:root {
  color-scheme: dark;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --bg: #101223;
  --panel: rgba(255, 255, 255, 0.1);
  --panel-strong: rgba(255, 255, 255, 0.16);
  --text: #f7f8ff;
  --muted: #b8bddb;
  --accent: #8bf5cf;
  --accent-strong: #47dca9;
  --danger: #ff7d9c;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(139, 245, 207, 0.25), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(255, 125, 156, 0.18), transparent 28rem),
    var(--bg);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  font: inherit;
  cursor: pointer;
}

main {
  width: min(92vw, 1000px);
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.site-header {
  width: min(92vw, 1000px);
  margin: 0 auto;
  padding: 1.25rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  color: var(--accent);
  font-weight: 900;
  letter-spacing: 0.04em;
}

.site-header nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--muted);
  font-weight: 700;
}

.site-header nav a:hover,
.logout-button:hover {
  color: var(--text);
}

.logout-button {
  padding: 0;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
}

.home,
.cta-card,
.game {
  padding: clamp(1.25rem, 4vw, 3rem);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.06));
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  text-align: center;
}

.home {
  min-height: 62vh;
  display: grid;
  place-items: center;
  align-content: center;
}

.hero {
  margin-bottom: 2rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 5rem);
  line-height: 0.95;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
}

.intro {
  max-width: 38rem;
  margin: 1rem auto 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.play-link {
  display: inline-block;
  margin-top: 1.75rem;
  padding: 0.95rem 1.35rem;
  border-radius: 999px;
  background: var(--accent);
  color: #092118;
  font-weight: 900;
  box-shadow: 0 12px 30px rgba(71, 220, 169, 0.25);
  transition:
    transform 160ms ease,
    box-shadow 160ms ease;
}

.play-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(71, 220, 169, 0.3);
}

.game-list,
.how-to-play {
  margin: 2rem 0;
  text-align: center;
}

.cta-card {
  text-align: center;
}

.cta-card p {
  max-width: 34rem;
  margin: 0.75rem auto 0;
  color: var(--muted);
}

.game-cards,
.rule-cards {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.game-cards {
  grid-template-columns: repeat(3, 1fr);
}

.rule-cards {
  grid-template-columns: repeat(3, 1fr);
}

.game-cards article,
.rule-cards article {
  padding: 1.25rem;
  border-radius: 22px;
  background: var(--panel);
}

.game-cards h3,
.rule-cards h3 {
  margin: 0;
  font-size: 1.35rem;
}

.game-cards p,
.rule-cards p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.game-cards .play-link {
  margin-top: 1rem;
}

.instructions {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  border-radius: 22px;
  background: var(--panel);
  text-align: left;
}

.instructions h2 {
  font-size: 1.5rem;
  text-align: center;
}

.instructions ul {
  max-width: 34rem;
  margin: 1rem auto 0;
  padding-left: 1.25rem;
  color: var(--muted);
  line-height: 1.6;
}

.scoreboard,
.arena,
.buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.scoreboard {
  margin-bottom: 1.5rem;
}

.scoreboard article,
.choice-card {
  flex: 1;
  padding: 1rem;
  border-radius: 22px;
  background: var(--panel);
}

.scoreboard span {
  display: block;
  font-size: 2.75rem;
  font-weight: 900;
}

.scoreboard p,
.choice-card p {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

.arena {
  margin: 1.5rem 0;
}

.choice-card strong {
  display: block;
  min-height: 4.5rem;
  font-size: 3.5rem;
}

.versus {
  margin: 0;
  color: var(--accent);
  font-weight: 900;
  text-transform: uppercase;
}

.result {
  min-height: 2rem;
  margin: 1rem 0 1.5rem;
  font-size: 1.2rem;
  font-weight: 800;
}

.buttons {
  flex-wrap: wrap;
}

.guess-form {
  max-width: 28rem;
  margin: 0 auto;
  text-align: left;
}

.login-card {
  max-width: 42rem;
  margin: 0 auto;
}

.login-form {
  display: grid;
  gap: 0.85rem;
  max-width: 28rem;
  margin: 2rem auto 0;
  text-align: left;
}

.guess-form label,
.login-form label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--muted);
  font-weight: 800;
}

.guess-controls {
  display: flex;
  gap: 0.75rem;
}

.guess-controls input,
.login-form input {
  width: 100%;
  min-width: 0;
  padding: 0.9rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
}

.attempts {
  margin: 0;
  color: var(--muted);
}

.arcade-stats {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-weight: 800;
}

.arcade-stats p {
  margin: 0;
}

.arcade-board {
  width: 100%;
  max-width: 576px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 18px;
  background: #080a16;
  box-shadow: inset 0 0 30px rgba(139, 245, 207, 0.12);
}

.arcade-controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.buttons button,
.arcade-controls button,
.guess-controls button,
.login-form button,
.reset {
  border-radius: 999px;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.buttons button,
.arcade-controls button,
.guess-controls button,
.login-form button {
  min-width: 9rem;
  padding: 0.9rem 1.25rem;
  background: var(--accent);
  color: #092118;
  font-weight: 900;
  box-shadow: 0 12px 30px rgba(71, 220, 169, 0.25);
}

.buttons button:hover,
.arcade-controls button:hover,
.guess-controls button:hover,
.login-form button:hover,
.reset:hover {
  transform: translateY(-2px);
}

.buttons button:active,
.arcade-controls button:active,
.guess-controls button:active,
.login-form button:active,
.reset:active {
  transform: translateY(0);
}

.reset {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--panel-strong);
  color: var(--text);
}

.result.win {
  color: var(--accent);
}

.result.lose {
  color: var(--danger);
}

.result.draw {
  color: var(--muted);
}

@media (max-width: 620px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .game-cards,
  .rule-cards {
    grid-template-columns: 1fr;
  }

  .guess-controls {
    flex-direction: column;
  }

  .arcade-controls,
  .arcade-stats {
    flex-direction: column;
  }

  .scoreboard,
  .arena {
    flex-direction: column;
  }

  .scoreboard article,
  .choice-card {
    width: 100%;
  }
}