/* ═══════════════════════════════════════════════════════════════════════════
   Elevator Scheduling Simulator — Stylesheet
   ═══════════════════════════════════════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #080818;
  --bg2: #0d0d22;
  --bg3: #12122e;
  --bg-building: linear-gradient(180deg, #0e0e28 0%, #0a0a1e 100%);
  --bg-header: linear-gradient(90deg, #0d0d30 0%, #120d28 100%);
  --panel: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.08);
  --text: #e2e2f0;
  --text-dim: #7070a0;
  --accent: #4fc3f7;
  --accent2: #7c4dff;
  --green: #00e676;
  --red: #ff5252;
  --yellow: #ffea00;
  --orange: #ff9100;
  --floor-h: 28px;
  --shaft-w: 62px;
  --car-w: 50px;
  --car-h: 22px;
  --radius: 6px;
  --scrollbar-bg: transparent;
  --scrollbar-thumb: rgba(255,255,255,0.15);
}

[data-theme="light"] {
  --bg: #f4f5fb;
  --bg2: #eceef8;
  --bg3: #e2e5f5;
  --bg-building: linear-gradient(180deg, #e8eaf6 0%, #dde1f0 100%);
  --bg-header: linear-gradient(90deg, #e8eaf6 0%, #dde1f0 100%);
  --panel: rgba(0,0,0,0.04);
  --border: rgba(0,0,0,0.10);
  --text: #1a1a2e;
  --text-dim: #5050a0;
  --accent: #0277bd;
  --accent2: #6200ea;
  --green: #1b8a3a;
  --red: #c62828;
  --yellow: #f57f17;
  --orange: #e65100;
  --scrollbar-thumb: rgba(0,0,0,0.15);
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'Noto Sans SC', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
}

/* ─── Scrollbar ──────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: var(--scrollbar-bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 2px; }

/* ─── App Layout ─────────────────────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ─── Header ─────────────────────────────────────────────────────────────── */
#app-header {
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  padding: 4px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  flex-shrink: 0;
  min-height: 38px;
}
.hdr-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 4px;
}
.hdr-sep { width: 1px; height: 22px; background: var(--border); flex-shrink: 0; }
.hdr-label { font-size: 11px; color: var(--text-dim); white-space: nowrap; }
.hdr-group { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.spacer { flex: 1; }

/* ─── Inputs ─────────────────────────────────────────────────────────────── */
select, input[type=number] {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px;
  padding: 2px 5px;
  font-size: 12px;
  font-family: inherit;
}
select:focus, input:focus { outline: 1px solid var(--accent); }
input[type=number] { width: 44px; text-align: center; }
input[type=range] { accent-color: var(--accent); width: 64px; cursor: pointer; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px;
  padding: 3px 9px;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  transition: background .15s, border-color .15s;
  white-space: nowrap;
}
.btn:hover { background: var(--panel); border-color: var(--accent); }
.btn:disabled { opacity: .4; cursor: default; }
.btn-accent { background: var(--accent); color: #000; border-color: var(--accent); }
.btn-accent:hover { opacity: .9; }
.btn-green { background: var(--green); color: #000; border-color: var(--green); }
.btn-green:hover { opacity: .9; }
.btn-warn { background: var(--orange); color: #000; border-color: var(--orange); }
.btn-warn:hover { opacity: .9; }
.btn-sm { padding: 2px 6px; font-size: 11px; }
.btn.active { background: var(--accent2); border-color: var(--accent2); color: #fff; }
.btn-icon { padding: 2px 6px; font-size: 14px; line-height: 1; }

/* ─── Status Chip ────────────────────────────────────────────────────────── */
#status-chip {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
}
#status-chip.running { border-color: var(--green); color: var(--green); }
#status-chip.paused { border-color: var(--yellow); color: var(--yellow); }
#tick-display { font-size: 11px; color: var(--text-dim); white-space: nowrap; }

/* ─── Body Layout ────────────────────────────────────────────────────────── */
#app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0; /* critical for flex children */
}

