:root {
  --usg-bg: #221818;
  --usg-text: #e7e7e7;
  --usg-muted: #d4d4d4;
  --usg-brand: #b81c22;
  --usg-card-bg: #787474;
  --usg-card-border: rgba(231, 231, 231, 0.6);
  --usg-card-hover: #e7e7e7;
  --usg-input-border: rgba(231, 231, 231, 0.6);
  --usg-inner: 91.666vw;
  --zs-brand: #b81c22;
  --zs-muted: #d6d8d9;
  --zs-inner: 83.333vw;
}

body.zs-usage {
  background: var(--usg-bg);
  color: var(--usg-text);
}

.usage-page {
  width: 100%;
  overflow-x: hidden;
}

.zs-inner {
  width: var(--zs-inner);
  margin: 0 auto;
  padding: 0 2.083vw;
  box-sizing: border-box;
}

.usage-inner {
  width: var(--usg-inner);
  margin: 0 auto;
  padding: 0 4.166vw;
  box-sizing: border-box;
}

.usage-hero {
  position: relative;
  width: 100%;
  min-height: 28.333vw;
  padding-top: 4.062vw;
  overflow: hidden;
  background: #0d0707;
  display: flex;
  align-items: center;
  justify-content: center;
}

.usage-hero-bg {
  position: absolute;
  inset: 0;
}

.usage-hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.usage-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13, 7, 7, 0.35) 0%, rgba(13, 7, 7, 0.55) 60%, rgba(34, 24, 24, 1) 100%);
  pointer-events: none;
}

.usage-hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2.395vw;
  color: #ffffff;
  padding-top: 4.166vw;
  padding-bottom: 4.166vw;
}

.usage-hero-title {
  margin: 0;
  line-height: 1.4;
}

.usage-hero-desc {
  margin: 0;
  width: 36.041vw;
  color: rgba(231, 231, 231, 0.85);
  line-height: 1.7;
}

.usage-board {
  background: var(--usg-bg);
  padding: 5.729vw 0 7.291vw;
}

.usage-board-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 3.125vw;
  align-items: flex-start;
  padding: 0 15.104vw 0 8.333vw;
}

.usage-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.52vw;
  position: sticky;
  top: 5.208vw;
}

.usage-sidebar-btn {
  width: 100%;
  height: 2.291vw;
  padding: 0 0.833vw;
  border: none;
  border-left: 0.156vw solid transparent;
  border-radius: 0.208vw;
  background: transparent;
  color: var(--usg-text);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  font-weight: 300;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.usage-sidebar-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
}

.usage-sidebar-btn.is-active {
  background: #ffffff;
  color: var(--usg-brand);
  border-left-color: var(--usg-brand);
  font-weight: 500;
  box-shadow: 0 0.52vw 0.781vw -0.156vw rgba(0, 0, 0, 0.1), 0 0.208vw 0.312vw -0.208vw rgba(0, 0, 0, 0.1);
}

.usage-content {
  width: 54.062vw;
}

.usage-toolbar {
  display: flex;
  align-items: center;
  gap: 0.833vw;
  margin-bottom: 3.125vw;
  flex-wrap: wrap;
}

.usage-search {
  flex: 1 1 19.791vw;
  min-width: 12.5vw;
  height: 2.187vw;
  display: flex;
  align-items: center;
  gap: 0.52vw;
  padding: 0 0.729vw;
  border: 0.052vw solid var(--usg-input-border);
  border-radius: 0.208vw;
  background: transparent;
  transition: border-color 0.25s ease;
}

.usage-search:focus-within {
  border-color: var(--usg-brand);
}

.usage-search-icon {
  width: 0.937vw;
  height: 0.937vw;
  color: rgba(231, 231, 231, 0.7);
  flex-shrink: 0;
  display: inline-flex;
}

.usage-search-icon svg {
  width: 100%;
  height: 100%;
}

.usage-search input {
  flex: 1;
  height: 100%;
  border: none;
  background: transparent;
  color: #ffffff;
  font-size: 0.833vw;
  font-family: inherit;
  padding: 0;
}

.usage-search input::placeholder {
  color: #52525c;
}

.usage-sort {
  position: relative;
  flex: 0 0 auto;
}

.usage-sort-trigger {
  height: 2.187vw;
  min-width: 9.062vw;
  padding: 0 0.833vw;
  border: 0.052vw solid rgba(39, 39, 42, 0.6);
  border-radius: 0.208vw;
  background: transparent;
  color: #9f9fa9;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.625vw;
  cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease;
}

.usage-sort-trigger:hover {
  border-color: rgba(231, 231, 231, 0.6);
  color: #e7e7e7;
}

.usage-sort-arrow {
  width: 0.677vw;
  height: 0.677vw;
  position: relative;
  flex-shrink: 0;
}

