Here is your updated CSS code. The new header flexbox positioning and the classes for your side-by-side logo image (`.logo-img` and `.logo-text`) have been fully integrated into the layout rules.

```css
/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
}

/* Header Styling - Updated to accommodate image + text logo */
header {
    background: #1a1a1a; /* Matches the clean dark look of the logo background */
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px; /* Adds a clean spacing between the image and your text */
}

.logo-img {
    height: 50px; /* Constrains the logo block size */
    width: auto;
    border-radius: 4px;
    object-fit: contain;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: #ffffff; 
    font-family: Arial, sans-serif;
}

.logo span {
    color: #d9534f; /* Crimson theme accents if used inside text */
}

nav ul {
    list-style: none;
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
}

nav ul li a:hover {
    color: #d9534f;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1503376780353-7e6692767b70?auto=format&fit=crop&w=1200&q=80') no-repeat center center/cover;
    height: 60vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
}

.hero h1 {
    font-size: 45px;
    margin-bottom: 10px;
}

/* Filter Box */
.filter-container {
    max-width: 900px;
    margin: -40px auto 40px auto;
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
    z-index: 10;
}

.filter-box {
    display: flex;
    gap: 15px;
}

.filter-box select, .filter-box button {
    flex: 1;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
}

.filter-box button {
    background: #d9534f;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.filter-box button:hover {
    background: #c9302c;
}

/* Inventory Showroom */
.inventory {
    padding: 20px 10%;
    text-align: center;
}

.inventory h2 {
    margin-bottom: 30px;
    font-size: 32px;
}

.car-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.car-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: left;
    transition: 0.3s;
}

.car-card:hover {
    transform: translateY(-5px);
}

.car-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.car-details {
    padding: 20px;
}

.car-details h3 {
    margin-bottom: 10px;
}

.price {
    color: #d9534f;
    font-weight: bold;
    font-size: 18px;
    margin-top: 10px;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: #777;
    text-align: center;
    padding: 20px;
    margin-top: 50px;
}
.showroom-action{

text-align:center;

margin:50px 0;

}


.show-all-btn{

background:#d32f2f;

color:#fff;

border:none;

padding:16px 45px;

font-size:18px;

border-radius:50px;

cursor:pointer;

font-weight:bold;

transition:.3s;

}


.show-all-btn:hover{

background:#111;

transform:translateY(-5px);

}


.car-grid{

display:grid;

grid-template-columns:repeat(auto-fit,minmax(340px,1fr));

gap:30px;

margin-top:40px;

}


.car-card{

background:#fff;

border-radius:15px;

overflow:hidden;

box-shadow:0 8px 20px rgba(0,0,0,.12);

transition:.3s;

}


.car-card:hover{

transform:translateY(-10px);

}


.car-image{

position:relative;

}


.car-image img{

width:100%;

height:230px;

object-fit:cover;

}


.price-tag{

position:absolute;

right:15px;

bottom:15px;

background:#d32f2f;

color:#fff;

padding:8px 18px;

border-radius:30px;

font-weight:bold;

}


.car-info{

padding:20px;

}


.car-info h3{

margin-bottom:15px;

font-size:22px;

color:#222;

}


.specs{

display:grid;

grid-template-columns:1fr 1fr;

gap:12px;

margin-bottom:20px;

}


.specs span{

font-size:14px;

color:#666;

}


.specs i{

color:#d32f2f;

margin-right:6px;

}


.details-btn{

width:100%;

padding:14px;

background:#222;

color:#fff;

border:none;

border-radius:8px;

font-size:16px;

cursor:pointer;

transition:.3s;

}


.details-btn:hover{

background:#d32f2f;

}
/* ==========================================
   RESPONSIVE DESIGN
========================================== */

/* Tablets */
@media screen and (max-width:992px){

header{
    flex-direction:column;
    padding:15px;
}

.logo{
    margin-bottom:15px;
}

nav ul{
    flex-wrap:wrap;
    justify-content:center;
    gap:10px;
}

.hero{
    height:55vh;
}

.hero h1{
    font-size:38px;
}

.hero p{
    font-size:18px;
}

.filter-box{
    flex-direction:column;
}

.inventory{
    padding:20px;
}

.car-grid{
    grid-template-columns:repeat(2,1fr);
    gap:20px;
}

.services-grid{
    grid-template-columns:repeat(2,1fr);
}

.contact-container{
    grid-template-columns:1fr;
}

.director-section{
    flex-direction:column;
}

.why{
    grid-template-columns:1fr;
}

}
/* ==========================================
   MOBILE PHONES
========================================== */

@media screen and (max-width:768px){

header{

    flex-direction:column;

}

nav ul{

    flex-direction:column;

    width:100%;

    text-align:center;

}

nav ul li{

    margin:8px 0;

}

.logo{

    justify-content:center;

}

.logo-img{

    width:70px;

}

.hero{

    height:45vh;

    padding:20px;

}

.hero h1{

    font-size:30px;

}

.hero p{

    font-size:16px;

}

.filter-container{

    margin-top:20px;

    padding:20px;

}

.filter-box{

    flex-direction:column;

}

.filter-box select,

.filter-box button{

    width:100%;

}

.inventory{

    padding:15px;

}

.inventory h2{

    font-size:28px;

}

.car-grid{

    grid-template-columns:1fr;

}

.car-card img{

    height:220px;

}

.about-container{

    padding:15px;

}

.director-section{

    flex-direction:column;

    text-align:center;

}

.story-section h2,

.services-section h2{

    font-size:28px;

}

.services-grid{

    grid-template-columns:1fr;

}

.service-card{

    padding:20px;

}

.contact-container{

    grid-template-columns:1fr;

}

.contact-form,

.contact-info{

    padding:20px;

}

.map iframe{

    height:300px;

}

.faq{

    width:95%;

}

footer{

    padding:20px;

    text-align:center;

}

}
/* ==========================================
   SMALL DEVICES
========================================== */

@media screen and (max-width:480px){

.hero h1{

    font-size:24px;

}

.hero p{

    font-size:14px;

}

.inventory h2{

    font-size:24px;

}

.car-info h3{

    font-size:20px;

}

.price-tag{

    font-size:14px;

}

.show-all-btn{

    width:100%;

}

.details-btn{

    width:100%;

}

.service-card{

    padding:15px;

}

.contact-form button{

    width:100%;

}

iframe{

    height:250px;

}

}