/* sluna.xyz — designed & built by Claude Opus 5.5 */

@font-face { font-family: "Instrument Serif"; src: url(../fonts/instrument-serif.woff2) format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Instrument Serif"; src: url(../fonts/instrument-serif-italic.woff2) format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Inter"; src: url(../fonts/inter.woff2) format("woff2"); font-weight: 300 600; font-style: normal; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url(../fonts/jetbrains-mono.woff2) format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }

:root {
  --bg: #0b0a09;
  --fg: #f3ede4;
  --fg-2: rgba(243, 237, 228, .62);
  --fg-3: rgba(243, 237, 228, .36);
  --line: rgba(243, 237, 228, .09);
  --clay: #d97757;
  --clay-soft: #e8a184;
  --serif: "Instrument Serif", "Songti SC", "Noto Serif SC", Georgia, serif;
  --sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --pad: clamp(20px, 5vw, 80px);
  --ease: cubic-bezier(.16, 1, .3, 1);
  --ease-io: cubic-bezier(.77, 0, .175, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-weight: 300; font-size: 16px; line-height: 1.7;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
body.is-loading { overflow: hidden; }
a { color: inherit; text-decoration: none; }
em { font-style: italic; }
.mono { font-family: var(--mono); font-weight: 400; }
::selection { background: var(--clay); color: #0b0a09; }

/* ---------- layers ---------- */
#gl { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 0; display: block; }
.fallback-glow { display: none; position: fixed; inset: 0; z-index: 0;
  background: radial-gradient(40vmax 40vmax at 70% 40%, rgba(217,119,87,.28), transparent 60%),
              radial-gradient(30vmax 30vmax at 20% 80%, rgba(232,161,132,.10), transparent 60%); }
.no-webgl .fallback-glow { display: block; }
.no-webgl #gl { display: none; }
.vignette { position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: radial-gradient(120% 90% at 50% 45%, transparent 55%, rgba(0,0,0,.65) 100%); }
.grain { position: fixed; inset: -50%; z-index: 60; pointer-events: none; opacity: .07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 1s steps(6) infinite; }
@keyframes grain {
  0% { transform: translate(0, 0); } 20% { transform: translate(-4%, 3%); } 40% { transform: translate(3%, -2%); }
  60% { transform: translate(-2%, -4%); } 80% { transform: translate(4%, 2%); } 100% { transform: translate(0, 0); }
}
main, .footer { position: relative; z-index: 2; }

/* letterbox for film */
.letterbox { position: fixed; left: 0; right: 0; height: 0; background: #000; z-index: 40; pointer-events: none;
  transition: height 1s var(--ease-io); }
.letterbox.top { top: 0; } .letterbox.bottom { bottom: 0; }
.film-on .letterbox { height: 7vh; }

/* ---------- loader ---------- */
.loader { position: fixed; inset: 0; z-index: 100; background: var(--bg); display: grid; place-items: center;
  transition: clip-path 1.2s var(--ease-io), visibility 0s 1.2s; clip-path: inset(0 0 0 0); }
.is-ready .loader { clip-path: inset(0 0 100% 0); visibility: hidden; }
.loader-inner { width: min(320px, 70vw); text-align: center; }
.loader-spark { width: 44px; height: 44px; color: var(--clay); animation: spin 6s linear infinite; margin-bottom: 28px; }
.loader-text { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--fg-3); margin-bottom: 12px; }
.loader-num { color: var(--fg); }
.loader-bar { height: 1px; background: var(--line); overflow: hidden; }
.loader-bar i { display: block; height: 100%; width: 100%; background: var(--clay); transform: scaleX(0); transform-origin: left; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- nav ---------- */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between;
  padding: 22px var(--pad); transition: transform .8s var(--ease), background .5s, padding .5s; }
.nav.scrolled { background: linear-gradient(to bottom, rgba(11,10,9,.75), rgba(11,10,9,0)); }
.film-on .nav { transform: translateY(-120%); }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-size: 22px; letter-spacing: .01em; }
.brand svg { width: 22px; height: 22px; color: var(--clay); transition: transform 1.2s var(--ease); }
.brand:hover svg { transform: rotate(180deg); }
.brand em { color: var(--clay-soft); }
.nav-links { display: flex; gap: 6px; padding: 6px; border: 1px solid var(--line); border-radius: 999px;
  background: rgba(20,18,16,.35); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.nav-links a { font-size: 13px; padding: 6px 14px; border-radius: 999px; color: var(--fg-2); transition: color .3s, background .3s; }
.nav-links a:hover { color: var(--fg); background: rgba(243,237,228,.06); }
.nav-cta { font-size: 13px; padding: 9px 18px; border-radius: 999px; background: var(--fg); color: #0b0a09; font-weight: 500;
  display: inline-flex; gap: 6px; transition: background .3s; will-change: transform; }
.nav-cta:hover { background: var(--clay-soft); }

