/* ==========================================================================
   云南鸿创物联科技有限公司 · 响应式样式
   Hongchuang IoT — Responsive Stylesheet
   断点：1200 / 1024 / 860 / 640 / 420
   ========================================================================== */

/* ---------- ≤1200px 大屏笔记本 ---------- */
@media (max-width: 1200px) {
  :root {
    --container: 100%;
  }

  .hero-grid {
    gap: 40px;
  }
  .float-card.fc-a {
    left: -14px;
  }
  .float-card.fc-b {
    right: -8px;
  }

  .footer-top {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 36px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-brand p {
    max-width: 620px;
  }
}

/* ---------- ≤1024px 平板横屏 / 导航折叠 ---------- */
@media (max-width: 1024px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 12px 20px 26px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--c-line);
    box-shadow: 0 22px 46px rgba(11, 35, 80, 0.12);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-14px);
    transition: opacity var(--t) var(--ease), transform var(--t) var(--ease),
      visibility var(--t) var(--ease);
  }
  .main-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .main-nav > ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .main-nav > ul > li > a {
    padding: 14px 12px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }
  .main-nav > ul > li > a::after {
    display: none;
  }
  .main-nav > ul > li > a.active {
    background: var(--c-primary-soft);
  }

  .nav-cta {
    margin-top: 14px;
    padding-top: 18px;
    border-top: 1px solid var(--c-line);
  }
  .nav-cta .btn {
    width: 100%;
  }

  /* 布局收敛 */
  .hero {
    padding: calc(var(--header-h) + 60px) 0 78px;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }
  .hero-lead {
    max-width: none;
  }
  .hero-visual {
    max-width: 660px;
  }
  .float-card.fc-a {
    left: 6px;
    top: 6%;
  }
  .float-card.fc-b {
    right: 6px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-row {
    grid-template-columns: 1fr;
  }
  .feature {
    border-right: 0;
    border-bottom: 1px solid var(--c-line);
    padding: 36px 30px;
  }
  .feature:last-child {
    border-bottom: 0;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .split.rev .split-media {
    order: 0;
  }

  .device-list {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .big-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .shot-side-panel {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .wall-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- ≤860px 平板竖屏 / 手机横屏 ---------- */
@media (max-width: 860px) {
  .section {
    padding: 76px 0;
  }
  .section-sm {
    padding: 58px 0;
  }
  .section-head {
    margin-bottom: 44px;
  }

  .page-hero {
    padding: calc(var(--header-h) + 48px) 0 52px;
  }

  .console-side {
    grid-template-columns: 1fr;
  }
  .console-list {
    grid-template-columns: repeat(2, 1fr);
    display: grid;
  }

  .footer-top {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    padding-bottom: 44px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }

  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .field-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .form-card {
    padding: 26px 22px;
  }
  .faq-item {
    padding: 22px 22px;
  }
  .faq-item p {
    padding-left: 0;
  }

  .timeline {
    padding-left: 28px;
  }
  .tl-item::before {
    left: -28px;
    width: 17px;
    height: 17px;
    box-shadow: 0 0 0 4px rgba(25, 101, 253, 0.1);
  }
}

/* ---------- ≤640px 手机 ---------- */
@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }
  .container {
    padding: 0 18px;
  }

  .section {
    padding: 62px 0;
  }
  .section-head {
    margin-bottom: 36px;
  }

  .brand-mark {
    width: 37px;
    height: 37px;
  }
  .brand-text strong {
    font-size: 15.5px;
  }
  .brand-text em {
    font-size: 9.5px;
    letter-spacing: 0.14em;
  }

  .hero {
    padding: calc(var(--header-h) + 44px) 0 60px;
  }
  .hero-lead {
    font-size: 16px;
  }
  .hero-actions {
    gap: 11px;
  }
  .hero-actions .btn {
    flex: 1 1 164px;
    height: 48px;
    padding: 0 18px;
  }
  .hero-meta {
    gap: 8px 18px;
    font-size: 12.5px;
  }
  .hero-meta b {
    font-size: 14px;
  }

  .float-card {
    display: none;
  }
  .console-body {
    padding: 12px;
  }
  .console-stats {
    grid-template-columns: 1fr 1fr;
  }
  .console-stats div:last-child {
    grid-column: 1 / -1;
  }
  .tile-grid {
    gap: 6px;
  }

  .grid {
    gap: 18px;
  }
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .card {
    padding: 26px 22px;
  }
  .card-num {
    top: 22px;
    right: 22px;
  }

  .big-grid,
  .wall-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .stat {
    padding: 26px 14px;
  }
  .stat .lbl {
    font-size: 13.5px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .site-footer {
    padding-top: 58px;
  }

  .footer-bottom {
    align-items: center;
    gap: 10px;
  }

  .table-wrap {
    border-radius: var(--radius-sm);
  }
  table.cmp th,
  table.cmp td {
    padding: 13px 14px;
    font-size: 13.5px;
  }

  .media-box {
    aspect-ratio: 16 / 11;
  }

  .shot-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .shot-tabs button {
    white-space: nowrap;
  }
  .shot-stage {
    padding: 12px;
    min-height: 300px;
  }

  .to-top {
    right: 16px;
    bottom: 16px;
    width: 42px;
    height: 42px;
  }

  .cta-band {
    padding: 52px 0;
  }
  .cta-actions {
    width: 100%;
  }
  .cta-actions .btn {
    flex: 1 1 150px;
  }
}

/* ---------- ≤420px 小屏手机 ---------- */
@media (max-width: 420px) {
  .hero h1 {
    font-size: 27px;
  }
  .brand-text em {
    display: none;
  }
  .stats {
    grid-template-columns: 1fr;
  }
  .big-grid,
  .wall-grid {
    grid-template-columns: 1fr;
  }
  .console-list {
    grid-template-columns: 1fr;
  }
  .hero-meta {
    flex-direction: column;
    gap: 7px;
  }
}

/* ---------- 打印 ---------- */
@media print {
  .site-header,
  .to-top,
  .cta-band,
  .nav-toggle {
    display: none !important;
  }
  body {
    color: #000;
  }
  .hero,
  .page-hero,
  .site-footer,
  .section-navy {
    background: #fff !important;
  }
  .hero h1,
  .page-hero h1,
  .section-navy h2,
  .section-navy h3 {
    color: #000 !important;
  }
}