:root {
  color-scheme: dark;
  --bg: #0b0e14;
  --bg-elevated: #121620;
  --bg-elevated-2: #1a2030;
  --border: #262d3d;
  --text: #e8ecf4;
  --text-dim: #8b93a7;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --accent-text: #04121a;
  --danger: #f87171;
  --success: #34d399;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --checker-a: #22262f;
  --checker-b: #17191f;
  --body-glow: #16203a;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6fb;
  --bg-elevated: #ffffff;
  --bg-elevated-2: #eef1f8;
  --border: #dbe1ee;
  --text: #101425;
  --text-dim: #616a80;
  --accent: #0ea5e9;
  --accent-hover: #0284c7;
  --accent-text: #ffffff;
  --danger: #dc2626;
  --success: #16a34a;
  --shadow: 0 10px 30px rgba(30,41,59,0.12);
  --checker-a: #e3e7f0;
  --checker-b: #f4f6fb;
  --body-glow: #dbe7ff;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: radial-gradient(1200px 600px at 50% -10%, var(--body-glow) 0%, var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color .2s ease, color .2s ease;
}

a { color: inherit; }

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px clamp(16px, 4vw, 48px);
  background: linear-gradient(110deg, #f59e0b 0%, #fbbf24 35%, #facc15 72%, #fde047 100%);
  box-shadow: 0 4px 24px rgba(202, 138, 4, 0.35);
  border-bottom: 1px solid color-mix(in srgb, #f59e0b 45%, transparent);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: #1c1305;
}

.brand-icon { font-size: 1.2rem; }

.navlinks {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.9rem;
  color: rgba(28, 19, 5, 0.75);
}
.navlinks a { text-decoration: none; }
.navlinks a:hover { color: #1c1305; }

.nav-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.privacy-pill {
  font-size: 0.78rem;
  color: #1c1305;
  background: rgba(28, 19, 5, 0.1);
  border: 1px solid rgba(28, 19, 5, 0.18);
  padding: 5px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid rgba(28, 19, 5, 0.18);
  background: rgba(28, 19, 5, 0.1);
  color: #1c1305;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background .15s ease, transform .08s ease;
}
.icon-btn:hover { background: rgba(28, 19, 5, 0.18); }
.icon-btn:active { transform: translateY(1px); }

@media (max-width: 560px) {
  .navbar { gap: 10px; padding: 12px 14px; }
  .privacy-pill { display: none; }
  .navlinks { gap: 12px; font-size: 0.84rem; }
}

/* ---------- Main layout ---------- */
#app {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 10px clamp(16px, 4vw, 48px) 32px;
}

.screen { flex: 1; display: flex; flex-direction: column; }

/* ---------- Upload screen ---------- */
#upload-screen {
  align-items: stretch;
  gap: 56px;
  padding: 32px 0 48px;
}

.upload-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.dropzone {
  width: min(680px, 92vw);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  padding: clamp(28px, 6vw, 56px) 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, transform .1s ease;
}

.dropzone:hover, .dropzone:focus-visible {
  border-color: var(--accent);
  background: var(--bg-elevated-2);
  outline: none;
}

.dropzone.is-dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated));
  transform: scale(1.01);
}

.dropzone-inner { display: flex; flex-direction: column; align-items: center; gap: 6px; }

.upload-icon { color: var(--accent); margin-bottom: 8px; }

.dropzone h1 { font-size: 1.4rem; margin: 4px 0 0; }
.dropzone p { color: var(--text-dim); margin: 0 0 14px; font-size: 0.92rem; }

.error-text {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 0.9rem;
  max-width: 500px;
  text-align: center;
}

/* ---------- Showcase section ---------- */
.showcase-section {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
}
.showcase-section h2 { font-size: 1.3rem; margin: 0 0 8px; }
.showcase-sub {
  color: var(--text-dim);
  font-size: 0.92rem;
  max-width: 640px;
  margin: 0 auto 26px;
  line-height: 1.5;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.showcase-card {
  margin: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.showcase-pair {
  display: flex;
  align-items: center;
  gap: 8px;
}

