:root {
    --primary-color: #4f46e5;
    --secondary-color: #10b981;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-main: #334155;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-main);
    margin: 0;
    padding: 0;
}

header {
    background: linear-gradient(135deg, var(--dark-bg), var(--primary-color));
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

nav {
    background-color: white;
    padding: 15px;
    display: flex;
    justify-content: center;
    gap: 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

nav a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--primary-color);
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.card:hover {
    transform: translateY(-5px);
}

.badge {
    display: inline-block;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    color: white;
    background-color: var(--secondary-color);
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 20px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    margin-top: 15px;
    transition: background 0.3s;
    text-align: center;
}

.btn:hover {
    background-color: #3730a3;
}

.loading-text {
    text-align: center;
    font-size: 1.2rem;
    color: #64748b;
    grid-column: 1 / -1;
    padding: 40px 0;
}