/* Global Styles */
:root {
    --primary-color: #4a6fa5;
    --coke-color: #e74c3c;
    --fanta-color: #f39c12;
    --water-color: #3498db;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-color: #333333;
    --border-radius: 12px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 25px;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

/* Can Buttons Section */
.can-buttons {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.can-button {
    flex: 1;
    min-width: 250px;
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 25px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.can-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

#coke-zero {
    border-top: 5px solid var(--coke-color);
}

#fanta-zero {
    border-top: 5px solid var(--fanta-color);
}

#sparkling-water {
    border-top: 5px solid var(--water-color);
}

.can-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

#coke-zero .can-icon {
    color: var(--coke-color);
}

#fanta-zero .can-icon {
    color: var(--fanta-color);
}

#sparkling-water .can-icon {
    color: var(--water-color);
}

.can-button h2 {
    margin-bottom: 15px;
    font-size: 1.6rem;
}

.can-button p {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.add-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.add-btn:hover {
    background-color: #3a5a8c;
    transform: scale(1.05);
}

/* Summary Section */
.summary-section {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--box-shadow);
}

.summary-section h2 {
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.8rem;
    color: var(--primary-color);
}

.summary-content {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.summary-card {
    flex: 1;
    min-width: 200px;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
}

.summary-card h3 {
    margin-bottom: 15px;
    font-size: 1.4rem;
    color: var(--primary-color);
}

.summary-card p {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
}

.summary-details {
    flex: 2;
    min-width: 300px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 15px;
    border-bottom: 1px solid #eee;
    font-size: 1.2rem;
}

.summary-item:last-child {
    border-bottom: none;
}

.drink-label {
    font-weight: 600;
    padding-left: 10px;
    border-left: 4px solid;
}

.drink-label.coke {
    border-color: var(--coke-color);
}

.drink-label.fanta {
    border-color: var(--fanta-color);
}

.drink-label.water {
    border-color: var(--water-color);
}

/* Animation for button clicks */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 0.5s ease-in-out;
}

/* Responsive Design */
@media (max-width: 768px) {
    .can-buttons {
        flex-direction: column;
    }
    
    .can-button {
        width: 100%;
    }
    
    .summary-content {
        flex-direction: column;
    }
}