/* ??????? */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.site-header__main {
  background: #fff;
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 40px;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__img {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
}

.site-logo__name {
  font-size: 20px;
  font-weight: 700;
  color: #1e3a8a;
  letter-spacing: 0.5px;
}

/* ?? */
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: block;
  padding: 20px 14px;
  text-decoration: none;
  color: #333;
  font-size: 16px;
  font-weight: 500;
  transition: color 0.2s;
  white-space: nowrap;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: #3b82f6;
}

/* ?????? */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  padding: 32px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  margin-top: 8px;
}

.site-nav__item--mega:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  margin-top: 0;
}

.mega-menu__inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
}

.mega-menu--wide {
  width: 720px;
}

.mega-menu__inner--3 {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.mega-menu__inner--2 {
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.mega-menu__col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #1e3a8a;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e5e7eb;
}

.mega-menu__col a {
  display: block;
  padding: 8px 0;
  color: #666;
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
}

.mega-menu__col a:hover {
  color: #3b82f6;
  padding-left: 8px;
}

/* ????? */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.header-action-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  text-decoration: none;
  color: #666;
  font-size: 14px;
  border-radius: 6px;
  transition: all 0.2s;
}

.header-action-link:hover {
  background: #f3f4f6;
  color: #3b82f6;
}

.header-action-icon {
  font-size: 16px;
}

.btn-consult {
  padding: 10px 24px;
  background: #3b82f6;
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-consult:hover {
  background: #2563eb;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* ??????? */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 6px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: #333;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ??? */
@media (max-width: 1024px) {
  .site-header__inner {
    gap: 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    background: #fff;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav__link {
    padding: 14px 12px;
  }

  .mega-menu {
    position: static;
    transform: none;
    width: 100%;
    box-shadow: none;
    padding: 16px;
    margin-top: 0;
    background: #f9fafb;
    border-radius: 6px;
    display: none;
  }

  .site-nav__item--mega.is-open .mega-menu {
    display: block;
    opacity: 1;
    visibility: visible;
  }

  .mega-menu__inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .site-header__actions {
    display: none;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    padding: 0 16px;
    height: 56px;
  }

  .site-logo__img {
    width: 36px;
    height: 36px;
  }

  .site-logo__name {
    font-size: 18px;
  }
}

/* 高级导航视觉升级 */
.site-header {
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(228, 233, 242, 0.9);
  box-shadow: 0 12px 40px rgba(8, 20, 43, 0.08);
  backdrop-filter: blur(18px);
}

.site-header__main {
  background: transparent;
}

.site-header__inner {
  height: 72px;
}

.site-logo__img {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(16, 42, 92, 0.16);
}

.site-logo__name {
  color: #102a5c;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.site-nav__link {
  position: relative;
  color: #24324a;
  font-size: 15px;
  font-weight: 600;
  padding: 25px 14px;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 17px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #c8a45d, #2563eb);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.22s ease;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: #102a5c;
}

.site-nav__link:hover::after,
.site-nav__link.is-active::after {
  transform: scaleX(1);
}

.mega-menu {
  border: 1px solid rgba(228, 233, 242, 0.92);
  border-radius: 20px;
  box-shadow: 0 28px 70px rgba(8, 20, 43, 0.16);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(18px);
}

.mega-menu__col h4 {
  color: #102a5c;
  border-bottom-color: rgba(200, 164, 93, 0.35);
}

.mega-menu__col a {
  color: #536179;
  border-radius: 10px;
}

.mega-menu__col a:hover {
  color: #102a5c;
  background: rgba(37, 99, 235, 0.06);
  padding-left: 10px;
}

.header-action-link {
  color: #536179;
  border-radius: 999px;
}

.header-action-link:hover {
  background: rgba(37, 99, 235, 0.07);
  color: #102a5c;
}

.btn-consult {
  border-radius: 999px;
  background: linear-gradient(135deg, #102a5c 0%, #2563eb 100%);
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.22);
  font-weight: 700;
}

.btn-consult:hover {
  background: linear-gradient(135deg, #08142b 0%, #1f4e9e 100%);
  box-shadow: 0 16px 32px rgba(16, 42, 92, 0.28);
}

@media (max-width: 1024px) {
  .site-nav {
    top: 72px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 24px 50px rgba(8, 20, 43, 0.12);
  }

  .site-nav__link {
    padding: 14px 12px;
  }

  .site-nav__link::after {
    display: none;
  }
}