:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --fg: #14161a;
  --muted: #5b6270;
  --accent: #2454ff;
  --accent-fg: #ffffff;
  --border: #e2e5ea;
  --ok-bg: #e9f7ee;
  --ok-fg: #146c2e;
  --warn-bg: #fff6e0;
  --warn-fg: #7a5b00;
  --err-bg: #fdeceb;
  --err-fg: #a3241a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-alt: #171a20;
    --fg: #f0f2f5;
    --muted: #a0a7b4;
    --accent: #6b8cff;
    --accent-fg: #0b0e14;
    --border: #2a2e37;
    --ok-bg: #113522;
    --ok-fg: #6adf94;
    --warn-bg: #3a2f0a;
    --warn-fg: #ffcf5c;
    --err-bg: #3a1613;
    --err-fg: #ff8d82;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); }

code {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.site-header .wrap {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
  color: var(--fg);
}
.brand-tag {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

/* Hero */
.hero {
  padding: 40px 20px 24px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 38px);
  margin: 0 0 12px;
}
.hero .lede {
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 16px;
  max-width: 60ch;
}
.privacy-note {
  background: var(--ok-bg);
  color: var(--ok-fg);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 14px;
  max-width: 70ch;
}

/* Tool */
.tool {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 32px 20px 48px;
}
.tool h2 { margin-top: 0; }

.upload-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 20px 0;
}
@media (min-width: 720px) {
  .upload-grid { grid-template-columns: 1fr 1fr; }
}

.upload-col h3 { font-size: 15px; margin: 0 0 8px; }

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  background: var(--bg);
  color: var(--muted);
  font-size: 14px;
}
.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--accent);
  outline: none;
}
.dropzone--active {
  border-color: var(--accent);
  background: var(--ok-bg);
}
.dropzone p { margin: 0; }

.file-name {
  font-size: 13px;
  color: var(--muted);
  min-height: 18px;
  margin: 8px 0 0;
}

.mapping-panel {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.map-row {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}
.map-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
}
.map-row select {
  width: 100%;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-size: 13px;
}
.map-note { margin: 6px 0 0; font-size: 12px; }
.map-note--auto { color: var(--muted); }
.map-note--ambiguous { color: var(--warn-fg); }
.map-note--missing { color: var(--err-fg); }

.tool-options {
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.tool-status {
  font-size: 13px;
  color: var(--ok-fg);
  min-height: 18px;
  margin: 4px 0 0;
}
.option-row label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
}
.option-row select {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
}
.option-hint {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--muted);
  max-width: 60ch;
}
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-secondary { background: var(--bg); color: var(--fg); border: 1px solid var(--border); }

.results { margin-top: 32px; }
.results-grid, .preview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 16px 0;
}
@media (min-width: 720px) {
  .results-grid, .preview-grid { grid-template-columns: 1fr 1fr; }
}
.transform-list, .warnings-list {
  padding-left: 18px;
  font-size: 13px;
}
.transform-list li { color: var(--muted); margin-bottom: 6px; }
.warnings-list li { margin-bottom: 6px; }
.warnings-list .sev-error { color: var(--err-fg); }
.warnings-list .sev-warning { color: var(--warn-fg); }
.empty-note { color: var(--muted); list-style: none; margin-left: -18px; }
.disclaimer { font-size: 12px; color: var(--muted); margin-top: 10px; }

.preview-table { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); }
.preview-table table { border-collapse: collapse; width: 100%; font-size: 12px; }
.preview-table th, .preview-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}
.preview-table th { background: var(--bg-alt); }
.preview-truncated-note { font-size: 12px; color: var(--muted); padding: 6px 10px; margin: 0; }
.preview-grid .btn { margin-top: 10px; }

/* SEO content */
.content { padding: 48px 20px 64px; }
.content section { margin-bottom: 40px; }
.content h2 { font-size: 22px; border-top: 1px solid var(--border); padding-top: 32px; }
.content section:first-child h2 { border-top: none; padding-top: 0; }
.content h3 { font-size: 16px; margin-top: 24px; }
.content ol, .content ul { padding-left: 22px; }
.content li { margin-bottom: 6px; }

.req-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 12px 0;
}
.req-table th, .req-table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.req-table th { background: var(--bg-alt); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 48px;
  color: var(--muted);
  font-size: 13px;
}