/* ── CSS Custom Properties ── */
:root {
  --bg:          #0d0d14;
  --bg-panel:    #13131f;
  --bg-card:     #1a1a2e;
  --bg-hover:    #22223a;
  --border:      #2a2a45;
  --border-hi:   #3a3a60;

  --text:        #c8ccd8;
  --text-dim:    #6a6a8a;
  --text-bright: #e8ecf8;

  --green:       #39d353;
  --green-dim:   #1a6628;
  --yellow:      #f0c040;
  --orange:      #f07830;
  --red:         #e03030;
  --red-dim:     #601010;
  --blue:        #4090e0;
  --purple:      #9060d0;
  --teal:        #30b0c0;

  --font-mono:   'Consolas', 'Courier New', monospace;
  --font-ui:     'Segoe UI', system-ui, sans-serif;

  --radius:      4px;
  --gap:         8px;
}

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

html { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 13px;
  min-width: 1024px;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
#header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 6px 16px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  height: 44px;
}

#header h1 {
  font-size: 14px;
  font-weight: 600;
  color: var(--teal);
  letter-spacing: 0.05em;
  white-space: nowrap;
  margin-right: 8px;
}

.header-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

.header-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-label {
  color: var(--text-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

select {
  background: var(--bg-card);
  color: var(--text-bright);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px 8px;
  font-size: 12px;
  font-family: var(--font-ui);
  cursor: pointer;
  outline: none;
}
select:hover { border-color: var(--border-hi); }
select:focus { border-color: var(--teal); }

/* ── Control panel (bottom, fixed) ── */
#control-panel {
  height: 120px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 1px;
  background: var(--border);
}

/* ── Main layout ── */
#main {
  display: grid;
  grid-template-columns: 1fr 320px;
  grid-template-rows: 1fr;
  flex: 1 1 0;
  min-height: 0;
  gap: 1px;
  background: var(--border);
}

#reactor-view {
  background: var(--bg);
  position: relative;
  overflow: hidden;
  min-height: 0;
}

#reactor-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Right column: instruments + graphs stacked ── */
#right-column {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--border);
  gap: 1px;
}

/* ── Instrumentation panel ── */
#instrument-panel {
  background: var(--bg-panel);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  flex: 1 1 0;
}

.panel-section {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

.panel-section-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

/* ── Gauge grid ── */
.gauge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.gauge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 7px;
}

.gauge-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

.gauge-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--green);
  line-height: 1;
}

.gauge-value.warn  { color: var(--yellow); }
.gauge-value.alarm { color: var(--orange); }
.gauge-value.crit  { color: var(--red); animation: pulse-red 0.8s infinite; }
.gauge-value.info  { color: var(--blue); }
.gauge-value.dim   { color: var(--text-dim); }

.gauge-unit {
  font-size: 10px;
  color: var(--text-dim);
  margin-left: 3px;
}

/* Power bar */
.gauge-bar {
  height: 4px;
  background: var(--bg);
  border-radius: 2px;
  margin-top: 4px;
  overflow: hidden;
}

.gauge-bar-fill {
  height: 100%;
  border-radius: 2px;
  background: var(--green);
  transition: width 0.1s linear, background 0.2s;
}

/* ── Reactivity breakdown tooltip ── */
.rho-breakdown {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 4px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2px 6px;
  align-items: center;
}

.rho-label { color: var(--text-dim); }
.rho-bar { height: 3px; background: var(--border); border-radius: 2px; }
.rho-val { text-align: right; }
.rho-val.pos { color: var(--red); }
.rho-val.neg { color: var(--blue); }

/* ── Alarm strip ── */
#alarm-strip {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 80px;
  overflow-y: auto;
  padding: 4px 10px;
  border-bottom: 1px solid var(--border);
}

.alarm-item {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.alarm-item.warning  { background: #2a1f00; color: var(--yellow); }
.alarm-item.alarm    { background: #2a1000; color: var(--orange); }
.alarm-item.critical { background: var(--red-dim); color: var(--red); animation: pulse-red 1s infinite; }
.alarm-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }

/* ── Event log ── */
#event-log {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
  user-select: text;
  cursor: text;
}

.event-entry {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 4px;
  padding: 2px 10px;
  font-size: 11px;
  border-left: 2px solid transparent;
}

.event-entry.info     { border-color: var(--text-dim); }
.event-entry.warning  { border-color: var(--yellow); }
.event-entry.alarm    { border-color: var(--orange); }
.event-entry.critical { border-color: var(--red); }

.event-time {
  font-family: var(--font-mono);
  color: var(--text-dim);
  font-size: 10px;
  align-self: center;
}

