/* ===== 1. Design tokens ===== */
:root {
  --primary: #0f766e;
  --primary-hover: #0d5d56;
  --primary-muted: #ccfbf1;
  --accent: #14b8a6;
  --success: #059669;
  --danger: #dc2626;
  --warning: #d97706;
  --bg: #fafafa;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgb(0 0 0 / 0.06);
  --shadow-lg: 0 4px 20px -4px rgb(0 0 0 / 0.08), 0 2px 8px -2px rgb(0 0 0 / 0.04);
}

/* ===== 2. Auth bar (페이지 최상단 고정) ===== */
.auth-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  margin: -48px -24px 24px -24px;
}
.auth-bar__inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}
.auth-bar__guest,
.auth-bar__status {
  display: flex;
  align-items: center;
  gap: 12px;
}
.auth-bar__guest .auth-bar__hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.auth-bar__btn {
  font: inherit;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  font-size: 0.9rem;
}
.auth-bar__btn--google {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border);
}
.auth-bar__btn--google:hover {
  border-color: var(--primary);
  color: var(--primary);
}
/* 一時: ゲスト利用のため Google ログインボタンを非表示 */
.auth-bar__btn--google {
  display: none !important;
}
.auth-bar__btn--logout {
  color: var(--text-muted);
}
.auth-bar__btn--logout:hover {
  color: var(--danger);
  border-color: var(--danger);
}
.auth-bar__btn--mock-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.auth-bar__btn--mock-sub:hover {
  color: var(--primary);
  border-color: var(--primary);
}
.auth-bar__limits {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-right: 8px;
}
.auth-bar .auth-bar__status { display: none; }
.auth-bar .auth-bar__guest { display: flex; }
.auth-bar.is-logged-in .auth-bar__status { display: flex; }
.auth-bar.is-logged-in .auth-bar__guest { display: none; }

/* ===== 2b. Base ===== */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 48px 24px 64px;
  line-height: 1.6;
  font-size: 15px;
}

/* ===== 3. Header ===== */
.header {
  text-align: center;
  margin-bottom: 40px;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 8px;
  color: var(--text);
}

.description {
  color: var(--text-muted);
  margin: 0;
  font-size: 0.95rem;
}

.header-hint {
  margin: 12px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== 4. Layout ===== */
.container {
  max-width: 1000px;
  margin: 0 auto;
}

.main-layout {
  display: flex;
  gap: 24px;
  align-items: stretch;
}

.column-left,
.column-right {
  flex: 1;
  min-width: 0;
}

#compareSection {
  display: none;
}

#compareSection.is-visible {
  display: flex;
  flex-direction: column;
}

.compare-actions {
  margin-top: 28px;
  text-align: center;
}

.compare-actions .btn-primary {
  display: inline-flex;
  width: auto;
  padding: 14px 28px;
  text-decoration: none;
}

.btn-primary--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== 5. Cards ===== */
.column-left,
.column-right {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
}

/* ===== 6. Upload box ===== */
.upload-box {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  background: var(--bg);
}

.upload-box:hover,
.upload-box.upload-box--active {
  border-color: var(--primary);
  background: var(--primary-muted);
}

.upload-box--compact {
  padding: 20px 24px;
}

.upload-box input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.upload-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.upload-icon {
  width: 40px;
  height: 40px;
  color: var(--text-muted);
  transition: color 0.2s;
}

.upload-box:hover .upload-icon,
.upload-box.upload-box--active .upload-icon {
  color: var(--primary);
}

.upload-icon svg {
  width: 100%;
  height: 100%;
}

.upload-title {
  font-weight: 600;
  color: var(--text);
}

.upload-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== 7. Section title ===== */
.csv-summary {
  margin-top: 20px;
}


.section-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 20px;
  color: var(--text);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

/* ===== 8. Stat grid ===== */
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.stat-item--full {
  grid-column: 1 / -1;
}

.delimiter-override-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.delimiter-override-wrap .stat-label {
  flex-shrink: 0;
}

.delimiter-select {
  padding: 6px 10px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  min-width: 140px;
}

.stat-label {
  color: var(--text-muted);
}

.stat-value {
  font-weight: 600;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.stat-value--filename {
  font-variant-numeric: normal;
  word-break: break-all;
  font-size: 0.85rem;
}

/* ===== 9. Buttons ===== */
.btn-primary,
.btn-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  margin-top: 20px;
  font-family: inherit;
}

.btn-primary:focus-visible,
.btn-secondary:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border-light);
  border-color: var(--border);
}

/* ===== 10. Diff result ===== */
.diff-result {
  margin-top: 24px;
  padding: 20px;
  background: var(--bg);
  border-radius: var(--radius);
}

.diff-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--text);
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.diff-item {
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
}

.diff-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.diff-value {
  font-size: 1.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.diff-item--new .diff-value { color: var(--success); }
.diff-item--deleted .diff-value { color: var(--danger); }
.diff-item--changed .diff-value { color: var(--warning); }

/* ===== 11. Footer ===== */
.footer {
  margin-top: 40px;
  text-align: center;
}

.note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

.note a {
  color: var(--primary);
  text-decoration: none;
}

.note a:hover {
  text-decoration: underline;
}

/* ===== 12. Animation ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.compare-section {
  animation: fadeIn 0.35s ease-out;
}

#csvSummary {
  animation: fadeIn 0.35s ease-out;
}

/* ===== 13. Responsive ===== */
@media (max-width: 768px) {
  body {
    padding: 24px 16px 48px;
  }

  .main-layout {
    flex-direction: column;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }

  .diff-grid {
    grid-template-columns: 1fr;
  }

  .column-left,
  .column-right {
    padding: 20px;
  }
}

/* ===== 14. Legacy / Preview / Validate (kept for compatibility) ===== */
.container.wide { max-width: 900px; }
.file-info { background: var(--bg); padding: 12px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 13px; }
.table-wrapper { max-height: 400px; overflow: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 20px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { border: 1px solid var(--border); padding: 8px 12px; white-space: nowrap; }
th { background: var(--bg); font-weight: 600; position: sticky; top: 0; }
.validate-layout { display: flex; gap: 16px; }
.issue-list { width: 280px; border: 1px solid var(--border); padding: 12px; overflow-y: auto; max-height: 400px; border-radius: var(--radius-sm); }
.issue-list li { font-size: 12px; margin-bottom: 6px; cursor: pointer; }
.error { color: var(--danger); }
.warning { color: var(--warning); }
.info { color: var(--primary); }
.cell-error { background: #fee2e2; }
.cell-warning { background: #fff7ed; }
.cell-info { background: var(--primary-muted); }