/* ─── Sidebar ────────────────────────────────────────────────────────────── */
#sidebar {
  width: 260px;
  min-width: 220px;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}
#tab-bar {
  display: flex;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.tab-btn {
  flex: 1;
  padding: 7px 4px;
  font-size: 14px;
  text-align: center;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-dim);
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
  font-family: inherit;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

#tab-content {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  min-height: 0;
  font-size: 12px;
}

/* ─── Main Area ──────────────────────────────────────────────────────────── */
#main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
  min-width: 0;
}

/* ─── Building ───────────────────────────────────────────────────────────── */
#building-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 6px 10px;
  min-height: 0;
}
#building {
  background: var(--bg-building);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  min-width: max-content;
  position: relative;
}
.building-inner {
  display: flex;
  flex-direction: column-reverse;
}

/* ─── Floor Rows ─────────────────────────────────────────────────────────── */
.floor-row {
  display: flex;
  align-items: center;
  height: var(--floor-h);
  border-top: 1px solid var(--border);
  position: relative;
}
.floor-row:first-child { border-top: none; }
.floor-label {
  width: 30px;
  text-align: right;
  padding-right: 4px;
  font-size: 10px;
  color: var(--text-dim);
  flex-shrink: 0;
}
.floor-call-btns {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 0 1px;
  justify-content: center;
  flex-shrink: 0;
}
.call-btn {
  font-size: 8px;
  width: 14px;
  height: 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 2px;
  cursor: pointer;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .1s;
  padding: 0;
  font-family: inherit;
}
.call-btn:hover { background: var(--accent); color: #000; border-color: var(--accent); }
.call-btn.active { background: var(--accent); color: #000; border-color: var(--accent); }
.floor-waiting {
  width: 40px;
  font-size: 8px;
  color: var(--yellow);
  text-align: center;
  font-weight: 700;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  line-height: 1.1;
}
.floor-wait-up { color: var(--green); }
.floor-wait-dn { color: var(--orange); }

/* ─── Shaft Cells ────────────────────────────────────────────────────────── */
.shaft-header {
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
  flex-direction: column;
  gap: 0;
  line-height: 1;
}
.shaft-zone-label { font-size: 8px; color: var(--accent2); font-weight: 600; }
.shaft-floor {
  height: var(--floor-h);
  border-top: 1px solid rgba(255,255,255,.03);
  position: relative;
}

/* ─── Elevator Car ───────────────────────────────────────────────────────── */
.elev-car {
  width: var(--car-w);
  height: var(--car-h);
  border-radius: 3px;
  border: 2px solid currentColor;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  pointer-events: none;
  transition: bottom 0s linear;
  background: rgba(0,0,0,0.4);
  z-index: 10;
}
[data-theme="light"] .elev-car { background: rgba(255,255,255,0.5); }
.elev-car-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  width: 100%;
  line-height: 1;
}
.elev-car-id { font-size: 8px; font-weight: 700; }
.elev-car-pax { font-size: 7px; opacity: .8; }
.door-overlay {
  position: absolute;
  top: 0;
  height: 100%;
  background: currentColor;
  opacity: 0.3;
  pointer-events: none;
  transition: width .05s;
}
.door-left { left: 0; }
.door-right { right: 0; }

/* ─── Performance Chart ──────────────────────────────────────────────────── */
#chart-area {
  height: 60px;
  border-top: 1px solid var(--border);
  padding: 4px 8px;
  background: var(--bg2);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
#perf-canvas {
  flex: 1;
  height: 50px;
  background: var(--bg3);
  border-radius: 3px;
}
.chart-legend { display: flex; flex-direction: column; gap: 2px; font-size: 9px; color: var(--text-dim); }
.chart-legend-item { display: flex; align-items: center; gap: 3px; }
.legend-dot { width: 6px; height: 6px; border-radius: 50%; }

