/* ============================================================
   友衡分享 · 站点样式（自托管，无外部依赖 / 无 CDN / 系统字体栈）
   ------------------------------------------------------------
   合规：不引用任何第三方字体、图标、脚本；仅系统字体栈。
   用途：前台纯静态只读展示，全站不含任何表单/输入控件。
   主题：墨蓝主色 + 青色强调 + 浅灰底白卡 + 深色终端风代码块。
============================================================ */
:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #1d2b3a;
  --muted: #5a6b7d;
  --accent: #0b7285;
  --accent-deep: #075a6a;
  --accent-soft: #e3f2f5;
  --border: #e2e8f0;
  --code-bg: #10222c;
  --code-ink: #d7e8ee;
  --mark: #b6e3ea;
  --radius: 14px;
  --shadow: 0 6px 22px rgba(16, 42, 67, .07);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.75 -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 480px at 85% -180px, #dbeef3 0%, rgba(219,238,243,0) 70%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-deep); text-decoration: underline; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.read { max-width: 760px; margin: 0 auto; padding: 0 20px; }
section { padding: 56px 0 8px; }
h2.sec-title {
  font-size: 24px; margin: 0 0 6px; letter-spacing: .5px;
  display: flex; align-items: center; gap: 10px;
}
h2.sec-title::before {
  content: ""; width: 6px; height: 22px; border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
}
.sec-sub { color: var(--muted); margin: 0 0 26px; font-size: 14.5px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
}

/* SECTION: header & nav */
header.site-head {
  position: sticky; top: 0; z-index: 20;
  background: rgba(244, 246, 249, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.head-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand a { color: inherit; }
.brand a:hover { text-decoration: none; }
.brand-mark {
  width: 42px; height: 42px; flex: none; border-radius: 11px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  color: #fff; display: grid; place-items: center;
  font-weight: 700; font-size: 18px; font-family: Consolas, "Courier New", monospace;
  box-shadow: 0 4px 12px rgba(11,114,133,.28);
}
.brand-name { font-size: 19px; font-weight: 700; line-height: 1.2; }
.brand-tag { font-size: 12.5px; color: var(--muted); }
nav.site-nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
nav.site-nav::-webkit-scrollbar { display: none; }
nav.site-nav a {
  flex: none; padding: 8px 14px; border-radius: 999px;
  font-size: 14.5px; color: var(--muted); white-space: nowrap;
}
nav.site-nav a:hover { color: var(--accent-deep); background: var(--accent-soft); text-decoration: none; }
nav.site-nav a.active { color: #fff; background: var(--accent); }

/* SECTION: hero */
.hero { padding: 52px 0 8px; }
.hero-card {
  position: relative; overflow: hidden; border-radius: 18px;
  background: linear-gradient(135deg, #0d3d4a 0%, #0b7285 58%, #189aa8 100%);
  color: #eaf6f8; padding: 40px 40px 36px; box-shadow: var(--shadow);
}
.hero-card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(520px 200px at 90% -60px, rgba(255,255,255,.18), transparent 70%),
    repeating-linear-gradient(90deg, rgba(255,255,255,.05) 0 1px, transparent 1px 64px);
}
.hero h1 { margin: 0 0 12px; font-size: 32px; letter-spacing: 1px; position: relative; z-index: 1; }
.hero p.lead { margin: 0; max-width: 640px; font-size: 15.5px; line-height: 1.9; opacity: .94; position: relative; z-index: 1; }
.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; position: relative; z-index: 1; }
.badge {
  font-size: 13px; padding: 5px 13px; border-radius: 999px;
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.28);
}

/* SECTION: generic prose (info pages) */
.prose { padding: 26px 30px; }
.prose h3 { margin: 20px 0 8px; font-size: 16.5px; color: var(--accent-deep); }
.prose h3:first-child { margin-top: 0; }
.prose p { margin: 0 0 10px; color: #33475c; font-size: 15px; }
.prose ul, .prose ol { margin: 0 0 12px; padding-left: 22px; color: #33475c; font-size: 15px; }
.prose li { margin-bottom: 6px; }
.prose em { font-style: normal; font-weight: 700; color: var(--accent-deep); background: linear-gradient(180deg, transparent 62%, var(--mark) 62%); }

/* SECTION: article list (home) */
.tag {
  display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-deep); margin: 0 6px 6px 0;
}
.tag.orig { background: #e6f4ea; color: #1c7a3d; }
.tag.repost { background: #fdf3e3; color: #9a6212; }
.article { margin-bottom: 20px; overflow: hidden; }
.article-head { padding: 24px 28px 22px; }
.article-head h3 { margin: 0 0 8px; font-size: 19px; line-height: 1.5; }
.article-head h3 a { color: var(--ink); }
.article-head h3 a:hover { color: var(--accent-deep); text-decoration: none; }
.article-head h3 .idx { color: var(--accent); font-family: Consolas, "Courier New", monospace; margin-right: 8px; }
.article-meta { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.article-sum { margin: 0 0 10px; font-size: 14.5px; color: #40546a; }
.more-link { font-size: 14px; font-weight: 600; }
.card.hoverable { transition: transform .12s ease, box-shadow .12s ease; }
.card.hoverable:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(16, 42, 67, .12); }

