:root {
  --ink:        #0d0d0d;
  --ink2:       #3a3a3a;
  --ink3:       #777;
  --paper:      #e0eaf7;
  --paper2:     #eeeae2;
  --paper3:     #e4dfd5;
  --white:      #ffffff;
  --blue:     #2563eb;;
  --blue-lt:  #fff0e6;
  --blue-dk:  #0847cf;
  --green:      #1a7a4a;
  --green-lt:   #e6f5ed;
  --blue:       #1a4fa0;
  --blue-lt:    #e6eeff;
  --red:        #c0392b;
  --red-lt:     #fdf0ef;
  --border:  #777777;
  --border2: #d0cec4;
  --shadow:  0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg:  0 4px 16px rgba(0, 0, 0, 0.08);
  --radius:     10px;
  --radius-sm:  6px;
  --ff-head: 'Inter', sans-serif;
  --ff-mono: 'JetBrains Mono', monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #f0ece4;
    --ink2:      #c8c1b4;
    --ink3:      #7a7469;
    --paper:     #141210;
    --paper2:    #1c1a17;
    --paper3:    #252118;
    --white:     #1e1c19;
    --blue:    #f07030;
    --blue-lt: #1f0e00;
    --blue-dk: #ff8040;
    --green:     #3db870;
    --green-lt:  #051a0d;
    --blue:      #5b8de8;
    --blue-lt:   #060e20;
    --border:    #2e2a22;
    --border2:   #3a342a;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--ff-head);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
}

/* ─── Converter App Shell ──────────────────────────── */
#conv-app {
  width: 92%;
  max-width: 1400px;
  margin: 24px auto 48px;
  border: 3px solid #fff;
  border-radius: 18px;
  background: var(--white);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 78vh;
}

/* ─── Top Header / Toolbar ────────────────────────── */
#conv-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 20px;
  background: var(--white);
  border-bottom: 1.5px solid var(--border);
  flex-wrap: wrap;
}

.conv-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.conv-logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.conv-logo-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.conv-logo-text span {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--ink3);
  letter-spacing: 0;
}

.conv-sep { width: 1px; height: 28px; background: var(--border); flex-shrink: 0; }

.conv-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.conv-nav a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink2);
  text-decoration: none;
  transition: all 0.13s;
  white-space: nowrap;
}
.conv-nav a:hover { background: var(--paper2); border-color: var(--border); }
.conv-nav a.active {
  background: var(--blue-lt);
  border-color: var(--blue);
  color: var(--blue-dk);
}

.conv-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  flex-wrap: wrap;
}

/* ─── Buttons ─────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--ink);
  font-family: var(--ff-head);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.13s;
  white-space: nowrap;
}
.btn:hover:not(:disabled) { background: var(--paper2); border-color: var(--border); }
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn svg { width: 14px; height: 14px; flex-shrink: 0; }

.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--blue-dk); border-color: var(--blue-dk); }

.btn-success {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}
.btn-success:hover:not(:disabled) { background: #15663d; border-color: #15663d; }

.btn-danger {
  background: var(--white);
  border-color: var(--border);
  color: var(--red);
}
.btn-danger:hover:not(:disabled) { background: var(--red-lt); border-color: var(--red); }

.btn-sm {
  padding: 3px 9px;
  height: 26px;
  font-size: 11.5px;
}

/* ─── Main Grid (Queue | Preview) ─────────────────── */
#conv-main {
  display: grid;
  grid-template-columns: 340px 1fr;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* ─── LEFT: Queue Panel ───────────────────────────── */
#queue-panel {
  border-right: 1.5px solid var(--border);
  display: flex;
  flex-direction: column;
  background: var(--paper);
  overflow: hidden;
}

.queue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--white);
  flex-shrink: 0;
}

.queue-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.queue-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--blue-lt);
  color: var(--blue-dk);
}