/* ─── Stat Grid ──────────────────────────────────────────────────────────── */
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.stat-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 6px;
  text-align: center;
}
.stat-item.green { border-color: rgba(0,230,118,.3); background: rgba(0,230,118,.06); }
.stat-item.yellow { border-color: rgba(255,234,0,.3); background: rgba(255,234,0,.06); }
.stat-item.orange { border-color: rgba(255,145,0,.3); background: rgba(255,145,0,.06); }
.stat-item.red { border-color: rgba(255,82,82,.3); background: rgba(255,82,82,.06); }
.stat-value { font-size: 16px; font-weight: 700; color: var(--accent); line-height: 1.2; }
.stat-item.green .stat-value { color: var(--green); }
.stat-item.yellow .stat-value { color: var(--yellow); }
.stat-item.orange .stat-value { color: var(--orange); }
.stat-item.red .stat-value { color: var(--red); }
.stat-label { font-size: 10px; color: var(--text-dim); margin-top: 2px; }

/* ─── Elevator Status Panel ──────────────────────────────────────────────── */
.elev-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px;
  margin-bottom: 4px;
}
.elev-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 3px; }
.elev-name { font-weight: 700; font-size: 11px; }
.elev-state-badge {
  font-size: 9px; padding: 1px 5px; border-radius: 8px;
  background: var(--bg3); border: 1px solid var(--border);
}
.elev-state-badge.moving { border-color: var(--accent); color: var(--accent); }
.elev-state-badge.open { border-color: var(--green); color: var(--green); }
.elev-state-badge.opening, .elev-state-badge.closing { border-color: var(--yellow); color: var(--yellow); }
.elev-row { display: flex; justify-content: space-between; font-size: 10px; color: var(--text-dim); }
.pax-dots { display: flex; gap: 2px; flex-wrap: wrap; margin-top: 2px; }
.pax-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); opacity: .7; }

/* ─── Control Panel ──────────────────────────────────────────────────────── */
.ctrl-section { margin-bottom: 8px; }
.ctrl-title { font-size: 11px; color: var(--text-dim); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .5px; }
.ctrl-row { display: flex; align-items: center; gap: 4px; margin-bottom: 3px; flex-wrap: wrap; }
.preset-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3px; }

/* ─── Log Panel ──────────────────────────────────────────────────────────── */
#log-list { display: flex; flex-direction: column; gap: 2px; }
.log-entry {
  font-size: 9px; padding: 2px 4px; border-radius: 3px;
  background: var(--panel); border-left: 2px solid var(--border);
  word-break: break-all; line-height: 1.3;
}
.log-entry.info { border-color: var(--accent); }
.log-entry.warn { border-color: var(--yellow); color: var(--yellow); }
.log-entry.error { border-color: var(--red); color: var(--red); }
.log-entry.success { border-color: var(--green); color: var(--green); }

/* ─── Algorithm Panel ────────────────────────────────────────────────────── */
.algo-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  margin-bottom: 6px;
}
.algo-card h3 { font-size: 12px; color: var(--accent); margin-bottom: 4px; }
.algo-prop { margin-bottom: 4px; font-size: 10px; line-height: 1.4; }
.algo-prop strong {
  color: var(--text-dim); display: block; font-size: 9px;
  text-transform: uppercase; letter-spacing: .4px; margin-bottom: 1px;
}

/* ─── A/B Panel ──────────────────────────────────────────────────────────── */
.ab-table { width: 100%; border-collapse: collapse; font-size: 10px; margin-top: 4px; }
.ab-table th {
  text-align: left; padding: 3px 5px; background: var(--bg3);
  border: 1px solid var(--border); color: var(--text-dim); font-size: 9px;
}
.ab-table td { padding: 3px 5px; border: 1px solid var(--border); }
.ab-table td.better { color: var(--green); font-weight: 700; }
.ab-table td.worse { color: var(--red); }
.ab-header { display: flex; align-items: center; gap: 5px; margin-bottom: 6px; flex-wrap: wrap; }

/* ─── Misc ───────────────────────────────────────────────────────────────── */
.section-title {
  font-size: 10px; color: var(--text-dim); margin-bottom: 5px;
  text-transform: uppercase; letter-spacing: .5px; padding-bottom: 3px;
  border-bottom: 1px solid var(--border);
}
.tag {
  display: inline-block; font-size: 9px; padding: 1px 5px; border-radius: 8px;
  background: var(--bg3); border: 1px solid var(--border); color: var(--text-dim);
}