:root {
  --bg: #f6f9fd;
  --panel: #ffffff;
  --line: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --accent-light: #dbeafe;
  --sky: #0ea5e9;
  --radius: 14px;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(1000px 400px at 85% -5%, rgba(14, 165, 233, 0.08), transparent 55%),
    radial-gradient(800px 500px at 10% 110%, rgba(37, 99, 235, 0.06), transparent 60%);
}

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

.container { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶栏 ===== */
.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 18px;
  padding: 14px 24px; max-width: 1040px; margin: 0 auto;
}
.logo { height: 42px; width: 42px; }
.brand { display: flex; flex-direction: column; }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: 1px; color: var(--text); }
.brand-sub { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 2px; }
.nav { margin-left: auto; display: flex; gap: 24px; font-size: 14px; }
.nav a { color: var(--muted); transition: color .15s ease; }
.nav a.active, .nav a:hover { color: var(--accent); }

/* ===== 首页 ===== */
.hero { padding: 96px 24px 60px; }
.hero-kicker {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  letter-spacing: 3px; margin-bottom: 16px;
}
.hero h1 {
  font-size: 46px; line-height: 1.28; margin: 0 0 20px; font-weight: 800;
  color: #0f172a; letter-spacing: -0.5px;
}
.hero h1 .hl { color: var(--accent); }
.hero p.lead { max-width: 640px; color: var(--muted); font-size: 16px; margin: 0 0 32px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-chip {
  font-family: var(--mono); font-size: 12px; color: #475569;
  background: var(--accent-soft); border: 1px solid var(--accent-light);
  border-radius: 999px; padding: 5px 14px;
}

.section-title {
  display: flex; align-items: center; gap: 10px; margin: 68px 0 24px;
  font-size: 22px; font-weight: 700; color: #0f172a;
}
.section-title::before {
  content: ""; width: 4px; height: 18px; background: var(--accent); display: inline-block; border-radius: 2px;
}

/* ===== 卡片网格 ===== */
.record-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  padding-bottom: 20px;
}
.record-card {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
a.record-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.08);
}
.record-card h3 { margin: 0 0 8px; font-size: 16px; color: #0f172a; }
.record-card p { margin: 0 0 14px; color: var(--muted); font-size: 13px; }
.card-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font-family: var(--mono); font-size: 11px; color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 2px 10px; background: #f8fafc;
}
.tag-cat { color: var(--accent); border-color: var(--accent-light); background: var(--accent-soft); }

/* ===== 记录正文 ===== */
.article { padding: 60px 24px 40px; max-width: 760px; margin: 0 auto; }
.article h1 { font-size: 30px; line-height: 1.35; margin: 10px 0 8px; color: #0f172a; }
.article-meta { color: var(--muted); font-family: var(--mono); font-size: 13px; margin-bottom: 32px; }
.article-body h2 {
  font-size: 19px; margin: 36px 0 12px; padding-left: 12px; border-left: 3px solid var(--accent); color: #0f172a;
}
.article-body p { color: #334155; margin: 12px 0; }
.article-body ul, .article-body ol { color: #334155; padding-left: 22px; }
.article-body li { margin: 6px 0; }
.article-body code {
  font-family: var(--mono); font-size: 0.9em; background: var(--accent-soft); padding: 2px 6px; border-radius: 4px;
  color: var(--accent);
}
.article-body pre {
  background: #0f172a; border: none; border-radius: var(--radius);
  padding: 18px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.65;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
}
.article-body pre code { background: none; padding: 0; color: #93c5fd; }

/* ===== 页脚 ===== */
.site-footer {
  margin-top: 76px; border-top: 1px solid var(--line);
  background: #ffffff;
  padding: 30px 24px 36px; text-align: center; color: var(--muted); font-size: 13px;
}
.site-footer .line { margin: 4px 0; }
.beian-link { color: var(--muted); font-family: var(--mono); font-size: 13px; transition: color .15s ease; }
.beian-link:hover { color: var(--accent); }

/* ===== 404 ===== */
.not-found { padding: 80px 24px; text-align: center; color: var(--muted); }

@media (max-width: 640px) {
  .hero { padding: 60px 20px 40px; }
  .hero h1 { font-size: 30px; }
  .nav { gap: 14px; }
}