/* ============================================================
   ジェイのAI — Portfolio of Observations
   Design language: 白い実験室 / scientific plate editorial
   Palette: paper white × mustard gold (Envision) × ink
   ============================================================ */

:root{
  /* ライトテーマの既定値。テーマ切替は js/night.js（THEMEトグル）で .theme-dark を付け外し */
  --serif:'Shippori Mincho',"Hiragino Mincho ProN",serif;
  --sans:'Zen Kaku Gothic New',"Hiragino Kaku Gothic ProN",sans-serif;
  --grot:'Space Grotesk','Zen Kaku Gothic New',sans-serif;
  --pad:clamp(20px,4vw,64px);
  --ease-out:cubic-bezier(.22,1,.36,1);
  --paper:#FCFDFF;
  --paper-2:#F4F7FC;
  --white:#FFFFFF;
  --ink:#1C1B18;
  --ink-2:#57534A;
  --ink-3:#8F887B;
  --paper-rgb:252,253,255;
  --paper2-rgb:244,247,252;
  --white-rgb:255,255,255;
  --gold:#F0C000;
  --gold-text:#C49500;
  --gold-deep:#8A6D00;
  --gold-hi:#F7D040;
  --hairline:rgba(28,27,24,.16);
  --hairline-strong:rgba(28,27,24,.4);
  --grain-o:1;
}

/* ダークテーマ（ページ単位切替・ヘッダーのTHEMEトグル＋localStorageで記憶） */
.theme-dark{
  --paper:#11111C;
  --paper-2:#16151F;
  --white:#1D1B26;
  --ink:#F2EDE0;
  --ink-2:#B5AF9E;
  --ink-3:#807B6E;
  --paper-rgb:17,17,28;
  --paper2-rgb:22,21,31;
  --white-rgb:29,27,38;
  --gold-text:#E3BC3F;
  --hairline:rgba(242,237,224,.16);
  --hairline-strong:rgba(242,237,224,.4);
  --grain-o:.12;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
html.lenis{height:auto;scroll-behavior:auto}
.lenis.lenis-smooth{scroll-behavior:auto}

body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.9;
  letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
/* subtle paper grain */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:1;
  background-image:radial-gradient(rgba(28,27,24,.028) 1px,transparent 1px);
  background-size:3px 3px;
  mix-blend-mode:multiply;
  opacity:var(--grain-o);
}

/* 貫通粒子空間（全ページ固定背景） */
#space-canvas{position:fixed;inset:0;z-index:0;width:100%;height:100%;pointer-events:none}

::selection{background:var(--gold);color:var(--ink)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.grot{font-family:var(--grot);letter-spacing:.14em;font-weight:400}
.gold{color:var(--gold-text)}

/* ---------- custom cursor ---------- */
.cursor{position:fixed;left:0;top:0;z-index:9999;pointer-events:none;opacity:0;
  transform:translate(-50%,-50%);transition:opacity .3s}
.cursor-dot{display:block;width:10px;height:10px;border-radius:50%;
  background:var(--gold);outline:1px solid var(--gold-deep);
  transition:width .25s var(--ease-out),height .25s var(--ease-out),background .25s,outline-offset .25s}
.cursor-label{position:absolute;left:16px;top:-4px;font-family:var(--grot);font-size:10px;
  letter-spacing:.22em;color:var(--gold-deep);white-space:nowrap;opacity:0;transition:opacity .25s}
.cursor.is-observe .cursor-dot{width:34px;height:34px;background:transparent;
  outline:1px solid var(--gold-deep);outline-offset:0}
.cursor.is-observe .cursor-label{opacity:1}
.cursor.is-link .cursor-dot{width:20px;height:20px;background:var(--gold-hi)}
@media (pointer:coarse){.cursor{display:none}}
body.has-cursor{cursor:none}
body.has-cursor a,body.has-cursor button{cursor:none}

