:root {
  --bg: #0a0a0d;
  --bg2: #111116;
  --panel: #14141a;
  --line: rgba(255, 255, 255, .08);
  --line2: rgba(255, 255, 255, .14);
  --ink: #eceae6;
  --ink2: #b9b7bf;
  --mute: #85838d;
  --accent: #ff8a3d;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --w: 1240px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.75 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
code { font-family: var(--mono); font-size: .9em; background: rgba(255, 255, 255, .06); padding: .1em .35em; border-radius: 4px; }
button { font: inherit; color: inherit; }

/* ---------- language ---------- */
:root[data-lang="zh"] .en, :root[data-lang="en"] .zh { display: none !important; }
.lang { position: fixed; top: 10px; right: 16px; z-index: 11; height: 32px; padding: 0 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line2); background: rgba(20, 20, 26, .85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  font-size: 13px; font-weight: 600; color: var(--ink); }
.lang:hover { border-color: var(--ink2); }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 112px 24px 64px; }
.hero::before { content: ""; position: absolute; inset: -30% -10% auto; height: 120%; pointer-events: none;
  background: radial-gradient(40% 50% at 18% 30%, rgba(255, 90, 78, .16), transparent 70%),
              radial-gradient(35% 45% at 80% 20%, rgba(134, 166, 255, .16), transparent 70%),
              radial-gradient(40% 40% at 55% 75%, rgba(245, 183, 48, .10), transparent 70%); }
.hero-in { position: relative; max-width: var(--w); margin: 0 auto; }
.kicker { font-size: 12px; letter-spacing: .32em; color: var(--mute); font-weight: 600; }
.hero h1 { margin: 18px 0 6px; font-size: clamp(40px, 6.4vw, 88px); line-height: 1.08; letter-spacing: -.01em; font-weight: 800; }
.hero .sub { margin: 0; font-size: clamp(18px, 2vw, 24px); color: var(--ink2); }
.hero .lede { max-width: 760px; margin: 28px 0 40px; color: var(--ink2); font-size: 16px; }
.index { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.index a { display: flex; gap: 10px; align-items: baseline; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  text-decoration: none; background: rgba(255, 255, 255, .02); transition: border-color .2s, background .2s; }
.index a:hover { border-color: var(--c); background: color-mix(in srgb, var(--c) 10%, transparent); }
.index b { font: 600 12px var(--mono); color: var(--c); }
.index span { font-size: 14px; }

/* ---------- sticky bar ---------- */
.bar { position: fixed; top: 0; left: 0; right: 0; z-index: 10; display: flex; align-items: center; gap: 16px; height: 52px; padding: 0 92px 0 20px;
  background: rgba(10, 10, 13, .82); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line);
  transform: translateY(-100%); transition: transform .25s; }
.bar.on { transform: none; }
.bar-title { font-weight: 700; text-decoration: none; white-space: nowrap; font-size: 14px; }
.bar-nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.bar-nav::-webkit-scrollbar { display: none; }
.bar-nav a { white-space: nowrap; font-size: 13px; padding: 5px 10px; border-radius: 999px; text-decoration: none; color: var(--mute); }
.bar-nav a:hover { color: var(--ink); }
.bar-nav a.cur { color: #000; background: var(--c); }

/* ---------- film section ---------- */
.film { position: relative; padding: 72px 24px 40px; border-top: 1px solid var(--line); }
.film::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 640px; pointer-events: none;
  background: radial-gradient(50% 60% at 30% 35%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 75%); }
.film-in { position: relative; max-width: var(--w); margin: 0 auto; }
.head { display: flex; align-items: flex-end; gap: 22px; margin-bottom: 26px; flex-wrap: wrap; }
.num { font: 700 15px var(--mono); color: var(--accent); padding-bottom: 10px; }
.head h2 { margin: 0; font-size: clamp(30px, 3.6vw, 46px); line-height: 1.1; font-weight: 800; }
.head .en-sub { font-size: 12px; letter-spacing: .24em; color: var(--mute); font-weight: 600; margin-top: 8px; }
:root[data-lang="en"] .head .en-sub { letter-spacing: .08em; font-size: 13px; }
.head .work { margin-left: auto; text-align: right; color: var(--ink2); font-size: 14px; padding-bottom: 6px; }
.head .work small { display: block; color: var(--mute); font-size: 12px; }

