/* =========================================================
   文字の誕生 — Museum / Room M3（世界の文字のはじまり）
   探検UI（困った→発明→まなび）。playful・小学生向け。
   ========================================================= */
:root{
  --ink:#26221c; --paper:#fbf6ec; --grey:#8a8378; --line:rgba(38,34,28,.12); --accent:#c0562b; --ok:#2fa36b;
  --f:"Noto Sans JP","Hiragino Sans",system-ui,sans-serif; --n:"Inter",system-ui,sans-serif;
}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f);line-height:1.7;-webkit-font-smoothing:antialiased}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}
a{color:var(--accent)}

/* hero */
.hero{padding:34px 0 6px;text-align:center}
.hero .eye{font-size:12px;font-weight:800;letter-spacing:.1em;color:var(--accent)}
.hero h1{font-size:clamp(26px,5vw,44px);font-weight:900;margin:12px 0 6px;line-height:1.28}
.hero h1 em{font-style:normal;color:var(--accent);background:linear-gradient(transparent 62%,#ffd9a8 62%)}
.hero .lede{font-size:15px;color:#5a5347;max-width:600px;margin:12px auto 0;text-align:left}
.hero .lede strong{color:var(--ink)}

/* road (timeline) */
.road{display:flex;align-items:flex-start;justify-content:space-between;gap:2px;margin:24px 0 6px;position:relative}
.road::before{content:"";position:absolute;left:6%;right:6%;top:15px;height:3px;background:#e7dcc9;border-radius:3px}
.rstop{position:relative;z-index:1;flex:1;text-align:center;background:none;border:0;cursor:pointer;font-family:var(--f);padding:0}
.rdot{width:32px;height:32px;border-radius:50%;background:#fff;border:3px solid #e0d3bd;color:#b3a891;font-weight:900;font-size:15px;display:flex;align-items:center;justify-content:center;margin:0 auto;transition:.25s;font-family:var(--n)}
.rstop.done .rdot{background:var(--ok);border-color:var(--ok);color:#fff}
.rstop.on .rdot{background:var(--accent);border-color:var(--accent);color:#fff;transform:scale(1.18)}
.rlab{font-size:11px;font-weight:800;margin-top:6px;color:var(--grey);line-height:1.3}
.rstop.on .rlab{color:var(--accent)}
.rera{font-size:9.5px;color:#b3a891;font-weight:700;font-family:var(--n)}

/* stage */
.stage{margin:16px 0 8px;border:2px solid var(--ink);border-radius:18px;background:#fff;overflow:hidden;box-shadow:0 4px 0 rgba(38,34,28,.1)}
.stage .top{padding:16px 22px 4px;display:flex;gap:10px;align-items:baseline;flex-wrap:wrap}
.stage .badge{font-size:11px;font-weight:900;color:#fff;background:var(--accent);border-radius:999px;padding:3px 11px}
.stage .where{font-size:12px;font-weight:800;color:var(--grey)}
.stage .need{padding:2px 22px 0;font-size:clamp(18px,3.2vw,24px);font-weight:900;line-height:1.4}
.stage .need b{color:var(--accent)}
.play{margin:12px 22px 0;background:#fbf6ec;border-radius:14px;padding:18px;display:flex;align-items:center;justify-content:center;gap:20px;min-height:150px;flex-wrap:wrap}
.play .glyph{display:flex;align-items:center;justify-content:center}
.play .glyph svg{width:78px;height:78px}
.play .big{font-size:64px;font-weight:900;line-height:1;font-family:var(--n)}
.play .arrow{font-size:28px;color:#c9bda6;font-weight:900}
.pop{animation:pop .5s cubic-bezier(.34,1.6,.5,1)}
@keyframes pop{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.15)}100%{transform:scale(1)}}
@media(prefers-reduced-motion:reduce){.pop{animation:none}}
.act{padding:14px 22px 4px;text-align:center}
.actbtn{font-family:var(--f);font-weight:900;font-size:16px;color:#fff;background:var(--accent);border:0;border-radius:999px;padding:13px 30px;cursor:pointer;box-shadow:0 4px 0 #8a3d1c}
.actbtn:active{transform:translateY(3px);box-shadow:0 1px 0 #8a3d1c}
.learn{margin:14px 22px 0;background:#eef8f1;border-left:4px solid var(--ok);border-radius:0 10px 10px 0;padding:12px 16px;font-size:14px;line-height:1.7;opacity:0;max-height:0;overflow:hidden;transition:opacity .4s,max-height .4s}
.learn.show{opacity:1;max-height:340px}
.learn b{color:#1f7a4d}
.learn .who{font-size:12px;color:#6a8a76;margin-top:4px}
.nav{display:flex;justify-content:space-between;align-items:center;padding:16px 22px;border-top:1px solid var(--line);margin-top:16px}
.nav button{font-family:var(--f);font-weight:800;font-size:14px;border:1.5px solid var(--ink);background:#fff;color:var(--ink);border-radius:999px;padding:10px 20px;cursor:pointer}
.nav button.pri{background:var(--ink);color:#fff}
.nav button:disabled{opacity:.28;cursor:default}

