/* ============================================================
   s9y 博客 — 瑞士国际主义风格（暗色）
   客观网格、单一强调色、单一字体系统。
   与 s3hq4y.github.io 设计语言保持一致：
   黑 / 白 / 一点红，Inter + IBM Plex Mono，直角。
   字体与配色集中在此处，便于整体换肤。
   ============================================================ */
:root {
  /* ---- 字体系统：只在这里换字体 ---- */
  --font-display: "Inter", "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-text: var(--font-display);
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font: var(--font-text);

  /* ---- 配色：黑、白、一点红 ---- */
  --bg: #0a0a0b;
  --bg-soft: #131316;
  --fg: #ffffff;
  --fg-dim: #b4b4ba;
  --fg-faint: #6d6d74;
  --line: rgba(255, 255, 255, 0.18);
  --line-soft: rgba(255, 255, 255, 0.08);
  --accent: #e4002b;
  --accent-2: #ff4d63;
  --card: #131316;
  --wrap: 820px;
  --ease: cubic-bezier(0.2, 0, 0, 1);
  color-scheme: dark;
}

* { 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);
  line-height: 1.55;
  font-size: clamp(15px, 1vw, 17px);
  letter-spacing: -0.004em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

/* 背景氛围 */
.noise {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
.glow {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(70% 50% at 82% -8%, rgba(228, 0, 43, 0.10), transparent 62%),
    radial-gradient(60% 44% at 8% 2%, rgba(228, 0, 43, 0.05), transparent 60%);
}
.site-header, main, .site-footer { position: relative; z-index: 2; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(10,10,11,.72); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 14px; }
.site-brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; letter-spacing: .01em; white-space: nowrap; }
.site-brand .dot { width: 10px; height: 10px; background: var(--accent); display: inline-block; }
.site-nav { display: flex; gap: 16px; font-size: 13px; color: var(--fg-dim); align-items: center; }
.site-nav a { transition: color .25s var(--ease); position: relative; }
.site-nav a:hover { color: var(--fg); }
.site-nav a.on { color: var(--fg); }
.site-nav a.on::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -6px; height: 1px; background: var(--accent);
}
/* intro（主页自我介绍 + 元信息网格） */
.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: end;
  padding: 56px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}
.intro-lead h1 {
  font-size: clamp(2rem, 6vw, 3rem);
  margin: 0 0 16px; letter-spacing: -.025em; line-height: 1.05; font-weight: 800;
}
.intro-text { max-width: 46ch; }
.intro-text p { margin: 0 0 6px; color: var(--fg-dim); }
.intro-text p:first-child { color: var(--fg); font-weight: 500; }
.intro-meta { display: flex; flex-direction: column; gap: 6px; align-items: flex-end; text-align: right; }
.intro-meta .count { color: var(--fg-faint); font-size: 12px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .08em; }

/* 章节标签：瑞士国际主义的编号/标签感 */
.section-label {
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  text-transform: uppercase; letter-spacing: .12em; color: var(--fg-faint);
  margin: 0 0 18px; padding-bottom: 10px; border-bottom: 1px solid var(--line-soft);
}
.section { padding: 36px 0 8px; scroll-margin-top: 72px; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.section-head .section-label { flex: 1 1 auto; margin-bottom: 0; }
.section-head { border-bottom: 1px solid var(--line-soft); margin-bottom: 18px; }

/* 标题搜索框 */
.search { display: flex; align-items: center; gap: 10px; }
.search-input {
  font-family: var(--font-mono); font-size: 13px;
  background: var(--bg-soft); color: var(--fg);
  border: 1px solid var(--line); padding: 7px 10px; min-width: 180px;
  transition: border-color .25s var(--ease);
}
.search-input::placeholder { color: var(--fg-faint); }
.search-input:focus { outline: none; border-color: var(--accent); }
.search-count { font-family: var(--font-mono); font-size: 12px; color: var(--fg-faint); }
.search-empty { color: var(--fg-faint); font-size: 14px; padding: 20px 0; }

/* 文章网格 —— 主页主布局（列宽自适应：窗口越大每行越多） */
.post-grid {
  --grid-min: 300px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--grid-min), 1fr));
  gap: 0;
  border-top: 1px solid var(--line-soft);
  border-left: 1px solid var(--line-soft);
}
.post-grid .post-card {
  margin: 0; padding: 0;
  border: 0;
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  transition: background .35s var(--ease);
}
.post-grid .post-card::before { display: none; }
.post-grid .post-card:hover { transform: none; background: var(--bg-soft); }

