*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #181c24 0%, #283046 100%);
  color: #f4f4f4;
  font-family: 'Exo 2', 'Segoe UI', 'Roboto', 'Arial', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 0 10px;
  width: 100vw;
  box-sizing: border-box;
  overflow-x: hidden;
}

main {
  width: 100%;
  max-width: 480px;
  margin: 40px auto 0;
  background: rgba(36, 40, 54, 0.92);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 rgba(24, 28, 36, 0.37);
  border: 1.5px solid rgba(120, 130, 150, 0.18);
  backdrop-filter: blur(12px);
  padding: 32px 24px 24px;
  box-sizing: border-box;
  transition: padding 0.3s, max-width 0.3s;
}

h1 {
  font-size: 2.3rem;
  letter-spacing: 2px;
  margin: 32px 0 18px;
  background: linear-gradient(90deg, #b7bfc7, #6e8ca0, #3e5a73);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 16px #3e5a73;
  font-weight: 800;
}

.rules-container {
  background: rgba(36, 40, 54, 0.92);
  border-radius: 20px;
  border: 2px solid #6e8ca0;
  box-shadow: 0 2px 16px 0 #3e5a73;
  color: #f4f4f4;
  margin-bottom: 28px;
  padding: 18px 18px 10px;
  font-size: 1.08rem;
  transition: box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.rules-container[open] {
  box-shadow: 0 4px 32px 0 #3e5a73;
}

.rules-container summary {
  font-weight: 700;
  font-size: 1.15rem;
  color: #b7bfc7;
  cursor: pointer;
  outline: none;
  margin-bottom: 8px;
}

.rules-container ul {
  list-style: disc inside;
  margin: 8px 0 0 0;
  padding-left: 0;
}

.rules-container li {
  margin-bottom: 4px;
}

.score-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(36, 40, 54, 0.92);
  border-radius: 20px;
  border: 1.5px solid #6e8ca0;
  box-shadow: 0 2px 12px 0 #3e5a73;
  margin: 24px 0 18px;
  padding: 12px 18px;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 1px;
}

.score {
  color: #b7bfc7;
  font-size: 1.5rem;
  text-shadow: 0 1px 8px #6e8ca0;
}

.options-container {
  margin: 18px 0 0;
}

.options-container h2 {
  font-size: 1.2rem;
  margin-bottom: 14px;
  color: #6e8ca0;
  letter-spacing: 1px;
}

.btn-container {
  display: flex;
  justify-content: center;
  gap: 18px;
}

.btn {
  cursor: pointer;
  width: 110px;
  height: 48px;
  margin: 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: #232a34;
  background: linear-gradient(90deg, #b7bfc7, #6e8ca0, #3e5a73);
  background-size: 200% 200%;
  border: none;
  border-radius: 16px;
  box-shadow: 0 2px 16px 0 #3e5a73;
  transition: background-position 0.5s, transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  position: relative;
  z-index: 1;
}

.btn:hover, .btn:focus {
  background-position: right center;
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 4px 32px 0 #6e8ca0;
  color: #3e5a73;
}

#reset-game-btn {
  display: none;
  margin: 24px auto 0;
  width: 160px;
  height: 48px;
  font-size: 1.15rem;
  background: linear-gradient(90deg, #6e8ca0, #b7bfc7);
  color: #232a34;
  border-radius: 18px;
  box-shadow: 0 2px 16px 0 #b7bfc7;
}

#reset-game-btn:hover, #reset-game-btn:focus {
  background: linear-gradient(90deg, #b7bfc7, #6e8ca0);
  color: #3e5a73;
}

.results-container {
  font-size: 1.25rem;
  margin: 18px 0 0;
  min-height: 70px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#results-msg {
  color: #6e8ca0;
  font-weight: 600;
  margin-bottom: 8px;
  text-shadow: 0 1px 8px #3e5a73;
}

#winner-msg {
  margin-top: 10px;
  color: #3e5a73;
  font-size: 1.3rem;
  font-weight: 700;
  text-shadow: 0 2px 12px #6e8ca0;
}

