/* =====================================================================
   PIXEL ARCADE v4 · 像素街机风设计系统（博客 / 导航站）
   目录
   1. Tokens 主题变量（亮 / 深）
   2. Base 重置、背景、排版
   3. Layout 容器、栅格
   4. Chrome 顶栏、导航、主题按钮、移动菜单、分类条、页脚
   5. Blog 首页 hero、贴纸插图、文章卡、HUD、进度条带、分页
   6. Post 文章页：目录、正文 prose、阅读进度、上下篇
   7. Directory 导航站：搜索、筛选、站点卡、空状态
   8. Motion 动效（全部集中在这里，可整体删除）
   9. Reduced motion / print
   ===================================================================== */

/* 1. Tokens ---------------------------------------------------------- */
:root {
  color-scheme: light;
  --bg: #f4f6f9; --panel: #eef2f6; --raised: #ffffff;
  --line: #d9dee6; --line-strong: #b9c1cd;
  --ink: #17202e; --muted: #5f6977; --faint: #8a93a1;      /* 仅用于图标、分隔符等非文字元素（对比度 3:1）*/
  --accent: #b45309; --accent-soft: #fbecd9; --on-accent: #ffffff;
  --paper: #ffffff;                 /* 贴纸 / 插图纸面，两种主题都保持白 */
  --shadow: #17202e;                /* 硬边阴影颜色：像素风不用模糊阴影 */
  --focus: #b45309;

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-pixel: "Press Start 2P", "Zpix", "Fusion Pixel 12px", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;

  --fs-xs: 12px; --fs-sm: 14px; --fs-md: 16px; --fs-lg: 18px; --fs-xl: 22px; --fs-2xl: 28px; --fs-3xl: 36px;
  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px; --s5: 24px; --s6: 32px; --s7: 48px; --s8: 64px;
  --px: 8px;                        /* 一个“像素块”的尺寸：方块、标记、进度格都用它 */
  --wrap: 1200px; --measure: 68ch;  /* 正文行宽 */
  --top-h: 64px;

  --dur-1: 120ms; --dur-2: 200ms; --dur-3: 320ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --snap: steps(3, end);            /* 像素“咔哒”感的缓动 */
}
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f141c; --panel: #151c27; --raised: #19212d;
  --line: #2a3342; --line-strong: #3b4657;
  --ink: #e6e9ef; --muted: #9aa3b3; --faint: #6f7889;
  --accent: #f2b33d; --accent-soft: #2e2416; --on-accent: #17202e;
  --paper: #ffffff; --shadow: #000000; --focus: #f2b33d;
}

/* 2. Base ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--top-h) + 16px); }
body {
  margin: 0; min-height: 100vh;
  color: var(--ink); font: 400 var(--fs-md)/1.75 var(--font-sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  background: var(--bg);
  background-image: radial-gradient(color-mix(in srgb, var(--muted) 16%, transparent) 1px, transparent 1.5px);
  background-size: 28px 28px;
}
/* 纸纹噪点：放到内容下面（z-index:-1），不再盖住图片和文字 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .05;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
}
html[data-theme="dark"] body::before { opacity: .035; filter: invert(1); }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; color: inherit; }
::selection { background: var(--ink); color: var(--bg); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.sr-only { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: 16px; top: -48px; z-index: 100; background: var(--ink); color: var(--bg); padding: 8px 14px; font-size: var(--fs-sm); }
.skip-link:focus { top: 12px; }
.icon { width: 16px; height: 16px; flex: none; image-rendering: pixelated; }
.icon-lg { width: 24px; height: 24px; }

.k, .eyebrow { font-family: var(--font-pixel); font-size: 11px; letter-spacing: .2em; color: var(--muted); text-transform: uppercase; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin: 0; }
.eyebrow i, .px { display: inline-block; width: var(--px); height: var(--px); background: var(--accent); flex: none; }
.muted { color: var(--muted); }
.num { font-variant-numeric: tabular-nums; }

