:root {

    /**colors*/

    --light-steel-blue: hsl(59, 88%, 76%);
    --royal-blue-light: hsl(59, 83%, 56%);
    --flickr-blue_30: hsl(218, 45%, 13%);
    --carolina-blue: hsl(59, 88%, 76%);
    --oxford-blue-1: hsl(218, 45%, 13%);
    --oxford-blue-2: hsl(218, 45%, 13%);
    --oxford-blue-3: hsl(218, 45%, 13%);
    --gainsboro_50: hsla(0, 0%, 85%, 0.5);
    --lavender-web: hsl(225, 67%, 91%);
    --sonic-silver: hsl(0, 0%, 47%);
    --light-gray: hsl(0, 0%, 84%);
    --cultured: hsl(0, 0%, 97%);
    --black_10: hsla(0, 0%, 0%, 0.1);
    --black_8: hsla(0, 0%, 0%, 0.08);
    --white: hsl(0, 0%, 100%);
    --black: hsl(0, 0%, 0%);
    --jet: hsl(0, 0%, 20%);

    /*gradient color*/

    --gradient: linear-gradient( 90deg, var(--carolina-blue) 0%, var(--royal-blue-light) 100%);

    /*typography*/

    --ff-roboto: "Roboto", sans-serif;
    --ff-poppins: "Poppins", sans-serif;

    --fs-1: 4rem;
    --fs-2: 3.6rem;
    --fs-3: 3.2rem;
    --fs-4: 2.4rem;
    --fs-5: 2.2rem;
    --fs-6: 1.8rem;
    --fs-7: 1.6rem;

    --fw-800: 800;
    --fw-700: 700;
    --fw-600: 600;
    --fw-500: 500;

    /*spacing*/

    --section-padding: 120px;

    /*shadow*/

    --shadow-1: 4px 4px 15px var(--black_10);
    --shadow-2: 0 10px 15px var(--black_10);
    --shadow-3: 0px 20px 60px var(--black_8);
    --shadow-4: 0px 10px 30px var(--flickr-blue_30);
    --shadow-5: 0px 2px 60px 0px var(--black_10);

    /*border radius*/

    --radius-6: 6px;
    --radius-4: 4px;

    /*transition*/

    --transition: 0.25s ease;
    --cubic-out: cubic-bezier(0.33, 0.85, 0.4, 0.96);

  }





  /*RESET*/
  *,
  *::before,
  *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  li { list-style: none; }

  a {
    text-decoration: none;
    color: inherit;
  }

  a,
  img,
  span,
  input,
  button,
  ion-icon { display: block; }

  img { height: auto; }

  input,
  button {
    background: none;
    border: none;
    font: inherit;
  }

  input { width: 100%; }

  button { cursor: pointer; }

  ion-icon { pointer-events: none; }

  address { font-style: normal; }

  html {
    font-family: var(--ff-roboto);
    font-size: 10px;
    scroll-behavior: smooth;
  }

  body {
    background-color: var(--white);
    color: var(--sonic-silver);
    font-size: 1.5rem;
  }





  /*REUSED STYLE*/

  .container { padding-inline: 25px; }

  .section { padding-block: var(--section-padding); }

  .section-subtitle {
    color: var(--royal-blue-light);
    font-family: var(--ff-poppins);
    font-size: var(--fs-6);
    font-weight: var(--fw-700);
    text-transform: uppercase;
    margin-block-end: 10px;
  }

  .h1,
  .h2,
  .h3 {
    font-family: var(--ff-poppins);
    line-height: 1.2;
  }

  .h1 {
    color: var(--oxford-blue-1);
    font-size: var(--fs-2);
  }

  .h2,
  .h3 { color: var(--oxford-blue-2); }

  .h2 { font-size: var(--fs-1); }

  .h3 { font-size: var(--fs-5); }

  .btn {
    background-image: linear-gradient( var(--deg, 90deg), var(--carolina-blue) 0%, var(--royal-blue-light) 100%);
    color: var(--white);
    font-size: var(--fs-7);
    text-transform: uppercase;
    padding: 20px 30px;
    text-align: center;
    border-radius: var(--radius-4);
    box-shadow: var(--shadow-4);
  }

