/* ============================================================
   招财猫Agent · 深空科幻主题
   分区：变量 → 基础 → 背景层 → 光辉 → 进度条 → header →
        hero → chips → 时间线 → 文章布局 → 正文排版 → 代码块 →
        TOC → 上下篇 → 搜索 → 404/错误/空态 → 动画 → 响应式 → 降级
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --bg-0: #182240;
  --bg-1: #202c52;
  --bg-2: #2a3a6b;
  --fg: #f2f5ff;
  --fg-muted: #b5bfe0;
  --fg-faint: #909ac0;

  --cyan: #22d3ee;
  --purple: #a78bfa;
  --cat-article: #a78bfa;
  --cat-tool: #34d399;

  --glass-bg: rgba(24, 34, 64, .62);
  --glass-border: rgba(160, 172, 210, .22);

  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 48px;

  --measure: 46rem;
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", Consolas, "JetBrains Mono", "SFMono-Regular", Menlo, monospace;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 106.25%; /* 基准 17px：中文长文阅读更舒适，rem 全局等比放大 */
}

body {
  font-family: var(--font-sans);
  background: var(--bg-0);
  color: var(--fg);
  line-height: 1.75;
  letter-spacing: .2px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: rgba(34, 211, 238, .3); color: var(--fg); }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; border-radius: 2px; }

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

kbd {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--fg-muted);
  border: 1px solid var(--glass-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  background: rgba(34, 46, 86, .65);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: fixed; top: -48px; left: var(--space-4); z-index: 200;
  padding: 8px 16px; border-radius: var(--radius-s);
  background: var(--bg-2); border: 1px solid var(--cyan);
  color: var(--fg); transition: top .2s;
}
.skip-link:focus { top: var(--space-4); }

/* 滚动条（webkit）：细窄霓虹 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--bg-2); border-radius: 6px; border: 2px solid var(--bg-0); }
::-webkit-scrollbar-thumb:hover { background: var(--fg-faint); }

/* ---------- 背景层：网格 + 星空 + 顶部光晕（纯 CSS 静态，零图片） ---------- */
.bg {
  position: fixed; inset: 0; z-index: -1;
  transform: translateZ(0); /* 提升为合成层，滚动零重绘 */
  background-color: var(--bg-0);
  background-image:
    /* 顶部紫色光晕 */
    radial-gradient(ellipse 80% 45% at 50% -8%, rgba(167, 139, 250, .18), transparent 70%),
    /* 星群 A：亮星 */
    radial-gradient(circle at 12% 22%, rgba(230, 233, 245, .9) 0 1px, transparent 1.6px),
    radial-gradient(circle at 68% 9%,  rgba(34, 211, 238, .7) 0 1px, transparent 1.6px),
    radial-gradient(circle at 88% 44%, rgba(230, 233, 245, .65) 0 1px, transparent 1.6px),
    radial-gradient(circle at 33% 73%, rgba(167, 139, 250, .65) 0 1px, transparent 1.6px),
    radial-gradient(circle at 54% 41%, rgba(230, 233, 245, .55) 0 1px, transparent 1.6px),
    radial-gradient(circle at 5% 88%,  rgba(230, 233, 245, .55) 0 1px, transparent 1.6px),
    radial-gradient(circle at 78% 82%, rgba(34, 211, 238, .45) 0 1px, transparent 1.6px),
    /* 星群 B：暗星（更小更密，视差层次） */
    radial-gradient(circle at 21% 55%, rgba(230, 233, 245, .4) 0 1px, transparent 1.4px),
    radial-gradient(circle at 42% 15%, rgba(230, 233, 245, .4) 0 1px, transparent 1.4px),
    radial-gradient(circle at 60% 66%, rgba(230, 233, 245, .35) 0 1px, transparent 1.4px),
    radial-gradient(circle at 95% 15%, rgba(230, 233, 245, .35) 0 1px, transparent 1.4px),
    radial-gradient(circle at 15% 38%, rgba(230, 233, 245, .3) 0 1px, transparent 1.4px),
    /* 网格 */
    linear-gradient(rgba(34, 211, 238, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, .06) 1px, transparent 1px);
  background-size:
    100% 100%,
    260px 260px, 260px 260px, 260px 260px, 260px 260px, 260px 260px, 260px 260px, 260px 260px,
    170px 170px, 170px 170px, 170px 170px, 170px 170px, 170px 170px,
    48px 48px, 48px 48px;
  background-position:
    0 0,
    0 0, 130px 70px, 60px 190px, 200px 120px, 90px 30px, 30px 220px, 170px 160px,
    40px 90px, 150px 10px, 10px 130px, 80px 60px, 120px 150px,
    0 0, 0 0;
}

