/* ========================================
   UAV Enterprise Survey Website
   Responsive Styles (Mobile-First)
   ======================================== */

/* ----------------------------------------
   Breakpoints:
   - Mobile: < 576px
   - Tablet: 576px - 991px
   - Desktop: 992px - 1199px
   - Large Desktop: >= 1200px
   ---------------------------------------- */

/* ----------------------------------------
   Mobile Styles (Base - < 576px)
   ---------------------------------------- */

/* Header Mobile */
.header-inner {
  height: 74px;
}

.logo-icon {
  width: min(270px, calc(100vw - 118px));
  height: 58px;
  background-size: contain;
}

.logo-text {
  font-size: var(--font-size-base);
}

.menu-toggle {
  display: flex;
}

.nav {
  position: fixed;
  top: 74px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  z-index: var(--z-sticky);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  display: flex !important;
  flex-direction: column !important;
  visibility: hidden;
  opacity: 0;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav.active {
  transform: translateX(0) !important;
  visibility: visible !important;
  opacity: 1 !important;
}

.nav-list {
  flex-direction: column;
  gap: 0;
  flex: 1;
  overflow-y: auto;
}

.nav-item {
  border-bottom: 1px solid var(--color-border);
}

.nav-link {
  display: block;
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-lg);
}

.nav-link::after {
  display: none;
}

.nav-dropdown {
  position: static;
  transform: none;
  box-shadow: none;
  padding: 0 0 var(--spacing-md) var(--spacing-md);
  background-color: var(--color-bg-light);
  opacity: 1;
  visibility: visible;
  margin-top: 0;
}

.nav-dropdown-item {
  padding: var(--spacing-sm) 0;
}

/* Mobile Dropdown - 移动端始终显示 */
.nav .dropdown-menu,
.dropdown-menu {
  position: static !important;
  transform: none !important;
  box-shadow: none !important;
  padding: var(--spacing-xs) 0 var(--spacing-xs) var(--spacing-md) !important;
  opacity: 1 !important;
  visibility: visible !important;
  max-height: none !important;
  overflow: visible !important;
  min-width: auto !important;
  border-radius: 0 !important;
  background-color: var(--color-bg-light) !important;
}

/* Desktop Dropdown - 桌面端hover显示 */
@media (min-width: 992px) {
  .nav .dropdown-menu,
  .dropdown-menu {
    position: absolute !important;
    transform: translateX(-50%) !important;
    box-shadow: var(--shadow-lg) !important;
    padding: var(--spacing-sm) 0 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    max-height: 0 !important;
    overflow: hidden !important;
    min-width: 200px !important;
    border-radius: var(--radius-md) !important;
    background-color: var(--color-white) !important;
    transition: opacity 0.2s, visibility 0.2s !important;
  }

  .nav-item.dropdown:hover .dropdown-menu {
    opacity: 1 !important;
    visibility: visible !important;
    max-height: 500px !important;
    overflow: visible !important;
  }
}

/* Nav link with dropdown arrow */
.nav-item.dropdown .nav-link {
  justify-content: space-between;
}

.header-inner > .btn-accent.btn-sm,
.header-cta {
  display: none;
}

/* Hero Mobile */
.hero {
  min-height: auto;
  padding: var(--spacing-2xl) 0;
}

.hero.hero-command {
  margin-top: 74px;
  min-height: auto;
  padding: 34px 0 28px;
}

.hero-layout {
  grid-template-columns: 1fr;
  gap: 22px;
}

.hero-kicker {
  min-height: 30px;
  margin-bottom: 14px;
  padding: 6px 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
}

.hero-title {
  font-size: var(--font-size-2xl);
}

.hero-command .hero-title {
  font-size: 36px;
  line-height: 1.12;
  margin-bottom: 14px;
}

.hero-command .hero-title .highlight {
  font-size: 23px;
  line-height: 1.2;
  margin-top: 9px;
}

.hero-subtitle {
  font-size: var(--font-size-base);
}

.hero-command .hero-subtitle {
  font-size: 16px;
  line-height: 1.62;
  margin-bottom: 16px;
}

.hero-proof {
  gap: 8px;
  margin-bottom: 18px;
}

.hero-proof-item {
  min-height: 30px;
  padding: 6px 9px;
  font-size: 13px;
}

.hero-actions {
  flex-direction: column;
  width: 100%;
}

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

.hero-command .hero-actions .btn {
  min-height: 50px;
  padding: 0 18px;
  font-size: 16px;
}

