/* LEGO Layout Visualizer — Redesigned with bold aesthetic */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

/* ================================================================
   PALETTE — deep navy foundation, electric coral accent
   ================================================================ */

:root, [data-theme="dark"] {
  --bg: #141418;
  --surface: #1c1c22;
  --surface2: #26262e;
  --surface3: #303038;
  --accent: #6c8cff;
  --accent-glow: rgba(108, 140, 255, 0.12);
  --accent-dim: #5570d4;
  --text: #e4e4ec;
  --text-dim: #7a7a8e;
  --border: #2e2e38;
  --border-hover: #44444f;
  --editor-bg: #18181e;
  --cell-border: #36363f;
  --line-num: #44444f;
  --success: #3dd9a0;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', 'JetBrains Mono', monospace;
  --radius: 8px;
  --radius-sm: 5px;
}

[data-theme="light"] {
  --bg: #f0f1f6;
  --surface: #ffffff;
  --surface2: #ebedf5;
  --surface3: #dfe2ed;
  --accent: #e63362;
  --accent-glow: rgba(230, 51, 98, 0.08);
  --accent-dim: #c42a54;
  --text: #1a1d2e;
  --text-dim: #7c819e;
  --border: #d4d7e5;
  --border-hover: #b0b5cc;
  --editor-bg: #f7f8fb;
  --cell-border: #c0c4d8;
  --line-num: #b0b5cc;
}

[data-theme="light"] .cell text { fill: #2a2d3e; }
[data-theme="light"] .hl-op { color: #0550ae; }
[data-theme="light"] .hl-type { color: #7c3aed; }
[data-theme="light"] .hl-ssa { color: #c2410c; }
[data-theme="light"] .hl-num { color: #c2410c; }
[data-theme="light"] .hl-kw { color: #15803d; }
[data-theme="light"] .hl-string { color: #15803d; }
[data-theme="light"] .hl-comment { color: #94a3b8; }

/* ================================================================
   RESET & BASE
   ================================================================ */

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Ambient glow — subtle radial light behind the UI in dark mode */
[data-theme="dark"] body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 70% 50% at 15% 20%, rgba(108, 140, 255, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 85% 80%, rgba(34, 197, 94, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 90% 40% at 50% -5%, rgba(140, 160, 255, 0.10) 0%, transparent 60%);
}

[data-theme="dark"] header,
[data-theme="dark"] #editor-panel,
[data-theme="dark"] #compiler-panel {
  position: relative; z-index: 1;
}

[data-theme="dark"] #app { position: relative; z-index: 1; }

/* Subtle border glow on panels */
[data-theme="dark"] #editor-panel {
  box-shadow: inset -1px 0 0 rgba(108, 140, 255, 0.1);
}
[data-theme="dark"] #compiler-panel {
  box-shadow: inset 1px 0 0 rgba(108, 140, 255, 0.1);
}
[data-theme="dark"] header {
  box-shadow: 0 1px 0 rgba(108, 140, 255, 0.1), 0 4px 20px rgba(0,0,0,0.3);
}

/* ================================================================
   HEADER — tight, confident, single-line
   ================================================================ */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 44px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  white-space: nowrap;
}

header h1 span {
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Presets — subtle, grouped */
.presets {
  display: flex;
  gap: 2px;
  background: var(--surface2);
  border-radius: 6px;
  padding: 2px;
}

.preset-btn {
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--text-dim);
  padding: 5px 11px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  color: var(--text);
  background: var(--surface3);
}

.preset-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* Run button — prominent, separated */
#run-btn {
  background: #22c55e;
  border: none;
  border-radius: 6px;
  color: #fff;
  padding: 7px 28px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.3px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 12px rgba(34, 197, 94, 0.25);
}

#run-btn:hover { background: #16a34a; transform: translateY(-1px); box-shadow: 0 4px 20px rgba(34, 197, 94, 0.35); }
#run-btn:active { transform: translateY(0); }
#run-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; background: var(--text-dim); }

#theme-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-dim);
  width: 30px; height: 30px;
  font-size: 14px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
#theme-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ================================================================
   LAYOUT — flexbox 3-column + dividers
   ================================================================ */

#app {
  display: flex;
  height: calc(100vh - 44px);
  overflow: hidden;
  background: var(--bg);
}

