/* ============================================================
   xi-hub · 全站样式（无构建、无依赖，直接改这个文件即可）
   设计语言：暗色 + 单色高对比 + 故障艺术点缀
   ============================================================ */

:root {
  /* 色彩 */
  --bg: #08080a;
  --bg-soft: #0e0e12;
  --fg: #e9e9ec;
  --fg-dim: #a1a1ac;
  --fg-mute: #84848f;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --accent: #00f5a0;
  --accent-2: #7c5cff;
  --hot: #ff2e5b;

  /* 字体 */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo,
    Consolas, monospace;

  /* 排版尺度 */
  --step-0: clamp(0.95rem, 0.9rem + 0.2vw, 1.05rem);
  --step-1: clamp(1.15rem, 1rem + 0.6vw, 1.5rem);
  --step-2: clamp(1.5rem, 1.2rem + 1.4vw, 2.4rem);
  --step-3: clamp(2.1rem, 1.4rem + 3.2vw, 4.2rem);
  --step-4: clamp(2.8rem, 1.2rem + 7vw, 7rem);

  /* 节奏 */
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --maxw: 1120px;
  --radius: 14px;

  /* 动效 token —— 所有动画参数集中在这里 */
  --dur-fast: 160ms;
  --dur-base: 320ms;
  --dur-slow: 720ms;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --glitch-shift: 2px;
}

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

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 桌面端隐藏系统光标，启用自定义光标 */
@media (hover: hover) and (pointer: fine) {
  body.has-cursor,
  body.has-cursor a,
  body.has-cursor button {
    cursor: none;
  }
}

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

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

::selection {
  background: var(--accent);
  color: #04130d;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 布局工具 ---------- */

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(4rem, 9vw, 8rem);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #04130d;
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

/* ---------- 排版 ---------- */

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

h1 {
  font-size: var(--step-4);
}
h2 {
  font-size: var(--step-3);
}
h3 {
  font-size: var(--step-2);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
}
.eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.lede {
  font-size: var(--step-1);
  color: var(--fg-dim);
  max-width: 46ch;
  text-wrap: pretty;
}

.muted {
  color: var(--fg-dim);
}

/* ---------- 全站肌理 ---------- */

.noise {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.045;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

.scanlines {
  position: fixed;
  inset: 0;
  z-index: 59;
  pointer-events: none;
  opacity: 0.22;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 3px,
    rgba(0, 0, 0, 0.32) 3px 4px
  );
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 70;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 故障文字 ---------- */

.glitch {
  position: relative;
  display: inline-block;
  isolation: isolate;
}

.glitch__base {
  position: relative;
}

.glitch__layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.9;
  z-index: 1;
}

.glitch__layer--r {
  color: var(--hot);
  animation: glitch-r 4.2s infinite steps(1);
}
.glitch__layer--c {
  color: #00e5ff;
  animation: glitch-c 4.2s infinite steps(1);
}

@keyframes glitch-r {
  0%, 92%, 100% { transform: none; clip-path: inset(0 0 100% 0); }
  93% { transform: translate(calc(var(--glitch-shift) * -1), -1px); clip-path: inset(12% 0 62% 0); }
  95% { transform: translate(var(--glitch-shift), 1px); clip-path: inset(58% 0 22% 0); }
  97% { transform: translate(calc(var(--glitch-shift) * -0.6), 0); clip-path: inset(30% 0 45% 0); }
}

@keyframes glitch-c {
  0%, 92%, 100% { transform: none; clip-path: inset(0 0 100% 0); }
  93% { transform: translate(var(--glitch-shift), 1px); clip-path: inset(42% 0 36% 0); }
  96% { transform: translate(calc(var(--glitch-shift) * -1), -1px); clip-path: inset(8% 0 74% 0); }
  98% { transform: translate(calc(var(--glitch-shift) * 0.5), 0); clip-path: inset(66% 0 12% 0); }
}

/* ---------- 滚动揭示 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-slow) var(--ease),
    transform var(--dur-slow) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

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

.no-js [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------- 自定义光标 ---------- */

.cursor {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  pointer-events: none;
  mix-blend-mode: difference;
  will-change: transform;
}

.cursor__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg);
  transform: translate(-50%, -50%);
}

.cursor__ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(233, 233, 236, 0.5);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0.6);
  transition:
    transform var(--dur-base) var(--ease),
    opacity var(--dur-base) var(--ease);
  opacity: 0.5;
}

.cursor.is-hot .cursor__ring {
  transform: translate(-50%, -50%) scale(1.4);
  opacity: 1;
}

