:root {
  --bg: #1b1d24;
  --panel: #24262f;
  --border: #383b47;
  --text: #e6e6ec;
  --muted: #9a9db0;
  --accent: #6daa2c;
  --accent2: #597dce;
  --danger: #d04648;
  --warn: #d27d2c;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  display: flex;
  flex-direction: column;
}

header {
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex: 0 0 auto;
}
.header-logo { height: 28px; width: auto; flex: 0 0 auto; }
header h1 { font-size: 15px; font-weight: normal; margin: 0; letter-spacing: 0.3px; color: var(--muted); }
header h1 b { font-size: 20px; letter-spacing: 1px; color: var(--text); }

.projects-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  padding: 8px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}
.projects-toolbar #currentProjectName { width: 160px; }
.projects-toolbar #savedProjectsSelect { max-width: 200px; }
.toolbar-sep { width: 1px; align-self: stretch; background: var(--border); margin: 0 4px; }

.layout {
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
}

.panel {
  background: var(--panel);
  padding: 14px;
  overflow-y: auto;
}
.left-panel { flex: 0 0 260px; width: 260px; border-right: 1px solid var(--border); }

.resizer {
  flex: 0 0 5px;
  width: 5px;
  cursor: col-resize;
  background: transparent;
}
.resizer:hover, .resizer:active { background: var(--accent2); }

section { margin-bottom: 20px; }
h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); margin: 0 0 8px; }

.row {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.row label { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 4px; }
.row input[type=number] { width: 56px; }

input, textarea, select {
  background: #14151a;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px;
  padding: 4px 6px;
  font-size: 13px;
}
textarea { width: 100%; resize: vertical; font-family: monospace; font-size: 11px; }

button {
  background: #2f313d;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 13px;
}
button:hover { background: #3a3d4a; }
button.wide { flex: 1; }
button.primary { background: var(--accent2); border-color: var(--accent2); color: white; }
button.primary:hover { filter: brightness(1.1); }
button.danger { background: #4a2626; border-color: var(--danger); color: #ffb3b3; }
button.warn { background: #4a3826; border-color: var(--warn); color: #ffd9a8; }

.presets { flex-wrap: wrap; }
.presets button { flex: 1 0 30%; font-size: 12px; padding: 4px; }

.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 8px; }
.tool.active { background: var(--accent2); border-color: var(--accent2); color: white; }

.checkbox { user-select: none; }

.palette {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}
.swatch {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 3px;
  border: 1px solid #00000055;
  cursor: pointer;
}
.swatch.selected { outline: 2px solid white; outline-offset: 1px; }
.small-label { color: var(--muted); font-size: 11px; width: 100%; }

.center-panel {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-width: 0;
  padding: 14px;
  overflow: hidden;
  height: 100%;
}
.doc-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 0 0 auto;
  margin-bottom: 8px;
  overflow-x: auto;
}
.doc-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #2f313d;
  border: 1px solid var(--border);
  border-radius: 4px 4px 0 0;
  padding: 5px 8px;
  cursor: pointer;
  font-size: 12px;
  flex: 0 0 auto;
  max-width: 160px;
}
.doc-tab:hover { background: #3a3d4a; }
.doc-tab.active { background: var(--accent2); border-color: var(--accent2); color: white; }
.doc-tab-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-tab-close {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0 2px;
  font-size: 11px;
  cursor: pointer;
  line-height: 1;
  opacity: 0.7;
}
.doc-tab-close:hover { opacity: 1; background: transparent; }
.doc-tab-add {
  flex: 0 0 auto;
  padding: 5px 10px;
  font-size: 13px;
}
.doc-tab-export-all {
  flex: 0 0 auto;
  padding: 5px 10px;
  font-size: 12px;
  margin-left: auto;
}
.canvas-toolbar { margin-bottom: 8px; color: var(--muted); font-size: 13px; flex: 0 0 auto; }
.canvas-viewport {
  flex: 1;
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #111;
  padding: 20px;
}
.canvas-stage {
  position: relative;
  display: inline-block;
  line-height: 0;
  background-image:
    linear-gradient(45deg, #333 25%, transparent 25%),
    linear-gradient(-45deg, #333 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #333 75%),
    linear-gradient(-45deg, transparent 75%, #333 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: #555;
}
#pixelCanvas { display: block; image-rendering: pixelated; cursor: crosshair; touch-action: none; position: relative; z-index: 1; }
.grid-overlay { position: absolute; top: 0; left: 0; pointer-events: none; z-index: 2; }

.hint { font-size: 11px; color: var(--muted); line-height: 1.4; }
.hint code { display: block; background: #14151a; padding: 3px 5px; border-radius: 3px; margin-top: 3px; word-break: break-all; }

