:root {
  --burger-size: 44px;
  --nav-width: 85vw;
  --transition: 280ms cubic-bezier(0.4, 0, 0.2, 1);
  --accent: #b38936;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}



@media (max-width: 767px) {

  .header {
    position: fixed;
    width: 100%;
    height: 56px;
    right: auto;
    left: 0;
    top: 0;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    gap: 12px;
  }

  .header__image img {
    width: 32px;
    height: auto;
  }

  .header__menu-top {
    display: none;
  }

  
  .burger {
    display: flex !important;
    align-items: center;
    justify-content: center;
    appearance: none;
    border: none;
    background: transparent;
    width: var(--burger-size);
    height: var(--burger-size);
    padding: 8px;
    cursor: pointer;
    border-radius: 8px;
    margin-left: auto;
    -webkit-tap-highlight-color: transparent;
    z-index: 200;
  }

  .burger:active {
    background: rgba(0, 0, 0, 0.05);
  }

  .burger__box {
    display: block;
    width: 24px;
    height: 18px;
    position: relative;
  }

  .burger__inner,
  .burger__inner::before,
  .burger__inner::after {
    display: block;
    background-color: #333;
    height: 2px;
    border-radius: 2px;
    position: absolute;
    left: 0;
    right: 0;
    transition: transform var(--transition), opacity var(--transition), top var(--transition);
  }

  .burger__inner {
    top: 50%;
    transform: translateY(-50%);
  }

  .burger__inner::before {
    content: "";
    top: -7px;
  }

  .burger__inner::after {
    content: "";
    top: 7px;
  }

  .burger[aria-expanded="true"] .burger__inner {
    background: transparent;
  }

  .burger[aria-expanded="true"] .burger__inner::before {
    top: 0;
    transform: rotate(45deg);
    background: var(--accent);
  }

  .burger[aria-expanded="true"] .burger__inner::after {
    top: 0;
    transform: rotate(-45deg);
    background: var(--accent);
  }


  .nav-overlay {
    display: block !important;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    z-index: 90;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
  }

  .nav-overlay.visible {
    opacity: 1;
    visibility: visible;
  }

  .nav {
    position: fixed !important;
    top: 0;
    left: 0;
    height: 100vh;
    height: 100dvh;
    width: var(--nav-width);
    max-width: 300px;
    background: #fff;
    transform: translateX(-105%);
    transition: transform var(--transition);
    box-shadow: var(--shadow);
    z-index: 150;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0;
  }

  .nav.nav--open {
    transform: translateX(0);
  }

  .nav__list {
    display: flex !important;
    flex-direction: column !important;
    gap: 0 !important;
    padding: 70px 0 40px !important;
    margin: 0 !important;
    list-style: none !important;
  }

  .nav__list .header__menu {
    margin: 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  }

  .nav__list .header__menu:last-child {
    border-bottom: none;
  }

  .nav__list .header__menu a {
    display: block !important;
    padding: 18px 24px !important;
    font-size: 16px !important;
    font-weight: 600 !important;
    color: #222 !important;
    text-decoration: none !important;
    background: transparent;
    transition: background 0.15s ease, color 0.15s ease;
  }

  .nav__list .header__menu a:hover,
  .nav__list .header__menu a:active {
    background: rgba(179, 137, 54, 0.1);
    color: var(--accent) !important;
  }

  .nav::before {
    content: "REVO";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 18px 24px;
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--accent);
    background: #fff;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 10;
  }

  .back-to-top {
    position: fixed !important;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    z-index: 1000;

    display: flex !important;
    align-items: center;
    justify-content: center;

    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    pointer-events: none;

    transition: 
      opacity 0.3s ease,
      visibility 0.3s ease,
      transform 0.3s ease;

    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    -webkit-tap-highlight-color: transparent;
  }

  .back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .back-to-top:active {
    transform: scale(0.9);
    background: #9a7530;
  }


  main {
    margin-right: 0 !important;
    padding-top: 70px;
  }

  body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
  }
}

@media (max-width: 360px) {
  .nav {
    width: 90vw;
  }

  .nav__list .header__menu a {
    padding: 16px 20px !important;
    font-size: 15px !important;
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 50px;
    height: 50px;
    font-size: 18px;
  }
}