/* Modern CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Custom Properties */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #f8fafc;
    --accent-color: #f59e0b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --red-600: #dc2626;
    --green-600: #16a34a;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header img {
    height: 40px;
    margin: 0 1rem;
    transition: var(--transition);
}

.header img:hover {
    transform: scale(1.05);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Filter Container */
.filter-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin: 2rem 0;
}

.filter-button {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    min-width: 100px;
    text-align: center;
}

.filter-button:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.filter-button.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-dark);
    box-shadow: var(--shadow-lg);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

/* Card */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

.card-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: var(--transition);
}

.card:hover .card-header::before {
    transform: translateX(100%);
}

.card-header.turkey {
    background: linear-gradient(135deg, var(--red-600) 0%, #991b1b 100%);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.3;
}

/* Card Content */
.card-content {
    padding: 1.5rem;
}

.card-section {
    margin-bottom: 1.5rem;
}

.card-section:last-child {
    margin-bottom: 0;
}

.section-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.divider {
    height: 2px;
    background: linear-gradient(90deg, var(--gray-200) 0%, var(--gray-300) 50%, var(--gray-200) 100%);
    border-radius: 1px;
    margin: 1rem 0;
}

/* Countries List */
.countries ul {
    list-style: none;
    padding: 0;
}

.countries li {
    padding: 0.5rem 0;
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    padding-left: 1.5rem;
}

.countries li::before {
    content: '📍';
    position: absolute;
    left: 0;
    top: 0.5rem;
}

/* Data Info */
.data-info {
    background: var(--gray-50);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
    margin: 1rem 0;
}

.data-info p {
    margin: 0;
    font-weight: 600;
    color: var(--text-primary);
}

/* Price and Buy Container */
.price-buy-container {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    padding: 1.25rem;
    border-radius: var(--border-radius-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1.5rem 0;
    border: 1px solid var(--gray-200);
}

.price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.price::before {
    content: '€';
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    min-width: 100px;
    position: relative;
    overflow: hidden;
}

.button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.button:hover::before {
    left: 100%;
}

.button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.button:active {
    transform: translateY(0);
}

.buy-button {
    background: linear-gradient(135deg, var(--green-600) 0%, #15803d 100%);
}

/* Info Section */
.info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--border-radius);
    margin-top: 1rem;
}

.info span {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info img {
    height: 24px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* Advertisement */
.advertisement {
    margin: 3rem auto;
    max-width: 100%;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
}

.advertisement:hover {
    transform: scale(1.02);
}

.advertisement img {
    width: 100%;
    height: auto;
    display: block;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--white);
    margin: 5% auto;
    padding: 2rem;
    border-radius: var(--border-radius-xl);
    width: 90%;
    max-width: 500px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.underline-bold {
    font-weight: 700;
    text-decoration: underline;
    color: var(--primary-color);
}

.confirm {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.confirm:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--gray-200);
    margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header img {
        height: 32px;
        margin: 0 0.5rem;
    }
    
    .filter-container {
        gap: 0.5rem;
        margin: 1.5rem 0;
    }
    
    .filter-button {
        padding: 0.625rem 1rem;
        font-size: 0.8rem;
        min-width: 80px;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .card-content {
        padding: 1.25rem;
    }
    
    .price-buy-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .price {
        font-size: 1.25rem;
    }
    
    .button {
        width: 100%;
        padding: 0.875rem;
    }
    
    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
        width: 95%;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.75rem 0;
    }
    
    .header img {
        height: 28px;
        margin: 0 0.25rem;
    }
    
    .filter-button {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
        min-width: 70px;
    }
    
    .card-title {
        font-size: 1.125rem;
    }
    
    .price {
        font-size: 1.125rem;
    }
    
    .info {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .modal-content {
        margin: 15% auto;
        padding: 1.25rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-200);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus States */
button:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .filter-container,
    .advertisement,
    .footer {
        display: none;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}