:root {
  --accent: #6b7280;
  --text-color: #000000;
  --bg-color: #ffffff;
  --border-color: #000000;
  --shadow-color: #000000;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Poppins", sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}
.container {
  max-width: 90%;
  width: 800px;
  text-align: center;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
h1,
h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}
.button {
  background: var(--accent);
  border: 5px solid var(--border-color);
  box-shadow: 5px 5px 0 var(--shadow-color);
  padding: 12px 24px;
  font-size: 1.5rem;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  margin: 10px;
  text-transform: uppercase;
}
.button:hover {
  transform: scale(1.05);
  box-shadow: 10px 10px 0 var(--shadow-color);
}
.card {
  background: var(--bg-color);
  border: 5px solid var(--border-color);
  box-shadow: 5px 5px 0 var(--shadow-color);
  padding: 24px;
  margin: 20px 0;
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.problem {
  font-size: 3rem;
  margin-bottom: 20px;
}
.timer-bar {
  height: 20px;
  background: var(--accent);
  width: 100%;
  transition: width linear;
  border: 2px solid var(--border-color);
}
.glow-green {
  animation: glow-green 0.5s ease;
}
@keyframes glow-green {
  0% {
    box-shadow: 5px 5px 0 var(--shadow-color);
  }
  50% {
    box-shadow: 0 0 20px #00ff00;
    transform: scale(1.05);
  }
  100% {
    box-shadow: 5px 5px 0 var(--shadow-color);
  }
}
.glow-red {
  animation: glow-red 0.5s ease;
}
@keyframes glow-red {
  0% {
    box-shadow: 5px 5px 0 var(--shadow-color);
  }
  50% {
    box-shadow: 0 0 20px #ff0000;
    transform: scale(1.05);
  }
  100% {
    box-shadow: 5px 5px 0 var(--shadow-color);
  }
}
.shake {
  animation: shake 0.5s ease;
}
@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  50% {
    transform: translateX(5px);
  }
  75% {
    transform: translateX(-5px);
  }
}
.fade-in {
  animation: fade-in 0.5s ease;
}
@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  animation: fade-in 0.5s;
  z-index: 5;
}
#crown {
  font-size: 4rem;
  animation: bounce 1s infinite;
}
@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}
#streak-banner {
  position: fixed;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  background: #ffff00;
  border: 3px solid var(--border-color);
  box-shadow: 5px 5px 0 var(--shadow-color);
  padding: 12px 24px;
  display: none;
  font-size: 1.5rem;
}
.flame {
  animation: flame 0.5s infinite;
}
@keyframes flame {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}
#info-modal,
#leaderboard-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 600px;
  background: var(--bg-color);
  border: 5px solid var(--border-color);
  box-shadow: 5px 5px 0 var(--shadow-color);
  padding: 24px;
  display: none;
  z-index: 10;
  text-align: left;
}
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: none;
  z-index: 4;
}
input[type="number"] {
  font-size: 2rem;
  text-align: center;
  border: 3px solid var(--border-color);
  padding: 8px;
  width: 80%;
  max-width: 200px;
  margin-bottom: 20px;
  background: var(--bg-color);
}
label {
  font-size: 1.2rem;
  margin: 10px 0;
  display: block;
}
select {
  font-size: 1.2rem;
  padding: 8px;
  border: 3px solid var(--border-color);
  background: var(--bg-color);
  margin-bottom: 20px;
}
#scores {
  font-size: 1.5rem;
  margin-bottom: 10px;
  width: 100%;
  display: flex;
  justify-content: space-around;
}
#current-turn {
  font-size: 1.5rem;
  margin: 10px 0;
}
#ai-timer-container {
  width: 100%;
  max-width: 600px;
  margin-top: 20px;
  text-align: left;
}
ul {
  list-style: none;
  padding: 0;
}
li {
  font-size: 1.2rem;
  margin: 5px 0;
}
@media (max-width: 768px) {
  h1,
  h2 {
    font-size: 2rem;
  }
  .problem {
    font-size: 2.5rem;
  }
  .button {
    font-size: 1.2rem;
    padding: 10px 20px;
  }
  input[type="number"] {
    font-size: 1.5rem;
  }
  #scores,
  #current-turn {
    font-size: 1.2rem;
  }
}
@media (max-width: 480px) {
  h1,
  h2 {
    font-size: 1.5rem;
  }
  .problem {
    font-size: 2rem;
  }
  .button {
    font-size: 1rem;
    padding: 8px 16px;
    margin: 5px;
  }
  input[type="number"] {
    font-size: 1.2rem;
    width: 100%;
  }
  #scores,
  #current-turn {
    font-size: 1rem;
  }
  .card {
    padding: 16px;
  }
}
/* Universal Home Button Styling */
.home-button {
  position: fixed;
  top: 20px;
  left: 20px;
  background: #ffffff;
  color: #000000;
  text-decoration: none;
  padding: 12px 18px;
  border: 4px solid #000000;
  box-shadow: 6px 6px 0 #808080;
  font-family: "Arial Black", Arial, sans-serif;
  font-size: 0.9rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer;
  user-select: none;
}

.home-button:hover {
  background: #000000;
  color: #ffffff;
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 #808080;
}

.home-button:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #808080;
}