:root {
  /* Color — oklch palette from the "Design" pass */
  --bg: oklch(96.5% 0.008 250);
  --panel: oklch(99% 0.003 250);
  --panel-muted: oklch(97.5% 0.006 250);
  --border: oklch(89% 0.012 250);
  --border-strong: oklch(78% 0.02 255);
  --text: oklch(18% 0.015 260);
  --text-dim: oklch(46% 0.02 255);
  --text-faint: oklch(62% 0.015 255);
  --accent: oklch(52% 0.19 268);
  --accent-hover: oklch(42% 0.19 268);
  --accent-dim: oklch(94% 0.03 268);
  --accent-text: oklch(42% 0.19 268);
  --accent-border: oklch(85% 0.05 268);
  --success: oklch(58% 0.14 165);
  --success-dim: oklch(94% 0.04 165);
  --success-border: oklch(88% 0.06 165);
  --warning: oklch(55% 0.13 70);
  --warning-bg: oklch(95% 0.05 80);
  --warning-border: oklch(88% 0.07 80);
  --danger: oklch(55% 0.19 25);

  /* Scale */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 2px rgba(20, 22, 30, 0.04);
  --shadow-focus: 0 0 0 3px var(--accent-dim);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 28px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 13px;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  color: var(--accent-text);
  flex-shrink: 0;
}
.brand-text { min-width: 0; }
.brand h1 { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.subtitle { margin: 2px 0 0; color: var(--text-dim); font-size: 12px; font-family: var(--mono); }

.topbar-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.lang-switch {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-dim);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: border-color .12s, color .12s, background .12s;
}
.lang-switch:hover { color: var(--accent-text); border-color: var(--accent-border); background: var(--accent-dim); }

.privacy-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--success-dim);
  color: var(--success);
  font-size: 12px;
  font-weight: 700;
  font-family: var(--mono);
  border: 1px solid var(--success-border);
  flex-shrink: 0;
  white-space: nowrap;
}
.privacy-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  animation: zx-pulse 2s ease-in-out infinite;
}
@keyframes zx-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }

/* ---------- Layout ---------- */
main {
  max-width: 880px;
  width: 100%;
  margin: 22px auto;
  padding: 0 20px 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 18px 20px;
}

/* ---------- Settings ---------- */
.setting-block { display: flex; flex-direction: column; gap: 9px; }
/* Scoped to direct children only — otherwise this also matches the two
   .setting-block columns inside .settings-row-2 (they're adjacent siblings
   too), giving the second column an extra 18px top margin and knocking it
   out of alignment with the first. */
.settings-panel > .setting-block + .setting-block { margin-top: 18px; }

.block-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--mono);
}

.settings-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 18px;
}

.preset-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.preset-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  background: var(--panel-muted);
  cursor: pointer;
  text-align: left;
  transition: border-color .12s, background .12s, box-shadow .12s, transform .06s;
}
.preset-card:hover { border-color: var(--border-strong); background: #fff; }
.preset-card:active { transform: scale(0.98); }
.preset-card.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  box-shadow: var(--shadow-focus);
}
.preset-name { font-size: 13px; font-weight: 700; color: var(--text); }
.preset-card.active .preset-name { color: var(--accent-text); }
.preset-desc { font-size: 11px; color: var(--text-dim); line-height: 1.35; }

.select-control {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: 13px;
  background: #fff;
  color: var(--text);
  width: 100%;
  cursor: pointer;
}
.select-control:focus-visible { outline: none; border-color: var(--accent); box-shadow: var(--shadow-focus); }

.hint-inline { margin: 6px 0 0; font-size: 11px; color: var(--text-faint); }
.hint-warning {
  color: var(--warning);
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-sm);
  padding: 6px 9px;
  line-height: 1.5;
}

/* ---------- Advanced (details/summary) ---------- */
.advanced-toggle { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 12px; }
.advanced-toggle summary {
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-dim);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 7px;
  user-select: none;
}
.advanced-toggle summary::-webkit-details-marker { display: none; }
.advanced-toggle summary::before {
  content: '▸';
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  transition: transform .15s;
}
.advanced-toggle[open] summary::before { transform: rotate(90deg); }
.advanced-toggle summary:hover { color: var(--text); }

