  text-decoration: none;
  cursor: pointer;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 18px rgba(30, 107, 103, 0.24);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(30, 107, 103, 0.32);
}

.btn-outline {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent-soft);
}

.hero {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
}

.hero-text {
  flex: 1;
  min-width: 260px;
}

.hero-tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 10px;
}

.hero-sub {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 4px;
}

.hero-thumb {
  flex-shrink: 0;
}

.thumb {
  width: 360px;
  height: 220px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #dde4ec;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.chip-title {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  margin-bottom: 10px;
}

.two-col {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.two-col .col {
  flex: 1;
  min-width: 260px;
}

.list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px 20px;
  margin-top: 6px;
}

.list-grid-item {
  padding: 10px 12px;
  border-radius: 10px;
  background: #f7f9fb;
  border: 1px dashed #dde2ea;
  font-size: 13px;
  color: var(--text-sub);
  transition: all 0.2s ease;
}

.list-grid-item:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

footer {
  max-width: var(--maxw);
  margin: 10px auto 30px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 768px) {
  nav ul {
    gap: 8px;
    font-size: 12px;
  }
  
  nav a {
    padding: 4px 6px;
    font-size: 12px;
  }
  
  section {
    padding: 20px 16px 22px;
  }
  
  h1 {
    font-size: 20px;
  }
  
  .thumb {
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
  }
  
  .hero {
    text-align: left;
  }
}