:root {
  --bg: #05070b;
  --panel: rgba(13, 17, 24, 0.9);
  --panel-border: rgba(255, 255, 255, 0.09);
  --text: #e8eef8;
  --muted: #9aa4b4;
  --accent: #13d8ff;
  --accent-2: #ff4b78;
  --accent-3: #f5e61a;
  --accent-4: #3bf07f;
  --bar: #c9ccd4;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --mono: "JetBrains Mono", Menlo, Consolas, monospace;
  --display: "Space Grotesk", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 12% 12%, rgba(19, 216, 255, 0.11), transparent 38%),
    radial-gradient(circle at 82% 20%, rgba(255, 75, 120, 0.09), transparent 42%),
    radial-gradient(circle at 48% 85%, rgba(59, 240, 127, 0.08), transparent 42%),
    var(--bg);
  color: var(--text);
  font-family: var(--display);
  line-height: 1.35;
}

.background-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.38;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at 50% 10%, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0.25) 75%, transparent);
}

.app-shell {
  position: relative;
  max-width: 1320px;
  margin: 0 auto;
  padding: 18px 16px 28px;
}

.tool-nav {
  display: flex;
  gap: 10px;
  padding: 8px;
  margin-bottom: 14px;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 9px 12px;
  text-decoration: none;
  color: var(--muted);
  border: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(255, 255, 255, 0.02);
  font-weight: 600;
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}

.tool-link:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.16);
}

.tool-link.is-active {
  color: #dcfbff;
  border-color: rgba(19, 216, 255, 0.28);
  background: rgba(19, 216, 255, 0.08);
}

.panel {
  background: linear-gradient(180deg, rgba(19, 24, 34, 0.96), rgba(10, 14, 20, 0.95));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.hero-panel {
  padding: 18px 18px 14px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-family: var(--mono);
}

.hero-panel h1,
.panel h2 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-panel h1 {
  font-size: clamp(1.7rem, 4vw, 3rem);
}

.hero-description {
  margin: 10px 0 0;
  color: var(--muted);
  max-width: 78ch;
}

.complexity-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.complexity-chip {
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.complexity-chip span {
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--mono);
}

.complexity-chip strong {
  font-size: 0.98rem;
  font-weight: 600;
}

.workspace-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  grid-template-areas:
    "visual controls"
    "editor controls";
  align-items: start;
}

.visual-panel {
  grid-area: visual;
  padding: 14px;
}

.controls-panel {
  grid-area: controls;
  padding: 14px;
}

.editor-panel {
  grid-area: editor;
  padding: 14px;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-header.compact {
  margin-bottom: 8px;
}

.meta-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
}

.status-pill,
.meta-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.78rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font-family: var(--mono);
  white-space: nowrap;
}

.status-pill {
  border-color: rgba(19, 216, 255, 0.25);
  color: #b7f6ff;
  background: rgba(19, 216, 255, 0.08);
}

.canvas-wrap {
  position: relative;
  height: min(50vh, 420px);
  min-height: 240px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(6, 8, 13, 0.9), rgba(4, 5, 7, 0.96));
}

#sortCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.87rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.swatch {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  display: inline-block;
}

.swatch-default {
  background: var(--bar);
}

.swatch-read {
  background: var(--accent);
}

.swatch-write {
  background: var(--accent-2);
}

.swatch-pivot {
  background: var(--accent-3);
}

.swatch-done {
  background: var(--accent-4);
}

.trace-info {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.role-readout {
  margin-top: 10px;
  min-height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01)),
    rgba(5, 7, 11, 0.55);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 10px;
}

.role-readout.is-empty {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.role-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 9px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--mono);
  font-size: 0.77rem;
  line-height: 1;
}

.role-chip-label {
  font-weight: 700;
}

.role-chip-meta {
  color: var(--muted);
}

.control-group {
  margin-top: 12px;
}

.control-group:first-of-type {
  margin-top: 0;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.86rem;
  color: #d5deeb;
}

.inline-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.inline-controls.wrap {
  flex-wrap: wrap;
}

.inline-controls.tight {
  gap: 7px;
}

.inline-label {
  margin: 0;
  white-space: nowrap;
  color: var(--muted);
}

.inline-value {
  color: var(--muted);
  min-width: 56px;
  text-align: right;
  font-family: var(--mono);
  font-size: 0.82rem;
}

select,
.mono-input,
.mini-editor,
button {
  font: inherit;
}

select,
.mono-input,
.mini-editor {
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}

select:focus,
.mono-input:focus,
.mini-editor:focus,
.code-editor:focus {
  border-color: rgba(19, 216, 255, 0.45);
  box-shadow: 0 0 0 3px rgba(19, 216, 255, 0.13);
}

