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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 1200px;
    width: 90%;
    text-align: center;
}

header {
    margin-bottom: 60px;
}

#dayTitle {
    font-size: 72px;
    font-weight: bold;
    color: #2196F3;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.type {
    font-size: 36px;
    color: #4CAF50;
    font-weight: 500;
}

.exercise-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 60px 40px;
    margin-bottom: 60px;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

#exerciseDescription {
    font-size: 64px;
    font-weight: bold;
    color: white;
    line-height: 1.2;
}

.video-section {
    margin-bottom: 40px;
}

.watch-btn {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
    border: none;
    padding: 25px 60px;
    font-size: 32px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 8px 16px rgba(76, 175, 80, 0.3);
}

.watch-btn:hover,
.watch-btn:focus {
    transform: scale(1.05);
    box-shadow: 0 12px 24px rgba(76, 175, 80, 0.4);
    outline: 3px solid #81c784;
    outline-offset: 3px;
}

.btn-icon {
    font-size: 40px;
}

.no-video-section {
    margin-bottom: 40px;
}

.no-video {
    font-size: 36px;
    color: #ff9800;
    font-weight: 500;
}

.install-section {
    margin-bottom: 40px;
}

.install-btn {
    background: linear-gradient(135deg, #2196F3 0%, #1976D2 100%);
    color: white;
    border: none;
    padding: 20px 50px;
    font-size: 28px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 8px 16px rgba(33, 150, 243, 0.3);
}

.install-btn:hover,
.install-btn:focus {
    transform: scale(1.05);
    box-shadow: 0 12px 24px rgba(33, 150, 243, 0.4);
    outline: 3px solid #64b5f6;
    outline-offset: 3px;
}

/* TV-specific optimizations */
@media (min-width: 1920px) {
    #dayTitle {
        font-size: 96px;
    }
    
    .type {
        font-size: 48px;
    }
    
    #exerciseDescription {
        font-size: 80px;
    }
    
    .watch-btn {
        font-size: 40px;
        padding: 30px 80px;
    }
}

/* Focus styles for keyboard navigation */
button:focus {
    outline: 3px solid #2196F3;
    outline-offset: 3px;
}

/* Responsive design */
@media (max-width: 768px) {
    #dayTitle {
        font-size: 48px;
    }
    
    .type {
        font-size: 24px;
    }
    
    #exerciseDescription {
        font-size: 36px;
    }
    
    .watch-btn {
        font-size: 24px;
        padding: 20px 40px;
    }
    
    .exercise-card {
        padding: 40px 20px;
    }
}