/* ==========================================================================
   layout.css — Header / Footer / 容器 / 栅格 / 面包屑 / 响应式
   ========================================================================== */

/* --------------------------------------------------------------------------
   容器 & 区块
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.container--narrow {
  max-width: 880px;
}

.section {
  position: relative;
  padding: 96px 0;
}

.section--sm {
  padding: 64px 0;
}

.section--alt {
  background: var(--c-bg);
}

.section--dark {
  background: var(--c-dark);
  color: var(--c-text-inverse);
}

.section--dark .section__title {
  color: #fff;
}

.section--dark .section__desc,
.section--dark .text-2 {
  color: var(--c-text-inverse-2);
}

.section--dark .section__eyebrow {
  color: var(--c-accent);
}

.section__head {
  max-width: 720px;
  margin-bottom: 56px;
}

.section__head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section__head--center .section__eyebrow {
  justify-content: center;
}

.section__head--row {
  max-width: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.section__head--row > div {
  max-width: 720px;
}

.section__eyebrow {
  margin-bottom: 16px;
}

.section__title {
  color: var(--c-text);
}

.section__desc {
  margin-top: 16px;
  font-size: 17px;
  color: var(--c-text-2);
}

/* --------------------------------------------------------------------------
   栅格
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: 24px;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: 64px;
}

@media (max-width: 992px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: 1fr; gap: 40px; }
  .section { padding: 72px 0; }
  .section__head { margin-bottom: 40px; }
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
  .grid { gap: 16px; }
  .section { padding: 56px 0; }
  .section--sm { padding: 40px 0; }
  .section__head--row { flex-direction: column; align-items: flex-start; }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  transition: background var(--dur), box-shadow var(--dur), border-color var(--dur), transform var(--dur);
}

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

/* 首页 Hero 之上：透明深色态 */
.site-header--transparent:not(.is-scrolled) {
  background: transparent;
  border-bottom-color: var(--c-border-dark);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  position: relative;
  height: 40px;
}

.site-header__logo img {
  height: 40px;
  width: auto;
  transition: opacity var(--dur);
}

.site-header__logo .logo--light {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.site-header--transparent:not(.is-scrolled) .site-header__logo .logo--dark { opacity: 0; }
.site-header--transparent:not(.is-scrolled) .site-header__logo .logo--light { opacity: 1; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  flex-shrink: 0;
  padding: 8px 12px;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  transition: color var(--dur), background var(--dur);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--c-primary);
}

.site-nav__link.is-active {
  color: var(--c-primary);
}

.site-nav__link.is-active::after {
  transform: scaleX(1);
}

.site-header--transparent:not(.is-scrolled) .site-nav__link {
  color: var(--c-text-inverse);
}

.site-header--transparent:not(.is-scrolled) .site-nav__link:hover,
.site-header--transparent:not(.is-scrolled) .site-nav__link.is-active {
  color: #fff;
}

.site-header--transparent:not(.is-scrolled) .site-nav__link::after {
  background: var(--c-accent);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.site-header__cta {
  height: 40px;
  padding: 0 20px;
  font-size: 14px;
}

/* 窄桌面：压缩导航间距 */
@media (max-width: 1200px) and (min-width: 993px) {
  .site-nav__link { padding: 8px 10px; font-size: 14px; }
  .site-nav__link::after { left: 10px; right: 10px; }
  .site-header__cta { padding: 0 14px; }
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--c-text);
}

.site-header--transparent:not(.is-scrolled) .nav-toggle {
  color: var(--c-text-inverse);
}

.nav-toggle__bar {
  position: absolute;
  left: 11px;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease-out), opacity var(--dur), top var(--dur);
}

.nav-toggle__bar:nth-child(1) { top: 14px; }
.nav-toggle__bar:nth-child(2) { top: 21px; }
.nav-toggle__bar:nth-child(3) { top: 28px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { top: 21px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { top: 21px; transform: rotate(-45deg); }

.nav-backdrop {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 90;
  background: rgba(8, 20, 38, 0.55);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity var(--dur);
}

body.nav-open .nav-backdrop {
  display: block;
  opacity: 1;
}

body.nav-open {
  overflow: hidden;
}

@media (max-width: 992px) {
  .nav-toggle {
    display: block;
  }

  .site-header__actions .site-header__cta {
    display: none;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    z-index: 95;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 16px 32px;
    background: var(--c-surface);
    border-left: 1px solid var(--c-border);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--dur) var(--ease-out);
  }

