/* ==========================================================================
   Stardust Blog — Design System
   Style: 深空暗色 (Dark Mode OLED) + Glassmorphism
   Palette: 深空底 + 青/紫/玫红 星云渐变强调色
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

img, svg, video { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

/* ---------- 2. Design Tokens ---------- */
:root {
  /* 背景 */
  --void: #03040b;
  --void-2: #070a18;
  --void-3: #0b1024;

  /* 文字（深色底上的对比度均 ≥ 4.5:1） */
  --ink: #e9ecf8;
  --ink-2: #b6bfd8;
  --ink-3: #8590b2;

  /* 描边 / 玻璃 */
  --line: rgba(255, 255, 255, 0.09);
  --line-2: rgba(255, 255, 255, 0.18);
  --glass: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.018));
  --glass-strong: linear-gradient(180deg, rgba(24, 30, 58, 0.72), rgba(12, 16, 34, 0.6));

  /* 强调色（星云三色） */
  --cyan: #63e4f5;
  --violet: #a88bfa;
  --rose: #fb7fc0;
  --gold: #ffd9a0;
  --grad: linear-gradient(108deg, var(--cyan) 0%, var(--violet) 52%, var(--rose) 100%);
  --glow-cyan: rgba(99, 228, 245, 0.35);
  --glow-violet: rgba(168, 139, 250, 0.32);

  /* 形状 */
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 24px;
  --container: 1080px;
  --reading: 720px;
  --pad: clamp(20px, 5vw, 40px);

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t-fast: 160ms;
  --t: 240ms;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  color-scheme: dark;
}

/* ---------- 3. 基础排版 ---------- */
html { scroll-behavior: smooth; }

body {
  min-height: 100%;
  background-color: var(--void);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background: rgba(99, 228, 245, 0.28);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 细滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.03); }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.14);
  border: 2px solid transparent;
  background-clip: padding-box;
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.26); background-clip: padding-box; }

/* ---------- 4. 背景层 ---------- */
.bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
  background:
    radial-gradient(120% 90% at 50% 42%, #0d1330 0%, #070a18 42%, #03040b 100%);
}

/* 顶部/底部渐隐，让内容区始终可读 */
.bg-veil {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(70% 50% at 50% 50%, rgba(3, 4, 11, 0) 35%, rgba(3, 4, 11, 0.55) 100%),
    linear-gradient(180deg, rgba(3, 4, 11, 0.72) 0%, rgba(3, 4, 11, 0) 26%,
      rgba(3, 4, 11, 0) 62%, rgba(3, 4, 11, 0.88) 100%);
}

/* 极细噪点，避免大面积渐变出现色带 */
.bg-grain {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/></filter><rect width='140' height='140' filter='url(%23n)' opacity='0.32'/></svg>");
}

/* ---------- 5. 布局 ---------- */
.shell {
  position: relative;
  z-index: 3;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad);
}

main { flex: 1 1 auto; }

.skip-link {
  position: absolute;
  left: 50%;
  top: -100px;
  z-index: 99;
  transform: translateX(-50%);
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--void-3);
  border: 1px solid var(--line-2);
  transition: top var(--t) var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 6. 浮动导航 ---------- */
.nav {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  left: calc(16px + env(safe-area-inset-left, 0px));
  right: calc(16px + env(safe-area-inset-right, 0px));
  z-index: 40;
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--container);
  margin-inline: auto;
  padding: 10px 12px 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(9, 12, 26, 0.55);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  box-shadow: 0 10px 30px -16px rgba(0, 0, 0, 0.9);
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease);
}

.nav.is-scrolled .nav__inner {
  background: rgba(9, 12, 26, 0.82);
  border-color: var(--line-2);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  min-width: 0;
}

.brand__mark {
  width: 26px;
  height: 26px;
  flex: none;
  color: var(--cyan);
  filter: drop-shadow(0 0 10px var(--glow-cyan));
}

