/* 3D教材集 — 画面全体のスタイル
   テーマは2種類：ノート（明るい紙に青黒インクと朱）／黒板（深緑の板に白と黄のチョーク） */

:root{
  --f-ui:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic UI","Yu Gothic","Noto Sans JP","Noto Sans CJK JP",Meiryo,system-ui,sans-serif;
  --f-disp:"Hiragino Mincho ProN","Yu Mincho","YuMincho","Noto Serif JP","Noto Serif CJK JP",serif;
  --f-math:"Times New Roman","STIX Two Text","Latin Modern Roman",Times,serif;
  --panel-w:340px;
  /* ノート */
  --bg:#eef1f4; --panel:#f7f9fb; --raise:#ffffff; --stage:#fcfdfe;
  --ink:#1c2733; --muted:#5a6876; --faint:#8a96a3; --line:#d6dde5; --grid:#cdd6df;
  --primary:#1f55b5; --primary-ink:#ffffff; --primary-soft:#e6eefb;
  --accent:#d6452b; --accent-soft:#fbe6e0; --sel:#ffe9a8; --sel3d:#ffcf40;
  --warn-bg:#fff1e3; --warn-ink:#8a3b00;
  --face:#e6ecf3; --glass:#8fb0d6; --floor:#eef2f6;
  --c-blue:#2f7fd6; --c-red:#d6452b; --c-green:#2f9a68; --c-yellow:#dfa000; --c-purple:#7a55c7;
  --c-orange:#ea7a1c; --c-teal:#1c97a8; --c-pink:#d85c8c; --c-brown:#9a6a45; --c-gray:#8492a0; --c-white:#f4f6f8; --c-dark:#3c4651;
  --water:#1e88e5; --pump:#ef7a1a; --res:#b4533a; --lamp:#d9a400; --amm:#1f9a6b; --vm:#7b4cc9;
  --wire:#9db8cc; --pad:#5d7488; --step:#7a3020; --sw:#7d8b97; --bulb:#fff4c2;
  color-scheme:light;
}
:root[data-theme="board"]{
  --bg:#121b19; --panel:#17221f; --raise:#1f2c28; --stage:#1b2824;
  --ink:#edece4; --muted:#a6b5ae; --faint:#7f8f88; --line:#2f403a; --grid:#3b4e47;
  --primary:#8cc4ea; --primary-ink:#10202a; --primary-soft:#243a44;
  --accent:#f3d15a; --accent-soft:#473f1c; --sel:#6b5a1d; --sel3d:#ffd75e;
  --warn-bg:#3a2410; --warn-ink:#ffc98f;
  --face:#31433d; --glass:#9cc3d6; --floor:#22312c;
  --c-blue:#7fbdf0; --c-red:#f08a7a; --c-green:#8fd4a0; --c-yellow:#f3d15a; --c-purple:#b9a2ee;
  --c-orange:#f2a45c; --c-teal:#6ccfd6; --c-pink:#f0a3c0; --c-brown:#c9a07c; --c-gray:#9aa9a2; --c-white:#edece4; --c-dark:#55655f;
  --water:#58aef5; --pump:#f59a45; --res:#d9735a; --lamp:#f0c23a; --amm:#4cc494; --vm:#a98be8;
  --wire:#6f8a9c; --pad:#8fa3b3; --step:#a8503c; --sw:#93a1ab; --bulb:#fff4c2;
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html,body{height:100%;margin:0;overflow:hidden;overscroll-behavior:none}
body{background:var(--bg);color:var(--ink);font-family:var(--f-ui);font-size:15px;line-height:1.6;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}
h1,h2,h3,p{margin:0}
button{font:inherit;color:inherit}
[hidden]{display:none!important}