/* file:// 直开时 style.css 本身加载不到；此规则仅在 HTTP 下生效——隐藏引导提示 */
.file-warning { display: none; }

/* ---------- 鼠标跟随光辉 ---------- */
/* 层级在内容之上（z-index:1）：配合 screen 混合模式扫过卡片与文字，只提亮不压暗 */
#glow {
  display: none; /* JS 判定环境后启用 */
  position: fixed;
  left: -280px; top: -280px; /* 圆心对准坐标，负偏移居中（直径 560px） */
  width: 560px; height: 560px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: screen; /* 旧浏览器退化为普通叠加，仍可见 */
  background:
    /* 内层：小而亮的青色核心 */
    radial-gradient(closest-side,
      rgba(96, 235, 255, .26) 0%,
      rgba(34, 211, 238, .15) 28%,
      transparent 55%),
    /* 外层：大而柔的青→紫光晕 */
    radial-gradient(closest-side,
      rgba(34, 211, 238, .2),
      rgba(167, 139, 250, .13) 48%,
      transparent 75%);
  will-change: transform;
}
#glow.on { display: block; }

/* ---------- 阅读进度条 ---------- */
#progress {
  position: fixed; top: 0; left: 0; z-index: 150;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  transform: scaleX(0); transform-origin: 0 50%;
  opacity: 0; visibility: hidden;
  will-change: transform;
}
#progress.on { opacity: 1; visibility: visible; }

/* ---------- header（毛玻璃 · 限定应用处 1/3） ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--glass-bg);
  /* blur 半径直接决定滚动时重采样开销：12px 视觉无感、开销更低 */
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid var(--glass-border);
}

.header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 var(--space-5);
  height: 60px;
  display: flex; align-items: center; gap: var(--space-4);
}

.site-logo {
  display: flex; align-items: center; gap: 10px;
  color: var(--fg); text-decoration: none; flex-shrink: 0;
}
.site-logo:hover { text-decoration: none; }

.logo-ring {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 50%;
  background:
    linear-gradient(var(--bg-0), var(--bg-0)) padding-box,
    linear-gradient(135deg, var(--cyan), var(--purple)) border-box;
  border: 1.5px solid transparent;
  box-shadow: 0 0 12px rgba(34, 211, 238, .35);
}
.logo-ring img { display: block; border-radius: 50%; }

.logo-text { font-weight: 400; font-size: 1.05rem; letter-spacing: .5px; }
.logo-text b {
  font-weight: 700;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.site-nav {
  display: flex; gap: var(--space-1);
  overflow-x: auto; scrollbar-width: none;
  margin-left: auto;
}
.site-nav::-webkit-scrollbar { display: none; }

.nav-link {
  padding: 6px 12px; border-radius: var(--radius-s);
  color: var(--fg-muted); font-size: .95rem;
  white-space: nowrap; text-decoration: none;
  transition: color .2s, background .2s;
}
.nav-link:hover { color: var(--fg); background: rgba(34, 211, 238, .08); text-decoration: none; }
.nav-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(34, 211, 238, .1);
  box-shadow: inset 0 -2px 0 var(--cyan);
}

.search-btn {
  display: flex; align-items: center; gap: var(--space-2);
  flex-shrink: 0;
  padding: 6px 12px; border-radius: var(--radius-s);
  border: 1px solid var(--glass-border);
  background: rgba(34, 46, 86, .5);
  color: var(--fg-muted); font-size: .85rem; font-family: inherit;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.search-btn:hover { border-color: var(--cyan); color: var(--fg); }
.search-key { font-family: var(--font-mono); font-size: .72rem; }

/* ---------- main / footer ---------- */
#app { flex: 1; width: 100%; }

.view {
  max-width: 1200px; margin: 0 auto;
  padding: var(--space-6) var(--space-5) 72px;
  width: 100%;
  animation: view-in .25s ease both;
}

