/* 乐鱼手札 - 个人学习笔记站点样式 */
:root {
  --paper: #faf7f0;
  --paper-soft: #f3ede1;
  --ink: #2c2a26;
  --ink-soft: #6b665c;
  --line: #e3dccd;
  --accent: #1f7a7a;
  --accent-soft: #2f9b9b;
  --shadow: rgba(44, 42, 38, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  font-size: 17px;
}

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

.container {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部导航 */
.nav {
  border-bottom: 1px solid var(--line);
  background: rgba(250, 247, 240, 0.9);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 2px;
}
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--ink-soft);
  font-size: 16px;
  letter-spacing: 1px;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); text-decoration: none; }

/* 首屏 */
.hero {
  text-align: center;
  padding: 88px 24px 64px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 20% 20%, rgba(31,122,122,0.06), transparent 40%),
    radial-gradient(circle at 80% 60%, rgba(31,122,122,0.05), transparent 40%);
}
.hero h1 {
  font-size: 44px;
  letter-spacing: 6px;
  margin-bottom: 18px;
}
.hero p {
  color: var(--ink-soft);
  font-size: 18px;
  max-width: 560px;
  margin: 0 auto 8px;
}
.hero .seal {
  display: inline-block;
  margin-top: 18px;
  padding: 6px 18px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 3px;
}

/* 区块标题 */
.section { padding: 56px 0; }
.section-title {
  font-size: 24px;
  letter-spacing: 3px;
  margin-bottom: 28px;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
}

/* 分类卡片 */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px var(--shadow);
}
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--ink-soft); font-size: 15px; }

/* 笔记列表 */
.note-list { list-style: none; }
.note-list li {
  border-bottom: 1px dashed var(--line);
  padding: 20px 0;
}
.note-list .meta {
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 1px;
}
.note-list h3 { font-size: 20px; margin: 6px 0; }
.note-list h3 a { color: var(--ink); }
.note-list h3 a:hover { color: var(--accent); text-decoration: none; }
.note-list .excerpt { color: var(--ink-soft); font-size: 15px; }

/* 文章页 */
.article { padding: 48px 0 24px; }
.article .meta {
  color: var(--ink-soft);
  font-size: 14px;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.article h1 { font-size: 34px; letter-spacing: 2px; margin-bottom: 24px; }
.article h2 {
  font-size: 23px;
  margin: 36px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
.article p { margin-bottom: 18px; }
.article pre {
  background: #2c2a26;
  color: #f3ede1;
  padding: 18px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 20px;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.article code {
  background: var(--paper-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 15px;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.article blockquote {
  border-left: 4px solid var(--accent);
  background: var(--paper-soft);
  padding: 12px 20px;
  margin: 0 0 20px;
  color: var(--ink-soft);
  border-radius: 0 6px 6px 0;
}

/* 页脚 */
.footer {
  border-top: 1px solid var(--line);
  background: var(--paper-soft);
  padding: 36px 0;
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
}
.footer a { color: var(--ink-soft); }
.footer .beian { margin-top: 8px; letter-spacing: 1px; }

/* 响应式 */
@media (max-width: 600px) {
  .hero h1 { font-size: 34px; letter-spacing: 3px; }
  .nav-links { gap: 18px; }
  body { font-size: 16px; }
}