/* ============================================================
   FABLE — Generative Atelier
   Handwritten design system. Zero dependencies.
   ============================================================ */

:root {
  --bg: #06060b;
  --bg-2: #0b0b14;
  --ink: #eae8f2;
  --ink-dim: #9a96ad;
  --line: rgba(234, 232, 242, 0.10);
  --violet: #7c5cff;
  --cyan: #4ad7ff;
  --pink: #ff5ca8;
  --grad: linear-gradient(100deg, var(--violet), var(--cyan) 55%, var(--pink));
  --font-jp: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic Medium", "Noto Sans JP", system-ui, sans-serif;
  --font-en: "Avenir Next", "Helvetica Neue", Futura, system-ui, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-jp);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--violet); color: #fff; }

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

canvas.stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* film grain overlay */
.grain {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  pointer-events: none;
  z-index: 40;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='128' height='128'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='128' height='128' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 0.9s steps(4) infinite;
}
@keyframes grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 1%); }
  50% { transform: translate(1%, -2%); }
  75% { transform: translate(-1%, 2%); }
  100% { transform: translate(2%, -1%); }
}

/* ---------------- nav ---------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  mix-blend-mode: normal;
  background: linear-gradient(rgba(6,6,11,0.75), transparent);
  backdrop-filter: blur(2px);
}
.nav-logo {
  font-family: var(--font-en);
  font-weight: 700;
  letter-spacing: 0.42em;
  font-size: 15px;
}
.nav-logo em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links { display: flex; gap: 6px; }
.nav-links a {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  padding: 7px 11px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: color .25s, border-color .25s, background .25s;
}
.nav-links a b { font-weight: 600; margin-right: 4px; color: var(--ink); }
.nav-links a:hover { color: var(--ink); border-color: var(--line); }
.nav-links a.on {
  color: var(--ink);
  border-color: var(--line);
  background: rgba(124, 92, 255, 0.14);
}
@media (max-width: 760px) {
  .nav { padding: 14px 16px; }
  .nav-links a span { display: none; }
  .nav-links a { padding: 7px 9px; }
}

/* ---------------- home ---------------- */
.home main { position: relative; z-index: 2; }

.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 20px;
}
.hero-kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--cyan);
  margin-bottom: 26px;
}
.hero-title {
  font-family: var(--font-en);
  font-size: clamp(72px, 17vw, 220px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: 0.06em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 42px rgba(124, 92, 255, 0.35));
}
.hero-sub {
  margin-top: 30px;
  font-size: clamp(15px, 2.2vw, 19px);
  line-height: 2.1;
  color: var(--ink-dim);
}
.hero-sub strong { color: var(--ink); font-weight: 600; }
.hero-cta {
  margin-top: 44px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 14px 30px;
  border-radius: 999px;
  transition: border-color .3s, box-shadow .3s, transform .3s;
}
.hero-cta:hover {
  border-color: var(--violet);
  box-shadow: 0 0 34px rgba(124, 92, 255, 0.35);
  transform: translateY(-2px);
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 110px 24px;
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 54px;
}
.section-head h2 {
  font-family: var(--font-en);
  font-size: clamp(28px, 4.6vw, 44px);
  font-weight: 700;
  letter-spacing: 0.12em;
}
.section-head span {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
}

.cards { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.card {
  position: relative;
  grid-column: span 2;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 30px 26px 26px;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(120% 100% at 20% 0%, var(--tint, rgba(124,92,255,0.16)), transparent 60%),
    var(--bg-2);
  overflow: hidden;
  transition: transform .4s cubic-bezier(.2,.8,.2,1), border-color .4s, box-shadow .4s;
}
.card:nth-child(1), .card:nth-child(2) { grid-column: span 3; }
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(234,232,242,0.28);
  box-shadow: 0 24px 60px -24px var(--tint, rgba(124,92,255,0.5));
}
.card .kanji {
  position: absolute;
  right: -6px;
  bottom: -34px;
  font-size: 150px;
  font-weight: 700;
  color: rgba(234,232,242,0.055);
  user-select: none;
  transition: color .4s, transform .6s;
}
.card:hover .kanji { color: rgba(234,232,242,0.12); transform: translateY(-8px); }
.card .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
  margin-bottom: 18px;
}
.card h3 {
  font-family: var(--font-en);
  font-size: 26px;
  letter-spacing: 0.14em;
  font-weight: 700;
  margin-bottom: 6px;
}
.card .jp {
  font-size: 13px;
  color: var(--acc, var(--violet));
  letter-spacing: 0.3em;
  margin-bottom: 16px;
}
.card p {
  font-size: 13.5px;
  line-height: 2;
  color: var(--ink-dim);
  flex: 1;
}
.card .tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.card .tags i {
  font-style: normal;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  padding: 4px 9px;
  border-radius: 999px;
}
@media (max-width: 900px) {
  .card, .card:nth-child(1), .card:nth-child(2) { grid-column: span 6; min-height: 240px; }
}

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.stat {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 34px 28px;
  background: var(--bg-2);
}
.stat b {
  display: block;
  font-family: var(--font-en);
  font-size: clamp(36px, 5vw, 54px);
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  line-height: 1.9;
}
@media (max-width: 760px) { .stats { grid-template-columns: 1fr; } }

