/* 2026 Header and primary navigation */
header {
  position: relative;
  min-height: 82px;
  padding: 0.85rem 2.25rem;
  gap: 0;
  border-top: 3px solid var(--primary-green);
  border-bottom: 1px solid #dce5df;
  background: #fff;
}

.logo-container {
  width: 112px;
  height: 52px;
}

.logo-container a {
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
}

.logo-container img {
  object-fit: contain;
}

.site-title {
  display: flex;
  margin-left: 1rem;
  flex-direction: column;
  color: #203129;
  font-size: 1.42rem;
  font-weight: 750;
  line-height: 1.2;
}

.site-title::after {
  margin-top: 0.3rem;
  content: "工業材料・環保綠能方案";
  color: #6a796f;
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.3;
}

#nav1 {
  position: sticky;
  z-index: 900;
  top: 0;
  min-height: 58px;
  overflow: visible;
  border-bottom: 1px solid rgba(198, 213, 204, 0.9);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 5px 16px rgba(19, 50, 34, 0.05);
  backdrop-filter: blur(10px);
}

#nav1 ul {
  min-height: 58px;
  align-items: stretch;
}

#nav1 li {
  display: flex;
  align-items: stretch;
}

#nav1 li a {
  position: relative;
  display: flex;
  padding: 0.95rem 1.18rem;
  align-items: center;
  border-bottom: 0;
  color: #2d3c34;
  font-size: 0.96rem;
  font-weight: 650;
  text-decoration: none;
}

#nav1 li a::after {
  position: absolute;
  right: 1.15rem;
  bottom: 0;
  left: 1.15rem;
  height: 3px;
  content: "";
  border-radius: 3px 3px 0 0;
  background: var(--primary-green);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-fast);
}

#nav1 li a:hover,
#nav1 li a:focus-visible {
  border-bottom-color: transparent;
  background: #f2f7f4;
  color: var(--primary-green-dark);
}

#nav1 li a:hover::after,
#nav1 li a:focus-visible::after,
#nav1 li a.is-active::after,
#nav1 li a[aria-current="page"]::after {
  transform: scaleX(1);
}

#nav1 li a.is-active,
#nav1 li a[aria-current="page"] {
  color: var(--primary-green-dark);
  background: #f5f9f6;
}

.menu-toggle {
  width: 48px;
  height: 48px;
  padding: 0;
  overflow: hidden;
  border: 1px solid #cddbd2;
  border-radius: 6px;
  background: #fff;
  color: transparent;
  box-shadow: 0 2px 8px rgba(19, 50, 34, 0.08);
  font-size: 0;
  line-height: 0;
}

.menu-toggle::before,
.menu-toggle::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 22px;
  height: 2px;
  content: "";
  border-radius: 2px;
  background: var(--primary-green-dark);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.menu-toggle::before {
  transform: translate(-50%, -7px);
  box-shadow: 0 7px 0 var(--primary-green-dark), 0 14px 0 var(--primary-green-dark);
}

.menu-toggle::after {
  transform: translate(-50%, -50%) rotate(-45deg) scaleX(0);
}

.menu-toggle.open::before {
  box-shadow: none;
  transform: translate(-50%, -50%) rotate(45deg);
}

.menu-toggle.open::after {
  transform: translate(-50%, -50%) rotate(-45deg) scaleX(1);
}

.menu-toggle:hover {
  border-color: #a9c4b4;
  background: #f2f7f4;
}

.menu-toggle:focus-visible {
  outline: 3px solid rgba(23, 107, 69, 0.25);
  outline-offset: 2px;
}

@media (max-width: 767px) {
  header {
    position: sticky;
    z-index: 1000;
    top: 0;
    min-height: 70px;
    padding: 0.55rem 4.5rem 0.55rem 1rem;
    border-top-width: 3px;
    box-shadow: 0 5px 18px rgba(19, 50, 34, 0.08);
  }

  .logo-container {
    width: 90px;
    height: 44px;
  }

  .site-title {
    margin-left: 0.7rem;
    font-size: 1.08rem;
  }

  .site-title::after {
    margin-top: 0.18rem;
    font-size: 0.64rem;
  }

  .menu-toggle {
    position: absolute;
    top: 9px;
    right: 12px;
    display: block;
  }

  #nav1 {
    position: fixed;
    z-index: 999;
    inset: 70px 0 0;
    width: 100%;
    min-height: calc(100dvh - 70px);
    padding: 1.1rem 1rem 2rem;
    justify-content: flex-start;
    overflow-x: hidden;
    overflow-y: auto;
    border: 0;
    background: rgba(247, 250, 248, 0.98);
    box-shadow: none;
    backdrop-filter: blur(12px);
    transform: translateY(-16px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.28s ease, opacity 0.22s ease, visibility 0.28s;
  }

  #nav1.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  #nav1 ul {
    width: 100%;
    max-width: 440px;
    min-height: 0;
    margin: 0 auto;
    align-items: stretch;
  }

  #nav1 li {
    width: 100%;
    opacity: 1;
    border-bottom: 1px solid #d9e5dd;
    transform: none;
    animation: none;
  }

  #nav1 li a {
    width: 100%;
    min-height: 58px;
    margin: 0;
    padding: 1rem 1.05rem;
    justify-content: space-between;
    border-radius: 0;
    color: #26372e;
    font-size: 1.03rem;
    text-align: left;
    transform: none;
  }

  #nav1 li a::before {
    order: 2;
    content: "›";
    color: #819087;
    font-size: 1.35rem;
    font-weight: 400;
  }

  #nav1 li a::after {
    inset: 10px auto 10px 0;
    width: 4px;
    height: auto;
    border-radius: 0 4px 4px 0;
    transform: scaleY(0);
  }

  #nav1 li a:hover,
  #nav1 li a:active,
  #nav1 li a:focus,
  #nav1 li a.touched {
    background: #eaf3ed;
    color: var(--primary-green-dark);
    transform: none;
  }

  #nav1 li a:hover::after,
  #nav1 li a:focus-visible::after,
  #nav1 li a.is-active::after,
  #nav1 li a[aria-current="page"]::after {
    transform: scaleY(1);
  }

  #nav1 li a.is-active,
  #nav1 li a[aria-current="page"] {
    padding-left: 1.25rem;
    background: #eaf3ed;
    font-weight: 750;
  }
}

@media (max-width: 380px) {
  .site-title::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  #nav1,
  #nav1 li a::after,
  .menu-toggle::before,
  .menu-toggle::after {
    transition: none;
  }
}