:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1c2230;
  --muted: #5f6b85;
  --primary: #3a67ff;
  --primary-600: #2f55d6;
  --border: #e6e9f2;
  --shadow: 0 10px 30px rgba(28, 34, 48, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.hero {
  background: linear-gradient(135deg, #1c2230 0%, #2f3750 50%, #3a67ff 100%);
  color: #fff;
  padding: 4.5rem 0 3.5rem;
}

.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  opacity: 0.8;
}

.hero h1 {
  margin-top: 0.6rem;
  font-size: clamp(2rem, 4vw, 3rem);
}

.hero .subhead {
  margin-top: 1rem;
  max-width: 650px;
  font-size: 1.05rem;
  opacity: 0.9;
}

.hero-actions {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn.primary {
  background: #fff;
  color: #1c2230;
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.15);
}

.btn.ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.12);
}

.note {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  opacity: 0.7;
}

.section {
  padding: 3rem 0 1.5rem;
}

.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 1rem;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: rgba(58, 103, 255, 0.12);
  color: var(--primary-600);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.quiz-section {
  margin-bottom: 2rem;
}

.quiz-section h3 {
  margin: 1rem 0 0.75rem;
  font-size: 1.4rem;
}

.question {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.question h4 {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.question .meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.answer-list {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.5rem;
}

.answer-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.answer-item input,
.answer-item select {
  margin-top: 0.25rem;
}

input[type="text"],
select {
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  width: min(320px, 100%);
}

.actions {
  margin-top: 0.9rem;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.btn-small {
  border-radius: 10px;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-weight: 600;
}

.btn-small.primary {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}

.btn-small.primary:hover {
  background: var(--primary-600);
}

.feedback {
  margin-top: 0.8rem;
  font-size: 0.95rem;
}

.feedback.success {
  color: #15803d;
}

.feedback.error {
  color: #b91c1c;
}

.feedback.info {
  color: #1e3a8a;
}

.explanation {
  background: #f0f4ff;
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin-top: 0.8rem;
  color: #24304f;
  font-size: 0.95rem;
}

.footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}