/* 3. Layout ---------------------------------------------------------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 40px; }
.section { padding: var(--s7) 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s4); margin: 0 0 var(--s5); }
.section-head h2 { margin: 0; font-size: var(--fs-xl); font-weight: 600; letter-spacing: .04em; display: flex; align-items: center; gap: 10px; }
.section-head h2::before { content: ""; width: var(--px); height: var(--px); background: var(--accent); }
.section-head .more { font-size: var(--fs-sm); color: var(--muted); }
.section-head .more:hover { color: var(--accent); }

/* 4. Chrome ---------------------------------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.topbar .wrap { display: flex; align-items: center; gap: var(--s6); height: var(--top-h); }
.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand-mark { width: 28px; height: 28px; color: var(--ink); }
.brand-word { height: 12px; width: auto; color: var(--ink); }
.brand-cn { font-size: 18px; font-weight: 600; letter-spacing: .12em; }
.nav { display: flex; gap: var(--s5); font-size: var(--fs-sm); color: var(--muted); }
.nav a { position: relative; padding: 6px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: var(--s5); }
.score { display: flex; gap: var(--s5); text-align: right; }
.score small { display: block; font-size: 11px; letter-spacing: .2em; color: var(--muted); line-height: 1.4; }
.score b { font: 400 20px/1.2 var(--font-sans); font-variant-numeric: tabular-nums; }
.icon-btn {
  display: inline-flex; align-items: center; gap: 8px; height: 36px; padding: 0 12px;
  border: 1px solid var(--line-strong); background: var(--raised); color: var(--ink);
  font-size: 13px; letter-spacing: .08em; cursor: pointer;
}
.icon-btn:hover { border-color: var(--ink); }
.icon-btn .i-moon { display: none; }
html[data-theme="dark"] .icon-btn .i-sun { display: none; }
html[data-theme="dark"] .icon-btn .i-moon { display: block; }
.menu-btn { display: none; }
.drawer { display: none; }

.tabs { position: relative; display: flex; gap: var(--s6); border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none;
  -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 32px), transparent); mask-image: linear-gradient(90deg, #000 calc(100% - 32px), transparent); }
.tabs::-webkit-scrollbar { display: none; }
.tabs a { flex: none; white-space: nowrap; padding: var(--s5) 0 var(--s4); font-size: var(--fs-sm); color: var(--muted); letter-spacing: .06em; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs a b { font: 400 10px var(--font-pixel); letter-spacing: .12em; margin-right: 6px; }
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }

.footer { border-top: 1px solid var(--line); margin-top: var(--s7); }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s5); padding: var(--s6) 0; font-size: var(--fs-sm); color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--s5); }
.footer-links a { display: inline-flex; align-items: center; gap: 6px; }
.footer-links a:hover { color: var(--accent); }

/* 5. Blog ------------------------------------------------------------ */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: var(--s7); align-items: center; padding: var(--s7) 0; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: var(--fs-3xl); font-weight: 700; letter-spacing: .06em; line-height: 1.3; margin: var(--s4) 0 var(--s3); }
.hero h1 small { display: block; font-size: 18px; font-weight: 400; color: var(--muted); letter-spacing: .06em; margin-bottom: 4px; }
.hero p.lead { font-size: var(--fs-md); line-height: 1.9; color: var(--muted); max-width: 34em; margin: 0; }
.squares { display: flex; gap: 6px; margin: var(--s5) 0; }
.squares i { display: block; width: var(--px); height: var(--px); background: var(--line); }
.squares i.on { background: var(--accent); }
.btn { display: inline-flex; align-items: center; gap: 10px; height: 44px; padding: 0 18px; border: 2px solid var(--ink); background: var(--ink); color: var(--bg); font-size: var(--fs-sm); letter-spacing: .1em; box-shadow: 4px 4px 0 var(--accent); }
.btn .icon { color: currentColor; }
.btn-ghost { background: transparent; color: var(--ink); box-shadow: none; border-color: var(--line-strong); }
.next { display: inline-flex; align-items: center; gap: 8px; padding-bottom: 4px; border-bottom: 1px solid var(--accent); color: var(--accent); font-size: var(--fs-sm); letter-spacing: .12em; }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s5); }

