:root {
  --bg-0: #070c14;
  --bg-1: #14243a;
  --panel: rgba(12, 20, 32, 0.94);
  --panel-elev: rgba(18, 30, 46, 0.9);
  --panel-ink: #e6eef8;
  --panel-muted: #8da0b7;
  --panel-border: rgba(255, 255, 255, 0.1);
  --panel-control: rgba(24, 38, 57, 0.9);
  --panel-control-border: rgba(171, 201, 229, 0.24);
  --panel-glow: rgba(0, 181, 212, 0.35);
  --accent: #00a8bd;
  --accent-soft: rgba(0, 168, 189, 0.24);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: "Avenir Next", "SF Pro Display", "Segoe UI", sans-serif;
  background: radial-gradient(circle at 18% 6%, #2f476e 0%, var(--bg-0) 46%, #05080f 100%);
}

.layout {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) 74px;
  height: 100%;
  gap: 10px;
  padding: 10px;
}

.panel {
  position: relative;
  background: linear-gradient(180deg, rgba(22, 33, 49, 0.94), var(--panel));
  color: var(--panel-ink);
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.35);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at 10% 0%, rgba(109, 151, 206, 0.16), transparent 50%);
  pointer-events: none;
}

.panel > * {
  position: relative;
  z-index: 1;
}

.left-rail,
.right-rail {
  padding: 8px 6px;
}

.left-rail {
  display: grid;
  grid-auto-rows: min-content;
  gap: 8px;
  align-content: start;
  overflow: visible;
}

.right-rail {
  display: grid;
  align-content: start;
  overflow: visible;
}

.brand {
  margin: 0;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--panel-control-border);
  background: var(--panel-control);
  display: grid;
  place-items: center;
  color: #f0f6ff;
  letter-spacing: 0.06em;
  font-size: 0.74rem;
  font-weight: 700;
}

.rail-action {
  width: 42px;
  height: 42px;
  padding: 0;
  display: grid;
  place-items: center;
  font-size: 0.9rem;
}

h2 {
  margin: 0;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--panel-muted);
}

.controls {
  width: 100%;
  padding: 8px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--panel-elev);
  display: grid;
  gap: 8px;
}

.controls-icons {
  gap: 6px;
  padding: 6px;
}

.left-rail > .controls.controls-icons > h2 {
  display: none;
}

label {
  display: grid;
  gap: 4px;
  font-size: 0.76rem;
  color: var(--panel-muted);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--panel-ink);
  font-size: 0.82rem;
}

input[type="checkbox"] {
  margin: 0;
  accent-color: var(--accent);
}

select,
input[type="number"],
input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

select,
input[type="number"] {
  border: 1px solid var(--panel-control-border);
  background: var(--panel-control);
  color: var(--panel-ink);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 0.84rem;
}

input[type="number"] {
  appearance: textfield;
}

input[type="range"] {
  height: 20px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

#tool-buttons,
#speed-buttons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.compact-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

button {
  border: 1px solid var(--panel-control-border);
  border-radius: 12px;
  background: var(--panel-control);
  color: var(--panel-ink);
  padding: 6px 8px;
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease, color 0.18s ease;
}

button:hover {
  border-color: rgba(190, 218, 246, 0.35);
  transform: translateY(-1px);
}

button:focus-visible {
  outline: 2px solid var(--panel-glow);
  outline-offset: 1px;
}

button.active {
  border-color: rgba(99, 228, 246, 0.48);
  background: linear-gradient(180deg, rgba(0, 168, 189, 0.38), var(--accent-soft));
  color: #f3fbff;
}

.tool-btn,
.speed-btn,
.icon-btn,
.inline-toggle {
  min-height: 40px;
  width: 100%;
  display: grid;
  place-items: center;
  padding: 0;
}

.tool-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tool-btn svg circle {
  fill: currentColor;
  stroke: none;
}

.speed-btn {
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  font-weight: 650;
}