@media (hover: none), (pointer: coarse) {
  .cursor {
    display: none;
  }
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: transparent;
  transition:
    border-color var(--dur-base) var(--ease),
    color var(--dur-base) var(--ease);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: translateY(101%);
  transition: transform var(--dur-base) var(--ease);
  z-index: -1;
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--accent);
  color: #04130d;
}

.btn:hover::before,
.btn:focus-visible::before {
  transform: none;
}

.btn--solid {
  background: var(--accent);
  color: #04130d;
  border-color: var(--accent);
}

.btn--solid::before {
  background: var(--fg);
}

/* ---------- 页头 ---------- */

.site-head {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(8, 8, 10, 0.72);
  border-bottom: 1px solid var(--line);
}

.site-head__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 64px;
}

.brand {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand__mark {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  animation: pulse 3.2s var(--ease) infinite;
}

.brand__dim {
  color: var(--fg-mute);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.nav {
  display: flex;
  gap: clamp(0.9rem, 2.5vw, 1.9rem);
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.nav a {
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease);
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur-base) var(--ease);
}

.nav a:hover,
.nav a:focus-visible,
.nav a[aria-current="page"] {
  color: var(--fg);
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

@media (max-width: 480px) {
  .nav {
    font-size: 0.76rem;
    gap: 0.85rem;
  }
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: min(92svh, 860px);
  display: flex;
  align-items: center;
  padding-block: clamp(6rem, 14vh, 9rem) clamp(4rem, 10vh, 7rem);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* WebGL 不可用时显示的静态渐变，视觉上尽量接近 shader 第一帧 */
.hero__fallback {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(90% 70% at 22% 18%, rgba(0, 245, 160, 0.18), transparent 62%),
    radial-gradient(80% 60% at 78% 42%, rgba(124, 92, 255, 0.22), transparent 60%),
    linear-gradient(180deg, #0b0b10 0%, #08080a 70%);
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.92;
}

.hero__canvas[data-disabled="true"] {
  display: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__title {
  margin: 1.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.08em;
}

.hero__line {
  display: block;
}

.hero__title .glitch {
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.hero__status {
  margin-top: 1.75rem;
  font-size: 0.78rem;
  color: var(--fg-mute);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.hero__pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: ping 2.4s var(--ease) infinite;
}

@keyframes ping {
  0% { box-shadow: 0 0 0 0 rgba(0, 245, 160, 0.55); }
  70% { box-shadow: 0 0 0 10px rgba(0, 245, 160, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 245, 160, 0); }
}

/* ---------- 区块标题 ---------- */

.sec-head {
  margin-bottom: clamp(2rem, 6vw, 3.5rem);
}

.sec-head h2 {
  margin: 0.75rem 0 0;
  font-size: var(--step-3);
}

.sec-head .lede {
  margin-top: 1rem;
  font-size: var(--step-1);
}

/* ---------- 作品卡片 ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.card {
  --card-glow: rgba(0, 245, 160, 0.16);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.028), rgba(255, 255, 255, 0));
  transition:
    transform var(--dur-base) var(--ease),
    border-color var(--dur-base) var(--ease),
    background var(--dur-base) var(--ease);
  overflow: hidden;
}

.card--featured {
  --card-glow: rgba(124, 92, 255, 0.2);
}

.card:hover,
.card:focus-within {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0));
}

.card__link {
  display: block;
  height: 100%;
}

/* 程序化生成的视觉块：不依赖任何图片素材 */
.card__visual {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background:
    radial-gradient(100% 80% at 15% 10%, var(--card-glow), transparent 60%),
    linear-gradient(140deg, #101018 0%, #0a0a0f 100%);
  border-bottom: 1px solid var(--line);
}

.card__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.5;
  transition: transform var(--dur-slow) var(--ease);
}

.card:hover .card__grid {
  transform: translate3d(-8px, -8px, 0);
}

.card__index {
  position: absolute;
  right: 0.9rem;
  bottom: -0.35rem;
  font-size: clamp(3.2rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.16);
}

.card__badge {
  position: absolute;
  left: 0.9rem;
  top: 0.85rem;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--fg-dim);
  background: rgba(8, 8, 10, 0.6);
}

.card__body {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  height: 100%;
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.card__title {
  position: relative;
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: -0.01em;
  isolation: isolate;
  margin: 0;
}

/* 默认完全裁掉，只在 hover 时短暂露出，避免常态干扰阅读 */
.card__ghost {
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}

.card:hover .card__ghost {
  opacity: 0.85;
  animation: glitch-r 900ms steps(1) 1;
}