/* 贴纸插图：图片已处理成透明底 + 白色模切边，两种主题都能直接放 */
.sticker { margin: 0; justify-self: center; text-align: center; }
.sticker img { width: 100%; height: auto; filter: drop-shadow(3px 3px 0 color-mix(in srgb, var(--shadow) 22%, transparent)); }
.sticker figcaption { margin-top: var(--s3); font: 400 10px/1.6 var(--font-pixel); letter-spacing: .14em; color: var(--muted); }
.sticker.tilt img { transform: rotate(-2deg); }

.cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s6); padding: var(--s6) 0 var(--s4); }
.card { position: relative; display: flex; flex-direction: column; border: 1px solid var(--line); background: var(--raised); }
.card-cover { aspect-ratio: 16 / 9; border-bottom: 1px solid var(--line); background: var(--panel); display: grid; place-items: center; overflow: hidden; }
.card-cover img { width: 100%; height: 100%; object-fit: cover; }
.card-cover svg { width: 72px; height: 48px; }
.card-cover .m { stroke: var(--muted); }
.card-cover .a { stroke: var(--accent); transform-origin: center; transform-box: fill-box; }
.card-body { display: flex; flex-direction: column; flex: 1; padding: var(--s4) var(--s4) var(--s5); }
.card h3 { font-size: 17px; font-weight: 600; letter-spacing: .02em; line-height: 1.5; margin: 0 0 var(--s2); }
.card h3 a::after { content: ""; position: absolute; inset: 0; }   /* 整卡可点 */
.card p { font-size: var(--fs-sm); line-height: 1.8; color: var(--muted); margin: 0 0 var(--s4); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card .foot { margin-top: auto; display: flex; flex-direction: column; gap: var(--s2); }
.tag { display: inline-flex; align-items: center; gap: 6px; font-size: var(--fs-xs); color: var(--muted); letter-spacing: .06em; }
.tag::before { content: ""; width: 6px; height: 6px; background: var(--accent); }
.lv { display: flex; align-items: center; gap: 4px; font-size: var(--fs-xs); color: var(--muted); letter-spacing: .1em; }
.lv span { margin-right: 8px; }
.lv i { display: block; width: 16px; height: 6px; background: var(--line); }
.lv i.on { background: var(--accent); }
.meta { display: flex; align-items: center; gap: 6px; font-size: var(--fs-xs); color: var(--muted); letter-spacing: .04em; font-variant-numeric: tabular-nums; }
.meta .icon { width: 12px; height: 12px; }
.enter { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; letter-spacing: .12em; color: var(--accent); margin-top: var(--s2); }
.enter .icon { width: 12px; height: 12px; }
.card.featured { grid-column: span 2; }
.card.featured .card-cover { aspect-ratio: 21 / 9; }

/* HUD：用 HTML 做真实数据，不再用“画出来的 HUD 图” */
.hud { display: inline-flex; align-items: center; gap: var(--s4); padding: 8px 14px; border: 2px solid var(--ink); background: var(--raised); box-shadow: 4px 4px 0 var(--line-strong); font-size: var(--fs-xs); letter-spacing: .1em; }
.hud > span { display: inline-flex; align-items: center; gap: 8px; }
.hud .cells { display: inline-flex; border: 2px solid var(--ink); }
.hud .cells i { width: 14px; height: 12px; background: transparent; }
.hud .cells i + i { border-left: 2px solid var(--ink); }
.hud .cells i.on { background: var(--accent); }
.hud .stars { display: inline-flex; gap: 2px; }
.hud .stars .icon { width: 14px; height: 14px; color: var(--ink); }
.hud .stars .off { opacity: .25; }

.strip { display: flex; align-items: center; gap: var(--s5); border-top: 1px solid var(--line); padding: var(--s5) 0; }
.strip .coin { width: 56px; flex: none; }
.strip .char { width: 72px; margin-left: auto; flex: none; }
.strip p { font-size: var(--fs-sm); line-height: 1.8; color: var(--muted); margin: 0; max-width: 34em; }
.strip b { font-weight: 600; color: var(--ink); }
.coins { display: flex; gap: 4px; margin-top: 6px; }
.coins .icon { width: 14px; height: 14px; color: var(--ink); }
.coins .off { opacity: .2; filter: grayscale(1); }