  .btn:is(:hover, :focus) { --deg: -90deg; }

  .w-100 { width: 100%; }

  .text-center { text-align: center; }

  .card-text,
  .section-text { line-height: 1.7; }

  .img-holder {
    aspect-ratio: var(--width) / var(--height);
    background-color: var(--light-gray);
  }

  .img-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }





  /*HEDER*/

  .header-top,
  .header-bottom .btn { display: none; }

  .header-bottom {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding-block: 15px;
    z-index: 4;
  }

  .header-bottom.active {
    position: fixed;
    top: -81px;
    background-color: var(--white);
    box-shadow: var(--shadow-2);
    animation: slideIn 0.5s var(--cubic-out) forwards;
  }

  @keyframes slideIn {
    0% { transform: translateY(0); }
    100% { transform: translateY(100%); }
  }

  .header-bottom > .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
  }

  .logo {
    color: var(--oxford-blue-1);
    font-family: var(--ff-poppins);
    font-size: 3.4rem;
    font-weight: var(--fw-800);
  }

  .nav-toggle-btn {
    color: var(--black);
    font-size: 30px;
    border: 1px solid var(--black);
    padding: 5px;
  }

  .nav-toggle-btn.active .menu-icon,
  .nav-toggle-btn .close-icon { display: none; }

  .nav-toggle-btn .menu-icon,
  .nav-toggle-btn.active .close-icon { display: block; }

  .navbar {
    position: absolute;
    top: calc(100% + 5px);
    left: 25px;
    right: 25px;
    background-color: var(--white);
    padding-inline: 0;
    box-shadow: var(--shadow-1);
    max-height: 0;
    visibility: hidden;
    overflow: hidden;
    transition: 0.25s var(--cubic-out);
  }

  .navbar.active {
    visibility: visible;
    max-height: 244px;
    transition-duration: 0.5s;
  }

  .navbar-list > li:not(:last-child) { border-block-end: 1px solid var(--gainsboro_50); }

  .navbar-link {
    color: var(--jet);
    text-transform: uppercase;
    font-weight: var(--fw-600);
    padding: 15px;
  }





  /*HERO*/

  .hero {
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    padding-block-end: calc(var(--section-padding) / 2);
  }

  .hero-content { margin-block-end: 50px; }

  .hero-title { margin-block: 15px 30px; }

  .hero-text {
    font-size: var(--fs-6);
    line-height: 1.45;
    margin-block-end: 40px;
  }

  .hero-form {
    background-color: var(--white);
    max-width: 95%;
    padding: 15px;
    border-radius: var(--radius-4);
    box-shadow: var(--shadow-3);
  }

  .hero-form .email-field {
    background-color: var(--cultured);
    color: var(--black);
    min-height: 70px;
    padding-inline: 15px;
    border-radius: var(--radius-4);
    margin-block-end: 15px;
  }

  .hero-form .btn { width: 100%; }





  /*FINDDONOR*/

  .donor-form {
    max-width: 600px;
    margin: 0 auto;
  }

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

  label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
  }

  input[type="text"],
  input[type="tel"],
  input[type="email"],
  select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }

  button.btn {
    display: block;
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  button.btn:hover {
    background-color: #0056b3;
  }





  /*ABOUT*/

  .about { padding-block-end: 0; }

  .about-banner { margin-block-end: 50px; }

  .about .section-text-1 { margin-block: 25px 15px; }

  .about .btn {
    font-size: unset;
    max-width: max-content;
    margin-block-start: 30px;
    padding-inline: 15px;
  }





  /*DOCTOR*/

  .doctor .section-title { margin-block-end: 50px; }

  .doctor-card .card-banner {
    border-radius: var(--radius-4);
    overflow: hidden;
    margin-block-end: 25px;
    overflow: hidden;
  }