.icon-btn,
.inline-toggle {
  border: 1px solid var(--panel-control-border);
  border-radius: 12px;
  background: var(--panel-control);
}

.icon-btn {
  font-size: 0.94rem;
}

.inline-toggle {
  position: relative;
}

.inline-toggle input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}

.inline-toggle span[aria-hidden="true"] {
  color: var(--panel-muted);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.inline-toggle input:checked + span[aria-hidden="true"] {
  color: var(--panel-ink);
}

.inline-toggle:focus-within {
  outline: 2px solid var(--panel-glow);
  outline-offset: 1px;
}

.left-rail #road-controls,
.left-rail #grid-controls,
.left-rail #zone-controls,
.left-rail #control-controls {
  position: absolute;
  left: calc(100% + 10px);
  width: 220px;
  z-index: 80;
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
}

.left-rail #road-controls {
  top: 118px;
}

.left-rail #grid-controls {
  top: 296px;
}

.left-rail #zone-controls,
.left-rail #control-controls {
  top: 118px;
}

.canvas-wrap {
  position: relative;
  min-width: 0;
  display: grid;
  grid-template-rows: 44px minmax(0, 1fr);
  gap: 10px;
}

.sim-header {
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(15, 24, 37, 0.96), rgba(20, 30, 45, 0.92));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.28);
}

.time-header {
  color: #f3f9ff;
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: 0.03em;
}

canvas {
  width: 100%;
  height: 100%;
  border-radius: 14px;
  background: linear-gradient(180deg, #0f141c, #141a21);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
  display: block;
}

.perf-overlay {
  position: absolute;
  top: 56px;
  left: 12px;
  min-width: 164px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(199, 220, 242, 0.3);
  background: rgba(7, 13, 22, 0.78);
  color: #edf6ff;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  font-size: 0.66rem;
  line-height: 1.35;
  letter-spacing: 0.01em;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(4px);
  pointer-events: none;
  z-index: 20;
}

.perf-overlay .perf-title {
  margin-bottom: 4px;
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(183, 209, 234, 0.9);
}

.perf-overlay .perf-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.perf-overlay .perf-row b {
  font-weight: 700;
}

.stats-panel {
  overflow: visible;
}

.stats {
  margin: 0;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  display: grid;
  gap: 6px;
}

.stat-chip {
  min-height: 44px;
  border-radius: 11px;
  border: 1px solid rgba(149, 178, 206, 0.24);
  background: rgba(18, 30, 45, 0.9);
  display: grid;
  place-items: center;
  gap: 2px;
  text-align: center;
}

.stat-chip span {
  font-size: 0.55rem;
  color: var(--panel-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stat-chip b {
  font-size: 0.66rem;
  color: var(--panel-ink);
  font-family: "SFMono-Regular", "Menlo", monospace;
}

.stat-sub {
  font-size: 0.5rem;
  color: rgba(181, 205, 229, 0.85);
  letter-spacing: 0.02em;
  line-height: 1;
}

.demand-chip {
  padding: 4px 0 5px;
  align-content: center;
  gap: 1px;
}

.mini-bar {
  width: 80%;
  height: 4px;
  border-radius: 999px;
  background: rgba(173, 197, 220, 0.22);
  overflow: hidden;
}

.mini-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: rgba(123, 220, 246, 0.9);
}

.demand-res .mini-bar i {
  background: rgba(118, 223, 124, 0.92);
}

.demand-com .mini-bar i {
  background: rgba(130, 206, 255, 0.95);
}

.demand-ind .mini-bar i {
  background: rgba(255, 190, 102, 0.94);
}

@keyframes rail-reveal {
  from {
    opacity: 0;
    transform: translateY(8px);
    filter: blur(3px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

.ui-loading .panel > *,
.ui-loading .sim-header {
  opacity: 0;
  transform: translateY(8px);
  filter: blur(3px);
}

