/* モーションは main.js が rAF ループで CSS 変数（--sp, --hp, --p, --d, --a, --rot）を更新し、CSS 側でそれを読む構成。
   非表示の初期状態は .js 配下に限定し、JS 無効時も全コンテンツが見えるようにしている。 */

:root {
  --bg: #f3f1ec;
  --fg: #151514;
  --muted: #74706a;
  --line: rgba(21, 21, 20, .12);
  --accent: #9a7b4f;
  --ease: cubic-bezier(.2, .7, 0, 1);
  --ease-io: cubic-bezier(.65, 0, .35, 1);
  --gutter: clamp(16px, 5vw, 64px);
  --font-serif: "Cormorant Garamond", serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0e;
    --fg: #ebe8e2;
    --muted: #8f8b84;
    --line: rgba(235, 232, 226, .12);
    --accent: #c4a77a;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter Tight", "Noto Sans JP", "Hiragino Sans", system-ui, sans-serif;
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
a { color: inherit; }
::selection { background: var(--fg); color: var(--bg); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- 固定 UI（difference ブレンドで背景を問わず読める） ---------- */
.progress {
  position: fixed; inset: 0 0 auto; z-index: 60; height: 2px;
  background: #fff; mix-blend-mode: difference; pointer-events: none;
  transform-origin: 0 50%; transform: scaleX(var(--sp, 0));
}
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px var(--gutter);
  color: #fff; mix-blend-mode: difference;
}
.logo { font-weight: 500; font-size: .95rem; letter-spacing: .16em; text-decoration: none; }
.site-header nav { display: flex; gap: 2.25rem; font-size: .7rem; letter-spacing: .2em; text-transform: uppercase; }
.site-header nav a { position: relative; text-decoration: none; }
.site-header nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: 100% 50%; transition: transform .6s var(--ease);
}
.site-header nav a:hover::after { transform: scaleX(1); transform-origin: 0 50%; }

.menu-btn {
  display: none; padding: 0; border: 0; background: none; color: inherit; cursor: pointer;
  font: inherit; font-size: .7rem; letter-spacing: .2em; text-transform: uppercase;
}
.menu {
  inset: 0; width: 100%; height: 100%; max-width: none; max-height: none; margin: 0;
  padding: 0 var(--gutter); border: 0; background: var(--bg); color: var(--fg);
  opacity: 0; transition: opacity .5s var(--ease), display .5s allow-discrete, overlay .5s allow-discrete;
}
.menu:popover-open { display: flex; flex-direction: column; justify-content: center; gap: .3em; opacity: 1; }
@starting-style { .menu:popover-open { opacity: 0; } }
.menu-close { display: block; position: absolute; top: 22px; right: var(--gutter); line-height: 1.9; }
.menu a {
  display: flex; align-items: baseline; gap: .7em; text-decoration: none;
  font-weight: 200; font-size: clamp(2.4rem, 11vw, 3.5rem); line-height: 1.35; letter-spacing: -.02em;
}
.menu a span { font-size: .72rem; font-weight: 400; letter-spacing: .2em; color: var(--muted); }
.menu:popover-open a { animation: menu-in .9s var(--ease) both; animation-delay: calc(var(--i) * 60ms + .08s); }
@keyframes menu-in { from { opacity: 0; transform: translate3d(0, 24px, 0); } }

/* ---------- 共通 ---------- */
.sec-head {
  display: flex; align-items: center; gap: 1.25rem;
  margin-bottom: clamp(40px, 8vh, 88px);
  font-size: .7rem; letter-spacing: .3em; text-transform: uppercase; color: var(--muted);
}
.sec-head .no { color: var(--fg); font-variant-numeric: tabular-nums; }
.sec-head .rule {
  flex: 0 0 clamp(48px, 8vw, 120px); height: 1px; background: currentColor;
  transform-origin: 0 50%; transition: transform 1.4s var(--ease) .15s;
}
.sec-head h2 { margin: 0; font: inherit; }
.sec-head .jp { margin-left: 1.25em; letter-spacing: .2em; }
.js .sec-head .rule { transform: scaleX(0); }
.js .sec-head.is-in .rule { transform: none; }