.brand__text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-2);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.nav__link:hover { color: var(--ink); background: rgba(255, 255, 255, 0.06); }

.nav__link[aria-current="page"] {
  color: var(--void);
  background: var(--grad);
  font-weight: 600;
}

.nav__icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  color: var(--ink-3);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav__icon-link:hover { color: var(--cyan); background: rgba(255, 255, 255, 0.06); }

.nav__toggle { display: none; }

/* ---------- 7. Hero ---------- */
.hero {
  padding: clamp(140px, 20vh, 220px) 0 clamp(56px, 9vh, 96px);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 13px;
  color: var(--ink-2);
}

.hero__badge svg { width: 15px; height: 15px; color: var(--cyan); flex: none; }

.hero__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #5ee6a8;
  box-shadow: 0 0 0 3px rgba(94, 230, 168, 0.16);
}

.hero__title {
  margin-top: 26px;
  font-size: clamp(36px, 7vw, 68px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.hero__title em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__typed {
  margin-top: 18px;
  min-height: 1.9em;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.4vw, 19px);
  color: var(--ink-2);
}

.hero__typed::after {
  content: "";
  display: inline-block;
  width: 9px;
  height: 1.05em;
  margin-left: 4px;
  vertical-align: -0.16em;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--glow-cyan);
  animation: caret 1.05s steps(1, end) infinite;
}

@keyframes caret {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.hero__lede {
  max-width: 620px;
  margin-top: 22px;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--ink-2);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease),
    border-color var(--t) var(--ease), background var(--t) var(--ease), color var(--t) var(--ease);
}

.btn svg { width: 17px; height: 17px; flex: none; }

.btn--primary {
  color: #04060f;
  background: var(--grad);
  box-shadow: 0 14px 34px -16px var(--glow-violet);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 44px -16px var(--glow-violet);
}

.btn--ghost {
  color: var(--ink);
  border-color: var(--line-2);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.btn--ghost:hover { border-color: rgba(99, 228, 245, 0.5); color: var(--cyan); }

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: 42px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.hero__meta b { color: var(--ink); font-weight: 600; }

/* ---------- 8. 区块标题 ---------- */
.section { padding-bottom: clamp(60px, 10vh, 110px); }

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section__title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 650;
  letter-spacing: -0.01em;
}

.section__title svg { width: 20px; height: 20px; color: var(--cyan); }

.section__note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  white-space: nowrap;
}

/* ---------- 9. 文章列表 ---------- */
.posts {
  display: grid;
  gap: 16px;
}

.post {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 20px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  overflow: hidden;
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease),
    box-shadow var(--t) var(--ease);
}

/* 顶部渐变高光条 */
.post::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: var(--grad);
  opacity: 0;
  transition: opacity var(--t) var(--ease);
}

a.post { cursor: pointer; }

a.post:hover {
  transform: translateY(-3px);
  border-color: rgba(120, 210, 245, 0.34);
  box-shadow: 0 24px 50px -26px var(--glow-cyan);
}

a.post:hover::before { opacity: 0.9; }

a.post:hover .post__title { color: var(--cyan); }

a.post:hover .post__go {
  color: var(--cyan);
  transform: translateX(3px);
  opacity: 1;
}

.post__main { min-width: 0; }

.post__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.post__meta span { display: inline-flex; align-items: center; gap: 6px; }

.post__meta svg { width: 13px; height: 13px; opacity: 0.85; }

.post__pin {
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(99, 228, 245, 0.36);
  background: rgba(99, 228, 245, 0.1);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.post__title {
  font-size: clamp(18px, 2.4vw, 21px);
  font-weight: 650;
  line-height: 1.4;
  transition: color var(--t-fast) var(--ease);
}

.post__excerpt {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--ink-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post__excerpt code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.06);
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--gold);
}

.post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag {
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  font-size: 12px;
  color: var(--ink-3);
}