  .doctor-card {
      width: 350px;
    padding: 30px;
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-4);
    text-align: center;
    min-height: 100%;
    overflow: hidden;
  }
  .img-holder
  {
      max-width: 300px;
      height: 200px;
  }
  .doctor-card .card-title {
    font-size: var(--fs-4);
    transition: var(--transition);
  }

  .doctor-card:is(:hover, :focus-within) .card-title { color: var(--royal-blue-light); }

  .doctor-card .card-subtitle {
    color: var(--royal-blue-light);
    margin-block: 10px 15px;
  }

  .doctor-card .card-social-list {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
  }

  .doctor-card .card-social-link {
    background-color: var(--lavender-web);
    color: var(--royal-blue-light);
    font-size: 16px;
    padding: 12px;
    border-radius: 50%;
    transition: var(--transition);
  }

  .doctor-card .card-social-link:is(:hover, :focus) {
    background-color: var(--royal-blue-light);
    color: var(--white);
  }

  .has-scrollbar {
      width: 100%;
    display: flex;
    gap: 30px;
    overflow-x: auto;
    margin-inline: 15px;
    padding-block-end: 40px;
    margin-block-end: -20px;
    scroll-snap-type: inline mandatory;
  }

  .scrollbar-item {
    min-width: 400px !important;
    scroll-snap-align: start;
  }

  .has-scrollbar::-webkit-scrollbar { height: 10px; }

  .has-scrollbar::-webkit-scrollbar-track {
    background-color: var(--light-gray);
    border-radius: var(--radius-4);
  }

  .has-scrollbar::-webkit-scrollbar-thumb {
    background-color: var(--royal-blue-light);
    border-radius: var(--radius-4);
  }

  .has-scrollbar::-webkit-scrollbar-button { width: calc(25% - 30px); }





  /*CTA*/

  .cta { background-color: var(--oxford-blue-1); }

  .cta-banner { margin-block-end: 50px; }

  .cta .section-subtitle { text-transform: capitalize; }

  .cta .section-title {
    color: var(--white);
    font-size: var(--fs-3);
    margin-block-end: 30px;
  }

  .cta .btn { max-width: max-content; }





  /*BLOG*/

  .blog .section-title { margin-block-end: 50px; }

  .blog-list {
    display: grid;
    gap: 30px;
  }

  .blog-card {
      display: center;
    border-radius: var(--radius-4);
    box-shadow: var(--shadow-5);
  }

  .blog-card .card-banner {
    position: relative;
    border-radius: var(--radius-4);
    overflow: hidden;
  }

  .blog-card .card-banner img {
    width: 100% !important;
     transition: var(--transition);
    }

  .blog-card:is(:hover, :focus-within) .card-banner img { transform: scale(1.1); }

  .blog-card .card-badge {
    background-color: var(--royal-blue-light);
    color: var(--white);
    position: absolute;
    bottom: 25px;
    left: 25px;
    display: flex;
    gap: 5px;
    padding: 10px 15px;
    border-radius: var(--radius-6);
  }

  .blog-card .card-content { padding: 30px; }

  .blog-card .card-title { transition: var(--transition); }

  .blog-card .card-title:is(:hover, :focus) { color: var(--royal-blue-light); }

  .blog-card .card-text { margin-block: 15px; }

  .blog-card .card-link {
    position: relative;
    color: var(--royal-blue-light);
    font-weight: var(--fw-500);
    text-transform: uppercase;
    width: max-content;
    transition: var(--transition);
  }

  .blog-card .card-link::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--royal-blue-light);
    transition: var(--transition);
  }

  .blog-card .card-link:is(:hover, :focus) { color: var(--oxford-blue-1); }

  .blog-card .card-link:is(:hover, :focus)::after { background-color: var(--oxford-blue-1); }





  /*FOOTER*/

  .footer-top {
    background-color: var(--oxford-blue-2);
    color: var(--light-steel-blue);
  }

