:root {
      --blue-deep: #0b3fa0;
      --blue-main: #1e6ff5;
      --blue-bright: #3f8dff;
      --blue-sky: #e8f2ff;
      --blue-ice: #f2f7ff;
      --color-accent: #1e6ff5;
      --color-bg: #f2f7ff;
      --color-white: #ffffff;
      --color-text: #12325e;
      --color-text-light: #4b6a99;
      --color-border: #c9ddf7;

      --font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
      --container-width: 1200px;
      --header-height: 80px;

      --radius: 14px;
      --gradient-main: linear-gradient(120deg, #1e6ff5 0%, #35c5ff 100%);
      --gradient-deep: linear-gradient(135deg, #0b3fa0 0%, #1e6ff5 60%, #35c5ff 100%);
      --gradient-band: linear-gradient(135deg, #1e6ff5 0%, #35a5ff 50%, #35c5ff 100%);
      --shadow-soft: 0 8px 24px rgba(30, 111, 245, 0.12);
      --shadow-hover: 0 12px 32px rgba(30, 111, 245, 0.22);
      --transition: 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    ul {
      list-style: none;
    }

    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ===== 顶部导航 - 蓝色渐变 ===== */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      height: var(--header-height);
      background: var(--gradient-deep);
      box-shadow: 0 4px 18px rgba(11, 63, 160, 0.35);
      display: flex;
      align-items: center;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 600;
      letter-spacing: 0.5px;
      color: var(--color-white);
    }

    .logo i {
      color: #aee0ff;
      margin-right: 6px;
    }

    .nav-menu {
      display: flex;
      gap: 1.2rem;
      font-weight: 500;
    }

    .nav-menu a {
      padding: 0.45rem 1.1rem;
      border-radius: 999px;
      color: rgba(255, 255, 255, 0.92);
      border: 1px solid rgba(255, 255, 255, 0);
      transition: all var(--transition);
      font-size: 1rem;
    }

    .nav-menu a:hover {
      background: rgba(255, 255, 255, 0.18);
      border-color: rgba(255, 255, 255, 0.55);
      color: #ffffff;
    }

    /* ===== Banner 轮播 - 横向全屏 ===== */
    .banner-section {
      color: var(--color-white);
      padding: 0;
      position: relative;
      width: 100%;
    }

    .banner-carousel {
      position: relative;
      width: 100%;
      height: var(--banner-height);
      overflow: hidden;
      border-radius: 0;
    }

    .carousel-track {
      display: flex;
      height: 100%;
      width: 100%;
      transition: transform 0.6s cubic-bezier(0.25, 0.1, 0.25, 1);
    }

    .carousel-slide {
      flex: 0 0 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .carousel-slide::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(11, 63, 160, 0.18) 0%, rgba(30, 111, 245, 0.22) 100%);
      backdrop-filter: blur(1px);
      z-index: 1;
    }

    .carousel-slide img {
      display: block;
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .slide-content {
      position: relative;
      z-index: 2;
      max-width: 620px;
      text-align: center;
      padding: 2.2rem 2.8rem;
      border-radius: var(--radius);
      border-top: 5px solid #35c5ff;
      background: rgba(11, 63, 160, 0.5);
      backdrop-filter: blur(4px);
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
    }

    .slide-content h2 {
      font-size: 2.5rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      letter-spacing: 1px;
      text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    }

    .slide-content p {
      font-size: 1.15rem;
      opacity: 0.95;
      margin-bottom: 0.25rem;
      text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    }

    .carousel-btn {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      background: rgba(255, 255, 255, 0.20);
      color: white;
      font-size: 1.8rem;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      cursor: pointer;
      transition: background var(--transition), transform 0.15s;
      backdrop-filter: blur(4px);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 10;
      border: 1px solid rgba(255, 255, 255, 0.35);
    }

    .carousel-btn:hover {
      background: var(--gradient-main);
      border-color: transparent;
      transform: translateY(-50%) scale(1.05);
    }

    .carousel-btn.prev {
      left: 20px;
    }

    .carousel-btn.next {
      right: 20px;
    }

    .carousel-indicators {
      position: absolute;
      bottom: 18px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 10px;
      z-index: 10;
    }

    .carousel-indicators span {
      width: 12px;
      height: 12px;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.35);
      cursor: pointer;
      transition: background var(--transition), width 0.3s;
      border: 1px solid rgba(255, 255, 255, 0.4);
    }

    .carousel-indicators span.active {
      background: #35c5ff;
      width: 28px;
      border-color: #ffffff;
    }

    /* ===== 通用分区 - 标题居中 ===== */
    section {
      padding: 70px 0;
      border-bottom: none;
    }

    .section-title {
      font-size: 1.9rem;
      font-weight: 700;
      margin-bottom: 2.2rem;
      position: relative;
      display: block;
      text-align: center;
      color: var(--blue-deep);
    }

