/* pairPics — 黒を使わない配色。深い紺＋石の灰＋テラコッタの差し色 */
:root {
  --paper: #f1f0ec;
  --wall: #e1e2de;
  --card: #f9f8f5;
  --ink: #1e3a52;
  --muted: #5e6e7b;
  --brass: #b0573a;
  --hairline: rgba(30, 58, 82, 0.14);
  --shadow: 30, 58, 82;
  --forest-tint: #e4e9df;
  --museum-tint: #e4e4e2;
  --sea-tint: #e0eaf0;
  --serif-ja: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  --serif-en: "New York", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Helvetica Neue", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1a2b3c;
    --wall: #223649;
    --card: #263b50;
    --ink: #eef1ef;
    --muted: #a9b7c2;
    --brass: #e8946d;
    --hairline: rgba(238, 241, 239, 0.16);
    --shadow: 8, 20, 34;
    --forest-tint: #1c3032;
    --museum-tint: #232f3b;
    --sea-tint: #1a3148;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.9;
  font-size: 16px;
}
:lang(en) body, body:lang(en) { line-height: 1.7; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brass); text-underline-offset: 3px; }
a:hover { color: var(--ink); }

.serif { font-family: var(--serif-ja); }
:lang(en) .serif { font-family: var(--serif-en); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* ヘッダー */
.site-header { border-bottom: 1px solid var(--hairline); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
.brand span { font-family: var(--serif-en); font-style: italic; font-size: 20px; }
.lang { font-size: 13px; letter-spacing: 0.08em; color: var(--muted); }
.lang a, .lang strong { color: var(--muted); text-decoration: none; padding: 4px 6px; }
.lang strong { color: var(--ink); font-weight: 500; }

/* ヒーロー */
.hero { padding: 72px 0 56px; }
.hero .wrap { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.eyebrow { font-family: var(--serif-en); font-size: 12px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--brass); margin: 0 0 18px; }
.hero h1 { font-family: var(--serif-ja); font-weight: 600; font-size: clamp(34px, 5vw, 52px); line-height: 1.45; letter-spacing: 0.04em; margin: 0 0 22px; }
:lang(en) .hero h1 { font-family: var(--serif-en); font-weight: 500; letter-spacing: 0; line-height: 1.2; }
.hero p.lead { color: var(--muted); margin: 0 0 32px; max-width: 30em; }
.icon-large { width: 88px; height: 88px; border-radius: 20px; box-shadow: 0 10px 30px rgba(var(--shadow),0.18); margin-bottom: 28px; }
.hero-art { background: var(--wall); box-shadow: 0 2px 4px rgba(var(--shadow),0.08), 0 24px 60px rgba(var(--shadow),0.14); }
/* 3D の壁（three.js）。読み込むまでは静止画を見せ、描けたら重ねる */
.hero-stage { position: relative; aspect-ratio: 4 / 5; overflow: hidden; background: var(--wall);
  box-shadow: 0 2px 4px rgba(var(--shadow),0.08), 0 24px 60px rgba(var(--shadow),0.14); cursor: pointer; }
.hero-stage img { width: 100%; height: 100%; object-fit: cover; }
.hero-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity 0.9s ease; }
.hero-stage.is-3d canvas { opacity: 1; }
.hero-stage img { transition: opacity 0.6s ease; }
.hero-stage.is-3d img { opacity: 0; }
.store-button {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--ink); color: var(--paper); text-decoration: none;
  padding: 14px 26px; border-radius: 4px; font-size: 15px; letter-spacing: 0.06em;
}
.store-button:hover { color: var(--paper); opacity: 0.86; }
.store-note { display: block; margin-top: 12px; font-size: 12px; color: var(--muted); }

/* セクション */
section { padding: 64px 0; border-top: 1px solid var(--hairline); }
section h2 { font-family: var(--serif-ja); font-weight: 600; font-size: clamp(24px, 3.4vw, 32px); letter-spacing: 0.05em; margin: 0 0 12px; }
:lang(en) section h2 { font-family: var(--serif-en); font-weight: 500; letter-spacing: 0; }
section .intro { color: var(--muted); margin: 0 0 40px; max-width: 36em; }

/* 3つのギャラリー */
.galleries-intro { padding-bottom: 32px; }
.g-nav { display: flex; flex-wrap: wrap; gap: 10px; }
.g-nav a { display: inline-flex; align-items: baseline; gap: 10px; padding: 10px 18px; border: 1px solid var(--hairline); border-radius: 999px;
  color: var(--ink); text-decoration: none; font-size: 15px; background: var(--card); transition: border-color .2s, transform .2s; }
.g-nav a span { font-family: var(--serif-en); color: var(--brass); font-size: 12px; letter-spacing: 0.12em; }
.g-nav a:hover { border-color: var(--brass); transform: translateY(-1px); }

