:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --text: #1f2329;
  --text-soft: #5b6168;
  --border: #e6e8eb;
  --accent: #2b6cb0;
  --accent-soft: #e8f1fb;
  --sidebar-w: 250px;
  --topbar-h: 56px;
  --maxw: 820px;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.topbar .brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}
.topbar .brand:hover { text-decoration: none; }
.topbar .sub { color: var(--text-soft); font-size: 13px; }

/* ---------- 布局 ---------- */
.layout {
  display: flex;
  align-items: flex-start;
  max-width: 1200px;
  margin: 0 auto;
}

/* ---------- 侧边栏 ---------- */
.sidebar {
  position: sticky;
  top: var(--topbar-h);
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 24px 12px 40px 24px;
  border-right: 1px solid var(--border);
}
.sidebar .group { margin-bottom: 22px; }
.sidebar .group-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-soft);
  text-transform: uppercase;
  margin: 0 0 8px 8px;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a {
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
}
.sidebar li a:hover { background: var(--bg-soft); text-decoration: none; }
.sidebar li a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* ---------- 正文 ---------- */
.content {
  flex: 1 1 auto;
  min-width: 0;
  padding: 40px 32px 80px;
}
.content article { max-width: var(--maxw); margin: 0 auto; }

.content h1 { font-size: 30px; line-height: 1.3; margin: 0 0 8px; }
.content h2 {
  font-size: 22px;
  margin: 38px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.content h3 { font-size: 18px; margin: 26px 0 8px; }
.content p { margin: 14px 0; }
.content .meta {
  color: var(--text-soft);
  font-size: 13px;
  margin-bottom: 28px;
}
.content ul, .content ol { padding-left: 22px; }
.content li { margin: 6px 0; }

.content code {
  background: var(--bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}
.content pre {
  background: #1e2430;
  color: #e6e6e6;
  padding: 16px 18px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}
.content pre code { background: none; padding: 0; color: inherit; }

.content blockquote {
  margin: 16px 0;
  padding: 4px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--text-soft);
  border-radius: 0 6px 6px 0;
}

/* ---------- 首页卡片 ---------- */
.section-title {
  max-width: 1000px;
  margin: 38px auto 16px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
.hero { max-width: var(--maxw); margin: 0 auto 36px; }
.hero h1 { font-size: 34px; margin-bottom: 10px; }
.hero p { color: var(--text-soft); font-size: 16px; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}
.card {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(43, 108, 176, 0.12);
  text-decoration: none;
}
.card .c-title { font-weight: 700; color: var(--text); margin-bottom: 6px; }
.card .c-desc { font-size: 13px; color: var(--text-soft); }

/* ---------- 站点初衷 ---------- */
.intention {
  max-width: 1000px;
  margin: 0 auto 40px;
  padding: 28px 30px;
  background: var(--accent-soft);
  border: 1px solid #d4e6f7;
  border-radius: 12px;
}
.intention .label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: #fff;
  border: 1px solid #cfe0f2;
  padding: 3px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.intention .sutra {
  font-size: 19px;
  line-height: 1.95;
  color: #243b53;
  margin: 0 0 18px;
  font-weight: 500;
}
.intention .sutra .em { color: var(--accent); font-weight: 700; }
.intention .en {
  font-size: 16px;
  font-style: italic;
  color: var(--text-soft);
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed #cfe0f2;
}
.intention .en .mark { color: var(--accent); font-weight: 700; font-style: normal; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .layout { flex-direction: column; }
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 16px 16px;
  }
  .content { padding: 28px 18px 60px; }
}

/* ---------- 页脚备案号 ---------- */
.site-footer {
  max-width: var(--maxw);
  margin: 48px auto 0;
  padding: 20px 32px 36px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.9;
}
.site-footer a { color: var(--text-soft); }
.site-footer .copyright { margin: 4px 0 0; }