.manifesto {
  margin-top: 70px;
  border-left: 2px solid var(--violet);
  padding-left: 26px;
  max-width: 720px;
}
.manifesto p {
  font-size: 15px;
  line-height: 2.3;
  color: var(--ink-dim);
}
.manifesto p strong { color: var(--ink); }

footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--line);
  padding: 46px 24px 60px;
  text-align: center;
}
footer .wish {
  font-size: 14px;
  color: var(--ink-dim);
  letter-spacing: 0.1em;
  line-height: 2.2;
}
footer .sig {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  opacity: 0.7;
}

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* ---------------- demo pages ---------------- */
.demo body, body.demo { overflow: hidden; height: 100svh; }

.demo-hud {
  position: fixed;
  z-index: 30;
  left: 24px;
  bottom: 24px;
  max-width: 330px;
  pointer-events: none;
}
.demo-hud h1 {
  font-family: var(--font-en);
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.16em;
}
.demo-hud h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.demo-hud p {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.9;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}

.panel {
  position: fixed;
  z-index: 30;
  right: 20px;
  bottom: 20px;
  width: 264px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(10, 10, 18, 0.78);
  backdrop-filter: blur(14px);
  padding: 18px 18px 16px;
}
.panel h2 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
  margin-bottom: 14px;
}
.ctl { margin-bottom: 13px; }
.ctl label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
  margin-bottom: 6px;
}
.ctl label output { font-family: var(--mono); color: var(--ink); }
.ctl input[type="range"] {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  outline: none;
}
.ctl input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--bg);
  box-shadow: 0 0 10px rgba(124,92,255,0.8);
  cursor: pointer;
}
.ctl select, .btn {
  width: 100%;
  background: rgba(234,232,242,0.06);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 9px 10px;
  cursor: pointer;
  font-family: var(--font-jp);
}
.btn { transition: background .25s, border-color .25s, box-shadow .25s; text-align: center; }
.btn:hover { border-color: var(--violet); box-shadow: 0 0 18px rgba(124,92,255,0.3); }
.btn.primary {
  background: linear-gradient(100deg, rgba(124,92,255,0.85), rgba(74,215,255,0.65));
  border-color: transparent;
  font-weight: 600;
}
.btn-row { display: flex; gap: 8px; }
.btn-row .btn { flex: 1; }
.check {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: 0.1em; color: var(--ink-dim);
  cursor: pointer; user-select: none;
}
.check input { accent-color: var(--violet); }

.panel-toggle {
  position: fixed;
  z-index: 31;
  right: 20px;
  bottom: 20px;
  display: none;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(10,10,18,0.85);
  color: var(--ink);
  font-size: 18px;
  cursor: pointer;
}
@media (max-width: 760px) {
  .demo-hud { left: 16px; bottom: 84px; max-width: 240px; }
  .demo-hud p { display: none; }
  .panel { display: none; right: 16px; bottom: 76px; width: min(264px, calc(100vw - 32px)); }
  .panel.open { display: block; }
  .panel-toggle { display: block; right: 16px; bottom: 20px; }
}

.hint {
  position: fixed;
  z-index: 30;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-dim);
  pointer-events: none;
  animation: hint 3.2s ease infinite;
  white-space: nowrap;
}
@keyframes hint { 0%,100% { opacity: 0.35; } 50% { opacity: 0.9; } }
@media (max-width: 900px) { .hint { display: none; } }

.gl-error {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  color: var(--ink-dim);
  font-size: 14px;
  line-height: 2;
  z-index: 60;
}

/* ---------------- sound page grid ---------------- */
.seq-wrap {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  padding: 90px 20px 170px;
}
.seq {
  pointer-events: auto;
  display: grid;
  grid-template-columns: repeat(16, minmax(18px, 44px));
  gap: 6px;
  width: min(92vw, 900px);
}
.seq button {
  aspect-ratio: 1;
  width: 100%;
  border-radius: 6px;
  border: 1px solid rgba(234,232,242,0.09);
  background: rgba(234,232,242,0.045);
  cursor: pointer;
  transition: background .15s, box-shadow .2s, transform .15s;
  padding: 0;
}
.seq button:hover { background: rgba(234,232,242,0.14); }
.seq button.on {
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  border-color: transparent;
  box-shadow: 0 0 14px rgba(124,92,255,0.65);
}
.seq button.play { transform: scale(1.12); }
.seq button.col { border-color: rgba(74,215,255,0.4); }
@media (max-width: 700px) { .seq { gap: 3px; } .seq button { border-radius: 4px; } }

/* custom cursor */
.cursor-dot, .cursor-ring {
  position: fixed;
  z-index: 90;
  pointer-events: none;
  border-radius: 50%;
  top: 0; left: 0;
}
.cursor-dot { width: 6px; height: 6px; background: var(--cyan); }
.cursor-ring {
  width: 34px; height: 34px;
  border: 1px solid rgba(124,92,255,0.55);
  transition: width .2s, height .2s, border-color .2s;
}
@media (hover: none) { .cursor-dot, .cursor-ring { display: none; } }