:root {
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #212529;
  --muted: #6c757d;
  --primary: #0d6efd;
  --success: #198754;
  --danger: #dc3545;
  --warning: #ffc107;
  --border: #dee2e6;
  --radius: 0.5rem;
  --max-width: 960px;
}

* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem;
}

nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav a {
  color: var(--text);
  text-decoration: none;
  margin-right: 1rem;
  font-weight: 500;
}

nav a:hover { color: var(--primary); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

h1, h2, h3 { margin-top: 0; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  text-decoration: none;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-secondary { background: var(--muted); color: #fff; }

.btn:hover { opacity: 0.9; }

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
}

textarea { min-height: 120px; resize: vertical; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.25rem; font-weight: 500; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.alert-danger { background: #f8d7da; color: #842029; }
.alert-success { background: #d1e7dd; color: #0f5132; }

.table {
  width: 100%;
  border-collapse: collapse;
}
.table th, .table td {
  text-align: left;
  padding: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.score-badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
}
.score-pass { background: #d1e7dd; color: #0f5132; }
.score-fail { background: #f8d7da; color: #842029; }

.timer {
  font-size: 1.25rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--primary);
}

audio { width: 100%; margin: 0.5rem 0; }

.mcq-option {
  display: block;
  padding: 0.5rem;
  margin: 0.25rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
}
.mcq-option input { margin-right: 0.5rem; }

.recording-btn {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.word-count {
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
  nav .container { flex-direction: column; gap: 0.5rem; }
}