.marquee { position: relative; display: flex; align-items: center; gap: var(--s3); overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 12px 0; }
.marquee-view { overflow: hidden; flex: 1; -webkit-mask-image: linear-gradient(90deg, transparent, #000 40px, #000 calc(100% - 40px), transparent); mask-image: linear-gradient(90deg, transparent, #000 40px, #000 calc(100% - 40px), transparent); }
.marquee-track { display: flex; width: max-content; }
.marquee-track span { flex: none; padding-right: 48px; font: 400 10px/1.6 var(--font-pixel); letter-spacing: .12em; color: var(--muted); white-space: nowrap; }
.marquee-toggle { flex: none; width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--line-strong); background: var(--raised); cursor: pointer; font-size: 10px; }

.pager { display: flex; justify-content: center; gap: 6px; padding: var(--s6) 0; font-variant-numeric: tabular-nums; }
.pager a, .pager span { min-width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--line); background: var(--raised); font-size: var(--fs-sm); }
.pager a:hover { border-color: var(--ink); }
.pager [aria-current="page"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* 6. Post ------------------------------------------------------------ */
.progress { position: fixed; left: 0; right: 0; top: 0; height: 3px; z-index: 60; pointer-events: none; }
.progress i { display: block; height: 100%; width: 100%; background: var(--accent); transform: scaleX(var(--p, 0)); transform-origin: left; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; padding: var(--s5) 0 0; font-size: var(--fs-xs); color: var(--muted); letter-spacing: .06em; }
.crumbs a:hover { color: var(--accent); }
.crumbs span[aria-hidden] { color: var(--faint); }
.post-head { padding: var(--s6) 0 var(--s5); border-bottom: 1px solid var(--line); }
.post-head h1 { font-size: clamp(26px, 4vw, var(--fs-3xl)); line-height: 1.35; letter-spacing: .04em; margin: var(--s3) 0 var(--s4); max-width: 22em; }
.post-head .meta { flex-wrap: wrap; gap: 6px 16px; font-size: var(--fs-sm); }
.post-head .meta > span { display: inline-flex; align-items: center; gap: 6px; }
.post-head .hud { margin-top: var(--s5); }
.post-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: var(--s7); padding: var(--s6) 0; }
.toc { position: sticky; top: calc(var(--top-h) + 24px); align-self: start; font-size: var(--fs-sm); max-height: calc(100vh - var(--top-h) - 48px); overflow: auto; }
.toc .k { display: block; margin-bottom: var(--s3); }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc li a { display: block; padding: 5px 0 5px 14px; margin-left: -1px; border-left: 2px solid transparent; color: var(--muted); line-height: 1.5; }
.toc li.sub a { padding-left: 28px; font-size: 13px; }
.toc a:hover { color: var(--ink); }
.toc a.on { color: var(--ink); border-left-color: var(--accent); }

