@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

:root {
  --neon: #87ff71;
  --cyan: #01cdfe;
  --pink: #ff71ce;
  --violet: #b967ff;
  --ink: #192617;
  --ink-deep: #0e1912;
  --r: 18px;
  --text: #dff3e4;
  --muted: #9dbfa7;
  --line: rgba(135, 255, 113, .24);
  --glass: rgba(21, 34, 24, .72);
  --edge: rgba(1, 205, 254, .28);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  overflow-x: clip;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Space Mono", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", ui-monospace, monospace;
  font-size: 17px;
  line-height: 1.72;
  color: var(--text);
  background: var(--ink-deep);
  overflow-x: clip;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 55% at 50% -8%, rgba(255, 113, 206, .34), transparent 62%),
    radial-gradient(90% 45% at 88% 2%, rgba(1, 205, 254, .26), transparent 58%),
    linear-gradient(180deg, #24321f 0%, #16221a 40%, var(--ink-deep) 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .3;
  background: repeating-linear-gradient(180deg, rgba(0, 0, 0, 0) 0 2px, rgba(0, 0, 0, .32) 2px 4px);
}

a { color: var(--cyan); }

img { max-width: 100%; }

.shell {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr);
  gap: 26px;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 24px 0 0;
}

/* 左侧竖排导航 */
.rail {
  position: sticky;
  top: 16px;
  align-self: start;
  height: calc(100vh - 32px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 16px 24px;
  border: 1px solid var(--line);
  border-left: 0;
  border-radius: 0 var(--r) var(--r) 0;
  background: linear-gradient(180deg, rgba(30, 46, 32, .88), rgba(14, 25, 18, .92));
  backdrop-filter: blur(12px);
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  min-height: 46px;
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  color: #f2fff4;
  text-shadow: 0 0 12px rgba(135, 255, 113, .7), 0 0 32px rgba(1, 205, 254, .35);
}

.find input {
  width: 100%;
  min-height: 42px;
  padding: 9px 12px;
  font: inherit;
  font-size: .9rem;
  color: var(--text);
  background: rgba(1, 205, 254, .08);
  border: 1px solid var(--edge);
  border-radius: 12px;
  outline: none;
}

.find input:focus {
  border-color: var(--neon);
  box-shadow: 0 0 0 3px rgba(135, 255, 113, .16);
}

.find input::placeholder { color: rgba(157, 191, 167, .85); }

.menu {
  list-style: none;
  display: grid;
  gap: 3px;
  margin: 0;
  padding: 0;
}

.menu li.is-out { display: none; }

.menu a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 7px 10px;
  font-size: .93rem;
  line-height: 1.4;
  color: var(--text);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 12px;
}

.menu .num {
  flex: 0 0 auto;
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--cyan);
  opacity: .85;
}

.menu a:hover,
.menu a:focus-visible {
  color: #f4fff6;
  background: linear-gradient(90deg, rgba(1, 205, 254, .16), rgba(135, 255, 113, .1));
  border-color: var(--edge);
}

.col { min-width: 0; }

main { padding-top: 20px; }

/* 首屏 */
.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 70vh;
  margin: 0 0 24px;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #16221a;
  isolation: isolate;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(25, 38, 23, .55), rgba(25, 38, 23, .18) 40%, rgba(14, 25, 18, .95) 96%),
    radial-gradient(70% 60% at 12% 96%, rgba(255, 113, 206, .26), transparent 70%);
}

.hero-fig {
  position: absolute;
  inset: -6% 0;
  z-index: 0;
  margin: 0;
  transform: scale(1.06);
  will-change: transform;
}

.hero-fig .hero-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.15) contrast(1.05);
}

.hero-grid {
  position: absolute;
  inset: 0;
  display: block;
  background:
    linear-gradient(rgba(1, 205, 254, .26) 1px, transparent 1px) 0 0 / 52px 52px,
    linear-gradient(90deg, rgba(255, 113, 206, .2) 1px, transparent 1px) 0 0 / 52px 52px,
    radial-gradient(95% 80% at 50% 112%, rgba(185, 103, 255, .62), transparent 62%),
    linear-gradient(160deg, #2c3d26, #101b13 70%);
}

.hero-copy {
  position: relative;
  z-index: 3;
  max-width: 40rem;
  padding: 0 26px 42px;
}

.glitch {
  position: relative;
  margin: 0 0 14px;
  font-size: clamp(1.95rem, 5.6vw, 3.5rem);
  line-height: 1.16;
  letter-spacing: .01em;
  color: #f4fff6;
  text-shadow: 0 0 14px rgba(135, 255, 113, .65), 0 0 46px rgba(1, 205, 254, .35);
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  pointer-events: none;
  mix-blend-mode: screen;
}

.glitch::before {
  color: var(--pink);
  opacity: .7;
  transform: translate(-2px, -2px);
  animation: shift-a 5.5s infinite steps(1);
}

.glitch::after {
  color: var(--cyan);
  opacity: .62;
  transform: translate(2px, 2px);
  animation: shift-b 6.5s infinite steps(1);
}

@keyframes shift-a {
  0%, 90%, 100% { transform: translate(-2px, -2px); }
  93% { transform: translate(-7px, -3px); }
  96% { transform: translate(3px, -5px); }
}

@keyframes shift-b {
  0%, 88%, 100% { transform: translate(2px, 2px); }
  92% { transform: translate(6px, 3px); }
  95% { transform: translate(-4px, 4px); }
}

.lede {
  margin: 0;
  max-width: 34rem;
  font-size: 1rem;
  color: #cfe8d6;
}

/* 正文与侧栏 */
.paper {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: 22px;
  align-items: start;
  padding-bottom: 8px;
}

