:root {
       --primary-color: #003366;
       --secondary-color: #c0c0c0;
       --third-color: #ffffff;
   }

   * {
       margin: 0;
       padding: 0;
       text-decoration: none;
       font-family: Arial, Helvetica, sans-serif;
   }

   body {
       background-color: var(--third-color);
   }

   .upper-header {
       display: flex;
       justify-content: space-between;
       padding: 20px;
       align-items: center;
       height: 7vh;
   }

   nav {
       display: flex;
       justify-content: space-around;
       padding: 20px;
   }

   nav a {
       color: var(--third-color);
   }

   #search-bar {
       width: 250px;
       padding: 8px;
   }

   .field {
       width: 300px;
       margin: 4vh auto;
   }

   .input-count {
       width: 300px;
       display: flex;
       align-items: center;
       position: relative;
   }

   .input-count input {
       width: 100%;
       height: 30px;
       border-radius: 5px;
       border: 1px solid gray;
   }

   .input-count i {
       position: absolute;
       right: 0;
       margin-right: 35px;
   }

   header {
       background-color: var(--primary-color);
       color: var(--third-color);
   }

   select {
       color: var(--third-color);
       background-color: transparent;
       border: none;
   }

   option {
       color: black;
   }

   .first-section {
       height: 80vh;
       background: url(imgs/african-american-woman-experiencing-vr-simulation.jpg);
       background-size: cover;
       background-repeat: no-repeat;
       display: flex;
   }

   .first-text {
       font-size: 1.7rem;
       padding: 3rem;
       margin-left: 1.5rem;
       margin-top: 14rem;
   }

   .first-text button {
       padding: 0.3rem;
       background-color: transparent;
       border: 2px solid orange;
       width: 9rem;
   }

   .first-text button:hover {
       border: 2px solid rgb(255, 0, 98);
   }

   #choose {
       font-size: 1.1rem;
   }

   .lower-section {
       width: 85%;
       height: 20vh;
       margin-top: -30px;
       background: var(--third-color);
       z-index: 2;
       position: absolute;
       box-shadow: 3px 3px 4px 2px rgb(220, 220, 220);
       display: flex;
       justify-content: space-around;
       align-items: center;
   }

   .inner {
       display: flex;
   }

   i {
       padding: 14px;
   }

   .top-items {
       display: grid;
       padding-left: 7%;
       grid-template-columns: repeat(auto-fill, minmax(350px, 2fr));
   }

   img {
       max-height: 170px;
   }

   .box {
       width: 47%;
       height: 150px;
   }

   .two-box {
       display: flex;
       justify-content: center;
       align-items: center;
       height: 40vh;
       gap: 2%;
   }

   #box1 {
       display: flex;
       align-items: center;
       padding: 10px;
       color: white;
       background: linear-gradient(rgba(0, 0, 0, 0.616), rgba(87, 88, 88, 0.507)), url(imgs/Casely-iphone-13-cases.jpg);
       background-repeat: no-repeat;
       background-size: cover;
       background-position: center;
       font-size: 1.3rem;
   }

   #box2 {
       text-align: center;
       display: flex;
       justify-content: center;
       align-items: center;
       line-height: 25px;
       color: white;
       padding: 10px;
       background: linear-gradient(rgba(0, 0, 0, 0.616), rgba(87, 88, 88, 0.507)), url(imgs/airpods.jpg);
       background-repeat: no-repeat;
       background-size: cover;
       background-position: center;
       font-size: 1.3rem;
   }

   .main-items {
       max-width: 1400px;
       display: grid;
       padding-top: 10px;
       gap: 15px;
       grid-template-columns: repeat(auto-fill, minmax(300px, 2fr));
   }

   .second-section {
       border: 1px solid var(--secondary-color);
       padding: 25px;
   }

   .boxs {
       background-color: #f0f0f1;
   }

   .add {
       display: flex;
       justify-content: space-around;
       padding: 10px;
   }

   .add button {
       width: 40%;
       border: none;
       background-color: rgba(26, 148, 248, 0.623);
       border-radius: 6px;
   }

   .images {
       display: flex;
       justify-content: center;
   }

   .price,
   .Add,
   .boxs p {
       display: grid;
       justify-content: center;
       text-align: center;
       padding: 10px;
   }

   .names {
       color: var(--primary-color);
   }

   .Ad-container {
       width: 1400px;
       background: rgb(38, 38, 38);
       height: 8rem;
       display: flex;
       justify-content: center;
       align-items: center;
       text-align: center;
       color: white;
       padding: 1rem;
   }