  .site-nav.is-open {
    transform: translateX(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link,
  .site-header--transparent:not(.is-scrolled) .site-nav__link {
    display: block;
    padding: 14px 16px;
    font-size: 16px;
    color: var(--c-text);
    border-bottom: 1px solid var(--c-border);
    border-radius: 0;
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link.is-active,
  .site-header--transparent:not(.is-scrolled) .site-nav__link.is-active {
    color: var(--c-primary);
    background: var(--c-primary-soft);
  }

  .site-nav .site-nav__mobile-cta {
    display: inline-flex;
    margin-top: 20px;
  }

  /* 抽屉打开时 Header 回到白底 */
  body.nav-open .site-header {
    background: var(--c-surface);
    border-bottom-color: var(--c-border);
  }

  body.nav-open .site-header .site-nav__link { color: var(--c-text); }
  body.nav-open .site-header .nav-toggle { color: var(--c-text); }
  body.nav-open .site-header .site-header__logo .logo--dark { opacity: 1; }
  body.nav-open .site-header .site-header__logo .logo--light { opacity: 0; }
}

@media (min-width: 993px) {
  .site-nav .site-nav__mobile-cta {
    display: none;
  }
}

/* 内页 main 需避让固定 Header；首页 Hero 自己处理 */
.site-main {
  padding-top: var(--header-h);
}

body[data-page="home"] .site-main {
  padding-top: 0;
}

/* --------------------------------------------------------------------------
   面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-small);
  color: var(--c-text-inverse-2);
}

.breadcrumb a {
  color: var(--c-text-inverse-2);
}

.breadcrumb a:hover {
  color: #fff;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  opacity: 0.5;
}

.breadcrumb [aria-current="page"] {
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  background: var(--c-dark);
  color: var(--c-text-inverse-2);
  font-size: var(--fs-small);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-accent) 40%, var(--c-primary) 60%, transparent);
  opacity: 0.6;
}

.site-footer__main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 0.8fr 1.1fr;
  gap: 40px;
  padding: 72px 0 56px;
}

.site-footer__brand img {
  height: 40px;
  width: auto;
  margin-bottom: 20px;
}

.site-footer__name {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
}

.site-footer__name-en {
  display: block;
  margin-top: 4px;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--c-text-inverse-2);
}

.site-footer__tagline {
  margin-top: 16px;
  max-width: 300px;
  line-height: 1.7;
}

.site-footer__title {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
}

.site-footer__links li + li {
  margin-top: 10px;
}

.site-footer__links a {
  color: var(--c-text-inverse-2);
  transition: color var(--dur), padding-left var(--dur);
}

.site-footer__links a:hover {
  color: var(--c-accent);
  padding-left: 4px;
}

.site-footer__contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.site-footer__contact li + li {
  margin-top: 12px;
}

/* 页脚联系图标由 layout.js 内联 SVG，stroke=currentColor */
.site-footer__contact svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--c-accent);
  opacity: 0.9;
}

.site-footer__contact a {
  color: var(--c-text-inverse-2);
}

.site-footer__contact a:hover {
  color: var(--c-accent);
}

.site-footer__qr {
  width: 120px;
  height: 120px;
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-text-inverse-2);
  border: 1px dashed rgba(230, 238, 248, 0.3);
  border-radius: var(--radius-sm);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 24px 0;
  border-top: 1px solid var(--c-border-dark);
  font-size: 13px;
}

.site-footer__bottom p {
  margin: 0;
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.site-footer__meta a {
  color: var(--c-text-inverse-2);
}

.site-footer__meta a:hover {
  color: var(--c-accent);
}

@media (max-width: 1200px) {
  .site-footer__main {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }

  .site-footer__contact-col {
    grid-column: 1 / -1;
    display: flex;
    gap: 40px;
    align-items: flex-start;
  }

  .site-footer__contact-col .site-footer__qr {
    margin-top: 0;
  }
}

@media (max-width: 768px) {
  .site-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
    padding: 56px 0 40px;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }

  .site-footer__contact-col {
    flex-direction: column;
    gap: 20px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .site-footer__main {
    grid-template-columns: 1fr;
  }
}