:root {
  --bg-color: #0b0f19;
  --panel-bg: rgba(20, 25, 40, 0.6);
  --panel-border: rgba(255, 255, 255, 0.1);
  --primary: #00f0ff;
  --secondary: #7000ff;
  --correct: #00ff88;
  --incorrect: #ff0055;
  --text-light: #ffffff;
  --text-muted: #a0a5b5;
  --font-family: 'Outfit', sans-serif;
}

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

body {
  font-family: var(--font-family);
  background: var(--bg-color);
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(112, 0, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(0, 240, 255, 0.1) 0%, transparent 50%);
  color: var(--text-light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  flex: 1;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  animation: fadeInDown 0.8s ease-out;
}

.logo h1 {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

.subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 300;
  letter-spacing: 1px;
  text-transform: uppercase;
}

#score-container {
  text-align: right;
  background: var(--panel-bg);
  padding: 1rem 2rem;
  border-radius: 16px;
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.score-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.score-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--correct);
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.4);
}

.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

#board-container {
  flex: 1;
  display: flex;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

#board {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  padding: 15px;
  width: 100%;
}

.category-header {
  text-align: center;
  padding: 1rem 0.5rem;
  font-weight: 700;
  font-size: 1.2rem;
  text-transform: uppercase;
  color: var(--primary);
  border-bottom: 2px solid rgba(0, 240, 255, 0.2);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.tile {
  background: rgba(30, 36, 56, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2.2rem;
  font-weight: 700;
  color: #ffd700; /* Gold */
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.tile::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s;
}

.tile:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5), 0 0 15px rgba(255, 215, 0, 0.3);
  border-color: rgba(255, 215, 0, 0.5);
}

.tile:hover::before {
  opacity: 1;
}

.tile.answered {
  background: rgba(10, 12, 20, 0.5);
  color: transparent;
  text-shadow: none;
  cursor: default;
  pointer-events: none;
  border-color: transparent;
  box-shadow: none;
}

/* Modal Styles */
.modal {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  opacity: 1;
  transition: opacity 0.3s;
}

.modal.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-backdrop {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 700px;
  padding: 3rem;
  transform: scale(1);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  text-align: center;
}

.modal.hidden .modal-content {
  transform: scale(0.9);
}

.modal-content.glow {
  box-shadow: 0 0 50px rgba(112, 0, 255, 0.2), inset 0 0 20px rgba(0, 240, 255, 0.1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 1rem;
}

.modal-header h2 {
  font-size: 1.5rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.neon-text {
  font-size: 2rem;
  font-weight: 700;
  color: #ffd700;
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.modal-body p {
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 2.5rem;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.option-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.2rem;
  border-radius: 12px;
  color: var(--text-light);
  font-size: 1.1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  display: flex;
  align-items: center;
}

.option-btn:hover {
  background: rgba(0, 240, 255, 0.1);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.option-btn.correct-reveal {
  background: rgba(0, 255, 136, 0.2);
  border-color: var(--correct);
  color: var(--correct);
}

.option-btn.wrong-reveal {
  background: rgba(255, 0, 85, 0.2);
  border-color: var(--incorrect);
  color: var(--incorrect);
  opacity: 0.7;
}

.feedback-box {
  margin-top: 2rem;
  padding: 1.5rem;
  border-radius: 12px;
  animation: fadeIn 0.5s;
}

.feedback-box.correct {
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.3);
}

.feedback-box.incorrect {
  background: rgba(255, 0, 85, 0.1);
  border: 1px solid rgba(255, 0, 85, 0.3);
}

#feedback-title {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.correct #feedback-title { color: var(--correct); }
.incorrect #feedback-title { color: var(--incorrect); }

#feedback-remark {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.btn {
  padding: 1rem 2rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.primary-btn {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: 0 4px 15px rgba(112, 0, 255, 0.4);
}

.primary-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(112, 0, 255, 0.6);
}

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }

/* Responsive */
@media (max-width: 900px) {
  #board { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 600px) {
  .logo h1 { font-size: 2.5rem; }
  #board { grid-template-columns: repeat(2, 1fr); }
  .options-grid { grid-template-columns: 1fr; }
  .modal-content { padding: 2rem 1.5rem; }
}