    .section-title::after {
      content: '';
      display: block;
      width: 64px;
      height: 5px;
      background: var(--gradient-main);
      margin: 10px auto 0;
      border-radius: 4px;
    }

    /* ===== 物流查询 - 窄列居中 + 深蓝渐变查询卡 ===== */
    .track-section {
      background:
        radial-gradient(circle at 10% 0%, rgba(53, 197, 255, 0.14) 0%, transparent 40%),
        radial-gradient(circle at 90% 100%, rgba(30, 111, 245, 0.12) 0%, transparent 42%),
        var(--color-white);
    }

    .track-section .container {
      max-width: 820px;
    }

    .track-box {
      background: var(--gradient-deep);
      padding: 36px 36px;
      border-radius: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      box-shadow: var(--shadow-hover);
      margin-bottom: 36px;
      border: none;
    }

    .track-box input {
      flex: 3 1 240px;
      padding: 15px 20px;
      border: none;
      border-radius: 999px;
      font-size: 1rem;
      background: rgba(255, 255, 255, 0.96);
      color: var(--color-text);
      transition: all var(--transition);
    }

    .track-box input::placeholder {
      color: #8aa3c4;
    }

    .track-box input:focus {
      outline: none;
      background: var(--color-white);
      box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.65);
    }

    .track-box button {
      flex: 0 0 auto;
      background: var(--color-white);
      color: var(--blue-deep);
      border: none;
      padding: 15px 36px;
      border-radius: 999px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(0, 20, 60, 0.25);
      transition: all var(--transition), transform 0.1s;
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }

    .track-box button:hover {
      background: #ffd166;
      color: #0b3fa0;
      transform: translateY(-2px);
    }

    .track-box button:active {
      transform: scale(0.97);
    }

    .track-result {
      background: var(--color-white);
      border-radius: var(--radius);
      padding: 24px 28px 30px;
      border: 1px solid var(--color-border);
      margin-top: 12px;
      display: none;
      box-shadow: var(--shadow-soft);
    }

    .track-result.active {
      display: block;
      animation: fadeUp 0.35s ease;
    }

    @keyframes fadeUp {
      from {
        opacity: 0;
        transform: translateY(8px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .track-result .status-badge {
      display: inline-block;
      background: var(--gradient-main);
      color: white;
      padding: 4px 18px;
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 18px;
    }

    .timeline {
      position: relative;
      padding-left: 28px;
      border-left: 3px solid var(--blue-main);
    }

    .timeline-item {
      margin-bottom: 22px;
      position: relative;
    }

    .timeline-item::before {
      content: '';
      position: absolute;
      left: -38px;
      top: 0px;
      width: 14px;
      height: 14px;
      background: var(--gradient-main);
      border-radius: 50%;
      border: 2px solid var(--color-white);
      box-shadow: 0 0 0 2px var(--blue-bright);
    }

    .timeline-item .time {
      font-size: 0.85rem;
      color: var(--color-text-light);
      font-weight: 600;
    }

    .timeline-item .desc {
      font-size: 1rem;
      margin-top: 2px;
      background: var(--blue-ice);
      display: inline-block;
      padding: 4px 14px;
      border-radius: 8px;
      border: 1px solid var(--color-border);
    }

    /* ===== 关于我们 - 分栏一体大卡片 ===== */
    .about-section {
      background: linear-gradient(180deg, var(--blue-sky) 0%, var(--color-white) 100%);
    }

    .about-grid {
      display: flex;
      flex-wrap: wrap;
      align-items: stretch;
      background: var(--color-white);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--color-border);
    }

    .about-image {
      order: -1;
      flex: 1 1 280px;
      min-height: 340px;
      height: auto;
      background: var(--gradient-deep);
      border-radius: 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 14px;
      color: var(--color-white);
      font-size: 2.4rem;
      letter-spacing: 3px;
      box-shadow: none;
    }

    .about-image i {
      opacity: 0.95;
      font-size: 4.2rem;
    }

    .about-text {
      flex: 1.6 1 320px;
      padding: 48px 52px;
      display: flex;
      align-items: center;
    }

    .about-text p {
      margin-bottom: 1.2rem;
      font-size: 1.05rem;
      color: var(--color-text-light);
    }

    .about-text p:last-child {
      margin-bottom: 0;
    }

    .about-text strong {
      color: var(--blue-deep);
    }

    /* ===== 联系我们 - 亮蓝通栏色带 + 2×2 玻璃卡片 ===== */
    .contact-section {
      background: var(--gradient-band);
      color: var(--color-white);
    }

    .contact-section .section-title {
      color: var(--color-white);
    }

    .contact-section .section-title i {
      color: #ffd166 !important;
    }

    .contact-section .section-title::after {
      background: #ffffff;
      opacity: 0.85;
    }

    .contact-wrapper {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 18px;
      font-size: 1.05rem;
      padding: 22px 26px;
      border-radius: 16px;
      border: 1px solid rgba(255, 255, 255, 0.35);
      background: rgba(255, 255, 255, 0.14);
      backdrop-filter: blur(6px);
      color: var(--color-white);
      transition: all var(--transition);
    }

