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

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}

header {
    background-color: white;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.logo {
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo img {
    max-height: 100px;
    width: auto;
}

.content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.page-content {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    padding: 20px;
    max-width: 1400px;
    margin: 0 auto;
}

.grid-item {
    background-color: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.grid-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    border-color: #3498db;
    background-color: #ffffff;
}

.grid-item a {
    text-decoration: none;
    color: #333;
    font-size: 18px;
    font-weight: bold;
}

.grid-item:hover a {
    color: #3498db;
}

/* Tab sistemi */
.tab-container {
    margin: 20px 0;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    gap: 10px;
}

.tab-btn {
    background: #ecf0f1;
    color: #34495e;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.tab-btn.active {
    background: #3498db;
    color: white;
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
    transform: translateY(-2px);
}

.tab-btn:hover:not(.active) {
    background: #bdc3c7;
    transform: translateY(-1px);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.tab-content.active {
    display: block;
}

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

.offline-info {
    background: #27ae60;
    color: white;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(39, 174, 96, 0.3);
}

.online-message {
    background: #95a5a6;
    color: white;
    padding: 60px;
    border-radius: 10px;
    text-align: center;
    font-size: 18px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(149, 165, 166, 0.3);
    margin: 40px 0;
}

.online-message small {
    font-size: 14px;
    font-weight: normal;
    opacity: 0.9;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .grid-container {
        grid-template-columns: repeat(4, 1fr);
        max-width: 1200px;
    }
}

@media (max-width: 1024px) {
    .grid-container {
        grid-template-columns: repeat(3, 1fr);
        max-width: 900px;
    }
    .logo img {
        max-height: 80px;
    }
    .grid-item {
        padding: 20px;
    }
    .grid-item a {
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        padding: 15px;
    }
    .logo img {
        max-height: 70px;
    }
    .content {
        padding: 15px;
    }
    .page-content {
        padding: 20px;
    }
    .grid-item {
        padding: 18px;
    }
    .grid-item a {
        font-size: 14px;
    }
    .tab-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    .tab-buttons {
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .grid-container {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 10px;
    }
    .logo img {
        max-height: 60px;
    }
    .content {
        padding: 10px;
    }
    .page-content {
        padding: 15px;
    }
    .grid-item {
        padding: 15px;
    }
    .grid-item a {
        font-size: 13px;
    }
    .tab-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    .tab-buttons {
        gap: 6px;
        flex-direction: column;
    }
    .online-message {
        padding: 40px 20px;
        font-size: 16px;
    }
}