.js [data-reveal] {
  opacity: 0; transform: translate3d(0, 28px, 0);
  transition: opacity 1.2s var(--ease), transform 1.2s var(--ease);
  transition-delay: calc(var(--i, 0) * 90ms);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative; height: 100svh; min-height: 560px;
  display: flex; align-items: flex-end; overflow: hidden;
}
.field {
  position: absolute; inset: 0; width: 100%; height: 100%;
  mask-image: linear-gradient(to bottom, transparent, #000 20%, #000 72%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 20%, #000 72%, transparent);
  transform: translate3d(0, calc(var(--hp, 0) * 18vh), 0);
}
.hero-inner {
  position: relative; width: 100%; max-width: 1200px; margin: 0 auto;
  padding: 0 var(--gutter) clamp(64px, 13vh, 132px);
}
.eyebrow {
  display: flex; align-items: center; gap: .9em; margin: 0 0 2rem;
  font-size: .68rem; letter-spacing: .3em; text-transform: uppercase; color: var(--muted);
}
.eyebrow .dot { flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2.4s var(--ease-io) infinite; }
@keyframes pulse { 50% { opacity: .25; } }

.display {
  margin: 0 0 2.25rem;
  font-weight: 200; font-size: clamp(3rem, 10.5vw, 9.5rem); line-height: .98; letter-spacing: -.035em;
}
.display .line {
  display: block; overflow: hidden; padding-bottom: .08em;
  transform: translate3d(calc(var(--hp, 0) * var(--dir) * 14vw), 0, 0);
  opacity: calc(1 - var(--hp, 0) * 1.3);
}
.display .line:nth-child(1) { --dir: -1; }
.display .line:nth-child(2) { --dir: .7; padding-left: 1.2em; }
.display .line:nth-child(3) { --dir: -.35; }
.display .line > span { display: inline-block; transition: transform 1.5s var(--ease); }
.display .line:nth-child(2) > span { transition-delay: .1s; }
.display .line:nth-child(3) > span { transition-delay: .2s; }
.display em { font-family: var(--font-serif); font-style: italic; font-weight: 300; letter-spacing: -.01em; }
.js .display .line > span { transform: translate3d(0, 108%, 0); }
.js.loaded .display .line > span { transform: none; }

.lead { margin: 0; font-size: clamp(.95rem, 1.35vw, 1.15rem); font-weight: 400; line-height: 1.9; letter-spacing: .1em; }
.js .eyebrow, .js .lead { opacity: 0; transform: translate3d(0, 14px, 0); transition: opacity 1.2s var(--ease), transform 1.2s var(--ease); }
.js.loaded .eyebrow { opacity: 1; transform: none; transition-delay: .5s; }
.js.loaded .lead { opacity: 1; transform: none; transition-delay: .75s; }

.scroll-cue {
  position: absolute; right: var(--gutter); bottom: clamp(64px, 13vh, 132px);
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  font-size: .62rem; letter-spacing: .3em; text-transform: uppercase; color: var(--muted);
}
.scroll-cue span { writing-mode: vertical-rl; }
.scroll-cue i { position: relative; width: 1px; height: 72px; overflow: hidden; background: var(--line); }
.scroll-cue i::after {
  content: ""; position: absolute; inset: 0; background: var(--fg);
  animation: cue 2.4s var(--ease-io) infinite;
}
@keyframes cue { 0% { transform: translateY(-100%); } 50% { transform: none; } 100% { transform: translateY(100%); } }

/* ---------- Philosophy ---------- */
.statement { padding: clamp(120px, 24vh, 260px) 0; }
.statement-text {
  max-width: 24em; margin: 0;
  font-size: clamp(1.35rem, 3.2vw, 2.5rem); line-height: 1.8; letter-spacing: .04em;
}
/* 読み進めた位置まで 1 文字ずつ点灯（10 文字分のグラデーション幅） */
/* 日本語の文節単位で改行させる */
.ph { display: inline-block; }
.js .statement-text .ch { opacity: clamp(.13, calc((var(--p, 0) * (var(--n) + 10) - var(--i)) / 10), 1); }

/* ---------- Services（sticky スクロールテリング） ---------- */
.services-stage { padding: 96px 0; }
.js .services { height: 340vh; }
.js .services-stage { position: sticky; top: 0; height: 100svh; padding: 0; display: flex; align-items: center; overflow: hidden; }
.services-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(32px, 6vw, 96px); align-items: center; }
.services .sec-head { margin-bottom: clamp(24px, 5vh, 56px); }