/* ---------- shared ---------- */
.label { font-family: var(--mono); font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--fg-3); }
.label span { color: var(--clay); margin-right: 10px; }
.sec-head { margin-bottom: clamp(48px, 7vw, 96px); }
.sec-title { font-family: var(--serif); font-weight: 400; font-size: clamp(44px, 7vw, 110px); line-height: .95; letter-spacing: -.02em; margin-top: 24px; }
.sec-title em { color: var(--clay-soft); }

.reveal { opacity: 0; transform: translateY(40px); transition: opacity 1.2s var(--ease), transform 1.2s var(--ease); transition-delay: var(--rd, 0s); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100vh; min-height: 100svh; padding: 0 var(--pad) 8vh; display: flex; flex-direction: column; justify-content: flex-end; }
.eyebrow { display: inline-flex; align-items: center; gap: 12px; font-family: var(--mono); font-size: 12px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--fg-2); margin-bottom: 18px; }
.pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--clay); box-shadow: 0 0 0 0 rgba(217,119,87,.6); animation: pulse 2.4s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(217,119,87,.55); } 70% { box-shadow: 0 0 0 12px rgba(217,119,87,0); } 100% { box-shadow: 0 0 0 0 rgba(217,119,87,0); } }
.hero-title { font-family: var(--serif); font-weight: 400; font-size: clamp(76px, 15.5vw, 260px); line-height: .84; letter-spacing: -.035em; }
.hero-title .mask { display: block; overflow: hidden; padding: 0 .04em .06em 0; }
.hero-title .mask > span { display: inline-block; }
.hero-title em { color: var(--clay-soft); padding-right: .04em; }
.hero-in { opacity: 0; transform: translateY(105%); transition: transform 1.6s var(--ease), opacity 1.6s var(--ease); transition-delay: var(--d, 0s); }
.eyebrow.hero-in, .hero-sub.hero-in, .spec.hero-in, .scroll-hint.hero-in { transform: translateY(24px); }
.is-ready .hero-in { opacity: 1; transform: none; }
.hero-foot { display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; margin-top: 36px; }
.hero-sub { font-size: clamp(15px, 1.25vw, 19px); color: var(--fg-2); max-width: 30em; line-height: 1.85; }
.spec { display: grid; gap: 8px; min-width: 300px; }
.spec div { display: flex; justify-content: space-between; gap: 24px; border-top: 1px solid var(--line); padding-top: 8px; font-size: 12.5px; }
.spec dt { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--fg-3); }
.spec dd { color: var(--fg-2); }
.scroll-hint { position: absolute; left: 50%; bottom: 3vh; margin-left: -20px; width: 40px; display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--fg-3); }
.scroll-hint i { width: 1px; height: 46px; background: linear-gradient(var(--fg-3), transparent); position: relative; overflow: hidden; }
.scroll-hint i::after { content: ""; position: absolute; left: 0; top: -40%; width: 1px; height: 40%; background: var(--clay); animation: drip 2.2s var(--ease-io) infinite; }
@keyframes drip { to { top: 110%; } }

/* ---------- prologue ---------- */
.prologue { min-height: 140vh; padding: 30vh var(--pad) 20vh; max-width: 1400px; margin: 0 auto; }
.lit-text { font-size: clamp(28px, 4.2vw, 62px); line-height: 1.45; letter-spacing: .01em; font-weight: 400; margin-top: 40px; }
.lit-text .c { opacity: .14; transition: opacity .5s, color .5s; }
.lit-text .c.on { opacity: 1; }
.lit-text .c.hl { color: var(--clay-soft); }
.prologue-en { font-family: var(--serif); font-size: clamp(22px, 2.4vw, 34px); color: var(--fg-2); margin-top: 48px; }
.prologue-en em { color: var(--fg); }