/* ---------- 全体の枠 ---------- */
.app{height:100vh;height:100dvh;display:grid;grid-template-rows:auto minmax(0,1fr)}
.bar{display:flex;align-items:center;gap:6px 14px;flex-wrap:wrap;min-height:54px;padding:8px 14px;
  padding-top:calc(8px + env(safe-area-inset-top,0px));padding-left:calc(14px + env(safe-area-inset-left,0px));padding-right:calc(14px + env(safe-area-inset-right,0px));
  background:var(--panel);border-bottom:1px solid var(--line)}
.back{display:inline-flex;align-items:center;gap:6px;height:38px;padding:0 12px 0 8px;border:1px solid var(--line);border-radius:9px;background:var(--raise);
  color:var(--ink);text-decoration:none;font-size:14px;white-space:nowrap}
.back svg{width:16px;height:16px;flex:none}
.ttl{display:flex;align-items:baseline;gap:10px;min-width:0;flex:1 1 180px}
.ttl h1{font-family:var(--f-disp);font-weight:600;font-size:21px;letter-spacing:.04em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ttl-subj{flex:none;font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:1px 9px;white-space:nowrap}
.tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end;margin-left:auto}

.work{position:relative;display:grid;grid-template-columns:var(--panel-w) minmax(0,1fr);min-height:0}
.app[data-panel="wide"]{--panel-w:min(460px,42vw)}
.app[data-view="home"]{--panel-w:min(580px,50vw)}
.panel{min-height:0;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;background:var(--panel);border-right:1px solid var(--line);
  padding:14px 16px calc(28px + env(safe-area-inset-bottom,0px));padding-left:calc(16px + env(safe-area-inset-left,0px))}
.view{position:relative;min-width:0;min-height:0}
.stage{position:absolute;inset:0;overflow:hidden;background:var(--stage)}
.g3-canvas{position:absolute;left:0;top:0;display:block;touch-action:none;cursor:grab;outline:none}
.g3-canvas:active{cursor:grabbing}
.g3-labels{position:absolute;inset:0;pointer-events:none;overflow:hidden}

/* 拡大：ブラウザの表示領域いっぱいに3Dを広げる（フルスクリーン機能は使わない） */
.app.expanded .work{grid-template-columns:minmax(0,1fr)}
.app.expanded .panel{display:none}
.app.expanded.panel-open .panel{display:block;position:absolute;z-index:6;left:0;top:0;bottom:0;width:min(360px,88vw);box-shadow:8px 0 28px rgba(0,0,0,.16)}
.app.expanded .ttl-subj{display:none}

/* ---------- ボタン類 ---------- */
.btn,.tools button,.seg button,.chip,.step{touch-action:manipulation;-webkit-user-select:none;user-select:none;cursor:pointer}
.btn,.tools>button{height:38px;padding:0 13px;border:1px solid var(--line);border-radius:9px;background:var(--raise);font-size:14px;white-space:nowrap}
.btn:hover,.tools>button:hover,.back:hover,.chip:hover{border-color:var(--primary)}
.btn[aria-pressed="true"],.tools>button[aria-pressed="true"]{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}
.btn.primary{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}
.btn.wide{width:100%}
.btn:disabled{opacity:.45;cursor:default}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

.seg{display:inline-flex;align-items:center;max-width:100%;padding:2px;border:1px solid var(--line);border-radius:10px;background:var(--raise)}
.seg>span{font-size:12.5px;color:var(--muted);padding:0 6px 0 9px;white-space:nowrap}
.seg button{min-height:32px;padding:3px 11px;border:0;border-radius:8px;background:none;font-size:14px;white-space:nowrap}
.seg button[aria-pressed="true"]{background:var(--primary);color:var(--primary-ink)}
.seg.full{display:flex}.seg.full button{flex:1 1 0;padding-left:4px;padding-right:4px}

.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{min-height:36px;padding:4px 12px;border:1px solid var(--line);border-radius:999px;background:var(--raise);font-size:14px;white-space:nowrap}
.chip[aria-pressed="true"]{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}
.chip small{font-size:11.5px;opacity:.75;margin-left:4px}

/* ---------- 操作パネルの部品 ---------- */
.grp{padding:14px 0;border-top:1px solid var(--line)}
.grp:first-child{border-top:0;padding-top:2px}
.grp h3{font-size:13px;font-weight:700;letter-spacing:.02em;margin-bottom:9px}
.grp>*+*{margin-top:10px}
.grp>h3+*{margin-top:0}
.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.row.between{justify-content:space-between}
.field-label{font-size:13px;color:var(--muted);margin-bottom:5px}
.note{font-size:13px;color:var(--muted);line-height:1.65}
.note b{color:var(--ink);font-weight:700}
.lead{font-size:13.5px;color:var(--muted);line-height:1.7}

