/* ==========================================================================
   layout.css —— 页面骨架：容器、顶部细条、页头导航、Hero、区块、页脚、栅格
   参考成都产业集团门户：顶部 utility bar + 大气导航 + 栏目化首页 + 分组页脚
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部细条 (utility bar) ---------- */
.topbar {
  background: var(--c-primary-dark);
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 38px;
}
.topbar__slogan { letter-spacing: 1px; }
.topbar__links { display: flex; align-items: center; gap: 18px; }
.topbar__links a { color: rgba(255, 255, 255, 0.85); transition: color 0.2s; }
.topbar__links a:hover { color: #fff; }
.topbar__tel { color: var(--c-gold); }

/* ---------- 区块 ---------- */
.section { padding: 80px 0; }
.section--soft { background: var(--c-bg-soft); }
.section--deep { background: var(--c-bg-deep); color: #fff; }
.section--deep h2,
.section--deep h3 { color: #fff; }

.section__head {
  max-width: 780px;
  margin: 0 auto 54px;
  text-align: center;
}
.section__eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--c-accent);
  font-weight: 700;
  margin-bottom: 12px;
}
.section__title { margin-bottom: 12px; }
.section__lead {
  color: var(--c-text-soft);
  font-size: 16px;
  margin: 0;
}
.section--deep .section__eyebrow { color: var(--c-gold); }
.section--deep .section__lead { color: rgba(255, 255, 255, 0.78); }

/* ---------- 通用栅格 ---------- */
.grid { display: grid; gap: 26px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
/* 五大板块：宽屏一行五个，窄屏自动换行 */
.grid--5 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

@media (max-width: 960px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4, .grid--5 { grid-template-columns: 1fr; }
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--c-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand__logo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}

/* ---------- 集中式品牌 logo 占位 ----------
   与 .brand__logo / .partner__img 使用完全相同的盒模型尺寸，
   无矢量源时顶替 <img>，补到矢量后替换回来布局零跳动。
   样式集中在本文件，改一处即全站生效。 ---------- */
.logo-ph {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  flex-shrink: 0;
  overflow: hidden;
  text-align: center;
  color: var(--c-muted);
  background:
    repeating-linear-gradient(
      45deg,
      #f4f6f9,
      #f4f6f9 5px,
      #edf0f5 5px,
      #edf0f5 10px
    );
  border: 1px dashed #c3ccd9;
  user-select: none;
}
.logo-ph__mark {
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1.1;
  letter-spacing: 0.5px;
}
.logo-ph__hint {
  font-size: 9px;
  letter-spacing: 1.5px;
  color: #a3adbd;
  line-height: 1;
  margin-top: 2px;
}
/* 页头品牌位：与 .brand__logo 同尺寸 44x44 圆形 */
.logo-ph--brand {
  width: 44px;
  height: 44px;
  border-radius: 50%;
}
.logo-ph--brand .logo-ph__mark { font-size: 15px; }
/* 合作伙伴位：与 .partner__logo img 同尺寸（max-height 48 / max-width 90%） */
.logo-ph--partner {
  width: 90%;
  height: 48px;
  max-width: 90%;
  max-height: 48px;
  border-radius: 8px;
}
.logo-ph--partner .logo-ph__mark { font-size: 13px; }
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand__mark {
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--c-primary);
}
.brand__sub {
  font-size: 9.5px;
  letter-spacing: 0.5px;
  color: var(--c-muted);
}

/* 导航 */
.nav { display: flex; gap: 4px; }
.nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  font-size: 15.5px;
  color: var(--c-text-soft);
  white-space: nowrap;
  transition: color 0.2s;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 3px;
  border-radius: 2px;
  background: var(--c-accent);
  transform: scaleX(0);
  transition: transform 0.22s ease;
}
.nav__link:hover { color: var(--c-primary); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--c-accent); font-weight: 700; }
.nav__link.is-active::after { transform: scaleX(1); }

