:root {
  --bg-color: #080c14;
  --card-bg: #111827;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #059669;
  --danger: #dc2626;
  --warning: #f59e0b;
  --border: #1f2937;
}
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
}
.container { width: 100%; max-width: 950px; }
header { text-align: center; margin-bottom: 1.5rem; }
header h1 { font-size: 1.5rem; margin: 0 0 0.3rem 0; color: var(--accent); }
header p { color: var(--text-muted); margin: 0; font-size: 0.9rem; }
.dashboard-top { display: grid; grid-template-columns: 2fr 1.5fr 1fr; gap: 12px; margin-bottom: 20px; }
.metric-box { background: var(--card-bg); border: 1px solid var(--border); padding: 12px 16px; border-radius: 8px; text-align: center; }
.metric-box span { display: block; font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.metric-box strong { font-size: 1.1rem; }
.atp-container { background: #030712; border-radius: 4px; height: 8px; width: 100%; margin-top: 6px; overflow: hidden; border: 1px solid var(--border); }
.atp-bar { height: 100%; background: var(--success); width: 100%; transition: width 0.3s; }
.setup-bar { background-color: var(--card-bg); border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin-bottom: 20px; display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 12px; align-items: end; }
.setup-group label { display: block; font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
select, input[type="number"] { width: 100%; background: #030712; color: var(--text-main); border: 1px solid var(--border); padding: 8px; border-radius: 6px; font-size: 0.85rem; }
.btn-start { background-color: var(--success); color: white; border: none; padding: 9px 16px; font-weight: bold; border-radius: 6px; cursor: pointer; transition: background 0.2s; height: 36px; }
.btn-start:hover { background-color: #047857; }
.card { background-color: var(--card-bg); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 20px; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3); }
h2 { font-size: 1.1rem; margin-top: 0; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.padlock-status { font-size: 0.75rem; padding: 4px 10px; border-radius: 4px; font-weight: bold; text-transform: uppercase; }
.locked { background: var(--danger); color: white; }
.unlocked { background: var(--success); color: white; }
.instruction-box { background: #1a2234; border-left: 3px solid var(--accent); padding: 12px 16px; font-size: 0.85rem; color: #d1d5db; margin-bottom: 15px; border-radius: 0 6px 6px 0; line-height: 1.5; }
.timer-display { background: rgba(239, 68, 68, 0.1); border: 1px solid var(--danger); color: #fca5a5; padding: 6px 12px; border-radius: 6px; font-weight: bold; font-family: monospace; text-align: center; margin-bottom: 15px; }
.control-group { margin-bottom: 14px; }
label { display: block; font-size: 0.85rem; margin-bottom: 5px; color: var(--text-muted); }
input[type="range"] { width: 100%; background: #030712; color: var(--text-main); border: 1px solid var(--border); padding: 8px; border-radius: 6px; accent-color: var(--accent); }
canvas { width: 100%; height: 140px; background: #030712; border-radius: 6px; border: 1px solid var(--border); margin-top: 10px; }
.btn-action { background-color: var(--accent); color: white; border: none; padding: 10px 16px; font-weight: bold; border-radius: 6px; cursor: pointer; width: 100%; margin-top: 12px; transition: background 0.2s; }
.btn-action:hover { background-color: var(--accent-hover); }
.btn-action:disabled { background: var(--border); color: var(--text-muted); cursor: not-allowed; }
.hidden { display: none; }
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(3, 7, 18, 0.8); display: flex; justify-content: center; align-items: center; z-index: 1000; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal-box { background: var(--card-bg); border: 2px solid var(--border); padding: 30px; border-radius: 14px; text-align: center; max-width: 480px; width: 90%; box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5); transform: scale(0.9); transition: transform 0.3s ease; }
.modal-overlay.active .modal-box { transform: scale(1); }
.modal-box.success { border-color: var(--success); }
.modal-box.failure { border-color: var(--danger); }
.modal-icon { font-size: 3.5rem; margin-bottom: 12px; }
.modal-title { font-size: 1.3rem; font-weight: bold; margin-bottom: 10px; }
.modal-text { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 20px; line-height: 1.5; }
@media (max-width: 720px) {
  .setup-bar { grid-template-columns: 1fr; }
  .dashboard-top { grid-template-columns: 1fr; }
}