.prose { max-width: var(--measure); font-size: 17px; line-height: 1.9; overflow-wrap: anywhere; }
.prose > * + * { margin-top: 1.1em; }
.prose p, .prose ul, .prose ol, .prose blockquote, .prose figure, .prose pre, .prose table { margin-bottom: 0; }
.prose h2 { font-size: var(--fs-xl); line-height: 1.45; margin: 2.2em 0 .2em; letter-spacing: .03em; display: flex; align-items: baseline; gap: 12px; }
.prose h2::before { content: ""; flex: none; width: var(--px); height: var(--px); background: var(--accent); transform: translateY(-3px); }
.prose h3 { font-size: var(--fs-lg); margin: 1.8em 0 .2em; }
.prose a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.prose a:hover { text-decoration-thickness: 2px; }
.prose strong { font-weight: 600; }
.prose ul { list-style: none; padding-left: 1.4em; }
.prose ul li { position: relative; }
.prose ul li::before { content: ""; position: absolute; left: -1.1em; top: .78em; width: 6px; height: 6px; background: var(--accent); }
.prose ol { padding-left: 1.6em; }
.prose ol li::marker { font-family: var(--font-mono); color: var(--accent); }
.prose li + li { margin-top: .35em; }
.prose blockquote { margin-left: 0; margin-right: 0; padding: var(--s3) var(--s5); border-left: 4px solid var(--accent); background: var(--panel); color: var(--muted); }
.prose code { font-family: var(--font-mono); font-size: .88em; padding: .12em .4em; background: var(--panel); border: 1px solid var(--line); }
.prose pre { padding: var(--s4) var(--s5); background: #121924; color: #e6e9ef; border: 2px solid var(--ink); box-shadow: 4px 4px 0 var(--line-strong); overflow-x: auto; font-size: 14px; line-height: 1.7; }
.prose pre code { padding: 0; background: none; border: 0; font-size: inherit; color: inherit; }
.prose figure { margin-left: 0; margin-right: 0; }
.prose figure img { border: 1px solid var(--line); background: var(--paper); }
.prose figure.art img { width: min(100%, 420px); margin: 0 auto; border: 0; background: none; filter: drop-shadow(3px 3px 0 color-mix(in srgb, var(--shadow) 22%, transparent)); }
.prose figcaption { margin-top: var(--s2); font-size: var(--fs-xs); color: var(--muted); text-align: center; }
.prose hr { border: 0; height: var(--px); margin: 2.4em 0; background: repeating-linear-gradient(90deg, var(--line-strong) 0 var(--px), transparent var(--px) calc(var(--px) * 2)); }
.table-scroll { overflow-x: auto; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.prose th { background: var(--panel); font-weight: 600; }
.callout { display: flex; gap: var(--s3); padding: var(--s4); border: 2px solid var(--ink); background: var(--accent-soft); font-size: 15px; line-height: 1.8; }
.callout .icon { margin-top: 4px; color: var(--ink); }
html[data-theme="dark"] .prose img:not([data-keep]) { filter: brightness(.92); }

.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s5); padding: var(--s6) 0; border-top: 1px solid var(--line); }
.post-nav a { display: block; padding: var(--s4) var(--s5); border: 1px solid var(--line); background: var(--raised); }
.post-nav a:last-child { text-align: right; }
.post-nav small { display: block; font: 400 10px/1.8 var(--font-pixel); letter-spacing: .14em; color: var(--muted); }
.post-nav b { font-weight: 600; }
.back-top { position: fixed; right: 20px; bottom: 20px; z-index: 40; width: 44px; height: 44px; display: grid; place-items: center; border: 2px solid var(--ink); background: var(--raised); color: var(--ink); box-shadow: 3px 3px 0 var(--accent); cursor: pointer; opacity: 0; visibility: hidden; }
.back-top.show { opacity: 1; visibility: visible; }