.event-text { color: var(--text); }

/* ── Graph tabs ── */
#graph-panel {
  height: 200px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tab-btn {
  padding: 5px 14px;
  font-size: 11px;
  color: var(--text-dim);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  transition: color 0.15s;
}

.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--teal); border-bottom-color: var(--teal); }

.tab-content { flex: 1; display: none; padding: 4px; }
.tab-content.active { display: block; }

.chart-canvas { width: 100% !important; height: 100% !important; }


.control-section {
  background: var(--bg-panel);
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-section-title {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Rod bank sliders */
.rod-banks {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.rod-bank {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.rod-bank-master .rod-bank-label {
  color: var(--teal);
  font-weight: 600;
}

.rod-bank-master .rod-slider {
  accent-color: var(--teal);
}

.rod-bank-sep {
  width: 1px;
  height: 70px;
  background: var(--border);
  flex-shrink: 0;
  align-self: center;
}

.rod-bank-label {
  font-size: 10px;
  color: var(--text-dim);
}

.rod-slider {
  writing-mode: vertical-lr;
  direction: rtl;
  width: 20px;
  height: 60px;
  accent-color: var(--teal);
  cursor: pointer;
}

.rod-pct {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text);
}

/* Tooltip hint on sliders */
.rod-slider:focus { outline: 1px solid var(--teal); border-radius: 2px; }

/* Pump toggles */
.pump-grid {
  display: flex;
  gap: 6px;
}

.pump-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  border: 1px solid var(--green-dim);
  background: var(--green-dim);
  color: var(--green);
  font-size: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: all 0.15s;
}

.pump-btn.off {
  border-color: var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
}

/* Emergency / sim controls */
.btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text);
  font-size: 12px;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: all 0.15s;
}

.btn:hover { border-color: var(--border-hi); background: var(--bg-hover); }

.btn-scram {
  background: var(--red-dim);
  border-color: var(--red);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
  padding: 10px 18px;
}
.btn-scram:hover { background: var(--red); }

.btn-teal  { border-color: var(--teal); color: var(--teal); }
.btn-teal:hover { background: #0a2a30; }

/* Speed selector */
.speed-group {
  display: flex;
  gap: 3px;
}

.speed-btn {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 11px;
  cursor: pointer;
  font-family: var(--font-mono);
}

.speed-btn.active {
  border-color: var(--teal);
  color: var(--teal);
  background: #0a2030;
}

/* Toggle switch */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--text-dim);
}

.toggle {
  position: relative;
  width: 30px;
  height: 16px;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle input:checked + .toggle-track { background: var(--teal); border-color: var(--teal); }

.toggle-track::after {
  content: '';
  position: absolute;
  left: 2px;
  top: 2px;
  width: 10px;
  height: 10px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(14px);
  background: #fff;
}

/* ── Info sidebar ── */
#info-sidebar {
  position: fixed;
  right: 0;
  top: 44px;
  bottom: 0;
  width: 360px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 100;
  overflow: hidden;
}

#info-sidebar.open { transform: translateX(0); }

.sidebar-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.sidebar-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-bright);
}

.sidebar-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 0 2px;
}
.sidebar-close:hover { color: var(--text); }

.sidebar-body {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  line-height: 1.6;
  font-size: 13px;
  color: var(--text);
}

.sidebar-body h3 {
  font-size: 12px;
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin: 12px 0 6px;
}

.sidebar-body p { margin-bottom: 10px; }

.sidebar-body .highlight {
  background: var(--bg-card);
  border-left: 3px solid var(--teal);
  padding: 6px 10px;
  margin: 8px 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 12px;
}

/* ── ORM indicator (RBMK only) ── */
#orm-display {
  font-family: var(--font-mono);
  font-size: 14px;
}

/* ── Simulation time ── */
#sim-time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--teal);
}

/* ── Overlay toggle buttons ── */
.overlay-btns {
  display: flex;
  gap: 4px;
}

.overlay-btn {
  padding: 3px 8px;
  font-size: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text-dim);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.overlay-btn.active {
  border-color: var(--teal);
  color: var(--teal);
  background: #0a2030;
}

/* ── Info button (? icon next to control labels) ── */
.info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid var(--border-hi);
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 9px;
  font-family: var(--font-ui);
  cursor: pointer;
  vertical-align: middle;
  margin-left: 3px;
  padding: 0;
  line-height: 1;
}
.info-btn:hover { border-color: var(--teal); color: var(--teal); }

/* ── Animations ── */
@keyframes pulse-red {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ── Scrollbar styling ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }