:root {
  --ink: #16171b;
  --panel: #1f2128;
  --panel-2: #24262e;
  --paper: #f3f1ea;
  --muted: #8b8d97;
  --safelight: #ff7a30;
  --safelight-dim: #ff7a3022;
  --develop: #35c9a5;
  --develop-dim: #35c9a522;
  --hairline: #33353d;
  --danger: #e5555b;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius: 3px;
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

:focus-visible {
  outline: 2px solid var(--safelight);
  outline-offset: 2px;
}

/* ---------- signature film-rail edge ---------- */
.filmrail {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 6px;
  z-index: 50;
  background-image: radial-gradient(circle, var(--panel-2) 2px, transparent 2.2px);
  background-size: 16px 6px;
  background-color: var(--ink);
  border-bottom: 1px solid var(--hairline);
}

/* ---------- header ---------- */
.site-header {
  padding: 40px 24px 12px;
  text-align: center;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 40px);
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.sprocket-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--safelight);
  box-shadow: 0 0 14px 2px var(--safelight-dim);
}

.tagline {
  margin: 6px 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.hidden { display: none !important; }

/* ---------- sprocket hole strips ---------- */
.sprockets {
  height: 14px;
  background-image: radial-gradient(circle, var(--ink) 3px, transparent 3.2px);
  background-size: 22px 14px;
  background-position: 8px center;
  background-color: var(--panel-2);
}
.sprockets-top { border-radius: var(--radius) var(--radius) 0 0; }
.sprockets-bottom { border-radius: 0 0 var(--radius) var(--radius); }

/* ---------- dropzone ---------- */
.dropzone { display: block; cursor: pointer; }

.dropzone-frame {
  background: var(--panel-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover .dropzone-frame,
.dropzone:focus-visible .dropzone-frame,
.dropzone-frame.drag-over {
  border-color: var(--safelight);
  background: #292b34;
}

.dropzone-inner {
  padding: 72px 24px;
  text-align: center;
  color: var(--muted);
}

.dropzone-inner svg { color: var(--safelight); margin-bottom: 14px; }

.drop-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  color: var(--paper);
  margin: 0 0 6px;
}

.drop-sub { margin: 0 0 4px; font-size: 14.5px; }

.drop-note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--develop);
}

/* ---------- bench layout ---------- */
.bench {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: start;
}

@media (max-width: 860px) {
  .bench { grid-template-columns: 1fr; }
}

.preview-col { position: sticky; top: 20px; }

.preview-frame {
  background: var(--panel-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-surface {
  position: relative;
  min-height: 260px;
  max-height: 70vh;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background-image:
    linear-gradient(45deg, #2a2c34 25%, transparent 25%),
    linear-gradient(-45deg, #2a2c34 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2a2c34 75%),
    linear-gradient(-45deg, transparent 75%, #2a2c34 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  background-color: var(--panel);
}

#viewCanvas {
  max-width: 100%;
  max-height: 60vh;
  display: block;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}

.busy-overlay {
  position: absolute; inset: 0;
  background: rgba(22, 23, 27, 0.86);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 10px;
  text-align: center;
  padding: 16px;
}

.busy-spinner {
  width: 26px; height: 26px;
  border: 2.5px solid var(--hairline);
  border-top-color: var(--safelight);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.busy-overlay p { font-family: var(--font-mono); font-size: 13px; color: var(--paper); margin: 0; }

.busy-bar {
  width: 160px; height: 3px;
  background: var(--hairline);
  border-radius: 2px;
  overflow: hidden;
}
.busy-fill {
  height: 100%; width: 12%;
  background: var(--safelight);
  transition: width 0.2s ease;
}

/* ---------- readout ---------- */
.readout {
  margin: 14px 2px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 0;
}
.readout > div {
  border-top: 1px solid var(--hairline);
  padding-top: 8px;
}
.readout dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 3px;
}
.readout dd {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--paper);
  margin: 0;
  overflow-wrap: anywhere;
}
@media (max-width: 520px) {
  .readout { grid-template-columns: repeat(2, 1fr); }
}

.ghost-btn {
  margin-top: 16px;
  background: none;
  border: 1px solid var(--hairline);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 9px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.ghost-btn:hover { border-color: var(--paper); color: var(--paper); }