.body { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); gap: 36px; align-items: start; }
.film.portrait .body { grid-template-columns: minmax(0, 400px) minmax(0, 1fr); gap: 56px; }
.player { position: relative; border-radius: 12px; overflow: hidden; background: #000; box-shadow: 0 30px 80px -30px color-mix(in srgb, var(--accent) 45%, transparent), 0 0 0 1px var(--line); }
.player video { display: block; width: 100%; height: auto; aspect-ratio: var(--ar); background: #000; }
.about h4 { margin: 30px 0 10px; font-size: 12px; letter-spacing: .16em; color: var(--accent); font-weight: 600; }
.about h4:first-child { margin-top: 4px; }
.about p { margin: 0; color: var(--ink2); font-size: 16px; line-height: 1.8; }

/* ---------- tabs ---------- */
.tabs { margin-top: 32px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); overflow: hidden; }
.tabbar { display: flex; align-items: center; gap: 4px; padding: 6px 8px; background: var(--bg2); }
.tabs.open .tabbar { border-bottom: 1px solid var(--line); }
.tab { border: 0; background: none; padding: 8px 14px; border-radius: 8px; cursor: pointer; color: var(--mute); font-size: 14px; font-weight: 600; }
.tab:hover { color: var(--ink); }
.tab::after { content: ""; display: inline-block; width: 6px; height: 6px; margin-left: 9px; border: solid currentColor; border-width: 0 1.5px 1.5px 0;
  transform: translateY(-3px) rotate(45deg); transition: transform .2s; opacity: .7; }
.tab[aria-expanded="true"] { color: var(--ink); background: rgba(255, 255, 255, .06); box-shadow: inset 0 -2px 0 var(--accent); }
.tab[aria-expanded="true"]::after { transform: translateY(0) rotate(-135deg); }
.tab small { font-weight: 400; color: var(--mute); margin-left: 4px; }
.tabbar .sp { flex: 1; }
.btn { border: 1px solid var(--line2); background: rgba(255, 255, 255, .03); padding: 6px 12px; border-radius: 8px; cursor: pointer; font-size: 13px;
  color: var(--ink2); text-decoration: none; white-space: nowrap; }
.btn:hover { color: var(--ink); border-color: var(--accent); }
.btn.ok { color: #000; background: var(--accent); border-color: var(--accent); }
.pane[hidden], .btn[hidden] { display: none; }

.steps { margin: 0; padding: 16px 20px 16px 40px; border-bottom: 1px solid var(--line); color: var(--ink2); font-size: 14px; }
.pnote { margin: 0; padding: 12px 24px; border-bottom: 1px solid var(--line); color: var(--mute); font-size: 13px; }
.steps li { margin: 2px 0; }
.prompt { margin: 0; padding: 20px 24px; max-height: 620px; overflow: auto; font: 13px/1.65 var(--mono); white-space: pre-wrap; word-break: break-word; color: #d9d6cf; }
.prompt .h { color: var(--accent); font-weight: 700; }