/* ---------- header ---------- */
.site-head{
  position:fixed;inset:0 0 auto 0;z-index:300;
  display:flex;align-items:baseline;gap:2em;
  padding:18px var(--pad) 20px;
  /* スクロールで下を通る要素と重ならないよう、ヘッダー帯だけ背景を沈める */
  background:linear-gradient(180deg,rgba(var(--paper-rgb),.82) 0%,rgba(var(--paper-rgb),.55) 62%,rgba(var(--paper-rgb),0) 100%);
  backdrop-filter:blur(7px);
  -webkit-backdrop-filter:blur(7px);
}
.wordmark{font-family:var(--serif);font-weight:600;font-size:20px;letter-spacing:.08em}
.head-meta{font-size:10px;color:var(--ink-2);letter-spacing:.2em;flex:1}
.head-sep{margin:0 1em;color:var(--gold-text)}
.menu-btn{
  font-size:11px;letter-spacing:.26em;background:none;border:0;color:var(--ink);
  display:flex;align-items:center;gap:.7em;padding:.2em 0;
}
.menu-tick{width:26px;height:1px;background:var(--ink);display:block;position:relative;transition:transform .3s}
.menu-tick::after{content:"";position:absolute;left:0;top:5px;width:16px;height:1px;background:var(--gold-text);transition:width .3s}
.menu-btn:hover .menu-tick::after{width:26px}
@media (max-width:1000px){.head-meta{display:none}.site-head{justify-content:space-between}}

/* ---------- index menu overlay ---------- */
.index-menu{
  position:fixed;inset:0;z-index:200;background:var(--paper);
  display:flex;flex-direction:column;justify-content:center;
  padding:0 var(--pad);
  clip-path:inset(0 0 100% 0);
  visibility:hidden;
  transition:clip-path .65s var(--ease-out),visibility 0s .65s;
}
.index-menu.is-open{clip-path:inset(0 0 0 0);visibility:visible;transition:clip-path .65s var(--ease-out)}
.index-list{list-style:none;max-width:820px;width:100%;margin:0 auto}
.index-list li{border-top:1px solid var(--hairline)}
.index-list li:last-child{border-bottom:1px solid var(--hairline)}
.index-list a{
  display:flex;align-items:baseline;gap:1.2em;
  font-family:var(--serif);font-size:clamp(26px,5vw,44px);font-weight:500;
  padding:.42em 0;transition:padding-left .35s var(--ease-out),color .3s;
}
.index-list a:hover{padding-left:.6em;color:var(--gold-deep)}
.index-list a span{font-size:12px;color:var(--gold-text);letter-spacing:.2em}
.index-list a em{font-style:normal;font-size:11px;color:var(--ink-3);letter-spacing:.24em;margin-left:auto}
.index-foot{position:absolute;bottom:26px;left:var(--pad);font-size:10px;letter-spacing:.3em;color:var(--ink-3)}

/* ---------- reveal（ピントが合うように現れる） ---------- */
[data-reveal]{opacity:0;transform:translateY(26px);filter:blur(9px);
  transition:opacity 1s var(--ease-out),transform 1s var(--ease-out),filter 1.1s var(--ease-out)}
[data-reveal].is-in{opacity:1;transform:none;filter:blur(0)}

/* ---------- 浮遊（無重力ドリフト） ---------- */
@keyframes floaty{
  0%{transform:translate3d(0,0,0)}
  50%{transform:translate3d(0,-7px,0)}
  100%{transform:translate3d(0,3px,0)}
}
[data-float]{animation:floaty 7.5s ease-in-out infinite alternate}

/* ---------- シェブロン地紋（ループ幾何学・勾配51.8°） ---------- */
/* Phase 23: #gate は js/gate.js が Canvas2D で観測インタラクションを描く器になる。
   position:relative は canvas の inset:0 配置のため、overflow:hidden は帯の外へ
   ジッターした粒がはみ出さないための保険（既存の.chevron-bandマスクと併用） */
#gate{margin-top:10vh;margin-bottom:10vh;position:relative;overflow:hidden}