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  padding: 12px 10px;
  flex-direction: column;
  justify-content: space-between;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
}
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow);
    padding: 8px 0;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav__link { padding: 14px 24px; }
  .nav__link::after { display: none; }
  .nav__link.is-active { background: var(--c-bg-soft); }
}

/* ---------- Hero 大图横幅 ---------- */
.hero {
  position: relative;
  color: #fff;
  padding: 110px 0 96px;
  overflow: hidden;
}
.hero--photo {
  background-image:
    linear-gradient(100deg, rgba(8, 28, 63, 0.94) 0%, rgba(13, 43, 92, 0.82) 45%, rgba(26, 74, 145, 0.58) 100%),
    url("../img/hero-chengdu.jpg");
  background-size: cover;
  background-position: center;
}
.hero__brand {
  font-size: 18px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.95);
  letter-spacing: 2px;
  margin-bottom: 18px;
  padding-left: 14px;
  border-left: 3px solid var(--c-accent);
}
.intro-para {
  font-size: 17px;
  max-width: 920px;
  margin: 0 auto;
  line-height: 2;
}
.intro-para + .intro-para { margin-top: 18px; }
.hero__eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--c-gold);
  font-weight: 700;
  margin-bottom: 16px;
}
.hero__title {
  color: #fff;
  font-size: 36px;
  line-height: 1.3;
  margin: 0 0 22px;
  max-width: 780px;
  font-weight: 800;
  letter-spacing: 1px;
}
.section__slogan {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin: 0 0 18px;
}
.slogan-chip {
  text-align: center;
  padding: 10px 22px;
  background: rgba(200, 16, 46, 0.06);
  border-left: 3px solid var(--c-accent);
  border-radius: 0 8px 8px 0;
  min-width: 132px;
}
.slogan-chip__key {
  font-size: 18px;
  font-weight: 800;
  color: var(--c-accent);
  letter-spacing: 3px;
  line-height: 1.2;
}
.slogan-chip__cap {
  font-size: 12.5px;
  color: var(--c-muted);
  margin-top: 4px;
  letter-spacing: 2px;
}
.hero__lead {
  color: rgba(255, 255, 255, 0.86);
  font-size: 18px;
  max-width: 640px;
  margin: 0 0 28px;
}
.hero__tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.hero__tag {
  font-size: 14px;
  padding: 7px 16px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

/* ---------- 数字统计条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0;
  text-align: center;
}
.stat { padding: 14px 18px; position: relative; }
.stat + .stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22%;
  height: 56%;
  border-left: 1px solid rgba(255, 255, 255, 0.18);
}
.stat__num {
  font-size: 34px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}
.stat__label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 6px;
}
@media (max-width: 640px) {
  .stats { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
  .stat + .stat::before { display: none; }
  .hero__title { font-size: 30px; }
}

