/* =========================================
   Mega Tile Generator — Stylesheet
   ========================================= */

:root {
  --bg: #0f0f10;
  --panel: #17181a;
  --panel-2: #1f2022;
  --border: #2a2b2e;
  --border-light: #34363a;
  --text: #e7e8ea;
  --text-dim: #9a9ca1;
  --text-faint: #6b6d73;
  --accent: #3b82f6;
  --accent-hover: #4f8dff;
  --danger: #ef4444;
  --hover: #242528;
  --active: #2d2f33;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 6px;
  --radius-sm: 4px;
  --radius-lg: 10px;
  --sidebar-w: 280px;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button { font-family: inherit; border: none; background: none; color: inherit; cursor: pointer; }
input, select { font-family: inherit; color: inherit; }
svg { display: block; }

/* ================ LAYOUT ================ */
#app {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: margin-left 0.25s ease;
}

#sidebar.collapsed { margin-left: calc(-1 * var(--sidebar-w)); }

#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ================ SIDEBAR ================ */
.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 13px; color: var(--text); }
.logo svg { color: var(--accent); }

#sidebar > .panel,
#sidebar > .layers-panel,
#sidebar > .props-panel { flex-shrink: 0; }

#sidebar { overflow-y: auto; }

.panel {
  border-bottom: 1px solid var(--border);
  padding: 10px 12px 12px;
}
.panel-title {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.panel-actions { display: flex; gap: 2px; }

/* Shape grid */
.shape-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin-bottom: 8px;
}
.shape-btn {
  aspect-ratio: 1;
  background: var(--panel-2);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  transition: all 0.15s;
}
.shape-btn:hover {
  background: var(--hover);
  color: var(--text);
  border-color: var(--border-light);
}
.shape-btn svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  stroke: currentColor;
  stroke-width: 1.5;
}
.shape-btn[data-shape="line"] svg { fill: none; }

.upload-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px;
  background: var(--panel-2);
  border: 1px dashed var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s;
}
.upload-btn:hover {
  background: var(--hover);
  color: var(--text);
  border-color: var(--accent);
}

/* Layers */
.layers-panel { display: flex; flex-direction: column; max-height: 320px; }
.layer-list {
  overflow-y: auto;
  flex: 1;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.layer-list:empty::before {
  content: "No layers yet";
  display: block;
  text-align: center;
  color: var(--text-faint);
  padding: 16px 8px;
  font-size: 12px;
  font-style: italic;
}
.layer-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s;
  user-select: none;
}
.layer-item:hover { background: var(--hover); }
.layer-item.selected { background: rgba(59, 130, 246, 0.15); outline: 1px solid rgba(59,130,246,0.4); }
.layer-item.dragging { opacity: 0.5; }
.layer-item.drop-above { border-top: 2px solid var(--accent); }
.layer-item.drop-below { border-bottom: 2px solid var(--accent); }
.layer-icon {
  width: 16px; height: 16px;
  color: var(--text-dim);
  flex-shrink: 0;
}
.layer-icon svg { width: 16px; height: 16px; stroke: currentColor; fill: currentColor; }
.layer-name {
  flex: 1;
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  background: none;
  border: none;
  color: var(--text);
  min-width: 0;
}
.layer-name[readonly] { cursor: pointer; }
.layer-toggle {
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-faint);
  border-radius: 3px;
  flex-shrink: 0;
}
.layer-toggle:hover { background: var(--active); color: var(--text); }
.layer-toggle.on { color: var(--text); }
.layer-item.hidden .layer-icon,
.layer-item.hidden .layer-name { opacity: 0.4; }

/* Properties */
.props-panel { max-height: 420px; overflow-y: auto; }
.props-content { display: flex; flex-direction: column; gap: 8px; }
.empty-props { color: var(--text-faint); font-style: italic; text-align: center; padding: 12px; font-size: 12px; }
.prop-row { display: flex; align-items: center; gap: 8px; min-height: 26px; }
.prop-row label:not(.checkbox-label) {
  width: 70px;
  color: var(--text-dim);
  font-size: 11px;
  flex-shrink: 0;
}
.prop-row input[type="number"],
.prop-row input[type="text"] {
  flex: 1;
  min-width: 0;
  padding: 5px 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 12px;
  outline: none;
  width: 100%;
}
.prop-row input:focus { border-color: var(--accent); }
.prop-row input[type="range"] { flex: 1; min-width: 0; accent-color: var(--accent); }

