/* =========================================================================
   乃木坂46美術館 — PERMANENT COLLECTION
   A museum, on the web. White silence. The grammar of exhibition.
   Prefix: nm- (nogi museum). Vanilla. Google Fonts only.
   ========================================================================= */

/* ---------- Design tokens ---------- */
:root {
  --gallery: #F4F1EA;   /* exhibition wall — warm white */
  --paper:   #FBF9F4;   /* placard paper */
  --ink:     #211D26;   /* text / frame black */
  --murasaki:#6B4FA0;   /* nogizaka purple, refined */
  --m-deep:  #46346E;
  --brass:   #A8946B;   /* brass — frame & plate fittings */
  --line:    rgba(33,29,38,.14);
  --line-2:  rgba(33,29,38,.08);
  --shadow:  rgba(33,29,38,.10);
  --shadow-d:rgba(33,29,38,.22);

  --w: min(1180px, 90vw);
  --pad: clamp(96px, 16vh, 200px);

  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-soft: cubic-bezier(.4, 0, .2, 1);

  --ff-jp:   "Zen Old Mincho", "Hiragino Mincho ProN", serif;
  --ff-disp: "Playfair Display", Georgia, serif;
  --ff-ui:   "Inter", system-ui, sans-serif;

  /* ----- per-room scenography (cross-faded on body[data-room]) -----
     Every room's chrome — lintel / placard / frame / baseboard / text —
     reads these, never the raw constants. Default = the warm-white gallery. */
  --wall:       var(--gallery);  /* the wall behind everything             */
  --room-fg:    var(--ink);      /* body text inside this room             */
  --room-dim:   rgba(33,29,38,.62); /* secondary text / EN captions       */
  --room-line:  var(--line);     /* hairlines, baseboards, frame insets    */
  --room-paper: var(--paper);    /* placard / card paper                   */
  --room-brass: var(--brass);    /* fittings — warms or cools per room     */
  --room-shadow:var(--shadow-d); /* drop-shadow tint                       */
  --room-spot:  rgba(255,251,238,.85); /* spotlight cone tint              */
  --grain-blend: multiply;       /* paper grain blend (screen in darkrooms)*/
  --grain-op:   .03;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { overflow-x: clip; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  background-color: var(--wall);
  color: var(--room-fg);
  font-family: var(--ff-ui);
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  /* the scenography transposes between rooms — the wall changes key */
  transition: background-color .9s var(--ease-soft), color .9s var(--ease-soft);
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ol, ul { list-style: none; }
em { font-style: italic; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--murasaki); outline-offset: 3px; border-radius: 2px; }
::selection { background: rgba(107,79,160,.22); }

/* ---------- Paper-grain wall texture (fixed, ~.03) ---------- */
.nm-grain { position: absolute; width: 0; height: 0; }
body::before {
  content: "";
  position: fixed; inset: 0;
  filter: url(#nm-paper);
  opacity: var(--grain-op);
  pointer-events: none;
  z-index: 4;                 /* paper grain sits ABOVE the light layer (z3) */
  mix-blend-mode: var(--grain-blend);
  transition: opacity .9s var(--ease-soft);
}

/* ============ 光のレイヤー — light.js canvas ============
   Above the exhibition content (main z2), under the paper grain (z4).
   light.js paints drifting dust + the天窓/ランプ light shafts. */
.nm-light {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  z-index: 3;                 /* over main(z2), under grain(z4); pointer-through */
  pointer-events: none;
  display: block;
}

/* small-caps UI label helper */
.nm-cap { font-family: var(--ff-ui); font-weight: 600; letter-spacing: .22em; text-transform: uppercase; }

main { position: relative; z-index: 2; }

/* =========================================================================
   部屋ごとの壁色の転調 — per-room scenography
   body[data-room] is set by app.js (currentRoom). The body cross-fades its
   background/color over .9s; every room's chrome follows the --room-* vars,
   so a single switch repaints lintels, placards, frames and baselines.
   White → white → 暗室(茄子紺) → 藤鼠の壁 → 中明 → white → 暖色 → 闇.
   ========================================================================= */
body[data-room="hall"]      { --wall:#F4F1EA; --room-fg:#211D26; --room-dim:rgba(33,29,38,.62); --room-line:rgba(33,29,38,.14); --room-paper:#FBF9F4; }
body[data-room="white"]     { --wall:#FCFBF8; --room-fg:#211D26; --room-dim:rgba(33,29,38,.60); --room-line:rgba(33,29,38,.13); --room-paper:#FFFFFF; }

/* 常設展 — the darkroom. 茄子紺 #1E1726. The collection is the dramatic core. */
body[data-room="collection"] {
  --wall:#1E1726; --room-fg:#F2EEE6; --room-dim:rgba(242,238,230,.58);
  --room-line:rgba(242,238,230,.16); --room-paper:#2A2233; --room-brass:#C7AE7B;
  --room-shadow:rgba(0,0,0,.6); --room-spot:rgba(255,247,224,.95);
  --grain-blend:screen; --grain-op:.05;
}

/* 肖像の間 — 藤鼠の壁 #564A6E. Gilt frames sing against the dusk-violet wall. */
body[data-room="salon"] {
  --wall:#564A6E; --room-fg:#F4F0E8; --room-dim:rgba(244,240,232,.62);
  --room-line:rgba(244,240,232,.20); --room-paper:#473C5E; --room-brass:#D2BB8C;
  --room-shadow:rgba(20,14,30,.5); --room-spot:rgba(255,250,235,.9);
  --grain-blend:soft-light; --grain-op:.05;
}

body[data-room="archive"]   { --wall:#E6E3D8; --room-fg:#2A2620; --room-dim:rgba(42,38,32,.6);  --room-line:rgba(42,38,32,.16); --room-paper:#F2EFE5; }
body[data-room="special"]   { --wall:#F4F1EA; --room-fg:#211D26; --room-dim:rgba(33,29,38,.62); --room-line:rgba(33,29,38,.14); --room-paper:#FBF9F4; }
body[data-room="shop"]      { --wall:#EFE7D8; --room-fg:#2A2418; --room-dim:rgba(42,36,24,.6);  --room-line:rgba(42,36,24,.16); --room-paper:#FAF4E8; --room-brass:#9E875A; }

/* 芳名帳 — the museum after closing. One lamp in the dark. */
body[data-room="guestbook"] {
  --wall:#231C2E; --room-fg:#EDE8F2; --room-dim:rgba(237,232,242,.5);
  --room-line:rgba(237,232,242,.14); --room-paper:#2E2640; --room-brass:#B7A079;
  --room-shadow:rgba(0,0,0,.6); --grain-blend:screen; --grain-op:.04;
}

/* =========================================================================
   入館券 — ADMIT ONE
   ========================================================================= */
.nm-ticket {
  position: fixed; inset: 0; z-index: 200;
  display: grid; place-items: center;
  background: var(--gallery);
  cursor: pointer;
}
.nm-ticket.is-gone { opacity: 0; pointer-events: none; transition: opacity .5s var(--ease-soft); }
.nm-ticket__stage { display: grid; place-items: center; gap: 22px; width: min(720px, 92vw); }

