body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.login-container {
    margin: 0 30px;
    max-width: 400px; /* Tăng chiều rộng từ 400px lên 500px */
    width: 100%;
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}
.login-header {
    text-align: center;
    margin-bottom: 30px;
}
.login-header h2 {
    color: #3f4d67;
    font-weight: 600;
    margin-bottom: 10px;
}
.login-header p {
    color: #6c757d;
    font-size: 15px;
}
.form-group {
    margin-bottom: 25px;
}
.form-control {
    height: 50px;
    border-radius: 5px;
    box-shadow: none;
    border: 1px solid #ddd;
    padding-left: 15px;
    font-size: 15px;
}
.form-control:focus {
    border-color: #4099ff;
    box-shadow: 0 0 5px rgba(64, 153, 255, 0.3);
}
.input-group-prepend .input-group-text {
    background-color: #f8f9fa;
    border-right: none;
    width: 45px;
    justify-content: center;
}
.input-group-append .input-group-text {
    background-color: transparent;
    border-left: none;
    cursor: pointer;
    width: 45px;
    justify-content: center;
}
.form-control.left-border-none {
    border-left: none;
}
.btn-login {
    background-color: #4099ff;
    border: none;
    height: 50px;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    letter-spacing: 0.5px;
}
.btn-login:hover {
    background-color: #2d7edb;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(64, 153, 255, 0.4);
}
.forgot-link {
    text-align: right;
    display: block;
    margin-top: 10px;
    color: #4099ff;
    font-size: 14px;
    text-decoration: none;
    transition: color 0.2s;
}
.forgot-link:hover {
    color: #2d7edb;
    text-decoration: underline;
}
.register-link {
    color: #4099ff;
    text-decoration: none;
    transition: color 0.2s;
}
.register-link:hover {
    color: #2d7edb;
    text-decoration: underline;
}
.custom-checkbox .custom-control-label::before {
    border-radius: 3px;
}
.custom-control-label {
    cursor: pointer;
    user-select: none;
}