/* ============================================================
   釉 YŪ — tokens.css
   The shared CSS foundation for every page.
   Palette: 粉引 / 鉄釉 / 瑠璃 / 織部 / 灰 / 飴
   Type:   Fraunces (Latin display) · Zen Old Mincho (JP display)
           · Zen Kaku Gothic New (body)
   Pages link ONLY this file for shared styles.
   ============================================================ */

/* ---------- a. DESIGN TOKENS ---------- */
:root {
  /* raw named glaze colors */
  --kohiki:  #efe9dd; /* 粉引 — paper substrate */
  --tetsu:   #17140f; /* 鉄釉 — near-black ink */
  --ruri:    #21506f; /* 瑠璃 — blue glaze field */
  --oribe:   #46603b; /* 織部 — green glaze field */
  --hai:     #8b8676; /* 灰  — muted / hairline */
  --ame:     #c1692a; /* 飴  — accent (< 10% of any view) */

  /* semantic roles */
  --color-bg:        var(--kohiki);
  --color-fg:        var(--tetsu);
  --color-surface-1: var(--ruri);
  --color-surface-2: var(--oribe);
  --color-muted:     var(--hai);
  --color-accent:    var(--ame);

  /* accent is a runtime variable — the kiln scene overwrites --accent-live */
  --accent-live: var(--ame);

  /* tinted alpha helpers */
  --fg-04: color-mix(in srgb, var(--color-fg) 4%, transparent);
  --fg-08: color-mix(in srgb, var(--color-fg) 8%, transparent);
  --fg-12: color-mix(in srgb, var(--color-fg) 12%, transparent);
  --fg-15: color-mix(in srgb, var(--color-fg) 15%, transparent);
  --paper-70: color-mix(in srgb, var(--color-bg) 70%, transparent);

  /* fluid type scale */
  --step--1:      clamp(0.82rem, 0.78rem + 0.2vw, 0.94rem);
  --step-0:       clamp(1rem, 0.94rem + 0.3vw, 1.12rem);
  --step-1:       clamp(1.3rem, 1.05rem + 1vw, 1.9rem);
  --step-2:       clamp(2rem, 1.4rem + 2.4vw, 3.4rem);
  --step-3:       clamp(2.8rem, 1.6rem + 4.6vw, 5.6rem);
  --step-4:       clamp(3.4rem, 1.6rem + 6.4vw, 8rem);
  --step-display: clamp(3.6rem, 10vw, 12rem);

  /* font stacks */
  --font-display: "Fraunces", "Zen Old Mincho", Georgia, "Times New Roman", serif;
  --font-mincho:  "Zen Old Mincho", "Fraunces", "Yu Mincho", "Hiragino Mincho ProN", serif;
  --font-body:    "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;

  /* leading */
  --lh-display-latin: 0.92;
  --lh-display-jp:    1.0;
  --lh-body-jp:       1.95;
  --lh-label:         1.4;

  /* spacing scale (fluid where useful) */
  --space-1: clamp(0.5rem, 0.4rem + 0.4vw, 0.75rem);
  --space-2: clamp(0.85rem, 0.7rem + 0.6vw, 1.25rem);
  --space-3: clamp(1.25rem, 1rem + 1vw, 2rem);
  --space-4: clamp(2rem, 1.5rem + 2vw, 3.5rem);
  --space-5: clamp(3rem, 2rem + 4vw, 6rem);
  --space-6: clamp(4.5rem, 3rem + 6vw, 9rem);
  --space-7: clamp(7rem, 4rem + 10vw, 14rem);
  --space-8: clamp(10rem, 6rem + 16vw, 22rem);
  --silence: clamp(20vh, 24vh, 40vh);

  --gutter:      clamp(1rem, 0.6rem + 1.6vw, 2rem);
  --page-inline: clamp(1.25rem, 5vw, 6rem);
  --maxw:        min(1600px, 92vw);

  /* motion tokens */
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-in-out:    cubic-bezier(0.76, 0, 0.24, 1);
  --ease-elastic:   cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-1: 0.4s;
  --dur-2: 0.8s;
  --dur-3: 1.2s;

  --nav-h: clamp(3.75rem, 3rem + 2vw, 5.25rem);
}

/* ---------- b. RESET ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { min-height: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
button { background: none; border: 0; cursor: pointer; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
:where(a) { color: inherit; text-decoration: none; }