   .items button {
       padding: 0.8rem;
       width: 7rem;
   }

   span {
       color: orange;
   }

   .container01 {
       width: 1400px;
       font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
       height: 7rem;
       display: flex;
       justify-content: center;
       align-items: center;
       text-align: center;
       padding: 1rem;
   }

   .container02-main {
       height: 100vh;
   }

   .cont-sub1 {
       display: flex;
       gap: 30px;
       justify-content: center;
   }

   .cont-card01 {
       padding: 3rem;
       color: rgb(70, 79, 79);
       padding: 2rem;
       height: 27vh;
       filter: brightness(60%);
       cursor: pointer;
   }

   .cont-card01:hover {
       touch-action: double-tap-zoom;
   }

   .cont-card01 h1,
   .cont-sub2 h1 {
       z-index: 100;
       color: rgb(255, 255, 255);
       font-size: 1.9rem;
   }

   .cont-sub2 {
       display: flex;
       gap: 30px;
       justify-content: center;
   }

   .cont-card02 {
       padding: 3.5rem;
       width: 22.5%;
       height: 32vh;
       filter: brightness(60%);
   }

   .container-first {
       max-width: 1099px;
       margin: auto;
   }

   .row {
       display: flex;
       flex-wrap: wrap;
   }

   ul {
       list-style: none;
   }

   #black1 {
       background: url(https://images.unsplash.com/photo-1607083206869-4c7672e72a8a?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1000&q=80);
       background-position: center;
       background-size: cover;
       background-repeat: no-repeat;
       width: 55%;
   }

   #black2 {
       background: url(https://images.unsplash.com/photo-1593508512255-86ab42a8e620?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1000&q=80);
       background-position: center;
       background-size: cover;
       background-repeat: no-repeat;
       width: 30%;
   }

   #black3 {
       background: url(https://images.unsplash.com/photo-1511512578047-dfb367046420?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1000&q=80);
       background-position: center;
       background-size: cover;
       background-repeat: no-repeat;
   }

   #black4 {
       background: url(https://images.unsplash.com/photo-1556656793-08538906a9f8?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1000&q=80);
       background-position: center;
       background-size: cover;
       background-repeat: no-repeat;
       width: 55%;
   }

   .footer {
       background-color: #24262b;
       padding: 30px 0;
   }

   .footer-col {
       width: 30%;
       padding: 0 15px;
   }

   .footer-col h4 {
       font-size: 18px;
       color: #ffffff;
       text-transform: capitalize;
       margin-bottom: 35px;
       font-weight: 500;
       position: relative;
   }

   .footer-col h4::before {
       content: '';
       position: absolute;
       left: 0;
       bottom: -10px;
       background-color: #e91e63;
       height: 2px;
       box-sizing: border-box;
       width: 50px;
   }

   .footer-col ul li:not(:last-child) {
       margin-bottom: 10px;
   }

   .footer-col ul li a {
       font-size: 16px;
       text-transform: capitalize;
       color: #ffffff;
       text-decoration: none;
       font-weight: 300;
       color: #bbbbbb;
       display: block;
       transition: all 0.3s ease;
   }

   .footer-col ul li a:hover {
       color: #ffffff;
       padding-left: 8px;
   }

   .footer-col .social-links a {
       display: inline-block;
       height: 40px;
       width: 40px;
       background-color: rgba(255, 255, 255, 0.2);
       margin: 0 10px 10px 0;
       text-align: center;
       line-height: 40px;
       border-radius: 50%;
       color: #ffffff;
       transition: all 0.5s ease;
   }

   .footer-col .social-links a:hover {
       color: #24262b;
       background-color: #ffffff;
   }

   .footer-last {
       text-align: center;
       color: white;
       padding: 10px;
   }

   /* RESPONSIVE DESIGN */

   /* Tablet styles (768px - 1024px) */
   @media (max-width: 1024px) {
       .upper-header {
           flex-direction: column;
           height: auto;
           gap: 15px;
           padding: 15px;
       }

       .input-count {
           width: 100%;
           max-width: 400px;
       }

       #search-bar {
           width: 100%;
       }

       nav {
           flex-wrap: wrap;
           gap: 10px;
           padding: 15px 10px;
           justify-content: center;
       }

       nav a {
           font-size: 14px;
           padding: 5px;
       }

       .first-text {
           font-size: 1.4rem;
           margin-top: 8rem;
           padding: 2rem;
           margin-left: 1rem;
       }

       .lower-section {
           width: 95%;
           flex-wrap: wrap;
           height: auto;
           padding: 20px;
           gap: 15px;
       }