/* ---------- film ---------- */
.film { position: relative; height: 640vh; }
.film-sticky { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
.hud { position: absolute; left: var(--pad); right: var(--pad); display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--fg-2); z-index: 45;
  opacity: 0; transition: opacity .8s; }
.film-on .hud { opacity: 1; }
.hud-top { top: calc(7vh + 22px); }
.hud-bottom { bottom: calc(7vh + 22px); }
.hud-left { display: flex; align-items: center; gap: 12px; }
.hud-dim { color: var(--fg-3); letter-spacing: .05em; }
.rec { width: 8px; height: 8px; border-radius: 50%; background: #e5484d; animation: blink 1.4s steps(1) infinite; }
@keyframes blink { 50% { opacity: .15; } }
.ch-track { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; width: 100%; }
.ch-tick { display: flex; flex-direction: column; gap: 10px; color: var(--fg-3); transition: color .5s; font-size: 10.5px; cursor: pointer; }
.ch-tick:hover { color: var(--fg-2); }
.ch-tick span { color: var(--fg-3); margin-right: 6px; }
.ch-tick.active { color: var(--fg); }
.ch-tick.active span { color: var(--clay); }
.ch-tick i { display: block; height: 1px; background: var(--line); position: relative; overflow: hidden; order: -1; }
.ch-tick b { position: absolute; inset: 0; background: var(--fg); transform: scaleX(0); transform-origin: left; }

.chapters { position: absolute; inset: 0; }
.chapter { position: absolute; left: var(--pad); top: 50%; width: min(460px, 40vw); transform: translateY(calc(-50% + var(--y, 0px)));
  opacity: 0; pointer-events: none; will-change: opacity, transform, filter; }
.ch-num { font-size: 11px; letter-spacing: .2em; color: var(--clay); margin-bottom: 20px; }
.chapter h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(64px, 9vw, 150px); line-height: .9; letter-spacing: -.03em; }
.chapter h2 em { color: var(--clay); }
.ch-zh { font-size: 15px; letter-spacing: .5em; color: var(--fg-2); margin: 18px 0 26px; }
.ch-body { font-size: 16px; line-height: 1.95; color: var(--fg-2); }
.chapter-final { left: 0; right: 0; width: auto; top: auto; bottom: calc(7vh + 90px); transform: translateY(var(--y, 0px)); text-align: center; }
.chapter-final .ch-num { margin-bottom: 14px; }
.ch-final { font-size: clamp(18px, 1.8vw, 24px); letter-spacing: .3em; color: var(--fg); }
.ch-final span { display: block; font-family: var(--serif); font-style: italic; font-size: clamp(16px, 1.4vw, 20px); letter-spacing: .02em; color: var(--fg-3); margin-top: 8px; }

/* ---------- marquee ---------- */
.marquee { padding: 14vh 0 10vh; overflow: hidden; white-space: nowrap; }
.marquee-track { display: inline-flex; animation: marquee 38s linear infinite; }
.marquee span { font-family: var(--serif); font-size: clamp(80px, 13vw, 220px); line-height: 1; letter-spacing: -.02em;
  color: transparent; -webkit-text-stroke: 1px rgba(243,237,228,.22); }
.marquee i { font-style: normal; -webkit-text-stroke: 0; color: var(--clay); font-size: .5em; vertical-align: middle; margin: 0 .3em; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- abilities ---------- */
.abilities, .dialogue, .principles { padding: 14vh var(--pad); max-width: 1480px; margin: 0 auto; }
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { position: relative; border: 1px solid var(--line); border-radius: 22px; padding: 30px; min-height: 340px; overflow: hidden;
  background: linear-gradient(180deg, rgba(26,23,20,.72), rgba(16,14,12,.72));
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  display: flex; flex-direction: column; justify-content: space-between; gap: 28px; isolation: isolate; }
.card::before { content: ""; position: absolute; inset: 0; z-index: -1; opacity: 0; transition: opacity .5s;
  background: radial-gradient(520px circle at var(--mx, 50%) var(--my, 50%), rgba(217,119,87,.13), transparent 45%); }
.card::after { content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; pointer-events: none; opacity: 0; transition: opacity .5s;
  background: radial-gradient(380px circle at var(--mx, 50%) var(--my, 50%), rgba(232,161,132,.55), transparent 45%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; }
.card:hover::before, .card:hover::after { opacity: 1; }
.card-wide { grid-column: span 2; flex-direction: row; align-items: stretch; }
.card-wide .card-text { flex: 0 0 42%; display: flex; flex-direction: column; justify-content: flex-end; }
.card-wide .viz { flex: 1; }
.card-num { font-size: 11px; color: var(--clay); letter-spacing: .15em; margin-bottom: 14px; }
.card h3 { font-family: var(--serif); font-weight: 400; font-size: 36px; line-height: 1.05; letter-spacing: -.01em; margin-bottom: 12px; }
.card h3 span { font-family: var(--sans); font-size: 13px; color: var(--fg-3); letter-spacing: .25em; margin-left: 10px; vertical-align: middle; }
.card p { font-size: 14.5px; color: var(--fg-2); line-height: 1.85; }
.viz { position: relative; min-height: 150px; display: grid; place-items: center; }