/* closing */
.closing{margin:24px 0 6px;padding:22px;border:2px dashed #d9b48a;border-radius:16px;background:#fff8ef}
.closing .ct{font-size:20px;font-weight:900;margin:0 0 8px}
.closing .cp{font-size:14.5px;line-height:1.85;color:#4a463d;margin:0}
.closing .cp strong{color:var(--accent)}
.closing .cp2{margin-top:14px;padding-top:13px;border-top:1px dashed #e2c39f;font-size:15px}
.closing .cp2 b{color:var(--accent)}

/* 別の例ボタン */
.moreWrap{text-align:center;padding:12px 22px 0}
.more{font-family:var(--f);font-weight:800;font-size:13.5px;color:var(--accent);background:#fff;border:1.5px solid var(--accent);border-radius:999px;padding:9px 20px;cursor:pointer}
.more:hover{background:#fff2e6}

/* ゴール画面 */
.done-badge{display:inline-block;font-size:12px;font-weight:900;color:#fff;background:var(--ok);border-radius:999px;padding:4px 14px;margin:0 0 8px}
.steps5{font-size:12.5px;font-weight:800;color:var(--grey);margin:0 0 12px;font-family:var(--n)}
.goal-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.gbtn{display:inline-block;font-family:var(--f);font-weight:800;font-size:13.5px;text-decoration:none;color:var(--ink);background:#fff;border:1.5px solid var(--ink);border-radius:999px;padding:11px 18px;cursor:pointer}
.gbtn.pri{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 3px 0 #8a3d1c}
.gbtn.pri:active{transform:translateY(2px);box-shadow:0 1px 0 #8a3d1c}

/* room-nav */
.room-nav{max-width:820px;margin:26px auto 0;padding:20px;display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);font-size:14px;font-weight:700;line-height:1.4}
.room-nav span{flex:1}
.room-nav span.r{text-align:right}
.room-nav a{color:inherit;text-decoration:underline;text-underline-offset:3px}
.room-nav .center{flex:0 0 auto;text-align:center}

/* colophon */
.colophon{background:#26221c;color:#efe7d8;margin-top:34px;padding:34px 0 44px}
.colophon .wrap{max-width:820px}
.colophon__brand{font-size:20px;font-weight:900;margin:0 0 10px}
.colophon__txt{font-size:13.5px;line-height:1.7;margin:0 0 8px;color:#d8cfbf}
.colophon__txt a,.colophon__refs a{color:#f0c89a}
.colophon__spec{font-size:11.5px;color:#a89a86;font-family:var(--n);margin:6px 0 12px}
.colophon__refs{font-size:11.5px;line-height:1.8;color:#b9ad9a;margin:0 0 8px}
.colophon__note{font-size:11px;color:#8f8472;line-height:1.7;margin:6px 0 0}

@media(max-width:560px){.rlab{font-size:10px}.rera{display:none}.room-nav{font-size:12.5px;flex-wrap:wrap}}
@media(prefers-color-scheme:dark){
  body{background:#1a1712;color:#efe7d8}
  .stage{background:#26221b;border-color:#efe7d8}
  .play{background:#1f1b14}
  .rdot{background:#26221b}
  .learn{background:#16241b}
  .closing{background:#221c12}
  .nav button{background:#26221b;color:#efe7d8;border-color:#efe7d8}
  .hero .lede{color:#c9c1b2}
}