/* SECTION: article detail */
.breadcrumb { font-size: 13px; color: var(--muted); margin: 0 0 14px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent-deep); }
.breadcrumb .sep { margin: 0 6px; color: #b6c2d0; }
.post { padding: 28px 30px 30px; }
.post-title { font-size: 26px; line-height: 1.4; margin: 6px 0 10px; }
.post-meta { font-size: 13px; color: var(--muted); padding-bottom: 16px; border-bottom: 1px solid var(--border); margin-bottom: 22px; }
.post-meta .dot { margin: 0 6px; color: #b6c2d0; }
.post-body { font-size: 16px; color: #2c3e50; }
.post-body h4 { margin: 24px 0 10px; font-size: 18px; color: var(--accent-deep); }
.post-body h4:first-child { margin-top: 0; }
.post-body p { margin: 0 0 13px; }
.post-body ul, .post-body ol { margin: 0 0 14px; padding-left: 24px; }
.post-body li { margin-bottom: 6px; }
.post-body em { color: var(--muted); font-style: normal; background: linear-gradient(180deg, transparent 62%, var(--mark) 62%); }
.post-body blockquote { margin: 0 0 14px; padding: 10px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; color: #33475c; }
.post-foot { margin-top: 26px; padding-top: 18px; border-top: 1px dashed var(--border); }
.post-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 22px; font-size: 14.5px; }
.post-nav a { color: var(--accent-deep); }
.post-nav .prev { margin-right: auto; }
.post-nav .next { margin-left: auto; }
.post-nav a:hover { text-decoration: underline; }
.notice {
  font-size: 13.5px; color: #33475c; background: var(--accent-soft);
  border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0;
  padding: 12px 16px; margin: 0 0 18px;
}
.notice.warn { color: #9a6212; background: #fdf6e8; border-left-color: #d9a441; }

/* SECTION: code blocks */
code.inline {
  font-family: "Cascadia Code", Consolas, "Courier New", monospace; font-size: 13.5px;
  background: #eef3f6; color: #0b5566; padding: 1px 6px; border-radius: 5px;
}
pre.code {
  background: var(--code-bg); color: var(--code-ink);
  font-family: "Cascadia Code", Consolas, "Courier New", monospace; font-size: 13px; line-height: 1.7;
  padding: 16px 18px; border-radius: 10px; overflow-x: auto; margin: 0 0 16px;
  border: 1px solid #1c3a48;
}
pre.code code { font-family: inherit; white-space: pre; }
pre.code .cm { color: #7fa6b4; }   /* 注释 */
pre.code .kw { color: #8fd0e6; }   /* 关键字（手工标注，可选） */
.lang-tag { display: inline-block; font-size: 11px; color: #7fa6b4; font-family: Consolas, monospace; letter-spacing: 1px; margin-bottom: 6px; }

/* SECTION: contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-card { padding: 26px 28px; }
.contact-card h3 { margin: 0 0 10px; font-size: 17.5px; color: var(--accent-deep); }
.contact-card p { margin: 0 0 10px; font-size: 14.5px; color: #33475c; }
.mail-line { font-size: 16px; margin: 14px 0 6px; }
.mail-line a { font-family: Consolas, "Courier New", monospace; border-bottom: 1px dashed var(--accent); }
.mail-line a:hover { text-decoration: none; }
.note {
  font-size: 13px; color: var(--muted); background: var(--accent-soft);
  border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0;
  padding: 10px 14px; margin-top: 14px;
}

/* SECTION: disclaimer */
.disc { padding: 24px 28px; }
.disc ol { margin: 0; padding-left: 20px; font-size: 14.5px; color: #33475c; }
.disc li { margin-bottom: 8px; }

/* SECTION: 关于本站 - 站点信息卡（dl/dt/dd，纯展示，无输入） */
.fact-card { padding: 22px 26px; display: grid; grid-template-columns: auto 1fr; gap: 10px 18px; align-items: baseline; }
.fact-card dt { font-size: 13.5px; color: var(--muted); white-space: nowrap; }
.fact-card dd { margin: 0; font-size: 14.5px; color: var(--ink); font-weight: 600; }

/* SECTION: footer */
footer.site-foot { margin-top: 60px; border-top: 1px solid var(--border); background: #eef2f6; }
.filing { text-align: center; padding: 26px 20px 6px; font-size: 13.5px; color: var(--muted); }
.filing .rec { margin: 4px 0; }
.filing a { color: var(--accent-deep); }
.shield { display: inline-block; vertical-align: -2px; margin-right: 4px; }
.foot-tip { text-align: center; font-size: 12.5px; color: #8595a7; padding: 8px 20px 26px; }
.site-info { text-align: center; font-size: 12.5px; color: #8595a7; padding: 0 20px 18px; }

/* SECTION: 404 */
.notfound { text-align: center; padding: 90px 20px; }
.notfound .big { font-size: 72px; font-weight: 800; color: var(--accent); font-family: Consolas, monospace; }
.notfound p { color: var(--muted); margin: 10px 0 22px; }

/* SECTION: responsive */
@media (max-width: 820px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .fact-card { grid-template-columns: 1fr; gap: 2px; }
  .fact-card dd { margin-bottom: 10px; }
  .hero-card { padding: 28px 22px; }
  .hero h1 { font-size: 25px; }
  .head-inner { flex-direction: column; align-items: flex-start; gap: 8px; padding: 12px 0; }
  .brand-tag { display: none; }
  section { padding-top: 42px; }
  .article-head, .post, .about-main, .contact-card, .disc, .prose { padding-left: 20px; padding-right: 20px; }
  .post-title { font-size: 22px; }
}