.nm-ticket__card {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 22px 132px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 26px 60px -28px var(--shadow-d), 0 2px 0 var(--line-2);
  transition: opacity .5s var(--ease-soft), transform .5s var(--ease-soft);
}
.nm-ticket__card.is-fade { opacity: 0; transform: scale(.985); }

.nm-ticket__main {
  position: relative;
  padding: clamp(28px, 5vw, 48px) clamp(26px, 4vw, 44px);
  display: grid; gap: 26px;
}
.nm-ticket__brand-ja { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.2rem, 3.4vw, 1.7rem); letter-spacing: .14em; }
.nm-ticket__brand-en { font-family: var(--ff-disp); font-style: italic; color: var(--brass); letter-spacing: .26em; font-size: .72rem; margin-top: 4px; }

.nm-ticket__admit { border-top: 1px solid var(--line); padding-top: 22px; }
.nm-ticket__admit-ja { font-family: var(--ff-jp); font-weight: 900; font-size: clamp(2rem, 8vw, 3.4rem); letter-spacing: .2em; }
.nm-ticket__admit-en { font-family: var(--ff-disp); letter-spacing: .42em; font-size: .82rem; color: var(--ink); opacity: .7; margin-top: 6px; }

/* perforation (ミシン目) */
.nm-ticket__perf {
  background-image: radial-gradient(circle, var(--line) 1.4px, transparent 1.6px);
  background-size: 4px 12px;
  background-position: center;
  background-repeat: repeat-y;
}
.nm-ticket__stub {
  display: grid; align-content: center; justify-items: center; gap: 4px;
  padding: 18px 10px;
  background:
    repeating-linear-gradient(45deg, transparent 0 8px, rgba(107,79,160,.04) 8px 9px);
  border-left: 1px dashed var(--line);
  transform-origin: left center;
  will-change: transform, opacity;
}
.nm-ticket__stub.is-torn { animation: nm-tear .9s var(--ease) forwards; }
.nm-ticket__stub-label { font-family: var(--ff-disp); font-style: italic; color: var(--brass); font-size: .8rem; }
.nm-ticket__stub-no { font-family: var(--ff-disp); font-weight: 700; font-size: 1.5rem; letter-spacing: .04em; }
.nm-ticket__stub-date { font-family: var(--ff-ui); font-size: .62rem; letter-spacing: .12em; color: var(--ink); opacity: .55; }

@keyframes nm-tear {
  0%   { transform: translate(0,0) rotate(0); opacity: 1; }
  100% { transform: translate(64px, 150px) rotate(34deg); opacity: 0; }
}

/* stamp (date seal) */
.nm-ticket__stamp {
  position: absolute;
  right: clamp(18px, 5vw, 52px); top: 50%;
  width: 132px; height: 132px;
  margin-top: -66px;
  border-radius: 50%;
  border: 2.5px solid var(--murasaki);
  color: var(--murasaki);
  display: grid; place-items: center;
  opacity: 0;
  transform: scale(1.6) rotate(-12deg);
  pointer-events: none;
}
.nm-ticket__stamp::before {
  content: ""; position: absolute; inset: 7px; border-radius: 50%;
  border: 1px solid var(--murasaki);
}
.nm-ticket__stamp.is-inked {
  opacity: .9;
  transform: scale(1) rotate(-12deg);
  box-shadow: 0 0 0 1px rgba(107,79,160,.25), 0 0 14px 2px rgba(107,79,160,.18) inset;
  transition: opacity .42s var(--ease), transform .42s var(--ease), box-shadow .42s var(--ease) .08s;
}
.nm-ticket__stamp-ring {
  position: absolute; inset: 0;
  font-family: var(--ff-ui); font-size: .42rem; letter-spacing: .04em;
  /* circular text via SVG-less trick: just small caps ring imitation -> we keep a faint ring caption */
  display: grid; place-items: center;
  color: rgba(107,79,160,.55);
  padding: 12px;
  text-align: center;
  line-height: 1.2;
}
.nm-ticket__stamp-date {
  position: relative; z-index: 1;
  font-family: var(--ff-disp); font-weight: 700; font-size: 1.04rem; letter-spacing: .02em;
}
.nm-ticket__hint {
  font-family: var(--ff-ui); letter-spacing: .2em; font-size: .68rem; text-transform: uppercase;
  color: var(--ink); opacity: .42;
}

/* =========================================================================
   Floor-map button / 音声ガイド chip
   ========================================================================= */
.nm-mapbtn {
  position: fixed; top: clamp(16px, 3vw, 28px); right: clamp(16px, 3vw, 28px); z-index: 90;
  display: inline-flex; align-items: baseline; gap: 8px;
  padding: 10px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 8px 22px -14px var(--shadow-d);
  transition: box-shadow .3s var(--ease), transform .3s var(--ease), opacity .5s var(--ease);
  opacity: 0; pointer-events: none;            /* handed to you after the entrance hall */
}
.nm-mapbtn.is-visible { opacity: 1; pointer-events: auto; }
.nm-mapbtn:hover { box-shadow: 0 12px 28px -14px var(--shadow-d); transform: translateY(-1px); }
.nm-mapbtn__ja { font-family: var(--ff-jp); font-weight: 500; font-size: .82rem; letter-spacing: .1em; }
.nm-mapbtn__en { font-family: var(--ff-disp); font-style: italic; color: var(--brass); font-size: .72rem; letter-spacing: .2em; }

.nm-guide {
  position: fixed; left: clamp(14px, 3vw, 26px); bottom: clamp(14px, 3vw, 26px); z-index: 90;
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 14px 8px 10px;
  background: rgba(251,249,244,.86);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  box-shadow: 0 8px 22px -16px var(--shadow-d);
  transition: opacity .4s var(--ease);
}
.nm-guide__no {
  width: 24px; height: 24px; flex: none;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--murasaki); color: #fff;
  font-size: .8rem;
}
.nm-guide__name { font-family: var(--ff-jp); font-weight: 500; font-size: .82rem; letter-spacing: .06em; }

/* =========================================================================
   Shared museum grammar: lintel / placard / frame / reveal / baseboard
   ========================================================================= */
.nm-room { position: relative; padding: var(--pad) 0; }
/* baseboard (巾木) — bottom line on every room transition */
.nm-room::after,
.nm-hall::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--room-line) 12%, var(--room-line) 88%, transparent);
  transition: background .9s var(--ease-soft);
}

/* 鴨居 lintel — room number plate, carved into the wall (浮き彫り) */
.nm-lintel {
  width: var(--w); margin: 0 auto clamp(48px, 8vh, 96px);
  display: grid; gap: 6px; justify-items: center; text-align: center;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--room-line);
  color: var(--room-fg);
}
.nm-lintel__no { font-family: var(--ff-disp); font-style: italic; font-size: .8rem; letter-spacing: .32em; color: var(--room-brass); }
/* carved-into-the-wall emboss: a 1px light edge above, a shadow below,
   tuned by the wall's own value so it works on white AND dark walls.
   On reveal, a single sheen sweeps left→right across the room name. */
.nm-lintel__ja {
  position: relative; overflow: hidden;
  font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.4rem, 4vw, 2.2rem); letter-spacing: .12em;
  text-shadow: 0 1px 0 rgba(255,255,255,.42), 0 -1px 1px rgba(0,0,0,.3);
}
.nm-lintel__ja::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,.55) 50%, transparent 60%);
  transform: translateX(-130%);
  pointer-events: none; mix-blend-mode: soft-light;
}
[data-reveal].is-in .nm-lintel__ja::after {
  animation: nm-sheen 1.1s var(--ease) .25s 1 both;
}
@keyframes nm-sheen {
  0%   { transform: translateX(-130%); }
  100% { transform: translateX(130%); }
}
.nm-lintel__en { font-family: var(--ff-disp); letter-spacing: .26em; font-size: .76rem; color: var(--room-dim); }