.queue-count {
  font-size: 12px;
  color: var(--ink3);
  font-weight: 500;
}

.queue-actions {
  display: flex;
  gap: 6px;
}

/* Drop Zone */
#drop-zone {
  margin: 12px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--white);
  flex-shrink: 0;
}
#drop-zone:hover, #drop-zone.dragover {
  border-color: var(--blue);
  background: var(--blue-lt);
}
#drop-zone .dz-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--paper2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
}
#drop-zone .dz-icon svg { width: 22px; height: 22px; color: var(--ink3); }
#drop-zone h3 {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--ink);
}
#drop-zone p {
  font-size: 11px;
  color: var(--ink3);
  margin-bottom: 12px;
}
#drop-zone .dz-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  background: var(--blue);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--ff-head);
  border: none;
  transition: background 0.13s;
}
#drop-zone .dz-btn:hover { background: var(--blue-dk); }
#drop-zone .dz-formats {
  margin-top: 8px;
  font-size: 10px;
  color: var(--ink3);
  font-family: var(--ff-mono);
}

input[type=file] { display: none; }

/* Queue List */
#queue-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}

/* Queue Item */
.q-item {
  background: var(--white);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.13s;
  flex-shrink: 0;
}
.q-item:hover { border-color: var(--blue); box-shadow: 0 2px 8px rgba(232,93,4,0.1); }
.q-item.selected { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(232,93,4,0.12); }

.q-item-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px;
}

.q-thumb {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--paper2);
  flex-shrink: 0;
  display: block;
}

.q-info { flex: 1; min-width: 0; }
.q-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}
.q-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10.5px;
  color: var(--ink3);
  font-family: var(--ff-mono);
}

.q-status {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.q-status.pending  { background: var(--paper2); color: var(--ink3); }
.q-status.done     { background: var(--green-lt); color: var(--green); }
.q-status.error    { background: var(--red-lt); color: var(--red); }
.q-status.working  { background: var(--blue-lt); color: var(--blue); }

.q-item-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Progress bar on item */
.q-progress {
  height: 3px;
  background: var(--paper2);
  display: none;
}
.q-progress-fill {
  height: 100%;
  background: var(--blue);
  width: 0%;
  transition: width 0.3s;
}
.q-item.working .q-progress { display: block; }
.q-item.working .q-progress-fill { animation: shimmer 1.2s ease-in-out infinite; }

@keyframes shimmer {
  0%   { width: 20%; }
  50%  { width: 80%; }
  100% { width: 20%; }
}


/* ══ HEADER SIZE ADJUSTMENTS ════════════════════════ */
#conv-app #conv-header { padding: 10px 15px; }
#conv-app .conv-logo-badge { width: 32px; height: 32px; }
#conv-app .conv-logo-text { font-size: 14px; }
#conv-app .conv-logo-text span { font-size: 10px; }
#conv-app .conv-sep { height: 24px; }
#conv-app .conv-nav a { padding: 4px 10px; font-size: 11px; }
#conv-app .btn { height: 30px; font-size: 11.5px; padding: 4px 12px; }

/* ─── RIGHT: Preview Panel ────────────────────────── */
#preview-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--white);
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: 8px;
}

.preview-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--green-lt);
  color: var(--green);
}

.preview-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink2);
  font-family: var(--ff-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 300px;
}

.preview-stats {
  display: flex;
  align-items: center;
  gap: 10px;
}
.stat-chip {
  padding: 2px 9px;
  border-radius: 20px;
  border: 1px solid var(--border2);
  font-size: 11px;
  color: var(--ink2);
  font-family: var(--ff-mono);
}
.stat-chip strong { color: var(--blue); font-weight: 700; }

.preview-header-right { display: flex; align-items: center; gap: 6px; }

/* Preview panes: before / after */
#preview-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--paper);
}
.pane + .pane { border-left: 1.5px solid var(--border); }