.chevron-band{
  height:38px;margin:0 var(--pad);
  background-image:url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='48'%20height='61'%20viewBox='0%200%2048%2061'%3E%3Cg%20fill='none'%20stroke-width='5'%20stroke-dasharray='2.6%202'%3E%3Cpath%20stroke='%23C49500'%20d='M0%2017.8%2012%202.6%2024%2017.8%2036%202.6%2048%2017.8'/%3E%3Cpath%20stroke='%23F0C000'%20d='M0%2038.1%2012%2022.9%2024%2038.1%2036%2022.9%2048%2038.1'/%3E%3Cpath%20stroke='%23E3D5A8'%20d='M0%2058.4%2012%2043.2%2024%2058.4%2036%2043.2%2048%2058.4'/%3E%3C/g%3E%3C/svg%3E");
  background-size:19px 24.2px;
  opacity:.4;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
}

/* ---------- section scaffolding ---------- */
main{position:relative;z-index:2}
section{padding:clamp(90px,14vh,180px) var(--pad)}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:1em;
  border-bottom:1px solid var(--hairline-strong);padding-bottom:14px;margin-bottom:clamp(40px,6vw,80px)}
.sec-label{font-size:11px;letter-spacing:.28em;color:var(--ink)}
.sec-label::before{content:"";display:inline-block;width:9px;height:9px;background:var(--gold);
  margin-right:1em;transform:translateY(0px)}
.sec-note{font-size:10px;letter-spacing:.24em;color:var(--ink-3)}

/* ============================================================
   HERO — FIG.01
   ============================================================ */
.hero{
  min-height:100svh;position:relative;display:flex;flex-direction:column;justify-content:flex-start;
  padding:15vh var(--pad) 12vh;
}
.hero-titles{position:relative;z-index:2;pointer-events:none}
.hero-titles a{pointer-events:auto}
/* ヒーローに大タイトルがある間、ヘッダーの小ロゴは重複するので隠す（スクロールで出現） */
body[data-page="index"] .wordmark{opacity:0;transition:opacity .45s}
body[data-page="index"].show-mark .wordmark{opacity:1}
.fig-note{position:absolute;left:var(--pad);bottom:26px;z-index:2;pointer-events:none;max-width:70%}
.fig-label{font-size:10px;letter-spacing:.26em;color:var(--ink-2)}
.hero .state-label{top:76px;right:var(--pad)}
.state-mark{width:8px;height:8px;border-radius:50%;background:var(--gold);display:inline-block;
  box-shadow:0 0 0 3px rgba(240,192,0,.25);transition:border-radius .3s,background .3s}
.state-label[data-state="particle"] .state-mark{border-radius:0;background:var(--gold-deep)}

/* ---------- 焼き込み背景動画レイヤー（Phase 4-A・存在時のみjs/main.jsが生成） ---------- */
.hero-bake{position:fixed;inset:0;width:100%;height:100%;object-fit:cover;z-index:0;pointer-events:none;opacity:0;transition:opacity 1.2s}
/* ---------- 焼きの多重露光・2枚目（Phase 6・存在時のみjs/main.jsが生成） ---------- */
.hero-bake2{mix-blend-mode:screen;transform:scaleX(-1)}