.svc-index {
  display: flex; align-items: flex-start; gap: .6rem; margin-bottom: clamp(20px, 4vh, 44px);
  font-weight: 200; font-size: clamp(3.5rem, 8vw, 7.5rem); line-height: 1; letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
}
.svc-num { display: block; height: 1em; overflow: hidden; }
.svc-num-track { display: flex; flex-direction: column; transform: translate3d(0, calc(var(--a, 0) * -1em), 0); transition: transform 1.1s var(--ease); }
.svc-total { padding-top: .9rem; font-size: .75rem; font-weight: 400; letter-spacing: .2em; color: var(--muted); }

.svc-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.svc { padding: 18px 0; border-bottom: 1px solid var(--line); transition: opacity .7s var(--ease); }
.svc h3 {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1em; margin: 0;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem); font-weight: 400; letter-spacing: .08em;
}
.svc h3 small { font-size: .65rem; font-weight: 400; letter-spacing: .24em; text-transform: uppercase; color: var(--muted); }
.svc .body { display: grid; transition: grid-template-rows .9s var(--ease); }
.svc .body > div { min-height: 0; overflow: hidden; }
.svc .body p { margin: 0; padding-top: 10px; font-size: .92rem; color: var(--muted); }
.js .svc { opacity: .3; }
.js .svc.is-active { opacity: 1; }
.js .svc .body { grid-template-rows: 0fr; }
.js .svc.is-active .body { grid-template-rows: 1fr; }

.svc-art { position: relative; justify-self: center; width: 100%; max-width: 540px; aspect-ratio: 1; }
/* 製図の角トンボ */
.svc-art::before {
  content: ""; position: absolute; inset: 0; opacity: .45; pointer-events: none;
  --c: linear-gradient(var(--fg), var(--fg));
  background:
    var(--c) 0 0 / 16px 1px no-repeat, var(--c) 0 0 / 1px 16px no-repeat,
    var(--c) 100% 0 / 16px 1px no-repeat, var(--c) 100% 0 / 1px 16px no-repeat,
    var(--c) 0 100% / 16px 1px no-repeat, var(--c) 0 100% / 1px 16px no-repeat,
    var(--c) 100% 100% / 16px 1px no-repeat, var(--c) 100% 100% / 1px 16px no-repeat;
}
.svc-art::after {
  content: "Fig. " attr(data-fig); position: absolute; right: 0; bottom: -2.2em;
  font-size: .65rem; letter-spacing: .3em; text-transform: uppercase; color: var(--muted);
}
.art {
  position: absolute; inset: 8%; width: 84%; height: 84%;
  fill: none; stroke: var(--fg); stroke-width: .9;
  opacity: 0; transform: scale(.95);
  transition: opacity .9s var(--ease), transform 1.4s var(--ease);
}
.art.is-active { opacity: 1; transform: none; }
.art .draw {
  --d-local: clamp(0, (var(--d, 1.6) - var(--k, 0) * .07) * 1.7, 1);
  stroke-dasharray: 1px 1px;
  stroke-dashoffset: calc((1 - var(--d-local)) * 1px);
}
.art .accent { stroke: var(--accent); }
.art .node { fill: var(--fg); stroke: none; opacity: clamp(0, (var(--d, 1.6) - .55) * 3, 1); }
.art .node.accent { fill: var(--accent); }
.art .spin, .art .sweep { transform-box: view-box; transform-origin: 50% 50%; }
.art .spin { transform: rotate(calc(var(--d, 0) * 40deg)); }
.art .sweep { transform: rotate(calc(var(--d, 0) * 220deg)); }

/* ---------- 製品ページへのリンク ---------- */
.svc .more { display: inline-block; margin-top: 10px; font-size: .78rem; letter-spacing: .14em; color: var(--fg); text-decoration: none; border-bottom: 1px solid currentColor; }

/* ---------- Profile ---------- */
.profile { padding: clamp(120px, 22vh, 240px) 0 clamp(100px, 16vh, 180px); }
.profile-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: clamp(32px, 6vw, 96px); }
.profile-aside { position: relative; }
.badge { display: block; width: clamp(120px, 14vw, 180px); margin-top: 8px; overflow: visible; }
.badge text { fill: var(--muted); font-size: 10.5px; letter-spacing: .1em; font-weight: 400; }
.badge-rot { transform-origin: 100px 100px; transform: rotate(calc(var(--rot, 0) * 1deg)); }
.badge-dot { fill: var(--accent); }

