/* ==========================================================================
   GEOER · 导航（公共，6 页共用 · B 方案由 js/global/site.js 注入）
   画布节点：首页 19:362 / 其他页面 111:39 · 111:56 · 111:73 · 111:90 · 144:3
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: var(--bg-base);
  border-bottom: 1px solid var(--border-base);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 76px;
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--pad-page);
}

/* ------------------------------------------------------------------ Logo */

.site-header .brand {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.site-header .brand img {
  width: 119px;
  height: 44px;
}

/* -------------------------------------------------------------- 链接组 */

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-muted);
  transition: color var(--dur-fast) var(--ease-out);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--brand);
}

/* --------------------------------------------------------- 右侧操作组 */

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 0 0 auto;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 26px;
  border-radius: var(--radius-pill);
  background: var(--brand);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease-out);
}

.nav-cta:hover {
  background: var(--brand-hover);
}

.nav-lang {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-faint);
  transition: color var(--dur-fast) var(--ease-out);
}

.nav-lang:hover {
  color: var(--brand);
}

/* ------------------------------------------------------------- 汉堡按钮 */

.nav-toggle {
  display: none; /* ≥900 隐藏 */
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  color: var(--text-primary);
}

.nav-toggle:hover {
  background: var(--brand-soft);
}

.nav-toggle__bars {
  position: relative;
  width: 20px;
  height: 14px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 1.8px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease-out),
    opacity var(--dur-base) var(--ease-out);
}

.nav-toggle__bars::before {
  top: 0;
}

.nav-toggle__bars::after {
  bottom: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* --------------------------------------------------------- 手机端抽屉 */

.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  visibility: hidden;
  pointer-events: none;
}

.nav-drawer__scrim {
  position: absolute;
  inset: 0;
  background: rgba(16, 25, 50, 0.32);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}

.nav-drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--drawer-w);
  max-width: 86vw;
  height: 100%;
  padding: 88px 24px 32px;
  background: var(--bg-base);
  border-left: 1px solid var(--border-base);
  transform: translateX(100%);
  transition: transform var(--dur-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}

.nav-drawer.is-open {
  visibility: visible;
  pointer-events: auto;
}

.nav-drawer.is-open .nav-drawer__scrim {
  opacity: 1;
}

.nav-drawer.is-open .nav-drawer__panel {
  transform: none;
}

.nav-drawer__panel a {
  display: block;
  padding: 14px 4px;
  font-size: 16px;
  color: var(--text-body);
  border-bottom: 1px solid var(--border-base);
}

.nav-drawer__panel a:last-child {
  border-bottom: 0;
}

.nav-drawer__panel .nav-cta {
  margin-top: 20px;
  justify-content: center;
  border-bottom: 0;
}

body.is-locked {
  overflow: hidden;
}

/* --------------------------------------------------------------- 断点 */

@media (max-width: 899px) {
  .site-header__inner {
    height: 64px;
  }

  .site-header .brand img {
    width: 96px;
    height: 36px;
  }

  /* 导航链接收进抽屉：只保留 Logo + CTA + 汉堡 */
  .nav-links,
  .nav-lang {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

@media (min-width: 900px) {
  .nav-drawer {
    display: none;
  }
}

@media (max-width: 639px) {
  .nav-actions {
    gap: 10px;
  }

  .nav-cta {
    padding: 9px 18px;
    font-size: 14px;
  }
}