/* ---------- 干渉の大気（固定レイヤー：スクロールでゆっくり減衰し急に消えない） ---------- */
#slit-canvas{position:fixed;inset:0;width:100%;height:100%;touch-action:pan-y;pointer-events:none}
/* 色の洗い：夜空の藍のグラデーション＋足元の金のブルーム（Shopify的な大気の豊かさ） */
:root:not(.theme-dark) .hero-wash{display:none}
/* ライトは背景自体が明るいので白ヴェールは不要（ヒーローだけ明るくなり境界が出る） */
:root:not(.theme-dark) .hero-veil{display:none}
.hero-wash{position:absolute;top:0;left:0;right:0;bottom:-40vh;pointer-events:none;
  -webkit-mask-image:linear-gradient(180deg,#000 52%,transparent 100%);
  mask-image:linear-gradient(180deg,#000 52%,transparent 100%);
  background:
    radial-gradient(120% 90% at 72% 30%, rgba(52,48,90,.34) 0%, rgba(17,17,28,0) 55%),
    radial-gradient(90% 70% at 18% 88%, rgba(240,192,0,.08) 0%, rgba(240,192,0,0) 55%),
    radial-gradient(140% 110% at 50% 115%, rgba(30,26,50,.55) 0%, rgba(17,17,28,0) 60%);
  animation:washDrift 26s ease-in-out infinite alternate}
/* Phase 5-A 輝度予算の是正：hero最前のscrim。文字が乗る左下だけ背景を沈めて可読性を確保（テーマ両対応） */
.hero-veil{position:absolute;inset:0;pointer-events:none;z-index:1;
  background:radial-gradient(92% 82% at 12% 70%,rgba(252,253,255,.80),transparent 62%)}
.theme-dark .hero-veil{background:radial-gradient(92% 82% at 12% 70%,rgba(8,8,14,.66),transparent 62%)}
@keyframes washDrift{
  0%{transform:translate3d(0,0,0) scale(1)}
  100%{transform:translate3d(-2.5%,1.5%,0) scale(1.06)}
}
.state-label{position:absolute;font-size:10px;letter-spacing:.22em;color:var(--ink-2);pointer-events:none;
  display:flex;align-items:center;gap:.8em;z-index:2}
.hero-hint{margin-top:.6em;font-family:var(--serif);font-size:12.5px;color:var(--ink-2);letter-spacing:.12em}
.corner-meta{position:absolute;font-size:9px;letter-spacing:.24em;color:var(--ink-3);pointer-events:none}
.c-br{bottom:30px;right:var(--pad)}
.hero-over{font-size:10px;letter-spacing:.34em;color:var(--gold-deep);margin-bottom:.9em}
.hero-title{
  font-family:var(--serif);font-weight:800;
  font-size:clamp(56px,11vw,150px);
  line-height:1.04;letter-spacing:.01em;
}
.hero-sub{font-family:var(--serif);font-size:clamp(14px,1.6vw,19px);color:var(--ink-2);
  letter-spacing:.3em;margin-top:.8em}
.hero-lead{margin-top:1.6em;font-size:13.5px;color:var(--ink-2);
  display:flex;align-items:baseline;gap:1.6em;flex-wrap:wrap}
.hero-lead .line-link{font-size:14px}
.hero-over,.hero-title,.hero-sub,.hero-lead{will-change:transform}
.scroll-cue{position:absolute;right:var(--pad);bottom:80px;font-size:10px;letter-spacing:.4em;color:var(--ink-3);
  writing-mode:vertical-rl;z-index:2}
.scroll-cue span{display:inline-block;animation:cue 2.6s var(--ease-out) infinite}
@keyframes cue{0%,100%{transform:translateY(0);opacity:1}50%{transform:translateY(10px);opacity:.35}}
@media (max-width:720px){
  .hero{padding:90px var(--pad) 12vh}
  .scroll-cue,.corner-meta{display:none}
  .exp-stage{height:52svh;min-height:340px}
  .hero-hint{font-size:11px}
  /* Phase 5-A モバイル減光：iPhone等で文字が読めるよう粒子を抑えscrimを強める */
  #slit-canvas,#space-canvas{opacity:.60}
  .hero-veil{background:radial-gradient(92% 82% at 12% 70%,rgba(252,253,255,.90),transparent 62%)}
  /* Phase 33-B: scrim中心をデスクトップのテキスト位置(12%,70%)からモバイル実測位置
     （hero-lead実測: top28.1%〜bottom38.2%・横は左右ほぼ均等＝中心約(50%,34%)）へ移動。
     33-A（FOV横幅下限）適用後もdarkの可読性を保証する二重の保険（DESIGN_TUNING.md Phase33参照）。
     lightは:root:not(.theme-dark) .hero-veil{display:none}が上のhero-veilごと無効化しているため、
     上の.hero-veil（light用）は実測上は無関係＝意図的に触っていない（33-A適用後もlightのrange改善には
     scrim追加が逆効果と実測で判断したため。理由はRESULT.md/Phase33実装記録に記載）。 */
  .theme-dark .hero-veil{background:radial-gradient(120% 70% at 50% 34%,rgba(8,8,14,.80),transparent 68%)}
}

