/* แล็บช่างไฟฟ้า — เวทีบน / แผงล่าง (จอกว้าง: ซ้าย-ขวา) */
:root{
  --sans:'IBM Plex Sans Thai','Noto Sans Thai',system-ui,-apple-system,'Segoe UI',sans-serif;
  --ink:#191a24; --muted:#6b6c7e; --line:#e6e3dc; --surface:#fff; --bg:#f5f4ef;
  --brand:#2e7d88; --brand-ink:#1f5f68; --brand-soft:#dcecee;
  --ok:#129a72; --warn:#d68a17; --danger:#e2564a;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);display:flex;flex-direction:column;
  -webkit-font-smoothing:antialiased;user-select:none;-webkit-user-select:none}
input,textarea,select,[contenteditable]{-webkit-user-select:text;user-select:text}

#stage{position:relative;flex:1;min-height:0;background:#f2f0ea}
#webgl-canvas{width:100%;height:100%;display:block;touch-action:none}

.status{
  position:absolute;left:12px;top:12px;
  background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:12px;
  padding:8px 13px;font-size:.82rem;box-shadow:0 4px 14px rgba(25,26,36,.12);
  pointer-events:none;max-width:min(560px,calc(100% - 120px));line-height:1.5;
}
.status.ok{border-color:#bfe9da;color:#0a6b50;background:#f0fbf7}
.status.bad{border-color:#f6cdc9;color:#8f2018;background:#fdf3f2}
.status.warn{border-color:#f7e2bd;color:#7d5209;background:#fffaf0}

#panel{
  flex:none;background:var(--surface);border-top:1px solid var(--line);
  padding:12px 14px 14px;display:flex;flex-direction:column;gap:11px;max-height:54vh;overflow-y:auto;
}
.panel-head{display:flex;align-items:baseline;gap:10px}
.panel-title{font-weight:700;font-size:.92rem}
.goal{font-size:.78rem;color:var(--muted);margin-left:auto;text-align:right}
.hint{font-size:.76rem;color:var(--muted);line-height:1.55;margin:0}

.stat-row{display:flex;gap:8px}
.stat{flex:1;background:var(--bg);border-radius:12px;padding:8px 11px;display:flex;flex-direction:column;gap:2px}
.stat-k{font-size:.7rem;font-weight:700;color:var(--muted)}
.stat-v{font-size:1.15rem;font-weight:700;font-variant-numeric:tabular-nums}

.ctl-row{display:flex;gap:8px}
.ctl-row .btn{flex:1}

  font-family:inherit;font-size:.8rem;font-weight:700;cursor:pointer;color:var(--ink);font-variant-numeric:tabular-nums}

  font-family:inherit;font-size:.78rem;font-weight:600;cursor:pointer;color:var(--ink)}

.tasks{display:flex;flex-direction:column;gap:5px}
.tk-head{font-size:.78rem;font-weight:600;color:var(--muted)}
.tk-head span:last-child{background:var(--brand-soft);color:var(--brand-ink);padding:1px 8px;border-radius:999px;font-size:.72rem}
.task-list{display:flex;flex-direction:column;gap:4px}
.task-item{display:flex;align-items:center;gap:7px;font-size:.78rem;padding:6px 9px;border-radius:8px;background:var(--bg)}
.task-item.is-done{background:#e9f8f2;color:#0a6b50}
.task-check{width:16px;height:16px;border-radius:50%;border:2px solid var(--line);flex:none;display:grid;place-items:center;font-size:.6rem;color:#fff}
.task-item.is-done .task-check{background:var(--ok);border-color:var(--ok)}

.actions{display:flex;gap:8px}
.btn{padding:10px 14px;border-radius:999px;border:1px solid transparent;font-family:inherit;
  font-size:.84rem;font-weight:600;cursor:pointer;box-shadow:0 2px 6px rgba(25,26,36,.12)}
.btn:active{transform:translateY(1px)}
.btn[disabled]{opacity:.45;pointer-events:none}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn-run{background:var(--brand);color:#fff}
.btn-run.is-on{background:var(--danger)}
.btn-submit{background:var(--ok);color:#fff;width:100%}