/* placard (プラカード) — unified across all exhibits, follows the room key */
.nm-placard {
  background: var(--room-paper);
  border: 1px solid var(--room-line);
  border-left: 3px solid var(--room-brass);
  padding: 18px 22px;
  box-shadow: 0 10px 26px -20px var(--room-shadow);
  max-width: 100%;
  color: var(--room-fg);
  transition: background .9s var(--ease-soft), border-color .9s var(--ease-soft), color .9s var(--ease-soft);
}
.nm-placard__ja { font-family: var(--ff-jp); font-weight: 500; font-size: .94rem; line-height: 1.85; max-width: 46ch; }
.nm-placard__en { font-family: var(--ff-disp); font-style: italic; font-size: .82rem; color: var(--room-dim); margin-top: 8px; max-width: 56ch; }
.nm-placard__title { font-family: var(--ff-jp); font-weight: 700; font-size: 1.04rem; letter-spacing: .04em; }
.nm-placard__meta { font-family: var(--ff-disp); font-style: italic; color: var(--room-brass); font-size: .82rem; letter-spacing: .04em; margin-top: 2px; }
.nm-placard__sub { font-family: var(--ff-ui); font-size: .76rem; letter-spacing: .04em; color: var(--room-dim); margin-top: 6px; }

/* frame (額縁) — inset border + brass line; "ガラス入り額装" sweep on hover */
.nm-frame {
  position: relative;
  background: var(--room-paper);
  padding: 12px;
  border: 1px solid var(--ink);
  box-shadow: 0 22px 50px -30px var(--room-shadow), 0 0 0 1px var(--room-line) inset;
}
.nm-frame::before {
  content: ""; position: absolute; inset: 5px;
  border: 1px solid var(--room-brass);
  pointer-events: none; z-index: 2;
}
/* glass reflection: a diagonal highlight band that sweeps on hover */
.nm-frame::after {
  content: ""; position: absolute; inset: 0; z-index: 3;
  background: linear-gradient(115deg, transparent 35%, rgba(255,255,255,.12) 48%, rgba(255,255,255,.04) 56%, transparent 66%);
  background-size: 250% 100%; background-position: 120% 0;
  pointer-events: none; opacity: 0;
  transition: background-position .8s var(--ease), opacity .4s var(--ease);
}
.nm-frame--thin { padding: clamp(36px, 7vw, 86px) clamp(30px, 6vw, 80px); }
.nm-frame--gilt { padding: 14px; border-width: 2px; box-shadow: 0 30px 70px -34px var(--room-shadow); }
.nm-frame__mat { background: var(--room-paper); }
.nm-frame img { width: 100%; height: 100%; object-fit: cover; }

/* run the glass sweep whenever a framed work is hovered/focused */
.nm-piece:hover .nm-frame::after,
.nm-portrait:hover .nm-frame::after,
.nm-feature__btn:hover .nm-frame::after,
.nm-artwork:hover .nm-frame::after,
.nm-piece:focus-visible .nm-frame::after,
.nm-portrait:focus-visible .nm-frame::after,
.nm-feature__btn:focus-visible .nm-frame::after {
  opacity: 1; background-position: -120% 0;
}

/* brass plate (真鍮プレート) attached to frames */
.nm-brassplate {
  display: inline-block;
  font-family: var(--ff-disp); font-style: italic; letter-spacing: .06em;
  font-size: .72rem; color: #3a2f1c;
  background: linear-gradient(180deg, #c9b88b, var(--brass));
  border: 1px solid #8d7a52;
  padding: 4px 12px;
  box-shadow: 0 2px 6px -3px var(--shadow-d), 0 1px 0 rgba(255,255,255,.4) inset;
}

/* reveal */
[data-reveal] { opacity: 0; transform: translateY(8px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].is-in { opacity: 1; transform: none; }

/* =========================================================================
   玄関ホール — ENTRANCE HALL
   ========================================================================= */
.nm-hall {
  position: relative;
  min-height: 100svh;
  display: grid; align-content: center;
  padding: clamp(120px, 16vh, 200px) 0;
  overflow: hidden;
  background:
    radial-gradient(120% 70% at 50% -6%, rgba(255,255,255,.55), transparent 58%),
    var(--wall);
}
/* 天窓: a faint cool shaft falling from the top centre (light.js paints the
   moving motes; this is the static spill it stands on). */
.nm-hall::before {
  content: ""; position: absolute; top: -4%; left: 50%; width: min(58vw, 720px); height: 92%;
  transform: translateX(-50%);
  background:
    linear-gradient(180deg, rgba(140,120,180,.16), rgba(140,120,180,0) 62%),
    radial-gradient(60% 44% at 50% 0%, rgba(255,255,255,.5), transparent 70%);
  -webkit-clip-path: polygon(40% 0, 60% 0, 80% 100%, 20% 100%);
          clip-path: polygon(40% 0, 60% 0, 80% 100%, 20% 100%);
  pointer-events: none; z-index: 0; mix-blend-mode: screen;
}
/* 巨大な「乃」: wall-coloured relief carried in the top-right negative space */
.nm-hall__emboss {
  position: absolute; top: clamp(-2vh, 0px, 2vh); right: clamp(-3vw, 1vw, 3vw); z-index: 0;
  font-family: var(--ff-jp); font-weight: 900;
  font-size: clamp(280px, 38vw, 560px); line-height: .82;
  color: var(--wall);
  text-shadow: 1px 1px 0 rgba(255,255,255,.65), -1px -1px 1px rgba(33,29,38,.16);
  opacity: .55; pointer-events: none; user-select: none;
}
.nm-hall__inner {
  position: relative; z-index: 1;
  width: var(--w); margin: 0 auto;
  display: grid; justify-items: start; text-align: left;
  gap: clamp(26px, 4.5vh, 52px);
  /* the nameplate hangs at eye level, below the entrance banners —
     lower-left mass balancing the embossed 乃 in the upper right */
  padding-top: clamp(330px, 40vh, 460px);
}
.nm-plate { display: grid; gap: 14px; justify-items: start; }
.nm-plate__ja { font-family: var(--ff-jp); font-weight: 900; font-size: clamp(2.8rem, 8vw, 7rem); letter-spacing: .1em; line-height: 1.05; }
.nm-plate__en { font-family: var(--ff-disp); letter-spacing: .3em; font-size: clamp(.62rem, 1.6vw, .86rem); color: var(--room-brass); }

/* 序文プラカード offset to the lower-right */
.nm-placard--intro {
  border-left: 0; border-top: 3px solid var(--room-brass); text-align: left; max-width: 600px;
  justify-self: end; margin-right: clamp(0px, 4vw, 60px);
}
.nm-placard--intro .nm-placard__ja { max-width: none; }
.nm-placard--intro .nm-placard__en { max-width: none; }

