.desktop-top-navigation__dropdown {
  position: relative;
  flex: 0 0 auto;
  height: 54px;
}

.desktop-top-navigation__dropdown summary {
  position: relative;
  color: #2c2925;
  font-family: "Open Sans", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(12px, 0.92vw, 14px);
  letter-spacing: 0.04em;
  line-height: 54px;
  list-style: none;
  cursor: pointer;
}

.desktop-top-navigation__dropdown summary::-webkit-details-marker {
  display: none;
}

.desktop-top-navigation__dropdown summary::after {
  margin-left: 0.45rem;
  content: "⌄";
  font-size: 0.8rem;
}

.desktop-top-navigation__submenu {
  position: fixed;
  z-index: 120;
  top: 174px;
  left: 50%;
  width: min(31rem, calc(100vw - 2rem));
  padding: 0.8rem 1.5rem;
  transform: translateX(-50%);
  border: 1px solid rgba(43, 39, 34, 0.12);
  background: #fff;
  box-shadow: 0 1.2rem 3rem rgba(30, 27, 23, 0.14);
}

.desktop-top-navigation__submenu button {
  display: grid;
  grid-template-columns: 2.3rem 1fr auto;
  align-items: center;
  width: 100%;
  padding: 1rem 0.35rem;
  border: 0;
  border-bottom: 1px solid #e1ded7;
  background: transparent;
  color: #302e2a;
  text-align: left;
  cursor: pointer;
}

.desktop-top-navigation__submenu button:last-child {
  border-bottom: 0;
}

.desktop-top-navigation__submenu button > b:first-child {
  font-size: 1.25rem;
  font-weight: 400;
}

.desktop-top-navigation__submenu button span {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
}

.desktop-top-navigation__submenu button span b {
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 1.05rem;
  font-weight: 400;
}

.desktop-top-navigation__submenu button small {
  color: #97928a;
  font-size: 0.72rem;
}

.desktop-top-navigation__submenu button > i {
  font-size: 1.35rem;
  font-style: normal;
}

.maintenance-guide-open {
  overflow: hidden;
}

.maintenance-guide-overlay {
  position: fixed;
  z-index: 1300;
  inset: 0;
  overflow-y: auto;
  background: #f5f2eb;
  color: #2b2925;
}

.maintenance-guide-header {
  position: sticky;
  z-index: 5;
  top: 0;
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  align-items: center;
  min-height: 5rem;
  padding: 0 4vw;
  border-bottom: 1px solid #d9d5cc;
  background: rgba(247, 244, 237, 0.96);
  backdrop-filter: blur(14px);
}

.maintenance-guide-header button {
  width: 2.7rem;
  height: 2.7rem;
  border: 1px solid #bcb7ad;
  border-radius: 50%;
  background: transparent;
  color: inherit;
  font-size: 1.2rem;
  cursor: pointer;
}

.maintenance-guide-header div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.maintenance-guide-header strong {
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 1.15rem;
  font-weight: 400;
}

.maintenance-guide-header small,
.maintenance-guide-header span {
  color: #8d887f;
  font-size: 0.68rem;
  letter-spacing: 0.13em;
}

.maintenance-guide-hero {
  padding: clamp(5rem, 10vw, 10rem) 8vw;
  background: #e9e4da;
}

.maintenance-guide-hero > p,
.maintenance-material-copy > p:first-child,
.oil-guide-section > p:first-child {
  color: #8c857a;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
}

.maintenance-guide-hero h1 {
  margin: 0.9rem 0 2.5rem;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(3.3rem, 8vw, 8rem);
  font-weight: 400;
}

.maintenance-guide-hero h2 {
  margin: 0 0 1.5rem;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(1.7rem, 3.4vw, 3.5rem);
  font-weight: 400;
  line-height: 1.35;
}

.maintenance-guide-hero > span {
  color: #6f6a61;
}

.maintenance-guide-index {
  position: sticky;
  z-index: 4;
  top: 5rem;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid #d7d2c9;
  background: #f7f4ed;
}

.maintenance-guide-index a {
  flex: 0 0 auto;
  padding: 1rem 1.25rem;
  border-right: 1px solid #dedad1;
  color: inherit;
  font-size: 0.78rem;
  text-decoration: none;
}

.maintenance-guide-index a span {
  margin-right: 0.45rem;
  color: #9b958b;
}

.maintenance-guide-content {
  width: min(100% - 8vw, 92rem);
  margin: 0 auto;
  padding: 5rem 0 8rem;
}

.maintenance-material-entry {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(24rem, 1.1fr);
  gap: 5vw;
  align-items: start;
  padding: 4rem 0;
  border-bottom: 1px solid #d8d4cb;
  scroll-margin-top: 9rem;
}

.maintenance-material-entry:nth-child(even) figure {
  order: -1;
}

.maintenance-material-copy h2,
.oil-guide-section h2 {
  margin: 0.6rem 0 1.2rem;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 400;
}

.maintenance-material-copy > strong,
.oil-guide-section > strong {
  display: block;
  margin-bottom: 1.5rem;
  font-size: 1rem;
  font-weight: 500;
}

.maintenance-material-copy p,
.maintenance-material-copy li,
.oil-guide-section li {
  color: #666158;
  font-size: 0.9rem;
  line-height: 1.85;
}

.maintenance-material-copy h3 {
  margin: 1.8rem 0 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
}

.maintenance-material-copy ul,
.oil-guide-section ol,
.oil-guide-section ul {
  padding-left: 1.2rem;
}

.maintenance-material-entry figure {
  height: min(72vh, 48rem);
  margin: 0;
  background: #e7e3db;
}

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

.wood-oil-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: #fff;
}

.wood-oil-hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.58);
}

.wood-oil-hero div {
  position: relative;
  z-index: 1;
}

.wood-oil-hero h1 {
  margin-bottom: 1rem;
}

.oil-guide-content {
  width: min(100% - 12vw, 68rem);
}

.oil-guide-section {
  padding: 4rem 0;
  border-bottom: 1px solid #d8d4cb;
  scroll-margin-top: 9rem;
}

.oil-guide-section li {
  margin-bottom: 0.85rem;
}

.oil-safety-section {
  padding: 3rem;
  background: #e8dfd0;
}

.oil-advantages {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.oil-advantages span {
  padding: 0.55rem 0.8rem;
  border: 1px solid #bbb4a9;
  border-radius: 999px;
  font-size: 0.76rem;
}

.oil-comparison-table > div {
  display: grid;
  grid-template-columns: 8rem 1fr 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid #d8d4cb;
  color: #625e56;
  font-size: 0.78rem;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .maintenance-guide-header {
    grid-template-columns: 3.5rem 1fr;
    padding: 0 1rem;
  }

  .maintenance-guide-header > span {
    display: none;
  }

  .maintenance-material-entry {
    grid-template-columns: 1fr;
    padding: 2.5rem 0;
  }

  .maintenance-material-entry:nth-child(even) figure {
    order: initial;
  }

  .maintenance-material-entry figure {
    height: 58vh;
  }

  .oil-safety-section {
    padding: 1.5rem;
  }

  .oil-comparison-table {
    overflow-x: auto;
  }

  .oil-comparison-table > div {
    min-width: 42rem;
  }
}