.post__go {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex: none;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink-3);
  opacity: 0.7;
  transition: transform var(--t) var(--ease), color var(--t-fast) var(--ease),
    opacity var(--t) var(--ease), border-color var(--t-fast) var(--ease);
}

.post__go svg { width: 18px; height: 18px; }

/* 精选（置顶）卡片 */
.post--featured {
  padding: 30px 30px 32px;
  border-color: rgba(168, 139, 250, 0.28);
  background: var(--glass-strong);
  box-shadow: 0 30px 70px -40px var(--glow-violet);
}

.post--featured::before { opacity: 0.65; }

.post--featured .post__title { font-size: clamp(21px, 3vw, 26px); }

/* 未发布占位 */
.post--soon { opacity: 0.62; }
.post--soon .post__title { color: var(--ink-2); }
.post--soon .post__go { opacity: 0.35; }
.post__soon-badge {
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  color: var(--ink-3);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.list-foot {
  display: flex;
  justify-content: center;
  margin-top: 26px;
}

/* ---------- 10. 关于 / 结尾 ---------- */
.about {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.card:hover { border-color: var(--line-2); transform: translateY(-2px); }

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--cyan);
}

.card__icon svg { width: 19px; height: 19px; }

.card__title { font-size: 16px; font-weight: 650; }

.card__text { margin-top: 8px; font-size: 14px; color: var(--ink-2); }

/* ---------- 11. 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 30px 0 calc(40px + env(safe-area-inset-bottom, 0px));
  margin-top: auto;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  font-size: 13px;
  color: var(--ink-3);
}

.footer__links { display: flex; align-items: center; gap: 6px; }

.footer__links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 8px;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.footer__links a:hover { color: var(--cyan); background: rgba(255, 255, 255, 0.05); }
.footer__links svg { width: 15px; height: 15px; }

.footer__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  opacity: 0.8;
}

/* ---------- 12. 文章详情页 ---------- */
.article { padding-top: clamp(120px, 16vh, 170px); }

.article__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-3);
  transition: color var(--t-fast) var(--ease);
}
.article__back:hover { color: var(--cyan); }
.article__back svg { width: 15px; height: 15px; }

.article__header {
  max-width: var(--reading);
  margin: 26px auto 0;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}
.article__meta span { display: inline-flex; align-items: center; gap: 6px; }
.article__meta svg { width: 13px; height: 13px; }

.article__title {
  margin-top: 18px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.article__lede {
  margin-top: 16px;
  font-size: clamp(15px, 1.8vw, 17.5px);
  color: var(--ink-2);
}

.article__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }

.article__divider {
  max-width: var(--reading);
  margin: 30px auto;
  height: 1px;
  background: linear-gradient(90deg, var(--line-2), rgba(255, 255, 255, 0));
}

/* 正文排版 */
.prose {
  max-width: var(--reading);
  margin-inline: auto;
  font-size: 16.5px;
  color: var(--ink-2);
}

.prose > * + * { margin-top: 20px; }

.prose h2 {
  margin-top: 52px;
  padding-top: 6px;
  font-size: clamp(20px, 2.6vw, 25px);
  font-weight: 660;
  color: var(--ink);
  letter-spacing: -0.01em;
  scroll-margin-top: 110px;
}

.prose h2::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 16px;
  border-radius: 999px;
  background: var(--grad);
}

.prose h3 {
  margin-top: 34px;
  font-size: 17.5px;
  font-weight: 650;
  color: var(--ink);
  scroll-margin-top: 110px;
}

.prose strong { color: var(--ink); font-weight: 650; }

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(99, 228, 245, 0.35);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.prose a:hover { color: #fff; border-color: #fff; }

.prose ul, .prose ol { padding-left: 4px; display: grid; gap: 10px; }

.prose li { position: relative; padding-left: 22px; }

.prose ul > li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 8px var(--glow-violet);
}

