body {
    background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.7)), 
                url('https://images.unsplash.com/photo-1551882547-ff40c63fe5fa?w=1600') center/cover fixed;
    min-height: 100vh;
}

.login-container, .signup-container {
    max-width: 450px;
    margin: 80px auto;
}

.login-card, .signup-card {
    background: var(--bg-white);
    border-radius: 0;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    border-top: 5px solid var(--secondary);
}

.login-header, .signup-header {
    background: var(--bg-white);
    color: var(--primary);
    padding: 40px 30px 10px;
    text-align: center;
}

.login-header h2, .signup-header h2 {
    margin: 0;
    font-size: 2.2rem;
    font-weight: 700;
}

.login-header p, .signup-header p {
    margin: 10px 0 0 0;
    color: var(--text-muted);
}

.login-body, .signup-body {
    padding: 30px 40px 40px;
}

.form-control {
    border-radius: 0;
    padding: 12px 15px;
    border: 1px solid #cbd5e1;
    background: var(--bg-light);
}

.form-control:focus {
    box-shadow: none;
    border-color: var(--secondary);
    background: var(--bg-white);
}

.input-group-text {
    background: var(--primary);
    color: var(--secondary);
    border-radius: 0;
    border: none;
}

.btn-login, .btn-signup {
    background: var(--primary);
    color: var(--secondary);
    padding: 12px;
    border: 2px solid var(--primary);
    border-radius: 0;
    width: 100%;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s;
}

.btn-login:hover, .btn-signup:hover {
    background: var(--secondary);
    color: var(--primary);
    border-color: var(--secondary);
}

.divider {
    text-align: center;
    margin: 25px 0;
    position: relative;
}

.divider::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 1px;
    background: #e2e8f0;
}

.divider span {
    background: var(--bg-white);
    padding: 0 15px;
    position: relative;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
}

.back-home {
    text-align: center;
    margin-top: 30px;
}

.back-home a {
    color: var(--bg-white);
    text-decoration: none;
    font-weight: 500;
    letter-spacing: 1px;
}

.back-home a:hover {
    color: var(--secondary);
}

.password-requirements {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}