:root {
  --qz-blue: #3B82C4;
  --qz-blue-dark: #235C8F;
  --qz-bg: #F3F8FD;
  --qz-ink: #1C2733;
  --qz-ink-soft: #5B6B7A;
  --qz-border: #E1E9F1;
  --qz-card: #FFFFFF;
  --qz-accent: #3B82C4;
  --qz-correct: #2FA86B;
  --qz-wrong: #E2574C;
  --qz-font-display: "Fraunces", Georgia, serif;
  --qz-font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --qz-radius-lg: 22px;
  --qz-radius-md: 14px;
  --qz-shadow: 0 10px 30px rgba(28, 39, 51, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--qz-font-body);
  color: var(--qz-ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(59,130,196,0.10), transparent 40%),
    radial-gradient(circle at 88% 92%, rgba(124,92,255,0.08), transparent 42%),
    var(--qz-bg);
  min-height: 100vh;
}

a { color: inherit; }

.qz-shell {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

/* ---------- Topbar ---------- */
.qz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0 8px;
}
.qz-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--qz-blue-dark);
  font-family: var(--qz-font-display);
  font-weight: 600;
  font-size: 1.05rem;
}
.qz-topbar__label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qz-blue);
  background: rgba(59,130,196,0.1);
  padding: 6px 12px;
  border-radius: 999px;
}

/* ---------- Screens ---------- */
.qz-screen { display: none; animation: qzFadeUp 0.4s ease both; }
.qz-screen--active { display: block; }
@keyframes qzFadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.qz-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qz-accent);
}

/* ---------- Screen 1: intro + subject grid ---------- */
.qz-intro { text-align: center; padding: 26px 0 8px; }
.qz-intro h1 {
  font-family: var(--qz-font-display);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 700;
  margin: 10px 0 10px;
}
.qz-intro p {
  color: var(--qz-ink-soft);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.55;
}

.qz-subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 16px;
  margin-top: 30px;
}

.qz-subject-card {
  position: relative;
  text-align: left;
  background: var(--qz-card);
  border: 1px solid var(--qz-border);
  border-radius: var(--qz-radius-lg);
  padding: 22px 20px 20px;
  cursor: pointer;
  font: inherit;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
  transition: transform 0.22s cubic-bezier(.2,.8,.3,1.3), box-shadow 0.22s ease, border-color 0.22s ease;
}
.qz-subject-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: var(--accent);
}
.qz-subject-card:hover, .qz-subject-card:focus-visible {
  transform: translateY(-5px) scale(1.015);
  box-shadow: var(--qz-shadow);
  border-color: var(--accent);
  outline: none;
}
.qz-subject-card__icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--accent) 14%, white);
  color: var(--accent);
}
.qz-subject-card__icon svg { width: 22px; height: 22px; }
.qz-subject-card__label {
  font-family: var(--qz-font-display);
  font-weight: 600;
  font-size: 1.08rem;
}
.qz-subject-card__count {
  font-size: 0.8rem;
  color: var(--qz-ink-soft);
}
.qz-subject-card__go {
  margin-top: 4px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.qz-subject-card:hover .qz-subject-card__go { opacity: 1; transform: translateX(0); }

/* ---------- Screen 2: quiz play ---------- */
.qz-quiz-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 22px 0 18px;
}
.qz-quiz-head__subject {
  font-family: var(--qz-font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--qz-accent);
}
.qz-dots { display: flex; gap: 6px; margin-top: 8px; }
.qz-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--qz-border);
  transition: background 0.2s ease, transform 0.2s ease;
}
.qz-dot--done { background: var(--qz-accent); }
.qz-dot--current { background: var(--qz-accent); transform: scale(1.5); }

.qz-timer { position: relative; width: 64px; height: 64px; flex-shrink: 0; }
.qz-timer__ring { width: 64px; height: 64px; transform: rotate(-90deg); }
.qz-timer__track { fill: none; stroke: var(--qz-border); stroke-width: 5; }
.qz-timer__arc {
  fill: none;
  stroke: var(--qz-accent);
  stroke-width: 5;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.1s linear, stroke 0.2s ease;
}
.qz-timer__num {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.05rem;
}
.qz-timer--urgent .qz-timer__arc { stroke: var(--qz-wrong); }
.qz-timer--urgent .qz-timer__num { color: var(--qz-wrong); animation: qzPulse 0.6s ease infinite; }
@keyframes qzPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.18); }
}

