/* ============================================================
   全站样式 —— 想改配色改最上面那组变量就行
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-card: #ffffff;
  --fg: #16181d;
  --fg-soft: #4b5563;
  --muted: #8b93a1;
  --line: #e6e8ec;
  --accent: #3355ff;
  --accent-soft: #eef1ff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 20, 30, .04), 0 8px 24px rgba(16, 20, 30, .05);
  --shadow-hover: 0 2px 4px rgba(16, 20, 30, .06), 0 14px 36px rgba(16, 20, 30, .10);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
          "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #16191f;
    --bg-card: #171a21;
    --fg: #e8eaee;
    --fg-soft: #b6bcc8;
    --muted: #7c8494;
    --line: #262a33;
    --accent: #7c93ff;
    --accent-soft: #1b2033;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    --shadow-hover: 0 2px 6px rgba(0, 0, 0, .35), 0 14px 36px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; }

.wrap {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 20px;
}

.center { text-align: center; }

/* ---------------- 顶栏 ---------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .2px;
}
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 13px; }

.nav { display: flex; gap: 4px; }
.nav a {
  color: var(--fg-soft);
  padding: 6px 12px;
  border-radius: 9px;
  font-size: 14.5px;
  transition: background .15s, color .15s;
}
.nav a:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.nav a.is-active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

/* ---------------- 首页大标题 ---------------- */

.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 44px;
  background:
    radial-gradient(900px 260px at 12% -30%, var(--accent-soft), transparent 70%);
}

.hero-title {
  margin: 0;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1.2;
  letter-spacing: -.5px;
}

.hero-tagline {
  margin: 14px 0 0;
  font-size: 17px;
  color: var(--fg-soft);
  max-width: 620px;
}

.hero-stats {
  margin: 22px 0 0;
  font-size: 13.5px;
  color: var(--muted);
}

/* ---------------- 文章卡片 ---------------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 22px;
  padding-bottom: 60px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
}

.card-cover { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg-soft); }
.card-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }

.card-body { padding: 20px 22px 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }

.card-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  color: var(--muted);
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
}
.badge:hover { text-decoration: none; }

.dot { color: var(--line); }

.card-title { margin: 0; font-size: 19px; line-height: 1.45; letter-spacing: -.2px; }
.card-title a { color: var(--fg); }
.card-title a:hover { color: var(--accent); text-decoration: none; }

.card-summary {
  margin: 0;
  color: var(--fg-soft);
  font-size: 14.5px;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------------- 列表页头部 ---------------- */

.page-head { padding: 52px 20px 26px; }
.page-head h1 { margin: 0; font-size: clamp(26px, 4vw, 34px); letter-spacing: -.4px; }
.page-sub { margin: 10px 0 0; color: var(--muted); font-size: 15px; }
.crumb { margin: 0 0 10px; font-size: 13.5px; }

.cat-list { list-style: none; margin: 0; padding: 0 0 60px; display: grid; gap: 12px; }
.cat-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--fg);
  font-weight: 600;
  box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.cat-list a:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
}
.cat-list em { font-style: normal; color: var(--muted); font-weight: 500; font-size: 14px; }

.empty { color: var(--muted); padding-bottom: 60px; }

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }

/* ---------------- 文章页 ---------------- */

.post { max-width: 740px; padding-top: 52px; padding-bottom: 40px; }

.post-head { margin-bottom: 34px; padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.post-title {
  margin: 14px 0 0;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1.3;
  letter-spacing: -.6px;
}

.prose { font-size: 16.5px; line-height: 1.85; color: var(--fg); }
.prose > *:first-child { margin-top: 0; }

.prose h2 {
  margin: 46px 0 16px;
  padding-left: 13px;
  border-left: 4px solid var(--accent);
  font-size: 23px;
  line-height: 1.4;
  letter-spacing: -.3px;
}
.prose h3 { margin: 34px 0 12px; font-size: 19px; }
.prose h4 { margin: 26px 0 10px; font-size: 17px; color: var(--fg-soft); }

.prose p { margin: 0 0 20px; }

.prose ul, .prose ol { margin: 0 0 20px; padding-left: 26px; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--muted); }

.prose a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.prose a:hover { text-decoration: none; border-bottom-color: var(--accent); }

.prose strong { font-weight: 700; }

.prose code {
  font-family: var(--mono);
  font-size: .89em;
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
}

.prose pre {
  margin: 0 0 22px;
  padding: 18px 20px;
  border-radius: 12px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  overflow-x: auto;
  line-height: 1.65;
}
.prose pre code {
  padding: 0;
  border: 0;
  background: none;
  font-size: 13.5px;
  white-space: pre;
}

.prose blockquote {
  margin: 0 0 22px;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--line);
  color: var(--fg-soft);
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose hr { margin: 38px 0; border: 0; border-top: 1px solid var(--line); }

.table-wrap { overflow-x: auto; margin: 0 0 22px; }

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.prose th, .prose td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.prose th { background: var(--bg-soft); font-weight: 600; font-size: 14px; }
.prose tbody tr:last-child td { border-bottom: 0; }

.prose img { border-radius: 12px; margin: 6px 0 22px; }

.post-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 34px 0 0; }
.tag {
  font-size: 13px;
  color: var(--muted);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 3px 11px;
  border-radius: 999px;
}

.post-foot {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
}

/* ---------------- 页脚 ---------------- */

.site-footer {
  margin-top: 40px;
  padding: 34px 0 46px;
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 14px;
}
.site-footer p { margin: 0 0 6px; }
.footer-sub { font-size: 13px; }

/* ---------------- 手机 ---------------- */

@media (max-width: 640px) {
  .hero { padding: 48px 0 40px; margin-bottom: 32px; }
  .grid { grid-template-columns: 1fr; gap: 18px; }
  .header-inner { height: 56px; }
  .brand-name { font-size: 16px; }
  .nav a { padding: 6px 9px; font-size: 14px; }
  .prose { font-size: 16px; }
  .prose h2 { font-size: 21px; margin-top: 38px; }
  .post { padding-top: 34px; }
}