.facts { margin: 0; border-top: 1px solid var(--line); }
.fact { position: relative; display: grid; grid-template-columns: 9em 1fr; gap: 1em; padding: 22px 0; }
.fact::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--line);
  transform-origin: 0 50%; transition: transform 1.6s var(--ease) calc(var(--i, 0) * 90ms + .15s);
}
.js .fact::after { transform: scaleX(0); }
.js .fact.is-in::after { transform: none; }
.fact dt { padding-top: .3em; font-size: .72rem; letter-spacing: .2em; color: var(--muted); }
.fact dd { margin: 0; }

/* ---------- Contact ---------- */
.contact { padding: clamp(60px, 10vh, 120px) 0 clamp(100px, 16vh, 180px); overflow: hidden; }
.marquee {
  margin-bottom: clamp(56px, 12vh, 140px); white-space: nowrap;
  font-weight: 200; font-size: clamp(4rem, 13vw, 12rem); line-height: 1.15; letter-spacing: -.035em;
}
.marquee-track { display: inline-flex; will-change: transform; }
.marquee span { padding-right: .3em; color: color-mix(in srgb, var(--fg) 14%, transparent); }
.marquee em { font-family: var(--font-serif); font-weight: 300; color: var(--fg); }
.contact-note { margin: 0 0 1.5rem; color: var(--muted); }
.mail {
  position: relative; display: inline-flex; align-items: center; gap: .5em; padding-bottom: .12em;
  font-size: clamp(1.5rem, 4.6vw, 3.6rem); font-weight: 300; letter-spacing: -.01em; text-decoration: none;
}
.mail::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 100%; height: 1px; background: currentColor;
}
.mail:hover::after { animation: wipe 1s var(--ease-io); }
@keyframes wipe {
  0% { transform: scaleX(1); transform-origin: 100% 50%; }
  50% { transform: scaleX(0); transform-origin: 100% 50%; }
  50.1% { transform: scaleX(0); transform-origin: 0 50%; }
  100% { transform: scaleX(1); transform-origin: 0 50%; }
}
.mail svg { width: .6em; height: .6em; fill: none; stroke: currentColor; stroke-width: 1.2; transition: transform .7s var(--ease); }
.mail:hover svg { transform: translate(.12em, -.12em); }

/* ---------- Footer ---------- */
.site-footer { overflow: hidden; border-top: 1px solid var(--line); }
.footer-bar { display: flex; justify-content: space-between; padding-top: 28px; padding-bottom: 28px; font-size: .72rem; letter-spacing: .16em; color: var(--muted); }
.footer-bar a { text-decoration: none; }
.footer-bar a:hover { color: var(--fg); }
.footer-mark {
  margin-bottom: -.1em; text-align: center; white-space: nowrap;
  font-weight: 200; font-size: 24vw; line-height: 1; letter-spacing: -.05em;
  transform: translate3d(0, calc((1 - var(--p, 1)) * 45%), 0);
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 860px) {
  .site-header nav, .scroll-cue { display: none; }
  .menu-btn { display: block; }
  .services-grid { grid-template-columns: 1fr; }
  /* 狭い画面では図版を背景に薄く敷き、本文の高さを確保する */
  .svc-art { position: absolute; top: 50%; left: 50%; width: min(110vw, 80svh); max-width: none; transform: translate(-50%, -50%); opacity: .16; z-index: -1; }
  .svc-art::after { display: none; }
  .profile-grid { grid-template-columns: 1fr; }
  .badge { position: absolute; right: 0; top: -132px; width: 104px; }
  .eyebrow-sub { display: none; }
  .fact { grid-template-columns: 6.5em 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; transition-delay: 0s !important; }
  .js [data-reveal], .js .eyebrow, .js .lead { opacity: 1; transform: none; }
  .js .display .line > span, .display .line, .field, .footer-mark { transform: none; opacity: 1; }
  .js .statement-text .ch { opacity: 1; }
  .js .sec-head .rule, .js .fact::after { transform: none; }
}