.qz-card {
  background: var(--qz-card);
  border: 1px solid var(--qz-border);
  border-radius: var(--qz-radius-lg);
  padding: 32px 28px;
  box-shadow: var(--qz-shadow);
}
.qz-question-count {
  margin: 0 0 6px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--qz-ink-soft);
}
.qz-question-text {
  font-family: var(--qz-font-display);
  font-weight: 600;
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  margin: 0 0 24px;
  line-height: 1.4;
}

.qz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 560px) {
  .qz-options { grid-template-columns: 1fr; }
}
.qz-option {
  text-align: left;
  padding: 14px 16px;
  border-radius: var(--qz-radius-md);
  border: 1.5px solid var(--qz-border);
  background: #FBFDFF;
  font: inherit;
  font-size: 0.96rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}
.qz-option:hover:not(:disabled) {
  border-color: var(--qz-accent);
  transform: translateY(-2px);
}
.qz-option:disabled { cursor: default; }
.qz-option--correct {
  border-color: var(--qz-correct);
  background: rgba(47,168,107,0.12);
  font-weight: 600;
}
.qz-option--wrong {
  border-color: var(--qz-wrong);
  background: rgba(226,87,76,0.12);
}

/* ---------- Screen 3: results ---------- */
.qz-results { text-align: center; padding: 20px 0; }
.qz-results h1 {
  font-family: var(--qz-font-display);
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  margin: 8px 0 6px;
}
.qz-results__message {
  color: var(--qz-ink-soft);
  max-width: 440px;
  margin: 0 auto 30px;
  line-height: 1.55;
}

.qz-results__stats {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.qz-stat {
  background: var(--qz-card);
  border: 1px solid var(--qz-border);
  border-radius: var(--qz-radius-md);
  padding: 16px 26px;
  min-width: 120px;
}
.qz-stat--score { border-color: var(--qz-accent); background: color-mix(in srgb, var(--qz-accent) 8%, white); }
.qz-stat__label {
  display: block;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--qz-ink-soft);
  margin-bottom: 4px;
}
.qz-stat__value {
  font-family: var(--qz-font-display);
  font-weight: 700;
  font-size: 1.9rem;
  color: var(--qz-ink);
}
.qz-stat--score .qz-stat__value { color: var(--qz-accent); }
.qz-stat__of { font-size: 1.1rem; color: var(--qz-ink-soft); font-weight: 500; }

.qz-confetti {
  position: relative;
  height: 0;
  overflow: visible;
}
.qz-confetti__piece {
  position: absolute;
  top: -20px;
  width: 8px; height: 14px;
  opacity: 0.9;
  border-radius: 2px;
  animation-name: qzFall;
  animation-timing-function: ease-in;
  animation-fill-mode: forwards;
}
@keyframes qzFall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(340px) rotate(360deg); opacity: 0; }
}

.qz-results__actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 36px;
}
.qz-results__explore {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--qz-border);
}
.qz-results__explore p {
  margin: 0 0 14px;
  font-weight: 600;
  color: var(--qz-ink-soft);
}
.qz-results__explore-links {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.qz-btn {
  font: inherit;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.qz-btn--primary {
  background: var(--qz-accent);
  color: white;
}
.qz-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(59,130,196,0.3); }
.qz-btn--outline {
  background: transparent;
  border-color: var(--qz-border);
  color: var(--qz-ink);
}
.qz-btn--outline:hover { border-color: var(--qz-accent); color: var(--qz-accent); }
.qz-btn--ghost {
  background: rgba(59,130,196,0.08);
  color: var(--qz-blue-dark);
  font-size: 0.85rem;
  padding: 10px 18px;
}
.qz-btn--ghost:hover { background: rgba(59,130,196,0.16); }

@media (prefers-reduced-motion: reduce) {
  .qz-screen, .qz-subject-card, .qz-option, .qz-btn, .qz-confetti__piece { animation: none !important; transition: none !important; }
}