.site-footer {
  border-top: 1px solid var(--glass-border);
  padding: var(--space-4) var(--space-5);
  text-align: center;
  color: var(--fg-faint); font-size: .85rem;
}

.site-footer .footer-motto {
  color: var(--fg-muted);
  letter-spacing: 1.5px;
}
.site-footer .icp { margin-top: var(--space-2); }
.site-footer .icp a {
  color: var(--fg-muted); text-decoration: none;
  transition: color .2s;
}
.site-footer .icp a:hover { color: var(--cyan); }

.noscript-box {
  max-width: var(--measure); margin: var(--space-6) auto;
  padding: var(--space-5);
  border: 1px solid var(--glass-border); border-radius: var(--radius-m);
  background: var(--bg-1);
}

/* ---------- hero ---------- */
.hero { text-align: center; padding: var(--space-5) 0 var(--space-6); }

.hero-logo {
  position: relative; display: inline-grid; place-items: center;
  width: 96px; height: 96px; margin-bottom: var(--space-4);
  border-radius: 50%;
  background:
    linear-gradient(var(--bg-0), var(--bg-0)) padding-box,
    linear-gradient(135deg, var(--cyan), var(--purple)) border-box;
  border: 2px solid transparent;
  box-shadow: 0 0 24px rgba(34, 211, 238, .4), 0 0 60px rgba(167, 139, 250, .25);
}
.hero-logo img { width: 78px; height: 78px; border-radius: 50%; display: block; }
/* 装饰轨道环 */
.hero-logo::after {
  content: ""; position: absolute; inset: -9px;
  border-radius: 50%;
  border: 1px dashed rgba(34, 211, 238, .3);
  animation: orbit-spin 24s linear infinite;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700; letter-spacing: 1px; line-height: 1.3;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(90deg, var(--cyan) 10%, var(--purple) 60%, var(--cyan) 90%);
  background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  /* 流光为 background-position 动画（触发重绘），放慢周期降低重绘频率 */
  animation: sheen 10s ease-in-out infinite;
}
.hero-sub { color: var(--fg-muted); margin-top: var(--space-3); font-size: 1.08rem; }

.hero-stats {
  display: flex; justify-content: center; gap: var(--space-5);
  margin-top: var(--space-4); flex-wrap: wrap;
  color: var(--fg-muted); font-size: .92rem;
}
.hero-stats b {
  font-size: 1.15rem; color: var(--fg);
  font-family: var(--font-mono); font-weight: 600;
  margin-right: 4px;
}

/* ---------- 分类 chips（路由链接） ---------- */
.chips {
  display: flex; flex-wrap: wrap; gap: var(--space-2);
  margin: var(--space-5) 0;
}
.chip {
  padding: 5px 14px; border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: rgba(34, 46, 86, .55);
  color: var(--fg-muted); font-size: .92rem; font-family: inherit;
  text-decoration: none;
  transition: border-color .2s, color .2s, box-shadow .2s;
}
.chip:hover { color: var(--fg); text-decoration: none; border-color: var(--cat, var(--cyan)); }
.chip--active {
  color: var(--fg);
  border-color: var(--cat, var(--cyan));
  background: rgba(34, 46, 86, .9);
  box-shadow: 0 0 10px color-mix(in srgb, var(--cat, var(--cyan)) 35%, transparent);
}
.chip .n { color: var(--fg-faint); margin-left: 4px; font-family: var(--font-mono); font-size: .78rem; }

/* ---------- 列表页头部 ---------- */
.list-head { margin: var(--space-3) 0 var(--space-2); }
.list-head h1 { font-size: 1.6rem; }
.list-head h1 span { color: var(--cat, var(--cyan)); }
.list-head p { color: var(--fg-muted); font-size: .92rem; margin-top: 2px; }

/* ---------- 时间线 ---------- */
.timeline { position: relative; margin-top: var(--space-4); padding-left: 30px; }
.timeline::before { /* 主轴线 */
  content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(180deg,
    var(--cyan), var(--purple) 55%, rgba(167, 139, 250, 0));
  opacity: .5; border-radius: 2px;
}