.ui-ready .panel > *,
.ui-ready .sim-header {
  opacity: 0;
  animation: rail-reveal 0.38s cubic-bezier(0.16, 0.84, 0.34, 1) forwards;
}

.ui-ready .left-rail > *:nth-child(1) {
  animation-delay: 0.02s;
}

.ui-ready .left-rail > *:nth-child(2) {
  animation-delay: 0.05s;
}

.ui-ready .left-rail > *:nth-child(3) {
  animation-delay: 0.08s;
}

.ui-ready .left-rail > *:nth-child(4) {
  animation-delay: 0.11s;
}

.ui-ready .left-rail > *:nth-child(5) {
  animation-delay: 0.14s;
}

.ui-ready .left-rail > *:nth-child(6) {
  animation-delay: 0.17s;
}

.ui-ready .left-rail > *:nth-child(7) {
  animation-delay: 0.2s;
}

.ui-ready .left-rail > *:nth-child(8) {
  animation-delay: 0.23s;
}

.ui-ready .right-rail > * {
  animation-delay: 0.14s;
}

.ui-ready .sim-header {
  animation-delay: 0.08s;
}

[data-tip] {
  position: relative;
}

[data-tip]::before,
[data-tip]::after {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  position: absolute;
  z-index: 100;
}

[data-tip]::before {
  content: "";
  top: 50%;
  left: calc(100% + 4px);
  transform: translate(-4px, -50%);
  border: 6px solid transparent;
  border-right-color: rgba(5, 10, 18, 0.97);
}

[data-tip]::after {
  content: attr(data-tip);
  top: 50%;
  left: calc(100% + 10px);
  transform: translate(-4px, -50%);
  white-space: nowrap;
  color: #f0f7ff;
  background: rgba(5, 10, 18, 0.97);
  border: 1px solid rgba(171, 203, 232, 0.26);
  border-radius: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.01em;
  padding: 6px 8px;
}

[data-tip]:hover::before,
[data-tip]:hover::after,
[data-tip]:focus-visible::before,
[data-tip]:focus-visible::after,
[data-tip]:focus-within::before,
[data-tip]:focus-within::after {
  opacity: 1;
  transform: translate(0, -50%);
}

.right-rail [data-tip]::before {
  left: auto;
  right: calc(100% + 4px);
  transform: translate(4px, -50%);
  border-right-color: transparent;
  border-left-color: rgba(5, 10, 18, 0.97);
}

.right-rail [data-tip]::after {
  left: auto;
  right: calc(100% + 10px);
  transform: translate(4px, -50%);
}

.right-rail [data-tip]:hover::before,
.right-rail [data-tip]:hover::after,
.right-rail [data-tip]:focus-visible::before,
.right-rail [data-tip]:focus-visible::after,
.right-rail [data-tip]:focus-within::before,
.right-rail [data-tip]:focus-within::after {
  transform: translate(0, -50%);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
    height: auto;
    padding: 10px;
  }

  .left-rail,
  .right-rail {
    padding: 10px;
  }

  .left-rail #road-controls,
  .left-rail #grid-controls,
  .left-rail #zone-controls,
  .left-rail #control-controls {
    position: static;
    width: 100%;
    box-shadow: none;
    backdrop-filter: none;
  }

  .left-rail > .controls.controls-icons > h2 {
    display: block;
  }

  #tool-buttons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  #speed-buttons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .compact-row {
    flex-direction: row;
  }

  .icon-btn,
  .inline-toggle {
    width: 42px;
  }

  .sim-header {
    min-height: 42px;
  }

  .canvas-wrap {
    grid-template-rows: 42px auto;
  }

  canvas {
    height: 58vh;
  }

  .perf-overlay {
    top: 52px;
    left: 8px;
    min-width: 148px;
    padding: 7px 8px;
  }

  .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }

  [data-tip]::before,
  [data-tip]::after {
    display: none;
  }
}