* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

.navbar {
  width: 100%;
  background-color: #e3f2fd; /* light blue */
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
}
.logo { color: #0d47a1; font-weight: 700; font-size: 1.2rem; }
.nav-links { display: flex; gap: 16px; }
.nav-link {
  color: #0d47a1;
  text-decoration: none;
  font-size: 1rem;
  padding: 6px 8px;
  border-radius: 6px;
}
.nav-link:hover { background: rgba(13,71,161,0.06); }


.page-layout {
  display: flex;
  height: calc(100vh - 60px); 
}

.sidebar {
  width: 250px;
  background-color: #e3f2fd;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}
.timer-block {
  background-color: #fff;
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
}
.timer-block h2 { text-align: center; margin-bottom: 10px; }
.time { font-size: 2rem; text-align: center; margin-bottom: 10px; }
.controls { display: flex; justify-content: space-around; }
.controls button {
  font-size: 1.2rem;
  cursor: pointer;
  background-color: #90caf9;
  border: none;
  padding: 5px 10px;
  border-radius: 5px;
}
.controls button:hover { background-color: #42a5f5; }


.main-content {
  flex: 1;
  padding: 40px;
  background-color: #fff;
  overflow-y: auto;
}


.card {
  background-color: rgb(249, 253, 255);
  border-radius: 10px;
  padding: 15px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  max-width: 500px;
  margin-top: 20px;
}
.card-container {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}


#bubble-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fill, 40px);
  gap: 5px;
  justify-content: center;
  max-width: 800px;
  padding: 2px;
}
.bubble {
  width: 50px;
  height: 50px;
  background-image: url('bubble.png');
  background-size: cover;
  background-repeat: no-repeat;
  cursor: pointer;
  transition: opacity 0.2s ease;
}
.bubble.popped {
  background-image: none;
  opacity: 0;
  pointer-events: none;
}

#reset-bubbles {
  background-color: #42a5f5;
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  margin-bottom: 10px;
  cursor: pointer;
}
#reset-bubbles:hover { background-color: #1e88e5; }


.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 80px); 
  gap: 10px;
  justify-content: center;
  margin: 15px auto;
}

#memory-card {
  width: 400px;
  min-height: 450px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
}

.memory-tile {
  width: 80px;
  height: 80px;
  background-color: #90caf9;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.3s;
}

.memory-tile.flipped {
  background-color: #e3f2fd;
}

.memory-tile.matched {
  background-color: #66bb6a;
  cursor: default;
}

#reset-memory {
  background-color: #42a5f5;
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  margin-bottom: 10px;
  cursor: pointer;
}
#reset-memory:hover {background-color: #1e88e5;}