.card:hover .card__ghost--c {
  animation-name: glitch-c;
}

.card__year {
  font-size: 0.75rem;
  color: var(--fg-mute);
  flex-shrink: 0;
}

.card__summary {
  margin: 0;
  color: var(--fg-dim);
  font-size: 0.95rem;
  line-height: 1.65;
}

.card__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.7rem;
}

.card__stack li {
  padding: 0.18rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--fg-mute);
}

.card__metrics {
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding-top: 0.35rem;
  border-top: 1px dashed var(--line);
}

.card__metrics dt {
  font-size: 0.68rem;
  color: var(--fg-mute);
}

.card__metrics dd {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
  color: var(--accent);
}

.card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  padding-top: 0.5rem;
  font-size: 0.72rem;
}

.chip {
  padding: 0.16rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--fg-dim);
}

.chip--live {
  border-color: rgba(0, 245, 160, 0.4);
  color: var(--accent);
}

.chip--wip {
  border-color: rgba(124, 92, 255, 0.45);
  color: #b3a0ff;
}

.card__go {
  color: var(--fg-mute);
  transition: color var(--dur-fast) var(--ease);
}

.card:hover .card__go {
  color: var(--fg);
}

/* ---------- 能力轴 ---------- */

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
}

.skills__label {
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.1rem;
  font-family: var(--font-mono);
  font-weight: 500;
}

.skills__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.skill {
  display: grid;
  gap: 0.4rem;
}

.skill__name {
  font-size: 0.88rem;
}

.skill__bar {
  display: block;
  height: 2px;
  background: var(--line);
  overflow: hidden;
}

.skill__fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 1100ms var(--ease);
}

.skills__group.is-in .skill__fill {
  width: var(--v);
}

/* ---------- 时间线 ---------- */

.tl__title {
  margin: 0.75rem 0 clamp(2rem, 5vw, 3.5rem);
  font-size: var(--step-2);
}

.tl {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.tl__item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  padding-block: clamp(1.5rem, 4vw, 2.25rem);
  border-bottom: 1px solid var(--line);
}

.tl__rail {
  position: relative;
  color: var(--accent);
  display: flex;
  justify-content: center;
}

.tl__rail svg {
  width: 2px;
  height: 100%;
  overflow: visible;
}

/* pathLength=1 让「按进度绘制」变成纯 CSS 过渡，不需要 JS 算长度 */
.tl__line {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 900ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

.tl__item.is-in .tl__line {
  stroke-dashoffset: 0;
}

.tl__dot {
  position: absolute;
  top: 0.55rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--accent);
  transform: scale(0.4);
  opacity: 0;
  transition:
    transform 500ms var(--ease),
    opacity 400ms var(--ease);
  transition-delay: calc(var(--reveal-delay, 0ms) + 260ms);
}

.tl__item.is-in .tl__dot {
  transform: scale(1);
  opacity: 1;
  box-shadow: 0 0 12px rgba(0, 245, 160, 0.5);
}

.tl__year {
  font-size: 0.75rem;
  color: var(--fg-mute);
  letter-spacing: 0.12em;
}

.tl__h {
  font-size: var(--step-1);
  margin: 0.35rem 0 0.5rem;
  font-weight: 600;
}

.tl__text {
  margin: 0;
  color: var(--fg-dim);
  max-width: 52ch;
}

@media (max-width: 560px) {
  .tl__item {
    grid-template-columns: 16px 1fr;
  }
}

/* ---------- 关于 ---------- */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 4rem);
  align-items: start;
}

.about h2 {
  margin-top: 0.75rem;
  font-size: var(--step-2);
}

.about__list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 54ch;
}

.about__list li {
  color: var(--fg-dim);
}

.about__list strong {
  color: var(--fg);
  font-weight: 600;
  display: block;
}

.about__card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0));
}

.about__row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

.about__row .mono {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.about__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

@media (max-width: 820px) {
  .about {
    grid-template-columns: 1fr;
  }
}

/* ---------- 页脚 ---------- */

.site-foot {
  border-top: 1px solid var(--line);
  padding-block: 2.5rem 3.5rem;
  margin-top: clamp(3rem, 8vw, 6rem);
}

.site-foot__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: center;
}

.site-foot__meta,
.site-foot__links {
  font-size: 0.78rem;
  color: var(--fg-mute);
}

.site-foot__links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-foot__links a {
  transition: color var(--dur-fast) var(--ease);
}

.site-foot__links a:hover {
  color: var(--accent);
}

/* ---------- 项目详情页 ---------- */

.case {
  padding-top: clamp(6rem, 14vh, 8rem);
}

.back {
  font-size: 0.78rem;
  color: var(--fg-mute);
  transition: color var(--dur-fast) var(--ease);
}