.nm-stats {
  display: grid; grid-template-columns: repeat(4, auto); gap: clamp(20px, 5vw, 64px);
  padding-top: 12px;
}
.nm-stats__cell { display: grid; justify-items: center; gap: 4px; }
.nm-nowrap { display: inline-block; white-space: nowrap; } /* 館名は「乃木坂46」「美術館」の単位でのみ折り返す */
.nm-stats__n { font-family: var(--ff-disp); font-weight: 700; font-size: clamp(1.6rem, 4vw, 2.6rem); font-variant-numeric: tabular-nums; color: var(--m-deep); }
.nm-stats__l { font-family: var(--ff-ui); font-weight: 600; font-size: .58rem; letter-spacing: .18em; text-transform: uppercase; opacity: .6; }

/* 垂れ幕 hanging banners */
.nm-banner {
  position: absolute; top: 0; z-index: 3;
  width: clamp(120px, 14vw, 180px);
  padding: 20px 14px 26px;
  background: linear-gradient(180deg, var(--murasaki), var(--m-deep));
  color: #fff;
  display: grid; gap: 14px; justify-items: center; text-align: center;
  transform-origin: top center;
  box-shadow: 0 18px 40px -24px var(--shadow-d);
  animation: nm-sway 7s ease-in-out infinite;
}
.nm-banner::after {
  content: ""; position: absolute; bottom: -14px; left: 0; right: 0; height: 16px;
  background:
    linear-gradient(135deg, transparent 50%, var(--m-deep) 50%) 0 0 / 16px 16px repeat-x,
    linear-gradient(225deg, transparent 50%, var(--m-deep) 50%) 8px 0 / 16px 16px repeat-x;
  filter: drop-shadow(0 6px 6px var(--shadow));
}
.nm-banner--left  { left: clamp(8px, 3vw, 48px); animation-delay: -2.2s; }
.nm-banner--right { right: clamp(8px, 3vw, 48px); animation-delay: -4.6s; }
.nm-banner__tag { font-family: var(--ff-disp); font-style: italic; letter-spacing: .2em; font-size: .66rem; opacity: .85; border-bottom: 1px solid rgba(255,255,255,.4); padding-bottom: 8px; }
.nm-banner__txt {
  font-family: var(--ff-jp); font-weight: 500; font-size: clamp(.8rem, 1.5vw, 1rem); letter-spacing: .06em; line-height: 1.8;
  writing-mode: vertical-rl; text-orientation: upright; height: clamp(180px, 26vh, 320px);
}
@keyframes nm-sway { 0%,100% { transform: rotate(-.6deg); } 50% { transform: rotate(.6deg); } }

/* =========================================================================
   ROOM I — 白の間 : work pulled to the left third, prism light in the void
   ========================================================================= */
.nm-white { position: relative; overflow: hidden; }
.nm-white__center {
  width: var(--w); margin: 0 auto;
  display: grid; grid-template-columns: minmax(0, 5fr) 7fr; align-items: center;
}
.nm-artwork--words {
  display: grid; gap: 26px; justify-items: start; max-width: 540px; text-align: left;
  grid-column: 1;
}
.nm-words__ja { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.5rem, 2.6vw, 2.4rem); line-height: 1.7; letter-spacing: .08em; white-space: nowrap; }
.nm-words__en { font-family: var(--ff-disp); font-style: italic; font-size: clamp(.9rem, 2vw, 1.1rem); color: var(--room-brass); margin-top: 18px; }
.nm-artwork--words .nm-placard {
  text-align: left; max-width: 480px;
  justify-self: end; align-self: end; margin-top: 8px;
}

/* プリズム — a thin refracted-rainbow band drifts across the empty wall.
   CSS only (per spec): blurred saturated gradient, multiply, ~90s cycle. */
.nm-white__prism {
  position: absolute; top: -10%; bottom: -10%; left: 30%; width: 26%;
  pointer-events: none; z-index: 0;
  background: linear-gradient(100deg,
    rgba(255,90,90,.0)   0%,
    rgba(255,120,90,.5) 18%,
    rgba(255,225,90,.5) 34%,
    rgba(110,225,140,.5) 50%,
    rgba(90,170,255,.5) 66%,
    rgba(150,110,235,.5) 82%,
    rgba(150,110,235,0) 100%);
  filter: blur(34px) saturate(1.5);
  mix-blend-mode: multiply;
  opacity: .14;
  transform: translateX(-40%) skewX(-8deg);
  animation: nm-prism 90s linear infinite;
}
@keyframes nm-prism {
  0%   { transform: translateX(-60%) skewX(-8deg); }
  100% { transform: translateX(320%) skewX(-8deg); }
}

/* =========================================================================
   ROOM II — 常設展「シングル」: the darkroom (茄子紺 #1E1726)
   The wall colour comes from body[data-room="collection"]. Works glow.
   ========================================================================= */
.nm-collection { position: relative; }
/* 暗室の床: a faint polished-floor sheen across the lower half */
.nm-collection::before {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 42%;
  background: linear-gradient(180deg, transparent, rgba(255,247,224,.05) 55%, rgba(120,150,210,.07));
  pointer-events: none; z-index: 0;
}
.nm-highlights { position: relative; z-index: 1; width: var(--w); margin: 0 auto clamp(36px, 6vh, 72px); }
.nm-highlights__head {
  font-family: var(--ff-jp); font-weight: 700; font-size: 1rem; letter-spacing: .08em;
  color: var(--room-fg);
  margin-bottom: 18px; display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
}
.nm-highlights__head span { font-family: var(--ff-disp); font-style: italic; font-size: .72rem; letter-spacing: .18em; color: var(--room-brass); }
.nm-highlights__list { display: grid; gap: 10px; }
/* each highlight = a lit little window in the dark */
.nm-hl {
  display: grid; grid-template-columns: 28px 1fr auto; align-items: baseline; gap: 14px;
  padding: 10px 16px;
  background:
    linear-gradient(120deg, rgba(255,247,224,.08), transparent 60%),
    var(--room-paper);
  border: 1px solid var(--room-line); border-left: 3px solid var(--room-brass);
  box-shadow: 0 0 24px -8px rgba(255,247,224,.18), 0 14px 30px -22px #000;
}
.nm-hl__rank { font-family: var(--ff-disp); font-style: italic; color: var(--room-brass); font-size: .9rem; }
.nm-hl__title { font-family: var(--ff-jp); font-weight: 500; font-size: .94rem; color: var(--room-fg); }
.nm-hl__views { font-family: var(--ff-disp); font-weight: 500; font-variant-numeric: tabular-nums; font-size: .9rem; color: #E7D8B0; }
.nm-hl__views small { font-family: var(--ff-ui); font-size: .58rem; letter-spacing: .14em; color: var(--room-dim); margin-left: 6px; }