/* 7. Directory ------------------------------------------------------- */
.dir-hero { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: var(--s7); align-items: center; padding: var(--s7) 0 var(--s6); }
.dir-hero h1 { font-size: var(--fs-3xl); line-height: 1.3; letter-spacing: .05em; margin: var(--s4) 0 var(--s3); }
.search { position: relative; display: flex; align-items: center; max-width: 640px; margin-top: var(--s5); border: 2px solid var(--ink); background: var(--raised); box-shadow: 4px 4px 0 var(--accent); }
.search .icon { position: absolute; left: 16px; width: 20px; height: 20px; color: var(--ink); pointer-events: none; }
.search input { flex: 1; min-width: 0; height: 52px; padding: 0 56px 0 48px; border: 0; background: transparent; font-size: var(--fs-md); outline: none; }
.search input::placeholder { color: var(--muted); }
.search:focus-within { outline: 2px solid var(--focus); outline-offset: 3px; }
.search kbd { position: absolute; right: 14px; font: 400 10px/1 var(--font-pixel); padding: 5px 7px; border: 1px solid var(--line-strong); color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: var(--s4) 0; }
.chip { display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px; border: 1px solid var(--line-strong); background: var(--raised); font-size: 13px; letter-spacing: .04em; cursor: pointer; }
.chip .n { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.chip:hover { border-color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.chip[aria-pressed="true"] .n { color: inherit; opacity: .7; }
.dir-layout { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: var(--s7); padding-bottom: var(--s6); }
.dir-index { position: sticky; top: calc(var(--top-h) + 24px); align-self: start; font-size: var(--fs-sm); }
.dir-index a { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 6px 10px; border-left: 2px solid var(--line); color: var(--muted); }
.dir-index a:hover, .dir-index a.on { color: var(--ink); border-left-color: var(--accent); }
.dir-index .n { font-size: 11px; font-variant-numeric: tabular-nums; }
.dir-group { padding: var(--s5) 0 var(--s6); }
.dir-group + .dir-group { border-top: 1px solid var(--line); }
.sites { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--s4); }
.site { position: relative; display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 4px 12px; padding: var(--s4); border: 1px solid var(--line); background: var(--raised); }
.site-icon { grid-row: span 2; width: 40px; height: 40px; display: grid; place-items: center; border: 2px solid var(--ink); background: var(--paper); color: #17202e; font: 400 14px var(--font-pixel); overflow: hidden; image-rendering: pixelated; }
.site-icon img { width: 24px; height: 24px; }
.site-icon[data-c="1"] { background: #fbecd9; } .site-icon[data-c="2"] { background: #dfe9f5; } .site-icon[data-c="3"] { background: #e3f1e4; } .site-icon[data-c="4"] { background: #f3e3ef; }
.site h3 { margin: 0; font-size: 15px; font-weight: 600; line-height: 1.5; display: flex; align-items: center; gap: 6px; min-width: 0; }
.site h3 a { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.site h3 a::after { content: ""; position: absolute; inset: 0; }
.site h3 .icon { width: 10px; height: 10px; color: var(--faint); flex: none; }
.site p { margin: 0; font-size: 13px; line-height: 1.6; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.site .tags { grid-column: 2; display: flex; flex-wrap: wrap; gap: 4px 10px; margin-top: 4px; }
.site .tags span { font-size: 11px; color: var(--muted); }
.site.pin::before { content: "HOT"; position: absolute; top: -1px; right: -1px; padding: 2px 6px; background: var(--accent); color: var(--on-accent); font: 400 8px/1.6 var(--font-pixel); letter-spacing: .1em; }
.empty { display: none; text-align: center; padding: var(--s7) 0; color: var(--muted); }
.empty img { width: 120px; margin: 0 auto var(--s4); }
.empty.show { display: block; }
[hidden] { display: none !important; }

/* Responsive --------------------------------------------------------- */
@media (max-width: 1080px) {
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .score { display: none; }
  .post-layout { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
  .dir-layout { grid-template-columns: minmax(0, 1fr); }
  .dir-index { display: none; }
  .dir-hero { grid-template-columns: minmax(0, 1fr) 260px; }
}
@media (max-width: 760px) {
  :root { --top-h: 56px; }
  .wrap { padding: 0 20px; }
  .nav, .icon-btn .label { display: none; }
  .menu-btn { display: inline-flex; padding: 0 10px; }
  .drawer { display: block; border-top: 1px solid var(--line); background: var(--bg); }
  .drawer[hidden] { display: none !important; }
  .drawer a { display: flex; align-items: center; gap: 10px; padding: 14px 20px; border-bottom: 1px solid var(--line); font-size: var(--fs-md); }
  .drawer a[aria-current="page"] { color: var(--accent); }
  .top-actions { gap: 8px; }
  .hero, .dir-hero { grid-template-columns: minmax(0, 1fr); gap: var(--s5); padding: var(--s6) 0; }
  .hero .sticker { width: 132px; order: -1; justify-self: start; }
  .hero .sticker figcaption { display: none; }
  .dir-hero .sticker { display: none; }
  .hero h1, .dir-hero h1 { font-size: var(--fs-2xl); }
  .cards { grid-template-columns: minmax(0, 1fr); gap: var(--s4); }
  .card.featured { grid-column: auto; }
  .card { flex-direction: row; }
  .card-cover { width: 96px; aspect-ratio: 1; border-bottom: 0; border-right: 1px solid var(--line); flex: none; }
  .card-cover svg { width: 56px; }
  .card.featured { flex-direction: column; }
  .card.featured .card-cover { width: auto; aspect-ratio: 16 / 9; border-right: 0; border-bottom: 1px solid var(--line); }
  .card p { -webkit-line-clamp: 2; }
  .strip .char { display: none; }
  .prose { font-size: 16px; }
  .post-nav { grid-template-columns: minmax(0, 1fr); }
  .post-nav a:last-child { text-align: left; }
  .sites { grid-template-columns: minmax(0, 1fr); }
  .chips { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin: 0 -20px; padding: var(--s4) 20px; }
  .chip { flex: none; }
  .hud { flex-wrap: wrap; gap: 10px 16px; }
}