/* tree */
.viz-tree svg { width: 100%; max-width: 440px; color: rgba(243,237,228,.28); }
.tree-lines path { stroke-dasharray: 160; stroke-dashoffset: 160; }
.tree-lines path.hot { stroke: var(--clay); stroke-width: 1.6; }
.card.in .tree-lines path { animation: draw 1.4s var(--ease) forwards; }
.card.in .tree-lines path:nth-child(2) { animation-delay: .15s; } .card.in .tree-lines path:nth-child(3) { animation-delay: .5s; }
.card.in .tree-lines path:nth-child(4) { animation-delay: .6s; } .card.in .tree-lines path:nth-child(5) { animation-delay: .7s; }
.card.in .tree-lines path:nth-child(6) { animation-delay: .8s; } .card.in .tree-lines path:nth-child(7) { animation-delay: 1.5s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.tree-nodes circle { fill: var(--fg); opacity: 0; transition: opacity .6s, fill .6s; }
.card.in .tree-nodes circle { opacity: .9; transition-delay: .9s; }
.card.in .tree-nodes circle.dead { opacity: .25; transition-delay: 1.4s; }
.tree-nodes circle.hot { fill: var(--clay); filter: drop-shadow(0 0 8px var(--clay)); }
.card.in .tree-nodes circle.hot { transition-delay: 2.4s; }

/* code */
.viz-code { font-size: 12.5px; line-height: 1.9; color: var(--fg-2); place-items: start; align-content: center; width: 100%;
  padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: rgba(0,0,0,.25); }
.viz-code div { white-space: nowrap; opacity: 0; transform: translateX(-8px); transition: all .7s var(--ease); }
.card.in .viz-code div { opacity: 1; transform: none; }
.card.in .viz-code div:nth-child(2) { transition-delay: .15s; } .card.in .viz-code div:nth-child(3) { transition-delay: .3s; }
.card.in .viz-code div:nth-child(4) { transition-delay: .45s; } .card.in .viz-code div:nth-child(5) { transition-delay: .6s; }
.viz-code b { font-weight: 400; color: var(--clay-soft); }
.viz-code u { text-decoration: none; color: var(--fg); }
.caret { display: inline-block; width: 7px; height: 14px; background: var(--clay); vertical-align: -2px; margin-left: 3px; animation: blink 1s steps(1) infinite; }

/* orbit */
.viz-orbit { height: 170px; }
.viz-orbit .core { width: 12px; height: 12px; border-radius: 50%; background: var(--clay); box-shadow: 0 0 24px 4px rgba(217,119,87,.6); position: absolute; }
.ring { position: absolute; border: 1px dashed rgba(243,237,228,.14); border-radius: 50%; animation: spin linear infinite; }
.ring i { position: absolute; top: -4px; left: 50%; width: 8px; height: 8px; margin-left: -4px; border-radius: 50%; background: var(--fg); box-shadow: 0 0 10px rgba(243,237,228,.8); }
.r1 { width: 70px; height: 70px; animation-duration: 6s; }
.r2 { width: 120px; height: 120px; animation-duration: 10s; animation-direction: reverse; }
.r2 i { background: var(--clay-soft); }
.r3 { width: 170px; height: 170px; animation-duration: 16s; }