/* corridor (sticky horizontal) */
.nm-corridor { height: 500vh; position: relative; z-index: 1; }
.nm-corridor__sticky {
  position: sticky; top: 0; height: 100svh;
  display: grid; align-content: center;
  overflow: hidden;
}
.nm-corridor__rail {
  display: flex; align-items: center; gap: clamp(40px, 6vw, 96px);
  padding: 0 max(8vw, 80px);
  will-change: transform;
}
/* one artwork on the wall — dim until the spotlight reaches it (20% in dark) */
.nm-piece {
  flex: 0 0 auto;
  position: relative;
  width: clamp(260px, 30vw, 420px);
  display: grid; gap: 18px; justify-items: center;
  transition: transform .55s var(--ease), filter .55s var(--ease);
  filter: brightness(.22) saturate(.55);     /* unlit ≈ 20% illumination */
  transform: translateY(10px);
}
.nm-piece.is-lit { filter: brightness(1.08) saturate(1.02); transform: translateY(0); }
.nm-piece__lamp {
  /* spotlight cone — crisp in the darkroom */
  position: relative; width: 100%;
}
.nm-piece__lamp::before {
  content: ""; position: absolute; left: 50%; top: -78%; width: 168%; height: 190%;
  transform: translateX(-50%);
  background: radial-gradient(58% 50% at 50% 0%, var(--room-spot), rgba(255,251,238,0) 68%);
  opacity: 0; transition: opacity .55s var(--ease); pointer-events: none; z-index: -1;
  -webkit-clip-path: polygon(43% 0, 57% 0, 100% 100%, 0 100%);
          clip-path: polygon(43% 0, 57% 0, 100% 100%, 0 100%);
}
.nm-piece.is-lit .nm-piece__lamp::before { opacity: .95; }
/* 床の光だまり — an elliptical pool of light cast on the floor below the lit work */
.nm-piece__lamp::after {
  content: ""; position: absolute; left: 50%; bottom: -34%; width: 130%; height: 34%;
  transform: translateX(-50%);
  background: radial-gradient(50% 50% at 50% 50%, var(--room-spot), rgba(255,251,238,0) 70%);
  opacity: 0; transition: opacity .55s var(--ease); pointer-events: none; z-index: -2;
  filter: blur(3px);
}
.nm-piece.is-lit .nm-piece__lamp::after { opacity: .5; }
.nm-piece__frame { position: relative; width: 100%; aspect-ratio: 16/10; }
.nm-piece__frame .nm-frame { width: 100%; height: 100%; padding: 9px; }
.nm-piece__thumb { position: relative; width: 100%; height: 100%; overflow: hidden; background: #e7e2d8; }
.nm-piece__thumb img { width: 100%; height: 100%; object-fit: cover; }

/* 磨かれた床の反射 — a flipped copy of the work, faint and blurred (app.js clones the img) */
.nm-piece__reflect {
  position: absolute; left: 0; right: 0; top: calc(100% + 6px);
  height: 56%;
  overflow: hidden; pointer-events: none; z-index: -1;
  opacity: 0; transition: opacity .55s var(--ease);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.5), transparent 86%);
          mask-image: linear-gradient(180deg, rgba(0,0,0,.5), transparent 86%);
}
.nm-piece__reflect img {
  width: 100%; height: auto; display: block;
  transform: scaleY(-1);
  opacity: .14; filter: blur(3px) saturate(.7);
}
.nm-piece.is-lit .nm-piece__reflect { opacity: 1; }
/* early-years works without footage hang as typographic pieces on linen */
.nm-piece__textart {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 18px; text-align: center;
  background: linear-gradient(160deg, #F1ECE1, #E9E3D5);
}
.nm-piece__textart b {
  font-family: var(--ff-jp); font-weight: 700; font-size: clamp(.9rem, 1.3vw, 1.15rem);
  letter-spacing: .14em; line-height: 1.7; color: var(--ink);
}
.nm-piece__textart i {
  font-family: var(--ff-disp); font-style: italic; font-size: .7rem;
  letter-spacing: .22em; color: var(--brass);
}
.nm-piece__textart u {
  position: absolute; right: 10px; bottom: 8px; text-decoration: none;
  width: 20px; height: 20px; display: grid; place-items: center;
  font-family: var(--ff-jp); font-size: .6rem; color: #fff;
  background: var(--murasaki); border-radius: 3px; opacity: .85;
}
.nm-piece__play {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #fff; font-size: 1.6rem;
  background: rgba(33,29,38,.18); opacity: 0; transition: opacity .3s var(--ease);
}
button.nm-piece:hover .nm-piece__play { opacity: 1; }
.nm-piece__nameplate {
  position: absolute; left: 50%; bottom: -13px; transform: translateX(-50%);
  white-space: nowrap;
}
.nm-piece__placard { text-align: center; display: grid; gap: 2px; }
.nm-piece--empty .nm-frame { display: grid; place-items: center; border-style: dashed; }
.nm-piece--empty .nm-piece__thumb { background: repeating-linear-gradient(45deg, #efeadf 0 10px, #e8e2d6 10px 20px); display: grid; place-items: center; }
.nm-piece--empty .nm-empty-label { font-family: var(--ff-disp); font-style: italic; color: var(--brass); font-size: .9rem; letter-spacing: .12em; text-align: center; padding: 16px; }
button.nm-piece { cursor: pointer; }

.nm-corridor__progress {
  position: absolute; left: max(8vw, 80px); right: max(8vw, 80px); bottom: 7vh; height: 2px;
  background: var(--room-line);
}
.nm-corridor__progress span { display: block; height: 100%; width: 0; background: #C9B6E8; box-shadow: 0 0 8px rgba(201,182,232,.6); }
.nm-corridor__hint {
  position: absolute; right: max(8vw, 80px); bottom: calc(7vh + 14px);
  font-family: var(--ff-ui); font-size: .6rem; letter-spacing: .2em; text-transform: uppercase; color: var(--room-dim);
}

/* =========================================================================
   ROOM III — 肖像の間 (salon) : 藤鼠の壁, a hand-torch follows the cursor
   ========================================================================= */
.nm-salon { position: relative; overflow: hidden; }
/* the torch — a soft light circle that tracks the pointer (app.js, lerp).
   screen-blended so it lifts the dusk-violet wall as you walk past frames. */
.nm-salon__torch {
  position: absolute; top: 0; left: 0; width: 600px; height: 600px;
  margin: -300px 0 0 -300px;       /* centre the circle on its transform origin */
  border-radius: 50%;
  background: radial-gradient(50% 50% at 50% 50%, rgba(255,247,224,.5), rgba(255,247,224,.12) 42%, transparent 70%);
  mix-blend-mode: screen; pointer-events: none; z-index: 1;
  opacity: 0; transition: opacity .6s var(--ease);
  will-change: transform;
}
.nm-salon.is-torch .nm-salon__torch { opacity: 1; }
.nm-salon__wall {
  position: relative; z-index: 0;
  width: var(--w); margin: 0 auto;
  min-height: 60vh;
}
/* fallback grid (when salon.js absent) */
.nm-salon__wall.nm-salon--fallback {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: clamp(16px, 2.5vw, 28px);
}
.nm-portrait { display: grid; gap: 8px; cursor: pointer; }
.nm-portrait__frame { aspect-ratio: 3/4; }
.nm-portrait__frame .nm-frame { width: 100%; height: 100%; padding: 7px; }
.nm-portrait__name { font-family: var(--ff-jp); font-weight: 500; font-size: .8rem; text-align: center; letter-spacing: .04em; color: var(--room-fg); }
.nm-portrait__grad { font-family: var(--ff-ui); font-size: .56rem; letter-spacing: .14em; color: #C9B6E8; text-align: center; }

