:root {
  --ink: #1b1f24;
  --muted: #6b7280;
  --border: #e2e5e9;
  --accent: #2f6fed;
  --accent-dark: #1f52b8;
  --danger: #c0392b;
  --bg: #f6f7f9;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

header h1 {
  font-size: 1.6rem;
  margin-bottom: 4px;
}

header .sub {
  color: var(--muted);
  margin-top: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-top: 20px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 40px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone.drag-over {
  border-color: var(--accent);
  background: #f0f5ff;
}

.dropzone p { margin: 0; color: var(--muted); }

.error {
  color: var(--danger);
  font-size: 0.9rem;
}

.muted { color: var(--muted); font-size: 0.9rem; }

select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 1rem;
  margin: 12px 0 20px;
}

button, a.primary, a.secondary {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}

.primary {
  background: var(--accent);
  color: white;
}
.primary:hover { background: var(--accent-dark); }

.secondary {
  background: #eef2ff;
  color: var(--accent-dark);
  margin-left: 8px;
}

.link {
  background: none;
  color: var(--accent);
  padding: 12px 0;
  display: block;
  margin-top: 12px;
}

.progress-outer {
  background: #eef0f3;
  border-radius: 999px;
  height: 14px;
  overflow: hidden;
}

.progress-inner {
  background: var(--accent);
  height: 100%;
  width: 0%;
  transition: width 0.2s ease;
}

.preview-wrap { margin-top: 20px; }

#previewTable table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

#previewTable th, #previewTable td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
}

#previewTable {
  overflow-x: auto;
}