/* ===== 响应式设计 ===== */
@media (max-width: 1199px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }
  .footer__grid > div:first-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 991px) {
  :root {
    --spacing-section: 60px;
  }
  .hero__title {
    font-size: 24px;
    line-height: 34px;
  }
  .section__title {
    font-size: 20px;
  }
  .about-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .stats-section > div {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .section {
    padding: 50px 0;
  }

  .section__title {
    font-size: 18px;
  }

  .section__subtitle::before,
  .section__subtitle::after {
    display: none;
  }

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

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .cases-tabs {
    gap: 6px;
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }

  .cases-tabs::-webkit-scrollbar {
    display: none;
  }

  .cases-tab {
    padding: 6px 14px;
    font-size: 13px;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .navbar {
    height: var(--nav-height-mobile);
    background: var(--color-white);
  }

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

  .navbar.navbar--menu-open {
    background: var(--color-primary-dark);
  }

  .navbar.navbar--menu-open .navbar__logo {
    color: var(--color-white);
  }

  .navbar.navbar--menu-open .navbar__logo img {
    filter: none;
    opacity: 1;
  }

  .navbar.navbar--menu-open .navbar__hamburger span {
    background-color: var(--color-white);
  }

  .navbar__logo {
    color: var(--color-title);
  }

  .navbar__item {
    width: 100%;
    display: flex;
    flex-direction: column;
    overflow: visible;
  }

  .navbar__menu {
    display: none;
    position: fixed;
    top: var(--nav-height-mobile);
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, var(--color-primary-dark) 0%, var(--color-dark-bg) 100%);
    flex-direction: column;
    padding: 24px 20px;
    gap: 0;
    align-items: stretch;
    z-index: 999;
    overflow-y: auto;
  }

  .navbar__menu--open {
    display: flex;
  }

  .navbar__link {
    color: var(--color-white);
    font-size: 18px;
    font-weight: 500;
    padding: 16px 0;
    width: 100%;
    box-sizing: border-box;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 0;
    white-space: normal;
    overflow: visible;
    display: block;
  }

  .navbar__item--has-dropdown > .navbar__link {
    border-bottom: none;
    padding-bottom: 8px;
    position: relative;
    z-index: 1;
    padding-top: 16px;
  }

  .navbar__link:hover {
    background: transparent;
    color: rgba(255, 255, 255, 0.8);
  }

  .navbar__link::before {
    display: none;
  }

  .navbar__item--has-dropdown .navbar__link::after {
    display: none;
  }

  .navbar__dropdown,
  .navbar__item--has-dropdown:hover .navbar__dropdown {
    position: static !important;
    transform: none !important;
    box-shadow: none !important;
    border: none !important;
    background: rgba(255, 255, 255, 0.12) !important;
    border-radius: 12px !important;
    margin-top: 4px !important;
    margin-bottom: 12px !important;
    padding: 8px 0 !important;
    opacity: 1 !important;
    visibility: visible !important;
    width: 100% !important;
    left: auto !important;
    right: auto !important;
    top: auto !important;
  }

  .navbar__dropdown::before {
    display: none !important;
  }

  .navbar__dropdown-link {
    color: rgba(255, 255, 255, 0.92);
    padding: 12px 20px;
    font-size: 15px;
  }

  .navbar__dropdown-link:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--color-white);
  }

  .navbar__cta {
    display: flex;
    width: 100%;
    margin-top: var(--spacing-lg);
    margin-left: 0;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
  }

  .navbar__cta .btn--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    width: 100%;
    justify-content: center;
  }

  .navbar__hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: transparent;
  }

  .navbar__hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--color-title);
    transition: all var(--transition-base);
    border-radius: 1px;
  }

  .navbar__hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
    background-color: var(--color-white);
  }

  .navbar__hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .navbar__hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
    background-color: var(--color-white);
  }

  .hero {
    min-height: auto;
    padding: 120px 0 80px;
    text-align: center;
  }

  .hero--inner {
    min-height: auto;
    padding: 100px 0 60px;
  }

  .hero--inner .hero__title {
    font-size: 22px;
  }

  .hero__content {
    max-width: 100%;
    margin-left: 0;
    margin-right: auto;
    text-align: left;
  }

  .hero__orb {
    display: none;
  }

  .card {
    padding: var(--spacing-md);
  }

  .card:hover {
    transform: translateY(-4px);
  }

  .footer {
    padding: 40px 0 30px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .footer__contact-item {
    line-height: 1.6;
  }

  .footer__desc {
    max-width: 100%;
  }

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

  .process-flow {
    flex-direction: column;
  }

  .process-flow__item {
    width: 100%;
  }

  .process-flow__arrow {
    display: none;
  }

  .stats-card {
    padding: 16px 12px;
  }

  .stats-card__number {
    font-size: 24px;
  }

  .carousel__slide {
    flex: 0 0 calc(50% - 12px) !important;
  }

  .carousel__btn {
    width: 36px;
    height: 36px;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-section: 40px;
  }

  .hero__title {
    font-size: 20px;
    line-height: 30px;
  }

  .hero__desc {
    font-size: 14px;
    line-height: 24px;
  }

  .section__title {
    font-size: 16px;
  }

  .section__subtitle {
    font-size: 13px;
  }

  .card__title {
    font-size: 16px;
  }

  .card__desc {
    font-size: 13px;
  }

  .carousel__slide {
    flex: 0 0 100% !important;
  }
}

@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;
  }

  .scroll-reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}