.mono-input,
.mini-editor {
  font-family: var(--mono);
  font-size: 0.9rem;
}

.mini-editor {
  resize: vertical;
  min-height: 74px;
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.button-grid {
  margin-top: 14px;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.btn {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  transition: transform 100ms ease, border-color 100ms ease, background-color 100ms ease;
  font-weight: 600;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(180deg, rgba(19, 216, 255, 0.2), rgba(19, 216, 255, 0.08));
  border-color: rgba(19, 216, 255, 0.32);
  color: #dcfbff;
}

.btn-secondary {
  background: linear-gradient(180deg, rgba(255, 75, 120, 0.18), rgba(255, 75, 120, 0.06));
  border-color: rgba(255, 75, 120, 0.25);
}

.btn-ghost {
  color: #d3deef;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  margin-left: 4px;
  font-size: 0.85rem;
}

.switch input {
  accent-color: var(--accent);
}

.helper-note {
  color: var(--muted);
  font-size: 0.8rem;
}

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

.error-box {
  margin-top: 12px;
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 75, 120, 0.35);
  background: rgba(255, 75, 120, 0.08);
  color: #ffd7e2;
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: pre-wrap;
}

.is-hidden {
  display: none;
}

.editor-frame {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  overflow: hidden;
  display: grid;
  grid-template-columns: auto 1fr;
  min-height: 360px;
  background: linear-gradient(180deg, rgba(9, 12, 17, 0.92), rgba(6, 8, 11, 0.98));
}

.line-numbers {
  margin: 0;
  padding: 14px 10px 14px 12px;
  min-width: 48px;
  text-align: right;
  color: #5f6b7c;
  background: rgba(255, 255, 255, 0.015);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
  white-space: pre;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.45;
}

.code-editor {
  width: 100%;
  height: 100%;
  min-height: 360px;
  border: 0;
  outline: none;
  resize: vertical;
  background: transparent;
  color: #e8eef8;
  padding: 14px;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.45;
  tab-size: 2;
}

.code-editor::selection,
.mini-editor::selection,
.mono-input::selection {
  background: rgba(19, 216, 255, 0.24);
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mode-btn.is-selected {
  border-color: rgba(19, 216, 255, 0.32);
  background: rgba(19, 216, 255, 0.08);
  color: #dcfbff;
}

.maze-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
}

.maze-visual-panel,
.maze-controls-panel {
  padding: 14px;
}

.maze-canvas-wrap {
  position: relative;
  height: min(65vh, 720px);
  min-height: 340px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(6, 8, 13, 0.9), rgba(4, 5, 7, 0.96));
}

#mazeCanvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

.maze-button-grid {
  margin-top: 0;
}

.maze-button-grid.compact-grid {
  grid-template-columns: 1fr 1fr;
}

.maze-swatch-wall {
  background: rgba(166, 171, 180, 0.7);
}

.maze-swatch-frontier {
  background: rgba(19, 216, 255, 0.95);
}

.maze-swatch-visited {
  background: rgba(107, 193, 255, 0.8);
}

.maze-swatch-path {
  background: rgba(245, 230, 26, 0.95);
}

.maze-swatch-start {
  background: linear-gradient(90deg, rgba(59, 240, 127, 0.95) 0 50%, rgba(255, 75, 120, 0.95) 50% 100%);
}

@media (max-width: 980px) {
  .workspace-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "visual"
      "controls"
      "editor";
  }

  .complexity-strip {
    grid-template-columns: 1fr;
  }

  .split-grid {
    grid-template-columns: 1fr;
  }

  .button-grid {
    grid-template-columns: 1fr 1fr;
  }

  .canvas-wrap {
    height: 300px;
  }

  .editor-frame,
  .code-editor {
    min-height: 300px;
  }

  .maze-grid {
    grid-template-columns: 1fr;
  }

  .maze-canvas-wrap {
    height: 440px;
  }
}

@media (max-width: 600px) {
  .app-shell {
    padding: 12px 10px 18px;
  }

  .panel {
    border-radius: 14px;
  }

  .hero-panel,
  .visual-panel,
  .controls-panel,
  .editor-panel,
  .maze-visual-panel,
  .maze-controls-panel {
    padding: 12px;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .meta-row {
    justify-content: flex-start;
  }

  .button-grid {
    grid-template-columns: 1fr;
  }

  .canvas-wrap {
    height: 260px;
  }

  .maze-canvas-wrap {
    min-height: 300px;
    height: 360px;
  }

  .mode-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
}