* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f8;
    color: #222;
}

.login-container {
    width: 100%;
    max-width: 430px;
    padding: 20px;
}

.login-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 35px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

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

.login-header h1 {
    margin: 0 0 10px;
    font-size: 28px;
    color: #1f2937;
}

.login-header p {
    margin: 0;
    font-size: 14px;
    color: #555;
}

.alert-error {
    margin-bottom: 20px;
    padding: 12px;
    border-radius: 6px;
    background: #fdecec;
    border: 1px solid #e0a0a0;
    color: #b42318;
    font-size: 14px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 7px;
    font-size: 14px;
    font-weight: 600;
    color: #333;
}

.input-group input {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid #b8bec6;
    border-radius: 6px;
    font-size: 15px;
    color: #222;
    background: #fff;
    outline: none;
}

.input-group input:focus {
    border-color: #2563eb;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.12);
}

.login-card button {
    width: 100%;
    padding: 13px;
    border: none;
    border-radius: 6px;
    background: #2563eb;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

.login-card button:hover {
    background: #1d4ed8;
}

@media (max-width: 480px) {
    .login-card {
        padding: 25px;
    }

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