.tl-year {
  position: relative;
  font-size: 1.6rem; font-weight: 700;
  font-family: var(--font-mono);
  margin: var(--space-6) 0 var(--space-3);
  letter-spacing: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  text-shadow: none;
}
.tl-year:first-child { margin-top: 0; }
.tl-year::after {
  content: ""; display: block; height: 1px; margin-top: 6px;
  background: linear-gradient(90deg, rgba(34, 211, 238, .4), transparent 70%);
}

.tl-month-title {
  color: var(--fg-muted); font-size: .88rem;
  margin: var(--space-4) 0 var(--space-2);
  font-family: var(--font-mono); letter-spacing: 1px;
}

.tl-item {
  position: relative; margin-bottom: var(--space-4);
  /* 视口外的卡片跳过布局与绘制，长列表滚动更流畅、内存占用更低 */
  content-visibility: auto;
  contain-intrinsic-size: auto 190px;
}

.tl-dot {
  position: absolute; left: -30px; top: 22px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--bg-0);
  border: 2px solid var(--cat, var(--cyan));
  box-shadow: 0 0 8px color-mix(in srgb, var(--cat, var(--cyan)) 60%, transparent);
  z-index: 1;
}
.tl-card:hover ~ .tl-dot, .tl-item:hover .tl-dot {
  box-shadow: 0 0 14px color-mix(in srgb, var(--cat, var(--cyan)) 90%, transparent);
}

/* ---------- 卡片（实色玻璃感，不用 backdrop-filter） ---------- */
.tl-card {
  --cat: var(--cyan);
  position: relative; display: block;
  padding: var(--space-4) var(--space-5);
  background: var(--bg-1);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-m);
  color: var(--fg); text-decoration: none;
  transition: transform .25s ease, border-color .25s, box-shadow .25s, background .25s;
}
.tl-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  background: var(--bg-2);
  border-color: color-mix(in srgb, var(--cat) 55%, transparent);
  box-shadow:
    0 4px 18px rgba(0, 0, 0, .35),
    0 0 16px color-mix(in srgb, var(--cat) 18%, transparent),
    inset 0 0 24px rgba(21, 26, 48, .4);
}
/* 四角科幻刻线 */
.tl-card::before, .tl-card::after {
  content: ""; position: absolute; width: 10px; height: 10px;
  border-color: color-mix(in srgb, var(--cat) 70%, transparent);
  border-style: solid; opacity: 0;
  transition: opacity .25s;
}
.tl-card::before { top: -1px; left: -1px; border-width: 2px 0 0 2px; border-radius: var(--radius-m) 0 0 0; }
.tl-card::after { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; border-radius: 0 0 var(--radius-m) 0; }
.tl-card:hover::before, .tl-card:hover::after { opacity: 1; }

.tl-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-2) var(--space-3);
  font-size: .82rem; color: var(--fg-muted);
  font-family: var(--font-mono);
}
.tl-title {
  font-size: 1.2rem; font-weight: 650; margin: 7px 0 5px;
  color: var(--fg); line-height: 1.45;
}
.tl-card:hover .tl-title { color: color-mix(in srgb, var(--cat) 70%, var(--fg)); }
.tl-summary {
  color: var(--fg-muted); font-size: .95rem; line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tl-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.tl-tag {
  color: var(--fg-muted); font-size: .8rem;
  border: 1px solid var(--glass-border); border-radius: 999px;
  padding: 1px 10px;
}

/* 类别徽章 */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .74rem; padding: 1px 9px; border-radius: 999px;
  color: var(--cat);
  border: 1px solid color-mix(in srgb, var(--cat) 45%, transparent);
  background: color-mix(in srgb, var(--cat) 12%, transparent);
}
.badge svg { flex-shrink: 0; }

/* ---------- 文章视图 ---------- */
.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: var(--space-5);
  align-items: start;
  max-width: 980px; margin: 0 auto;
}
.post-layout.no-toc { grid-template-columns: minmax(0, 1fr); max-width: 760px; }

.post-card {
  background: var(--bg-1);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-l);
  padding: clamp(var(--space-4), 4vw, var(--space-6));
}

.post-head { border-bottom: 1px solid var(--glass-border); padding-bottom: var(--space-4); margin-bottom: var(--space-5); }

.post-title {
  font-size: clamp(1.5rem, 3.8vw, 2.2rem);
  line-height: 1.4; margin: var(--space-3) 0;
  overflow-wrap: break-word;
}