.showcase-img-wrap {
  position: relative;
  flex: 1;
  aspect-ratio: 4 / 5;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-elevated-2);
}
.showcase-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.showcase-img-wrap.showcase-checker {
  background:
    linear-gradient(45deg, var(--checker-a) 25%, transparent 25%) 0 0/16px 16px,
    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%) 0 0/16px 16px,
    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%) 0 0/16px 16px,
    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%) 0 0/16px 16px,
    var(--checker-b);
}

.showcase-tag {
  position: absolute;
  bottom: 6px;
  left: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.55);
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}
.showcase-tag-accent {
  background: var(--accent);
  color: var(--accent-text);
}

.showcase-arrow {
  flex: 0 0 auto;
  color: var(--text-dim);
  font-size: 1.1rem;
}

.showcase-card figcaption {
  margin-top: 12px;
  font-size: 0.84rem;
  color: var(--text-dim);
}

@media (max-width: 480px) {
  .showcase-pair { gap: 4px; }
  .showcase-arrow { font-size: 0.9rem; }
}

/* ---------- Features section ---------- */
.features-section {
  max-width: 1040px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
}
.features-section h2 {
  font-size: 1.3rem;
  margin: 0 0 24px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  text-align: left;
}
.feature-emoji { font-size: 1.6rem; }
.feature-card h3 { font-size: 1rem; margin: 10px 0 6px; }
.feature-card p { font-size: 0.86rem; color: var(--text-dim); margin: 0; line-height: 1.45; }

/* ---------- Buttons ---------- */
.btn {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 10px 18px;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, opacity .15s ease, transform .05s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover:not(:disabled) { background: var(--bg-elevated-2); }
.btn-ghost.is-active { border-color: var(--accent); color: var(--accent); }

.btn-block { width: 100%; justify-content: center; }

/* ---------- Thumbnail strip ---------- */
.thumbnail-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 2px 14px;
  margin-bottom: 4px;
}
.thumbnail-strip:empty { display: none; }

.thumb {
  position: relative;
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--bg-elevated-2);
  cursor: pointer;
  overflow: hidden;
  padding: 0;
}
.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.thumb.is-active { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent); }

.thumb-status {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  color: #fff;
  font-size: 0.7rem;
}
.thumb-status.is-error { background: rgba(220,38,38,0.65); }

.thumb-spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  animation: spin 0.85s linear infinite;
}

.thumb-remove {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.6);
  color: #fff;
  font-size: 11px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.thumb-remove:hover { background: rgba(220,38,38,0.85); }

.thumb-add {
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  border-radius: 10px;
  border: 2px dashed var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.thumb-add:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Workspace ---------- */
.workspace-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.toolbar-left { display: flex; align-items: center; gap: 12px; }
.toolbar-right { display: flex; gap: 10px; flex-wrap: wrap; }

.batch-status {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.workspace-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 22px;
  align-items: start;
}

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

.canvas-pane {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.canvas-hint {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin: 0;
}

.canvas-wrap {
  position: relative;
  width: 100%;
  max-width: 760px;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(45deg, var(--checker-a) 25%, transparent 25%) -12px 0/24px 24px,
    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%) -12px 0/24px 24px,
    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%) -12px 0/24px 24px,
    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%) -12px 0/24px 24px,
    var(--checker-b);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
}

#result-canvas {
  max-width: 100%;
  max-height: 70vh;
  display: block;
  touch-action: none;
  cursor: grab;
}
#result-canvas:active { cursor: grabbing; }

#original-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--checker-b);
}

.empty-state {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ---------- Crop tool ---------- */
.crop-hint {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-right: 4px;
}

.crop-overlay {
  position: absolute;
  inset: 0;
  cursor: default;
}

.crop-box {
  position: absolute;
  border: 2px solid #fff;
  box-shadow: 0 0 0 2000px rgba(0, 0, 0, 0.55);
  cursor: move;
  touch-action: none;
}

.crop-handle {
  position: absolute;
  width: 16px;
  height: 16px;
  background: #fff;
  border: 2px solid var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  touch-action: none;
}
.crop-handle[data-corner="nw"] { top: 0; left: 0; cursor: nwse-resize; }
.crop-handle[data-corner="ne"] { top: 0; left: 100%; cursor: nesw-resize; }
.crop-handle[data-corner="sw"] { top: 100%; left: 0; cursor: nesw-resize; }
.crop-handle[data-corner="se"] { top: 100%; left: 100%; cursor: nwse-resize; }