.advanced-panel {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.adv-row { display: flex; flex-direction: column; gap: 6px; font-size: 12.5px; color: var(--text); }
.adv-row .mono-value { font-family: var(--mono); font-weight: 700; color: var(--accent-text); }
.adv-row input[type="range"] {
  width: 100%;
  max-width: 420px;
  accent-color: var(--accent);
}
.adv-row input[type="range"]:disabled { opacity: .4; }
.checkbox-row { flex-direction: row; align-items: flex-start; gap: 8px; }
.checkbox-row label { display: flex; align-items: flex-start; gap: 8px; font-size: 12px; color: var(--text-dim); cursor: pointer; }
.checkbox-row input[type="checkbox"] { margin-top: 2px; accent-color: var(--accent); flex-shrink: 0; }

/* ---------- Dropzone ---------- */
.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--panel);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover { border-color: var(--accent); }
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.dropzone-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 10px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 16px;
  color: var(--text-faint);
}
.dropzone-title { margin: 0 0 6px; font-size: 14.5px; }
.dropzone .hint { color: var(--text-dim); font-size: 12px; margin: 0 0 12px; }

/* ---------- Hot-folder automation panel ---------- */
.hotfolder-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
}
.hotfolder-dirname {
  font-size: 12px;
  font-family: var(--mono);
  color: var(--text-dim);
  background: var(--panel-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
}

.format-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin: 0;
  padding: 0;
}
.chip {
  font-size: 10.5px;
  font-weight: 700;
  font-family: var(--mono);
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 9px;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent-text);
  cursor: pointer;
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 0;
}

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  position: sticky;
  top: 70px;
  z-index: 5;
  background: var(--bg);
  padding: 6px 2px;
}
.summary { font-size: 12.5px; color: var(--text-dim); font-family: var(--mono); }
.toolbar-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 700;
  background: #fff;
  color: var(--text-dim);
  transition: border-color .12s, background .12s, color .12s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.btn:hover { border-color: var(--border-strong); background: var(--panel-muted); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.primary:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: #fff; color: var(--text-dim); }

/* ---------- Results ---------- */
.results {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-card {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 14px;
  box-shadow: var(--shadow-sm);
}

.thumb {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: var(--bg);
  flex-shrink: 0;
}

.file-info { min-width: 0; }
.file-name {
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-sizes { font-size: 11.5px; color: var(--text-dim); margin-top: 2px; font-family: var(--mono); }
.saved { color: var(--success); font-weight: 700; }
.grew { color: var(--warning); font-weight: 700; }
.file-status { font-size: 11.5px; color: var(--text-faint); margin-top: 2px; display: flex; align-items: center; }
.file-status.error { color: var(--danger); }
.file-status.warn { color: var(--warning); }
.file-status.processing { color: var(--accent-text); }
.file-status.processing::after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-left: 6px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: zx-spin .8s linear infinite;
}
@keyframes zx-spin { to { transform: rotate(360deg); } }

.card-actions { display: flex; gap: 7px; justify-self: end; }
.card-actions .btn { padding: 6px 12px; font-size: 12px; }

/* ---------- SEO content panel (feature grid + FAQ) ---------- */
.seo-panel h2 {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 22px;
}
.feature-item { display: flex; gap: 12px; align-items: flex-start; }
.feature-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--accent-text);
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
}
.feature-item strong { display: block; font-size: 13.5px; margin-bottom: 3px; }
.feature-item p { margin: 0; font-size: 12px; color: var(--text-dim); line-height: 1.55; }

.faq-list { display: flex; flex-direction: column; gap: 8px; border-top: 1px solid var(--border); padding-top: 16px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  background: var(--panel-muted);
}
.faq-item summary {
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 7px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: '▸';
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  transition: transform .15s;
}
.faq-item[open] summary::before { transform: rotate(90deg); }
.faq-item p { margin: 8px 0 2px; font-size: 12.5px; color: var(--text-dim); line-height: 1.6; }

@media (max-width: 720px) {
  .feature-grid { grid-template-columns: 1fr; }
}

footer {
  max-width: 880px;
  margin: 8px auto 40px;
  padding: 0 20px;
  color: var(--text-faint);
  font-size: 11px;
  line-height: 1.7;
}
footer code {
  background: var(--panel-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: var(--mono);
  font-size: 11px;
}

@media (max-width: 720px) {
  .topbar { padding: 14px 16px; }
  .subtitle { display: none; }
  main { padding: 0 14px 44px; margin: 16px auto; }
  .panel { padding: 16px; }
  .preset-cards { grid-template-columns: repeat(2, 1fr); }
  .settings-row-2 { grid-template-columns: 1fr; }
  .toolbar { top: 0; }
}

@media (max-width: 560px) {
  .result-card { grid-template-columns: 42px 1fr; grid-template-rows: auto auto; }
  .card-actions { grid-column: 1 / -1; justify-content: flex-end; }
  .thumb { width: 42px; height: 42px; }
}