:root {
  --surface: #ffffff;
  --page-background: #f5f6f8;
  --border: #dfe3e8;
  --border-strong: #c6ccd4;
  --text: #16191d;
  --text-muted: #626b76;
  --accent: #1f6feb;
  --accent-dark: #1a5ed1;
  --accent-soft: #eaf1fe;
  --success: #10794a;
  --success-soft: #e7f6ee;
  --warning: #8a5a00;
  --warning-soft: #fdf3e0;
  --danger: #b32318;
  --danger-soft: #fdeceb;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.05);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page-background);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

.page-header { margin-bottom: 32px; }

h1 {
  margin: 0 0 8px;
  font-size: 30px;
  letter-spacing: -0.02em;
}

.page-subtitle {
  margin: 0;
  max-width: 62ch;
  color: var(--text-muted);
}

.connection-status {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--text-muted);
}

.connection-status.is-warning {
  color: var(--warning);
  background: var(--warning-soft);
  border-radius: 8px;
  padding: 10px 12px;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.step-failed { border-color: #f3c0bc; }

.step-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.step-heading h2 {
  margin: 0;
  font-size: 19px;
  letter-spacing: -0.01em;
}

.step-heading h2:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.step-number {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}

.step-number-done { background: var(--success-soft); color: var(--success); }
.step-number-failed { background: var(--danger-soft); color: var(--danger); }

.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.is-dragging {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.dropzone-icon {
  width: 32px;
  height: 32px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  margin-bottom: 12px;
}

.dropzone-title { margin: 0 0 4px; font-weight: 600; }
.dropzone-hint { margin: 0; font-size: 14px; color: var(--text-muted); }

.file-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding: 14px 16px;
  margin-bottom: 24px;
  background: var(--page-background);
  border-radius: 8px;
  font-size: 14px;
}

.file-summary-name { font-weight: 600; }

.subsection-title {
  margin: 24px 0 4px;
  font-size: 15px;
}

.subsection-title:first-of-type { margin-top: 0; }

.subsection-hint {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--text-muted);
}

.mapping-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.mapping-field { display: flex; flex-direction: column; gap: 6px; }

.mapping-field label {
  font-size: 14px;
  font-weight: 600;
}

.mapping-field .mapping-help {
  font-size: 13px;
  color: var(--text-muted);
}

.mapping-field select {
  appearance: none;
  padding: 9px 32px 9px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'><path d='M2 4.5 6 8.5l4-4' fill='none' stroke='%23626b76' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/></svg>") no-repeat right 11px center / 11px 11px;
  font: inherit;
  font-size: 15px;
  color: var(--text);
}

.mapping-field select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.mapping-field.is-missing select { border-color: var(--danger); }

.transform-list { display: grid; gap: 10px; }

.transform-option {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.transform-option:hover { border-color: var(--border-strong); }

.transform-option.is-unavailable {
  cursor: default;
  background: var(--page-background);
}

.transform-option.is-unavailable .transform-label { color: var(--text-muted); }
.transform-option input { margin: 3px 0 0; width: 16px; height: 16px; accent-color: var(--accent); }
.transform-option .transform-label { display: block; font-weight: 600; font-size: 15px; }
.transform-option .transform-help { display: block; font-size: 13px; color: var(--text-muted); }

.preview-details { margin-top: 24px; font-size: 14px; }
.preview-details summary { cursor: pointer; color: var(--accent); }

.table-scroll {
  overflow-x: auto;
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
  white-space: nowrap;
}

th, td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  background: var(--page-background);
  font-weight: 600;
}

tbody tr:last-child td { border-bottom: none; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 24px;
}

.actions-download { margin-top: 0; margin-bottom: 24px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  text-decoration: none;
}

.button-primary { background: var(--accent); color: #fff; }
.button-primary:hover { background: var(--accent-dark); }
.button-primary[aria-disabled="true"], .button-primary:disabled { background: var(--border-strong); cursor: progress; }

.button-quiet {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
}

.button-quiet:hover { background: var(--page-background); }
.button-quiet:disabled { color: var(--text-muted); cursor: progress; }

.button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.progress-bar {
  height: 10px;
  border-radius: 999px;
  background: var(--page-background);
  border: 1px solid var(--border);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.3s ease;
}

.progress-label { margin: 12px 0 0; font-weight: 600; }
.progress-note { margin: 4px 0 0; font-size: 14px; color: var(--text-muted); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.stat-card {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--page-background);
}

.stat-card .stat-value { font-size: 22px; font-weight: 650; letter-spacing: -0.02em; }
.stat-card .stat-label { font-size: 13px; color: var(--text-muted); }
.stat-card.is-attention { background: var(--warning-soft); border-color: #f0dcb4; }
.stat-card.is-attention .stat-value { color: var(--warning); }

.panel {
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}

.panel h3 { margin: 0 0 4px; font-size: 15px; }
.panel p { margin: 0 0 12px; font-size: 14px; color: var(--text-muted); }
.panel ul { margin: 0; padding-left: 20px; font-size: 14px; }
.panel li { margin-bottom: 4px; }
.panel-warning { border-color: #f0dcb4; background: var(--warning-soft); }
.panel-warning p { color: var(--warning); }

.notice {
  margin: 16px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
}

.notice-error { background: var(--danger-soft); color: var(--danger); }
.notice-warning { background: var(--warning-soft); color: var(--warning); }

.inline-busy { margin: 16px 0 0; font-size: 14px; color: var(--text-muted); }

.stopped-message { margin: 0; color: var(--text-muted); }

#fileWarning { margin: -8px 0 24px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

@media (max-width: 560px) {
  .page { padding: 28px 16px 64px; }
  .step { padding: 18px; }
  h1 { font-size: 25px; }
  .stat-grid { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
  .actions .button { flex: 1 1 100%; }
}