/* ==========================================================================
   布局：头部导航、移动端菜单、页脚
   ========================================================================== */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(7, 9, 14, 0.55);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.site-header.is-stuck {
  background: rgba(7, 9, 14, 0.86);
  border-bottom-color: var(--line);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  width: 100%;
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #ffb020);
  transition: width 0.1s linear;
}

/* ---- 品牌 ---- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--head);
}

.brand-mark {
  width: 30px;
  height: 30px;
  color: var(--accent);
}

.brand-mark svg {
  width: 100%;
  height: 100%;
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  display: inline-flex;
  gap: 0.28em;
}

.brand-text .wm-a {
  color: var(--head);
}

.brand-text .wm-b {
  color: var(--text-3);
  font-weight: 400;
}

/* ---- 主导航 ---- */
.primary-nav {
  justify-self: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  color: var(--text-2);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.nav-link:hover,
.nav-item.is-open > .nav-link,
.nav-link.is-current {
  color: var(--head);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.is-current::after {
  content: '';
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.18rem;
  height: 1.5px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-caret {
  width: 13px;
  height: 13px;
  transform: rotate(90deg);
  opacity: 0.5;
  transition: transform var(--dur-fast) var(--ease);
}

.nav-item.is-open .nav-caret {
  transform: rotate(-90deg);
}

/* ---- 下拉大面板 ---- */
.nav-panel {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  translate: -50% 0;
  min-width: 320px;
  padding: 0.75rem;
  background: rgba(14, 18, 25, 0.94);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transform-origin: top center;
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease),
    visibility var(--dur-fast);
}

.nav-item.is-open .nav-panel {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.nav-panel-inner {
  display: grid;
  gap: 2px;
}

.nav-panel-item {
  display: grid;
  gap: 0.15rem;
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-md);
  transition: background var(--dur-fast) var(--ease);
}

.nav-panel-item:hover {
  background: rgba(255, 255, 255, 0.055);
}

.nav-panel-title {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--head);
}

.nav-panel-arrow {
  width: 13px;
  height: 13px;
  color: var(--accent);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}

.nav-panel-item:hover .nav-panel-arrow {
  opacity: 1;
}

.nav-panel-desc {
  font-size: var(--fs-xs);
  color: var(--text-3);
}

/* ---- 头部操作 ---- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: transparent;
  cursor: pointer;
  padding: 0;
  place-items: center;
  align-content: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 17px;
  height: 1.5px;
  background: var(--text);
  margin-inline: auto;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}

.nav-toggle[aria-expanded='true'] span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* ---- 移动端 ---- */
@media (max-width: 1080px) {
  .primary-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: rgba(5, 7, 11, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem var(--gutter) 3rem;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease),
      visibility var(--dur-fast);
  }

  body.nav-open .primary-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

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

  .nav-link {
    justify-content: space-between;
    padding: 1rem 0.25rem;
    font-size: 1.05rem;
    font-family: var(--font-display);
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .nav-caret {
    transform: rotate(0deg);
  }

  .nav-item.is-open .nav-caret {
    transform: rotate(180deg);
  }

  .nav-panel {
    position: static;
    translate: none;
    min-width: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    padding: 0.5rem 0 1rem;
  }

  .nav-item.is-open .nav-panel {
    display: block;
  }

  .nav-toggle {
    display: grid;
  }

  .header-actions .btn {
    display: none;
  }
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  position: relative;
  padding-block: clamp(3.5rem, 7vw, 6rem) 2rem;
  background: var(--ink-950);
  border-top: 1px solid var(--line);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  padding-bottom: 3rem;
}

.footer-brand .brand {
  margin-bottom: 1.1rem;
}

.footer-desc {
  color: var(--text-3);
  font-size: var(--fs-sm);
  max-width: 34ch;
  margin-bottom: 1.5rem;
}

.footer-contact {
  display: grid;
  gap: 0.7rem;
  font-size: var(--fs-sm);
  color: var(--text-2);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.footer-contact .icon {
  width: 15px;
  height: 15px;
  margin-top: 0.32rem;
  color: var(--text-3);
}

.footer-contact a:hover {
  color: var(--accent);
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--head);
  margin-bottom: 1.1rem;
  letter-spacing: 0.01em;
}

.footer-links {
  display: grid;
  gap: 0.7rem;
}

.footer-links a {
  font-size: var(--fs-sm);
  color: var(--text-3);
  transition: color var(--dur-fast) var(--ease);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-social {
  display: grid;
  gap: 0.7rem;
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: var(--fs-sm);
  color: var(--text-3);
  transition: color var(--dur-fast) var(--ease);
}

.footer-social a:hover {
  color: var(--head);
}

/* ---- 页脚底栏（备案位） ---- */
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.25rem;
  font-size: var(--fs-xs);
  color: var(--text-3);
}

.footer-legal a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color var(--dur-fast) var(--ease);
}

.footer-legal a:hover {
  color: var(--text-2);
}

.police-icon {
  width: 13px;
  height: 13px;
}

.footer-copy {
  font-size: var(--fs-xs);
  color: var(--text-3);
}

@media (max-width: 1080px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}