/* spotlight modal */
.nm-spot { position: fixed; inset: 0; z-index: 150; display: grid; place-items: center; }
.nm-spot__scrim { position: absolute; inset: 0; background: rgba(33,29,38,.55); border: 0; cursor: zoom-out; opacity: 0; transition: opacity .4s var(--ease); }
.nm-spot.is-open .nm-spot__scrim { opacity: 1; }
.nm-spot__stage {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: minmax(200px, 320px) minmax(240px, 360px); gap: clamp(24px, 4vw, 56px);
  align-items: center;
  width: min(820px, 92vw);
  opacity: 0; transform: scale(.96); transition: opacity .4s var(--ease), transform .4s var(--ease);
}
.nm-spot.is-open .nm-spot__stage { opacity: 1; transform: none; }
.nm-spot__portrait { position: relative; }
.nm-spot__portrait::before {
  content: ""; position: absolute; left: 50%; top: -45%; width: 130%; height: 180%; transform: translateX(-50%);
  background: radial-gradient(50% 46% at 50% 30%, rgba(255,251,238,.5), transparent 70%);
  pointer-events: none; z-index: -1;
}
.nm-spot__portrait .nm-frame { width: 100%; }
.nm-spot__portrait img { aspect-ratio: 3/4; width: 100%; object-fit: cover; }
.nm-spot__placard { background: var(--paper); color: var(--ink); }
.nm-spot__name { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.4rem, 3vw, 1.9rem); letter-spacing: .06em; }
.nm-spot__kana { font-family: var(--ff-ui); font-size: .76rem; letter-spacing: .14em; opacity: .6; }
.nm-spot__romaji { font-family: var(--ff-disp); font-style: italic; letter-spacing: .14em; color: var(--brass); font-size: .82rem; margin-top: 2px; }
.nm-spot__rows { margin-top: 16px; display: grid; gap: 7px; border-top: 1px solid var(--line); padding-top: 14px; }
.nm-spot__row { display: grid; grid-template-columns: 5.5em 1fr; gap: 10px; font-size: .82rem; }
.nm-spot__row dt { font-family: var(--ff-ui); font-weight: 600; letter-spacing: .1em; font-size: .66rem; text-transform: uppercase; opacity: .55; align-self: center; }
.nm-spot__row dd { font-family: var(--ff-jp); }
.nm-spot__ig { display: inline-flex; margin-top: 14px; font-family: var(--ff-disp); font-style: italic; letter-spacing: .1em; color: var(--murasaki); border-bottom: 1px solid var(--murasaki); padding-bottom: 1px; font-size: .82rem; }
.nm-spot__grad { display: inline-block; margin-top: 14px; font-family: var(--ff-ui); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: #fff; background: var(--murasaki); padding: 4px 12px; }
.nm-spot__close {
  position: absolute; top: -42px; right: 0; width: 36px; height: 36px;
  display: grid; place-items: center; color: #fff; font-size: 1.4rem; line-height: 1;
}

/* =========================================================================
   ROOM IV — 収蔵庫 (drawers)
   ========================================================================= */
/* the cabinet sits in shelf shadow; each drawer front is solid timber */
.nm-archive__cabinet {
  width: min(820px, 90vw); margin: 0 auto; display: grid; gap: 8px;
  padding: 14px; border-radius: 2px;
  background: linear-gradient(180deg, rgba(42,38,32,.06), rgba(42,38,32,.12));
  box-shadow: 0 30px 60px -40px var(--room-shadow) inset;
}
.nm-drawer {
  border: 1px solid rgba(60,48,32,.5);
  /* 木目調: vertical grain stripes + a top-edge highlight (a real drawer face) */
  background:
    linear-gradient(180deg, rgba(255,248,232,.5), transparent 6%, transparent 92%, rgba(40,30,18,.22)),
    repeating-linear-gradient(90deg,
      #A08B6C 0, #A6916F 3px, #9C876A 6px, #AC9774 10px, #9A8568 14px, #A08B6C 18px);
  box-shadow: 0 10px 24px -18px var(--room-shadow), 0 1px 0 rgba(255,248,232,.4) inset;
}
.nm-drawer__handle {
  width: 100%; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px;
  padding: 18px 24px;
  text-align: left;
  transition: background .3s var(--ease);
}
.nm-drawer__handle:hover { background: rgba(255,248,232,.14); }
.nm-drawer__year { font-family: var(--ff-disp); font-weight: 700; font-size: clamp(1.2rem, 3vw, 1.8rem); font-variant-numeric: tabular-nums; letter-spacing: .02em; color: #2E2316; text-shadow: 0 1px 0 rgba(255,248,232,.5); }
.nm-drawer__meta { font-family: var(--ff-jp); font-size: .8rem; color: #44351F; justify-self: start; }
/* brass pull */
.nm-drawer__pull {
  width: 56px; height: 12px; border-radius: 6px;
  background: linear-gradient(180deg, #c9b88b, var(--brass));
  border: 1px solid #8d7a52;
  box-shadow: 0 1px 0 rgba(255,255,255,.45) inset, 0 4px 8px -4px var(--shadow-d);
}
.nm-drawer__body {
  max-height: 0; overflow: hidden;
  transform: translateY(-6px);
  transition: max-height .5s var(--ease), transform .5s var(--ease), opacity .4s var(--ease);
  opacity: 0;
  background: var(--room-paper);   /* the drawer's paper-lined interior */
}
.nm-drawer.is-open .nm-drawer__body { max-height: 600px; transform: none; opacity: 1; }
.nm-drawer.is-open .nm-drawer__handle { background: rgba(255,248,232,.18); }
.nm-drawer__inner { padding: 6px 24px 24px; border-top: 1px dashed rgba(60,48,32,.4); color: var(--room-fg); }
.nm-drawer__inner ul { display: grid; gap: 8px; margin: 14px 0; }
.nm-drawer__single { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: baseline; }
.nm-drawer__no { font-family: var(--ff-disp); font-style: italic; color: var(--brass); font-size: .8rem; }
.nm-drawer__title { font-family: var(--ff-jp); font-weight: 500; font-size: .92rem; }
.nm-drawer__lives { font-family: var(--ff-ui); font-size: .62rem; letter-spacing: .18em; text-transform: uppercase; opacity: .55; }
.nm-drawer__empty { font-family: var(--ff-disp); font-style: italic; color: var(--brass); opacity: .7; font-size: .82rem; margin: 12px 0; }