/* Dividers */
.divider-v {
  width: 4px; flex: none; cursor: col-resize;
  background: var(--border);
  transition: background 0.2s;
  position: relative;
}
.divider-v::after {
  content: ''; position: absolute; inset: 0 -4px;
}
.divider-v:hover, .divider-v.active { background: var(--accent); }

.divider-h {
  height: 4px; flex: none; cursor: row-resize;
  background: var(--border);
  transition: background 0.2s;
  position: relative;
}
.divider-h::after {
  content: ''; position: absolute; inset: -4px 0;
}
.divider-h:hover, .divider-h.active { background: var(--accent); }

/* ================================================================
   EDITOR PANEL (left)
   ================================================================ */

#editor-panel {
  display: flex;
  flex-direction: column;
  width: 25%;
  min-width: 180px;
  background: var(--surface);
}

.panel-header {
  padding: 0 12px;
  height: 36px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

.panel-header h3 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--text-dim);
}

/* Tabs */
.panel-tabs { display: flex; gap: 0; }
.tab-btn {
  background: none; border: none;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1.2px;
  padding: 8px 14px; cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Tab content */
.tab-content { display: none; flex: 1; min-height: 0; overflow: hidden; }
.tab-content.active { display: flex; flex-direction: column; }
#builder-tab.active { overflow: auto; }
#code-tab.active { overflow: hidden; }
#code-tab.active { display: flex; }

/* ================================================================
   BUILDER — clean, card-based, intentional
   ================================================================ */

.builder-section {
  padding: 14px 14px 12px;
  border-bottom: 1px solid var(--border);
}

.builder-section > label {
  display: flex; align-items: center; gap: 8px;
  font-size: 10px; text-transform: uppercase; font-weight: 700;
  letter-spacing: 1.8px; color: var(--text-dim);
  margin-bottom: 10px;
}

.builder-section > label::before {
  content: '';
  width: 3px; height: 12px;
  background: var(--accent);
  border-radius: 2px;
}

/* Shared inputs */
.builder-input {
  background: var(--surface3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 500;
  outline: none;
  transition: all 0.2s;
}
.builder-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}
select.builder-input {
  cursor: pointer;
  padding-right: 24px;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%236b7094' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}
input.builder-input {
  width: 3.5em; min-width: 3.5em;
  text-align: center;
  padding: 5px 4px;
  -moz-appearance: textfield;
}
input.builder-input::-webkit-outer-spin-button,
input.builder-input::-webkit-inner-spin-button {
  -webkit-appearance: none; margin: 0;
}

/* Cards */
.perm-card, .tile-level {
  background: var(--editor-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  margin-bottom: 6px;
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  transition: all 0.2s;
}
.perm-card:hover, .tile-level:hover {
  border-color: var(--border-hover);
  background: var(--surface2);
}

.perm-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.perm-indices {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.dims-inputs {
  display: inline-flex;
  gap: 3px;
}

/* Buttons */
.btn-remove {
  background: none; border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 18px; line-height: 1;
  padding: 0 4px; margin-left: auto;
  opacity: 0; transition: all 0.2s;
}
.perm-card:hover .btn-remove,
.tile-level:hover .btn-remove { opacity: 0.6; }
.btn-remove:hover { color: var(--accent); opacity: 1 !important; }

.btn-add-dim {
  background: var(--surface3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 600;
  padding: 4px 8px; cursor: pointer;
  transition: all 0.2s;
}
.btn-add-dim:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.btn-add {
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 11px; font-weight: 600;
  padding: 7px 12px;
  cursor: pointer;
  width: 100%; margin-top: 8px;
  transition: all 0.2s;
  letter-spacing: 0.5px;
}
.btn-add:hover {
  border-color: var(--accent);
  color: var(--accent);
  border-style: solid;
  background: var(--accent-glow);
}

.wrap-select { margin-bottom: 10px; }

.groupby-dims {
  display: flex; align-items: center; gap: 6px;
  margin-top: 6px; flex-wrap: wrap;
}

/* ================================================================
   CODE EDITOR
   ================================================================ */

#code-editor-wrapper {
  flex: 1; min-height: 0;
  display: flex;
  background: var(--editor-bg);
  overflow: hidden;
}

