:root {
    --main-color: #0d6efd;
    /* primary */
    --secondary-color: #198754;
    /* success */
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --card-radius: 12px;
}

body {
    background-color: var(--bg-color);
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 500px;
    background-color: var(--card-bg);
    border-radius: var(--card-radius);
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.login-card:hover {
    transform: translateY(-3px);
}

.login-card h3 {
    font-weight: 600;
}

.login-card .btn {
    border-radius: 50px;
    padding: 10px;
    font-weight: 500;
    transition: transform 0.2s ease;
}

.login-card .btn:hover {
    transform: scale(1.03);
}

.register-link {
    display: inline-block;
    color: var(--main-color);
    font-weight: 500;
    text-decoration: none;
    position: relative;
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

.register-link::after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    left: 0;
    bottom: 0;
    background-color: var(--main-color);
    transition: width 0.3s ease;
}

.register-link:hover::after {
    width: 100%;
}

.register-link:hover {
    transform: scale(1.05);
}