/* vision */
.viz-vision .frame { position: relative; width: 100%; max-width: 260px; aspect-ratio: 16 / 10; border-radius: 10px; overflow: hidden;
  background: linear-gradient(180deg, #2a1d17, #15110e); border: 1px solid var(--line); }
.sun { position: absolute; width: 38px; height: 38px; border-radius: 50%; background: var(--clay-soft); top: 22%; right: 22%; opacity: .8; }
.hill { position: absolute; bottom: -40%; border-radius: 50%; }
.h1 { width: 90%; height: 80%; left: -20%; background: #3b2a22; }
.h2 { width: 100%; height: 90%; right: -40%; background: #4a3328; }
.scan { position: absolute; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--clay), transparent);
  box-shadow: 0 0 14px var(--clay); animation: scan 3s var(--ease-io) infinite; }
@keyframes scan { 0% { top: 0; } 50% { top: 100%; } 100% { top: 0; } }
.box { position: absolute; left: 6%; top: 40%; width: 58%; height: 52%; border: 1px solid var(--clay); border-radius: 4px; opacity: 0; animation: boxin 3s infinite; }
.box span { position: absolute; top: -18px; left: -1px; font-size: 9px; background: var(--clay); color: #0b0a09; padding: 1px 6px; border-radius: 2px; white-space: nowrap; }
@keyframes boxin { 0%, 45% { opacity: 0; transform: scale(1.06); } 55%, 90% { opacity: 1; transform: none; } 100% { opacity: 0; } }

/* write */
.viz-write p { font-family: var(--serif); font-size: clamp(32px, 3vw, 44px) !important; line-height: 1.1 !important; color: var(--fg) !important; text-align: center; }
.viz-write em { color: var(--clay-soft); position: relative; }
.viz-write em::after { content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px; background: var(--clay); transform: scaleX(0); transform-origin: left; transition: transform 1.2s var(--ease) .6s; }
.card.in .viz-write em::after { transform: scaleX(1); }

/* doc */
.viz-doc { overflow: hidden; border-radius: 12px; border: 1px solid var(--line); background: rgba(0,0,0,.22); min-height: 220px;
  -webkit-mask: linear-gradient(transparent, #000 25%, #000 75%, transparent); mask: linear-gradient(transparent, #000 25%, #000 75%, transparent); }
.doc-scroll { position: absolute; inset: 0 22px; animation: docscroll 30s linear infinite; }
.doc-scroll i { display: block; height: 4px; border-radius: 2px; background: rgba(243,237,228,.1); margin: 9px 0; }
.doc-scroll i.k { background: var(--clay); box-shadow: 0 0 10px rgba(217,119,87,.7); }
.doc-lens { position: absolute; left: 10px; right: 10px; top: 50%; height: 34px; margin-top: -17px; border: 1px solid rgba(232,161,132,.4); border-radius: 8px;
  background: rgba(217,119,87,.05); }
@keyframes docscroll { to { transform: translateY(-50%); } }

/* ---------- terminal ---------- */
.term { max-width: 980px; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; margin-left: auto;
  background: rgba(14,12,11,.82); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 40px 120px -40px rgba(217,119,87,.25), 0 0 0 1px rgba(0,0,0,.4); }
.term-bar { display: flex; align-items: center; gap: 8px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.term-bar i { width: 11px; height: 11px; border-radius: 50%; background: rgba(243,237,228,.14); }
.term-bar span { margin: 0 auto; font-size: 11.5px; color: var(--fg-3); transform: translateX(-24px); }
.term-body { padding: 26px 28px 30px; font-size: 13.5px; line-height: 1.95; min-height: 430px; color: var(--fg-2); }
.term-body .ln { white-space: pre-wrap; word-break: break-all; }
.term-body .u { color: var(--fg); }
.term-body .u::before { content: "› "; color: var(--clay); }
.term-body .cmd { color: var(--fg-3); }
.term-body .cmd::before { content: "$ "; color: var(--clay-soft); }
.term-body .ok { color: #8fbf8a; }
.term-body .say { color: var(--fg); font-family: var(--sans); font-size: 14.5px; }
.term-body .say::before { content: "✻ "; color: var(--clay); font-family: var(--mono); }
.term-body .think { color: var(--fg-3); background: linear-gradient(90deg, var(--fg-3) 30%, var(--fg) 50%, var(--fg-3) 70%);
  background-size: 200% 100%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: shimmer 1.6s linear infinite; }
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: -100% 0; } }
.term-body .cur { display: inline-block; width: 8px; height: 16px; background: var(--fg); vertical-align: -3px; animation: blink 1s steps(1) infinite; }