.hero-visual {
  min-height: 220px;
  margin: 2px 0 0;
}

.hero-visual::before {
  inset: 24px 18px 0 12px;
}

.hero-visual-panel {
  min-height: 212px;
  padding: 10px;
}

.hero-visual-topbar {
  min-height: 28px;
  padding: 0 3px 8px;
  font-size: 10px;
}

.hero-visual-map {
  height: 128px;
}

.hero-telemetry {
  gap: 8px;
  margin-top: 8px;
}

.hero-telemetry div {
  padding: 10px;
}

.hero-telemetry span,
.hero-float-card span {
  font-size: 10px;
}

.hero-telemetry strong,
.hero-float-card strong {
  font-size: 15px;
}

.hero-float-card {
  min-width: 116px;
  padding: 8px;
}

.hero-float-card-a {
  left: 8px;
  bottom: 12px;
}

.hero-float-card-b {
  right: 8px;
  top: 42px;
}

.hero-command + .stats-bar {
  padding: 0 0 32px;
}

.hero-command + .stats-bar .stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: -10px;
}

.hero-command + .stats-bar .stat-item {
  min-height: 104px;
  padding: 18px 10px 14px;
}

.hero-command + .stats-bar .stat-value {
  font-size: 34px;
}

/* Section Mobile */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-sm {
  padding: var(--spacing-xl) 0;
}

.section-lg {
  padding: var(--spacing-3xl) 0;
}

/* Footer Mobile */
.footer-grid {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.footer-brand {
  max-width: none;
  text-align: center;
}

.footer-logo {
  justify-content: center;
}

.footer-social {
  justify-content: center;
}

.footer-bottom {
  flex-direction: column;
  text-align: center;
}

.footer-legal {
  justify-content: center;
}

/* Page Header Mobile */
.page-header {
  padding: var(--spacing-2xl) 0;
  margin-top: 74px;
}

.page-title {
  font-size: var(--font-size-2xl);
}

.breadcrumb {
  flex-wrap: wrap;
}

/* Page Layout Mobile */
.page-layout {
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg) 0;
}

.sidebar {
  position: static;
  order: -1;
}

.sidebar-menu {
  padding: var(--spacing-sm);
}

/* Grid System Mobile */
.row {
  margin: 0;
}

.col {
  flex: 0 0 100%;
  max-width: 100%;
  padding: 0;
}

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

/* Lead Magnet Section Mobile */
.section[id="contact"] > .container > div {
  grid-template-columns: 1fr !important;
  gap: 32px !important;
}

.section[id="contact"] .lead-form {
  padding: 24px !important;
}

.section[id="contact"] h2 {
  font-size: 24px !important;
}

.section[id="contact"] ul {
  margin-bottom: 24px;
}

.section[id="contact"] li {
  margin-bottom: 12px;
  font-size: 14px;
}

/* Typography Mobile */
h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }

/* ----------------------------------------
   Tablet Styles (576px - 991px)
   ---------------------------------------- */
@media (min-width: 576px) {
  .container {
    padding: 0 var(--spacing-lg);
  }

  .hero {
    min-height: 500px;
    padding: var(--spacing-3xl) 0;
  }

  .hero.hero-command {
    min-height: 650px;
    padding: 70px 0 56px;
  }

  .hero-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-command .hero-title {
    font-size: 50px;
  }

  .hero-command .hero-title .highlight {
    font-size: 31px;
  }

  .hero-visual {
    min-height: 360px;
  }

  .hero-visual-panel {
    min-height: 350px;
  }

  .hero-visual-map {
    height: 228px;
  }

  .hero-command + .stats-bar .stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: -18px;
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .row {
    margin: 0 calc(var(--spacing-md) * -1);
  }

  .col {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 0 var(--spacing-md);
  }

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

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: row;
  }

  .hero-actions .btn {
    width: auto;
  }
}

/* ----------------------------------------
   Desktop Styles (992px - 1199px)
   ---------------------------------------- */
@media (min-width: 992px) {
  .header-inner {
    height: 104px;
  }

  .logo-icon {
    width: 320px;
    height: 80px;
  }

  .nav {
    position: static;
    transform: none;
    background: none;
    padding: 0;
    display: flex;
    overflow: visible;
    visibility: visible !important;
    opacity: 1 !important;
  }

  .nav-list {
    flex-direction: row;
    gap: 12px;
    overflow: visible;
    scrollbar-width: auto;
    -ms-overflow-style: auto;
  }