/* ---------- 图标宫格（参考"走进产投"） ---------- */
.icongrid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.icongrid__item {
  display: block;
  text-align: center;
  padding: 30px 16px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  transition: transform 0.22s, box-shadow 0.22s, background 0.22s, color 0.22s;
}
.icongrid__item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  background: var(--c-primary);
  color: #fff;
}
.icongrid__icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--c-accent-soft);
  color: var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  transition: background 0.22s, color 0.22s;
}
.icongrid__item:hover .icongrid__icon { background: #fff; color: var(--c-primary); }
.icongrid__title { font-size: 17px; font-weight: 700; color: var(--c-primary); margin-bottom: 4px; }
.icongrid__item:hover .icongrid__title { color: #fff; }
.icongrid__desc { font-size: 13px; color: var(--c-muted); }
.icongrid__item:hover .icongrid__desc { color: rgba(255, 255, 255, 0.82); }
@media (max-width: 960px) { .icongrid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .icongrid { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 页面横幅 ---------- */
.page-banner {
  background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary-light));
  color: #fff;
  padding: 58px 0;
}
.page-banner__title { color: #fff; margin: 0 0 8px; font-size: 32px; }
.page-banner__sub {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  letter-spacing: 1px;
}
/* Banner 配图：统一蓝色渐变压暗，保证白字可读。更换图片只需改 url 路径。 */
.page-banner--about {
  background-image: linear-gradient(120deg, rgba(8, 28, 63, 0.9), rgba(13, 43, 92, 0.72)), url("../img/cityscape.png");
}
.page-banner--business {
  background-image: linear-gradient(120deg, rgba(8, 28, 63, 0.9), rgba(13, 43, 92, 0.72)), url("../img/commercial_building.png");
}
.page-banner--solutions {
  background-image: linear-gradient(120deg, rgba(8, 28, 63, 0.9), rgba(13, 43, 92, 0.72)), url("../img/cloud_datacenter.png");
}
.page-banner--partners {
  background-image: linear-gradient(120deg, rgba(8, 28, 63, 0.9), rgba(13, 43, 92, 0.72)), url("../img/office_hq.png");
}
.page-banner--contact {
  background-image: linear-gradient(120deg, rgba(8, 28, 63, 0.9), rgba(13, 43, 92, 0.72)), url("../img/cityscape.png");
}
.page-banner--news {
  background-image: linear-gradient(120deg, rgba(8, 28, 63, 0.9), rgba(13, 43, 92, 0.72)), url("../img/lab_research.png");
}
.page-banner--photo { background-size: cover; background-position: center; }

/* ---------- 底部行动条 ---------- */
.cta {
  background: var(--c-bg-deep);
  color: #fff;
  padding: 70px 0;
  text-align: center;
}
.cta h2 { color: #fff; font-size: 30px; margin-bottom: 14px; }
.cta p { color: rgba(255, 255, 255, 0.78); max-width: 720px; margin: 0 auto 26px; font-size: 17px; }
.cta .btn-row { justify-content: center; }

/* ---------- 滚动进入动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 页脚（分组） ---------- */
.site-footer {
  background: var(--c-primary-dark);
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding: 56px 24px 40px;
}
.site-footer__title {
  color: #fff;
  font-size: 16px;
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 3px solid var(--c-accent);
}
.site-footer__slogan {
  color: var(--c-gold);
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.site-footer__intro { font-size: 13.5px; line-height: 1.8; color: rgba(255, 255, 255, 0.62); }
.site-footer__list { list-style: none; padding: 0; margin: 0; }
.site-footer__list li { margin-bottom: 10px; }
.site-footer__list a { color: rgba(255, 255, 255, 0.72); transition: color 0.2s; }
.site-footer__list a:hover { color: #fff; }
.site-footer__col p { margin: 0 0 8px; color: rgba(255, 255, 255, 0.72); }
.site-footer__social { list-style: none; padding: 0; margin: 0 0 12px; }
.site-footer__social li { margin-bottom: 10px; }
.site-footer__social a {
  display: inline-flex; align-items: center; gap: 9px;
  color: rgba(255, 255, 255, 0.78);
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  font-size: 14px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.site-footer__social a:hover {
  color: #fff;
  border-color: var(--c-accent);
  background: rgba(207, 34, 47, 0.16);
}
.site-footer__social a svg {
  width: 18px; height: 18px;
  flex-shrink: 0;
}

/* ---------- 扁平图标工具类 ---------- */
.ico { width: 20px; height: 20px; flex-shrink: 0; display: inline-block; vertical-align: middle; }
.ico--wechat { color: #07C160; }
.ico--douyin { color: #FE2C55; }
.ico--channels { color: #12B7AB; }
.ico--web { color: #3B7CF5; }
.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 0;
  font-size: 13px;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
}
.site-footer__bottom p { margin: 0; }

@media (max-width: 900px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; gap: 32px; }
  .hero { padding: 84px 0 72px; }
}
@media (max-width: 768px) {
  .section { padding: 54px 0; }
  .page-banner { padding: 40px 0; }
  .page-banner__title { font-size: 25px; }
}
@media (max-width: 560px) {
  .site-footer__inner { grid-template-columns: 1fr; }
}