/* =============================================
   元件樣式 — 按鈕、導覽、標籤、Placeholder
   ============================================= */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.8125rem 1.625rem;
  min-height: 48px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
  white-space: normal;
  overflow-wrap: anywhere;
  max-width: 100%;
  text-align: center;
  cursor: pointer;
}

@media (min-width: 769px) {
  .btn {
    white-space: nowrap;
  }
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
}

.btn-ghost {
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--color-white);
}

.btn-white {
  background: var(--color-white);
  color: var(--color-primary-dark);
  border-color: var(--color-white);
}

.btn-white:hover {
  background: rgba(255, 255, 255, 0.92);
}

.btn-outline-white {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-outline-white:hover {
  border-color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.06);
}

/* ---------- Navigation ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-primary-dark);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.5rem 0.875rem;
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary);
}

.nav-link--lang {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary-mid);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding-inline: 0.625rem;
  letter-spacing: 0.06em;
}

.nav-link--lang.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.nav-item-mobile-only,
.nav-text-mobile,
.nav-backdrop {
  display: none;
}

/* Desktop: logo left, navigation right — no full-width overlay */
@media (min-width: 769px) {
  .site-header-wrap {
    position: sticky;
    display: flex;
    align-items: center;
    height: var(--header-height);
  }

  .site-header {
    flex: 1 1 auto;
    min-width: 0;
  }

  .site-header-wrap > .site-nav {
    position: absolute;
    top: 0;
    right: max(
      var(--container-pad),
      calc((100% - min(100%, var(--container-max))) / 2 + var(--container-pad))
    );
    left: auto;
    bottom: auto;
    width: auto;
    height: var(--header-height);
    display: flex;
    align-items: center;
    pointer-events: auto;
    z-index: 2;
  }

  .site-header-wrap > .site-nav .nav-list {
    pointer-events: auto;
    width: auto;
    max-width: none;
    height: auto;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
  }
}

.nav-chevron {
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

/* Dropdown */
.nav-item-has-dropdown {
  position: relative;
}

.nav-dropdown-toggle[aria-expanded="true"] .nav-chevron {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-md);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 200;
}

.nav-item-has-dropdown.is-open .nav-dropdown,
.nav-item-has-dropdown:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.nav-dropdown-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-xs) var(--space-sm);
  margin-bottom: var(--space-xs);
}

.nav-dropdown-sublabel {
  display: block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-xs) var(--space-sm);
  margin-top: var(--space-xs);
}

.nav-dropdown-link {
  display: block;
  padding: 0.4375rem var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
  min-height: 36px;
  line-height: 1.5;
}

.nav-dropdown-link:hover {
  color: var(--color-primary);
}

.nav-dropdown-link--main {
  font-weight: 600;
  padding: var(--space-sm);
}

.nav-dropdown-divider {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--space-sm) 0;
}

.nav-dropdown-nested ul {
  padding-left: var(--space-md);
  border-left: 1px solid var(--color-border-light);
  margin-left: var(--space-sm);
}

/* ---------- Products Nav Dropdown ---------- */
.nav-item--products {
  position: relative;
}

.nav-link--products {
  gap: 6px;
}

.nav-link--products-chevron {
  display: none;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.product-nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  width: max(220px, 100%);
  min-width: 220px;
  max-width: 280px;
  margin: 0;
  padding: 0.375rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, -4px);
  transition:
    opacity 160ms ease,
    transform 160ms ease,
    visibility 160ms ease;
  z-index: 220;
}

/* Hover bridge — avoid flicker between trigger and panel */
.product-nav-dropdown::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: -12px;
  height: 12px;
}

.nav-item--products:hover .product-nav-dropdown,
.nav-item--products:focus-within .product-nav-dropdown,
.nav-item--products.is-open .product-nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.product-nav-dropdown__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: background-color 160ms ease;
}

.product-nav-dropdown__item + .product-nav-dropdown__item {
  margin-top: 0.0625rem;
}

.product-nav-dropdown__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary-dark);
  line-height: 1.35;
  min-width: 0;
}

.product-nav-dropdown__arrow {
  flex-shrink: 0;
  font-size: 0.875rem;
  color: var(--color-text-light);
  transition: transform 160ms ease, color 160ms ease;
}

.product-nav-dropdown__item:hover,
.product-nav-dropdown__item:focus-visible {
  background: var(--color-bg-subtle);
}

.product-nav-dropdown__item:hover .product-nav-dropdown__title,
.product-nav-dropdown__item:focus-visible .product-nav-dropdown__title {
  color: var(--color-primary);
}

.product-nav-dropdown__item:hover .product-nav-dropdown__arrow,
.product-nav-dropdown__item:focus-visible .product-nav-dropdown__arrow {
  color: var(--color-primary);
  transform: translateX(3px);
}