  .nav-list::-webkit-scrollbar {
    display: none;
  }

  .nav-item {
    border: none;
  }

  .nav-link {
    display: inline-grid;
    grid-template-columns: auto auto;
    grid-template-rows: auto auto;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 60px;
    padding: 10px 12px;
    font-size: 19px;
    line-height: 1.08;
  }

  .nav-link::after {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .page-header {
    padding: var(--spacing-3xl) 0;
    margin-top: 104px;
  }

  .hero {
    min-height: 600px;
  }

  .hero.hero-command {
    min-height: 640px;
    margin-top: 104px;
    padding: 82px 0 64px;
  }

  .hero-layout {
    grid-template-columns: minmax(0, 0.95fr) minmax(420px, 0.85fr);
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .hero-command .hero-title {
    font-size: clamp(42px, 4.5vw, 62px);
  }

  .hero-command .hero-title .highlight {
    font-size: clamp(28px, 2.55vw, 38px);
  }

  .hero-visual {
    min-height: 430px;
  }

  .hero-visual-panel {
    min-height: 420px;
  }

  .hero-visual-map {
    height: 292px;
  }

  .hero-command + .stats-bar .stats-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    margin-top: -26px;
  }

  .section {
    padding: var(--spacing-3xl) 0;
  }

  .col {
    flex: 1;
    max-width: none;
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-layout {
    grid-template-columns: 260px 1fr;
    gap: var(--spacing-2xl);
  }

  .sidebar {
    position: sticky;
    top: 90px;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  /* Lead Magnet Section Desktop */
  .section[id="contact"] > .container > div {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
  h3 { font-size: var(--font-size-2xl); }
}

/* ----------------------------------------
   Large Desktop Styles (>= 1200px)
   ---------------------------------------- */
@media (min-width: 1200px) {
  .container {
    padding: 0 var(--spacing-xl);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .section-lg {
    padding: var(--spacing-4xl) 0;
  }
}

/* ----------------------------------------
   Print Styles
   ---------------------------------------- */
@media print {
  .header,
  .footer,
  .hero-actions,
  .sidebar,
  .menu-toggle {
    display: none !important;
  }

  .page-layout {
    display: block;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .page-header {
    background: none;
    color: #000;
    padding: 20pt 0;
    margin: 0;
  }
}

/* ----------------------------------------
   Reduced Motion
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ----------------------------------------
   Dark Mode Support
   ---------------------------------------- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-white: #1a1a1a;
    --color-bg-light: #2a2a2a;
    --color-bg-gray: #333333;
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #b0b0b0;
    --color-border: #404040;
    --color-border-dark: #505050;
    --color-secondary: #1a1a1a;
  }

  .header {
    background-color: var(--color-white);
  }

  .sidebar-menu,
  .sidebar-contact {
    background-color: var(--color-bg-gray);
  }

  .footer {
    background-color: #0d0d0d;
  }
}

/* ----------------------------------------
   High Contrast Mode
   ---------------------------------------- */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0044aa;
    --color-text-primary: #000000;
    --color-border: #000000;
  }

  body {
    border: 2px solid #000;
  }
}

/* ----------------------------------------
   Mobile Floating Bar (移动端悬浮栏)
   ---------------------------------------- */
.mobile-floating-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 56px;
  background-color: var(--color-white);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  z-index: 9999;
  justify-content: space-around;
  align-items: center;
  padding: 0 10px;
}

.float-bar-item {
  border: 0;
  background: transparent;
  font-family: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1 1 0;
  min-width: 0;
  height: 100%;
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 10px;
  gap: 2px;
}

.float-bar-item span {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.float-bar-item:active {
  color: var(--color-primary);
}

.float-bar-item svg {
  width: 20px;
  height: 20px;
}

/* 移动端显示悬浮栏 */
@media (max-width: 767px) {
  .mobile-floating-bar {
    display: grid !important;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    width: 100%;
    padding: 0 4px;
    justify-content: stretch;
    align-items: stretch;
  }

  .mobile-floating-bar .float-bar-item {
    width: auto;
    min-width: 0;
    padding: 4px 2px;
  }

  .floating-sidebar {
    display: none !important;
  }

  body {
    padding-bottom: 56px;
  }

  html,
  body {
    max-width: 100%;
    overflow-x: hidden;
  }

  .page-title,
  .article-title,
  .section-title,
  .section-title-main,
  .hero-title,
  .detail-title,
  .product-section-title,
  .solution-header h2,
  .card-title,
  .news-title,
  h1,
  h2,
  h3,
  p,
  li {
    max-width: 100%;
    overflow-wrap: anywhere;
    word-break: break-word;
    white-space: normal;
  }

