/* ============================================================
   LLLAZ · Atelier
   两套主题共用一套变量：atelier（暖白纸感）、nocturne（夜）
   ============================================================ */

:root {
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Source Han Serif SC", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --gutter: clamp(20px, 6vw, 120px);
  --measure: 34rem;
}

html[data-theme="atelier"] {
  --bg: #f6f3ec;
  --bg-soft: #efeae0;
  --ink: #17160f;
  --ink-2: #45423a;
  --ink-3: #7d786b;
  --rule: rgba(23, 22, 15, .14);
  --rule-strong: rgba(23, 22, 15, .34);
  --accent: #1f4d3a;
  --accent-ink: #ffffff;
  --dot: #2f8f5b;
  --canvas-a: #14180f;
  --canvas-b: #0d1210;
  --glow-a: #c9ff4d;
  --glow-b: #4dc9ff;
  --frame: #e4ddcf;
  --shadow: 0 40px 120px -60px rgba(23, 22, 15, .55);
}

html[data-theme="nocturne"] {
  --bg: #0a0a0b;
  --bg-soft: #121214;
  --ink: #edede6;
  --ink-2: #a8a8a0;
  --ink-3: #6d6d66;
  --rule: rgba(237, 237, 230, .14);
  --rule-strong: rgba(237, 237, 230, .34);
  --accent: #c9ff4d;
  --accent-ink: #10120c;
  --dot: #c9ff4d;
  --canvas-a: #0a0d0b;
  --canvas-b: #050706;
  --glow-a: #c9ff4d;
  --glow-b: #7b6bff;
  --frame: #1c1c1f;
  --shadow: 0 40px 140px -60px rgba(0, 0, 0, .9);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .6s var(--ease), color .6s var(--ease);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-weight: 400; }
p { margin: 0; }
img { display: block; }

/* 纸张颗粒：极淡的噪声，只在大屏启用 */
.grain {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  opacity: .5; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='160' height='160' filter='url(%23n)' opacity='.045'/></svg>");
}
html[data-theme="nocturne"] .grain { mix-blend-mode: screen; opacity: .35; }

/* ---------------- header ---------------- */

.top {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: clamp(16px, 3vw, 40px);
  padding: 18px var(--gutter);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--rule);
}

.mark { display: inline-flex; align-items: baseline; gap: .5rem; letter-spacing: .14em; }
.mark__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); align-self: center; }
.mark__word { font-family: var(--mono); font-size: .82rem; letter-spacing: .28em; }
.mark__sub { font-family: var(--serif); font-style: italic; font-size: .95rem; color: var(--ink-3); }

.nav { display: flex; gap: clamp(14px, 2.2vw, 30px); margin-left: auto; font-size: .84rem; letter-spacing: .06em; }
.nav a { color: var(--ink-2); position: relative; padding-bottom: 2px; }
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .4s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { transform: scaleX(1); }
.nav__back { font-family: var(--mono); }

.toggle {
  display: inline-flex; align-items: center; gap: .55rem;
  background: none; border: 0; padding: 0; color: var(--ink-2);
  font: inherit; font-size: .78rem; letter-spacing: .08em; cursor: pointer;
}
.toggle__track {
  position: relative; width: 34px; height: 18px; border-radius: 999px;
  border: 1px solid var(--rule-strong); display: inline-block; transition: background .4s var(--ease);
}
.toggle__knob {
  position: absolute; top: 2px; left: 2px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--ink-2); transition: transform .4s var(--ease), background .4s var(--ease);
}
html[data-theme="nocturne"] .toggle__track { background: color-mix(in srgb, var(--accent) 22%, transparent); }
html[data-theme="nocturne"] .toggle__knob { transform: translateX(16px); background: var(--accent); }
.toggle__label { font-family: var(--mono); min-width: 4.6em; text-align: left; }

/* ---------------- hero ---------------- */

main { position: relative; z-index: 1; }

.hero {
  padding: clamp(56px, 12vh, 132px) var(--gutter) clamp(40px, 8vh, 90px);
  max-width: 1400px;
}

.eyebrow {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .34em;
  color: var(--ink-3); text-transform: uppercase; margin-bottom: clamp(24px, 4vh, 44px);
}

.display {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 8.4vw, 7.4rem);
  line-height: .98;
  letter-spacing: -.025em;
  display: flex; flex-direction: column;
}
.display span { display: block; }
.display__indent { padding-left: clamp(24px, 8vw, 160px); }
.display__last { font-style: italic; color: var(--accent); }

html[data-theme="atelier"] .display__last { color: var(--accent); }

.lede {
  max-width: var(--measure); margin-top: clamp(28px, 5vh, 52px);
  color: var(--ink-2); font-size: clamp(15px, 1.15vw, 18px); line-height: 1.85;
}

.facts {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px; margin: clamp(36px, 6vh, 64px) 0 0; padding: 0;
  border-top: 1px solid var(--rule);
}
.facts > div { padding: 18px 20px 20px; border-right: 1px solid var(--rule); }
.facts > div:last-child { border-right: 0; }
.facts dt { font-family: var(--mono); font-size: .68rem; letter-spacing: .2em; color: var(--ink-3); margin-bottom: 6px; }
.facts dd { margin: 0; font-family: var(--serif); font-size: clamp(1rem, 1.5vw, 1.32rem); }

