/* Custom Styles */
body {
    font-family: 'Sarabun', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f8ff; /* สีพื้นหลังโทนอ่อนให้ดูสบายตา */
}

/* Navbar */
.navbar {
    background-color: #007bff;
}

/* Card สถิติ */
.stat-card {
    border-radius: 10px;
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}
.stat-card:hover {
    transform: translateY(-5px);
}
.stat-card .icon {
    font-size: 3rem;
    opacity: 0.8;
}

/* โหมดเรียน */
.mode-card {
    cursor: pointer;
    text-align: center;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    background: white;
}
.mode-card:hover {
    transform: scale(1.05);
}
.mode-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    background: #e9ecef;
}

/* Start Screen */
.start-screen-bg {
    background: linear-gradient(135deg, #74ebd5 0%, #9face6 100%);
    padding: 3rem 0;
    border-radius: 20px;
    color: white;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* Leaderboard */
.leaderboard-list .list-group-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.medal {
    font-size: 1.5rem;
}
.medal-gold { color: #FFD700; }
.medal-silver { color: #C0C0C0; }
.medal-bronze { color: #CD7F32; }

/* Game UI */
.game-container {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.word-display {
    font-size: 3rem;
    font-weight: bold;
    color: #333;
    text-align: center;
    margin: 2rem 0;
}
.timer-bar {
    height: 10px;
    background-color: #28a745;
    transition: width 1s linear, background-color 0.3s;
}