:root {
  --bg: #f6efe5;
  --panel: rgba(255, 250, 244, 0.88);
  --text: #1b1b18;
  --muted: #716b61;
  --line: rgba(48, 43, 36, 0.12);
  --accent: #c85c33;
  --accent-dark: #9f4321;
  --shadow: 0 20px 60px rgba(68, 39, 21, 0.12);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fff7ee 0%, var(--bg) 100%);
  min-height: 100vh;
}
button, input { font: inherit; }
.page-shell { width: min(1240px, calc(100vw - 32px)); margin: 0 auto; padding: 28px 0 40px; }
.hero { display: flex; justify-content: space-between; gap: 24px; align-items: flex-start; margin-bottom: 24px; }
h1 { margin: 0; font-size: clamp(36px, 5vw, 64px); line-height: 0.95; }
.hero-copy { width: min(640px, 100%); margin: 16px 0 0; font-size: 16px; line-height: 1.65; color: var(--muted); }
.status-card, .panel { background: var(--panel); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.status-card { min-width: 280px; padding: 18px; }
.status-pill { display: inline-flex; align-items: center; padding: 8px 12px; border-radius: 999px; font-size: 13px; font-weight: 700; color: #18794e; background: rgba(24,121,78,0.14); }
#hint-text { margin: 12px 0 0; color: var(--muted); line-height: 1.5; }
.layout { display: grid; grid-template-columns: 320px 1fr; gap: 20px; }
.controls, .workspace { padding: 20px; }
.controls { display: flex; flex-direction: column; gap: 18px; }
.upload-card { display: flex; flex-direction: column; gap: 6px; padding: 18px; border-radius: 18px; border: 1px dashed rgba(200,92,51,0.35); background: linear-gradient(180deg, rgba(200,92,51,0.08), rgba(200,92,51,0.03)); cursor: pointer; }
.upload-card input { display: none; }
.upload-title { font-weight: 700; }
.upload-subtitle, .notes, .control-group label, .canvas-header span { color: var(--muted); }
.control-group { display: flex; flex-direction: column; gap: 8px; }
.control-group input[type="range"] { width: 100%; }
.debug-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}
.actions { display: flex; flex-direction: column; gap: 10px; }
.button { padding: 12px 16px; border: 0; border-radius: 14px; cursor: pointer; }
.button:disabled { opacity: 0.45; cursor: not-allowed; }
.button.primary { color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-dark)); }
.button.secondary { background: rgba(31,27,24,0.08); }
.button.ghost { background: transparent; border: 1px solid var(--line); }
.notes { font-size: 14px; line-height: 1.55; }
.debug-panel {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: rgba(31,27,24,0.05);
  border: 1px solid rgba(48,43,36,0.12);
}
.debug-panel.hidden { display: none; }
.debug-title {
  margin: 0 0 8px;
  font-weight: 600;
  color: var(--text);
}
#debug-text {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}
.workspace { display: block; }
.canvas-card { display: flex; flex-direction: column; min-height: 560px; overflow: hidden; border-radius: 20px; background: rgba(255,255,255,0.66); border: 1px solid var(--line); }
.canvas-card-single { min-height: 720px; }
.canvas-header { display: flex; justify-content: space-between; gap: 12px; align-items: center; padding: 16px 18px 14px; border-bottom: 1px solid var(--line); }
.canvas-header h2 { margin: 0; font-size: 18px; }
.canvas-shell {
  position: relative;
  display: grid;
  place-items: center;
  flex: 1;
  padding: 14px;
  background-image:
    linear-gradient(45deg, rgba(0, 0, 0, 0.03) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0, 0, 0, 0.03) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0, 0, 0, 0.03) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0, 0, 0, 0.03) 75%);
  background-size: 20px 20px;
}
.canvas-shell-uploadable { cursor: crosshair; }
.canvas-shell-uploadable.drag-over { outline: 2px dashed rgba(200,92,51,0.8); outline-offset: -10px; background-color: rgba(200,92,51,0.08); }
.empty-state {
  position: absolute;
  inset: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed rgba(48,43,36,0.16);
  border-radius: 14px;
  pointer-events: none;
}
.empty-state.hidden { display: none; }
.brush-indicator {
  position: absolute;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid rgba(200,92,51,0.95);
  background: rgba(200,92,51,0.14);
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
}
.brush-indicator.visible { opacity: 1; }
canvas { max-width: 100%; max-height: 100%; border-radius: 14px; box-shadow: 0 12px 30px rgba(31,27,24,0.12); }
.result-overlay {
  position: absolute;
  inset: 14px;
  width: calc(100% - 28px);
  height: calc(100% - 28px);
  opacity: 0;
  pointer-events: none;
}
.result-overlay.visible { opacity: 1; }
.result-overlay.animating { animation: revealResult 720ms ease forwards; }
.wipe-highlight {
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 0;
  width: 120px;
  opacity: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,0.82), rgba(255,255,255,0));
  transform: translateX(-140px);
}
.wipe-highlight.animating {
  opacity: 1;
  animation: wipePass 720ms ease forwards;
}
.viewer-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
@keyframes revealResult {
  from {
    clip-path: inset(0 100% 0 0);
    opacity: 1;
  }
  to {
    clip-path: inset(0 0 0 0);
    opacity: 1;
  }
}
@keyframes wipePass {
  from { transform: translateX(-140px); }
  to { transform: translateX(calc(100% + 140px)); }
}
@media (max-width: 1040px) {
  .layout, .hero { grid-template-columns: 1fr; flex-direction: column; }
  .status-card { width: 100%; }
  .canvas-card { min-height: 420px; }
  .canvas-card-single { min-height: 520px; }
}