/* ---------- tool rail ---------- */
.rail { display: flex; flex-direction: column; gap: 16px; }

.tool-card {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 18px 20px 20px;
}

.tool-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.tool-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--safelight);
  border: 1px solid var(--safelight-dim);
  padding: 2px 6px;
  border-radius: 2px;
}

.tool-head h2 {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 600;
  margin: 0;
  flex: 1;
}

.tool-status {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 3px 8px;
  border-radius: 10px;
  border: 1px solid var(--hairline);
}
.tool-status.working { color: var(--safelight); border-color: var(--safelight-dim); }
.tool-status.done { color: var(--develop); border-color: var(--develop-dim); }
.tool-status.error { color: var(--danger); border-color: #e5555b33; }

.tool-desc {
  color: var(--muted);
  font-size: 13.5px;
  margin: 0 0 14px;
  line-height: 1.55;
}

.primary-btn {
  width: 100%;
  background: var(--safelight);
  color: #1b0f04;
  border: none;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 11px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.05s ease;
}
.primary-btn:hover { filter: brightness(1.08); }
.primary-btn:active { transform: translateY(1px); }
.primary-btn:disabled { opacity: 0.45; cursor: not-allowed; filter: none; }

.field-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
}
.field-row input[type="range"] { flex: 1; accent-color: var(--safelight); }
.mono-val { color: var(--paper); width: 22px; text-align: right; }

.scale-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}
.scale-btn {
  background: var(--panel-2);
  border: 1px solid var(--hairline);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 4px 8px;
  border-radius: var(--radius);
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  transition: border-color 0.15s ease;
}
.scale-btn span {
  font-size: 8.5px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.scale-btn:hover { border-color: var(--safelight); }
.scale-btn.active { border-color: var(--develop); color: var(--develop); }
.scale-btn.active span { color: var(--develop); }
.scale-btn:disabled { opacity: 0.4; cursor: not-allowed; }

@media (max-width: 420px) {
  .scale-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- export bar ---------- */
.export-bar {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  border-top: 1px solid var(--hairline);
  padding-top: 18px;
}

.export-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-right: 4px;
}

.export-btn {
  background: var(--develop);
  color: #06231c;
  border: none;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13.5px;
  padding: 10px 16px;
  border-radius: var(--radius);
  cursor: pointer;
}
.export-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.export-btn.ghost {
  background: none;
  border: 1px solid var(--hairline);
  color: var(--muted);
}
.export-btn.ghost:hover { color: var(--paper); border-color: var(--paper); }

/* ---------- footer ---------- */
.site-footer {
  text-align: center;
  padding: 20px 24px 50px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
}

/* ============================================================
   Header controls: fast-mode toggle + single/batch switch
============================================================ */
.header-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  position: relative;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 14px;
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
}

@media (max-width: 780px) {
  .header-controls { position: static; transform: none; margin-top: 14px; }
}

.fast-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}
.fast-toggle input { accent-color: var(--safelight); }
.fast-toggle:has(input:checked) { color: var(--safelight); }

.mode-switch {
  display: inline-flex;
  border: 1px solid var(--hairline);
  border-radius: 20px;
  overflow: hidden;
}
.mode-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 7px 14px;
  cursor: pointer;
}
.mode-btn.active { background: var(--safelight); color: #1b0f04; font-weight: 600; }

/* ============================================================
   Preview toolbar: background swatches + undo/redo
============================================================ */
.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--hairline);
}

.bg-toggle, .history-controls { display: flex; gap: 4px; }

.bg-swatch, .icon-btn {
  width: 26px; height: 26px;
  border-radius: 3px;
  border: 1px solid var(--hairline);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.bg-swatch.active { border-color: var(--safelight); color: var(--safelight); }
.icon-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.icon-btn:not(:disabled):hover { border-color: var(--paper); color: var(--paper); }

.preview-surface.bg-checker {
  background-image:
    linear-gradient(45deg, #2a2c34 25%, transparent 25%),
    linear-gradient(-45deg, #2a2c34 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2a2c34 75%),
    linear-gradient(-45deg, transparent 75%, #2a2c34 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  background-color: var(--panel);
}
.preview-surface.bg-white { background: #ffffff; }
.preview-surface.bg-black { background: #000000; }

