:root {
  --bg: #0b0f14;
  --card: #0f1720;
  --accent: #16a34a;
  --text: #e6eef3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(135deg, #0b1410, #000);
  color: var(--text);
  font-family: "Segoe UI", Roboto, "Courier New", monospace;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
}

.menu {
  text-align: center;
  margin-top: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.menu p {
  margin: 10px 0;
  font-size: 18px;
  font-weight: 500;
}

.menu button {
  margin: 8px;
  padding: 10px 16px;
  font-size: 16px;
  border-radius: 8px;
  background: var(--accent);
  color: #021;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
  border: none;
}

.menu button:hover {
  background: #22c55e;
  transform: scale(1.05);
}


.stats {
  margin-top: 20px;
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 180px);
  gap: 25px;
  justify-content: center;
  margin-top: 30px;
}

.card {
  position: relative;
  width: 180px;
  height: 120px;
  border-radius: 12px;
  background: var(--card);
  cursor: pointer;
  perspective: 800px;
  text-align: center;
  font-size: 15px;
  color: #fff;
  user-select: none;
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: transform 0.25s ease, box-shadow 0.3s ease;
}

.card:hover {
  box-shadow: 0 0 10px rgba(22, 163, 74, 0.4);
  transform: scale(1.04);
}

.card .front,
.card .back {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
  border-radius: 10px;
  transition: transform 0.45s ease, opacity 0.3s ease;
  padding: 10px;
}

.card .front {
  transform: rotateY(0deg);
  background: rgba(255, 255, 255, 0.03);
  color: #cbd5e1;
  font-weight: 600;
  z-index: 2;
}

.card .back {
  transform: rotateY(-180deg);
  font-size: 14px;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  z-index: 1;
}

.card.flipped .front {
  transform: rotateY(180deg);
  opacity: 0;
}

.card.flipped .back {
  transform: rotateY(0deg);
  opacity: 1;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.top-bar {
  width: 100%;
  max-width: 900px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
}

.popup {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(22, 163, 74, 0.95);
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  animation: fade 2s ease;
}

@keyframes fade {
  from {opacity: 0;}
  to {opacity: 1;}
}

.hidden {
  display: none;
}

@media (max-width: 800px) {
  .grid {
    grid-template-columns: repeat(3, 140px);
    gap: 18px;
  }
  .card {
    width: 140px;
    height: 100px;
    font-size: 14px;
  }
}
select {
  padding: 8px 12px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #021;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  outline: none;
  margin-top: 5px;
  transition: 0.3s;
}

select:hover {
  background: #22c55e;
}
/* 🧠 QUIZ MODE STYLING */
#game-board h2 {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 25px;
  text-align: center;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
}

.quiz-options .opt {
  background: #111827;
  color: #f3f4f6;
  border: 2px solid #22c55e;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  min-width: 90px;
}

.quiz-options .opt:hover {
  background: #22c55e;
  color: #000;
  transform: scale(1.05);
}

#score {
  font-weight: 600;
  color: #f3f4f6;
  font-size: 16px;
}
#game-board h2 {
  color: #22c55e;
  font-size: 24px;
  text-align: center;
  margin-bottom: 10px;
}

#game-board p {
  text-align: center;
  color: #fff;
}

.quiz-options button.opt {
  background: #111827;
  color: #fff;
  border: 2px solid #22c55e;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}

.quiz-options button.opt:hover {
  background: #22c55e;
  color: #000;
}
/* 💬 Motivational Quote Popup */
.motivation-popup {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #22c55e;
  color: #000;
  padding: 15px 25px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  font-weight: 700;
  font-size: 16px;
  animation: slideUp 6s ease-in-out forwards;
  z-index: 9999;
}

@keyframes slideUp {
  0% { opacity: 0; transform: translateY(40px); }
  10% { opacity: 1; transform: translateY(0); }
  90% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(20px); }
}