@media (min-width:900px){
  body{flex-direction:row}
  #panel{width:348px;max-height:none;height:100%;border-top:none;border-left:1px solid var(--line);padding:16px}
}
@media (max-width:560px){
  .status{position:static;margin:8px 12px;max-width:none}
  #stage{display:flex;flex-direction:column;min-height:46vh}
  #webgl-canvas{flex:1;min-height:180px}
}

/* เฉพาะ trig-lab */
.mode-row{display:flex;gap:6px}
.mode-btn{flex:1;padding:8px 4px;border-radius:9px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.8rem;font-weight:600;cursor:pointer;color:var(--ink)}
.mode-btn.is-active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-ink)}
.ctl-col{display:flex;flex-direction:column;gap:9px}
.ctl-col[hidden]{display:none}
.quiz{background:var(--bg);border-radius:12px;padding:10px 12px;display:flex;flex-direction:column;gap:7px}
.q-head{font-size:.74rem;font-weight:700;color:var(--muted)}
.q-text{font-size:.9rem;line-height:1.5;font-weight:700}
.q-row{display:flex;gap:6px;flex-wrap:wrap}
.q-opt{flex:1;min-width:64px;padding:8px 4px;border-radius:9px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.88rem;font-weight:700;cursor:pointer;color:var(--ink)}
.q-opt:hover{border-color:var(--brand)}
.q-feed{font-size:.76rem;font-weight:600}
.q-feed.ok{color:#0a6b50}
.q-feed.bad{color:#8f2018}
.stat-v.sin{color:#c23b2b}
.stat-v.cos{color:#2456a8}

/* กราฟเส้นโค้ง (SVG) — ใช้ร่วมหลายแล็บ */
.curve{width:100%;height:auto;border-radius:12px;border:1px solid var(--line);background:var(--bg)}

/* เฉพาะ electric-lab */
.main-box{display:flex;align-items:center;gap:10px;background:var(--bg);border-radius:12px;padding:9px 12px}
.main-lab{font-size:.86rem;font-weight:700;font-variant-numeric:tabular-nums}
.main-lab.off{color:var(--danger)}
.cir-list{display:flex;flex-direction:column;gap:8px}
.cir-row{background:var(--bg);border-radius:12px;padding:8px 10px;display:flex;flex-direction:column;gap:6px}
.cir-head{display:flex;align-items:baseline;gap:8px}
.cir-name{font-size:.8rem;font-weight:700}
.cir-br{margin-left:auto;font-size:.72rem;color:var(--muted);font-variant-numeric:tabular-nums}
.cir-ctl{display:flex;gap:4px;flex-wrap:wrap;align-items:center}
.w-btn{width:40px;padding:6px 0;border-radius:8px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.76rem;font-weight:700;cursor:pointer;color:var(--ink)}
.w-btn.is-active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-ink)}
.g-btn{padding:6px 10px;border-radius:8px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.76rem;font-weight:700;cursor:pointer;color:var(--ink)}
.g-btn.is-active{border-color:#2c8f4e;background:#e7f6ec;color:#1c6e39}
.c-btn{padding:6px 12px;border-radius:8px;border:none;background:var(--brand);color:#fff;
  font-family:inherit;font-size:.76rem;font-weight:700;cursor:pointer}
.sw-btn{padding:6px 12px;border-radius:8px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.76rem;font-weight:700;cursor:pointer;color:var(--muted);margin-left:auto}
.sw-btn.is-on{border-color:#2c8f4e;background:#2c8f4e;color:#fff}
.sw-btn[disabled]{opacity:.4}
.q-opt.is-active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-ink)}