/* 8. Motion ----------------------------------------------------------
   预算：同屏最多 1 个持续动效（跑马灯或硬币浮动二选一常驻），其余只在悬停 / 状态切换时触发。
   正文、标题、列表永远不做入场动画。所有持续动效在离开视口时暂停（JS 加 .is-off）。 */
.blink { animation: blink 1.4s steps(1) 3; }                    /* 只闪 3 次（约 4 秒），之后常亮 */
@keyframes blink { 0%, 60% { opacity: 1; } 61%, 100% { opacity: 0; } }

.bob.in { animation: bob 1.2s var(--ease) 2; }                 /* 进入视口跳 2 下就停，不常驻 */
@media (hover: hover) { .bob:hover { animation: bob 1.2s var(--ease) 1; } }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
.is-off, .is-off * { animation-play-state: paused !important; }

.marquee-track { animation: scroll 40s linear infinite; }
.marquee:hover .marquee-track, .marquee:focus-within .marquee-track, .marquee.paused .marquee-track { animation-play-state: paused; }
@keyframes scroll { to { transform: translateX(-50%); } }

.nav a::after { transition: transform var(--dur-3) var(--ease); }
.tabs a, .chip, .icon-btn, .pager a, .dir-index a, .toc a { transition: color var(--dur-2), background-color var(--dur-2), border-color var(--dur-2); }
.brand:hover .brand-mark { animation: hop .36s var(--snap); }
@keyframes hop { 50% { transform: translateY(-3px); } }
.next .icon, .enter .icon { transition: transform var(--dur-2) var(--snap); }
.next:hover .icon, .card:hover .enter .icon { transform: translateX(4px); }
.btn { transition: transform var(--dur-1) var(--snap), box-shadow var(--dur-1) var(--snap); }
.btn:active { transform: translate(4px, 4px); box-shadow: 0 0 0 var(--accent); }   /* 按下 = 阴影收回，像实体按键 */
.back-top { transition: opacity var(--dur-2), visibility var(--dur-2), transform var(--dur-1) var(--snap); }
.back-top:active { transform: translate(3px, 3px); }
.progress i { transition: transform 80ms linear; }

@media (hover: hover) and (pointer: fine) {
  .card, .site, .post-nav a { transition: transform var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease), border-color var(--dur-2); }
  .card:hover, .site:hover, .post-nav a:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--shadow); border-color: var(--ink); }
  .card-cover .a { transition: transform var(--dur-3) var(--snap); }
  .card:hover .card-cover .a { transform: scale(1.2); }
  .card-cover img { transition: transform .5s var(--ease); }
  .card:hover .card-cover img { transform: scale(1.04); }
  .card .enter { opacity: .0; transition: opacity var(--dur-2); }
  .card:hover .enter, .card:focus-within .enter { opacity: 1; }
  .sticker img { transition: transform var(--dur-3) var(--ease); }
  .sticker:hover img { transform: rotate(0) translateY(-2px); }
  .btn:hover { transform: translate(-1px, -1px); box-shadow: 5px 5px 0 var(--accent); }
  .site:hover .site-icon { animation: hop .36s var(--snap); }
}
/* 主题切换时只过渡颜色，且只在切换那一刻（JS 给 html 加 .theme-anim 300ms） */
.theme-anim, .theme-anim * { transition: background-color var(--dur-3), color var(--dur-3), border-color var(--dur-3) !important; }

/* 9. Reduced motion / print ----------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .marquee-track { animation: none; }
  .marquee-toggle { display: none; }
}
@media print {
  body { background: #fff; color: #000; }
  body::before, .topbar, .tabs, .toc, .marquee, .back-top, .progress, .post-nav, .footer { display: none !important; }
  .post-layout { display: block; }
  .prose a::after { content: " (" attr(href) ")"; font-size: .8em; color: #555; }
}