.post-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-2) var(--space-3);
  color: var(--fg-muted); font-size: .86rem; font-family: var(--font-mono);
}
.post-meta time { color: var(--fg-faint); }

.tool-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: var(--space-3);
  padding: 7px 16px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--cat-tool) 55%, transparent);
  color: var(--cat-tool); font-size: .9rem;
  transition: box-shadow .2s, background .2s;
}
.tool-link:hover {
  text-decoration: none;
  background: color-mix(in srgb, var(--cat-tool) 10%, transparent);
  box-shadow: 0 0 14px color-mix(in srgb, var(--cat-tool) 30%, transparent);
}

/* ---------- 正文排版（Markdown 渲染区） ---------- */
.post-body { font-size: 1.05rem; line-height: 1.9; color: var(--fg); overflow-wrap: break-word; }
.post-body > :first-child { margin-top: 0; }
.post-body h2 {
  font-size: 1.45rem; margin: 2.2em 0 .8em;
  padding-left: 12px; position: relative;
}
.post-body h2::before {
  content: ""; position: absolute; left: 0; top: .18em; bottom: .18em; width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--purple));
  box-shadow: 0 0 8px rgba(34, 211, 238, .5);
}
.post-body h3 { font-size: 1.2rem; margin: 1.8em 0 .6em; color: color-mix(in srgb, var(--fg) 88%, var(--cyan)); }
.post-body h4 { font-size: 1.05rem; margin: 1.5em 0 .5em; }
.post-body p { margin: 1em 0; }
.post-body a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--cyan) 50%, transparent); }
.post-body a:hover { text-decoration-color: var(--cyan); }
.post-body ul, .post-body ol { padding-left: 1.5em; margin: .9em 0; }
.post-body li { margin: .35em 0; }
.post-body li::marker { color: var(--cyan); }
.post-body blockquote {
  margin: 1.2em 0; padding: .6em 1.2em;
  border-left: 3px solid var(--cyan);
  background: rgba(34, 211, 238, .05);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  color: var(--fg-muted);
}
.post-body blockquote p { margin: .4em 0; }
.post-body img {
  border-radius: var(--radius-m);
  border: 1px solid var(--glass-border);
  margin: 1em auto; display: block;
}
.post-body hr {
  border: none; height: 1px; margin: 2.5em auto; width: 62%;
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, .5), transparent);
}
.post-body code:not(pre code) {
  font-family: var(--font-mono); font-size: .86em;
  background: rgba(34, 211, 238, .08);
  border: 1px solid rgba(34, 211, 238, .15);
  padding: .12em .4em; border-radius: 4px;
  color: color-mix(in srgb, var(--cyan) 75%, var(--fg));
}
.post-body table {
  display: block; overflow-x: auto;
  border-collapse: collapse; margin: 1.2em 0;
  font-size: .95rem; width: 100%;
}
.post-body th, .post-body td {
  border: 1px solid var(--glass-border);
  padding: 8px 12px; text-align: left;
}
.post-body th {
  background: rgba(34, 211, 238, .07);
  color: var(--fg); font-weight: 600; white-space: nowrap;
}
.post-body tbody tr:hover td { background: rgba(34, 211, 238, .04); }

/* ---------- 代码块（无高亮库，纯样式） ---------- */
.code-block {
  margin: 1.2em 0;
  border: 1px solid rgba(34, 211, 238, .22);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-m);
  background: #1a2447;
  box-shadow: inset 0 0 24px rgba(24, 34, 64, .55);
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 12px;
  border-bottom: 1px solid rgba(34, 211, 238, .15);
  background: rgba(34, 211, 238, .05);
}
.code-lang {
  font-family: var(--font-mono); font-size: .72rem;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--cyan);
}
.code-copy {
  font-family: var(--font-mono); font-size: .74rem;
  color: var(--fg-muted); background: none;
  border: 1px solid var(--glass-border); border-radius: 4px;
  padding: 2px 10px; cursor: pointer;
  transition: color .2s, border-color .2s;
}
.code-copy:hover { color: var(--cyan); border-color: var(--cyan); }
.code-copy.done { color: var(--cat-tool); border-color: var(--cat-tool); }
.code-block pre {
  padding: var(--space-4);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.code-block pre code {
  font-family: var(--font-mono); font-size: .88rem; line-height: 1.75;
  color: #d6e0fa; white-space: pre;
}

