:root {
  --bg: #0b1220;
  --panel: #101a30;
  --panel-2: #16223c;
  --border: #25355a;
  --text: #e2e8f0;
  --muted: #8ea0bd;
  --primary: #2563eb;   /* MMG_Agentic primary */
  --secondary: #1e40af; /* MMG_Agentic secondary */
  --accent: #f59e0b;    /* MMG_Agentic accent */
  --success: #22c55e;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

#app {
  display: grid;
  grid-template-columns: 270px 1fr 370px;
  height: 100vh;
}

/* ---------- Sidebar ---------- */
#sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  gap: 16px;
}
#lang-switch { display: flex; gap: 6px; justify-content: flex-end; margin-bottom: 10px; }
.lang-btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font: inherit;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 9px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.lang-btn:hover { border-color: var(--primary); }
.lang-btn.active { color: #fff; border-color: var(--primary); background: rgba(37, 99, 235, 0.25); }

#sidebar h1 { font-size: 1.15rem; margin: 0 0 4px; color: #fff; }
#sidebar .tagline { font-size: 0.8rem; color: var(--muted); margin: 0; }
#sidebar footer { margin-top: auto; font-size: 0.7rem; color: var(--muted); }

#level-list { display: flex; flex-direction: column; gap: 8px; }
.level-item {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  font: inherit; font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.level-item:hover:not(:disabled) { border-color: var(--primary); }
.level-item.active { border-color: var(--primary); background: rgba(37, 99, 235, 0.15); }
.level-item:disabled { opacity: 0.45; cursor: default; }
.lv-num {
  flex: none;
  width: 24px; height: 24px;
  display: grid; place-items: center;
  background: var(--secondary);
  border-radius: 50%;
  font-size: 0.75rem; font-weight: 700; color: #fff;
}
.lv-title { flex: 1; }
.lv-status { flex: none; font-size: 0.8rem; }

/* ---------- Stage ---------- */
#stage { position: relative; min-width: 0; }
#canvas-host { position: absolute; inset: 0; }
#canvas-host canvas { display: block; }

/* ---------- Panel ---------- */
#panel {
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 18px 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
#level-info h2 { font-size: 1rem; margin: 0 0 10px; color: #fff; }
#level-info p { font-size: 0.85rem; line-height: 1.55; color: var(--text); margin: 0 0 10px; }
#level-info .formula { text-align: center; margin: 12px 0; font-size: 1.05rem; }
.tag-a { color: #93c5fd; font-weight: 700; }
.tag-b { color: #fcd34d; font-weight: 700; }

#level-controls { display: flex; flex-direction: column; gap: 12px; }
.ctl-slider label {
  display: flex; justify-content: space-between;
  font-size: 0.8rem; color: var(--muted); margin-bottom: 4px;
}
.ctl-value { color: var(--text); font-variant-numeric: tabular-nums; }
.ctl-slider input[type="range"] { width: 100%; accent-color: var(--primary); }

.ctl-caption { font-size: 0.78rem; color: var(--muted); }
.btn-row { display: flex; gap: 8px; }
.btn {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 7px 0;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.btn:hover { border-color: var(--primary); }
.btn.active { border-color: var(--primary); background: rgba(37, 99, 235, 0.2); }

.readout {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  text-align: center;
  font-size: 1rem;
  min-height: 52px;
}

#mission {
  border: 1px solid var(--accent);
  background: rgba(245, 158, 11, 0.07);
  border-radius: 12px;
  padding: 12px 14px;
}
#mission:empty { display: none; }
#mission h3 { margin: 0 0 8px; font-size: 0.9rem; color: var(--accent); }
#mission p { font-size: 0.83rem; line-height: 1.5; margin: 0 0 8px; }
#mission .hint { color: var(--muted); font-size: 0.78rem; }
#mission.done { border-color: var(--success); background: rgba(34, 197, 94, 0.08); }
#mission.done h3 { color: var(--success); }
.mission-success { color: var(--success); font-weight: 700; }
.mission-unlock { color: var(--text); }

@media (max-width: 1100px) {
  #app { grid-template-columns: 220px 1fr; grid-template-rows: 1fr auto; }
  #panel {
    grid-column: 1 / -1;
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 40vh;
  }
}