    .contact-item:hover {
      background: rgba(255, 255, 255, 0.26);
      transform: translateY(-4px);
      box-shadow: 0 10px 26px rgba(0, 40, 100, 0.25);
    }

    .contact-item i {
      width: 46px;
      height: 46px;
      background: rgba(255, 255, 255, 0.22);
      color: #ffffff;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      flex: 0 0 auto;
    }

    .contact-item a {
      color: #ffffff;
      font-weight: 700;
      text-decoration: underline;
      text-underline-offset: 3px;
      text-decoration-color: rgba(255, 255, 255, 0.5);
      transition: all var(--transition);
    }

    .contact-item a:hover {
      text-decoration-color: #ffd166;
      color: #fff8e6;
    }

    .contact-detail {
      margin-top: 8px;
      color: rgba(255, 255, 255, 0.85);
      font-size: 0.8rem;
      text-transform: uppercase;
      letter-spacing: 1.5px;
    }

    /* ===== 页脚 ===== */
    .footer {
      background: linear-gradient(135deg, #082b6b 0%, #0b3fa0 100%);
      color: rgba(255, 255, 255, 0.85);
      padding: 30px 0;
      text-align: center;
      font-size: 0.95rem;
    }

    .footer i {
      color: #aee0ff;
      margin: 0 4px;
    }

    /* ===== 响应式 ===== */
    @media (max-width: 768px) {
      :root {
        --header-height: auto;
      }

      /* 导航栏：Logo 与菜单上下堆叠 */
      .navbar {
        padding: 10px 0;
      }

      .navbar .container {
        flex-direction: column;
        gap: 10px;
      }

      .logo img {
        width: 56px !important;
      }

      .nav-menu {
        display: flex;
        gap: 0.5rem;
        font-size: 0.9rem;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start;
        padding-bottom: 4px;
        scrollbar-width: none;
      }

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

      .nav-menu li {
        flex: 0 0 auto;
      }

      .nav-menu a {
        padding: 0.35rem 0.9rem;
        white-space: nowrap;
      }

      /* 轮播 */
      .slide-content h2 {
        font-size: 1.8rem;
      }

      .slide-content {
        padding: 1.4rem 1.2rem;
        margin: 0 12px;
      }

      .slide-content p {
        font-size: 1rem;
      }

      .carousel-btn {
        width: 38px;
        height: 38px;
        font-size: 1.2rem;
      }

      .carousel-btn.prev {
        left: 10px;
      }

      .carousel-btn.next {
        right: 10px;
      }

      /* 通用区块 */
      section {
        padding: 40px 0;
      }

      .section-title {
        font-size: 1.5rem;
        margin-bottom: 1.2rem;
      }

      /* 物流查询 */
      .track-section .container {
        padding: 0 16px;
      }

      .track-box {
        flex-direction: column;
        align-items: stretch;
        padding: 20px 18px;
        gap: 12px;
        border-radius: 18px;
      }

      .track-box input {
        width: 100%;
        padding: 13px 16px;
        font-size: 16px; /* 防止 iOS 聚焦自动放大 */
      }

      .track-box button {
        width: 100%;
        justify-content: center;
        padding: 13px 20px;
      }

      .track-result {
        padding: 16px 16px 20px;
      }

      /* 关于我们：卡片内部纵向堆叠 */
      .about-text {
        padding: 28px 24px;
      }

      .about-image {
        min-height: 190px;
        font-size: 1.8rem;
        gap: 8px;
      }

      .about-image i {
        font-size: 3rem;
      }

      /* 联系我们：单列网格 */
      .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 14px;
      }

      .contact-item {
        padding: 14px 16px;
        font-size: 1rem;
      }

      .contact-item i {
        width: 40px;
        height: 40px;
        border-radius: 10px;
      }

      /* 页脚 */
      .footer {
        padding: 20px 0;
        font-size: 0.85rem;
      }
    }

    /* 小屏手机 */
    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }

      .logo img {
        width: 48px !important;
      }

      .nav-menu {
        font-size: 0.85rem;
      }

      .slide-content h2 {
        font-size: 1.4rem;
      }

      .slide-content p {
        font-size: 0.9rem;
      }

      .section-title {
        font-size: 1.3rem;
      }

      .section-title::after {
        width: 52px;
        height: 4px;
      }

      .timeline-item .desc {
        font-size: 0.92rem;
        padding: 4px 10px;
      }

      .carousel-indicators span {
        width: 10px;
        height: 10px;
      }

      .carousel-indicators span.active {
        width: 22px;
      }

      .about-image {
        min-height: 160px;
        font-size: 1.4rem;
      }

      .about-image i {
        font-size: 2.4rem;
      }

      .about-text {
        padding: 22px 18px;
      }
    }