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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242736;
  --border: #2e3248;
  --accent: #e3000b;      /* brick red */
  --accent2: #ffcf00;     /* brick yellow */
  --text: #e8eaf0;
  --text-muted: #7a7f99;
  --success: #4caf50;
  --sidebar-w: 300px;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  /* Prevent iOS pull-to-refresh and scroll bounce without breaking touch coordinates */
  overscroll-behavior: none;
}

/* ─── Layout ─────────────────────────────────── */
#app {
  display: flex;
  height: 100vh;
  height: 100dvh; /* dynamic viewport height — stable on mobile as browser chrome toggles */
}

#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 10;
}

#main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#panels {
  flex: 1;
  display: flex;
  overflow: hidden;
}

#map-panel {
  flex: 1;
  position: relative;
}

#preview-panel {
  width: 0;
  flex-shrink: 0;
  background: var(--surface);
  border-left: 1px solid var(--border);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

#preview-panel.visible {
  width: 50%;
}

#map {
  width: 100%;
  height: 100%;
}

/* ─── Header ─────────────────────────────────── */
#header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

#header .logo-bricks {
  display: flex;
  gap: 3px;
}

.logo-brick {
  width: 14px;
  height: 14px;
  border-radius: 2px;
}

#header h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

#header h1 span {
  color: var(--accent);
}

/* ─── Sidebar sections ────────────────────────── */
.sidebar-section {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-section h2 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ─── Step indicators ─────────────────────────── */
.steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.step.active {
  background: rgba(227, 0, 11, 0.08);
  border-color: rgba(227, 0, 11, 0.3);
}

.step.done {
  background: rgba(76, 175, 80, 0.08);
  border-color: rgba(76, 175, 80, 0.3);
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--surface2);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
  transition: all 0.2s;
}

.step.active .step-num {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.step.done .step-num {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

.step.done .step-num::after {
  content: '✓';
}

.step-label {
  font-size: 13px;
  color: var(--text-muted);
}

.step.active .step-label,
.step.done .step-label {
  color: var(--text);
}

/* ─── Form controls ───────────────────────────── */
.field {
  margin-bottom: 12px;
}

.field label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

.field select,
.field input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

.field select:focus,
.field input[type="number"]:focus {
  border-color: var(--accent);
}

.field select option {
  background: var(--surface2);
}

/* ─── Info box ────────────────────────────────── */
#area-info {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-muted);
  min-height: 80px;
}

#area-info .info-val {
  color: var(--text);
  font-weight: 600;
}

#area-info .info-accent {
  color: var(--accent2);
  font-weight: 700;
}

/* ─── Buttons ─────────────────────────────────── */
.btn {
  width: 100%;
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: #c8000a;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(227, 0, 11, 0.3);
}

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent2);
  color: var(--accent2);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

.btn-draw {
  background: var(--accent2);
  color: #1a1a1a;
  margin-bottom: 8px;
}

.btn-draw:hover:not(:disabled) {
  background: #e6b800;
}

/* ─── Progress ────────────────────────────────── */
#progress-wrap {
  display: none;
  flex-direction: column;
  gap: 8px;
}

#progress-wrap.visible {
  display: flex;
}

#progress-bar-bg {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}

#progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}

#progress-label {
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
}

/* ─── Stats ───────────────────────────────────── */
#stats-wrap {
  display: none;
  flex-direction: column;
  gap: 6px;
}

#stats-wrap.visible {
  display: flex;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.stat-row .stat-key {
  color: var(--text-muted);
}

.stat-row .stat-val {
  font-weight: 700;
  color: var(--accent2);
}

/* ─── Elevation legend ────────────────────────── */
#legend {
  display: none;
  flex-direction: column;
  gap: 5px;
}

#legend.visible {
  display: flex;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--text-muted);
}

.legend-swatch {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ─── 3D Preview panel ────────────────────────── */
/* Canvas container fills the panel absolutely so height:100% always resolves correctly
   regardless of whether the panel parent is a flex container */
#preview-canvas {
  position: absolute;
  inset: 0;
}

#preview-panel canvas {
  display: block;
}

/* ─── Brick colour picker ─────────────────────────── */
#brick-color-picker {
  position: absolute;
  background: rgba(15, 17, 23, 0.96);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  z-index: 20;
  min-width: 220px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.picker-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.picker-header button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  padding: 0 2px;
  line-height: 1;
}

.picker-header button:hover { color: var(--text); }

#picker-swatches {
  display: grid;
  grid-template-columns: repeat(10, 20px);
  gap: 3px;
}

.picker-swatch {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.1s, border-color 0.1s;
}

.picker-swatch:hover {
  transform: scale(1.25);
  z-index: 1;
}

.picker-swatch.selected {
  border-color: #fff;
  transform: scale(1.15);
}

#bulk-recolor-panel {
  position: absolute;
  top: 40px;
  right: 10px;
  width: 260px;
  background: rgba(15, 17, 23, 0.96);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  z-index: 20;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.bulk-section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 8px 0 5px;
}

.bulk-section-label:first-of-type { margin-top: 2px; }

#bulk-source-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

#bulk-palette-swatches {
  display: grid;
  grid-template-columns: repeat(10, 20px);
  gap: 3px;
}

.bulk-source-swatch {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.1s, border-color 0.1s;
  position: relative;
}

