.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}

/* 栏目软切换：轻遮罩 + 模糊淡出 + 柔和入场 */
.yice-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2000;
  height: 2px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.yice-progress.is-on {
  opacity: 1;
}

.yice-progress__bar {
  height: 100%;
  width: 0;
  border-radius: 0 1px 1px 0;
  background: linear-gradient(90deg, #1b65ff 0%, #5aa2ff 50%, #1b65ff 100%);
  background-size: 200% 100%;
  box-shadow: 0 0 10px rgba(27, 101, 255, 0.35);
  transition: width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.yice-progress.is-on .yice-progress__bar {
  animation: yice-progress-sheen 1.2s linear infinite;
}

.yice-progress.is-done .yice-progress__bar {
  width: 100% !important;
  transition: width 0.22s ease-out, opacity 0.3s ease 0.05s;
  animation: none;
}

@keyframes yice-progress-sheen {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .yice-progress__bar {
    transition: none !important;
    animation: none !important;
  }
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--line);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}

.nav {
  height: 100%;
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: 1.25rem;
  min-width: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  z-index: 1002;
  justify-self: start;
  margin-left: 2.5rem;
}

.logo__mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #2c7af2;
  position: relative;
  box-shadow: 0 6px 14px rgba(44, 122, 242, 0.35);
}

.logo__mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 2px solid rgba(255, 255, 255, 0.92);
  border-radius: 4px;
  border-left-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(45deg);
}

.logo__img {
  display: block;
  height: 52px;
  width: auto;
  max-width: 240px;
  object-fit: contain;
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo__text strong {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.logo__text span {
  font-size: 0.68rem;
  color: var(--muted);
  font-weight: 600;
}

.nav__menu {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  flex: none;
  min-width: 0;
  width: 100%;
  margin: 0;
  grid-column: 2;
  justify-self: stretch;
}

.nav__item {
  position: relative;
  flex-shrink: 0;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.55rem 0.95rem;
  font-size: 16px;
  font-weight: 400;
  color: var(--ink-soft);
  border-radius: 8px;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}

.nav__link:hover,
.nav__item.is-open > .nav__link,
.nav__link.is-active {
  color: var(--blue);
  background: var(--blue-soft);
}

.nav__caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.55;
  transition: transform 0.2s;
}

.nav__item.is-open .nav__caret {
  transform: rotate(180deg);
}

.mega {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-40%) translateY(4px);
  min-width: 640px;
  padding: 1.25rem;
  margin-top: 0.45rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
  z-index: 1001;
}

/* 悬停桥：盖住导航项与下拉之间的空隙，避免失焦关闭 */
.mega::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -0.55rem;
  height: 0.55rem;
}

.nav__item.is-open .mega {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-40%) translateY(0);
}

.mega--sm {
  min-width: 320px;
  transform: translateX(-20%) translateY(4px);
}

.nav__item.is-open .mega--sm {
  transform: translateX(-20%) translateY(0);
}

/* 解决方案：销售易式三栏 mega */
.mega--solutions {
  min-width: min(920px, calc(100vw - 2rem));
  left: 50%;
  transform: translateX(-45%) translateY(4px);
  padding: 1.35rem 1.5rem 1.5rem;
}

.nav__item.is-open .mega--solutions {
  transform: translateX(-45%) translateY(0);
}

.mega-sol {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 1.75rem;
}

.mega-sol h4,
.mega--solutions .mega-sol__industry > h4,
.mega--solutions .mega-sol__block > h4 {
  display: inline-flex;
  align-items: center;
  font-size: 14px !important;
  font-weight: 600;
  color: #323232 !important;
  margin: 0 0 0.65rem;
  padding: 0 0 0.45rem;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  letter-spacing: 0;
  line-height: 1.4;
}

.mega-sol__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.15rem 1.25rem;
}

.mega-sol a {
  display: block;
  padding: 0.55rem 0.35rem;
  border-radius: 8px;
  transition: background 0.2s;
}

.mega-sol a:hover {
  background: var(--blue-soft);
}

.mega-sol a strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: #333;
  margin-bottom: 0.2rem;
}

.mega-sol a span {
  display: block;
  font-size: 13px;
  color: #64748b;
  line-height: 1.45;
}

.mega-sol__side {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.mega-sol__block a + a {
  margin-top: 0.15rem;
}

