/* แล็บโมเลกุล — 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}

.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}
.knob-box{display:flex;flex-direction:column;gap:8px}

.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:1.05rem;font-weight:700;font-variant-numeric:tabular-nums}

/* เลือกธาตุ */
.el-pick{display:flex;flex-direction:column;gap:5px}
.el-lab{font-size:.72rem;font-weight:700;color:var(--muted)}
.el-row{display:flex;gap:5px;flex-wrap:wrap}
.el-btn{width:38px;height:38px;border-radius:10px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.85rem;font-weight:700;cursor:pointer;color:var(--ink);
  display:grid;place-items:center;position:relative;padding:0}
.el-btn::after{content:'';position:absolute;left:5px;right:5px;bottom:4px;height:3px;border-radius:2px;background:var(--dot,#ccc)}
.el-btn.is-active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-ink)}

/* คลังโมเลกุล */
.mol-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:6px}
.mol-btn{padding:9px 6px;border-radius:10px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;cursor:pointer;color:var(--ink);display:flex;flex-direction:column;gap:2px;align-items:center}
.mol-btn .mb-f{font-size:.9rem;font-weight:700}
.mol-btn .mb-n{font-size:.63rem;color:var(--muted);line-height:1.25;text-align:center}
.mol-btn.is-active{border-color:var(--brand);background:var(--brand-soft)}
.mol-btn.is-seen{border-color:#bfe0c9}

/* การ์ดผลวิเคราะห์ */
.mol-card{background:var(--bg);border-radius:12px;padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.mol-top{display:flex;align-items:baseline;gap:8px}
.mol-formula{font-size:1.15rem;font-weight:700}
.mol-ax{margin-left:auto;font-size:.74rem;font-weight:700;color:var(--brand-ink);background:var(--brand-soft);padding:2px 9px;border-radius:999px}
.mol-shape{font-size:.84rem;font-weight:600;color:var(--muted)}
.pol-tag{font-size:.76rem;font-weight:700;padding:6px 10px;border-radius:9px;text-align:center}
.pol-tag.polar{background:#fdf3f2;color:#8f2018;border:1px solid #f6cdc9}
.pol-tag.nonpolar{background:#f0fbf7;color:#0a6b50;border:1px solid #bfe9da}
.bond-list{display:flex;flex-direction:column;gap:3px}
.bd-row{display:flex;align-items:center;gap:7px;font-size:.72rem;color:var(--muted)}
.bd-name{font-weight:700;color:var(--ink);width:56px;flex:none}
.bd-type{margin-left:auto;padding:1px 8px;border-radius:999px;font-weight:700;font-size:.66rem}
.bd-type.nonpolar_covalent{background:#eef0f2;color:#4b5058}
.bd-type.polar_covalent{background:#fff3e0;color:#8a5300}
.bd-type.ionic{background:#f3e8fb;color:#61338a}

/* ควิซ */
.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:.95rem;line-height:1.5;font-weight:700}
.q-row{display:flex;gap:6px;flex-wrap:wrap}
.q-opt{flex:1 1 45%;min-width:110px;padding:9px 6px;border-radius:9px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.78rem;font-weight:700;cursor:pointer;color:var(--ink)}
.q-opt:hover{border-color:var(--brand)}
.q-opt.is-right{border-color:var(--ok);background:#e9f8f2;color:#0a6b50}
.q-opt.is-wrong{border-color:var(--danger);background:#fdf3f2;color:#8f2018}
.q-feed{font-size:.76rem;font-weight:600;min-height:1em}
.q-feed.ok{color:#0a6b50}
.q-feed.bad{color:#8f2018}

.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-submit{background:var(--ok);color:#fff;width:100%}

@media (min-width:900px){
  body{flex-direction:row}
  #panel{width:360px;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:44vh}
  #webgl-canvas{flex:1;min-height:180px}
}

/* เฉพาะ survey-lab */
.plot-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:6px}
.plot-btn{padding:8px 6px;border-radius:10px;border:1.5px solid var(--line);background:#fff;
  font-family:inherit;font-size:.75rem;font-weight:600;cursor:pointer;color:var(--ink);line-height:1.3}
.plot-btn.is-active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-ink)}
.chk{display:flex;align-items:center;gap:7px;font-size:.76rem;color:var(--muted);cursor:pointer}
.chk input{width:15px;height:15px;accent-color:var(--brand)}
.ctl-row{display:flex;gap:8px}
.ctl-row .btn{flex:1}