.gallery { --tint: var(--paper); background: linear-gradient(180deg, var(--tint), var(--paper) 85%); }
.gallery-forest { --tint: var(--forest-tint); }
.gallery-museum { --tint: var(--museum-tint); }
.gallery-sea { --tint: var(--sea-tint); }
.g-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.gallery:nth-of-type(odd) .g-stage { order: 2; }
.g-stage { position: relative; aspect-ratio: 4 / 5; overflow: hidden; border-radius: 6px; background: var(--wall);
  box-shadow: 0 2px 4px rgba(var(--shadow),0.08), 0 30px 70px rgba(var(--shadow),0.22); touch-action: pan-y; }
.g-stage img { width: 100%; height: 100%; object-fit: cover; transition: opacity 0.8s ease; }
.g-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity 1s ease; }
.g-stage.is-3d canvas { opacity: 1; }
.g-stage.is-3d img { opacity: 0; }
.g-hint { position: absolute; left: 14px; bottom: 14px; padding: 6px 12px; border-radius: 999px; font-size: 11px; letter-spacing: 0.06em;
  color: #f4f6f7; background: rgba(30, 58, 82, 0.55); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  opacity: 0; transition: opacity .6s ease .8s; pointer-events: none; }
.g-stage.is-3d .g-hint { opacity: 1; }
.g-lights { position: absolute; top: 14px; right: 14px; display: flex; gap: 4px; padding: 4px; border-radius: 999px;
  background: rgba(244, 246, 247, 0.72); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); opacity: 0; transition: opacity .6s; }
.g-stage.is-3d .g-lights { opacity: 1; }
.g-lights button { border: 0; background: transparent; color: #1e3a52; font: inherit; font-size: 12px; padding: 6px 12px; border-radius: 999px; cursor: pointer; }
.g-lights button[aria-pressed="true"] { background: #1e3a52; color: #f4f6f7; }
.g-text .eyebrow { margin-bottom: 12px; }
.g-text .lead { color: var(--muted); margin: 0 0 24px; }
.g-points { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.g-points li { position: relative; padding-left: 22px; font-size: 15px; }
.g-points li::before { content: ""; position: absolute; left: 0; top: 0.8em; width: 12px; height: 1px; background: var(--brass); }
.g-plates { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 48px; }
.g-plates figure { margin: 0; }
.g-plates img { border-radius: 4px; box-shadow: 0 10px 30px rgba(var(--shadow),0.14); transition: transform .4s ease, box-shadow .4s ease; }
.g-plates figure:hover img { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(var(--shadow),0.2); }
.g-plates figcaption { margin-top: 10px; font-size: 13px; color: var(--muted); letter-spacing: 0.04em; }

/* スクリーンショット */
.screens { display: flex; gap: 20px; overflow-x: auto; padding: 4px 24px 24px; margin: 0 -24px; scroll-snap-type: x mandatory; }
.screens img { width: 240px; flex: 0 0 auto; border-radius: 18px; scroll-snap-align: start; box-shadow: 0 10px 30px rgba(var(--shadow),0.12); }

/* 特長 */
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px 36px; }
.feature h3 { font-family: var(--serif-ja); font-weight: 600; font-size: 18px; letter-spacing: 0.04em; margin: 0 0 8px; }
:lang(en) .feature h3 { font-family: var(--serif-en); font-weight: 500; letter-spacing: 0; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
.feature .num { font-family: var(--serif-en); color: var(--brass); font-size: 14px; letter-spacing: 0.1em; display: block; margin-bottom: 6px; }

/* 使い方 */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; display: grid; gap: 18px; max-width: 40em; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 44px 1fr; align-items: baseline; }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: var(--serif-en); color: var(--brass); font-size: 15px; }

/* 文書ページ（プライバシーポリシー） */
.doc { padding: 56px 0 80px; }
.doc .wrap { max-width: 760px; }
.doc h1 { font-family: var(--serif-ja); font-weight: 600; font-size: clamp(28px, 4vw, 38px); letter-spacing: 0.04em; margin: 0 0 8px; }
:lang(en) .doc h1 { font-family: var(--serif-en); font-weight: 500; letter-spacing: 0; }
.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 40px; }
.doc h2 { font-family: var(--serif-ja); font-weight: 600; font-size: 20px; letter-spacing: 0.03em; margin: 44px 0 10px; padding-top: 24px; border-top: 1px solid var(--hairline); }
:lang(en) .doc h2 { font-family: var(--serif-en); font-weight: 500; letter-spacing: 0; }
.doc ul { padding-left: 1.2em; }
.doc li { margin: 4px 0; }

/* フッター */
.site-footer { border-top: 1px solid var(--hairline); padding: 36px 0 48px; color: var(--muted); font-size: 13px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
.site-footer nav { display: flex; gap: 22px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

@media (max-width: 760px) {
  .hero { padding: 44px 0 36px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 36px; }
  .features { grid-template-columns: 1fr; gap: 28px; }
  .g-grid { grid-template-columns: 1fr; gap: 28px; }
  .gallery:nth-of-type(odd) .g-stage { order: 0; }
  .g-plates { grid-template-columns: repeat(3, 70%); overflow-x: auto; scroll-snap-type: x mandatory; margin: 32px -24px 0; padding: 0 24px 12px; gap: 14px; }
  .g-plates figure { scroll-snap-align: start; }
  section { padding: 48px 0; }
  .screens img { width: 200px; }
}