  .footer-top .container {
    display: grid;
    gap: 30px;
  }

  .footer-brand .logo { color: var(--white); }

  .footer-text {
    line-height: 1.6;
    margin-block: 15px;
  }

  .schedule {
    display: flex;
    align-items: center;
    gap: 15px;
  }

  .schedule-icon,
  .footer-item .item-icon {
    background-image: var(--gradient);
    color: var(--white);
    font-size: 18px;
    padding: 11px;
    border-radius: 50%;
  }

  .schedule .span,
  .footer-item .item-text { line-height: 1.6; }

  .footer-list-title {
    color: var(--white);
    font-family: var(--ff-poppins);
    font-size: var(--fs-4);
    font-weight: var(--fw-700);
    margin-block-end: 10px;
  }

  .footer-link {
    display: flex;
    align-items: center;
    gap: 5px;
    padding-block: 10px;
    transition: var(--transition);
  }

  .footer-link ion-icon {
    color: var(--royal-blue-light);
    --ionicon-stroke-width: 50px;
  }

  .footer-link:is(:hover, :focus) { color: var(--white); }

  .footer-item {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .footer-item:not(:first-child) { margin-block-start: 20px; }

  .footer-bottom {
    background-color: var(--oxford-blue-3);
    padding-block: 50px;
    text-align: center;
  }

  .copyright {
    color: var(--white);
    line-height: 1.6;
    margin-block-end: 25px;
  }

  .footer .social-list {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
  }

  .footer .social-link {
    padding: 11px;
    background-color: hsla(0, 0%, 100%, 0.2);
    color: var(--white);
    font-size: 18px;
    border-radius: 50%;
  }

  .footer .social-link:is(:hover, :focus) { background-image: var(--gradient); }





  /*BACK TO TOP*/

  .back-top-btn {
    position: fixed;
    bottom: 10px;
    right: 20px;
    background-color: var(--royal-blue-light);
    font-size: 18px;
    color: var(--white);
    padding: 14px;
    border-radius: 50%;
    visibility: hidden;
    opacity: 0;
    transition: var(--transition);
  }

  .back-top-btn.active {
    transform: translateY(-10px);
    visibility: visible;
    opacity: 1;
  }





  /*MEDIA QUERIES-*/
  /*responsive for larger than 575px screen*/
  @media (min-width: 575px) {
    /*CUSTOM PROPERTY*/
    :root {
      /*typography*/
      --fs-1: 4.2rem;
    }

    /*REUSED STYLE*/
    .container {
      max-width: 540px;
      width: 100%;
      margin-inline: auto;
    }

    /*BLOG*/
    .blog-card .h3 { --fs-5: 2.6rem; }

    /*FOOTER*/
    .footer-top .container { grid-template-columns: 1fr 1fr; }
  }

  /* responsive for larger than 768px screen*/

  @media (min-width: 768px) {
    /*CUSTOM PROPERTY*/
    :root {
      /*typography*/
      --fs-2: 4.8rem;
    }



    /*RESET*/
    body { font-size: 1.6rem; }

    /*REUSED STYLE*/
    .container { max-width: 750px; }
    .section-subtitle { --fs-6: 2.2rem; }

    /*HERO*/

    .hero { overflow: hidden; }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 0.75fr;
      align-items: center;
      gap: 20px;
    }

    .hero-content { margin-block-end: 0; }
    .hero-form { position: relative; }
    .hero-form .email-field {
      margin-block-end: 0;
      padding-inline-end: 190px;
    }

    .hero-form .btn {
      width: auto;
      position: absolute;
      top: 15px;
      right: 15px;
      bottom: 15px;
    }

    .hero-banner { margin-inline-end: -60px; }

    /*SERVICE*/
    .service-list {
      grid-template-columns: 1fr 1fr;
      column-gap: 30px;
    }

    /*DOCTOR*/
    .scrollbar-item { min-width: calc(50% - 15px); }

    /*CTA*/
    .cta { padding-block: 0; }
    .cta .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: flex-end;
      gap: 60px;
    }

