/**
 * Kaisuo — mobile / touch layout (max-width: 900px)
 * Load after site.css, b2b-pages.css, theme-qinfeng.css
 */

@media (max-width: 900px) {
  :root {
    --header-h: 56px;
    --page-gutter: 16px;
  }

  html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }

  body {
    overflow-x: clip;
  }

  .container {
    width: min(1200px, calc(100% - var(--page-gutter) * 2));
  }

  /* —— Header / topbar —— */
  body > header {
    --header-h: 56px;
  }

  .topbar {
    --topbar-fs: 11px;
    --logo-full-h: 36px;
    flex-wrap: wrap;
    gap: 8px 10px;
    padding-block: 8px;
    min-height: var(--header-h);
  }

  .topbar .logo {
    flex: 1 1 auto;
    min-width: 0;
  }

  .logo-full {
    max-width: min(200px, 48vw);
  }

  .topbar-tools {
    flex: 0 0 auto;
    gap: 6px 8px;
  }

  .header-cta {
    display: inline-flex !important;
    padding: 8px 12px;
    font-size: 10px;
    letter-spacing: 0.08em;
  }

  .lang-box {
    font-size: 10px;
  }

  .lang-box select {
    max-width: 7.5rem;
    padding: 6px 8px;
    font-size: 11px;
  }

  .nav-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    color: var(--ink);
    cursor: pointer;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
  }

  .nav-menu-btn__bars {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
  }

  body.kaisuo-nav-open .nav-menu-btn__bars {
    box-shadow: none;
    transform: rotate(45deg);
  }

  body.kaisuo-nav-open .nav-menu-btn__bars::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transform: rotate(-90deg);
  }

  .nav-menu-btn {
    position: relative;
  }

  .nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 199;
    background: rgba(3, 5, 8, 0.55);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.22s ease, visibility 0.22s ease;
    border: none;
    padding: 0;
    cursor: pointer;
  }

  body.kaisuo-nav-open .nav-backdrop {
    opacity: 1;
    visibility: visible;
  }

  .primary-nav {
    position: fixed;
    z-index: 200;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    flex: none;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 12px var(--page-gutter) max(20px, env(safe-area-inset-bottom));
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 4px;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background: var(--bg-elevated);
    border-top: 1px solid var(--line);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
    transform: translateX(105%);
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.28s ease, visibility 0.28s ease;
  }

  html[dir="rtl"] .primary-nav {
    transform: translateX(-105%);
  }

  body.kaisuo-nav-open {
    overflow: hidden;
  }

  body.kaisuo-nav-open .primary-nav {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
  }

  .primary-nav > a,
  .primary-nav .nav-dropdown__toggle {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 14px;
    font-size: 13px;
    letter-spacing: 0.04em;
    border-radius: 8px;
    white-space: normal;
  }

  .primary-nav .nav-dropdown {
    display: block;
    width: 100%;
  }

  .primary-nav .nav-dropdown__menu {
    position: static;
    min-width: 0;
    width: 100%;
    margin: 0 0 8px;
    padding: 4px 0 4px 8px;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    display: none;
  }

  .primary-nav .nav-dropdown.is-open .nav-dropdown__menu {
    display: block;
  }

  .primary-nav .nav-dropdown__menu a {
    min-height: 44px;
    padding: 10px 14px 10px 20px;
    font-size: 14px;
    white-space: normal;
  }

  .primary-nav > a[href*="admin"] {
    display: none;
  }

  /* —— Typography & sections —— */
  h1 {
    font-size: clamp(26px, 7vw, 34px);
  }

  h2 {
    font-size: clamp(22px, 5.5vw, 28px);
  }

  section {
    padding: 32px 0;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .section-head p {
    max-width: none;
  }

  .cols-2,
  .cols-3,
  .cols-4 {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    padding: 28px 0 20px;
  }

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

  .actions .btn,
  .actions .btn.primary {
    text-align: center;
    justify-content: center;
    min-height: 44px;
    padding: 12px 18px;
  }

  .card {
    padding: 16px;
  }

  .card-media {
    margin: -16px -16px 12px;
  }

  .card-media img {
    height: 180px;
  }

  /* —— Footer —— */
  .site-footer {
    padding: 32px 0 24px;
  }

  .site-footer .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-qr-row {
    justify-content: center;
  }

  /* —— Forms —— */
  .inquiry-form input,
  .inquiry-form textarea {
    font-size: 16px;
  }

  .inquiry-form button {
    width: 100%;
    justify-self: stretch;
    min-height: 48px;
  }

  /* —— Float + chat —— */
  .kaisuo-float {
    bottom: max(12px, env(safe-area-inset-bottom));
    inset-inline-end: max(8px, env(safe-area-inset-end));
  }

  .kaisuo-site-chat__sheet {
    width: calc(100vw - 16px);
    max-height: min(85vh, 640px);
    margin-inline-end: 0;
    border-radius: 16px 16px 10px 10px;
  }

  .kaisuo-site-chat__fields {
    grid-template-columns: 1fr;
  }

  .kaisuo-site-chat__send {
    min-height: 48px;
  }
}

@media (max-width: 900px) {
  /* Homepage banner (qinfeng) */
  body.theme-qinfeng .ks-cinema {
    height: auto;
    min-height: min(70vh, 480px);
    max-height: none;
  }

  body.theme-qinfeng .ks-cinema__content {
    padding: 28px var(--page-gutter);
  }

  body.theme-qinfeng .ks-cinema__title {
    font-size: clamp(24px, 7vw, 36px);
    line-height: 1.2;
  }

  body.theme-qinfeng .ks-cinema__lead {
    font-size: 15px;
    margin-bottom: 24px;
  }

  body.theme-qinfeng .ks-cinema__actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin-inline: auto;
  }

  body.theme-qinfeng .ks-btn {
    width: 100%;
    justify-content: center;
    min-height: 48px;
  }

  body.theme-qinfeng .ks-heading {
    padding: 40px 0 28px;
  }

  body.theme-qinfeng .ks-stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  body.theme-qinfeng .ks-adv-card {
    min-height: 260px;
  }

  body.theme-qinfeng .ks-bleed-img {
    max-height: 36vh;
  }

  body.theme-qinfeng .ks-bleed-img img {
    height: 36vh;
  }
}

@media (max-width: 520px) {
  body.theme-qinfeng .ks-stat-grid {
    grid-template-columns: 1fr;
  }

  body.theme-qinfeng .ks-trust-strip__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 900px) {
  .home-banner--split {
    min-height: 0;
  }

  .home-banner__title {
    max-width: none;
  }

  .product-detail-card__media {
    height: auto;
    min-height: min(52vw, 280px);
    max-height: 360px;
  }

  .factory-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .product-sub-grid {
    grid-template-columns: 1fr !important;
    gap: 12px;
  }

  .explore-grid {
    grid-template-columns: 1fr;
  }

  .page-hero h1 {
    font-size: clamp(24px, 6.5vw, 32px);
  }
}

@media (min-width: 901px) {
  .nav-menu-btn,
  .nav-backdrop {
    display: none !important;
  }
}