/* pstoh.github.io —— 全站样式（无外部依赖，单文件） */
:root {
  --bg: #f7f8fa;
  --bg-card: #ffffff;
  --bg-soft: #eef2f7;
  --fg: #1a2029;
  --fg-soft: #5b6675;
  --fg-mute: #8a94a3;
  --line: #e3e8ef;
  --accent: #2563eb;
  --accent-soft: #e8efff;
  --accent-2: #0d9488;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px -12px rgba(16, 24, 40, .14);
  --shadow-hover: 0 2px 4px rgba(16, 24, 40, .06), 0 18px 36px -16px rgba(16, 24, 40, .24);
  --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, Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --bg-card: #161b22;
    --bg-soft: #1c222b;
    --fg: #e6edf3;
    --fg-soft: #a9b4c0;
    --fg-mute: #7d8895;
    --line: #262d38;
    --accent: #6ea8fe;
    --accent-soft: #1b2740;
    --accent-2: #4fd1c5;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 28px -14px rgba(0, 0, 0, .7);
    --shadow-hover: 0 2px 6px rgba(0, 0, 0, .5), 0 20px 40px -18px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.wrap { width: 100%; max-width: 780px; margin: 0 auto; padding: 0 20px; }
.wrap-wide { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.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);
}
.site-header .inner {
  display: flex; align-items: center; gap: 20px;
  height: 60px; max-width: 1040px; margin: 0 auto; padding: 0 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--fg); font-size: 16px; }
.brand:hover { text-decoration: none; }
.brand .dot {
  width: 26px; height: 26px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; color: #fff; font-size: 14px; font-weight: 800;
}
.site-nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: var(--fg-soft); padding: 6px 12px; border-radius: 8px; font-size: 14px; font-weight: 500;
}
.site-nav a:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

/* ---------- 首屏 ---------- */
.hero { padding: 56px 0 28px; }
.hero h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.25; margin: 0 0 14px; letter-spacing: -.02em; }
.hero .lede { font-size: 17px; color: var(--fg-soft); margin: 0 0 22px; max-width: 62ch; }
.hero .tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 13px; color: var(--fg-soft); background: var(--bg-card);
  border: 1px solid var(--line); padding: 4px 11px; border-radius: 999px;
}

/* ---------- 文章卡片 ---------- */
.section-title { display: flex; align-items: baseline; gap: 12px; margin: 40px 0 18px; }
.section-title h2 { font-size: 19px; margin: 0; letter-spacing: -.01em; }
.section-title .hint { font-size: 13px; color: var(--fg-mute); }

.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); padding: 0 0 24px; }
.card {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 20px 18px; 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) 40%, var(--line)); }
.card h3 { margin: 0; font-size: 17px; line-height: 1.5; }
.card h3 a { color: var(--fg); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card p { margin: 0; color: var(--fg-soft); font-size: 14.5px; }
.card .meta { margin-top: auto; display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--fg-mute); }
.card .meta .k { color: var(--accent); background: var(--accent-soft); padding: 2px 9px; border-radius: 999px; font-weight: 600; }

/* ---------- 文章正文 ---------- */
.breadcrumb { font-size: 13px; color: var(--fg-mute); padding: 24px 0 0; }
.breadcrumb a { color: var(--fg-mute); }
.breadcrumb span { margin: 0 6px; }
article.post { padding-bottom: 40px; }
article.post > header { padding: 18px 0 8px; border-bottom: 1px solid var(--line); margin-bottom: 26px; }
article.post h1 { font-size: clamp(25px, 4.4vw, 33px); line-height: 1.3; margin: 0 0 12px; letter-spacing: -.02em; }
.post-meta { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; color: var(--fg-mute); }
.post-body { font-size: 16.5px; }
.post-body h2 {
  font-size: 21px; margin: 38px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--line); letter-spacing: -.01em;
}
.post-body h3 { font-size: 17.5px; margin: 26px 0 10px; }
.post-body p { margin: 0 0 16px; }
.post-body ul, .post-body ol { margin: 0 0 16px; padding-left: 22px; }
.post-body li { margin: 6px 0; }
.post-body strong { font-weight: 650; }
.post-body blockquote {
  margin: 20px 0; padding: 12px 18px; border-left: 3px solid var(--accent);
  background: var(--bg-soft); border-radius: 0 10px 10px 0; color: var(--fg-soft);
}
.post-body blockquote p:last-child { margin-bottom: 0; }
.post-body code {
  font-family: var(--mono); font-size: .88em; background: var(--bg-soft);
  padding: 2px 6px; border-radius: 6px; border: 1px solid var(--line);
}
.post-body pre {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; overflow-x: auto; margin: 0 0 18px; line-height: 1.6;
}
.post-body pre code { background: none; border: none; padding: 0; font-size: 13.5px; }
.post-body table { width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: 14.5px; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
.post-body th { background: var(--bg-soft); font-weight: 650; }
.post-body img { border-radius: 12px; border: 1px solid var(--line); }

.note {
  margin: 24px 0; padding: 16px 18px; border-radius: 12px;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line));
  font-size: 15px;
}
.note p:last-child { margin-bottom: 0; }
.note strong { color: var(--accent); }

.post-footer { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--line); }
.related { margin-top: 8px; }
.related h2 { font-size: 16px; margin: 0 0 12px; color: var(--fg-soft); font-weight: 600; }
.related ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.related li a { display: block; padding: 11px 14px; background: var(--bg-card); border: 1px solid var(--line); border-radius: 10px; color: var(--fg); font-size: 15px; }
.related li a:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); text-decoration: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 48px; border-top: 1px solid var(--line); padding: 28px 0 40px;
  color: var(--fg-mute); font-size: 13.5px; background: var(--bg-card);
}
.site-footer .cols { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; }
.site-footer a { color: var(--fg-soft); }
.site-footer .links { display: flex; flex-wrap: wrap; gap: 16px; }
.site-footer .disclaimer { margin-top: 18px; color: var(--fg-mute); font-size: 12.5px; line-height: 1.7; }

/* ---------- 关于页 ---------- */
.profile { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; margin: 8px 0 26px; }
.profile .avatar {
  width: 72px; height: 72px; border-radius: 20px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; color: #fff; font-size: 26px; font-weight: 800;
}
.profile .who h1 { margin: 0 0 4px; font-size: 26px; }
.profile .who p { margin: 0; color: var(--fg-soft); font-size: 15px; }

/* ---------- 移动端 ---------- */
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .site-header .inner { height: 56px; gap: 10px; }
  .site-nav a { padding: 6px 9px; font-size: 13.5px; }
  .hero { padding: 34px 0 20px; }
  .cards { grid-template-columns: 1fr; }
  .post-body pre { padding: 13px 14px; font-size: 13px; }
  .post-body h2 { font-size: 19px; }
}
@media print {
  .site-header, .site-footer, .related { display: none; }
  body { background: #fff; }
}