.usage-sort-arrow::before {
  content: "";
  position: absolute;
  inset: 0.052vw 0.104vw;
  border-bottom: 0.078vw solid currentColor;
  border-right: 0.078vw solid currentColor;
  transform: translateY(-0.104vw) rotate(45deg);
  transition: transform 0.25s ease;
}

.usage-sort.is-open .usage-sort-arrow::before {
  transform: translateY(0.104vw) rotate(225deg);
}

.usage-sort-menu {
  position: absolute;
  top: calc(100% + 0.312vw);
  left: 0;
  margin: 0;
  padding: 0.208vw 0;
  list-style: none;
  width: 7.5vw;
  background: #ffffff;
  border: 0.052vw solid #f3f4f6;
  border-radius: 0.312vw;
  box-shadow: 0 0.52vw 0.781vw -0.156vw rgba(0, 0, 0, 0.1), 0 0.208vw 0.312vw -0.208vw rgba(0, 0, 0, 0.1);
  display: none;
  flex-direction: column;
  z-index: 30;
}

.usage-sort.is-open .usage-sort-menu {
  display: flex;
}

.usage-sort-menu li {
  padding: 0 0.833vw;
  height: 1.875vw;
  display: flex;
  align-items: center;
  color: #4a5565;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.usage-sort-menu li:hover {
  background: rgba(255, 239, 239, 0.5);
  color: var(--usg-brand);
}

.usage-sort-menu li.is-active {
  background: rgba(255, 239, 239, 0.5);
  color: var(--usg-brand);
  font-weight: 500;
}

.usage-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 3.125vw 1.666vw;
  align-items: start;
}

.usage-card {
  position: relative;
  min-height: 11.979vw;
  padding: 1.093vw 1.562vw 1.145vw;
  border: 0.052vw solid var(--usg-card-border);
  border-radius: 0.416vw;
  background: var(--usg-card-bg);
  display: flex;
  flex-direction: column;
  gap: 1.25vw;
  color: #ffffff;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
  overflow: hidden;
}

.usage-card:hover,
.usage-card.is-expanded {
  background: var(--usg-card-hover);
  border-color: var(--usg-brand);
  box-shadow: 0 0.625vw 1.25vw rgba(0, 0, 0, 0.18);
}

.usage-card:hover {
  transform: translateY(-0.104vw);
}

.usage-card.is-expanded {
  transform: none;
  align-self: start;
}

.usage-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.625vw;
}

.usage-card-tag {
  font-size: 0.625vw;
  letter-spacing: 0.062vw;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1;
  transition: color 0.25s ease;
}

.usage-card:hover .usage-card-tag,
.usage-card.is-expanded .usage-card-tag {
  color: #71717b;
}

.usage-card-source {
  width: 1.093vw;
  height: 1.041vw;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  transition: color 0.25s ease;
}

.usage-card-source svg,
.usage-card-source img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  transition: filter 0.25s ease;
}

.usage-card:hover .usage-card-source,
.usage-card.is-expanded .usage-card-source {
  color: var(--usg-brand);
}

.usage-card:hover .usage-card-source img,
.usage-card.is-expanded .usage-card-source img {
  filter: brightness(0) saturate(100%) invert(18%) sepia(85%) saturate(3500%) hue-rotate(346deg) brightness(94%) contrast(101%);
}

.usage-card-body {
  display: flex;
  flex-direction: column;
  gap: 0.208vw;
  min-width: 0;
}

.usage-card-title {
  margin: 0;
  font-size: 1.25vw;
  font-weight: 500;
  line-height: 1.2;
  color: #ffffff;
  transition: color 0.25s ease;
}

.usage-card:hover .usage-card-title,
.usage-card.is-expanded .usage-card-title {
  color: var(--usg-brand);
}

.usage-card-desc {
  margin: 0;
  font-size: 0.729vw;
  line-height: 1.55;
  color: var(--usg-muted);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  transition: color 0.25s ease;
}

.usage-card:hover .usage-card-desc,
.usage-card.is-expanded .usage-card-desc {
  color: #595757;
}

.usage-card.is-expanded .usage-card-desc {
  -webkit-line-clamp: unset;
  line-clamp: unset;
  display: block;
  overflow: visible;
}

.usage-card-link {
  margin-top: auto;
  padding-top: 0.625vw;
  border-top: 0.052vw solid #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.625vw;
  color: #ffffff;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.usage-card:hover .usage-card-link,
.usage-card.is-expanded .usage-card-link {
  color: var(--usg-brand);
  border-top-color: var(--usg-brand);
}

.usage-card-arrow {
  width: 1.354vw;
  height: 1.302vw;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.usage-card-arrow img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  transition: filter 0.25s ease;
}

.usage-card:hover .usage-card-arrow img,
.usage-card.is-expanded .usage-card-arrow img {
  filter: brightness(0) saturate(100%) invert(18%) sepia(85%) saturate(3500%) hue-rotate(346deg) brightness(94%) contrast(101%);
}

