/* ===================================================
   JP Brothers — responsive.css
   手机端 / 平板端响应式
   =================================================== */

/* ---------- 平板 ≤ 1024px ---------- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about-image { order: -1; max-height: 320px; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }

  .portfolio-card { flex: 0 0 calc(25% - 15px); }
}

/* ---------- 手机 ≤ 768px ---------- */
@media (max-width: 768px) {
  :root { --nav-h: 60px; }

  /* Nav */
  .nav-menu {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: rgba(10,10,10,.97);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    transition: transform .3s ease, opacity .3s ease;
    z-index: 999;
  }
  .nav-menu.open { transform: translateY(0); opacity: 1; }
  .nav-link { padding: 12px 16px; font-size: 1rem; border-radius: var(--radius-sm); }
  .nav-toggle { display: flex; }
  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  /* Sections */
  .section { padding: 70px 0; }
  .section-header { margin-bottom: 40px; }

  /* Hero */
  .hero-logo { width: 200px; height: auto; }

  /* Services */
  .services-grid {
    grid-template-columns: 1fr;
    border-radius: var(--radius-md);
  }
  .service-card { aspect-ratio: 16/7; }
  .service-detail { max-height: 200px !important; }

  /* Portfolio — 手机端横向轮播 */
  .portfolio-track-wrap { overflow: hidden; cursor: grab; }
  .portfolio-track {
    flex-wrap: nowrap;
    justify-content: flex-start;
    /* transition 由 JS 控制 */
  }
  .portfolio-card { flex: 0 0 52vw; min-width: 160px; }

  /* 手机端显示圆点 */
  .portfolio-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
  }
  .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: rgba(0,0,0,.2);
    transition: background .2s;
    cursor: pointer;
  }
  .dot.active { background: var(--primary); }

  /* Team */
  .team-grid { grid-template-columns: 1fr; }

  /* About Stats */
  .about-stats { gap: 24px; flex-wrap: wrap; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; }
  .btn-submit { align-self: stretch; text-align: center; }

  /* Back Top */
  .back-top { right: 16px; bottom: 16px; }
}

/* ---------- 小手机 ≤ 480px ---------- */
@media (max-width: 480px) {
  .portfolio-card { flex: 0 0 72vw; }
  .nav-logo-text { display: none; }
}