  .page-header .container,
  .article-header .container,
  .section .container,
  .section-sm .container {
    min-width: 0;
  }

  .breadcrumb,
  .breadcrumb-item {
    max-width: 100%;
    min-width: 0;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .breadcrumb a,
  .breadcrumb span {
    white-space: normal;
  }

  .article-header .page-title {
    font-size: 28px !important;
    line-height: 1.25;
  }

  .solutions-detail h1,
  .solution-content h1,
  .case-content h1 {
    overflow-wrap: anywhere;
  }

  .btn {
    max-width: 100%;
    min-width: 0;
    white-space: normal;
    text-align: center;
  }

  .article-content [style*="justify-content: space-between"],
  .article-content [style*="grid-template-columns"],
  .tab-panel [style*="grid-template-columns"],
  .solution-header,
  .product-grid,
  .product-grid-reverse,
  .services-grid {
    grid-template-columns: 1fr !important;
    max-width: 100%;
    min-width: 0;
  }

  .article-content [style*="justify-content: space-between"] {
    flex-direction: column !important;
    align-items: stretch !important;
  }

  .article-content [style*="justify-content: space-between"] .btn {
    width: 100%;
    justify-content: center !important;
  }

  .card,
  .article-content,
  .product-content,
  .product-text-box,
  .tab-panel {
    max-width: 100%;
    min-width: 0;
  }

  .hero .scroll-indicator,
  .hero-scroll,
  .scroll-indicator {
    display: none !important;
  }

  .hero-actions {
    gap: 14px;
  }
}

/* Wechat Modal */
.wechat-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 10000;
  justify-content: center;
  align-items: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.wechat-modal-content {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 360px;
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.wechat-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-primary);
  color: var(--color-white);
}

.wechat-modal-header h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin: 0;
}

.wechat-modal-close {
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.wechat-modal-body {
  padding: var(--spacing-xl);
  text-align: center;
}

.wechat-tip {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.wechat-tip strong {
  color: var(--color-primary);
  font-size: var(--font-size-lg);
}

.wechat-modal-body .btn {
  width: 100%;
  margin-bottom: var(--spacing-sm);
}

.wechat-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.wechat-qrcode {
  margin-top: var(--spacing-md);
}

.wechat-qrcode img {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-md);
}

/* 平板适配 */
@media (min-width: 576px) and (max-width: 991px) {
  .mobile-floating-bar {
    height: 60px;
  }

  .float-bar-item {
    font-size: 11px;
  }

  .float-bar-item svg {
    width: 22px;
    height: 22px;
  }
}

/* Homepage polish mobile refinements */
@media (max-width: 575px) {
  #advantages .section-title-main,
  #process .section-title-main,
  #cases .section-title-main,
  #reviews .section-title-main,
  #faq .section-title-main,
  #news .section-title-main,
  #areas .section-title-main,
  #about .section-title-main {
    font-size: 23px !important;
    line-height: 1.28 !important;
    word-break: keep-all;
    overflow-wrap: normal;
  }

  #advantages .section-title-wrap,
  #process .section-title-wrap,
  #cases .section-title-wrap,
  #reviews .section-title-wrap,
  #faq .section-title-wrap,
  #news .section-title-wrap,
  #areas .section-title-wrap,
  #about .section-title-wrap {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
    text-align: left;
  }

  #advantages .section-title-sub,
  #process .section-title-sub,
  #cases .section-title-sub,
  #reviews .section-title-sub,
  #faq .section-title-sub,
  #news .section-title-sub,
  #areas .section-title-sub,
  #about .section-title-sub {
    font-size: 11px !important;
    padding: 5px 9px;
  }

  #advantages .advantage-title,
  #process .step-title,
  #cases .case-title,
  #news .news-title,
  #areas .areas-title {
    font-size: 20px !important;
    line-height: 1.35 !important;
  }

  #advantages .advantage-desc,
  #process .step-desc,
  #cases .case-desc,
  #reviews .review-text,
  #news .news-excerpt,
  #areas .areas-advantages li {
    font-size: 15px !important;
    line-height: 1.74 !important;
  }

  #about .section-title-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  #about .about-text p,
  .about-page-intro .about-text p {
    font-size: 15px !important;
    line-height: 1.76 !important;
  }

  .footer-logo-text {
    font-size: 22px !important;
    line-height: 1.32 !important;
  }

  .footer-desc,
  .footer-links a,
  .footer-contact-item,
  .footer-copyright {
    font-size: 15px !important;
    line-height: 1.72 !important;
  }
}