body {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    width: 100%;
    max-width: 420px;
}

.login-header {
    background: linear-gradient(135deg, #0f3460, #533483);
    padding: 2rem;
    text-align: center;
    color: white;
}

.login-header .logo {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.login-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: 2px;
}

.login-header p {
    font-size: 0.85rem;
    opacity: 0.8;
    margin: 0.3rem 0 0;
}

.login-body {
    padding: 2rem;
    background: white;
}

.form-control {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    border: 1.5px solid #dee2e6;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    border-color: #0f3460;
    box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.15);
}

.input-group-text {
    border-radius: 8px 0 0 8px;
    background-color: #f8f9fa;
    border: 1.5px solid #dee2e6;
    border-right: none;
    color: #6c757d;
}

.input-group .form-control {
    border-radius: 0 8px 8px 0;
}

.btn-login {
    background: linear-gradient(135deg, #0f3460, #533483);
    border: none;
    border-radius: 8px;
    padding: 0.75rem;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.5px;
    transition: opacity 0.2s, transform 0.1s;
}

.btn-login:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-login:active {
    transform: translateY(0);
}

.form-label {
    font-weight: 500;
    color: #495057;
    margin-bottom: 0.4rem;
}

.alert {
    border-radius: 8px;
    font-size: 0.9rem;
}