/* ---------- Compare slider ---------- */
.compare-overlay {
  position: absolute;
  inset: 0;
}
.compare-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--checker-b);
  clip-path: inset(0 50% 0 0);
}
.compare-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 0;
  border-left: 2px solid #fff;
  transform: translateX(-1px);
  cursor: ew-resize;
  display: flex;
  align-items: center;
  justify-content: center;
}
.compare-handle-grip {
  background: #fff;
  color: #111;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}

/* ---------- Processing overlay ---------- */
.processing-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(2px);
  padding: 20px;
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid color-mix(in srgb, var(--text) 15%, transparent);
  border-top-color: var(--accent);
  animation: spin 0.85s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

#processing-label { color: var(--text); font-size: 0.95rem; margin: 0; }

.progress-track {
  width: 220px;
  height: 6px;
  background: color-mix(in srgb, var(--text) 12%, transparent);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width .2s ease;
}

.workspace-error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  padding: 24px;
  text-align: center;
}

#workspace-error-text { color: var(--danger); max-width: 380px; }

/* ---------- Controls pane ---------- */
.controls-pane {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: sticky;
  top: 76px;
}

.controls-pane h2 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 14px 0 10px;
}
.controls-pane h2:first-child { margin-top: 0; }

.control-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-elevated-2);
  border-radius: 10px;
  padding: 3px;
  margin-bottom: 6px;
}
.control-tab {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 7px 6px;
  border-radius: 8px;
  cursor: pointer;
}
.control-tab.is-active {
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.control-panel { display: flex; flex-direction: column; gap: 12px; }

.bg-swatches {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

.swatch {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 10px;
  border: 2px solid var(--border);
  cursor: pointer;
  padding: 0;
  background: var(--sw, transparent);
  position: relative;
  transition: transform .08s ease, border-color .15s ease;
}
.swatch:hover { transform: scale(1.06); }
.swatch.is-active { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent); }

.swatch-transparent {
  background:
    linear-gradient(45deg, #444 25%, transparent 25%) 0 0/10px 10px,
    linear-gradient(-45deg, #444 25%, transparent 25%) 0 0/10px 10px,
    linear-gradient(45deg, transparent 75%, #444 75%) 0 0/10px 10px,
    linear-gradient(-45deg, transparent 75%, #444 75%) 0 0/10px 10px,
    #888;
}

.swatch-custom {
  display: flex;
  align-items: center;
  justify-content: center;
  background: conic-gradient(red, yellow, lime, cyan, blue, magenta, red);
  overflow: hidden;
}
.swatch-custom input[type="color"] {
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
  border: none;
  padding: 0;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.86rem;
  color: var(--text);
  cursor: pointer;
}
.toggle-row input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
  cursor: pointer;
}

.bg-image-preview-wrap {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.bg-image-preview-wrap img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  display: block;
}
.btn-remove-chip {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.6);
  color: #fff;
  cursor: pointer;
}
.btn-remove-chip:hover { background: rgba(220,38,38,0.85); }

.slider-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.slider-row input[type="range"] { width: 100%; accent-color: var(--accent); }

.format-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
}
.format-row label { font-size: 0.85rem; color: var(--text-dim); }
.format-row select {
  background: var(--bg-elevated-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
}

.hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 10px;
  line-height: 1.4;
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.78rem;
  padding: 14px 20px 22px;
}
.footer p { margin: 4px 0; }
.footer .copyright {
  color: var(--text-dim);
  opacity: 0.8;
  font-size: 0.76rem;
}

/* ---------- Toasts ---------- */
.toast-host {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
  align-items: center;
}
.toast {
  background: var(--bg-elevated-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  box-shadow: var(--shadow);
  font-size: 0.88rem;
  animation: toast-in .18s ease;
}
.toast.is-error { border-color: color-mix(in srgb, var(--danger) 50%, var(--border)); color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0);} }