/* ---------- source viewer ---------- */
.src { display: grid; grid-template-columns: 250px minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); height: 640px; }
.tree { border-right: 1px solid var(--line); overflow: auto; padding: 10px 0; font-size: 13px; }
.tree .dir { padding: 10px 16px 4px; color: var(--mute); font: 600 11.5px var(--mono); }
.tree button { display: flex; width: 100%; gap: 8px; align-items: baseline; border: 0; background: none; text-align: left; cursor: pointer; padding: 4px 16px;
  color: var(--ink2); font: 12.5px var(--mono); }
.tree button.sub { padding-left: 28px; }
.tree button:hover { background: rgba(255, 255, 255, .04); color: var(--ink); }
.tree button.cur { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--ink); }
.tree button span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree button i { font-style: normal; color: var(--mute); font-size: 11px; }
.view { display: flex; flex-direction: column; min-width: 0; min-height: 0; overflow: hidden; }
.vbar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--line); font: 12.5px var(--mono); color: var(--ink2); }
.vbar .p { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.vbar .s { color: var(--mute); }
.vbody { flex: 1; min-height: 0; overflow: auto; position: relative; }
.code { display: flex; min-width: max-content; font: 12.5px/1.6 var(--mono); }
.code pre { margin: 0; padding: 14px 0; }
.gut { position: sticky; left: 0; padding: 14px 12px 14px 16px !important; text-align: right; color: #55535c; background: var(--panel); user-select: none; border-right: 1px solid var(--line); }
.code code { display: block; padding: 0 24px 0 16px; background: none; font-size: inherit; white-space: pre; color: #d9d6cf; }
.media { display: grid; place-items: center; min-height: 100%; padding: 24px;
  background: repeating-conic-gradient(#1b1b21 0 25%, #15151a 0 50%) 0 0 / 20px 20px; }
.media img { max-width: 100%; max-height: 560px; }
.note { padding: 28px; color: var(--mute); font-size: 14px; }
.deps { padding: 14px 20px; border-top: 1px solid var(--line); font-size: 13px; color: var(--mute); display: grid; gap: 4px; }
.deps b { color: var(--ink2); font-weight: 600; margin-right: 6px; }
.deps code { font-size: 12px; }

/* highlight.js tokens */
.hljs-comment, .hljs-quote { color: #6f6d78; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-built_in, .hljs-meta .hljs-keyword { color: #ff9e80; }
.hljs-string, .hljs-regexp, .hljs-addition, .hljs-meta .hljs-string { color: #b5d98a; }
.hljs-number, .hljs-literal, .hljs-symbol, .hljs-bullet { color: #f5c26b; }
.hljs-title, .hljs-title.function_, .hljs-section { color: #8fc1ff; }
.hljs-title.class_, .hljs-type, .hljs-class .hljs-title { color: #e6b3ff; }
.hljs-attr, .hljs-attribute, .hljs-variable, .hljs-template-variable, .hljs-property { color: #8fd8d0; }
.hljs-tag, .hljs-name { color: #ff8fa3; }
.hljs-params { color: #d9d6cf; }
.hljs-meta { color: #a3a1ad; }
.hljs-deletion { color: #ff7b7b; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); padding: 64px 24px 80px; background: var(--bg2); }
.foot-in { max-width: var(--w); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.foot h3 { margin: 0 0 14px; font-size: 18px; }
.foot ol { margin: 0; padding-left: 20px; color: var(--ink2); }
.foot li { margin: 6px 0; }
.foot p { color: var(--ink2); }
.cmd { margin: 0 0 14px; padding: 16px 18px; border-radius: 10px; background: var(--panel); border: 1px solid var(--line); overflow-x: auto; font: 12.5px/1.7 var(--mono); color: #d9d6cf; }
.cmd .c { color: #6f6d78; }
.noscript { max-width: var(--w); margin: 40px auto; padding: 0 24px; color: var(--ink2); }

/* ---------- small screens ---------- */
@media (max-width: 1000px) {
  .index { grid-template-columns: repeat(3, 1fr); }
  .body, .film.portrait .body { grid-template-columns: 1fr; }
  .film.portrait .player { max-width: 420px; }
  .foot-in { grid-template-columns: 1fr; }
  .head .work { margin-left: 0; text-align: left; width: 100%; }
}
@media (max-width: 720px) {
  .hero { padding-top: 80px; }
  .index { grid-template-columns: repeat(2, 1fr); }
  .src { grid-template-columns: 1fr; grid-template-rows: 170px minmax(0, 1fr); height: 720px; }
  .tree { border-right: 0; border-bottom: 1px solid var(--line); }
  .tabbar { flex-wrap: wrap; }
  .bar-title { display: none; }
}
:root[data-lang="en"] .about h4 { text-transform: uppercase; letter-spacing: .14em; font-size: 11.5px; }