#svgPreviewImg {
  max-width: 100%;
  max-height: 60vh;
  display: block;
}

.view-toggle {
  display: inline-flex;
  margin-top: 12px;
  border: 1px solid var(--hairline);
  border-radius: 20px;
  overflow: hidden;
}
.view-toggle-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 14px;
  cursor: pointer;
}
.view-toggle-btn.active { background: var(--develop); color: #06231c; font-weight: 600; }

/* ============================================================
   Export bar additions
============================================================ */
.format-select {
  background: var(--panel-2);
  border: 1px solid var(--hairline);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 9px 10px;
  border-radius: var(--radius);
}

/* ============================================================
   Batch mode
============================================================ */
.batch-panel { margin-top: 24px; }

.batch-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.batch-controls label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
}
.batch-run-btn { width: auto; padding: 10px 18px; }

.batch-list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex; flex-direction: column;
  gap: 8px;
}
.batch-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 8px 12px;
}
.batch-item img {
  width: 40px; height: 40px;
  object-fit: cover;
  border-radius: 2px;
  background-image:
    linear-gradient(45deg, #2a2c34 25%, transparent 25%),
    linear-gradient(-45deg, #2a2c34 25%, transparent 25%);
  background-size: 8px 8px;
}
.batch-item .b-name {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 12.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.batch-item .b-status {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 3px 8px;
  border-radius: 10px;
  border: 1px solid var(--hairline);
  white-space: nowrap;
}
.batch-item .b-status.working { color: var(--safelight); border-color: var(--safelight-dim); }
.batch-item .b-status.done { color: var(--develop); border-color: var(--develop-dim); }
.batch-item .b-status.error { color: var(--danger); border-color: #e5555b33; }

/* ============================================================
   Footer clear-cache control
============================================================ */
.footer-ghost {
  margin-top: 10px;
  font-size: 11.5px;
}

/* ============================================================
   Round 2 additions: transforms, zoom, compare, presets, export bg
============================================================ */

.preview-toolbar {
  flex-wrap: wrap;
  gap: 10px;
  row-gap: 8px;
}

.transform-controls, .zoom-controls { display: flex; align-items: center; gap: 4px; }

.zoom-label {
  min-width: 40px;
  text-align: center;
  font-size: 11px;
}

.drop-note-muted { color: var(--muted) !important; font-size: 11px !important; }

/* ---- compare slider ---- */
.compare-wrap {
  position: relative;
  width: 100%;
  max-width: 640px;
  max-height: 60vh;
}
.compare-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}
#compareOriginal { clip-path: inset(0 50% 0 0); }
.compare-slider {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  cursor: ew-resize;
}
.compare-slider::-webkit-slider-runnable-track { background: transparent; }
.compare-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 3px;
  height: 100%;
  background: var(--safelight);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.4), 0 0 8px var(--safelight);
  cursor: ew-resize;
  border-radius: 0;
}
.compare-slider::-moz-range-track { background: transparent; height: 100%; }
.compare-slider::-moz-range-thumb {
  width: 3px;
  height: 100%;
  background: var(--safelight);
  border: none;
  border-radius: 0;
  cursor: ew-resize;
}

/* ---- vectorize presets ---- */
.preset-row { display: flex; gap: 6px; margin-bottom: 10px; }
.preset-btn {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--hairline);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 7px 4px;
  border-radius: var(--radius);
  cursor: pointer;
}
.preset-btn:hover { border-color: var(--safelight); color: var(--paper); }

/* ---- export background + zip-original checkbox ---- */
.color-swatch {
  width: 36px; height: 36px;
  padding: 2px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--panel-2);
  cursor: pointer;
}
.zip-original-check {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}
.zip-original-check input { accent-color: var(--develop); }

/* ---- batch item remove button ---- */
.batch-item .b-remove {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
}
.batch-item .b-remove:hover { color: var(--danger); }

/* ---- canvas zoom wrapper ---- */
#viewCanvas, #svgPreviewImg { transition: transform 0.1s ease; }

@media (max-width: 640px) {
  .preview-toolbar { justify-content: center; }
}

.view-toggle-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.batch-progress {
  font-size: 12px;
  color: var(--muted);
  min-width: 40px;
}