.prose ol { counter-reset: n; }
.prose ol > li { counter-increment: n; }
.prose ol > li::before {
  content: counter(n);
  position: absolute;
  left: 0;
  top: 0.15em;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.prose code {
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--gold);
  word-break: break-word;
}

.prose pre {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 9, 20, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.75;
}

.prose pre code {
  padding: 0;
  border: 0;
  background: none;
  color: #cfe3ff;
  font-size: 13.5px;
  word-break: normal;
}

/* 极简语法高亮 */
.prose pre .c { color: #5f6b8c; font-style: italic; }
.prose pre .k { color: #a88bfa; }
.prose pre .s { color: #8fe3c0; }
.prose pre .n { color: #ffd9a0; }
.prose pre .p { color: #fb7fc0; }

.prose blockquote {
  position: relative;
  padding: 18px 22px 18px 24px;
  border: 1px solid rgba(99, 228, 245, 0.22);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, rgba(99, 228, 245, 0.09), rgba(99, 228, 245, 0.02));
  color: var(--ink);
  font-size: 15.5px;
}

.prose blockquote p + p { margin-top: 12px; }

.prose hr {
  height: 1px;
  border: 0;
  margin: 46px 0;
  background: linear-gradient(90deg, transparent, var(--line-2), transparent);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.prose thead { background: rgba(255, 255, 255, 0.05); }

.prose th, .prose td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.prose th { color: var(--ink); font-weight: 620; font-size: 13.5px; }
.prose tbody tr:last-child td { border-bottom: 0; }
.prose td { color: var(--ink-2); }

.table-wrap { overflow-x: auto; border-radius: var(--radius); }

/* 文章内目录 */
.toc {
  max-width: var(--reading);
  margin: 34px auto;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.toc__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.toc__title svg { width: 14px; height: 14px; }

.toc ol { display: grid; gap: 4px; counter-reset: t; }

.toc li { counter-increment: t; }

.toc a {
  display: flex;
  gap: 10px;
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--ink-2);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.toc a::before {
  content: "0" counter(t);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  padding-top: 2px;
}
.toc a:hover { color: var(--cyan); background: rgba(255, 255, 255, 0.05); }
.toc a.is-active { color: var(--cyan); }
.toc a.is-active::before { color: var(--cyan); }

/* 文末导航 */
.article__foot {
  max-width: var(--reading);
  margin: 56px auto 0;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.article__foot-note {
  font-size: 13.5px;
  color: var(--ink-3);
}

/* ---------- 13. 404 ---------- */
.notfound {
  display: grid;
  place-items: center;
  min-height: 70vh;
  padding: clamp(120px, 18vh, 180px) 0 80px;
  text-align: center;
}

.notfound__code {
  font-family: var(--font-mono);
  font-size: clamp(64px, 16vw, 140px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.notfound p { margin-top: 16px; color: var(--ink-2); }
.notfound .btn { margin-top: 30px; }

/* ---------- 14. 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 720ms var(--ease), transform 720ms var(--ease);
}

.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__links.is-open {
    display: flex;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    border: 1px solid var(--line-2);
    border-radius: var(--radius);
    background: rgba(9, 12, 26, 0.94);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: 0 24px 50px -24px #000;
  }
  .nav__link { padding: 12px 14px; border-radius: 10px; }
  .nav__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink-2);
  }
  .nav__icon-link--desktop { display: none; }
}

@media (max-width: 640px) {
  .post { grid-template-columns: 1fr; padding: 22px; }
  .post__go { display: none; }
  .section__head { flex-direction: column; align-items: flex-start; gap: 8px; }
  .hero { padding-top: 128px; }
  .hero__br { display: none; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .toc { padding: 18px; }
}

/* ---------- 16. 尊重减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 17. 打印 ---------- */
@media print {
  .bg-canvas, .bg-veil, .bg-grain, .nav, .footer { display: none !important; }
  body { background: #fff; color: #111; }
  .prose, .article__lede { color: #222; }
}