/* 移动端响应式（全站共用，需在页面样式之后加载）
   覆盖 about / products / scenarios / mai-ai / category / 首页 的大字号与多列网格 */

/* 导航右侧操作区与汉堡按钮（桌面端隐藏按钮） */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(148, 163, 184, .06);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: .3s;
}

.nav.open .nav-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav.open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.nav.open .nav-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 图片 LOGO：后台「站点设置 → 网站 LOGO」(site_logo) 有值时显示图片，否则回退文字 LOGO */
.logo-img {
  display: block;
  height: 40px;
  width: auto;
  max-width: 240px;
  object-fit: contain;
}

/* ===== 平板 ===== */
@media (max-width: 960px) {
  .container {
    padding: 0 24px;
  }

  .hero {
    padding: 150px 0 96px;
  }

  .hero h1 {
    font-size: 56px;
    letter-spacing: 1px;
  }

  .hero-sub {
    font-size: 17px;
    max-width: 100%;
    padding: 0 16px;
  }

  .section {
    padding: 90px 0;
  }

  .section-head {
    margin-bottom: 56px;
  }

  .section-title {
    font-size: 38px;
  }

  .section-sub {
    font-size: 16px;
  }

  /* 移动端：显示汉堡按钮，菜单改为下拉面板 */
  .nav-toggle {
    display: inline-flex;
  }

  .menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    background: rgba(10, 15, 30, .97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    max-height: 80vh;
    overflow-y: auto;
  }

  .nav.open .menu {
    display: flex;
  }

  .menu a {
    padding: 15px 24px;
    font-size: 15px;
    border-bottom: 1px solid rgba(148, 163, 184, .08);
  }

  .menu a:last-child {
    border-bottom: none;
  }

  .menu a.active {
    color: var(--text);
  }

  /* 四列 / 两列网格塌缩为两列 */
  .stats,
  .culture,
  .svc-features,
  .scenario-grid,
  .ai-grid,
  .summary .stats {
    grid-template-columns: 1fr 1fr;
  }

  /* 左右分栏改单列 */
  .intro-wrap,
  .join-wrap,
  .svc-head,
  .demo-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .intro-left h2 {
    font-size: 36px;
  }

  .join-left h3 {
    font-size: 32px;
  }

  .svc-info h3 {
    font-size: 40px;
  }

  .svc-visual {
    height: 280px;
  }

  .ai-card ul {
    grid-template-columns: 1fr;
  }

  .stat .v {
    font-size: 44px;
  }

  .summary .stat .v {
    font-size: 36px;
  }

  .summary h3 {
    font-size: 28px;
  }

  /* 发展历程时间线改单列 */
  .timeline::before {
    display: none;
  }

  .tl-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px 0;
  }

  .tl-item::before {
    left: 8px;
    top: 26px;
    transform: none;
  }

  .tl-item:nth-child(odd) .tl-content,
  .tl-item:nth-child(even) .tl-content {
    grid-column: 1;
    text-align: left;
    padding: 0 0 0 28px;
  }

  .tl-item:nth-child(odd) .tl-empty,
  .tl-item:nth-child(even) .tl-empty {
    display: none;
  }

  .tl-content .y {
    font-size: 28px;
  }

  .tl-content h4 {
    font-size: 18px;
  }

  .demo-right {
    height: auto;
  }

  .footer-bottom {
    flex-wrap: wrap;
    gap: 8px;
  }
}

/* ===== 手机 ===== */
@media (max-width: 600px) {
  .container {
    padding: 0 18px;
  }

  .logo-img {
    height: 32px;
    max-width: 180px;
  }

  .hero {
    padding: 90px 0 5px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-kicker {
    font-size: 11px;
    letter-spacing: 2px;
    padding: 7px 14px;
  }

  .hero-sub {
    font-size: 15px;
    margin-top: 8px;
  }

  .hero-cta {
    margin-top: 16px;
    flex-wrap: nowrap;
  }

  .section {
    padding: 12px 0;
  }

  .section-head {
    margin-bottom: 14px;
  }

  .section-title {
    font-size: 28px;
  }

  .section-sub {
    font-size: 15px;
  }

  .biz-card {
    padding: 16px 16px;
    position: relative;
  }

  .biz-card h3 {
    position: absolute;
    top: 8px;
    left: 100px;
    margin-top: 15px;
    font-size: 28px;
  }

  .biz-card .sub {
    position: absolute;
    top: 50px;
    left: 100px;
  }

  .biz-card .value {
    margin-top: 10px;
    padding-top: 10px;
  }

  /* 网格塌缩为单列 */
  .stats,
  .culture,
  .svc-features,
  .scenario-grid,
  .ai-grid {
    grid-template-columns: 1fr 1fr;
  }

  #why,
  #process,
  #about,
  #news,
  .stats {
    display: none;
  }

  .contact-wrap {
    padding: 20px;
    gap: 10px;
  }

  .contact-left h2 {
    font-size: 28px;
  }

  .contact-left p {
    margin-top: 8px;
  }

  .footer {
    margin-top: 12px;
    padding: 10px 0 40px;
  }

  .intro-left h2 {
    font-size: 28px;
  }

  .join-left h3 {
    font-size: 26px;
  }

  .join-right {
    grid-template-columns: 1fr;
  }

  .svc-info h3 {
    font-size: 32px;
  }

  .svc-info .value {
    font-size: 20px;
  }

  .svc-visual {
    height: 220px;
  }

  .feat h4 {
    font-size: 18px;
  }

  .cv h4 {
    font-size: 20px;
  }

  .scenario {
    padding: 32px 26px;
  }

  .scenario h3 {
    font-size: 24px;
  }

  .ai-card {
    padding: 32px 24px;
  }

  .ai-card h3 {
    font-size: 24px;
  }

  .ai-card .num {
    font-size: 48px;
    top: 18px;
    right: 22px;
  }

  .demo-left h3 {
    font-size: 26px;
  }

  .stat .v {
    font-size: 40px;
  }

  .summary {
    padding: 40px 24px;
  }

  .summary h3 {
    font-size: 24px;
  }

  .summary .stat .v {
    font-size: 32px;
  }

  /* 行动按钮在手机上整行、可堆叠 */
  .btn {
    display: flex;
    width: 100%;
    justify-content: center;
    box-sizing: border-box;
  }

  .btn-ghost {
    margin-left: 0;
    /* margin-top: 12px; */
  }

  .tri-strip {
    margin-top: 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    display: none;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

/* @media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
} */