/* ==========================================================================
   财姐姐集团 / Cai Jiejie Group — responsive rules · 响应式规则
   Breakpoints: 1024px (tablet landscape) · 900px (tablet) ·
                700px (large phone) · 480px (small phone)
   断点：1024px（横屏平板）· 900px（平板）· 700px（大屏手机）· 480px（小屏手机）
   Verified against 375 / 768 / 1024 / 1440 widths.
   已在 375 / 768 / 1024 / 1440 宽度下验证。
   ========================================================================== */

/* --------------------------------------------------------------------------
   ≤ 1024px — tablet landscape / small laptop · 横屏平板 / 小笔记本
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .main-nav ul {
    gap: 18px;
  }

  .hero-inner {
    gap: 36px;
  }

  .service-detail-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .service-sidebar {
    position: static;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* --------------------------------------------------------------------------
   ≤ 900px — tablet portrait: switch to the CSS-only mobile menu
             · 竖屏平板：切换到纯 CSS 移动端菜单
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .main-nav,
  .header-actions {
    display: none;
  }

  .mobile-nav {
    display: block;
    margin-left: auto;
  }

  .hero {
    padding: 72px 0 64px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual {
    max-width: 520px;
  }

  .hero-subtitle {
    max-width: none;
  }

  .service-grid,
  .advantage-grid,
  .article-grid,
  .philosophy-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 40px;
  }

  .process-step::after {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .section {
    padding: 72px 0;
  }

  .about-split {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-visual {
    max-width: 520px;
  }

  .about-copy {
    order: -1;
  }

  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* --------------------------------------------------------------------------
   ≤ 700px — large phones · 大屏手机
   -------------------------------------------------------------------------- */
@media (max-width: 700px) {
  .solution-grid,
  .service-grid,
  .advantage-grid,
  .article-grid,
  .philosophy-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 56px 0 40px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .form-row,
  .contact-form .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .contact-form-wrap {
    padding: 24px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .service-detail-cta {
    flex-direction: column;
  }

  .service-detail-cta .btn {
    width: 100%;
  }

  .error-actions {
    flex-direction: column;
  }

  .error-actions .btn {
    width: 100%;
  }
}

/* --------------------------------------------------------------------------
   ≤ 480px — small phones (375px baseline) · 小屏手机（375px 基线）
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }

  .section {
    padding: 60px 0;
  }

  .hero {
    padding: 56px 0 56px;
  }

  .hero-title {
    font-size: 1.9rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-chips li {
    font-size: 12.5px;
    padding: 5px 12px;
  }

  .service-card,
  .solution-card,
  .article-card {
    padding: 22px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    row-gap: 36px;
  }

  .faq-item summary {
    font-size: 0.98rem;
    padding: 16px 2px;
  }

  .faq-answer {
    padding: 0 0 18px 2px;
  }

  .cta-band {
    padding: 56px 0;
  }

  .cta-inner .btn {
    width: 100%;
  }

  .page-band {
    padding: 40px 0 36px;
  }

  .contact-info {
    padding: 24px;
  }

  .service-detail-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}