.sl{display:block}
.sl-top{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-size:13.5px}
.sl-val{font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}
.sl-ctl{display:flex;align-items:center;gap:6px;margin-top:2px}
.step{flex:none;width:34px;height:34px;border:1px solid var(--line);border-radius:9px;background:var(--raise);font-size:17px;line-height:1;padding:0}
.step:hover{border-color:var(--primary)}
input[type=range]{-webkit-appearance:none;appearance:none;flex:1;min-width:0;height:34px;margin:0;background:none;touch-action:pan-y;cursor:pointer}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:var(--line)}
input[type=range]::-moz-range-track{height:4px;border-radius:2px;background:var(--line)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;margin-top:-10px;border-radius:50%;background:var(--raise);border:2px solid var(--primary);box-shadow:0 1px 3px rgba(0,0,0,.18)}
input[type=range]::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--raise);border:2px solid var(--primary)}
input[type=range]:focus-visible{outline:none}
input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 4px var(--primary-soft),0 1px 3px rgba(0,0,0,.18)}
input[type=range]:focus-visible::-moz-range-thumb{box-shadow:0 0 0 4px var(--primary-soft)}
input[type=number]{font:inherit;width:84px;height:36px;padding:0 8px;border:1px solid var(--line);border-radius:8px;background:var(--raise);color:var(--ink)}

.tg{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:36px;font-size:14px;cursor:pointer}
.tg input{position:absolute;opacity:0;pointer-events:none}
.tg i{flex:none;width:42px;height:24px;border-radius:999px;background:var(--line);position:relative;transition:background .15s}
.tg i::after{content:"";position:absolute;left:2px;top:2px;width:20px;height:20px;border-radius:50%;background:var(--raise);box-shadow:0 1px 2px rgba(0,0,0,.25);transition:transform .15s}
.tg input:checked+i{background:var(--primary)}
.tg input:checked+i::after{transform:translateX(18px)}
.tg input:focus-visible+i{outline:2px solid var(--primary);outline-offset:2px}

.read{margin:0;font-size:14px;font-variant-numeric:tabular-nums}
.read .rw{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:0 14px;padding:2.5px 0}
.read dt{color:var(--muted)}
.read dd{margin:0 0 0 auto;font-weight:700;text-align:right;line-height:1.55}
.read dt:empty{display:none}
.stack>*+*{margin-top:10px}
.read dd.big{font-family:var(--f-disp);font-size:17px;font-weight:600;color:var(--accent)}
.var{font-family:var(--f-math);font-style:italic;font-size:1.08em}
.mth{font-family:var(--f-math);font-style:normal;font-size:1.06em}
.vec{position:relative;display:inline-block;font-family:var(--f-math);font-style:italic;font-size:1.08em;padding-top:.28em;line-height:1}
.vec::after{content:"";position:absolute;left:0;right:0;top:.12em;height:0;border-top:1px solid currentColor}
.vec::before{content:"";position:absolute;right:-1px;top:calc(.12em - 2.5px);border:2.5px solid transparent;border-left:4px solid currentColor;border-right:0}
i.sw{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px;box-shadow:inset 0 0 0 1px rgba(128,128,128,.45)}
.fig{display:block;width:100%;border:1px solid var(--line);border-radius:10px;background:var(--raise)}

details.fold{border-top:1px solid var(--line);padding:10px 0 2px}
details.fold>summary{cursor:pointer;font-size:13px;font-weight:700;list-style:none;display:flex;align-items:center;gap:6px;min-height:30px}
details.fold>summary::-webkit-details-marker{display:none}
details.fold>summary::before{content:"";width:7px;height:7px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(-45deg);transition:transform .15s;margin-right:4px}
details.fold[open]>summary::before{transform:rotate(45deg)}
details.fold ul{margin:6px 0 8px;padding-left:1.3em;font-size:13px;color:var(--muted);line-height:1.7}
details.fold li+li{margin-top:4px}
details.fold p{font-size:13px;color:var(--muted);line-height:1.7;margin:6px 0 8px}