/* hero */
.hero { padding: 52px 0 24px; border-bottom: 1px solid var(--line-soft); margin-bottom: 8px; }
.hero h1 {
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  margin: 0 0 10px; letter-spacing: -.02em; line-height: 1.1; font-weight: 800;
}
.hero h1 .accent { color: var(--accent); }
.hero .lede { color: var(--fg-dim); margin: 0 0 8px; }
.hero .count { color: var(--fg-faint); font-size: 13px; font-family: var(--font-mono); margin: 0; }
.crumbs { font-size: 13px; color: var(--fg-dim); margin: 6px 0; font-family: var(--font-mono); }
.crumbs a { color: var(--fg-dim); }
.crumbs a:hover { color: var(--accent); }

/* post list（列表页：归档/标签/分类沿用纵向卡片） */
.post-list { display: flex; flex-direction: column; }
.post-card {
  position: relative;
  transition: background .35s var(--ease), transform .35s var(--ease);
}
.post-card-body { padding: 24px 22px; display: flex; flex-direction: column; gap: 12px; height: 100%; }
.post-card-cover { display: block; overflow: hidden; border-bottom: 1px solid var(--line-soft); }
.post-card-cover img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; transition: transform .5s var(--ease); }
.post-card:hover .post-card-cover img { transform: scale(1.03); }
.post-card h2 { font-size: 19px; margin: 0 0 8px; letter-spacing: -.01em; line-height: 1.3; transition: color .25s var(--ease); }
.post-card-summary { color: var(--fg-dim); margin: 0; font-size: 14.5px; line-height: 1.6; }
.post-card-link { display: block; }
.post-card-link:hover h2 { color: var(--accent); }
.post-card .pin {
  display: inline-block; vertical-align: middle; margin-right: 8px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: .04em;
  color: var(--accent); border: 1px solid var(--accent); padding: 1px 6px; line-height: 1.4;
}
.post-card .post-meta { margin-top: auto; }

/* 列表页（.post-list 内的卡片）恢复横向内边距与分隔线 */
.post-list .post-card { padding: 24px 20px 24px 22px; margin: 0 -20px; border-bottom: 1px solid var(--line-soft); }
.post-list .post-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--accent); transform: scaleY(0); transform-origin: top;
  transition: transform .35s var(--ease);
}
.post-list .post-card:hover { background: linear-gradient(180deg, rgba(228,0,43,.06), rgba(255,255,255,0)); transform: translateX(4px); }
.post-list .post-card:hover::before { transform: scaleY(1); }
.post-list .post-card-body { padding: 0; }
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 12.5px; color: var(--fg-faint); font-family: var(--font-mono); }
.post-meta .sep { opacity: .5; color: var(--accent); }
.cat { color: var(--fg-dim); border-bottom: 1px solid var(--line); }
.cat:hover { color: var(--accent); border-bottom-color: var(--accent); }
.tag { color: var(--fg-faint); }
.tag:hover { color: var(--accent); }

/* post */
.post { padding: 40px 0 20px; }
.post-header { margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--line-soft); }
.post-header h1 { font-size: clamp(1.6rem, 5vw, 2.1rem); margin: 0 0 14px; letter-spacing: -.02em; line-height: 1.25; font-weight: 800; }
.post-cover { margin: 20px 0 0; border: 1px solid var(--line-soft); overflow: hidden; }
.post-cover img { display: block; width: 100%; aspect-ratio: 21 / 9; object-fit: cover; }
.post-tags { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 10px; font-size: 13px; font-family: var(--font-mono); }
.toc {
  border: 1px solid var(--line); background: var(--card);
  padding: 16px 20px; margin: 0 0 28px; font-size: 14px;
}
.toc-title { margin: 0 0 8px; color: var(--fg-faint); font-size: 12px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .08em; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 4px 0; }
.toc li.d3 { padding-left: 16px; }
.toc a { color: var(--fg-dim); }
.toc a:hover { color: var(--accent); }

/* markdown body */
.markdown-body { font-family: var(--font); font-size: 16px; line-height: 1.85; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { letter-spacing: -.01em; scroll-margin-top: 72px; }
.markdown-body h2 { margin-top: 40px; padding-bottom: 6px; border-bottom: 1px solid var(--line-soft); }
.markdown-body h3 { margin-top: 28px; }
.markdown-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(228,0,43,.35); }
.markdown-body a:hover { border-bottom-color: var(--accent); }
.markdown-body img { max-width: 100%; height: auto; border: 1px solid var(--line-soft); }
.markdown-body blockquote {
  margin: 20px 0; padding: 4px 16px; border-left: 2px solid var(--accent);
  color: var(--fg-dim); background: rgba(228,0,43,.05);
}
.markdown-body code { font-family: var(--font-mono); font-size: .88em; background: #16161c; padding: .15em .4em; border: 1px solid var(--line-soft); }
.markdown-body pre { background: #0a0a0e; border: 1px solid var(--line); padding: 16px; overflow-x: auto; margin: 20px 0; }
.markdown-body pre code { background: none; padding: 0; border: none; font-size: 13.5px; line-height: 1.6; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 20px 0; font-size: 14px; display: block; overflow-x: auto; }
.markdown-body th, .markdown-body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.markdown-body th { background: var(--card); }
.markdown-body hr { border: 0; border-top: 1px solid var(--line-soft); margin: 32px 0; }
.markdown-body ul, .markdown-body ol { padding-left: 24px; }
.markdown-body li { margin: 4px 0; }

