/* ==========================================================================
   layout.css — 页头 / 导航 / 页脚 / 页面骨架 / 栅格
   ========================================================================== */

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--navy-900);
  color: #b9c9d6;
  font-size: .78rem;
  letter-spacing: .02em;
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--topbar-h);
  padding-block: 6px;
}
.topbar__brands {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.topbar__label { color: #7f95a6; }
.topbar__brands b { color: #fff; font-weight: 600; letter-spacing: .04em; }
.topbar__sep { color: #3d5566; }
.topbar__contact { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.topbar__contact a { color: #dce6ee; }
.topbar__contact a:hover { color: #fff; }
.topbar__contact svg { width: 13px; height: 13px; margin-right: 6px; vertical-align: -2px; }

/* ---------- 主导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(255, 255, 255, .97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header.is-scrolled { box-shadow: 0 6px 18px -14px rgba(8, 25, 42, .5); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--navy-900);
}
.logo:hover { color: var(--navy-900); }
.logo__mark { width: 40px; height: 40px; flex: 0 0 auto; }
.logo__text { display: grid; line-height: 1.1; }
.logo__name {
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: .06em;
}
.logo__en {
  font-family: var(--font-num);
  font-size: .58rem;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--steel-500);
  margin-top: 3px;
}

.main-nav { margin-left: auto; }
.main-nav__list { display: flex; align-items: center; gap: 2px; }
.main-nav__item { position: relative; }
.main-nav__link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 10px 13px;
  font-size: .92rem;
  font-weight: 500;
  color: var(--ink-2);
  white-space: nowrap;
}
.main-nav__link:hover { color: var(--accent); }
.main-nav__link[aria-current="page"] { color: var(--navy-900); font-weight: 700; }
.main-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: 2px;
  height: 2px;
  background: var(--accent);
}
.main-nav__link svg { width: 11px; height: 11px; opacity: .6; }

/* 下拉菜单 */
.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 230px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity .16s ease, transform .16s ease, visibility .16s;
}
.main-nav__item:hover .submenu,
.main-nav__item:focus-within .submenu {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.submenu a {
  display: block;
  padding: 9px 14px;
  font-size: .88rem;
  color: var(--ink-2);
}
.submenu a:hover { background: var(--surface-2); color: var(--accent); }

.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--navy-800);
}
.nav-toggle svg { width: 20px; height: 20px; }

/* 移动端菜单 */
.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--surface);
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
}
.mobile-nav.is-open { display: block; }
.mobile-nav__list { padding: 10px 0 18px; }
.mobile-nav__link {
  display: block;
  padding: 12px 24px;
  font-size: .98rem;
  color: var(--ink-2);
  border-bottom: 1px solid var(--surface-2);
}
.mobile-nav__link[aria-current="page"] { color: var(--accent); font-weight: 700; }
.mobile-nav__sub { padding: 6px 24px 10px 36px; display: grid; gap: 2px; }
.mobile-nav__sub a { padding: 6px 0; font-size: .86rem; color: var(--ink-3); }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--navy-900);
  color: #b6c6d3;
  padding: 64px 0 0;
  margin-top: 0;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.25fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .logo { color: #fff; }
.footer-brand .logo__name { color: #fff; }
.footer-brand .logo__en { color: #7f95a6; }
.footer-brand p {
  margin-top: 18px;
  font-size: .86rem;
  line-height: 1.9;
  color: #93a8b8;
  max-width: 320px;
}
.footer-brands {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.footer-brands span {
  padding: 3px 9px;
  border: 1px solid #2b465c;
  font-family: var(--font-num);
  font-size: .66rem;
  letter-spacing: .1em;
  color: #a8bccb;
}
.footer-col h2 {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col li + li { margin-top: 9px; }
.footer-col a { font-size: .86rem; color: #a5b8c7; }
.footer-col a:hover { color: #fff; }

.footer-contact li {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: 10px;
  font-size: .86rem;
  line-height: 1.8;
  color: #a5b8c7;
}
.footer-contact li + li { margin-top: 12px; }
.footer-contact svg { width: 15px; height: 15px; margin-top: 4px; color: var(--accent); }
.footer-contact a { color: #d6e2eb; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid #1d3448;
  font-size: .78rem;
  color: #7f95a6;
}
.footer-bottom__links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-bottom a { color: #7f95a6; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative;
  background: var(--navy-900);
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to right, #000 30%, transparent 85%);
  -webkit-mask-image: linear-gradient(to right, #000 30%, transparent 85%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: 56px;
  align-items: center;
  padding-block: 84px 72px;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 12px;
  border: 1px solid #2e4d66;
  background: rgba(255, 255, 255, .04);
  font-family: var(--font-num);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #cfdde8;
}
.hero__eyebrow i {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
}
.hero h1 {
  margin-top: 24px;
  color: #fff;
  font-size: clamp(2rem, 1.25rem + 2.6vw, 3.25rem);
  line-height: 1.22;
  letter-spacing: -.015em;
}
.hero h1 em {
  font-style: normal;
  color: #e79a63;
}
.hero__lead {
  margin-top: 22px;
  max-width: 560px;
  font-size: 1rem;
  line-height: 1.95;
  color: #b9cbd9;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 46px;
  border-top: 1px solid #22405a;
  padding-top: 26px;
}
.hero__stat {
  padding-right: 34px;
  margin-right: 34px;
  border-right: 1px solid #22405a;
}
.hero__stat:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.hero__stat b {
  display: block;
  font-family: var(--font-num);
  font-size: 1.9rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.1;
}
.hero__stat b span { font-size: 1rem; color: #93a8b8; margin-left: 2px; }
.hero__stat small {
  display: block;
  margin-top: 6px;
  font-size: .76rem;
  letter-spacing: .04em;
  color: #8fa5b6;
}