.back:hover {
  color: var(--accent);
}

.case__head {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.case__title {
  margin: 1rem 0 0;
  font-size: var(--step-3);
}

.case__head .lede {
  margin-top: 1.25rem;
}

.case__cover {
  margin-top: clamp(2rem, 5vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #0b0b10;
}

.case__cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.case__metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
  gap: 1rem;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 1.25rem 0;
  border-block: 1px solid var(--line);
}

.case__metrics dt {
  font-size: 0.72rem;
  color: var(--fg-mute);
}

.case__metrics dd {
  margin: 0.3rem 0 0;
  font-size: 1.15rem;
  color: var(--accent);
}

.case__meta {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.75rem;
  font-size: 0.8rem;
}

.case__meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.case__meta-row .muted {
  min-width: 4.5rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tags li {
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--fg-dim);
}

.case__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

/* ---------- 正文排版 ---------- */

.prose {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  max-width: 68ch;
  font-size: 1.02rem;
  color: #d6d6dd;
}

.prose h2 {
  font-size: var(--step-2);
  margin: clamp(2.5rem, 6vw, 3.5rem) 0 1rem;
  padding-top: 0.5rem;
}

.prose h3 {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
}

.prose p {
  margin: 0 0 1.15rem;
}

.prose strong {
  color: var(--fg);
  font-weight: 600;
}

.prose ul,
.prose ol {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  color: var(--fg-dim);
}

.prose pre {
  margin: 1.5rem 0;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  background: #0d0d13;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 0.85rem;
  line-height: 1.6;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.prose p code,
.prose li code {
  padding: 0.1rem 0.35rem;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 4px;
  color: var(--accent);
}

.prose pre code {
  color: #cfd3e0;
  background: none;
  padding: 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

/* ---------- 上下篇 ---------- */

.case__nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--line);
  margin-top: clamp(3rem, 8vw, 5rem);
}

.case__nav a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.95rem;
  max-width: 45%;
  transition: color var(--dur-fast) var(--ease);
}

.case__nav a:hover {
  color: var(--accent);
}

.case__nav-next {
  text-align: right;
  align-items: flex-end;
  margin-left: auto;
}

.case__nav .mono {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
}

/* ---------- Lab ---------- */

.lab {
  padding-top: clamp(6rem, 14vh, 8rem);
}

.lab__head h2 {
  margin: 0.75rem 0 0;
  font-size: var(--step-3);
}

.lab__head .lede {
  margin-top: 1rem;
}

.demo {
  margin: clamp(2.5rem, 6vw, 4rem) 0;
}

.demo__stage {
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.demo__fallback {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(70% 60% at 30% 25%, rgba(0, 245, 160, 0.18), transparent 60%),
    radial-gradient(60% 55% at 72% 60%, rgba(124, 92, 255, 0.24), transparent 60%),
    linear-gradient(140deg, #101018, #0a0a0f);
}

.demo__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.demo__canvas[data-disabled="true"] {
  display: none;
}

.demo__cap {
  margin-top: 0.85rem;
  font-size: 0.72rem;
  color: var(--fg-mute);
}

.lab__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.lab__item {
  padding-block: clamp(1.5rem, 4vw, 2.25rem);
  border-bottom: 1px solid var(--line);
}

.lab__item-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.lab__item-head h3 {
  font-size: var(--step-1);
  font-weight: 600;
}

.lab__summary {
  margin: 0.6rem 0 0;
  color: var(--fg-dim);
  max-width: 58ch;
}

.lab__note {
  margin: 0.7rem 0 0;
  font-size: 0.74rem;
  color: var(--accent);
}

.lab__item .tags {
  margin-top: 0.9rem;
  font-size: 0.7rem;
}

.lab__item .tags li {
  color: var(--fg-mute);
}

/* ---------- 404 ---------- */

.nf {
  min-height: 70svh;
  display: flex;
  align-items: center;
  padding-top: clamp(6rem, 14vh, 8rem);
}

.nf__code {
  margin: 1rem 0;
  font-size: clamp(5rem, 20vw, 12rem);
  line-height: 1;
  font-family: var(--font-mono);
}

.nf__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* ---------- 无障碍：减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .glitch__layer,
  .card__ghost {
    display: none;
  }

  .noise,
  .scanlines,
  .cursor {
    display: none;
  }

  .card:hover {
    transform: none;
  }

  .tl__line {
    stroke-dashoffset: 0;
  }

  .tl__dot {
    opacity: 1;
    transform: none;
  }
}