/* ---------- c. BASE ELEMENTS ---------- */
html { scroll-behavior: auto; }

body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--step-0);
  line-height: var(--lh-body-jp);
  font-feature-settings: normal; /* body JP stays full-width metrics */
  overflow-x: hidden;
  position: relative;
}

body.is-loading { overflow: hidden; height: 100vh; }

/* display + headings */
h1, h2, h3, .display {
  font-family: var(--font-mincho);
  font-weight: 900;
  line-height: var(--lh-display-jp);
  letter-spacing: 0.01em;
  font-feature-settings: "palt" 1;
  word-break: keep-all;
}
h1 { font-size: var(--step-display); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-family: var(--font-body); font-weight: 700; font-size: var(--step-1); line-height: 1.4; }

.display-latin {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: var(--lh-display-latin);
  letter-spacing: -0.03em;
}

p { max-width: 62ch; }
p + p { margin-top: var(--space-3); }
strong { font-weight: 700; }

/* small caps labels */
.label, .eyebrow {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  line-height: var(--lh-label);
  color: var(--color-muted);
}

/* links — underline draws in from the left */
a.link, .prose a, .link-underline {
  position: relative;
  display: inline;
  background-image: linear-gradient(var(--accent-live), var(--accent-live));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1.5px;
  transition: background-size var(--dur-1) var(--ease-out-quart), color var(--dur-1) var(--ease-out-quart);
}
a.link:hover, a.link:focus-visible,
.prose a:hover, .prose a:focus-visible,
.link-underline:hover, .link-underline:focus-visible {
  background-size: 100% 1.5px;
  color: color-mix(in srgb, var(--color-fg) 82%, var(--accent-live));
}

/* selection — 飴色地に粉引文字 */
::selection { background: var(--color-accent); color: var(--color-bg); }
::-moz-selection { background: var(--color-accent); color: var(--color-bg); }

/* focus */
:focus-visible {
  outline: 2px solid var(--accent-live);
  outline-offset: 3px;
  border-radius: 1px;
}

/* scrollbar */
html { scrollbar-width: thin; scrollbar-color: var(--color-muted) transparent; }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--color-muted) 70%, transparent);
  border-radius: 20px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-muted); background-clip: content-box; }

/* ---------- d. GRAIN OVERLAY (no extra markup) ---------- */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9000;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
  background-size: 240px 240px;
}

/* ---------- e. UTILITIES + COMPONENTS ---------- */

/* grid + containers */
.container {
  width: var(--maxw);
  max-width: 100%;
  margin-inline: auto;
  padding-inline: 0;
}
.inset { padding-inline: var(--page-inline); }
.full-bleed { width: 100%; margin-inline: 0; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gutter);
  row-gap: var(--space-4);
}
@media (max-width: 720px) {
  .grid-12 { grid-template-columns: repeat(6, 1fr); }
}

/* column span helpers */
.col-1-7   { grid-column: 1 / 8; }
.col-8-12  { grid-column: 8 / 13; }
.col-1-6   { grid-column: 1 / 7; }
.col-7-12  { grid-column: 7 / 13; }
.col-1-5   { grid-column: 1 / 6; }
.col-8-13  { grid-column: 8 / 13; }
.col-full  { grid-column: 1 / -1; }
@media (max-width: 720px) {
  .col-1-7, .col-8-12, .col-1-6, .col-7-12, .col-1-5, .col-8-13 { grid-column: 1 / -1; }
}

/* sections + silence */
section { position: relative; }
.scene { padding-block: var(--space-6); }
.silence { height: var(--silence); }

/* glaze fields */
.field-ruri   { background: var(--ruri);  color: var(--color-bg); }
.field-oribe  { background: var(--oribe); color: var(--color-bg); }
.field-tetsu  { background: var(--tetsu); color: var(--color-bg); }
.field-kohiki { background: var(--kohiki); color: var(--color-fg); }
.glaze-panel {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(120% 90% at 20% 10%, color-mix(in srgb, #fff 22%, transparent), transparent 55%),
    conic-gradient(from 200deg at 70% 80%, color-mix(in srgb, #000 30%, transparent), transparent 40%),
    linear-gradient(160deg, var(--ruri), color-mix(in srgb, var(--ruri) 60%, var(--tetsu)));
}

/* hairline rules */
.hairline { border: 0; border-top: 1px solid var(--fg-12); width: 100%; }
.hairline-heavy { border: 0; border-top: 3px solid var(--color-fg); width: 100%; }
.row-hairline { border-bottom: 1px solid var(--fg-12); }