/* ---------- TOC（毛玻璃 · 限定应用处 3/3） ---------- */
.toc-desktop {
  position: sticky; top: 84px;
  max-height: calc(100vh - 110px); overflow-y: auto;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-m);
  padding: var(--space-4);
  font-size: .87rem;
  scrollbar-width: thin;
}
.toc-title {
  font-size: .76rem; letter-spacing: 2px; text-transform: uppercase;
  color: var(--fg-faint); font-family: var(--font-mono);
  margin-bottom: var(--space-3);
}
.toc ul { list-style: none; padding-left: 0; margin: 0; }
.toc li.lv3 { padding-left: 14px; }
.toc a {
  display: block; padding: 3px 10px;
  color: var(--fg-muted); text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  line-height: 1.5;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.toc a:hover { color: var(--fg); text-decoration: none; }
.toc a.active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(34, 211, 238, .1), transparent);
}

/* 移动端 TOC：折叠面板 */
.toc-mobile { display: none; margin-bottom: var(--space-4); }
.toc-mobile summary {
  cursor: pointer; color: var(--fg-muted); font-size: .88rem;
  padding: 8px 12px;
  border: 1px solid var(--glass-border); border-radius: var(--radius-m);
  background: var(--bg-1);
  user-select: none;
}
.toc-mobile[open] summary { border-bottom-left-radius: 0; border-bottom-right-radius: 0; color: var(--cyan); }
.toc-mobile .toc-inner {
  border: 1px solid var(--glass-border); border-top: none;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: var(--bg-1); padding: var(--space-3) var(--space-2);
}

/* ---------- 上下篇导航 ---------- */
.post-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3);
  margin-top: var(--space-6); padding-top: var(--space-5);
  border-top: 1px solid var(--glass-border);
}
.post-nav-item {
  display: flex; flex-direction: column; gap: 4px;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--glass-border); border-radius: var(--radius-m);
  background: var(--bg-1);
  text-decoration: none; color: var(--fg);
  transition: border-color .2s, transform .2s;
}
.post-nav-item:hover { text-decoration: none; border-color: var(--cyan); transform: translateY(-2px); }
.post-nav-item.next { text-align: right; align-items: flex-end; }
.post-nav-item.placeholder { visibility: hidden; }
.post-nav-label { font-size: .76rem; color: var(--fg-faint); font-family: var(--font-mono); }
.post-nav-title { font-size: .96rem; color: var(--fg-muted); }
.post-nav-item:hover .post-nav-title { color: var(--cyan); }

/* ---------- 搜索弹层（毛玻璃 · 限定应用处 2/3） ---------- */
#search-dialog {
  margin: 12vh auto auto;
  width: min(620px, 92vw);
  max-height: 64vh;
  border: 1px solid color-mix(in srgb, var(--cyan) 30%, var(--glass-border));
  border-radius: var(--radius-l);
  background: rgba(24, 32, 60, .82);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  backdrop-filter: blur(16px) saturate(1.5);
  box-shadow: 0 18px 60px rgba(0, 0, 0, .6), 0 0 40px rgba(34, 211, 238, .08);
  padding: var(--space-4);
  color: var(--fg);
  overflow: hidden auto;
}
#search-dialog::backdrop {
  background: rgba(4, 6, 14, .6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.search-box {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--glass-border); border-radius: var(--radius-m);
  background: rgba(28, 38, 70, .65);
  color: var(--fg-muted);
}
.search-box:focus-within { border-color: var(--cyan); box-shadow: 0 0 12px rgba(34, 211, 238, .15); }
#search-input {
  flex: 1; min-width: 0;
  background: none; border: none; outline: none;
  color: var(--fg); font-size: 1rem; font-family: inherit;
}
#search-input::placeholder { color: var(--fg-faint); }