/* =========================================================================
   ROOM V — 特別展示室 : built like an exhibition poster (斜行・巨大数字)
   ========================================================================= */
.nm-special { position: relative; overflow: hidden; }
/* 巨大な「41」: a Playfair numeral bleeding off the lower-right corner */
.nm-special__numeral {
  position: absolute; right: -3vw; bottom: -10vh; z-index: 0;
  font-family: var(--ff-disp); font-weight: 700; font-style: italic;
  font-size: clamp(300px, 40vw, 640px); line-height: .8;
  color: var(--murasaki); opacity: .07; pointer-events: none; user-select: none;
}
/* 「特別展」: a vertical purple band running down the left edge */
.nm-special__vlabel {
  position: absolute; left: clamp(8px, 3vw, 40px); top: clamp(120px, 18vh, 220px); z-index: 1;
  writing-mode: vertical-rl; text-orientation: upright;
  font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.1rem, 2.6vw, 1.7rem); letter-spacing: .22em;
  color: #fff; background: linear-gradient(180deg, var(--murasaki), var(--m-deep));
  padding: 18px 8px; box-shadow: 0 16px 36px -22px var(--room-shadow);
  pointer-events: none;
}
.nm-special__grid {
  position: relative; z-index: 1;
  width: var(--w); margin: 0 auto;
  display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(32px, 5vw, 80px); align-items: start;
}
/* slight diagonal — the frame and tour table sit off-axis like poster blocks */
.nm-special__grid .nm-feature { transform: rotate(-1.2deg); transform-origin: center; }
.nm-special__grid .nm-special__tour { transform: rotate(0.8deg); transform-origin: center; }
.nm-feature { display: grid; gap: 22px; }
.nm-feature__frame { position: relative; }
.nm-feature__frame .nm-frame { padding: 14px; border-width: 2px; }
.nm-feature__frame .nm-piece__thumb { aspect-ratio: 16/9; }
.nm-feature__frame .nm-brassplate { position: absolute; left: 50%; bottom: -14px; transform: translateX(-50%); white-space: nowrap; }
.nm-feature__play { position: absolute; inset: 14px; display: grid; place-items: center; color: #fff; font-size: 2rem; background: rgba(33,29,38,.16); opacity: 0; transition: opacity .3s var(--ease); }
button.nm-feature__btn:hover .nm-feature__play { opacity: 1; }
button.nm-feature__btn { display: block; width: 100%; cursor: pointer; }
.nm-feature__title { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.3rem, 3vw, 1.9rem); letter-spacing: .04em; }
.nm-feature__meta { font-family: var(--ff-disp); font-style: italic; color: var(--brass); letter-spacing: .04em; }
.nm-feature__tracks { display: grid; gap: 5px; margin-top: 6px; border-top: 1px solid var(--line); padding-top: 12px; }
.nm-feature__tracks li { font-family: var(--ff-jp); font-size: .84rem; display: grid; grid-template-columns: auto 1fr; gap: 10px; }
.nm-feature__tracks .nm-tk-c { font-family: var(--ff-ui); font-size: .62rem; letter-spacing: .12em; color: var(--murasaki); align-self: center; }

.nm-special__tour-head { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.1rem, 2.4vw, 1.5rem); letter-spacing: .06em; margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.nm-special__tour-list { display: grid; gap: 2px; }
.nm-tour {
  display: grid; grid-template-columns: 5.4em 1fr; gap: 16px; align-items: baseline;
  padding: 14px 0; border-bottom: 1px solid var(--line-2);
}
.nm-tour__date { font-family: var(--ff-disp); font-weight: 500; font-variant-numeric: tabular-nums; font-size: .9rem; color: var(--m-deep); }
.nm-tour__city { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1rem, 2vw, 1.3rem); letter-spacing: .06em; }
.nm-tour__venue { font-family: var(--ff-ui); font-size: .72rem; opacity: .6; margin-top: 2px; }
.nm-tour__today { display: inline-block; margin-left: 10px; font-family: var(--ff-ui); font-size: .58rem; letter-spacing: .16em; text-transform: uppercase; color: #fff; background: var(--murasaki); padding: 2px 9px; vertical-align: middle; }

/* =========================================================================
   ミュージアムショップ : evening lamps, a warm vignette
   ========================================================================= */
.nm-shop { position: relative; }
.nm-shop::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(120% 80% at 50% 36%, rgba(255,228,180,.16), transparent 60%),
    radial-gradient(140% 120% at 50% 120%, rgba(40,28,12,.16), transparent 60%);
}
.nm-shop__grid { position: relative; z-index: 1; width: var(--w); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 3vw, 36px); }
.nm-shop__card {
  position: relative; display: grid; gap: 10px; align-content: start;
  padding: 34px 26px 30px;
  background: var(--room-paper); border: 1px solid var(--room-line); color: var(--room-fg);
  box-shadow: 0 14px 34px -26px var(--room-shadow);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), background .9s var(--ease-soft);
}
.nm-shop__card::before {
  content: ""; position: absolute; top: 14px; left: 50%; transform: translateX(-50%);
  width: 44px; height: 7px; border-radius: 4px;
  background: linear-gradient(180deg, #c9b88b, var(--brass)); border: 1px solid #8d7a52;
}
.nm-shop__card:hover { transform: translateY(-3px); box-shadow: 0 22px 44px -26px var(--room-shadow); }
.nm-shop__plate { font-family: var(--ff-jp); font-weight: 700; font-size: 1.2rem; letter-spacing: .06em; margin-top: 8px; }
.nm-shop__url { font-family: var(--ff-disp); font-style: italic; color: var(--room-brass); letter-spacing: .08em; font-size: .86rem; }
.nm-shop__note { font-family: var(--ff-jp); font-size: .82rem; line-height: 1.8; color: var(--room-dim); }

/* =========================================================================
   芳名帳 — guestbook : the museum after closing. One lamp in the dark.
   ========================================================================= */
.nm-guestbook {
  position: relative;
  padding: clamp(120px, 20vh, 240px) 0 clamp(96px, 14vh, 160px);
  display: grid; justify-items: center; text-align: center; gap: 14px;
  width: var(--w); margin: 0 auto;
}
/* the lamp's pool of light — only the closing words sit inside it */
.nm-guestbook__lamp {
  position: absolute; left: 50%; top: 38%; transform: translate(-50%, -50%);
  width: min(760px, 90vw); height: min(520px, 70vh);
  pointer-events: none; z-index: 0;
  background: radial-gradient(50% 50% at 50% 42%,
    rgba(255,238,200,.16), rgba(255,238,200,.06) 40%, transparent 72%);
  mix-blend-mode: screen;
}
.nm-guestbook > * { position: relative; z-index: 1; }
.nm-guestbook__ja { font-family: var(--ff-jp); font-weight: 700; font-size: clamp(1.2rem, 3vw, 1.8rem); letter-spacing: .1em; color: var(--room-fg); }
.nm-guestbook__en { font-family: var(--ff-disp); font-style: italic; color: var(--room-brass); letter-spacing: .14em; }
.nm-colophon { margin-top: 36px; display: grid; gap: 6px; max-width: 540px; }
.nm-colophon p { font-family: var(--ff-ui); font-size: .68rem; line-height: 1.8; letter-spacing: .02em; color: var(--room-dim); }
.nm-colophon a { border-bottom: 1px solid var(--room-line); }
/* the 落款 sits just outside the light — a faint seal in the dark */
.nm-seal {
  margin-top: 30px;
  font-family: var(--ff-jp); font-weight: 700; font-size: .82rem; line-height: 1.1; letter-spacing: .1em;
  color: #fff; background: var(--murasaki);
  width: 40px; height: 64px;
  display: grid; place-items: center;
  box-shadow: 0 6px 16px -10px #000;
  opacity: .55;
}

