/* 耳のしくみ 3D（じぶんの聞こえプロジェクトの色にそろえる） */
:root {
  --primary: #3ABCB1; --primary-dark: #2da99e; --primary-light: #E8F7F6;
  --ink: #1F2D3A; --muted: #566676; --line: #D3DCE3; --paper: #F4F7F8; --panel: #FFFFFF; --chip: #E9EEF2;
  --outer: #4FA3E0; --middle: #F2A33A; --inner: #E0607E; --nerve: #9B7BE0;
  --radius: 12px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: "BIZ UDPゴシック", "BIZ UDPGothic", "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 16px; line-height: 1.75;
}
body.big { font-size: 20px; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
ruby rt { font-size: 0.55em; color: var(--muted); }

.top {
  position: sticky; top: 0; z-index: 10; background: var(--paper); border-bottom: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: center; justify-content: space-between;
  padding: .6rem 1rem;
}
.back { font-size: .85rem; font-weight: 700; color: var(--primary-dark); text-decoration: none; }
.back:hover { text-decoration: underline; }
.top h1 { margin: 0; font-size: 1.4rem; line-height: 1.3; }
.lead { margin: 0; font-size: .85rem; color: var(--muted); max-width: 46em; }
.modes { display: flex; gap: 4px; background: var(--chip); border-radius: 12px; padding: 4px; }
.modes button {
  border: none; background: transparent; border-radius: 9px; min-height: 44px; padding: .2rem 1rem;
  font-weight: 700; color: var(--muted);
}
.modes button[aria-pressed="true"] { background: var(--panel); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.15); }

.grid {
  display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 1rem; align-items: start;
  padding: 1rem; max-width: 1400px; margin: 0 auto;
}
.left { display: flex; flex-direction: column; gap: .8rem; min-width: 0; }
.stage { position: relative; height: clamp(340px, 64vh, 680px); border-radius: 16px; overflow: hidden; background: #17223b; }
.stage canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.labels { position: absolute; inset: 0; pointer-events: none; }
.lab3 {
  position: absolute; transform: translate(-50%, -50%); white-space: nowrap; pointer-events: auto; cursor: pointer;
  font-size: .8rem; line-height: 1.5; color: #fff; background: rgba(12, 20, 38, .72);
  padding: .05rem .55rem; border-radius: 999px;
}
.lab3 rt { color: #cfd9e3; }
.lab3.on { background: #FFC83D; color: #1F2D3A; font-weight: 700; }
.lab3.on rt { color: #4a3a00; }
.view-btns { position: absolute; left: .6rem; top: .6rem; display: flex; gap: .4rem; }
.stage .view-btns .btn { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.3); }
.lab3.sub { background: rgba(255,255,255,.92); color: #1F2D3A; border: 1.5px dashed #FFC83D; font-size: .74rem; }
.lab3.sub rt { color: #566676; }
.stage-hint { position: absolute; left: .8rem; bottom: .4rem; margin: 0; font-size: .76rem; color: #C9D6E3; pointer-events: none; }
.stage-err { position: absolute; inset: 0; margin: 0; display: grid; place-items: center; padding: 2rem; color: #fff; text-align: center; }

.settings { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: .5rem 1rem; }
.settings summary { font-weight: 700; cursor: pointer; }
.toggles { display: flex; flex-wrap: wrap; gap: .3rem 1.4rem; margin: .4rem 0; }
.toggles label { display: flex; align-items: center; gap: .4rem; min-height: 40px; }
.toggles input { width: 22px; height: 22px; accent-color: var(--primary); }
.model-note { font-size: .85rem; color: var(--muted); border-left: 3px solid var(--line); padding-left: .6rem; margin: 0; }

