:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --line: #d8dee9;
  --text: #1f2937;
  --muted: #5b6473;
  --primary: #0f6cbf;
  --primary-dark: #0b548f;
  --ok: #0f8a4b;
  --bad: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(145deg, #f7f9fc 0%, #edf2f9 100%);
  color: var(--text);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.hero {
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 0.3rem;
  font-size: 1.9rem;
}

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

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 1rem;
}

h2 {
  margin-top: 0.8rem;
  margin-bottom: 0.6rem;
  font-size: 1.2rem;
}

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

.link-list {
  margin: 0.2rem 0 0;
  padding-left: 1.2rem;
}

.link-list li {
  margin: 0.35rem 0;
}

.link-list a {
  color: var(--primary-dark);
}

.licence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 0.75rem;
}

.licence-btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem;
  font-size: 1rem;
  background: #fff;
  cursor: pointer;
}

.licence-btn.active {
  border-color: var(--primary);
  background: #eaf5ff;
  color: #083f6a;
  font-weight: 600;
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.subject-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
}

input[type="number"] {
  width: 120px;
  padding: 0.45rem;
  margin-top: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 1rem;
}

button {
  cursor: pointer;
}

.primary,
.secondary {
  border: 0;
  border-radius: 10px;
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
}

.primary {
  margin-top: 0.7rem;
  background: var(--primary);
  color: #fff;
}

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

.primary:disabled {
  background: #8ab5dc;
  cursor: not-allowed;
}

.secondary {
  background: #e8edf4;
  color: #273142;
}

.error {
  min-height: 1.2rem;
  color: var(--bad);
  margin: 0.5rem 0 0;
}

.hidden {
  display: none;
}

.question-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.8rem;
  margin-bottom: 0.85rem;
}

.question-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.45rem;
}

.question-head h3 {
  margin: 0;
  font-size: 1rem;
}

.tag {
  font-size: 0.8rem;
  color: #0a5e9f;
  background: #eaf5ff;
  border-radius: 999px;
  padding: 0.15rem 0.45rem;
}

.options {
  display: grid;
  gap: 0.35rem;
}

.option-row {
  display: flex;
  gap: 0.45rem;
  align-items: flex-start;
}

.exam-actions {
  display: flex;
  gap: 0.7rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.score {
  font-weight: 700;
  font-size: 1.05rem;
}

.result-item {
  border-top: 1px solid var(--line);
  padding: 0.7rem 0;
}

.result-item p {
  margin: 0.3rem 0;
}

.correct {
  color: var(--ok);
}

.incorrect {
  color: var(--bad);
}

@media (max-width: 640px) {
  .container {
    padding: 1rem 0.6rem 2rem;
  }

  .licence-grid {
    grid-template-columns: 1fr;
  }

  .question-head {
    flex-direction: column;
    align-items: flex-start;
  }
}