/* ============================================================
   STATEMENT — kinetic lines
   ============================================================ */
.statement{max-width:1200px;margin:0 auto}
.statement .sec-label{margin-bottom:2.2em}
.kinetic-line{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(26px,4.6vw,58px);
  line-height:1.55;
  margin:1.1em 0;
  color:var(--ink);
  will-change:letter-spacing,opacity,transform;
}
.kinetic-line:nth-child(3){padding-left:clamp(0px,8vw,140px)}
.kinetic-line:nth-child(4){text-align:right}
.sp{display:none}
@media (max-width:720px){.sp{display:block}.kinetic-line:nth-child(4){text-align:left}}

/* ============================================================
   PYRAMID FIELD — FIG.02（背景の粒子空間がピラミッドに変形する）
   ============================================================ */
.pyramid-sec{min-height:110svh;display:flex;flex-direction:column;justify-content:center}
.pyramid-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:clamp(30px,5vw,90px);align-items:center}
.pyramid-window{position:relative;min-height:56svh}
.field-tag{position:absolute;font-size:9.5px;letter-spacing:.26em;color:var(--ink-2);
  padding:.5em 1em;border:1px solid var(--hairline);background:rgba(var(--paper-rgb),.55);backdrop-filter:blur(3px)}
/* 計器パネル：左端に縦一列（相互の重なりとキャプション衝突を防ぐ） */
.ft-1{top:3%;left:0}
.ft-2{top:15%;left:0;animation-delay:-3.2s}
.ft-3{top:27%;left:0}
.ft-4{top:39%;left:0}
.pyr-caption{position:absolute;left:0;bottom:0;
  font-family:var(--serif);font-size:13px;color:var(--ink-2);letter-spacing:.14em;
  text-align:left;line-height:2.1}
.strata{list-style:none;counter-reset:s;
  background:rgba(var(--paper-rgb),.72);backdrop-filter:blur(5px);
  border:1px solid var(--hairline);padding:.4em 1.6em;
  box-shadow:0 24px 60px -36px rgba(0,0,0,.3)}
.strata li{border-top:1px solid var(--hairline)}
.strata li:last-child{border-bottom:1px solid var(--hairline)}
.strata a{display:flex;align-items:center;gap:1.4em;padding:1.35em .2em;transition:background .3s,padding-left .35s var(--ease-out)}
.strata a:hover{background:var(--paper);padding-left:1em}
.strata-no{font-size:11px;color:var(--gold-text);letter-spacing:.2em}
.strata-body{display:flex;flex-direction:column;gap:.15em}
.strata-jp{font-family:var(--serif);font-size:clamp(20px,2.4vw,28px);font-weight:600}
.strata-en{font-size:10px;letter-spacing:.24em;color:var(--ink-3)}
.strata-arrow{margin-left:auto;color:var(--gold-deep);font-size:18px;transition:transform .35s var(--ease-out)}
.strata a:hover .strata-arrow{transform:translateX(8px)}
@media (max-width:900px){.pyramid-grid{grid-template-columns:1fr}}