/* --- Extra Styling for new features and dark/light mode --- */
.player-name-section {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}
.player-name-section input {
  border-radius: 8px;
  border: 1.5px solid #6e8ca0;
  padding: 6px 10px;
  font-size: 1rem;
  outline: none;
  margin-right: 4px;
  background: #232a34;
  color: #f4f4f4;
}
.player-name-section input:focus {
  border-color: #3e5a73;
  box-shadow: 0 0 6px #3e5a73;
}
.settings-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  background: rgba(36,40,54,0.85);
  border-radius: 12px;
  padding: 8px 12px;
  font-size: 1rem;
}
.settings-container label {
  font-weight: 600;
  color: #b7bfc7;
}
.settings-container select {
  border-radius: 8px;
  border: 1.5px solid #6e8ca0;
  padding: 4px 8px;
  font-size: 1rem;
  background: #232a34;
  color: #f4f4f4;
  outline: none;
}
.settings-container select:focus {
  border-color: #3e5a73;
  box-shadow: 0 0 6px #3e5a73;
}
.history-container, .leaderboard-container, .funfact-container {
  background: rgba(36,40,54,0.85);
  border-radius: 14px;
  margin: 18px 0 0;
  padding: 12px 14px 8px;
  box-shadow: 0 1px 8px #3e5a7333;
}
.history-container h3, .leaderboard-container h3, .funfact-container h3 {
  color: #b7bfc7;
  margin-bottom: 6px;
  font-size: 1.1rem;
  letter-spacing: 1px;
}
#history-list, #leaderboard-list {
  font-size: 0.98rem;
  margin: 0;
  padding-left: 18px;
}
#history-list li span {
  color: #6e8ca0;
}
#leaderboard-list li {
  color: #3e5a73;
}
#funfact {
  color: #6e8ca0;
  font-style: italic;
  margin-top: 4px;
}
#theme-toggle {
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  margin-left: 12px;
  color: #b7bfc7;
  transition: color 0.2s;
}
#theme-toggle:hover, #theme-toggle:focus {
  color: #3e5a73;
}
.light-mode {
  background: linear-gradient(135deg, #f4f6fa 0%, #dbe3ea 100%);
  color: #232a34;
}
.light-mode main,
.light-mode .rules-container,
.light-mode .score-container,
.light-mode .history-container,
.light-mode .leaderboard-container,
.light-mode .funfact-container,
.light-mode .settings-container {
  background: rgba(255,255,255,0.92);
  color: #232a34;
  box-shadow: 0 2px 16px 0 #b7bfc733;
}
.light-mode h1,
.light-mode .rules-container summary,
.light-mode .score,
.light-mode .settings-container label,
.light-mode .history-container h3,
.light-mode .leaderboard-container h3,
.light-mode .funfact-container h3 {
  color: #3e5a73;
}
.light-mode .btn {
  color: #232a34;
  background: linear-gradient(90deg, #b7bfc7, #6e8ca0, #3e5a73);
}
.light-mode .btn:hover, .light-mode .btn:focus {
  color: #3e5a73;
  background-position: right center;
}
.light-mode #theme-toggle {
  color: #3e5a73;
}

/* Responsive Typography */
html {
  font-size: 16px;
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }
  main {
    padding: 12px 2vw 8px;
    max-width: 100vw;
    margin: 16px 0 0 0;
    border-radius: 10px;
  }
  h1 {
    font-size: 1.4rem;
    margin: 18px 0 10px;
  }
  .rules-container,
  .score-container,
  .history-container,
  .leaderboard-container,
  .funfact-container,
  .settings-container {
    border-radius: 8px;
    padding: 8px 6px 6px;
    font-size: 0.98rem;
  }
  .btn-container {
    flex-direction: column;
    gap: 10px;
  }
  .btn {
    width: 100%;
    min-width: 0;
    height: 38px;
    font-size: 0.98rem;
    margin: 0;
  }
  #reset-game-btn {
    width: 100%;
    height: 38px;
    font-size: 1rem;
  }
  .player-name-section {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .player-name-section input {
    width: 100%;
    margin-right: 0;
  }
  .settings-container {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }
  .score-container {
    flex-direction: column;
    gap: 6px;
    padding: 8px 4px;
    font-size: 1rem;
  }
  .results-container {
    min-height: 40px;
    font-size: 1rem;
  }
  #results-msg, #winner-msg {
    font-size: 1rem;
  }
  #theme-toggle {
    font-size: 1.2rem;
    margin-left: 0;
    margin-top: 8px;
    align-self: flex-end;
  }
}

@media (max-width: 350px) {
  html {
    font-size: 13px;
  }
  main {
    padding: 4px 0 4px;
  }
}

/* Improve button and input touch targets */
.btn,
#reset-game-btn,
.player-name-section input,
.settings-container select {
  min-height: 38px;
  min-width: 44px;
  font-size: 1rem;
}

/* Make leaderboard and history scrollable on small screens */
#history-list,
#leaderboard-list {
  max-height: 120px;
  overflow-y: auto;
  word-break: break-word;
}

/* Ensure funfact and other containers wrap text */
#funfact {
  word-break: break-word;
}

/* Hide scrollbars for aesthetics on mobile */
#history-list,
#leaderboard-list {
  scrollbar-width: thin;
  scrollbar-color: #6e8ca0 #232a34;
}
#history-list::-webkit-scrollbar,
#leaderboard-list::-webkit-scrollbar {
  width: 6px;
  background: #232a34;
}
#history-list::-webkit-scrollbar-thumb,
#leaderboard-list::-webkit-scrollbar-thumb {
  background: #6e8ca0;
  border-radius: 4px;
}