/* ---------- 3D画面の上に重ねるもの ---------- */
.lbl{position:absolute;transform:translate(-50%,-100%);white-space:nowrap;font-size:12.5px;line-height:1.35;padding:2px 7px;border-radius:6px;
  background:var(--panel);background:color-mix(in srgb,var(--panel) 88%,transparent);border:1px solid var(--line);color:var(--ink);font-variant-numeric:tabular-nums}
.lbl b{font-weight:700}
.lbl.pt{background:none;border:0;padding:0;font-family:var(--f-math);font-size:17px;font-weight:700;transform:translate(-50%,-50%);
  text-shadow:0 0 3px var(--stage),0 0 3px var(--stage),0 0 6px var(--stage)}
.lbl.pt.acc{color:var(--accent)}
.lbl.pt.sm{font-size:14px}
.lbl.pt.on-light{color:#1c2733;text-shadow:0 0 3px #fff,0 0 3px #fff}
.lbl.pt.on-dark{color:#fff;text-shadow:0 0 3px rgba(0,0,0,.75),0 0 2px rgba(0,0,0,.75)}
.lbl.txt{background:none;border:0;padding:0;font-size:12.5px;font-weight:700;transform:translate(-50%,-50%);text-shadow:0 0 3px var(--stage),0 0 3px var(--stage),0 0 6px var(--stage)}
.lbl.tick{background:none;border:0;color:var(--muted);transform:translate(-100%,-50%);padding:0 4px;font-size:11px}
.lbl.below{transform:translate(-50%,6px)}
.lbl.right{transform:translate(8px,-50%)}
.lbl.left{transform:translate(calc(-100% - 8px),-50%)}
.lbl.acc{border-color:var(--accent)}
.lbl.sel{background:var(--sel)}
.stage[data-mode="short"] .lbl .l2,.stage[data-mode="short"] .lbl.full-only{display:none}
.stage[data-mode="none"] .lbl:not(.keep):not(.tick){display:none}

.legend{position:absolute;left:12px;bottom:12px;max-width:calc(100% - 24px);display:grid;grid-template-columns:auto auto;gap:3px 10px;padding:7px 10px;
  border:1px solid var(--line);border-radius:9px;background:var(--panel);background:color-mix(in srgb,var(--panel) 90%,transparent);font-size:12px;pointer-events:none}
.legend .sw{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px;box-shadow:inset 0 0 0 1px rgba(128,128,128,.45)}
.legend .ld{color:var(--muted)}
.stage[data-mode="short"] .legend{display:flex;flex-wrap:wrap;gap:3px 12px}
.stage[data-mode="short"] .legend .ld{display:none}
.stage[data-mode="none"] .legend{display:none}

.hud{position:absolute;left:12px;top:12px;max-width:min(360px,calc(100% - 24px));pointer-events:none;font-variant-numeric:tabular-nums}
.hud:empty{display:none}
.hud .hud-box{display:inline-block;padding:8px 12px;border:1px solid var(--line);border-radius:10px;background:var(--panel);background:color-mix(in srgb,var(--panel) 90%,transparent)}
.hud .hud-k{font-size:12px;color:var(--muted)}
.hud .hud-v{font-family:var(--f-disp);font-size:24px;font-weight:600;line-height:1.25;color:var(--accent)}
.hud .hud-s{font-size:13px}
.stage[data-mode="none"] .hud{display:none}
.warn{position:absolute;left:50%;top:12px;transform:translateX(-50%);max-width:min(560px,82%);padding:7px 13px;border:1px solid currentColor;border-radius:10px;
  background:var(--warn-bg);color:var(--warn-ink);font-size:13.5px;z-index:2}
.inset{position:absolute;right:12px;top:12px;border:1px solid var(--line);border-radius:10px;background:var(--panel);background:color-mix(in srgb,var(--panel) 92%,transparent);padding:8px;pointer-events:none}
.inset canvas{display:block}
.inset .cap{font-size:12px;color:var(--muted);text-align:center;margin-top:4px}
.stage[data-mode="none"] .inset .cap{display:none}