/* ---------- principles ---------- */
.pr-row { display: grid; grid-template-columns: 1.4fr 1fr; align-items: end; gap: 40px; padding: 34px 0; border-top: 1px solid var(--line); }
.pr-row:last-child { border-bottom: 1px solid var(--line); }
.pr-row h3 { font-family: var(--serif); font-weight: 400; font-size: clamp(64px, 10vw, 170px); line-height: .9; letter-spacing: -.03em;
  transition: transform .9s var(--ease), color .6s; transform-origin: left bottom; }
.pr-row h3 em { color: var(--clay); }
.pr-row:hover h3 { transform: translateX(24px); font-style: italic; color: var(--clay-soft); }
.pr-zh { font-size: 13px !important; letter-spacing: .5em; color: var(--clay) !important; margin-bottom: 8px; }
.pr-row p { font-size: clamp(17px, 1.5vw, 21px); color: var(--fg-2); }

/* ---------- finale ---------- */
.finale { min-height: 78vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 100px var(--pad) 4vh; }
.finale-spark { width: 48px; height: 48px; color: var(--clay); margin-bottom: 28px; animation: spin 14s linear infinite; }
.finale-spark.reveal.in { transform: none; }
.finale-title { font-family: var(--serif); font-weight: 400; font-size: clamp(60px, 10.5vw, 176px); line-height: .88; letter-spacing: -.035em; }
.finale-title em { color: var(--clay-soft); }
.finale-sub { color: var(--fg-2); font-size: 16px; letter-spacing: .3em; margin: 26px 0 36px; }
.btn { display: inline-flex; align-items: center; gap: 18px; padding: 16px 18px 16px 30px; border-radius: 999px; background: var(--fg); color: #0b0a09;
  font-size: 15px; font-weight: 500; letter-spacing: .1em; position: relative; overflow: hidden; will-change: transform; }
.btn i { font-style: normal; width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; background: #0b0a09; color: var(--fg);
  transition: transform .6s var(--ease), background .4s; }
.btn:hover i { transform: rotate(-45deg); background: var(--clay); }
.btn span { position: relative; z-index: 1; }

/* ---------- footer (deliberately quiet) ---------- */
.footer { padding: 28px var(--pad) 20px; text-align: center; }
.credit { font-family: var(--serif); font-style: italic; font-size: 14px; color: var(--fg-3); margin-bottom: 18px; }
.beian { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 4px 14px; font-size: 10.5px; line-height: 1.6;
  color: rgba(243,237,228,.2); letter-spacing: .02em; transition: color .4s; }
.beian:hover { color: rgba(243,237,228,.5); }
.beian a { display: inline-flex; align-items: center; gap: 4px; }
.beian img { width: 11px; height: 11px; opacity: .35; filter: grayscale(1); transition: opacity .4s, filter .4s; }
.beian:hover img { opacity: .8; filter: none; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .bento { grid-template-columns: 1fr 1fr; }
  .card-wide { grid-column: span 2; }
}
@media (max-width: 760px) {
  .nav { padding: 16px var(--pad); }
  .nav-links { display: none; }
  .nav-cta { padding: 8px 14px; font-size: 12px; }
  .hero { padding-bottom: 12vh; }
  .hero-foot { flex-direction: column; align-items: flex-start; gap: 24px; margin-top: 24px; }
  .spec { min-width: 0; width: 100%; }
  .scroll-hint { display: none; }
  .prologue { padding-top: 22vh; }
  .chapter { width: auto; right: var(--pad); top: auto; bottom: calc(7vh + 72px); transform: translateY(var(--y, 0px)); }
  .chapter h2 { font-size: 60px; }
  .ch-zh { margin: 10px 0 14px; }
  .ch-body { font-size: 14px; line-height: 1.85; }
  .chapter-final { bottom: calc(7vh + 90px); }
  .ch-track { gap: 10px; }
  .ch-tick { font-size: 0; } .ch-tick span { font-size: 10px; }
  .hud-dim { display: none; }
  .bento { grid-template-columns: 1fr; }
  .card-wide { grid-column: auto; flex-direction: column; }
  .card-wide .card-text { flex: none; }
  .card { min-height: 0; }
  .term-body { padding: 20px; font-size: 12px; min-height: 460px; }
  .term-bar span { display: none; }
  .pr-row { grid-template-columns: 1fr; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .grain, .marquee-track, .ring, .scan, .doc-scroll, .loader-spark, .finale-spark { animation: none !important; }
  html { scroll-behavior: auto; }
}