/* ============================================================
   SELECTED WORKS — FIG.03
   ============================================================ */
.works-list{list-style:none;display:grid;grid-template-columns:repeat(12,1fr);
  gap:clamp(36px,5vw,72px) clamp(18px,2.5vw,40px)}
.work-item{grid-column:span 12}
.work-item:nth-child(6n+1){grid-column:1/span 7}
.work-item:nth-child(6n+2){grid-column:9/span 4;margin-top:clamp(30px,6vw,110px)}
.work-item:nth-child(6n+3){grid-column:2/span 5;margin-top:clamp(-20px,-2vw,-60px)}
.work-item:nth-child(6n+4){grid-column:8/span 5}
.work-item:nth-child(6n+5){grid-column:1/span 4;margin-top:clamp(20px,4vw,70px)}
.work-item:nth-child(6n+6){grid-column:6/span 7}
.work-link{display:block;border-top:1px solid var(--hairline-strong);padding-top:14px;position:relative;
  transform-style:preserve-3d;transition:transform .5s var(--ease-out);will-change:transform}
.work-head{display:flex;align-items:baseline;gap:1.2em;font-size:10px;letter-spacing:.22em;color:var(--ink-3);margin-bottom:1em}
.work-no{color:var(--gold-text)}
.work-access{margin-left:auto}
/* 標本プレート：シェブロン地紋＋図版番号（実サムネ到着後は img に置換） */
.work-specimen{height:clamp(110px,13vw,180px);margin-bottom:1.1em;position:relative;overflow:hidden;
  background:rgba(var(--white-rgb),.6);border:1px solid var(--hairline);
  box-shadow:0 30px 60px -42px rgba(28,27,24,.4);
  display:flex;align-items:flex-end;justify-content:space-between;
  padding:14px 18px;transform:translateZ(28px)}
.work-specimen::before{content:"";position:absolute;inset:0;opacity:.13;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='48'%20height='61'%20viewBox='0%200%2048%2061'%3E%3Cg%20fill='none'%20stroke-width='5'%20stroke-dasharray='2.6%202'%3E%3Cpath%20stroke='%23C49500'%20d='M0%2017.8%2012%202.6%2024%2017.8%2036%202.6%2048%2017.8'/%3E%3Cpath%20stroke='%23F0C000'%20d='M0%2038.1%2012%2022.9%2024%2038.1%2036%2022.9%2048%2038.1'/%3E%3Cpath%20stroke='%23E3D5A8'%20d='M0%2058.4%2012%2043.2%2024%2058.4%2036%2043.2%2048%2058.4'/%3E%3C/g%3E%3C/svg%3E");
  background-size:26px 33px}
.work-specimen img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.spec-no{font-family:var(--serif);font-weight:800;font-size:clamp(40px,5vw,68px);line-height:.9;
  color:var(--gold-text);opacity:.85;position:relative}
.spec-type{font-size:9px;letter-spacing:.3em;color:var(--ink-3);position:relative}
.work-title{font-family:var(--serif);font-size:clamp(22px,2.6vw,34px);font-weight:600;line-height:1.4;
  transition:color .3s}
.work-link:hover .work-title{color:var(--gold-deep)}
.work-desc{font-size:13px;color:var(--ink-2);margin-top:.6em;max-width:36em}
.work-more{text-align:center;margin-top:clamp(50px,7vw,90px)}
@media (max-width:820px){
  .work-item,.work-item:nth-child(n){grid-column:1/-1 !important;margin-top:0 !important}
}

/* line-link (shared arrow link) */
.line-link{display:inline-flex;align-items:baseline;gap:.9em;font-family:var(--serif);
  font-size:15px;letter-spacing:.12em;border-bottom:1px solid var(--ink);padding-bottom:6px;
  transition:color .3s,border-color .3s}
.line-link .grot{font-size:13px;transition:transform .35s var(--ease-out);display:inline-block}
.line-link:hover{color:var(--gold-deep);border-color:var(--gold-deep)}
.line-link:hover .grot{transform:translateX(6px)}

/* ============================================================
   PRICE — TABLE I
   ============================================================ */
.price-sec{background:rgba(var(--paper2-rgb),.6);backdrop-filter:blur(4px)}
.price-rows{list-style:none;max-width:1100px;margin:0 auto}
.price-rows li{
  display:grid;grid-template-columns:1.1fr 1.4fr auto;gap:1.5em;align-items:baseline;
  border-top:1px solid var(--hairline-strong);padding:2em .2em;
}
.price-rows li:last-child{border-bottom:1px solid var(--hairline-strong)}
.price-name{display:flex;flex-direction:column;gap:.3em;font-family:var(--serif);
  font-size:clamp(18px,2vw,24px);font-weight:600}
.price-name .grot{font-size:10px;letter-spacing:.3em;color:var(--gold-text)}
.price-desc{font-size:13px;color:var(--ink-2)}
.price-val{text-align:right;display:flex;flex-direction:column;gap:.2em}
.price-val em{font-style:normal;font-family:var(--serif);font-size:clamp(22px,2.6vw,32px);font-weight:600}
.price-val .grot{font-size:10px;letter-spacing:.2em;color:var(--ink-3)}
.price-cta{max-width:1100px;margin:3.5em auto 0}
@media (max-width:820px){
  .price-rows li{grid-template-columns:1fr;gap:.6em}
  .price-val{text-align:left;flex-direction:row;align-items:baseline;gap:1em}
}