.panel {
  position: sticky; top: 5.5rem; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem 1.1rem; display: flex; flex-direction: column; gap: .8rem;
}
.hint { font-size: .88rem; color: var(--muted); margin: 0; }
.err { color: #b3261e; font-weight: 700; }
.btn { border: 1px solid var(--line); background: var(--panel); border-radius: 10px; padding: .45rem .9rem; min-height: 44px; }
.btn.small { min-height: 36px; padding: .2rem .8rem; font-size: .88rem; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 700; }
.btn:disabled { opacity: .45; cursor: default; }
.btnrow { display: flex; gap: .5rem; }
.btnrow .btn { flex: 1; }

.detail h2 { margin: 0; font-size: 1.25rem; line-height: 1.5; }
.detail-head { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.summary { margin: .4rem 0; }
.points { margin: .3rem 0 .6rem; padding-left: 1.3rem; }
.points li { margin: .2rem 0; }
.analogy { background: #FFF7E0; border-radius: 10px; padding: .5rem .8rem; margin: .4rem 0 .8rem; }
.analogy span { display: inline-block; font-size: .78rem; font-weight: 700; color: #8a6200; margin-right: .5rem; }

.chip { display: inline-block; font-size: .8rem; font-weight: 700; padding: 0 .6rem; border-radius: 999px; color: #fff; }
.chip-outer { background: var(--outer); } .chip-middle { background: var(--middle); }
.chip-inner { background: var(--inner); } .chip-nerve { background: var(--nerve); }
.part-groups { display: flex; flex-direction: column; gap: .6rem; }
.part-group h3 { margin: 0 0 .3rem; font-size: 1rem; }
.part-btns { display: flex; flex-wrap: wrap; gap: .35rem; }
.pbtn { border: 2px solid var(--line); background: var(--panel); border-radius: 10px; min-height: 44px; padding: .1rem .7rem; }
.pbtn-outer { border-color: var(--outer); } .pbtn-middle { border-color: var(--middle); }
.pbtn-inner { border-color: var(--inner); } .pbtn-nerve { border-color: var(--nerve); }
.pbtn[aria-pressed="true"] { background: #FFC83D; border-color: #E0A800; font-weight: 700; }

.steps { display: flex; gap: .35rem; flex-wrap: wrap; }
.sdot { width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--line); background: var(--panel); font-weight: 700; }
.sdot[aria-pressed="true"] { background: var(--primary); border-color: var(--primary); color: #fff; }
.step-no { margin: 0; font-size: .85rem; color: var(--primary-dark); font-weight: 700; }

.loss-tabs { display: flex; gap: .35rem; flex-wrap: wrap; }
.lbtn { flex: 1; min-height: 46px; border-radius: 10px; border: 2px solid var(--line); background: var(--panel); font-weight: 700; }
.lbtn-conductive[aria-pressed="true"] { background: #F2A33A; border-color: #F2A33A; color: #fff; }
.lbtn-sensorineural[aria-pressed="true"] { background: #E0607E; border-color: #E0607E; color: #fff; }
.lbtn-mixed[aria-pressed="true"] { background: #B57BE0; border-color: #B57BE0; color: #fff; }
.loss-dl { margin: .5rem 0; }
.loss-dl dt { font-size: .82rem; font-weight: 700; color: var(--muted); margin-top: .4rem; }
.loss-dl dd { margin: 0 0 .2rem; }
.loss-dl ul { margin: 0; padding-left: 1.2rem; }
.note { font-size: .9rem; background: var(--primary-light); border-radius: 10px; padding: .6rem .8rem; margin: 0; }
.ref { margin: 0; }
.ref img { width: 100%; height: auto; border-radius: 8px; border: 1px solid var(--line); }
.ref figcaption { font-size: .8rem; color: var(--muted); }

@media (max-width: 1000px) {
  .grid { grid-template-columns: 1fr; }
  .panel { position: static; }
}
@media (max-width: 560px) {
  .grid { padding: .6rem; }
  .top { padding: .5rem .7rem; }
  .top h1 { font-size: 1.2rem; }
  .modes { width: 100%; }
  .modes button { flex: 1; padding: .2rem .4rem; }
}