#search-results { list-style: none; margin: var(--space-3) 0 0; padding: 0; }
.search-result-item a {
  display: block; padding: 10px 12px;
  border-radius: var(--radius-s);
  text-decoration: none; color: var(--fg);
  border: 1px solid transparent;
}
.search-result-item a:hover, .search-result-item.active a {
  text-decoration: none;
  background: rgba(34, 211, 238, .07);
  border-color: rgba(34, 211, 238, .25);
}
.sr-head { display: flex; align-items: center; gap: var(--space-2); }
.sr-title { font-size: 1rem; }
.sr-summary {
  margin-top: 2px; font-size: .86rem; color: var(--fg-muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
mark {
  background: rgba(34, 211, 238, .22);
  color: var(--cyan); border-radius: 2px; padding: 0 2px;
}
.search-empty { margin-top: var(--space-4); text-align: center; color: var(--fg-faint); font-size: .9rem; }

/* ---------- 404 / 错误 / 空态 / 加载 ---------- */
.view-404, .error-box, .empty-state {
  text-align: center; padding: var(--space-6) var(--space-4);
  max-width: 560px; margin: 0 auto;
}
.view-404 .code, .error-box .code {
  font-family: var(--font-mono); font-size: 4rem; font-weight: 700; letter-spacing: 8px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  filter: drop-shadow(0 0 18px rgba(34, 211, 238, .35));
}
.view-404 h1, .error-box h1 { font-size: 1.2rem; margin: var(--space-3) 0 var(--space-2); }
.view-404 p, .error-box p { color: var(--fg-muted); font-size: .92rem; }

.btn {
  display: inline-block; margin-top: var(--space-4);
  padding: 9px 26px; border-radius: 999px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: #061021; font-weight: 600; font-size: .92rem; font-family: inherit;
  text-decoration: none; cursor: pointer;
  transition: box-shadow .2s, transform .2s;
}
.btn:hover { text-decoration: none; box-shadow: 0 0 20px rgba(34, 211, 238, .4); transform: translateY(-1px); }
.btn-ghost {
  background: none; color: var(--cyan);
  border-color: color-mix(in srgb, var(--cyan) 50%, transparent);
}
.btn-ghost:hover { background: rgba(34, 211, 238, .08); }

.loading {
  max-width: 760px; margin: var(--space-6) auto;
  text-align: center; color: var(--fg-muted);
  font-family: var(--font-mono); font-size: .88rem; letter-spacing: 2px;
}
.loading::after {
  content: "···";
  animation: dots 1.2s steps(4) infinite;
}

/* ---------- 动画 ---------- */
@keyframes view-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes dots { 0% { content: ""; } 25% { content: "·"; } 50% { content: "··"; } 75% { content: "···"; } }
@keyframes sheen { 0%, 100% { background-position: 0% 0; } 50% { background-position: 100% 0; } }
@keyframes orbit-spin { to { transform: rotate(360deg); } }

/* 卡片进视口浮现 */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .post-layout { grid-template-columns: 1fr; max-width: 760px; }
  .toc-desktop { display: none; }
  .toc-mobile { display: block; }
}

@media (max-width: 768px) {
  html { font-size: 100%; } /* 移动端回落 16px 基准 */
  .header-inner { padding: 0 var(--space-4); gap: var(--space-2); }
  .site-header { -webkit-backdrop-filter: blur(8px) saturate(1.3); backdrop-filter: blur(8px) saturate(1.3); }
  .logo-text { display: none; } /* 小屏仅留图标，导航优先 */
  .search-key { display: none; }
  .search-btn { padding: 6px 9px; }
  .view { padding: var(--space-5) var(--space-4) 56px; }
  .tl-card { padding: var(--space-3) var(--space-4); }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav-item.next { text-align: left; align-items: flex-start; }
  #progress { height: 3px; }
}

/* ---------- 降级与可访问性 ---------- */
/* 不支持 backdrop-filter：改用高不透明实色 */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header, .toc-desktop, #search-dialog { background: rgba(24, 32, 60, .96); }
}

/* 减少动态效果：关闭所有动画与光辉 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .view { animation: none; }
  #glow, .hero-logo::after { display: none !important; }
}

/* color-mix 兜底（极老浏览器）：直接使用类别原色 */
@supports not (color: color-mix(in srgb, red 50%, blue)) {
  .tl-card:hover { border-color: var(--cat); box-shadow: 0 4px 18px rgba(0, 0, 0, .35); }
  .badge { border-color: var(--cat); background: var(--bg-2); }
}