    .cta-banner { margin-block-end: 0; }
    .cta-content { padding-block: 60px; }

    /* BLOG*/
    .blog-list { grid-template-columns: 1fr 1fr; }

    /*FOOTER*/
    .footer-bottom { padding-block: 30px; }
    .footer-bottom .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .copyright { margin-block-end: 0; }

    /*BACK TO TOP*/

    .back-top-btn {
      bottom: 70px;
      right: 50px;
    }

  }

  /*responsive for larger than 992px screen*/

  @media (min-width: 992px) {

    /*CUSTOM PROPERTY*/

    :root {
      /*typography*/
      --fs-2: 6rem;
      --fs-1: 4.6rem;
      --fs-3: 4.6rem;
    }

    /*REUSED STYLE*/
    .container { max-width: 980px; }

    /*HEADER*/
    .header-top {
      display: block;
      background-color: var(--oxford-blue-1);
      color: var(--white);
      padding-block: 20px;
    }

    .header-top :is(.container, .social-list),
    .contact-list,
    .contact-item {
      display: flex;
      align-items: center;
    }

    .header-top .container { justify-content: space-between; }
    .contact-list { gap: 20px; }
    .contact-item { gap: 5px; }
    .contact-item ion-icon {
      color: var(--royal-blue-light);
      --ionicon-stroke-width: 40px;
    }

    .contact-link { font-size: 1.5rem; }
    .header-top .social-list { gap: 15px; }
    .header-top .social-link {
      font-size: var(--fs-6);
      transition: var(--transition);
    }

    .header-top .social-link:is(:hover, :focus) { color: var(--royal-blue-light); }
    .header-bottom {
      top: 58px;
      padding-block: 20px;
    }

    .header-bottom.active { top: -95px; }
    .nav-toggle-btn { display: none; }

    .navbar,
    .navbar.active {
      all: unset;
      margin-inline-start: auto;
    }

    .navbar-list {
      display: flex;
      align-items: center;
    }

    .navbar-list > li:not(:last-child) { border-block-end: none; }

    .navbar-link {
      color: var(--oxford-blue-1);
      font-family: var(--ff-poppins);
      text-transform: capitalize;
      transition: var(--transition);
    }

    .navbar-link:is(:hover, :focus) { color: var(--royal-blue-light); }

    .header-bottom .btn {
      display: block;
      padding: 15px 20px;
    }

    /*SERVICE*/

    .service-list { grid-template-columns: repeat(3, 1fr); }

    .service-banner {
      display: block;
      grid-column: 2 / 3;
      grid-row: 1 / 4;
      align-self: center;
    }

    /*ABOUT*/
    .about .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 30px;
    }

    .about-banner { margin-block-end: 0; }

    /*DOCTOR*/
    .scrollbar-item { min-width: calc(33.33% - 20px); }

    /*CTA*/
    .cta-content { padding-block: 80px; }



    /*BLOG*/
    .blog-list { grid-template-columns: repeat(3, 1fr); }



    /*FOOTER*/
    .footer-top .container { grid-template-columns: 1fr 0.5fr 0.6fr 0.75fr; }

  }





  /*responsive for larger than 1200px screen*/
  @media (min-width: 1200px) {

    /*CUSTOM PROPERTY*/
    :root {
      /*typography*/
      --fs-2: 8rem;
      --fs-1: 5.5rem;
      --fs-3: 4.8rem;
    }

    /*REUSED STYLE*/
    .container { max-width: 1180px; }

    /*HEADER*/
    .contact-list { gap: 30px; }
    .header-bottom .btn { padding: 18px 30px; }
    .header-bottom > .container { gap: 40px; }
    .navbar-list { gap: 15px; }

    /*ABOUT*/
    .about .container {
      grid-template-columns: 0.85fr 1fr;
      gap: 100px;
    }

    /*DOCTOR*/
    .doctor { padding-block-end: 180px; }
    .scrollbar-item { min-width: calc(25% - 22.5px); }
    .has-scrollbar {
      padding-block-end: 0;
      margin-block-end: 0;
    }

    /*CTA*/
    .cta .container { align-items: center; }
    .cta-banner { margin-block-start: -120px; }

  }