/* ============================================================
   OBSERVER / APPENDIX
   ============================================================ */
.observer-sec .sec-label{margin-bottom:3em}
.observer-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:clamp(30px,6vw,110px);max-width:1200px}
.observer-lead{font-family:var(--serif);font-size:clamp(20px,2.6vw,32px);font-weight:500;line-height:2}
.observer-side{border-left:1px solid var(--hairline-strong);padding-left:clamp(18px,2.5vw,36px);
  display:flex;flex-direction:column;gap:1.2em;justify-content:center}
.observer-name{font-family:var(--serif);font-size:20px;font-weight:600}
.observer-name .grot{display:block;font-size:10px;letter-spacing:.3em;color:var(--ink-3);margin-top:.5em}
.observer-note{font-size:13px;color:var(--ink-2)}
@media (max-width:820px){.observer-grid{grid-template-columns:1fr}
  .observer-side{border-left:0;border-top:1px solid var(--hairline-strong);padding:1.6em 0 0}}

/* ============================================================
   FOOTER
   ============================================================ */
.site-foot{border-top:1px solid var(--hairline-strong);padding:clamp(50px,7vw,90px) var(--pad) 30px;
  background:var(--paper)}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:2em;margin-bottom:clamp(46px,6vw,80px)}
.foot-mark{font-family:var(--serif);font-weight:800;font-size:clamp(34px,5vw,64px);line-height:1.1}
.foot-col{display:flex;flex-direction:column;gap:.7em;font-size:11px;letter-spacing:.22em}
.foot-col p{color:var(--gold-text);margin-bottom:.4em}
.foot-col a{color:var(--ink-2);transition:color .3s}
.foot-col a:hover{color:var(--gold-deep)}
.foot-meta{font-size:10px;letter-spacing:.2em;color:var(--ink-3);line-height:2;text-align:right}
.foot-line{border-top:1px solid var(--hairline);padding-top:22px;font-size:10px;letter-spacing:.22em;
  color:var(--ink-3);display:flex;justify-content:space-between;gap:2em;flex-wrap:wrap}
@media (max-width:820px){.foot-grid{grid-template-columns:1fr 1fr}.foot-meta{text-align:left;grid-column:1/-1}}

/* ============================================================
   SUB PAGES（トップ＝実験、中＝論文）
   ============================================================ */
.sub-main{padding-top:130px;min-height:78svh}
.sub-head{padding:0 var(--pad) clamp(40px,6vw,70px);border-bottom:1px solid var(--hairline-strong)}
.sub-label{font-size:11px;letter-spacing:.28em;color:var(--gold-deep);margin-bottom:1.6em}
.sub-title{font-family:var(--serif);font-weight:800;font-size:clamp(40px,7vw,84px);line-height:1.15}
.sub-title-en{font-size:11px;letter-spacing:.34em;color:var(--ink-3);margin-top:1.4em}
.sub-body{padding:clamp(40px,6vw,80px) var(--pad)}

/* sub works list（論文形式の一覧） */
.paper-list{list-style:none;max-width:1150px}
.paper-list li{border-top:1px solid var(--hairline)}
.paper-list li:last-child{border-bottom:1px solid var(--hairline)}
.paper-row{display:grid;grid-template-columns:auto 1fr auto;gap:1.6em;align-items:baseline;
  padding:1.8em .2em;transition:background .3s,padding-left .35s var(--ease-out)}
a.paper-row:hover{background:var(--white);padding-left:1em}
.paper-no{font-size:10px;letter-spacing:.2em;color:var(--gold-text)}
.paper-main{display:flex;flex-direction:column;gap:.35em}
.paper-title{font-family:var(--serif);font-size:clamp(19px,2.4vw,27px);font-weight:600}
.paper-desc{font-size:12.5px;color:var(--ink-2);max-width:44em}
.paper-tag{font-size:9.5px;letter-spacing:.22em;color:var(--ink-3);white-space:nowrap}
.paper-empty{padding:3em .2em;font-family:var(--serif);color:var(--ink-2);letter-spacing:.1em}