.prose { min-width: 0; }

.prose > article {
  position: relative;
  margin: 0 0 20px;
  padding: 24px 22px 26px;
  scroll-margin-top: 24px;
  background: linear-gradient(160deg, rgba(29, 45, 32, .86), rgba(15, 27, 19, .93));
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  border-radius: var(--r);
  backdrop-filter: blur(6px);
  box-shadow: 0 18px 40px -30px rgba(1, 205, 254, .8);
}

.prose > article.pre {
  opacity: 0;
  transform: translateY(16px);
}

.prose > article.in {
  opacity: 1;
  transform: none;
  transition: opacity .5s ease, transform .5s ease;
}

.prose > article::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  opacity: .7;
}

.prose h1,
.prose h2,
.prose h3 {
  line-height: 1.35;
  color: #eaffef;
}

.prose h2 {
  margin: .1em 0 .7em;
  font-size: 1.34rem;
  text-shadow: 0 0 20px rgba(135, 255, 113, .45);
}

.prose h3 {
  margin: 1.3em 0 .5em;
  font-size: 1.1rem;
  color: var(--neon);
}

.prose h2 > span,
.prose h3 > span {
  border-bottom: 2px solid rgba(1, 205, 254, .55);
  padding-bottom: 2px;
}

.prose p { margin: 0 0 1em; }

.prose ul,
.prose ol {
  margin: 0 0 1em;
  padding-left: 1.3em;
}

.prose li { margin: .3em 0; }

.prose a {
  color: var(--cyan);
  text-decoration-color: rgba(1, 205, 254, .45);
  text-underline-offset: 3px;
}

.prose strong { color: var(--neon); }

.prose blockquote {
  margin: 1em 0;
  padding: 10px 16px;
  border-left: 3px solid var(--pink);
  background: rgba(255, 113, 206, .08);
  border-radius: 0 12px 12px 0;
}

.prose figure { margin: 1em 0; }

.prose img {
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--edge);
}

.prose hr {
  border: 0;
  height: 1px;
  margin: 1.4em 0;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}

.side {
  position: sticky;
  top: 22px;
  align-self: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--glass);
  backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05);
}

.side h2 {
  margin: 0 0 10px;
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--neon);
}

.side h2 > span { border-bottom: 1px solid rgba(135, 255, 113, .5); padding-bottom: 3px; }

.side h2 + * { margin-top: 0; }

.side h2:not(:first-child) {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed rgba(135, 255, 113, .22);
}

.jump {
  list-style: none;
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
}

.jump a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 5px 8px;
  font-size: .88rem;
  line-height: 1.4;
  color: var(--text);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 10px;
}

.jump a:hover,
.jump a:focus-visible {
  color: #fff;
  background: rgba(1, 205, 254, .14);
  border-color: var(--edge);
}

.side-top { margin: 0; }

.side-top a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 5px 12px;
  font-size: .88rem;
  color: var(--ink);
  text-decoration: none;
  border-radius: 12px;
  background: linear-gradient(120deg, var(--neon), var(--cyan));
  font-weight: 700;
}

/* 页脚 */
.foot {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 20px;
  margin-top: 26px;
  padding: 24px 22px 44px;
  border-top: 1px solid var(--line);
  font-size: .84rem;
  color: var(--muted);
}

.foot p { margin: 0; }

.foot-brand {
  font-weight: 700;
  color: #e7fbea;
  text-shadow: 0 0 14px rgba(135, 255, 113, .4);
}

.foot-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 14px;
  justify-content: flex-end;
}

.foot-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--cyan);
  text-decoration: none;
}

.foot-nav a:hover { color: var(--neon); }

.foot small {
  grid-column: 1 / -1;
  font-size: .76rem;
  color: rgba(157, 191, 167, .8);
}

@media (max-width: 900px) {
  .shell {
    display: block;
    padding: 0;
  }

  .rail {
    position: sticky;
    top: 0;
    z-index: 30;
    height: auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 10px;
    padding: 10px 14px 8px;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0 0 var(--r) var(--r);
  }

  .rail .brand {
    flex: 1 1 auto;
    min-height: 42px;
  }

  .find {
    flex: 0 1 150px;
    min-width: 118px;
  }

  .find input { min-height: 40px; padding: 7px 10px; }

  .menu {
    order: 3;
    flex: 1 0 100%;
    display: flex;
    gap: 8px;
    padding-bottom: 4px;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .menu li { flex: 0 0 auto; }

  .menu a {
    min-height: 42px;
    padding: 8px 12px;
    font-size: .88rem;
    border-color: rgba(135, 255, 113, .18);
    background: rgba(25, 38, 23, .7);
  }

  main { padding: 16px 16px 0; }

  .hero { min-height: 60vh; }

  .hero-copy { padding: 0 18px 30px; }

  .paper {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .side {
    position: static;
    order: 2;
  }

  .jump { grid-template-columns: 1fr 1fr; }

  .prose > article { padding: 20px 16px 22px; }

  .prose > article,
  #start { scroll-margin-top: 150px; }

  .foot {
    grid-template-columns: 1fr;
    padding: 20px 16px 40px;
  }

  .foot-nav { justify-content: flex-start; }
}

@media (max-width: 420px) {
  body { font-size: 16px; }

  .jump { grid-template-columns: 1fr; }

  .lede { font-size: .95rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .glitch::before,
  .glitch::after { animation: none; }

  .hero-fig { transform: none; }

  .prose > article.pre {
    opacity: 1;
    transform: none;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}