:root {
  color-scheme: light;
  --bg-start: #8ec5fc;
  --bg-end: #e0c3fc;
  --panel: rgba(255, 255, 255, 0.92);
  --panel-border: rgba(255, 255, 255, 0.55);
  --text: #1f2553;
  --muted: #57608f;
  --accent: #ff7a59;
  --accent-dark: #ef5b35;
  --accent-soft: rgba(255, 122, 89, 0.14);
  --success: #2f9e44;
  --shadow: 0 24px 60px rgba(53, 62, 120, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Fredoka", system-ui, sans-serif;
  background: linear-gradient(145deg, var(--bg-start), var(--bg-end));
  color: var(--text);
}

button {
  font: inherit;
}

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

.screen {
  display: none;
  width: min(100%, 900px);
}

.screen--active {
  display: block;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero-panel,
.result-panel {
  padding: 48px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  font-size: clamp(2.4rem, 5vw, 4.4rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.subtitle {
  margin: 0 auto;
  max-width: 560px;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.6;
}

.player-card {
  max-width: 560px;
  margin: 28px auto 0;
  padding: 20px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.78);
  text-align: left;
}

.input-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.player-input {
  width: 100%;
  padding: 15px 18px;
  border: 2px solid rgba(87, 96, 143, 0.16);
  border-radius: 18px;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: white;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.player-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 122, 89, 0.16);
}

.input-help,
.input-error {
  margin: 10px 0 0;
  font-size: 0.95rem;
}

.input-help {
  color: var(--muted);
}

.input-error {
  color: var(--accent-dark);
  font-weight: 500;
}

.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-top: 32px;
}

.menu-actions {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.difficulty-card,
.answer-button,
.action-button {
  border: none;
  border-radius: 24px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.difficulty-card {
  padding: 24px;
  text-align: left;
  background: white;
  box-shadow: 0 10px 24px rgba(79, 90, 140, 0.12);
}

.difficulty-card:hover,
.answer-button:hover,
.action-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(79, 90, 140, 0.16);
}

.difficulty-card__label {
  display: block;
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.difficulty-card__detail {
  color: var(--muted);
  line-height: 1.5;
}

.game-panel {
  padding: 28px;
}

.game-header {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.game-header > div {
  padding: 18px 20px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.85);
}

.stat-label {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.95rem;
}

.stat-value {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
}

.timer {
  color: var(--accent-dark);
}

.question-card {
  padding: 28px;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(243, 247, 255, 0.95));
}

.progress-text {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 10px;
}

.question-text {
  margin-bottom: 28px;
}

.answers-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.answer-button {
  min-height: 82px;
  padding: 18px;
  background: white;
  font-size: clamp(1.35rem, 3vw, 1.8rem);
  font-weight: 600;
  color: var(--text);
}

.answer-button.correct {
  background: rgba(47, 158, 68, 0.16);
  color: var(--success);
}

.answer-button.wrong {
  background: rgba(239, 91, 53, 0.16);
  color: var(--accent-dark);
}

.result-score {
  margin: 16px 0 10px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
}

.result-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.leaderboard-panel {
  margin-top: 32px;
  padding: 24px;
  border-radius: 28px;
  text-align: left;
  background: rgba(255, 255, 255, 0.78);
}

.leaderboard-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
}

.leaderboard-eyebrow {
  margin-bottom: 4px;
}

.leaderboard-header h3 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.leaderboard-status {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.leaderboard-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.leaderboard-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border-radius: 20px;
  background: white;
  box-shadow: 0 10px 24px rgba(79, 90, 140, 0.08);
}

.leaderboard-item--highlight {
  outline: 3px solid rgba(255, 122, 89, 0.22);
  background: rgba(255, 122, 89, 0.08);
}

.leaderboard-rank {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-weight: 700;
}

.leaderboard-name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.leaderboard-meta {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.leaderboard-points {
  text-align: right;
}

.leaderboard-score {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
}

.leaderboard-score-label {
  color: var(--muted);
  font-size: 0.88rem;
}

.leaderboard-empty {
  padding: 18px;
  border-radius: 18px;
  text-align: center;
  color: var(--muted);
  background: white;
}

.action-button {
  padding: 14px 24px;
  background: var(--accent);
  color: white;
  font-weight: 600;
}

.action-button--secondary {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.exit-game-link {
  position: fixed;
  top: 28px;
  right: 32px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--accent-dark);
  font: inherit;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.2em;
  cursor: pointer;
}

.exit-game-link:hover {
  color: var(--text);
}

@media (max-width: 640px) {
  .hero-panel,
  .result-panel,
  .game-panel,
  .question-card {
    padding: 22px;
  }

  .player-card,
  .leaderboard-panel {
    padding: 18px;
  }

  .game-header,
  .answers-grid {
    grid-template-columns: 1fr;
  }

  .leaderboard-header,
  .leaderboard-item {
    grid-template-columns: 1fr;
  }

  .leaderboard-points {
    text-align: left;
  }

  .exit-game-link {
    top: 16px;
    right: 20px;
  }
}