/* ============================================
   layout.css — 容器 / 头部 / 导航 / 页脚布局
   ============================================ */

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.section {
  padding: var(--space-8) 0;
}

.section--soft {
  background: var(--color-bg-soft);
}

/* ---------- 头部 / 导航 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.header.is-scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.logo__mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: grid;
  place-items: center;
  color: var(--color-white);
  flex-shrink: 0;
}

.logo__name {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--color-heading);
  white-space: nowrap;
}

.logo__name span {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 400;
  color: var(--color-text-light);
  letter-spacing: 1px;
}

/* 主导航 */
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  white-space: nowrap;
}

.nav__link {
  flex-shrink: 0;
  position: relative;
  padding: var(--space-2) 0;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  width: 100%;
}

/* 头部右侧操作区：语言切换 + 预约按钮 */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
  padding: 0.4rem 0.8rem;
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--color-text-light);
  transition: var(--transition);
}

.lang-switch span {
  white-space: nowrap;
}

.lang-switch:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* 头部搜索框 */
.header-search {
  position: relative;
  display: flex;
  align-items: center;
  flex: 0 1 220px;
}

.header-search__icon {
  position: absolute;
  left: 0.85rem;
  color: var(--color-text-light);
  pointer-events: none;
}

.header-search__input {
  width: 100%;
  height: 40px;
  padding: 0 1rem 0 2.5rem;
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  font-size: var(--fs-xs);
  color: var(--color-text);
  background: var(--color-bg);
  transition: var(--transition);
}

.header-search__input::placeholder {
  color: var(--color-text-lighter);
}

.header-search__input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(14, 116, 144, 0.12);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-heading);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle__bar {
  position: relative;
}

.nav-toggle__bar::before {
  position: absolute;
  top: -7px;
}

.nav-toggle__bar::after {
  position: absolute;
  top: 7px;
}

.nav-toggle.is-open .nav-toggle__bar {
  background: transparent;
}

.nav-toggle.is-open .nav-toggle__bar::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__bar::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ---------- 页脚 ---------- */
.footer {
  background: #0b2230;
  color: rgba(255, 255, 255, 0.72);
  padding: var(--space-7) 0 0;
  font-size: var(--fs-sm);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
}

.footer__brand .logo__name {
  color: var(--color-white);
}

.footer__desc {
  margin-top: var(--space-4);
  line-height: 1.8;
}

.footer__title {
  color: var(--color-white);
  font-size: var(--fs-base);
  margin-bottom: var(--space-4);
}

.footer__list li {
  margin-bottom: var(--space-3);
}

.footer__list a:hover {
  color: var(--color-white);
}

.footer__contact li {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: var(--space-4) 0;
  text-align: center;
  font-size: var(--fs-xs);
}

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: var(--transition);
  z-index: 90;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--color-primary-dark);
}