.usage-card.is-hidden {
  display: none;
}

.zs-usage .hero-nav {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(1.041vw);
  -webkit-backdrop-filter: blur(1.041vw);
}

.page-shell {
  width: 100%;
  height: auto;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}


/* 
*======================================================media===============================================================
*/
@media screen and (max-width:768px) {
  :root {
    --usg-inner: 92%;
    --zs-inner: 92%;
  }

  .usage-page {
    width: 100%;
  }

  .zs-inner {
    width: 100%;
    max-width: 100%;
    padding: 0 16px;
  }

  .usage-inner {
    width: 100%;
    max-width: 100%;
    padding: 0 16px;
  }

  .usage-hero {
    width: 100%;
    min-height: 440px;
    padding-top: 56px;
    display: flex;
  }

  .usage-hero-bg img {
    width: 100%;
    height: 100%;
  }

  .usage-hero-bg::after {
    background: linear-gradient(180deg, rgba(13, 7, 7, 0.35) 0%, rgba(13, 7, 7, 0.55) 60%, rgba(34, 24, 24, 1) 100%);
  }

  .usage-hero-inner {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding-top: 64px;
    padding-bottom: 48px;
  }

  .usage-hero-desc {
    width: 100%;
    max-width: 100%;
  }

  .usage-board {
    padding: 48px 0 64px;
  }

  .usage-board-inner {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 24px;
    align-items: stretch;
    padding: 0 16px;
  }

  .usage-sidebar {
    position: static;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
    top: auto;
    width: 100%;
  }

  .usage-sidebar-btn {
    width: 100%;
    flex: 1 1 auto;
    min-width: calc(50% - 4px);
    height: 40px;
    padding: 0 12px;
    border-left: 3px solid transparent;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
  }

  .usage-sidebar-btn.is-active {
    box-shadow: 0 4px 8px -2px rgba(0, 0, 0, 0.1);
  }

  .usage-content {
    width: 100%;
    max-width: 100%;
  }

  .usage-toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
  }

  .usage-search {
    flex: 1 1 100%;
    min-width: 0;
    height: 44px;
    display: flex;
    gap: 10px;
    padding: 0 14px;
    border: 1px solid var(--usg-input-border);
    border-radius: 4px;
  }

  .usage-search-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    display: inline-flex;
  }

  .usage-search-icon svg {
    width: 100%;
    height: 100%;
  }

  .usage-search input {
    flex: 1;
    height: 100%;
    font-size: 14px;
  }

  .usage-sort {
    flex: 1 1 100%;
  }

  .usage-sort-trigger {
    height: 44px;
    min-width: 0;
    width: 100%;
    padding: 0 16px;
    border: 1px solid rgba(39, 39, 42, 0.6);
    border-radius: 4px;
    display: inline-flex;
    gap: 12px;
    justify-content: space-between;
  }

  .usage-sort-arrow {
    width: 13px;
    height: 13px;
    flex-shrink: 0;
  }

  .usage-sort-arrow::before {
    inset: 1px 2px;
    border-bottom: 1.5px solid currentColor;
    border-right: 1.5px solid currentColor;
    transform: translateY(-2px) rotate(45deg);
  }

  .usage-sort.is-open .usage-sort-arrow::before {
    transform: translateY(2px) rotate(225deg);
  }

  .usage-sort-menu {
    top: calc(100% + 6px);
    padding: 4px 0;
    width: 100%;
    border: 1px solid #f3f4f6;
    border-radius: 6px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    flex-direction: column;
  }

  .usage-sort.is-open .usage-sort-menu {
    display: flex;
  }

  .usage-sort-menu li {
    padding: 0 16px;
    height: 40px;
    display: flex;
    align-items: center;
  }

  .usage-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .usage-card {
    min-height: auto;
    padding: 16px;
    border: 1px solid var(--usg-card-border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .usage-card-head {
    display: flex;
    gap: 12px;
  }

  .usage-card-tag {
    font-size: 12px;
    letter-spacing: 1px;
  }

  .usage-card-title {
    font-size: 18px;
  }

  .usage-card-desc {
    font-size: 14px;
  }

  .usage-card-source {
    width: 21px;
    height: 20px;
    display: inline-flex;
  }

  .usage-card-source svg,
  .usage-card-source img {
    width: 100%;
    height: 100%;
  }

  .usage-card-body {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .usage-card-link {
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    display: flex;
    gap: 12px;
    min-height: 40px;
    align-items: center;
  }

  .usage-card-arrow {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    display: inline-flex;
  }

  .usage-card-arrow img {
    width: 100%;
    height: 100%;
  }

  .zs-usage .hero-nav {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }

  .page-shell {
    width: 100%;
    display: flex;
    flex-direction: column;
  }
}