:root {
  --ink: #16202b;
  --ink-soft: #4a5a68;
  --ink-muted: #8896a3;
  --paper: #fafaf8;
  --surface: #ffffff;
  --surface-2: #f2f1ed;
  --border: #e1e0da;
  --border-strong: #c9c8c1;
  --accent: #b5763a;
  --accent-bg: #f6ead9;
  --success: #3f7d54;
  --danger: #b64a3d;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

h1 {
  font-size: 26px;
  margin: 0 0 4px;
  font-weight: 600;
}

p { line-height: 1.5; }

.muted { color: var(--ink-soft); }
.tiny { font-size: 12px; color: var(--ink-muted); }

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 16px;
}

.brand .mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.nav { display: flex; gap: 8px; }

button, .btn {
  font-family: inherit;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

button:hover { background: var(--surface-2); }
button:disabled { opacity: 0.5; cursor: default; }

button.primary {
  border-color: var(--accent);
  background: var(--accent-bg);
  color: var(--accent);
  font-weight: 600;
}

button.nav-active {
  border-color: var(--accent);
  background: var(--accent-bg);
  color: var(--accent);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 12px;
}

.card.clickable { cursor: pointer; }
.card.clickable:hover { border-color: var(--border-strong); }

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.field { margin-bottom: 14px; }

.field label {
  display: block;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

input[type="text"], input[type="number"], select, textarea {
  font-family: inherit;
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--ink);
  width: 100%;
}

textarea { resize: vertical; }

.row { display: flex; gap: 8px; align-items: center; }
.row-between { display: flex; justify-content: space-between; align-items: center; }
.wrap-gap { display: flex; flex-wrap: wrap; gap: 8px; }

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

.passage-block {
  background: var(--surface-2);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 8px;
}

.passage-key {
  font-weight: 600;
  margin-right: 6px;
}

.mcq-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  padding: 6px 0;
  cursor: pointer;
}

.gapfill-text {
  font-size: 14px;
  line-height: 2.4;
  background: var(--surface-2);
  padding: 10px 14px;
  border-radius: 8px;
}

.gapfill-text select, .gapfill-text input {
  width: auto;
  min-width: 90px;
  display: inline-block;
  margin: 0 2px;
  font-size: 13px;
  padding: 3px 6px;
}

.code-badge {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--accent);
}

.level-badge {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent);
}

.metric-value { font-size: 24px; font-weight: 600; margin: 0; }
.metric-label { font-size: 13px; color: var(--ink-soft); margin: 0 0 4px; }

.error-text { color: var(--danger); font-size: 13px; margin: 4px 0 12px; }

.center-note {
  text-align: center;
  color: var(--ink-muted);
  font-size: 13px;
  padding: 24px 0;
}