.mega__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.25rem;
}

.mega__col h4 {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: #323232;
  border: 0;
  border-radius: 0;
  padding: 0 0 0.45rem;
  margin-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.mega__list a {
  display: block;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  transition: background 0.2s;
}

.mega__list a:hover {
  background: var(--blue-soft);
}

.mega__list strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: #333;
  margin-bottom: 0.15rem;
}

.mega__list span {
  display: block;
  font-size: 13px;
  color: #64748b;
  line-height: 1.45;
}

.mega__col h4 a {
  color: inherit;
}

.mega__col h4 a:hover {
  color: var(--blue);
}

a.mega__cloud {
  display: block;
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
  margin: 0 -0.65rem;
  transition: background 0.2s;
}

a.mega__cloud:hover {
  background: var(--blue-soft);
}

.mega__cloud + .mega__cloud {
  margin-top: 0.35rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line);
}

.mega__cloud strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: #333;
}

.mega__cloud p {
  font-size: 13px;
  color: #64748b;
  margin-bottom: 0.35rem;
}

.mega__cloud .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  font-size: 13px;
  color: var(--blue);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-left: 0;
  flex-shrink: 0;
  grid-column: 3;
  justify-self: end;
}

.nav__phone {
  display: none;
  align-items: baseline;
  gap: 0.25rem;
  white-space: nowrap;
  line-height: 1.2;
  cursor: default;
  user-select: text;
}

.nav__phone span {
  font-size: 13px;
  font-weight: 400;
  color: #334155;
}

.nav__phone strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.02em;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  place-items: center;
  background: var(--bg-soft);
  z-index: 1002;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: background 0.2s;
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s var(--ease), top 0.25s;
}

.menu-toggle span::before {
  top: -6px;
}
.menu-toggle span::after {
  top: 6px;
}

.menu-toggle.is-open span {
  background: transparent;
}
.menu-toggle.is-open span::before {
  top: 0;
  transform: rotate(45deg);
}
.menu-toggle.is-open span::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-mask {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
  z-index: 998;
}

.nav-mask.is-on {
  opacity: 1;
  visibility: visible;
}

@media (min-width: 1100px) {
  .nav__phone {
    display: inline-flex;
  }
}

@media (max-width: 1180px) and (min-width: 981px) {
  .nav {
    column-gap: 0.75rem;
  }

  .logo {
    margin-left: 0.5rem;
  }

  .nav__menu {
    gap: 0.35rem;
  }

  .nav__link {
    padding: 0.55rem 0.7rem;
  }
}

@media (max-width: 980px) {
  :root {
    --nav-h: 76px;
  }

  .menu-toggle {
    display: grid;
  }

  .nav {
    display: flex;
    justify-content: space-between;
    column-gap: 0;
    gap: 0.75rem;
  }

  .logo {
    justify-self: auto;
    margin-left: 0;
  }

  .logo__text span {
    display: none;
  }

  .nav__menu {
    position: fixed;
    top: 0;
    right: 0;
    left: auto;
    bottom: 0;
    width: min(360px, 88vw);
    margin: 0;
    padding: calc(var(--nav-h) + 0.75rem) 1rem 1.5rem;
    background: #fff;
    flex: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0.25rem;
    transform: translateX(104%);
    transition: transform 0.3s var(--ease);
    z-index: 999;
    overflow-y: auto;
    box-shadow: -12px 0 36px rgba(15, 23, 42, 0.12);
    grid-column: auto;
    justify-self: auto;
  }

  .nav__actions {
    margin-left: auto;
    grid-column: auto;
    justify-self: auto;
  }

  body.is-menu-open .nav__menu {
    transform: translateX(0);
  }

  .nav__link {
    width: 100%;
    justify-content: space-between;
    padding: 0.9rem 0.85rem;
    white-space: normal;
  }

  .mega,
  .mega--sm,
  .mega--solutions {
    position: static;
    min-width: 0;
    transform: none !important;
    box-shadow: none;
    border: none;
    border-radius: 10px;
    background: var(--bg-soft);
    padding: 0.5rem 0.65rem 0.85rem;
    margin: 0 0 0.35rem;
    display: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav__item.is-open .mega {
    display: block;
  }

  .mega__grid,
  .mega-sol {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .mega-sol__grid {
    grid-template-columns: 1fr;
  }

  .nav__actions .btn {
    display: none;
  }
}