:root {
  --bg: #f5f7fb;
  --ink: #121826;
  --muted: #657083;
  --surface: #ffffff;
  --surface-2: #edf2f7;
  --line: #d9e2ec;
  --accent: #0f766e;
  --accent-2: #f97316;
  --accent-3: #2563eb;
  --good: #15803d;
  --bad: #c2410c;
  --shadow: 0 24px 70px rgba(23, 37, 84, 0.14);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.08), transparent 32%),
    linear-gradient(225deg, rgba(37, 99, 235, 0.08), transparent 30%),
    var(--bg);
}

button {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.quiz-panel {
  width: min(980px, 100%);
  min-height: min(720px, calc(100vh - 48px));
  background: var(--surface);
  border: 1px solid rgba(217, 226, 236, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

.quiz-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.045) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to bottom, black, transparent 68%);
}

.app-header,
.screen {
  position: relative;
  z-index: 1;
}

.app-header {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.header-stats {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.header-stats span {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.screen {
  display: none;
  padding: 34px;
}

.screen-active {
  display: block;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 28px;
  align-items: stretch;
  margin-bottom: 28px;
}

.intro-copy {
  padding: 18px 0;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  max-width: 660px;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 0.96;
  font-weight: 800;
  letter-spacing: 0;
}

.intro-copy p {
  max-width: 560px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

.score-plate {
  min-height: 230px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 6px;
  color: #fff;
  background:
    linear-gradient(145deg, rgba(18, 24, 38, 0.92), rgba(15, 118, 110, 0.92)),
    url("../../assets/img/cover-project--zanxa-ai.webp") center/cover;
  border-radius: var(--radius);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.plate-number {
  font-family: "JetBrains Mono", monospace;
  font-size: 84px;
  line-height: 1;
  font-weight: 700;
}

.plate-label {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

.mode-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.mode-card {
  min-height: 156px;
  padding: 18px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.84);
  color: var(--ink);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.mode-card:hover,
.mode-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(15, 118, 110, 0.45);
  box-shadow: 0 14px 30px rgba(23, 37, 84, 0.09);
  outline: none;
}

.mode-card.selected {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent), 0 14px 30px rgba(15, 118, 110, 0.12);
}

.mode-icon {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  color: #fff;
  background: var(--ink);
  border-radius: var(--radius);
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
}

.mode-card:nth-child(2) .mode-icon {
  background: var(--accent-3);
}

.mode-card:nth-child(3) .mode-icon {
  background: var(--accent-2);
}

.mode-card strong,
.mode-card small {
  display: block;
}

.mode-card strong {
  font-size: 18px;
  margin-bottom: 8px;
}

.mode-card small {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 800;
  letter-spacing: 0;
}

.primary-btn {
  width: 100%;
  color: #fff;
  background: var(--ink);
}

.primary-btn:hover,
.primary-btn:focus-visible {
  background: #233044;
  outline: none;
}

.secondary-btn {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
}

.secondary-btn:hover,
.secondary-btn:focus-visible {
  border-color: var(--ink);
  outline: none;
}

.secondary-btn:disabled {
  cursor: not-allowed;
  color: #9ca3af;
  background: #f8fafc;
  border-color: var(--line);
}

.primary-btn svg,
.secondary-btn svg,
.timer svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.primary-btn svg {
  fill: currentColor;
  stroke: none;
}

.quiz-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.micro-label {
  margin-bottom: 10px;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

#question-title {
  max-width: 720px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12;
  letter-spacing: 0;
}

.timer {
  min-width: 92px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font-family: "JetBrains Mono", monospace;
  font-weight: 700;
}

.timer.low {
  color: var(--bad);
  border-color: rgba(194, 65, 12, 0.45);
}

.progress-track {
  height: 10px;
  overflow: hidden;
  background: var(--surface-2);
  border-radius: 999px;
  margin-bottom: 24px;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  transition: width 260ms ease;
}

.answer-list {
  display: grid;
  gap: 12px;
}

.answer-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 64px;
  padding: 14px;
  color: var(--ink);
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.answer-btn:hover,
.answer-btn:focus-visible {
  transform: translateX(3px);
  border-color: rgba(37, 99, 235, 0.5);
  outline: none;
}

.answer-index {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  font-weight: 700;
}

.answer-btn.correct {
  border-color: rgba(21, 128, 61, 0.55);
  background: rgba(21, 128, 61, 0.08);
}

.answer-btn.wrong {
  border-color: rgba(194, 65, 12, 0.55);
  background: rgba(194, 65, 12, 0.08);
}

.answer-btn:disabled {
  cursor: default;
  transform: none;
}

.quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.live-score {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.live-score strong {
  color: var(--ink);
  font-family: "JetBrains Mono", monospace;
  font-size: 30px;
}

.result-card {
  padding: 28px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
  margin-bottom: 18px;
}

.result-card .micro-label,
.result-card p {
  color: rgba(255, 255, 255, 0.72);
}

.result-card h2 {
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1;
  margin-bottom: 18px;
}

.result-score {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 12px;
  font-family: "JetBrains Mono", monospace;
}

.result-score span {
  font-size: 82px;
  line-height: 0.9;
  font-weight: 700;
}

.result-score small {
  font-size: 22px;
  color: rgba(255, 255, 255, 0.64);
}

.review-list {
  display: grid;
  gap: 10px;
  max-height: 290px;
  overflow: auto;
  padding-right: 4px;
}

.review-item {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.9);
}

.review-item strong {
  display: block;
  margin-bottom: 8px;
  line-height: 1.35;
}

.review-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.review-meta span {
  padding: 6px 8px;
  border-radius: var(--radius);
  background: var(--surface-2);
}

.review-meta .ok {
  color: var(--good);
}

.review-meta .no {
  color: var(--bad);
}

.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 18px;
}

@media (max-width: 760px) {
  .app-shell {
    padding: 12px;
    place-items: stretch;
  }

  .quiz-panel {
    min-height: calc(100vh - 24px);
  }

  .app-header,
  .screen {
    padding-left: 18px;
    padding-right: 18px;
  }

  .app-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .intro-grid,
  .mode-list,
  .result-actions {
    grid-template-columns: 1fr;
  }

  .score-plate {
    min-height: 170px;
  }

  .mode-card {
    min-height: 126px;
  }

  .quiz-top,
  .quiz-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .timer,
  .secondary-btn {
    width: 100%;
  }

  .result-score span {
    font-size: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}