:root {
  --bg-0: #0f1115;
  --bg-1: #161a22;
  --bg-2: #1e242f;
  --bg-3: #272e3c;
  --fg-0: #e6e9ef;
  --fg-1: #9aa4b8;
  --accent: #6ea8ff;
  --accent-2: #4d8bff;
  --danger: #ff6b6b;
  --ok: #3ecf8e;
  --border: #2a3140;
  --shadow: 0 6px 22px rgba(0,0,0,.4);
  font-family: "Inter", system-ui, Segoe UI, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg-0); color: var(--fg-0); overflow: hidden; }
body { display: grid; grid-template-rows: auto 1fr auto; }

button, select, input[type=number] {
  background: var(--bg-2); color: var(--fg-0); border: 1px solid var(--border);
  border-radius: 6px; padding: 5px 9px; cursor: pointer; font: inherit;
}
button:hover { background: var(--bg-3); }
button.active { background: var(--accent-2); border-color: var(--accent); color: white; }
button.primary { background: var(--accent-2); border-color: var(--accent); color: white; }
input[type=range] { accent-color: var(--accent); }
input[type=color] { background: none; border: none; width: 32px; height: 32px; padding: 0; cursor: pointer; }
select { padding: 4px 6px; }
h3 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--fg-1); }

/* Topbar */
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 8px 14px;
  background: var(--bg-1); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.brand .logo { color: var(--accent); font-size: 20px; }
.toolbar { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.toolbar button { min-width: 34px; }
.toolbar .sep, .canvas-controls .sep { width: 1px; height: 22px; background: var(--border); margin: 0 6px; }
.toolbar .brush { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--fg-1); }
.toolbar .brush input { width: 80px; }
.file-actions { margin-left: auto; display: flex; gap: 6px; }

/* Workspace */
.workspace {
  display: grid;
  grid-template-columns: 240px 1fr 240px;
  min-height: 0;
  overflow: hidden;
}
.left-panel, .right-panel {
  background: var(--bg-1); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 10px; padding: 10px;
  overflow-y: auto;
}
.right-panel { border-right: none; border-left: 1px solid var(--border); }
.panel {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px; display: flex; flex-direction: column; gap: 8px;
}
.panel > header {
  display: flex; justify-content: space-between; align-items: center;
}
.panel > header .btns { display: flex; gap: 4px; }
.panel > header .btns button { padding: 3px 7px; font-size: 12px; }

/* Palette */
.palette-grid {
  display: grid; grid-template-columns: repeat(8, 1fr); gap: 3px;
  max-height: 160px; overflow-y: auto;
}
.palette-grid .swatch {
  aspect-ratio: 1; border: 2px solid transparent; border-radius: 3px; cursor: pointer;
  background-image: linear-gradient(45deg, #2a2a2a 25%, transparent 25%, transparent 75%, #2a2a2a 75%),
                    linear-gradient(45deg, #2a2a2a 25%, #1a1a1a 25%, #1a1a1a 75%, #2a2a2a 75%);
  background-size: 8px 8px; background-position: 0 0, 4px 4px;
}
.palette-grid .swatch.selected { border-color: var(--accent); transform: scale(1.05); }
.palette-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.palette-actions .color-pick { display: flex; align-items: center; gap: 4px; font-size: 12px; color: var(--fg-1); }
.color-slots { display: flex; gap: 6px; }
.color-slots .slot {
  width: 32px; height: 32px; border: 2px solid var(--border); border-radius: 4px;
}
.color-slots .primary { border-color: var(--accent); }

/* Layers */
.layer-list {
  list-style: none; padding: 0; margin: 0; max-height: 200px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 3px;
}
.layer-list li {
  display: flex; align-items: center; gap: 6px; padding: 5px 7px;
  background: var(--bg-3); border-radius: 4px; cursor: pointer; font-size: 12px;
  border: 1px solid transparent;
}
.layer-list li.active { border-color: var(--accent); background: #2d3a55; }
.layer-list .vis { cursor: pointer; width: 18px; text-align: center; user-select: none; }
.layer-list .name {
  flex: 1; background: transparent; border: none; color: inherit;
  font: inherit; padding: 2px; min-width: 0;
}
.layer-list .name:focus { outline: 1px solid var(--accent); background: var(--bg-0); }
.opacity { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--fg-1); }
.opacity input { flex: 1; }

/* Canvas area */
.canvas-area { display: flex; flex-direction: column; min-width: 0; background: var(--bg-0); }
.canvas-controls {
  display: flex; align-items: center; gap: 8px; padding: 6px 12px;
  border-bottom: 1px solid var(--border); font-size: 12px; color: var(--fg-1); background: var(--bg-1);
}
.canvas-controls .coord { margin-left: auto; font-family: monospace; }
.canvas-host {
  flex: 1; position: relative; overflow: hidden;
  background-image:
    linear-gradient(45deg, #1a1d25 25%, transparent 25%, transparent 75%, #1a1d25 75%),
    linear-gradient(45deg, #1a1d25 25%, #121419 25%, #121419 75%, #1a1d25 75%);
  background-size: 20px 20px; background-position: 0 0, 10px 10px;
  display: grid; place-items: center;
}
#mainCanvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: crosshair; box-shadow: var(--shadow);
  touch-action: none;
}