/* term clouds / trees */
.term-cloud { display: flex; flex-wrap: wrap; gap: 10px; padding: 24px 0; }
.term {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); padding: 6px 12px; font-size: 14px; font-family: var(--font-mono);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.term:hover { border-color: var(--accent); transform: translateY(-2px); }
.term .n { color: var(--fg-faint); font-size: 12px; }
.term-tree { padding: 24px 0; }
.term-tree ul { list-style: none; margin: 0; padding-left: 0; }
.term-tree ul ul { padding-left: 20px; border-left: 1px solid var(--line-soft); margin-left: 4px; }
.term-tree li { margin: 8px 0; }
.term-tree a { display: inline-flex; align-items: center; gap: 8px; }
.term-tree .n { color: var(--fg-faint); font-size: 12px; font-family: var(--font-mono); }

/* archive */
.archive-year { padding: 20px 0; border-bottom: 1px solid var(--line-soft); }
.archive-year h2 { font-size: 20px; margin: 0 0 12px; display: flex; align-items: baseline; gap: 10px; font-family: var(--font-mono); }
.archive-year .n { color: var(--fg-faint); font-size: 13px; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li { display: flex; gap: 16px; padding: 6px 0; align-items: baseline; }
.archive-list time { color: var(--fg-faint); font-family: var(--font-mono); font-size: 13px; flex: 0 0 48px; }

/* footer */
.site-footer { border-top: 1px solid var(--line-soft); margin-top: 60px; padding: 28px 0; color: var(--fg-faint); font-size: 13px; }
.site-footer .wrap { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.site-footer .sep { color: var(--accent); }

/* 浮动区块导航：默认收缩在侧边，点击展开 */
.float-nav {
  position: fixed; top: 50%; transform: translateY(-50%); z-index: 30;
  display: flex; align-items: center; gap: 0;
  font-family: var(--font-mono);
}
.float-nav[data-side="left"] { left: 0; flex-direction: row; }
.float-nav[data-side="right"] { right: 0; flex-direction: row-reverse; }

.float-nav-toggle {
  width: 34px; height: 34px; padding: 0;
  background: rgba(10,10,11,.9); border: 1px solid var(--line);
  color: var(--fg-dim); cursor: pointer; display: inline-flex;
  align-items: center; justify-content: center;
  backdrop-filter: blur(10px);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.float-nav-toggle:hover { color: var(--fg); border-color: var(--accent); }
.float-nav-icon { width: 14px; height: 2px; background: currentColor; position: relative; }
.float-nav-icon::before, .float-nav-icon::after { content: ''; position: absolute; left: 0; width: 14px; height: 2px; background: currentColor; }
.float-nav-icon::before { top: -5px; }
.float-nav-icon::after { top: 5px; }

.float-nav-list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 0;
  max-width: 0; overflow: hidden; white-space: nowrap;
  background: rgba(10,10,11,.9); backdrop-filter: blur(10px);
  border: 1px solid var(--line); border-left: 0; border-right: 0;
  transition: max-width .4s var(--ease), border-width .4s var(--ease), opacity .3s var(--ease);
  opacity: 0;
}
.float-nav.open .float-nav-list { max-width: 260px; opacity: 1; border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
.float-nav-list li { border-top: 1px solid var(--line-soft); }
.float-nav-list li:first-child { border-top: 0; }
.float-nav-list a {
  display: block; padding: 9px 14px; font-size: 12.5px; color: var(--fg-dim);
  letter-spacing: .02em; transition: color .2s var(--ease), background .2s var(--ease);
}
.float-nav-list a:hover { color: var(--fg); background: var(--bg-soft); }
.float-nav-list a.on { color: var(--accent); }

@media (max-width: 900px) {
  .float-nav-toggle { width: 30px; height: 30px; }
}

/* reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 640px) {
  .site-header .wrap { height: auto; padding: 10px 16px; flex-wrap: wrap; gap: 8px; }
  .site-nav { gap: 12px; font-size: 13px; flex-wrap: wrap; }
  .hero h1 { font-size: 26px; }
  .post-header h1 { font-size: 24px; }
  .wrap { padding: 0 16px; }
  .post-list .post-card { margin: 0 -16px; padding-left: 18px; padding-right: 16px; }
  .intro { grid-template-columns: 1fr; align-items: start; padding-top: 40px; }
  .intro-meta { align-items: flex-start; text-align: left; flex-direction: row; gap: 14px; }
  .post-grid { --grid-min: 220px; }
}