.prop-row-split {
  display: grid;
  grid-template-columns: 70px 1fr 1fr;
  gap: 4px;
  align-items: center;
}
.prop-row-split input { width: 100%; }

.color-input {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
}
.color-input input[type="color"] {
  width: 28px;
  height: 24px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.color-input input[type="text"] {
  flex: 1;
  font-family: monospace;
  font-size: 11px;
  padding: 4px 6px;
  min-width: 60px;
}
.mini-btn {
  width: 22px;
  height: 22px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.mini-btn:hover { background: var(--hover); color: var(--text); }
.mini-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.checkbox-label {
  display: flex !important;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  width: auto !important;
}
.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent);
}
.checkbox-label.inline { margin-left: 8px; }

/* ================ TOPBAR ================ */
#topbar {
  height: 48px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  gap: 8px;
  flex-shrink: 0;
}
.topbar-left, .topbar-right, .topbar-center {
  display: flex;
  align-items: center;
  gap: 6px;
}
.topbar-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.filename-wrap {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.12s;
  max-width: 260px;
}
.filename-wrap:hover { background: var(--hover); }
.filename-wrap input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  padding: 2px 0;
  min-width: 40px;
  width: auto;
  max-width: 180px;
  text-overflow: ellipsis;
}
.filename-wrap input:focus {
  background: var(--panel-2);
  border-radius: 3px;
  padding: 2px 6px;
}
.filename-ext {
  color: var(--text-faint);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.save-indicator {
  color: var(--text-faint);
  font-size: 9px;
  margin-left: 6px;
  opacity: 0;
  transition: opacity 0.3s;
}
.save-indicator.dirty { color: var(--accent); opacity: 1; }
.save-indicator.saved { color: #10b981; opacity: 1; }

.view-toggle {
  display: flex;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}
.view-btn {
  padding: 4px 10px;
  font-size: 12px;
  color: var(--text-dim);
  border-radius: 3px;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all 0.12s;
}
.view-btn:hover { color: var(--text); }
.view-btn.active {
  background: var(--active);
  color: var(--text);
}

.zoom-level {
  min-width: 54px;
  padding: 5px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  transition: all 0.12s;
}
.zoom-level:hover { background: var(--hover); }

.sep { width: 1px; height: 20px; background: var(--border); margin: 0 4px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 12px;
  font-weight: 500;
  transition: all 0.12s;
}
.btn:hover { background: var(--hover); border-color: var(--border-light); }
.btn:active { background: var(--active); }
.btn.small { padding: 5px 10px; font-size: 12px; }
.btn.large { padding: 9px 18px; font-size: 13px; }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost {
  background: transparent;
  border-color: transparent;
}
.btn.ghost:hover { background: var(--hover); }
.btn.ghost.active {
  background: rgba(59, 130, 246, 0.18);
  border-color: rgba(59, 130, 246, 0.45);
  color: #cfe0ff;
}

.icon-btn {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  transition: all 0.12s;
}
.icon-btn:hover { background: var(--hover); color: var(--text); }
.icon-btn.small { width: 22px; height: 22px; }

/* ================ CANVAS ================ */
#canvasWrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(45deg, #1a1b1d 25%, transparent 25%),
    linear-gradient(-45deg, #1a1b1d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1b1d 75%),
    linear-gradient(-45deg, transparent 75%, #1a1b1d 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, 10px 0px;
  background-color: #131416;
}

#canvasViewport {
  position: absolute;
  inset: 0;
  cursor: default;
  touch-action: none;
}
#canvasViewport.panning { cursor: grabbing; }
#canvasViewport.pan-ready { cursor: grab; }

#stage {
  width: 100%;
  height: 100%;
  user-select: none;
  -webkit-user-select: none;
}

#artboardBg { pointer-events: none; }
#artboardBorder { pointer-events: none; }

/* Shape cursor on hover */
.shape-node { cursor: move; transition: filter 0.1s; }
.shape-node[data-locked="true"] { cursor: default; }

/* Selection overlay */
#overlay { pointer-events: none; }
.sel-outline {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}
.sel-handle {
  fill: #fff;
  stroke: var(--accent);
  stroke-width: 1.5;
  pointer-events: all;
  cursor: nwse-resize;
  vector-effect: non-scaling-stroke;
}
.sel-handle[data-h="t"],
.sel-handle[data-h="b"] { cursor: ns-resize; }
.sel-handle[data-h="l"],
.sel-handle[data-h="r"] { cursor: ew-resize; }
.sel-handle[data-h="tl"],
.sel-handle[data-h="br"] { cursor: nwse-resize; }
.sel-handle[data-h="tr"],
.sel-handle[data-h="bl"] { cursor: nesw-resize; }
.rot-handle {
  fill: var(--accent);
  stroke: #fff;
  stroke-width: 1.5;
  cursor: grab;
  pointer-events: all;
}
.rot-line {
  stroke: var(--accent);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}