.pane-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 14px;
  background: var(--white);
  border-bottom: 1px solid var(--border2);
  flex-shrink: 0;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink2);
}
.pane-label .format-tag {
  font-family: var(--ff-mono);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--paper2);
  color: var(--ink3);
}
.pane-label .format-tag.png-tag {
  background: var(--green-lt);
  border-color: var(--green);
  color: var(--green);
}

.pane-canvas {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: auto;
  position: relative;
}

.pane-canvas img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  display: block;
}

.pane-canvas .pane-empty {
  text-align: center;
  color: var(--ink3);
  font-size: 13px;
}
.pane-canvas .pane-empty svg {
  width: 48px;
  height: 48px;
  color: var(--border);
  margin-bottom: 10px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.pane-canvas .pane-empty p { font-size: 12px; font-weight: 500; margin-bottom: 4px; }
.pane-canvas .pane-empty small { font-size: 11px; color: var(--ink3); }

/* Pane footer: size info */
.pane-footer {
  padding: 7px 14px;
  border-top: 1px solid var(--border2);
  background: var(--white);
  font-size: 11px;
  color: var(--ink3);
  font-family: var(--ff-mono);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

/* PNG info overlay on after-pane */
.png-info-bar {
  display: flex;
  align-items: center;
  gap: 6px;
}
.png-benefit {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px 7px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 600;
  background: var(--green-lt);
  color: var(--green);
}

/* ─── Empty / Idle state for full preview ─────────── */
#preview-idle {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--ink3);
  text-align: center;
  padding: 40px;
}
#preview-idle svg { width: 64px; height: 64px; color: var(--border); }
#preview-idle h3 { font-size: 15px; font-weight: 700; color: var(--ink2); }
#preview-idle p { font-size: 12px; max-width: 280px; }

/* ─── Global Progress Banner ──────────────────────── */
#conv-progress-bar {
  height: 3px;
  background: var(--paper2);
  position: relative;
  display: none;
}
#conv-progress-bar.visible { display: block; }
#conv-progress-fill {
  height: 100%;
  background: var(--blue);
  width: 0%;
  transition: width 0.4s;
}

/* ─── Batch Summary Footer ────────────────────────── */
#conv-footer {
  border-top: 1.5px solid var(--border);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--white);
  flex-wrap: wrap;
}
.footer-stat {
  font-size: 12px;
  color: var(--ink2);
  font-family: var(--ff-mono);
}
.footer-stat strong { color: var(--ink); font-weight: 700; }

/* ─── Toast ───────────────────────────────────────── */
#conv-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  z-index: 500;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.2s;
  pointer-events: none;
  max-width: 320px;
  font-family: var(--ff-head);
}
#conv-toast.show { opacity: 1; transform: translateY(0); }

/* ─── Responsive ─────────────────────────────────── */
@media (max-width: 1024px) {
  #conv-main { grid-template-columns: 300px 1fr; }
}
@media (max-width: 820px) {
  #conv-main { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  #queue-panel { max-height: 280px; border-right: none; border-bottom: 1.5px solid var(--border); }
  #preview-body { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .pane + .pane { border-left: none; border-top: 1.5px solid var(--border); }
}
@media (max-width: 600px) {
  #conv-app { width: 98%; margin: 10px auto 24px; border-radius: 12px; }
  #conv-header { padding: 10px 12px; }
  .conv-nav { display: none; }
  .conv-toolbar { width: 100%; }
  #conv-footer { gap: 8px; }
}

/* Loading spinner */
.spinner {
  width: 14px; height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin360 0.7s linear infinite;
  flex-shrink: 0;
  display: inline-block;
}
@keyframes spin360 { to { transform: rotate(360deg); } }

/* Checkerboard for PNG transparency */
.checker-bg {
  background-image:
    linear-gradient(45deg, #ccc 25%, transparent 25%),
    linear-gradient(-45deg, #ccc 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ccc 75%),
    linear-gradient(-45deg, transparent 75%, #ccc 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}