/* ============================================================
 * Root & Form — layout.css
 * 导航栏、移动端抽屉菜单、页脚
 * ============================================================ */

/* ---------- 站点顶栏（滚动贴顶、轻薄） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(230, 227, 217, 0.7);
}
.site-header.is-solid { background: rgba(250, 250, 247, 0.98); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: var(--header-h);
}

.nav__logo {
  font-size: var(--fs-lg);
  font-weight: 400;
  letter-spacing: var(--tracking-wider);
  white-space: nowrap;
}
.nav__logo .dot { color: var(--color-terra); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}
.nav__links a {
  position: relative;
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-soft);
  padding-block: 0.5rem;
  transition: color var(--dur) var(--ease);
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0.1rem;
  width: 100%; height: 1px;
  background: var(--color-text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__links a:hover { color: var(--color-text); }
.nav__links a:hover::after { transform: scaleX(1); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* 语言切换：无边框、无背景，仅显示缩写 */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.lang-switch__btn {
  padding: 0.25rem 0.3rem;
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--color-muted);
  border-radius: 4px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.lang-switch__btn:hover { color: var(--color-text); }
.lang-switch__btn.is-active { color: var(--color-text); font-weight: 500; }
.lang-switch__sep { color: var(--color-line); font-size: var(--fs-xs); }

/* 购物车图标 + 数量角标 */
.nav__cart {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem; height: 2rem;
  color: var(--color-text);
  transition: opacity var(--dur) var(--ease);
}
.nav__cart:hover { opacity: 0.6; }
.nav__cart .fa { font-size: 1.05rem; }
.nav__cart-count {
  position: absolute;
  top: -2px; right: -4px;
  min-width: 1.05rem; height: 1.05rem;
  padding-inline: 0.2rem;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--color-on-btn);
  background: var(--color-btn);
  border-radius: 999px;
}
.nav__cart-count.is-visible { display: inline-flex; }

/* 汉堡按钮 */
.nav__burger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.25rem; height: 2.25rem;
  font-size: 1.15rem;
  color: var(--color-text);
}

/* ---------- 移动端抽屉（全屏、极简） ---------- */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--color-bg);
  padding: calc(var(--header-h) + 1rem) var(--gutter) var(--gutter);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
}
.drawer.is-open { opacity: 1; visibility: visible; transform: none; }
.drawer__close {
  position: absolute;
  top: 1.1rem; right: var(--gutter);
  width: 2.25rem; height: 2.25rem;
  font-size: 1.15rem;
  color: var(--color-text);
}
.drawer__links { display: flex; flex-direction: column; gap: 0.35rem; }
.drawer__links a {
  display: block;
  padding-block: 1rem;
  font-size: var(--fs-2xl);
  font-weight: 300;
  letter-spacing: var(--tracking-wide);
  border-bottom: 1px solid var(--color-line);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.drawer__links a:hover { color: var(--color-terra); padding-left: 0.5rem; }
.drawer__lang {
  margin-top: 2.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}
.drawer__lang-btn {
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-wide);
  color: var(--color-muted);
  padding-block: 0.3rem;
  transition: color var(--dur) var(--ease);
}
.drawer__lang-btn:hover { color: var(--color-text); }
.drawer__lang-btn.is-active { color: var(--color-text); font-weight: 500; }
.drawer__foot { margin-top: auto; padding-top: 2rem; }

/* 抽屉打开时禁止页面滚动 */
body.drawer-open { overflow: hidden; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--color-bg-alt); }
.footer {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding-block: var(--section-space);
}
.footer__brand .nav__logo { font-size: var(--fs-lg); }
.footer__blurb {
  margin-top: 1rem;
  max-width: 34ch;
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
}
.footer__social { display: flex; gap: 1rem; margin-top: 1.5rem; }
.footer__social a {
  display: inline-flex;
  width: 2.25rem; height: 2.25rem;
  align-items: center; justify-content: center;
  font-size: 1.05rem;
  color: var(--color-text-soft);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.footer__social a:hover { color: var(--color-text); border-color: var(--color-muted); background: rgba(255,255,255,0.4); }

.footer__title {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}
.footer__list { display: flex; flex-direction: column; gap: 0.7rem; }
.footer__list a { font-size: var(--fs-sm); color: var(--color-text-soft); transition: color var(--dur) var(--ease); }
.footer__list a:hover { color: var(--color-text); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--color-line);
  font-size: var(--fs-xs);
  color: var(--color-muted);
  letter-spacing: var(--tracking-wide);
}

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .footer { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}
@media (max-width: 820px) {
  .nav__links { display: none; }
  .lang-switch { display: none; }   /* 语言切换收纳进抽屉菜单 */
  .nav__burger { display: inline-flex; }
}
@media (max-width: 520px) {
  .footer { grid-template-columns: 1fr; }
}