.tbl-wrap{max-height:190px;overflow:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
.tbl{width:100%;border-collapse:collapse;font-size:.72rem;font-variant-numeric:tabular-nums}
.tbl th{position:sticky;top:0;background:var(--bg);color:var(--muted);font-weight:700;
  padding:6px 7px;text-align:right;white-space:nowrap;border-bottom:1px solid var(--line);z-index:1}
.tbl th:first-child,.tbl td:first-child{text-align:left}
.tbl td{padding:5px 7px;text-align:right;border-bottom:1px solid #f1efe9;white-space:nowrap}
.tbl tr:last-child td{border-bottom:none}
.tbl tr.is-sum td{font-weight:700;background:var(--bg)}
.tbl td.adj{color:#0a6b50}
.tbl td.corr{color:#8a5300}

.closure{background:var(--bg);border-radius:12px;padding:9px 12px;display:flex;flex-direction:column;gap:4px;font-size:.75rem}
.cl-row{display:flex;gap:8px;align-items:baseline}
.cl-k{color:var(--muted);flex:none;width:132px}
.cl-v{font-weight:700;font-variant-numeric:tabular-nums}
.cl-v.good{color:#0a6b50}
.cl-v.bad{color:var(--danger)}

.area-box{background:#eef7f2;border:1px solid #bfe9da;border-radius:12px;padding:10px 12px;
  display:flex;flex-direction:column;gap:3px}
.area-sqm{font-size:.74rem;color:var(--muted);font-variant-numeric:tabular-nums}
.area-rai{font-size:1.05rem;font-weight:700;color:#0a6b50}

/* ---------- ช่องมองภาพกล้องระดับ ---------- */
#scope {
  position: absolute; right: 16px; bottom: 16px; z-index: 5;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.scope-tube {
  position: relative; width: 220px; height: 220px; border-radius: 50%; overflow: hidden;
  background: #0d1116; box-shadow: 0 0 0 7px #23282f, 0 0 0 9px #454c55, 0 10px 26px rgba(0,0,0,.4);
}
.scope-tube canvas { width: 100%; height: 100%; display: block; }
.reticle { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.reticle line { stroke: #14181d; stroke-width: .5; }
.reticle line.stadia { stroke-width: .35; stroke-dasharray: 2 2; }
.scope-foot {
  display: flex; gap: 10px; align-items: baseline;
  background: rgba(20,24,29,.86); color: #eef2f6; padding: 4px 12px; border-radius: 999px;
  font-size: .82rem; letter-spacing: .02em;
}
.scope-foot #scope-read { font-weight: 700; }
@media (max-width: 720px) { .scope-tube { width: 150px; height: 150px; } }

/* ---------- เครื่องมือวัด · วาดแปลงเอง ---------- */
.inst-row{display:flex;flex-wrap:wrap;gap:5px}
.inst-btn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:3px 10px;
  font-size:.72rem;font-family:inherit;cursor:pointer;color:var(--ink)}
.inst-btn:hover{border-color:var(--brand)}
.inst-btn.on{border-color:var(--brand);background:var(--brand);color:#fff;font-weight:600}
.draw-box{display:flex;flex-direction:column;gap:7px;border:1px solid var(--line);
  border-radius:12px;padding:9px 11px;background:var(--bg)}
.box-head{display:flex;align-items:center;gap:8px;font-size:.78rem;font-weight:600;color:var(--muted)}
.mini-btn{margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:999px;
  padding:2px 11px;font-size:.7rem;font-family:inherit;cursor:pointer;color:var(--muted)}
.mini-btn.on{border-color:var(--brand);background:var(--brand);color:#fff;font-weight:600}
#draw-body{display:flex;flex-direction:column;gap:7px}
#draw-body[hidden]{display:none}
.corner-list{display:flex;flex-wrap:wrap;gap:4px;font-family:ui-monospace,monospace;font-size:.7rem}
.cn-chip{border:1px solid var(--line);border-radius:8px;padding:2px 7px;background:#fff}
.btn-sm{padding:5px 11px;font-size:.73rem;box-shadow:none}