/* Palette and scale live as custom properties so the step 7 design pass can retheme the
   app without hunting through rules. Named by role, not by colour, for the same reason. */
:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --ink: #17171a;
  --ink-muted: #5f5f6b;
  --line: #e2e2dd;
  --accent: #1f4fd8;

  --radius: 10px;
  --gap: 1.5rem;
  --measure: 62ch;

  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131316;
    --surface: #1c1c21;
    --ink: #f2f2f0;
    --ink-muted: #a3a3ad;
    --line: #32323a;
    --accent: #7ba2ff;
  }
}

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

body {
  margin: 0;
  padding: clamp(1.5rem, 5vw, 4rem);
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.masthead, main, footer {
  max-width: var(--measure);
  margin-inline: auto;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3rem);
  letter-spacing: -0.03em;
}

.tagline {
  margin: 0.25rem 0 0;
  color: var(--ink-muted);
  font-size: 1.1rem;
}

main { margin-top: var(--gap); }

.dropzone {
  padding: 3rem 1.5rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-muted);
  text-align: center;
  cursor: pointer;
}

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

.dropzone p { margin: 0.5rem 0; }

.dropzone-hint { font-size: 0.85rem; }

.file-picker {
  display: inline-block;
  margin: 0.25rem 0;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--surface);
  font-weight: 600;
  cursor: pointer;
}

.file-picker input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.error {
  margin-top: var(--gap);
  padding: 1rem 1.15rem;
  border-left: 3px solid #c4553d;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--surface);
  color: var(--ink);
}

.step-rail ol {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 var(--gap);
  padding: 0;
  list-style: none;
}

.step-rail__step {
  flex: 1;
  padding: 0.6rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-muted);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.step-rail__step:disabled { cursor: not-allowed; opacity: 0.5; }

.step-rail__step.is-current {
  border-color: var(--accent);
  color: var(--ink);
  font-weight: 600;
}

.step-rail__step.is-done { color: var(--ink); }

.step-panel { margin-top: var(--gap); }

.step-intro { color: var(--ink-muted); }

.placeholder-note {
  padding: 3rem 1.5rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--ink-muted);
  text-align: center;
}

.mapping-grid {
  display: grid;
  gap: 0.75rem;
  margin-bottom: var(--gap);
}

.mapping-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mapping-row__label {
  flex: 0 0 auto;
  width: 11rem;
  font-weight: 600;
}

.mapping-row select {
  flex: 1;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.row-review__summary { color: var(--ink-muted); }

#row-review h3 { margin-top: var(--gap); }

.row-skipped { color: var(--ink-muted); }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
}

th, td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

thead th {
  background: var(--surface);
  color: var(--ink-muted);
  font-weight: 600;
}

.privacy {
  margin-top: var(--gap);
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--surface);
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.privacy strong { color: var(--ink); }

footer {
  margin-top: calc(var(--gap) * 2);
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

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