.section-gap { margin-top: 20px; }

.layer-list { list-style: none; margin: 10px 0 0; padding: 0; max-height: 260px; overflow-y: auto; }
.layer-item {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  margin-bottom: 6px;
  font-size: 12px;
}
.layer-item.active { border-color: var(--accent2); background: #2a2f42; }
.layer-row1 { display: flex; align-items: center; gap: 2px; margin-bottom: 4px; }
.layer-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; padding: 0 2px; }
.layer-row2 { display: flex; align-items: center; gap: 6px; }
.layer-row2 input[type=range] { flex: 1; min-width: 0; }
.layer-list { overflow-x: hidden; }
.opacity-val { color: var(--muted); width: 34px; text-align: right; flex-shrink: 0; }
.mini-btn, .eye-btn {
  background: #2f313d;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 2px 4px;
  font-size: 10px;
  cursor: pointer;
  line-height: 1.4;
  flex-shrink: 0;
}
.mini-btn:hover, .eye-btn:hover { background: #3a3d4a; }
.mini-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.mini-btn.danger { color: #ffb3b3; }

.naming-row { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; }
.naming-row .small-label { width: 60px; flex-shrink: 0; }
.naming-row input[type=text] { flex: 1; min-width: 0; }

.variant-list { list-style: none; margin: 0 0 8px; padding: 0; }
.variant-row {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  margin-bottom: 6px;
  font-size: 12px;
}
.variant-row-main { display: flex; align-items: center; gap: 6px; }
.variant-row-main .variant-name { flex: 1; min-width: 0; }
.variant-row-main .checkbox { flex: 0 0 auto; white-space: nowrap; }
.variant-row-colors { display: flex; gap: 10px; margin-top: 6px; }
.variant-color-field { flex: 1; font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 4px; }

.color-swatch-btn {
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 4px;
  border: 1px solid var(--border);
  cursor: pointer;
  flex: 0 0 auto;
}
.color-swatch-btn:hover { border-color: var(--accent2); }

/* ---------- shared color popover (palette + recent + custom + eyedropper) ---------- */
.color-popover {
  position: fixed;
  z-index: 60;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  width: 200px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.color-popover .palette { margin-bottom: 6px; }
.popover-custom-row { align-items: center; margin: 4px 0 0; }
.popover-custom-row input[type=color] { width: 32px; height: 24px; padding: 2px; flex: 0 0 auto; }

.chip {
  background: #2f313d;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 11px;
  cursor: pointer;
}
.chip:hover { background: #3a3d4a; color: var(--text); }
.chip.active { background: var(--accent2); border-color: var(--accent2); color: white; }

/* ---------- export & naming (collapsible, pinned to bottom of left menu) ---------- */
.right-panel-body { padding-top: 8px; }
.right-panel-body.collapsed { display: none; }
.export-panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  cursor: pointer;
  user-select: none;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}
.export-panel-header:hover { color: var(--text); }

/* shared collapsible-panel header bits (also used by the bottom frame panel) */
.frame-panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  cursor: pointer;
  user-select: none;
  flex: 0 0 auto;
}
.frame-panel-header:hover { background: #2a2c36; }
.panel-caret { color: var(--muted); font-size: 11px; transition: transform 0.15s ease; }
.panel-caret.collapsed { transform: rotate(-90deg); }
.panel-title { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }

/* ---------- animation timeline (bottom panel) ---------- */
.frame-panel {
  flex: 0 0 auto;
  background: var(--panel);
  border-top: 1px solid var(--border);
}
.frame-panel-resizer {
  height: 5px;
  cursor: row-resize;
  background: transparent;
}
.frame-panel-resizer:hover, .frame-panel-resizer:active { background: var(--accent2); }
.frame-panel.collapsed .frame-panel-resizer { display: none; }
.frame-panel.collapsed .panel-caret { transform: rotate(-90deg); }
.frame-panel-summary { color: var(--muted); font-size: 12px; margin-left: auto; }

.frame-panel-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 16px 16px;
  max-height: 260px;
  overflow-y: auto;
}
.frame-panel.collapsed .frame-panel-body { display: none; }
.frame-panel-body > .hint, .frame-panel-body > #exportAnimationSection { flex-shrink: 0; }

.frame-strip-toolbar { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; flex-shrink: 0; }
.frame-strip-toolbar .spacer { flex: 1; }
.frame-strip-toolbar input[type=number] { width: 48px; }
.frame-strip-toolbar label.small-label { width: auto; flex: 0 0 auto; }

.frame-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 6px;
  flex-shrink: 0;
}
.frame-thumb {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  background: #14151a;
}
.frame-thumb:hover { border-color: var(--accent2); }
.frame-thumb.active { border-color: var(--accent2); background: #2a2f42; }
.frame-thumb-canvas {
  width: 48px;
  height: 48px;
  image-rendering: pixelated;
  background-image:
    linear-gradient(45deg, #333 25%, transparent 25%),
    linear-gradient(-45deg, #333 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #333 75%),
    linear-gradient(-45deg, transparent 75%, #333 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
  background-color: #555;
}
.frame-thumb-label { font-size: 10px; color: var(--muted); }

/* ---------- modal (replaces native confirm/alert/prompt) ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-overlay[hidden] { display: none; }
.modal-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px;
  width: 320px;
  max-width: calc(100vw - 40px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}
.modal-message { margin: 0 0 12px; font-size: 13px; line-height: 1.4; white-space: pre-line; }
.modal-input-row { margin-bottom: 12px; }
.modal-input-row input { width: 100%; }
.modal-buttons { display: flex; justify-content: flex-end; gap: 8px; }