/* price page detail */
.price-note{max-width:820px;margin-top:3em;font-size:13px;color:var(--ink-2);line-height:2.2}
.price-note strong{font-weight:700;color:var(--ink)}

/* profile page */
.profile-block{max-width:820px;margin-bottom:clamp(40px,6vw,70px)}
.profile-block h2{font-family:var(--serif);font-size:20px;font-weight:600;margin-bottom:1em;
  padding-bottom:.6em;border-bottom:1px solid var(--hairline)}
.profile-block p{font-size:14px;color:var(--ink-2)}
.contact-links{display:flex;gap:2.5em;flex-wrap:wrap;margin-top:1.6em}

/* ---------- テーマトグル ---------- */
.theme-btn{font-size:11px;letter-spacing:.26em;background:none;border:0;color:var(--ink);
  font-family:var(--grot);display:flex;align-items:center;gap:.7em;padding:.2em 0;margin-right:2em;white-space:nowrap}
.theme-btn::before{content:"";width:8px;height:8px;border-radius:50%;display:inline-block;
  background:linear-gradient(90deg,var(--ink) 50%,transparent 50%);border:1px solid var(--ink)}
body{transition:background-color .5s ease}

/* 粒子の上に置かれる裸のテキストは、背景色のハローで可読性を守る */
.kinetic-line,.sec-label,.sec-note,.pyr-caption,.observer-lead,
.hero-over,.hero-sub,.hero-lead,.fig-note,.strata-jp{
  text-shadow:0 0 22px var(--paper),0 0 48px var(--paper),0 1px 3px var(--paper);
}

/* ---------- 音のレイヤー ---------- */
.sound-btn{font-size:11px;letter-spacing:.26em;background:none;border:0;color:var(--ink);
  font-family:var(--grot);display:flex;align-items:center;gap:.7em;padding:.2em 0;margin-right:2em;white-space:nowrap}
.sound-btn::before{content:"";width:8px;height:8px;border-radius:50%;
  border:1px solid var(--gold-deep);display:inline-block;transition:background .3s}
.sound-btn.is-on::before{background:var(--gold);box-shadow:0 0 0 3px rgba(240,192,0,.22)}
.sound-credit{position:fixed;left:var(--pad);bottom:18px;z-index:90;
  font-family:var(--grot);font-size:9.5px;letter-spacing:.24em;color:var(--ink-3);
  opacity:0;transform:translateY(8px);transition:opacity .5s,transform .5s;pointer-events:none}
.sound-credit.is-show{opacity:1;transform:none}
@media (max-width:720px){.sound-credit{display:none}}

/* ---------- 実サムネのduotone統一（インク×金の標本図版化） ---------- */
.work-specimen.has-thumb img{filter:grayscale(1) contrast(1.07) brightness(1.02)}
.work-specimen.has-thumb::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:var(--gold-text);mix-blend-mode:color;opacity:.9}

/* ============================================================
   reduced motion
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s !important;transition-duration:.001s !important}
  [data-reveal]{opacity:1;transform:none;filter:none}
  [data-float]{animation:none}
  html{scroll-behavior:auto}
}
@media (max-width:900px){
  .pyramid-sec{min-height:auto}
  .pyramid-window{min-height:52svh}
}

/* ---------- ヘッダー圧縮（中間幅〜モバイル。折り返し・STATEとの衝突を防ぐ） ---------- */
@media (max-width:1000px){
  .site-head{gap:.9em;align-items:center;padding:14px var(--pad);flex-wrap:nowrap}
  .sound-btn,.theme-btn{margin-right:0;font-size:9.5px;letter-spacing:.12em;gap:.45em}
  .sound-btn .btn-label,.theme-btn .btn-label{display:none}
  .menu-btn{font-size:9.5px;letter-spacing:.16em;gap:.5em}
  .menu-tick{width:20px}
  .hero .state-label{display:none}   /* モバイルでは冗長・タイトルと干渉するため非表示 */
  .hero-title{font-size:clamp(44px,13vw,90px)}
}