/* Right panel */
.preview-panel canvas {
  width: 100%; aspect-ratio: 1; background: #111;
  image-rendering: pixelated; image-rendering: crisp-edges;
  border: 1px solid var(--border); border-radius: 4px;
}
.playback { display: flex; align-items: center; justify-content: space-between; gap: 6px; font-size: 12px; color: var(--fg-1); }
.playback input { width: 50px; }
.info-panel .doc-info { font-size: 12px; color: var(--fg-1); display: flex; flex-direction: column; gap: 3px; }

/* Frames strip */
.frame-strip-wrap { background: var(--bg-1); border-top: 1px solid var(--border); padding: 8px 12px; }
.frames-panel { max-height: 160px; }
.frame-strip {
  list-style: none; padding: 0; margin: 0; display: flex; gap: 6px;
  overflow-x: auto; padding-bottom: 4px;
}
.frame-strip li {
  flex: 0 0 auto; width: 68px; background: var(--bg-3); border: 2px solid transparent;
  border-radius: 4px; padding: 4px; cursor: pointer; text-align: center; font-size: 11px;
}
.frame-strip li.active { border-color: var(--accent); }
.frame-strip canvas {
  width: 100%; aspect-ratio: 1; background: #111;
  image-rendering: pixelated; image-rendering: crisp-edges; display: block;
}
.frame-strip .idx { color: var(--fg-1); margin-top: 2px; }

/* Modals */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,.6);
  display: grid; place-items: center; z-index: 1000;
}
.modal.hidden { display: none; }
.modal-body {
  background: var(--bg-1); border: 1px solid var(--border); border-radius: 10px;
  padding: 20px; min-width: 320px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 10px;
}
.modal-body h3 { color: var(--fg-0); font-size: 15px; text-transform: none; letter-spacing: 0; }
.modal-body label { display: flex; justify-content: space-between; align-items: center; gap: 10px; font-size: 13px; }
.modal-body .warn { color: var(--fg-1); font-size: 12px; margin: 0; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 6px; }

/* Toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--bg-3); color: var(--fg-0); padding: 10px 18px;
  border: 1px solid var(--border); border-radius: 6px; box-shadow: var(--shadow);
  z-index: 2000; font-size: 13px;
}
.toast.hidden { display: none; }

/* Scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-1); }
::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #3a4357; }

/* ---------- Mobile ---------- */
/* Showcase iframes on phones are only ~375x400, so we stack everything
   vertically, collapse side panels into horizontal scrollable strips, and
   pump every touch target up to 44px. The right-hand preview/info panel is
   decorative on mobile and hides entirely below 480px. */
@media (max-width: 768px) {
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }
  .left-panel, .right-panel {
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--border);
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    max-height: 180px;
    min-width: 0;
    gap: 8px;
    padding: 8px;
  }
  .right-panel {
    border-top: 1px solid var(--border);
    border-bottom: none;
  }
  .panel {
    flex: 0 0 auto;
    min-width: 200px;
    max-height: 160px;
    overflow-y: auto;
  }
  .palette-panel { min-width: 220px; }
  .layers-panel  { min-width: 200px; }
  .topbar {
    flex-wrap: wrap;
    gap: 6px;
    padding: 6px 8px;
  }
  .toolbar { flex-wrap: wrap; }
  .file-actions { margin-left: 0; order: 3; flex-basis: 100%; }
  .toolbar button,
  .topbar button,
  .file-actions button,
  .canvas-controls button,
  .panel > header .btns button,
  .palette-actions button {
    min-height: 44px;
    min-width: 44px;
    font-size: 14px;
  }
  .toolbar .brush { min-height: 44px; }
  .toolbar .brush input { width: 100px; }
  select, input[type=number] { min-height: 40px; font-size: 14px; }
  .palette-grid { grid-template-columns: repeat(8, 28px); max-height: 120px; }
  .palette-grid .swatch { min-height: 28px; min-width: 28px; }
  .color-slots .slot { width: 44px; height: 44px; }
  .layer-list li { min-height: 44px; }
  #mainCanvas {
    max-width: 100%;
    max-height: 50vh;
    height: auto;
  }
  .canvas-host { padding: 8px; }
  .frame-strip li { width: 60px; min-height: 72px; }
  .frame-strip li .idx { font-size: 11px; }
  .preview-panel canvas { max-height: 100px; }
}

@media (max-width: 480px) {
  .left-panel, .right-panel {
    max-height: 140px;
    padding: 6px;
  }
  .right-panel { display: none; } /* preview panel is decorative on tiny screens */
  .panel { min-width: 180px; padding: 6px; gap: 6px; }
  .palette-panel { min-width: 200px; }
  .topbar { padding: 4px 6px; gap: 4px; }
  .brand { font-size: 12px; }
  .brand span:not(.logo) { display: none; }
  .toolbar button,
  .file-actions button,
  .canvas-controls button {
    min-height: 44px;
    min-width: 44px;
    padding: 6px 8px;
    font-size: 13px;
  }
  .toolbar .brush span { display: none; }
  .canvas-controls { flex-wrap: wrap; gap: 6px; padding: 6px; font-size: 11px; }
  .canvas-controls .coord { margin-left: 0; }
  .palette-grid { grid-template-columns: repeat(6, 28px); }
  #mainCanvas { max-height: 40vh; }
  .frame-strip-wrap { padding: 6px; }
  .frames-panel { max-height: 130px; padding: 6px; }
  .frame-strip li { width: 50px; min-height: 64px; font-size: 10px; }
  .layer-list { max-height: 120px; }
  .doc-info { font-size: 11px; }
  .modal-body { min-width: 280px; padding: 14px; }
  .modal-body label { font-size: 12px; }
  .modal-body button { min-height: 44px; }
}