@media (hover: hover) and (min-width: 769px) {
  .nav-item--products:hover .product-nav-dropdown,
  .nav-item--products:focus-within .product-nav-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translate(-50%, 0);
  }
}

/* ---------- Visual Placeholder ---------- */
.visual-placeholder {
  width: 100%;
  height: 100%;
  min-height: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  color: var(--color-text-light);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  background:
    linear-gradient(135deg, var(--color-bg-muted) 0%, var(--color-bg-subtle) 100%);
}

.visual-placeholder small {
  font-size: var(--text-xs);
  opacity: 0.7;
}

/* ---------- Product Showcase ---------- */
.product-showcase {
  width: 100%;
  height: 100%;
  min-height: inherit;
  margin: 0;
  padding: var(--space-md);
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-photo {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
}

.product-showcase .product-photo {
  width: auto;
  max-height: 100%;
}

.product-entry-visual .product-showcase {
  min-height: 240px;
}

.product-showcase--tall {
  min-height: 320px;
  aspect-ratio: 3 / 4;
  max-height: 420px;
}

/* ---------- Product Type Tags ---------- */
.product-type-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.type-tag {
  display: inline-block;
  padding: 0.3125rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary-mid);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  letter-spacing: 0.03em;
}

/* ---------- Certification List ---------- */
.cert-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: 1px solid var(--color-border);
}

.cert-list-item {
  padding: var(--space-xl) var(--space-2xl);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
}

.cert-list-item:nth-child(even) {
  border-right: none;
}

.cert-list-item:nth-child(3),
.cert-list-item:nth-child(4) {
  border-bottom: none;
}

.cert-list-name {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-primary-dark);
  letter-spacing: 0.01em;
}

/* ---------- Mobile Navigation ---------- */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
    position: relative;
    z-index: 152;
  }

  .header-inner {
    position: relative;
    z-index: 151;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 31, 61, 0.2);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 200ms ease, visibility 200ms ease;
    z-index: 149;
  }

  .nav-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header-wrap > .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    max-height: calc(100dvh - var(--header-height));
    background: var(--color-white);
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition:
      transform 220ms ease,
      opacity 220ms ease,
      visibility 220ms ease;
    z-index: 150;
    padding: 0;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
  }

  .site-header-wrap > .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-item-mobile-only {
    display: block;
  }

  .nav-text-mobile {
    display: inline;
  }

  .nav-text-desktop {
    display: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-link {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 52px;
    padding: var(--space-md) var(--container-pad);
    font-size: var(--text-lg);
    font-weight: 500;
    border-bottom: 1px solid var(--color-border-light);
    border-radius: 0;
    justify-content: flex-start;
  }

  .nav-item--products {
    border-bottom: 1px solid var(--color-border-light);
  }

  .nav-item--products > .nav-link--products {
    border-bottom: none;
    justify-content: space-between;
  }

  .nav-link--products-chevron {
    display: inline-block;
    width: 0.55rem;
    height: 0.55rem;
    margin-left: auto;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform 180ms ease;
  }

  .nav-item--products.is-open .nav-link--products-chevron {
    transform: rotate(225deg);
  }

  .product-nav-dropdown {
    position: static;
    left: auto;
    width: 100%;
    min-width: 0;
    max-width: none;
    margin: 0;
    padding: 0 0 0.5rem;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: var(--color-bg-subtle);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    display: none;
    transition: none;
  }

  .product-nav-dropdown::before {
    display: none;
  }

  .nav-item--products.is-open .product-nav-dropdown {
    display: block;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .product-nav-dropdown__item {
    padding: 0.625rem var(--container-pad) 0.625rem calc(var(--container-pad) + 0.75rem);
    border-radius: 0;
  }

  .product-nav-dropdown__item + .product-nav-dropdown__item {
    margin-top: 0;
    border-top: 1px solid var(--color-border-light);
  }

  .product-nav-dropdown__title {
    font-size: var(--text-base);
  }

  .nav-item-lang {
    margin-top: var(--space-sm);
    padding-top: var(--space-xs);
  }

  .nav-item-lang .nav-link--lang {
    border: none;
    min-height: 48px;
    padding: var(--space-md) var(--container-pad);
    margin: 0;
    width: 100%;
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
    justify-content: flex-start;
    border-bottom: none;
  }

  .nav-item-lang .nav-link--lang:hover {
    color: var(--color-primary);
  }

  body.nav-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    left: 0;
    right: 0;
  }

  .cert-list {
    grid-template-columns: 1fr;
  }

  .cert-list-item {
    border-right: none;
  }

  .cert-list-item:nth-child(3) {
    border-bottom: 1px solid var(--color-border);
  }
}