/* ==========================================================================
   图腾康动 TOTEM MOTION · 头部 / 抽屉 / 页脚
   --------------------------------------------------------------------------
   2026-11-03 重定版：顶栏改为三参考站式的极简形态
   - 取消横排 mega 展开与右侧大胶囊 CTA（fftai / deeprobotics / ailisensory 均无）
   - 顶栏只保留：品牌 + 4 个细文字链接 + 搜索 + 汉堡
   - 全部产品与全部页面收进抽屉，抽屉内含静态搜索（过滤 DOM 里的产品链接，零依赖）
   ========================================================================== */

/* ==========================================================================
   1. 头部
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .93);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease),
              background var(--t-base) var(--ease),
              color var(--t-base) var(--ease);
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 20px rgba(10, 34, 57, .05);
}

/* 首页首屏：导航浮在满幅图上（fftai 式） */
.site-header--overlay {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.site-header--overlay .nav__link { color: rgba(255, 255, 255, .82); }
.site-header--overlay .nav__link:hover { color: #fff; background: rgba(255, 255, 255, .12); }
.site-header--overlay .nav__link[aria-current="page"] { color: #fff; }
.site-header--overlay .brand__name { color: #fff; }
.site-header--overlay .brand__sub { color: rgba(255, 255, 255, .62); }
.site-header--overlay .icon-btn {
  color: rgba(255, 255, 255, .82);
  border-color: rgba(255, 255, 255, .34);
}
.site-header--overlay .icon-btn:hover { color: #fff; border-color: #fff; background: rgba(255, 255, 255, .14); }
.site-header--overlay .nav-toggle { border-color: rgba(255, 255, 255, .34); background: transparent; }
.site-header--overlay .nav-toggle__bars span { background: #fff; }

.site-header--overlay.is-stuck {
  background: rgba(255, 255, 255, .95);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
}
.site-header--overlay.is-stuck .nav__link { color: var(--ink-body); }
.site-header--overlay.is-stuck .nav__link:hover { color: var(--ink); background: var(--paper-soft); }
.site-header--overlay.is-stuck .nav__link[aria-current="page"] { color: var(--ink); }
.site-header--overlay.is-stuck .brand__name { color: var(--ink); }
.site-header--overlay.is-stuck .brand__sub { color: var(--ink-mute); }
.site-header--overlay.is-stuck .icon-btn { color: var(--ink-body); border-color: var(--line-strong); }
.site-header--overlay.is-stuck .icon-btn:hover { color: var(--ink); border-color: var(--ink); background: var(--paper-soft); }
.site-header--overlay.is-stuck .nav-toggle { border-color: var(--line); background: var(--paper); }
.site-header--overlay.is-stuck .nav-toggle__bars span { background: var(--ink); }

.nav-shell {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  height: var(--header-h);
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.brand__mark {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex: 0 0 auto;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--ink);
}
.brand__sub {
  font-family: var(--font-serif);
  font-size: 9.5px;
  letter-spacing: .22em;
  color: var(--ink-mute);
  text-transform: uppercase;
}

/* ---------- 主导航：细文字链接，无下拉 ---------- */
.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  margin-left: auto;
}
.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 2px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--ink-body);
  border-radius: var(--r-sm);
  transition: color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
}
.nav__link:hover { color: var(--ink); background: var(--paper-soft); }
.nav__link[aria-current="page"] { color: var(--ink); font-weight: 700; }

/* ---------- 右侧工具区：搜索 + 汉堡 ---------- */
.nav-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: var(--sp-5);
  flex: 0 0 auto;
}
.icon-btn {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
  color: var(--ink-body);
  cursor: pointer;
  transition: color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink); background: var(--paper-soft); }
.icon-btn svg { width: 16px; height: 16px; }