       .inner {
           flex-direction: column;
           align-items: center;
           text-align: center;
           min-width: 200px;
       }

       .top-items {
           grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
           padding: 20px;
       }

       .two-box {
           flex-direction: column;
           height: auto;
           gap: 20px;
           padding: 20px;
       }

       .box {
           width: 90%;
           height: 200px;
       }

       .main-items {
           grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
           padding: 20px;
           max-width: 100%;
       }

       .container01 {
           width: 100%;
           padding: 20px;
       }

       .container02-main {
           height: auto;
           padding: 20px;
       }

       .cont-sub1,
       .cont-sub2 {
           flex-direction: column;
           align-items: center;
           gap: 20px;
       }

       .cont-card01,
       .cont-card02 {
           width: 80%;
           max-width: 500px;
       }

       #black1,
       #black4 {
           width: 80%;
       }

       #black2 {
           width: 80%;
       }
   }

   /* Mobile styles (max-width: 768px) */
   @media (max-width: 768px) {
       .upper-header h2 {
           font-size: 1.2rem;
       }

       nav {
           overflow-x: auto;
           white-space: nowrap;
           padding: 10px;
       }

       nav a {
           display: inline-block;
           margin-right: 15px;
           font-size: 12px;
       }

       select {
           font-size: 12px;
       }

       .first-section {
           height: 60vh;
       }

       .first-text {
           font-size: 1.2rem;
           margin-top: 4rem;
           padding: 1.5rem;
           margin-left: 0.5rem;
       }

       .first-text button {
           width: 8rem;
           padding: 8px;
       }

       .lower-section {
           width: 98%;
           flex-direction: column;
           height: auto;
           margin-top: -20px;
           padding: 15px;
           gap: 10px;
       }

       .inner {
           width: 100%;
           justify-content: flex-start;
           padding: 10px 0;
       }

       .inner div {
           margin-left: 10px;
       }

       .top-items {
           grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
           padding: 15px;
           gap: 15px;
       }

       img {
           max-height: 120px;
       }

       .two-box {
           padding: 15px;
           gap: 15px;
       }

       .box {
           width: 100%;
           height: 150px;
       }

       #box1,
       #box2 {
           font-size: 1rem;
           padding: 15px;
       }

       .main-items {
           grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
           padding: 15px;
           gap: 10px;
       }

       .second-section {
           padding: 15px;
       }

       .container01 {
           height: auto;
           padding: 20px 15px;
       }

       .container01 h1 {
           font-size: 1.5rem;
       }

       .cont-card01 h1,
       .cont-sub2 h1 {
           font-size: 1.2rem;
       }

       .cont-card01,
       .cont-card02 {
           width: 95%;
           padding: 1.5rem;
           height: auto;
           min-height: 150px;
       }

       .footer-col {
           width: 50%;
           margin-bottom: 30px;
       }
   }

   /* Small mobile styles (max-width: 480px) */
   @media (max-width: 480px) {
       .upper-header {
           padding: 10px;
       }

       .upper-header h2 {
           font-size: 1rem;
       }

       .input-count {
           width: 100%;
       }

       nav {
           flex-direction: column;
           gap: 10px;
           padding: 10px;
       }

       nav a {
           margin: 5px 0;
           font-size: 14px;
       }

       .first-section {
           height: 50vh;
       }

       .first-text {
           font-size: 1rem;
           margin-top: 2rem;
           padding: 1rem;
           margin-left: 0;
       }

       .first-text h1 {
           font-size: 1.5rem;
       }

       .lower-section {
           margin-top: -10px;
       }

       .top-items {
           grid-template-columns: 1fr;
           padding: 10px;
       }

       .main-items {
           grid-template-columns: 1fr;
           padding: 10px;
       }

       .boxs {
           margin-bottom: 15px;
       }

       .add {
           flex-direction: column;
           gap: 10px;
       }

       .add button {
           width: 100%;
           padding: 10px;
       }

       .container01 h1 {
           font-size: 1.2rem;
       }

       .cont-card01 h1,
       .cont-sub2 h1 {
           font-size: 1rem;
       }

       .footer-col {
           width: 100%;
       }

       .container02-main {
           height: auto;
           padding: 10px;
       }

       .cont-sub1,
       .cont-sub2 {
           gap: 15px;
       }
   }

   @media(max-width: 767px) {
       .footer-col {
           width: 50%;
           margin-bottom: 30px;
       }
   }

   @media(max-width: 574px) {
       .footer-col {
           width: 100%;
       }
   }