:root {
  --bg: #f7fafc;
  --card: #fff;
  --accent: #2563eb;
  --correct: #16a34a;
  --wrong: #dc2626;
  --muted: #6b7280;
  --shadow: 0 6px 24px #1018280f;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial
}

* {
  box-sizing: border-box
}

html,
body {
  height: 100%
}

body {
  margin: 0;
  background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px
}

.container {
  width: 100%;
  max-width: 760px
}

.card {
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 28px
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px
}

.title {
  font-size: 20px;
  font-weight: 600;
  color: #0f172a
}

.progress {
  font-size: 13px;
  color: var(--muted)
}

.question {
  font-size: 18px;
  margin-bottom: 8px
}

.options {
  display: grid;
  gap: 10px
}

.option-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #f8fafc;
  border: 1px solid #0f172a0f;
  padding: 12px 14px;
  border-radius: 8px;
  cursor: pointer
}

.option-number {
  min-width: 28px;
  min-height: 28px;
  border-radius: 8px;
  display: inline-grid;
  place-items: center;
  font-weight: 600;
  background: #e6eefc;
  color: var(--accent);
  font-size: 13px
}

.controls {
  display: flex;
  justify-content: space-between;
  margin-top: 18px
}

.btn {
  background: var(--accent);
  color: #fff;
  border: 0;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600
}

.btn.secondary {
  background: #eef2ff;
  color: var(--accent)
}

.score-card {
  text-align: center;
  padding: 26px
}

.score-number {
  font-size: 42px;
  font-weight: 700
}

.small {
  font-size: 13px;
  color: var(--muted)
}

.copyright {
  position: relative;
  bottom: 10px;
  right: 14px;
  font-size: 11px;
  color: var(--muted);
  text-align: right;
  line-height: 1.4
}