/* oversized index numbers */
.index-huge {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--step-4);
  line-height: 0.8;
  color: var(--fg-15);
  letter-spacing: -0.02em;
}
.index-mono {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  color: var(--color-muted);
}

/* outlined ornamental type */
.ghost-word {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px var(--fg-15);
  letter-spacing: -0.03em;
  pointer-events: none;
  user-select: none;
}
.ghost-word.solid { -webkit-text-stroke: 0; color: var(--fg-04); }

/* vertical accent text */
.vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-feature-settings: "palt" 1;
  letter-spacing: 0.08em;
}

/* marquee (CSS-only) */
.marquee {
  --marquee-dur: 28s;
  overflow: hidden;
  width: 100%;
  display: flex;
  white-space: nowrap;
  user-select: none;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
          mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.marquee-track {
  display: flex;
  flex-shrink: 0;
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-right: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  animation: marquee-scroll var(--marquee-dur) linear infinite;
  will-change: transform;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--step-0);
  padding: 0.85em 1.6em;
  border: 1px solid var(--color-fg);
  border-radius: 100px;
  color: var(--color-fg);
  background: transparent;
  transition: background var(--dur-1) var(--ease-out-quart), color var(--dur-1) var(--ease-out-quart);
}
.btn:hover, .btn:focus-visible { background: var(--accent-live); border-color: var(--accent-live); color: var(--color-bg); }
.btn .arrow { transition: transform var(--dur-1) var(--ease-out-expo); }
.btn:hover .arrow { transform: translateX(0.35em); }

/* reveal initial states (JS toggles visible) */
[data-reveal] { opacity: 0; }
.reveal-mask { overflow: hidden; }
.split-line { display: block; overflow: hidden; }
.split-word { display: inline-block; overflow: hidden; vertical-align: top; }
.split-char, .split-unit { display: inline-block; will-change: transform; }

/* visually hidden */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* custom cursor */
.cursor, .cursor-ring {
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9500;
  border-radius: 50%;
  mix-blend-mode: difference;
  will-change: transform;
}
.cursor {
  width: 7px; height: 7px;
  margin: -3.5px 0 0 -3.5px;
  background: var(--color-bg);
}
.cursor-ring {
  width: 34px; height: 34px;
  margin: -17px 0 0 -17px;
  border: 1px solid var(--color-muted);
  transition: width 0.3s var(--ease-out-expo), height 0.3s var(--ease-out-expo),
              margin 0.3s var(--ease-out-expo), background 0.3s var(--ease-out-expo),
              border-color 0.3s var(--ease-out-expo);
}
.cursor-ring.is-hover {
  width: 60px; height: 60px;
  margin: -30px 0 0 -30px;
  background: color-mix(in srgb, var(--color-accent) 30%, transparent);
  border-color: var(--color-accent);
  mix-blend-mode: normal;
}
@media (pointer: coarse) {
  .cursor, .cursor-ring { display: none !important; }
}

/* preloader */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 9800;
  display: grid;
  place-items: center;
  background: var(--tetsu);
  color: var(--kohiki);
}
#preloader .preloader-count {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--step-4);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
}
#preloader .preloader-count::after { content: ""; }
#preloader .preloader-label {
  position: absolute;
  bottom: clamp(1.5rem, 5vw, 3rem);
  left: var(--page-inline);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: var(--step--1);
  color: color-mix(in srgb, var(--kohiki) 60%, transparent);
}
#preloader .preloader-mark {
  position: absolute;
  top: clamp(1.5rem, 5vw, 3rem);
  right: var(--page-inline);
  font-family: var(--font-mincho);
  font-weight: 900;
  font-size: var(--step-1);
  color: var(--kohiki);
}

/* skip link */
.skip-link {
  position: absolute;
  left: 50%; top: -100px;
  transform: translateX(-50%);
  z-index: 9999;
  background: var(--color-fg);
  color: var(--color-bg);
  padding: 0.6em 1.2em;
  border-radius: 0 0 6px 6px;
  transition: top var(--dur-1) var(--ease-out-expo);
}
.skip-link:focus { top: 0; }

/* ---------- f. REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .marquee-track { animation: none !important; }
  [data-reveal] { opacity: 1 !important; }
  .cursor, .cursor-ring { display: none !important; }
  #preloader { display: none !important; }
}