#line-numbers {
  padding: 12px 0; padding-right: 10px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12px; line-height: 1.6;
  color: var(--line-num);
  user-select: none;
  min-width: 36px;
  border-right: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
}

#code-editor {
  flex: 1; width: 0; height: 100%;
  background: var(--editor-bg);
  color: var(--text);
  border: none; resize: none;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 12px; line-height: 1.6;
  outline: none; tab-size: 4;
  overflow: auto;
  caret-color: var(--accent);
}

/* Error */
#error-output {
  display: none;
  background: rgba(248, 81, 73, 0.08);
  border-top: 2px solid #f85149;
  padding: 8px 14px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: #f85149;
  max-height: 80px;
  overflow-y: auto;
  white-space: pre-wrap;
}
#error-output.visible { display: block; }

/* Status bar */
#formula-output {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  padding: 4px 14px;
  border-top: 1px solid var(--border);
  min-height: 22px;
  letter-spacing: 0.3px;
}

/* ================================================================
   VISUALIZATION (center)
   ================================================================ */

#viz-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: auto;
  min-width: 200px;
  flex: 1;
  background: var(--bg);
}

#viz-container {
  display: flex;
  align-items: center;
  gap: 0;
}

.viz-section {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.viz-section h4 {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

svg { display: block; }
svg.connections-svg { overflow: visible; }

/* Cells */
.cell rect {
  stroke: var(--cell-border);
  stroke-width: 0.5;
}

.cell text {
  font-family: var(--font-mono);
  fill: #2a2d3e;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-weight: 600;
  font-size: 11px;
}

svg.has-hover .cell rect { opacity: 0.2; }
svg.has-hover .cell text { opacity: 0.2; }
svg.has-hover .cell.highlighted rect { opacity: 1; stroke: white; stroke-width: 2; }
svg.has-hover .cell.highlighted text { opacity: 1; }

/* Connections */
.connection {
  fill: none;
  stroke-width: 1;
  opacity: 0.12;
  pointer-events: none;
}
svg.has-hover .connection { opacity: 0.03; }
svg.has-hover .connection.highlighted { opacity: 1; stroke-width: 2.5; }

/* Empty state */
.empty-state {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}
.empty-state .icon {
  font-size: 40px;
  margin-bottom: 12px;
  opacity: 0.2;
}

/* ================================================================
   COMPILER PANEL (right)
   ================================================================ */

#compiler-panel {
  background: var(--surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  width: 25%;
  min-width: 180px;
}

.compiler-section {
  padding: 10px 14px;
  flex: 1;
  min-height: 60px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.compiler-section h3 {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  margin-bottom: 8px;
  flex: none;
}

.compiler-section pre {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--text-dim);
  white-space: pre;
  margin: 0;
  overflow: auto;
  flex: 1;
  min-height: 0;
  background: var(--editor-bg);
  padding: 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* MLIR syntax highlighting */
.hl-op { color: #7fadff; }
.hl-type { color: #c4a0f5; }
.hl-ssa { color: #f0a67a; }
.hl-num { color: #f0a67a; }
.hl-kw { color: #7ee8b0; font-weight: 600; }
.hl-string { color: #7ee8b0; }
.hl-comment { color: #5a5a6e; font-style: italic; }

/* ================================================================
   AUTOCOMPLETE
   ================================================================ */

#autocomplete-dropdown {
  display: none;
  position: fixed;
  z-index: 1000;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  min-width: 240px;
  max-height: 200px;
  overflow-y: auto;
  padding: 4px;
  backdrop-filter: blur(12px);
}

.ac-item {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 10px; cursor: pointer;
  font-size: 12px; border-radius: var(--radius-sm);
  transition: background 0.1s;
}
.ac-item:hover, .ac-item.ac-active { background: var(--surface3); }

.ac-text {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent);
}

.ac-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
}

/* ================================================================
   RESPONSIVE
   ================================================================ */

@media (max-width: 900px) {
  #app { flex-direction: column; }
  #editor-panel { width: 100% !important; height: 180px; min-width: 0; }
  #viz-panel { min-width: 0; }
  #compiler-panel { width: 100% !important; height: 200px; min-width: 0; }
  .divider-v { display: none; }
}