:root {
    --primary-color: #0d6efd;
    --bg-dark: #121212;
    --card-bg: #1e1e1e;
    --text-main: #e0e0e0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar {
    background-color: rgba(0, 0, 0, 0.9) !important;
    border-bottom: 1px solid #333;
}

.hero-section {
    padding: 100px 0;
    background: linear-gradient(45deg, #0f2027, #203a43, #2c5364);
    text-align: center;
}

.btn-primary {
    padding: 12px 30px;
    font-weight: bold;
    transition: 0.3s;
}

.os-card {
    background: var(--card-bg);
    border: 1px solid #333;
    border-radius: 15px;
    transition: transform 0.3s;
}

.os-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
}

footer {
    padding: 30px 0;
    border-top: 1px solid #333;
    margin-top: 50px;
}

.bg-gradient {
    padding: 60px 0;
}

.badge {
    min-width: 50px;
}

.alert-info {
    background-color: rgba(13, 110, 253, 0.1);
    border-color: var(--primary-color);
    color: #fff;
}