/* ============================================
   响应式样式
   ============================================ */

/* 大屏 1280-1440 */
@media (max-width: 1440px) {
  :root {
    --container-max: 1200px;
  }
}

/* 桌面 1200 */
@media (max-width: 1200px) {
  .footer-link-grid {
    grid-template-columns: repeat(6, 1fr);
  }

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

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

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

/* 平板 992 */
@media (max-width: 992px) {
  :root {
    --container-pad: 20px;
  }

  .nav-menu {
    position: fixed;
    top: 64px;
    right: 0;
    width: 100%;
    max-width: 320px;
    height: calc(100vh - 64px);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    background: rgba(6, 21, 41, 0.98);
    backdrop-filter: blur(20px);
    transform: translateX(100%);
    transition: transform 0.4s var(--ease-out);
    overflow-y: auto;
    border-left: 1px solid rgba(200, 162, 110, 0.2);
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-menu a {
    padding: 12px 16px;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 0;
  }

  .nav-menu a.nav-cta {
    margin: 12px 0 0;
    text-align: center;
    border-radius: var(--radius-md);
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: clamp(1.8rem, 5vw, 2.6rem);
  }

  .hero-trust {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .services-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .service-card {
    grid-column: span 3;
  }

  .service-card-lg {
    grid-column: span 6;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .service-card-lg .service-icon {
    grid-row: auto;
  }

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

  .matrix-card-featured {
    transform: translateY(0);
  }

  .matrix-card-featured:hover {
    transform: translateY(-6px);
  }

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

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

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

  .faq-list {
    grid-template-columns: 1fr;
  }

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

  .about-visual {
    position: static;
  }

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

  .footer-main {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

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

/* 平板 768 */
@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .section-head {
    margin-bottom: 40px;
  }

  .hero-content {
    min-height: auto;
    padding: 90px 0 60px;
  }

  .hero-eyebrow {
    font-size: 12px;
  }

  .hero-actions {
    margin-bottom: 40px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .scroll-hint {
    display: none;
  }

  .service-card {
    grid-column: span 6;
    padding: 24px 20px;
  }

  .service-card-lg {
    grid-column: span 6;
    padding: 28px 24px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 50px;
  }

  .stat-item {
    padding: 20px 8px;
  }

  .stat-num {
    font-size: 32px;
  }

  .stat-suffix {
    font-size: 14px;
  }

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

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

  .footer-main {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }

  .about-values {
    grid-template-columns: 1fr;
  }

  .strength-features {
    grid-template-columns: 1fr;
  }

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

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

  .logo {
    font-size: 16px;
  }

  .logo-tag {
    font-size: 12px;
    letter-spacing: 1px;
  }
}

/* 手机 480 */
@media (max-width: 480px) {
  :root {
    --container-pad: 16px;
  }

  .navbar {
    padding: 12px 0;
  }

  .navbar.scrolled {
    padding: 10px 0;
  }

  .logo-tag {
    display: none;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 14px;
  }

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

  .btn {
    width: 100%;
  }

  .hero-trust {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .trust-num {
    font-size: 24px;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .stat-num {
    font-size: 28px;
  }

  .process-list {
    grid-template-columns: 1fr;
  }

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

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}