/* style.css */
body {
    font-family: 'Sarabun', sans-serif;
    background-color: #f8f9fa;
    color: #333;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar {
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.card {
    border-radius: 15px;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.btn-primary {
    background-color: #4e54c8;
    border-color: #4e54c8;
}

.btn-primary:hover {
    background-color: #3f449e;
    border-color: #3f449e;
}

.vocab-card {
    cursor: pointer;
    text-align: center;
    padding: 20px;
}

.vocab-word {
    font-size: 1.5rem;
    font-weight: 600;
    color: #4e54c8;
}

.vocab-pronunciation {
    font-size: 1.1rem;
    color: #6c757d;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.vocab-card:hover .vocab-pronunciation {
    opacity: 1;
}

/* Gamification Elements */
.xp-badge {
    background: linear-gradient(45deg, #ffd700, #ffb300);
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(255, 215, 0, 0.4);
}

.level-card {
    background: white;
    border-radius: 15px;
    text-align: center;
    padding: 30px;
    position: relative;
    overflow: hidden;
}

.level-card.locked {
    background: #e9ecef;
    color: #adb5bd;
}

.level-card.locked::after {
    content: '\f023';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: rgba(0,0,0,0.1);
}

.timer-bar {
    height: 10px;
    background-color: #e9ecef;
    border-radius: 5px;
    margin-bottom: 20px;
    overflow: hidden;
}

.timer-fill {
    height: 100%;
    background-color: #28a745;
    width: 100%;
    transition: width 1s linear, background-color 0.5s ease;
}

/* Hall of Fame */
.medal-gold { color: #FFD700; }
.medal-silver { color: #C0C0C0; }
.medal-bronze { color: #CD7F32; }

/* Responsive text */
@media (max-width: 768px) {
    .vocab-word { font-size: 1.2rem; }
    h1 { font-size: 1.8rem; }
}