/* Trang Đăng nhập */
:root {
    --brand-primary: #0d6efd;
    --brand-dark: #0a58ca;
}
body {
    min-height: 100vh;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.login-wrapper {
    width: 100%;
    max-width: 420px;
}
.login-card {
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .08);
    border: none;
    overflow: hidden;
}
.login-header {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-dark) 100%);
    color: #fff;
    padding: 1.75rem 1.5rem;
    text-align: center;
}
.login-header i {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    opacity: .95;
}
.login-header h1 {
    font-size: 1.35rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.02em;
}
.login-header p {
    font-size: 0.875rem;
    opacity: .9;
    margin: 0.25rem 0 0;
}
.login-body {
    padding: 1.75rem 1.5rem;
}
.form-control, .btn-login {
    border-radius: 0.5rem;
    padding: 0.65rem 1rem;
}
.form-control:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, .2);
}
.input-group-text {
    border-radius: 0.5rem 0 0 0.5rem;
    background: #f8fafc;
    border-right: 0;
}
.input-group .form-control {
    border-left: 0;
    border-radius: 0 0.5rem 0.5rem 0;
}
.input-group .form-control:focus {
    border-left: none;
    box-shadow: none;
}
.input-group:focus-within .input-group-text {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}
.btn-login {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-dark) 100%);
    border: none;
    font-weight: 600;
    padding: 0.75rem;
}
.btn-login:hover {
    opacity: .95;
    transform: translateY(-1px);
}
.form-check-input:checked {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}
.back-home {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 1.25rem;
    color: #64748b;
    font-size: 0.875rem;
    text-decoration: none;
}
.back-home:hover {
    color: var(--brand-primary);
}