/* ---------- 汉堡 ---------- */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  cursor: pointer;
  place-items: center;
}
.nav-toggle__bars { display: grid; gap: 5px; width: 17px; }
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform var(--t-base) var(--ease),
              opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ==========================================================================
   2. 抽屉：全部页面 + 全部产品 + 搜索
   ========================================================================== */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 150;
  visibility: hidden;
  pointer-events: none;
}
.drawer.is-open { visibility: visible; pointer-events: auto; }
.drawer__mask {
  position: absolute;
  inset: 0;
  background: rgba(6, 17, 32, .55);
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}
.drawer.is-open .drawer__mask { opacity: 1; }
.drawer__panel {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: min(460px, 94vw);
  background: var(--paper);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--t-base) var(--ease);
  box-shadow: -20px 0 60px rgba(10, 34, 57, .16);
}
.drawer.is-open .drawer__panel { transform: none; }
.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-5);
  border-bottom: 1px solid var(--line);
}
.drawer__close {
  width: 38px; height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  font-size: 20px;
  line-height: 1;
  color: var(--ink-mute);
  cursor: pointer;
}
.drawer__close:hover { border-color: var(--ink); color: var(--ink); }
.drawer__body { padding: var(--sp-5); overflow-y: auto; flex: 1; }

/* ---------- 搜索 ---------- */
.drawer__search { position: relative; margin-bottom: var(--sp-6); }
.drawer__search-input {
  width: 100%;
  padding: 12px 14px 12px 40px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper-soft);
  font-size: 15px;
  color: var(--ink-body);
}
.drawer__search-input:focus {
  outline: none;
  border-color: var(--brand);
  background: var(--paper);
  box-shadow: 0 0 0 3px var(--brand-wash);
}
.drawer__search-icon {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--ink-faint);
  pointer-events: none;
}
.drawer__search-status {
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--ink-mute);
  min-height: 1.4em;
}

/* ---------- 抽屉分组 ---------- */
.drawer__group { margin-bottom: var(--sp-6); }
.drawer__group-title {
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: var(--sp-2);
}
.drawer__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 16px;
  color: var(--ink);
}
.drawer__link-code {
  font-family: var(--font-serif);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-faint);
  flex: 0 0 auto;
}
.drawer__link[hidden] { display: none; }
.drawer__cta { width: 100%; justify-content: center; margin-top: var(--sp-4); }

/* ==========================================================================
   3. 页脚
   ========================================================================== */
.site-footer {
  background: var(--ink-deep);
  color: rgba(255, 255, 255, .68);
  padding-block: var(--sp-9) var(--sp-6);
  font-size: 14px;
}
.footer__top {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.2fr;
  gap: var(--sp-8);
  padding-bottom: var(--sp-8);
}
.footer__brand-name {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  letter-spacing: .01em;
}
.footer__slogan {
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--brand);
  margin-top: 6px;
}
.footer__desc {
  margin-top: var(--sp-5);
  max-width: 34em;
  line-height: 1.9;
  color: rgba(255, 255, 255, .58);
}
.footer__col-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--sp-4);
}
.footer__col ul { display: grid; gap: 11px; }
.footer__col a {
  color: rgba(255, 255, 255, .6);
  transition: color var(--t-fast) var(--ease);
}
.footer__col a:hover { color: var(--brand); }
.footer__contact-item {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: #fff !important;
}
.footer__contact-note {
  display: block;
  font-size: 12px;
  color: rgba(255, 255, 255, .45);
  margin-top: 2px;
}
.footer__legal {
  display: grid;
  gap: 10px;
  padding-block: var(--sp-6);
  border-top: 1px solid rgba(255, 255, 255, .12);
  font-size: 12.5px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .45);
}
.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-top: var(--sp-5);
  border-top: 1px solid rgba(255, 255, 255, .12);
  font-size: 13px;
  color: rgba(255, 255, 255, .48);
}
.footer__icp {
  font-family: var(--font-serif);
  letter-spacing: .06em;
}
.footer__bottom-links { display: flex; gap: var(--sp-5); }
.footer__bottom a:hover { color: var(--brand); }