.hero__art {
  position: relative;
  border: 1px solid #24445f;
  background: linear-gradient(180deg, #0f2b41, #0a1f31);
}
.hero__art img { width: 100%; height: auto; }
.hero__art figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  border-top: 1px solid #24445f;
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #7f97a9;
}
.hero__art figcaption b { color: #d9a075; font-weight: 600; }

/* 品牌授权条 */
.brand-strip {
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.brand-strip__inner {
  display: flex;
  align-items: center;
  gap: 40px;
  padding: 22px 0;
  flex-wrap: wrap;
}
.brand-strip__label {
  font-size: .78rem;
  color: var(--ink-3);
  letter-spacing: .04em;
  padding-right: 40px;
  border-right: 1px solid var(--line);
}
.brand-strip__list {
  display: flex;
  align-items: center;
  gap: 44px;
  flex-wrap: wrap;
  flex: 1;
}
.brand-strip__item {
  font-family: var(--font-num);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--steel-600);
}
.brand-strip__item small {
  display: block;
  font-family: var(--font-sans);
  font-size: .64rem;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--steel-300);
  margin-top: 2px;
}

/* ---------- 内页页头 ---------- */
.page-head {
  position: relative;
  background: var(--navy-800);
  color: #fff;
  padding: 46px 0 40px;
  overflow: hidden;
}
.page-head::after {
  content: "";
  position: absolute;
  right: -60px; top: -60px;
  width: 320px; height: 320px;
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: 50%;
}
.page-head__inner { position: relative; z-index: 1; }
.page-head h1 { color: #fff; margin-top: 14px; font-size: clamp(1.6rem, 1.2rem + 1.4vw, 2.2rem); }
.page-head p {
  margin-top: 12px;
  max-width: 720px;
  color: #a9bdcb;
  font-size: .94rem;
  line-height: 1.85;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  color: #8ba2b3;
}
.breadcrumb a { color: #a9bdcb; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: #46627a; }
.breadcrumb [aria-current="page"] { color: #dbe6ee; }

/* ---------- 通用栅格 ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }

/* 侧栏布局 */
.with-sidebar {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}
.sidebar { position: sticky; top: calc(var(--header-h) + 20px); display: grid; gap: 20px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .hero__inner { grid-template-columns: minmax(0, 1fr); gap: 40px; padding-block: 64px 56px; }
  .hero__art { max-width: 640px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .with-sidebar { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: static; }
}

@media (max-width: 960px) {
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section { padding: 60px 0; }
}

@media (max-width: 640px) {
  .container { padding-inline: 18px; }
  .topbar__brands { display: none; }
  .topbar__inner { justify-content: center; }
  .hero__inner { padding-block: 48px 44px; }
  .hero__stats { gap: 18px 0; }
  .hero__stat { padding-right: 20px; margin-right: 20px; }
  .hero__stat b { font-size: 1.5rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .brand-strip__inner { gap: 16px; }
  .brand-strip__label { border-right: 0; padding-right: 0; width: 100%; }
  .brand-strip__list { gap: 24px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; }
  .page-head { padding: 34px 0 30px; }
}

/* 侧栏布局：无论 DOM 顺序如何，侧栏固定在左列 */
.with-sidebar > .sidebar { grid-column: 1; grid-row: 1; }
.with-sidebar > :not(.sidebar) { grid-column: 2; grid-row: 1; }

@media (max-width: 1100px) {
  .with-sidebar > .sidebar,
  .with-sidebar > :not(.sidebar) { grid-column: auto; grid-row: auto; }
}

/* 中等宽度下压缩导航，避免溢出 */
@media (min-width: 961px) and (max-width: 1080px) {
  .header-inner { gap: 16px; }
  .main-nav__link { padding: 10px 9px; font-size: .88rem; }
}
/* 小屏隐藏页头按钮，入口移入抽屉菜单 */
@media (max-width: 480px) {
  .header-actions .btn { display: none; }
  .logo__name { font-size: 1.05rem; }
}
.mobile-nav__cta { padding: 6px 24px 22px; }

/* 栅格子项允许收缩，避免小屏被内容撑宽 */
.grid-2 > *, .grid-3 > *, .grid-4 > *,
.with-sidebar > *, .hero__inner > * { min-width: 0; }