.tile-ghost {
  opacity: 0.3;
  pointer-events: none;
}

.sel-outline.sel-member {
  stroke: rgba(59, 130, 246, 0.55);
  stroke-width: 1;
  stroke-dasharray: 4 3;
}
.sel-outline.sel-group {
  stroke-dasharray: 5 3;
}
.marquee {
  fill: rgba(59, 130, 246, 0.12);
  stroke: rgba(59, 130, 246, 0.85);
  stroke-width: 1;
  stroke-dasharray: 4 3;
  pointer-events: none;
}

/* Randomize sub-bar */
.random-bar {
  height: 40px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 14px;
  flex-shrink: 0;
  overflow-x: auto;
}
.random-bar.hidden { display: none; }
.random-section {
  display: flex;
  align-items: center;
  gap: 10px;
}
.random-section .checkbox-label {
  font-size: 12px !important;
  color: var(--text) !important;
  font-weight: 500;
  white-space: nowrap;
}
.random-hint {
  font-size: 11px;
  color: var(--text-faint);
}
.range-pair {
  display: flex;
  align-items: center;
  gap: 4px;
}
.range-label {
  font-size: 10px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.range-sep {
  color: var(--text-faint);
  margin: 0 4px;
  font-size: 11px;
}
.random-bar .num {
  width: 56px;
  padding: 4px 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  outline: none;
  text-align: right;
}
.random-bar .num:focus { border-color: var(--accent); }
.link-btn {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-faint);
  cursor: pointer;
  transition: all 0.12s;
  flex-shrink: 0;
  margin: 0 2px;
  border: 1px solid transparent;
  background: none;
}
.link-btn:hover { color: var(--text); background: var(--hover); }
.link-btn.active {
  color: var(--accent);
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.3);
}
.random-spacer { flex: 1; }

/* Scrubbable inputs */
.scrub {
  cursor: ew-resize;
  -webkit-user-select: none;
  user-select: none;
}
.scrub:focus { cursor: text; }
.scrubbing { cursor: ew-resize !important; }
body.scrubbing, body.scrubbing * { cursor: ew-resize !important; }

#canvasHUD {
  position: absolute;
  bottom: 12px;
  left: 12px;
  display: flex;
  gap: 6px;
  pointer-events: none;
}
.hud-item {
  padding: 4px 10px;
  background: rgba(15, 15, 16, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  backdrop-filter: blur(8px);
}

/* ================ MODAL ================ */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal.hidden { display: none; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}
.modal-body {
  position: relative;
  width: min(880px, 92vw);
  max-height: 90vh;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-head {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.modal-head h2 { font-size: 15px; font-weight: 600; }
.modal-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0;
  overflow: hidden;
}
.export-preview {
  padding: 18px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 380px;
}
.preview-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}
.preview-frame {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(45deg, #1a1b1d 25%, transparent 25%),
    linear-gradient(-45deg, #1a1b1d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1b1d 75%),
    linear-gradient(-45deg, transparent 75%, #1a1b1d 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, 8px 0;
  background-color: #131416;
  border-radius: var(--radius-sm);
  overflow: hidden;
  padding: 14px;
}
.preview-frame svg, .preview-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.export-options {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
}

.seg {
  flex: 1;
  display: flex;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}
.seg-btn {
  flex: 1;
  padding: 5px 10px;
  font-size: 12px;
  color: var(--text-dim);
  border-radius: 3px;
  transition: all 0.1s;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.active { background: var(--active); color: var(--text); }

.export-actions {
  margin-top: 6px;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* ================ RESPONSIVE ================ */
@media (max-width: 900px) {
  :root { --sidebar-w: 240px; }
  .topbar-center { position: static; transform: none; }
  .view-btn span, .btn.small span { display: none; }
  .filename-wrap input { max-width: 100px; }
}
@media (max-width: 640px) {
  #sidebar {
    position: fixed;
    z-index: 50;
    height: 100%;
    box-shadow: var(--shadow);
  }
  .topbar-center { display: none; }
  .btn span { display: none; }
  .filename-wrap { display: none; }
  .modal-content { grid-template-columns: 1fr; }
  .export-preview { min-height: 200px; }
  #toggleSidebar { display: inline-flex; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #4a4c50; }