/* ---------- 目次 ---------- */
.app[data-view="home"] .back,.app[data-view="home"] .only-mod{display:none}
.app[data-view="home"] .bar{border-bottom-color:transparent;background:var(--panel)}
.app[data-view="home"] .ttl h1{font-size:0}
.toc{padding:6px 10px 20px 8px}
.toc-head h2{font-family:var(--f-disp);font-weight:600;font-size:clamp(34px,4.6vw,52px);line-height:1.2;letter-spacing:.06em}
.toc-head p{margin-top:10px;color:var(--muted);font-size:15px;letter-spacing:.04em}
.toc-subj{display:flex;align-items:center;gap:12px;margin:30px 0 4px;font-family:var(--f-disp);font-weight:600;font-size:15px;letter-spacing:.3em;color:var(--muted)}
.toc-subj::after{content:"";flex:1;height:1px;background:var(--line)}
.toc a{display:grid;grid-template-columns:1fr auto;gap:2px 14px;align-items:baseline;padding:11px 10px 12px 14px;margin:0 -10px 0 -14px;border-radius:10px;
  color:inherit;text-decoration:none;position:relative}
.toc a+a{margin-top:2px}
.toc a::before{content:"";position:absolute;left:3px;top:14px;bottom:14px;width:3px;border-radius:2px;background:var(--accent);opacity:0;transition:opacity .12s}
.toc a:hover,.toc a:focus-visible{background:var(--primary-soft)}
.toc a:hover::before,.toc a:focus-visible::before{opacity:1}
.toc a b{font-family:var(--f-disp);font-weight:600;font-size:22px;letter-spacing:.05em;line-height:1.35}
.toc a i{font-style:normal;font-size:12px;color:var(--muted);white-space:nowrap}
.toc a span{grid-column:1/-1;font-size:13.5px;color:var(--muted);line-height:1.6}
.toc-foot{margin-top:30px;padding-top:14px;border-top:1px solid var(--line);font-size:12.5px;color:var(--faint);line-height:1.8}
.figcap{position:absolute;left:18px;right:18px;bottom:16px;font-size:13px;color:var(--muted);pointer-events:none;line-height:1.6}
.figcap b{font-family:var(--f-disp);font-weight:600;color:var(--ink);margin-right:.8em;letter-spacing:.1em}

.fatal{margin:14vh auto 0;max-width:30em;padding:0 24px;line-height:1.9}
.fatal h2{font-family:var(--f-disp);font-size:24px;margin-bottom:10px}

/* ---------- 電気回路：部品の箱と組み立て盤 ---------- */
.palette{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.pitem{display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 2px 5px;border:1px solid var(--line);border-radius:10px;background:var(--raise);
  touch-action:none;user-select:none;-webkit-user-select:none;cursor:pointer}
.pitem svg{width:44px;height:22px}
.pitem small{font-size:11.5px}
.pitem.on{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}
.edwrap{border:1px solid var(--line);border-radius:12px;background:var(--raise);overflow:hidden}
.edwrap canvas{display:block;width:100%;touch-action:none;cursor:crosshair}
.ghost{position:fixed;pointer-events:none;z-index:50;transform:translate(-50%,-50%);opacity:.85;color:var(--ink)}
.ghost svg{width:54px;height:27px}
.lbl.cir{font-size:9.2px;padding:1.6px 5.6px;border-radius:5.6px}
.lbl.k-battery{border-color:var(--pump)}.lbl.k-resistor{border-color:var(--res)}.lbl.k-lamp{border-color:var(--lamp)}
.lbl.k-ammeter{border-color:var(--amm)}.lbl.k-voltmeter{border-color:var(--vm)}
.legend.cir{font-size:9.6px;padding:6px 8px;gap:2px 8px}
.legend.cir .sw{width:8px;height:8px;border-radius:2px;margin-right:5px}

/* ---------- 画面が狭いとき（縦向きのタブレット・スマートフォン） ---------- */
@media (max-width:860px){
  .work{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(260px,46%) minmax(0,1fr)}
  .view{order:1}
  .panel{order:2;border-right:0;border-top:1px solid var(--line)}
  .app[data-view="home"] .work{grid-template-rows:minmax(200px,34%) minmax(0,1fr)}
  .app.expanded .work{grid-template-rows:minmax(0,1fr)}
  .ttl h1{font-size:18px}
  .bar{padding-bottom:6px}
  .toc{padding-right:0}
}
@media (max-width:560px){
  .tools{width:100%;justify-content:flex-start}
  .seg>span{display:none}
  .ttl-subj{display:none}
  .toc a b{font-size:19px}
}
@media (prefers-reduced-motion:reduce){ *{transition:none!important} }
@media print{ .bar,.panel{display:none} .work{display:block} .app{height:auto} .view{height:90vh} }