:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #f6821f;     /* Cloudflare orange */
  --brand-dark: #d96a0b;
  --accent: #2563eb;
  --ok: #059669;
  --danger: #dc2626;
  --radius: 12px;
}

* { box-sizing: border-box; }

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

.topbar {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand .logo { font-size: 32px; }
.brand h1 { font-size: 20px; margin: 0; }
.brand .sub { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.tabs { display: flex; gap: 8px; }
.tab {
  background: transparent; border: 1px solid var(--line);
  padding: 8px 16px; border-radius: 999px; cursor: pointer;
  font-size: 14px; color: var(--muted);
}
.tab.active { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }

main { max-width: 1000px; margin: 24px auto; padding: 0 16px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 22px; margin-bottom: 18px;
  box-shadow: 0 1px 2px rgba(0,0,0,.03);
}
.card h2 { font-size: 16px; margin: 0 0 6px; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-grid; place-items: center;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--brand); color: #fff; font-size: 13px; font-weight: 700;
}
.hint { color: var(--muted); font-size: 13px; margin: 0 0 14px; }
.muted { color: var(--muted); font-weight: 400; }
.hint code, code { background: #f1f5f9; padding: 1px 6px; border-radius: 6px; font-size: 12px; }
.req { color: var(--danger); }

.dropzone {
  border: 2px dashed var(--line); border-radius: var(--radius);
  padding: 32px; text-align: center; color: var(--muted);
  transition: all .15s ease;
}
.dropzone.drag { border-color: var(--brand); background: #fff7ee; color: var(--ink); }
.dropzone .filename { margin: 8px 0 0; font-weight: 600; color: var(--ink); }

.link {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font-size: inherit; padding: 0; text-decoration: underline;
}
.link.danger { color: var(--danger); }

.row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.row.hidden, .hidden { display: none !important; }
.checkbox { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; cursor: pointer; }

.field { margin: 12px 0; display: flex; flex-direction: column; gap: 6px; max-width: 460px; }
.field label { font-size: 13px; font-weight: 600; }
.field input[type="text"], .field input[type="number"], .field select, select, input[type="text"], input[type="number"] {
  padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; background: #fff; color: var(--ink);
}
input:focus, select:focus { outline: 2px solid #fde2c4; border-color: var(--brand); }

.advanced { margin: 14px 0; border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; }
.advanced summary { cursor: pointer; font-weight: 600; font-size: 14px; }
.output-headers {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0;
}
.output-headers .oh { display: flex; flex-direction: column; gap: 4px; }
.output-headers .oh label { font-size: 12px; color: var(--muted); }

.actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
button.primary {
  background: var(--brand); color: #fff; border: none;
  padding: 10px 18px; border-radius: 9px; font-size: 14px; font-weight: 600; cursor: pointer;
}
button.primary:hover { background: var(--brand-dark); }
button.primary:disabled { background: #d1d5db; cursor: not-allowed; }
.status { font-size: 13px; color: var(--muted); }
.status.ok { color: var(--ok); }
.status.err { color: var(--danger); }

.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 10px; max-height: 460px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; white-space: nowrap; }
thead th { position: sticky; top: 0; background: #f8fafc; font-weight: 600; z-index: 1; }
td.derived, th.derived { background: #fff7ee; }
tbody tr:hover td { background: #fafafa; }

.unit-form {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; align-items: end;
  margin-bottom: 16px;
}
.unit-form .form-actions { grid-column: 1 / -1; display: flex; gap: 12px; align-items: center; }
.toolbar { margin: 10px 0; }
.toolbar input { flex: 1; min-width: 180px; }

.foot { text-align: center; color: var(--muted); font-size: 12px; padding: 20px; }

@media (max-width: 720px) {
  .unit-form { grid-template-columns: 1fr 1fr; }
  .output-headers { grid-template-columns: 1fr; }
}