.scroll-hint {
  display: inline-flex; align-items: center; gap: .7rem; margin-top: clamp(40px, 7vh, 76px);
  font-family: var(--mono); font-size: .72rem; letter-spacing: .26em; color: var(--ink-3);
}
.scroll-hint__line { display: block; width: 56px; height: 1px; background: var(--rule-strong); position: relative; overflow: hidden; }
.scroll-hint__line::after {
  content: ""; position: absolute; inset: 0; background: var(--accent);
  transform: translateX(-100%); animation: sweep 2.6s var(--ease) infinite;
}
@keyframes sweep { 0% { transform: translateX(-100%); } 55%, 100% { transform: translateX(100%); } }

/* ---------------- sections ---------------- */

.space, .works, .method { padding: clamp(64px, 12vh, 140px) var(--gutter); border-top: 1px solid var(--rule); max-width: 1400px; }

.section-no {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .3em; color: var(--ink-3);
  margin-bottom: clamp(14px, 2.4vh, 24px);
}

.h2 {
  font-family: var(--serif); font-size: clamp(1.75rem, 3.6vw, 3.1rem);
  line-height: 1.14; letter-spacing: -.015em; max-width: 24ch;
}

.space__head { display: grid; gap: clamp(14px, 2vh, 22px); margin-bottom: clamp(28px, 4vh, 44px); }
.space__note { max-width: var(--measure); color: var(--ink-2); }

.canvas-wrap {
  position: relative; border-radius: 20px; overflow: hidden;
  border: 1px solid var(--frame);
  background: linear-gradient(160deg, var(--canvas-a), var(--canvas-b));
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 9;
  min-height: 320px;
}
#scene { display: block; width: 100%; height: 100%; }

.hud {
  position: absolute; left: 18px; bottom: 16px; margin: 0;
  display: flex; gap: 18px;
  font-family: var(--mono); font-size: .66rem; letter-spacing: .1em;
  color: rgba(240, 245, 235, .58);
  mix-blend-mode: screen;
}
.hud dt { margin: 0 0 2px; opacity: .7; }
.hud dd { margin: 0; color: rgba(240, 245, 235, .92); font-variant-numeric: tabular-nums; }

.canvas-fallback { display: none; }
.canvas-fallback:not([hidden]) {
  position: absolute; inset: 0; display: grid; place-content: center;
  text-align: center; color: rgba(240, 245, 235, .7); font-size: .9rem; padding: 24px;
  background: radial-gradient(circle at 50% 60%, rgba(0,0,0,.35), transparent 70%);
}

/* ---------------- works ---------------- */

.works__head { margin-bottom: clamp(28px, 4vh, 48px); display: grid; gap: 16px; }

.work-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.work a {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1.1fr) minmax(0, 1.6fr) 6rem;
  align-items: baseline; gap: clamp(12px, 2vw, 32px);
  padding: clamp(22px, 3.4vh, 34px) 4px;
  border-bottom: 1px solid var(--rule);
  transition: padding-left .45s var(--ease), background .45s var(--ease);
}
.work a:hover { padding-left: 18px; background: linear-gradient(90deg, var(--bg-soft), transparent 70%); }
.work__no { font-family: var(--mono); font-size: .72rem; color: var(--ink-3); letter-spacing: .16em; }
.work__title { font-family: var(--serif); font-size: clamp(1.3rem, 2.4vw, 1.9rem); }
.work__desc { color: var(--ink-2); font-size: .94rem; line-height: 1.7; }
.work__tag {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .18em; color: var(--ink-3);
  justify-self: end; border: 1px solid var(--rule); border-radius: 999px; padding: 4px 10px;
}

/* ---------------- method ---------------- */

.method__grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 56px); margin-top: clamp(26px, 4vh, 44px);
}
.method__grid h3 { font-family: var(--serif); font-size: 1.22rem; margin-bottom: 10px; }
.method__grid p { color: var(--ink-2); font-size: .95rem; }

/* ---------------- footer ---------------- */

.foot { border-top: 1px solid var(--rule); padding: clamp(40px, 7vh, 72px) var(--gutter); position: relative; z-index: 1; }
.foot__inner { display: grid; gap: 10px; max-width: 1400px; }
.foot__sign { font-family: var(--serif); font-style: italic; font-size: 1.1rem; }
.foot__note { color: var(--ink-3); font-size: .86rem; max-width: 40ch; }
.foot__meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 22px;
  margin-top: 14px; font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; color: var(--ink-3);
}
.foot__meta a:hover { color: var(--accent); }
.status-dot { display: inline-block; width: 6px; height: 6px; margin-right: .5rem; border-radius: 50%; background: var(--dot); box-shadow: 0 0 0 3px color-mix(in srgb, var(--dot) 18%, transparent); }
.gongan-line { display: inline-flex; align-items: center; gap: .35rem; }
.gongan-line img { width: 20px; height: 20px; flex: none; opacity: .9; }
.gongan-line:hover img { opacity: 1; }

/* ---------------- reveal ---------------- */

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint__line::after { animation: none; }
}

/* ---------------- responsive ---------------- */

@media (max-width: 900px) {
  .nav { display: none; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts > div:nth-child(2n) { border-right: 0; }
  .work a { grid-template-columns: 2.6rem 1fr; row-gap: 8px; }
  .work__desc { grid-column: 1 / -1; }
  .work__tag { justify-self: start; }
  .method__grid { grid-template-columns: 1fr; }
  .canvas-wrap { aspect-ratio: 4 / 3; }
}

@media (max-width: 560px) {
  .display { font-size: clamp(2.2rem, 11vw, 3.2rem); }
  .display__indent { padding-left: 1.2rem; }
  .ten .toggle__label { display: none; }
  .foot__meta { flex-direction: column; align-items: flex-start; gap: 8px; }
}