/* =========================================================================
   FLOOR MAP overlay
   ========================================================================= */
.nm-map { position: fixed; inset: 0; z-index: 160; display: grid; place-items: center; }
.nm-map__scrim { position: absolute; inset: 0; background: rgba(33,29,38,.4); border: 0; opacity: 0; transition: opacity .4s var(--ease); }
.nm-map.is-open .nm-map__scrim { opacity: 1; }
.nm-map__sheet {
  position: relative; z-index: 1;
  width: min(680px, 92vw);
  background: var(--paper); border: 1px solid var(--ink);
  box-shadow: 0 40px 90px -40px var(--shadow-d), 0 0 0 5px var(--gallery) inset;
  padding: clamp(20px, 4vw, 36px);
  opacity: 0; transform: translateY(10px) scale(.98); transition: opacity .4s var(--ease), transform .4s var(--ease);
}
.nm-map.is-open .nm-map__sheet { opacity: 1; transform: none; }
.nm-map__head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 18px; }
.nm-map__title { font-family: var(--ff-jp); font-weight: 700; font-size: 1.2rem; letter-spacing: .1em; }
.nm-map__title span { font-family: var(--ff-disp); font-style: italic; color: var(--brass); font-size: .76rem; letter-spacing: .22em; margin-left: 10px; }
.nm-map__close { width: 34px; height: 34px; display: grid; place-items: center; font-size: 1.3rem; }
.nm-map__plan { width: 100%; height: auto; }
.nm-wall { fill: transparent; stroke: var(--ink); stroke-width: 1.5; }
.nm-wall--outer { stroke-width: 2; }
.nm-room-g { cursor: pointer; }
.nm-room-g:hover rect { fill: rgba(107,79,160,.07); }
.nm-room-g:hover .nm-room-label { fill: var(--murasaki); }
.nm-room-label { font-family: var(--ff-jp); font-weight: 500; font-size: 12px; fill: var(--ink); text-anchor: middle; }
.nm-room-no { font-family: "Playfair Display", serif; font-style: italic; font-size: 9px; fill: var(--brass); text-anchor: middle; }
.nm-corr-line { stroke: var(--line); stroke-width: 1.5; stroke-dasharray: 3 3; }
.nm-you { fill: var(--murasaki); stroke: #fff; stroke-width: 1.5; transition: cx .5s var(--ease), cy .5s var(--ease); }
.nm-map__legend { margin-top: 16px; font-family: var(--ff-ui); font-size: .66rem; letter-spacing: .16em; text-transform: uppercase; color: var(--murasaki); }

/* =========================================================================
   YOUTUBE THEATER (facade)
   ========================================================================= */
.nm-theater { position: fixed; inset: 0; z-index: 170; display: grid; place-items: center; }
.nm-theater__scrim { position: absolute; inset: 0; background: rgba(33,29,38,.78); border: 0; opacity: 0; transition: opacity .4s var(--ease); }
.nm-theater.is-open .nm-theater__scrim { opacity: 1; }
.nm-theater__box {
  position: relative; z-index: 1;
  width: min(1120px, 92vw); aspect-ratio: 16/9;
  background: #000; border: 1px solid var(--ink);
  box-shadow: 0 40px 100px -40px #000, 0 0 0 8px var(--paper);
  opacity: 0; transform: scale(.96); transition: opacity .4s var(--ease), transform .4s var(--ease);
}
.nm-theater.is-open .nm-theater__box { opacity: 1; transform: none; }
.nm-theater__frame { position: absolute; inset: 0; }
.nm-theater__frame iframe { width: 100%; height: 100%; border: 0; }
.nm-theater__close { position: absolute; top: -44px; right: 0; width: 38px; height: 38px; display: grid; place-items: center; color: #fff; font-size: 1.5rem; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 860px) {
  :root { --pad: clamp(72px, 12vh, 120px); }
  .nm-stats { grid-template-columns: repeat(2, 1fr); gap: 22px 36px; }
  .nm-banner { display: none; }            /* banners off on small screens */
  .nm-spot__stage { grid-template-columns: 1fr; gap: 20px; width: min(440px, 90vw); }
  .nm-spot__portrait { max-width: 240px; margin: 0 auto; }
  .nm-special__grid { grid-template-columns: 1fr; gap: 48px; }
  .nm-shop__grid { grid-template-columns: 1fr; }
  .nm-guide { padding: 6px 11px 6px 8px; }
  .nm-guide__name { font-size: .74rem; }

  /* corridor -> horizontal scroll-snap (no sticky scrub) */
  .nm-corridor { height: auto; }
  .nm-corridor__sticky { position: static; height: auto; overflow: visible; padding: 8px 0 40px; }
  .nm-corridor__rail {
    overflow-x: auto; scroll-snap-type: x mandatory;
    padding: 12px max(6vw, 20px) 28px;
    -webkit-overflow-scrolling: touch;
    transform: none !important;
  }
  .nm-piece { scroll-snap-align: center; width: min(76vw, 320px); filter: brightness(1) saturate(1); transform: none; }
  .nm-piece__lamp::before, .nm-piece__lamp::after { display: none; }
  .nm-piece__reflect { display: none; }
  .nm-corridor__progress, .nm-corridor__hint { display: none; }

  /* poster composition stacks upright on small screens */
  .nm-special__grid .nm-feature,
  .nm-special__grid .nm-special__tour { transform: none; }
  .nm-special__vlabel { display: none; }
  .nm-special__numeral { font-size: 56vw; bottom: -4vh; opacity: .05; }
  /* white-room work returns to a single column */
  .nm-white__center { grid-template-columns: 1fr; }
  .nm-artwork--words { grid-column: 1; max-width: 100%; justify-items: center; text-align: center; }
  .nm-artwork--words .nm-placard { justify-self: center; }
  .nm-white__prism { left: 10%; width: 80%; }
  /* hall returns to a calmer left-aligned stack; emboss recedes */
  .nm-hall__emboss { font-size: 70vw; opacity: .4; right: -10vw; }
  .nm-placard--intro { justify-self: start; margin-right: 0; }
}

@media (max-width: 520px) {
  .nm-salon__wall.nm-salon--fallback { grid-template-columns: repeat(2, 1fr); }
}

/* =========================================================================
   prefers-reduced-motion — full compliance
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .nm-banner { animation: none; }
  [data-reveal] { opacity: 1; transform: none; }
  /* corridor falls back to vertical/snap, scrub disabled in JS */
  .nm-corridor { height: auto; }
  .nm-corridor__sticky { position: static; height: auto; overflow: visible; padding: 20px 0; }
  .nm-corridor__rail { flex-wrap: wrap; justify-content: center; transform: none !important; gap: 32px; padding: 0 6vw; }
  .nm-piece { filter: brightness(1) saturate(1); transform: none; width: clamp(220px, 40vw, 320px); }
  .nm-piece__lamp::before, .nm-piece__lamp::after { display: none; }
  .nm-piece__reflect { display: none; }
  .nm-corridor__progress, .nm-corridor__hint { display: none; }
  .nm-drawer__body { transition: none; }

  /* new scenography effects all freeze for reduced-motion */
  .nm-white__prism { animation: none; display: none; }
  .nm-lintel__ja::after { animation: none; display: none; }
  .nm-frame::after { display: none; }                  /* no glass sweep */
  .nm-salon__torch { display: none; }                  /* no cursor torch */
  .nm-light { display: none; }                          /* light.js also self-disables; belt & braces */
  /* the body still cross-fades colour, but instantly (transition zeroed above),
     so each room still reads in its own key — static success per §6 */
}