/* Copyright (c) 2026 Chinaready. All rights reserved. */

/* ==========================================================================
   Site header — transparent over dark hero, solid after scroll > 24px
   (spec §5: Header 状态切换, 0.4s transition).
   ========================================================================== */

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: var(--cr-z-sticky);
  transition:
    background-color 0.4s var(--cr-ease-standard),
    box-shadow 0.4s var(--cr-ease-standard),
    color 0.4s var(--cr-ease-standard);
  color: #fff;
  background: transparent;
}

.site-header.is-solid {
  color: var(--cr-text-primary);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--cr-border);
}

.site-header__inner {
  width: min(var(--site-container), 100% - var(--site-gutter) * 2);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--cr-space-6);
  height: 76px;
}

/* Logo — two stacked variants crossfade with the header state */
.site-header__logo {
  position: relative;
  display: block;
  width: 168px;
  height: 36px;
  flex: none;
}

.site-header__logo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
  transition: opacity 0.4s var(--cr-ease-standard);
}

.site-header__logo img[data-variant='light'] {
  opacity: 1;
}

.site-header__logo img[data-variant='dark'] {
  opacity: 0;
}

.site-header.is-solid .site-header__logo img[data-variant='light'] {
  opacity: 0;
}

.site-header.is-solid .site-header__logo img[data-variant='dark'] {
  opacity: 1;
}

/* Ask — static control; stays on the mobile header bar next to the burger */
.site-header__ask {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 4px 14px;
  border: 1px solid currentColor;
  border-radius: var(--cr-radius-button);
  background: transparent;
  color: inherit;
  font-family: inherit;
  font-size: 15px;
  font-weight: var(--cr-fw-semibold);
  cursor: pointer;
  opacity: 0.92;
}

.site-header__ask:hover {
  opacity: 1;
}

.site-header__ask:focus-visible {
  outline: var(--cr-border-focus);
  outline-offset: 2px;
}

@media (min-width: 921px) {
  .site-header__ask {
    display: none;
  }
}

/* Desktop nav */
.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--cr-space-6);
}

.site-header__link {
  font-size: 15px;
  font-weight: var(--cr-fw-medium);
  text-decoration: none;
  opacity: 0.92;
  transition: opacity var(--cr-dur-base) var(--cr-ease-standard);
  background: none;
  border: 0;
  color: inherit;
  font-family: inherit;
  cursor: pointer;
  padding: 8px 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.site-header__link:hover {
  opacity: 1;
}

.site-header__caret {
  font-size: 10px;
  transition: transform 0.25s var(--cr-ease-standard);
}

.site-header__dropdown.is-open .site-header__caret {
  transform: rotate(180deg);
}

/* Services dropdown */
.site-header__dropdown {
  position: relative;
}

.site-header__panel {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  translate: -50% 0;
  width: 380px;
  background: #fff;
  color: var(--cr-text-primary);
  border-radius: var(--cr-radius-card);
  box-shadow: var(--cr-shadow-overlay);
  border: 1px solid var(--cr-border);
  padding: var(--cr-space-3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity 0.25s var(--cr-ease-standard),
    transform 0.25s var(--cr-ease-standard),
    visibility 0.25s;
  z-index: var(--cr-z-dropdown);
}

.site-header__dropdown.is-open .site-header__panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Log in dropdown — right-align the panel so it does not overflow the viewport */
.site-header__dropdown--login .site-header__panel {
  left: auto;
  right: 0;
  translate: 0;
  width: 320px;
}

.site-header__panel-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--cr-radius-button);
  text-decoration: none;
  transition: background-color var(--cr-dur-fast) var(--cr-ease-standard);
}

.site-header__panel-item:hover {
  background: var(--cr-surface);
}

.site-header__panel-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--cr-radius-button);
  background: var(--cr-surface);
  color: var(--cr-brand-blue);
}

.site-header__panel-item:hover .site-header__panel-icon {
  background: #fff;
  color: var(--cr-brand-blue);
}

.site-header__panel-copy {
  min-width: 0;
  flex: 1;
}

.site-header__panel-title {
  display: block;
  font-weight: var(--cr-fw-semibold);
  font-size: 15px;
}

.site-header__panel-summary {
  display: block;
  font-size: var(--cr-fs-small);
  color: var(--cr-text-secondary);
  margin-top: 2px;
}

.site-header__panel-footer {
  margin-top: var(--cr-space-2);
  padding: 12px 14px;
  border-top: 1px solid var(--cr-border);
}

/* Right-side actions group — keeps Log in adjacent to the primary CTA */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--cr-space-5);
  margin-inline-start: auto;
}

/* CTA */
.site-header__cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 22px;
  border-radius: var(--cr-radius-button);
  font-size: 15px;
  font-weight: var(--cr-fw-semibold);
  text-decoration: none;
  background: var(--cr-brand-blue);
  color: #fff;
  transition: background-color var(--cr-dur-base) var(--cr-ease-standard);
}

.site-header__cta:hover {
  background: var(--cr-brand-blue-hover);
  color: #fff;
}

/* Mobile toggle */
.site-header__burger {
  display: none;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
  padding: 10px;
  margin-right: -10px;
}

.site-header__burger-box {
  display: block;
  width: 24px;
  height: 16px;
  position: relative;
}

.site-header__burger-box::before,
.site-header__burger-box::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.25s var(--cr-ease-standard), top 0.25s var(--cr-ease-standard);
}

.site-header__burger-box::before {
  top: 2px;
}

.site-header__burger-box::after {
  top: 12px;
}

.site-header.is-mobile-open .site-header__burger-box::before {
  top: 7px;
  transform: rotate(45deg);
}

.site-header.is-mobile-open .site-header__burger-box::after {
  top: 7px;
  transform: rotate(-45deg);
}

/* Mobile menu */
.site-header__mobile {
  display: none;
}

@media (max-width: 920px) {
  .site-header__nav,
  .site-header__actions {
    display: none;
  }

  .site-header__ask {
    margin-inline-start: auto;
  }

  .site-header__burger {
    display: block;
  }

  .site-header.is-mobile-open {
    color: var(--cr-text-primary);
    background: #fff;
  }

  .site-header__mobile {
    display: block;
    overflow: hidden;
    max-height: 0;
    background: #fff;
    color: var(--cr-text-primary);
    transition: max-height 0.35s var(--cr-ease-standard);
  }

  .site-header.is-mobile-open .site-header__mobile {
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    border-top: 1px solid var(--cr-border);
  }

  .site-header__mobile-inner {
    padding: var(--cr-space-4) var(--cr-space-5) var(--cr-space-6);
    display: flex;
    flex-direction: column;
  }

  .site-header__mobile-group {
    font-size: var(--cr-fs-caption);
    font-weight: var(--cr-fw-semibold);
    letter-spacing: var(--cr-tracking-wide);
    text-transform: uppercase;
    color: var(--cr-text-secondary);
    margin: var(--cr-space-4) 0 var(--cr-space-2);
  }

  .site-header__mobile-link {
    padding: 12px 0;
    text-decoration: none;
    font-size: 17px;
    font-weight: var(--cr-fw-medium);
    border-bottom: 1px solid var(--cr-border);
  }

  .site-header__mobile-sub {
    display: block;
    font-size: var(--cr-fs-caption);
    font-weight: var(--cr-fw-regular, 400);
    color: var(--cr-text-secondary);
    margin-top: 2px;
  }

  .site-header__mobile-cta {
    margin-top: var(--cr-space-5);
  }
}