* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    font-family: Arial, Helvetica, sans-serif;
    background: #111827;
    color: #1f2937;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    padding: 32px;
    border-radius: 18px;
    background: #ffffff;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.login-header {
    margin-bottom: 28px;
    text-align: center;
}

.login-header h1 {
    margin-bottom: 8px;
    font-size: 28px;
    color: #111827;
}

.login-header p {
    color: #6b7280;
    font-size: 15px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-weight: 700;
    color: #374151;
}

.form-control {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    outline: none;
    font-size: 16px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    border-color: #dc2626;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

.btn-login {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 10px;
    background: #dc2626;
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-login:hover {
    background: #b91c1c;
}

.alert {
    margin-bottom: 20px;
    padding: 12px 14px;
    border-radius: 9px;
    font-size: 14px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.login-footer {
    margin-top: 22px;
    text-align: center;
    color: #9ca3af;
    font-size: 13px;
}

@media (max-width: 480px) {
    .login-card {
        padding: 24px 20px;
    }

    .login-header h1 {
        font-size: 24px;
    }
}