.bulk-source-swatch:hover { transform: scale(1.2); }

.bulk-source-swatch.selected {
  border-color: var(--accent);
  transform: scale(1.1);
}

#preview-toolbar-top {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 6px;
  z-index: 5;
}

#preview-toolbar-top button {
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: rgba(26, 29, 39, 0.85);
  backdrop-filter: blur(4px);
  color: var(--text);
  border-radius: 6px;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s;
}

#preview-toolbar-top button:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

#preview-toolbar-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(15, 17, 23, 0.90);
  backdrop-filter: blur(6px);
  border-top: 1px solid var(--border);
  z-index: 5;
}

.snap-btn {
  padding: 10px 20px;
  background: var(--accent2);
  color: #1a1a1a;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.3px;
  transition: all 0.2s;
  flex-shrink: 0;
}

.snap-btn:hover {
  background: #e6b800;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(255, 207, 0, 0.35);
}

.bulk-btn {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.bulk-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
  transform: translateY(-1px);
  box-shadow: none;
}

.snap-btn.snapped {
  background: var(--surface2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  box-shadow: none;
  transform: none;
}

.edit-toggle-btn {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.edit-toggle-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
  transform: translateY(-1px);
  box-shadow: none;
}

.edit-toggle-btn.active {
  background: var(--surface2);
  color: var(--accent2);
  border: 1px solid var(--accent2);
  box-shadow: 0 0 8px rgba(255, 207, 0, 0.2);
}

.preview-exports {
  display: flex;
  gap: 8px;
}

.preview-exports button {
  padding: 8px 14px;
  border: 1px solid var(--border);
  background: rgba(36, 39, 54, 0.9);
  color: var(--text);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.preview-exports button:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

#preview-label {
  position: absolute;
  top: 10px;
  left: 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  pointer-events: none;
}

#preview-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  gap: 16px;
  z-index: 4;
}

#preview-loading.hidden {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#preview-loading p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ─── Map draw hint ───────────────────────────── */
#map-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(26, 29, 39, 0.92);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 13px;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 500;
  transition: opacity 0.3s;
  white-space: nowrap;
}

#map-hint.hidden {
  opacity: 0;
}

/* ─── Leaflet overrides ───────────────────────── */
.leaflet-container {
  background: #0a0e1a;
}

.leaflet-draw-toolbar a {
  background-color: var(--surface2) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

.leaflet-bar a {
  background-color: var(--surface2) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

.leaflet-bar a:hover {
  background-color: var(--surface) !important;
}

/* ─── Scrollbar ───────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── Mobile menu / close buttons (hidden on desktop) ─── */
.btn-menu {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  flex-shrink: 0;
}

.btn-sidebar-close {
  display: none;
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 2px 4px;
  line-height: 1;
  flex-shrink: 0;
}

.btn-sidebar-close:hover { color: var(--text); }

/* ─── Sidebar backdrop (mobile overlay) ──────── */
#sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 1000;
}

#sidebar-backdrop.visible { display: block; }

/* ─── Mobile layout (≤ 768px) ────────────────── */
@media (max-width: 768px) {

  /* Show hamburger and sidebar close button */
  .btn-menu         { display: block; }
  .btn-sidebar-close { display: block; }

  /* Sidebar becomes a fixed drawer sliding in from the left,
     z-index above Leaflet controls (~800) and the backdrop */
  #sidebar {
    position: fixed;
    top: 0;
    left: calc(-1 * var(--sidebar-w) - 2px);
    height: 100%;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
  }

  #sidebar.open { left: 0; }

  /* Panels stack vertically */
  #panels { flex-direction: column; }

  /* Map gets roughly half the remaining viewport height */
  #map-panel {
    flex: 1;
  }

  /* 3D preview: hidden by default, visible once .visible is added */
  #preview-panel {
    width: 100% !important;
    flex: 0;
    min-height: 0;
    overflow: hidden;
    border-left: none;
    border-top: 1px solid var(--border);
  }

  #preview-panel.visible {
    flex: 1;
    min-height: 200px; /* ensure enough room for the canvas + bottom toolbar */
  }

  /* Bottom toolbar wraps and uses tighter padding */
  #preview-toolbar-bottom {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 6px;
    padding: 8px 10px;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
  }

  .snap-btn {
    padding: 8px 12px;
    font-size: 12px;
  }

  /* Export buttons wrap */
  .preview-exports {
    flex-wrap: wrap;
    gap: 6px;
  }

  .preview-exports button {
    font-size: 11px;
    padding: 6px 10px;
  }

  /* Bulk recolor panel goes full-width */
  #bulk-recolor-panel {
    left: 5px;
    right: 5px;
    width: auto;
    max-height: 55vh;
    overflow-y: auto;
  }

  /* Brick colour picker: full-width, pinned to top so it never hides behind the bottom toolbar */
  #brick-color-picker {
    left: 10px !important;
    right: 10px !important;
    top: 10px !important;
    width: auto;
    min-width: unset;
    max-height: 55vh;
    overflow-y: auto;
  }

  /* Larger swatches for touch targets */
  #picker-swatches,
  #bulk-palette-swatches {
    grid-template-columns: repeat(auto-fill, 28px);
    gap: 4px;
  }

  .picker-swatch,
  .bulk-source-swatch {
    width: 28px;
    height: 28px;
  }
}