:root {
      --theme: #0B3D91;
      --theme-dark: #071d45;
      --aurora: #7957d5;
      --ice: #9bdcff;
      --ink: #17243b;
      --muted: #66748b;
      --line: #e4eaf2;
      --surface: #ffffff;
      --soft: #f4f7fb;
      --radius: 18px;
      --shadow: 0 18px 50px rgba(11, 61, 145, .1);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: #f7f9fc;
      font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
      line-height: 1.7;
    }

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

    img {
      display: block;
      max-width: 100%;
    }

    button {
      font: inherit;
    }

    .container {
      width: min(1180px, calc(100% - 40px));
      margin: 0 auto;
    }

    .topbar {
      color: #dce8ff;
      background: #071d45;
      font-size: 13px;
    }

    .topbar .container,
    .topbar-links {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .topbar .container {
      min-height: 36px;
    }

    .topbar-links {
      justify-content: flex-end;
    }

    .topbar a {
      color: #dce8ff;
      transition: color .2s ease;
    }

    .topbar a:hover {
      color: var(--ice);
    }

    .header {
      position: relative;
      z-index: 20;
      background: rgba(255, 255, 255, .96);
      border-bottom: 1px solid var(--line);
    }

    .header-inner {
      display: flex;
      align-items: center;
      min-height: 78px;
      gap: 28px;
    }

    .logo {
      display: inline-flex;
      align-items: center;
      flex: 0 0 auto;
      gap: 10px;
      color: var(--theme-dark);
      font-size: 19px;
      font-weight: 800;
      white-space: nowrap;
    }

    .logo img {
      width: 38px;
      height: 38px;
      object-fit: contain;
    }

    .main-nav {
      flex: 1;
    }

    .nav-list {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .nav-item {
      position: relative;
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      min-height: 78px;
      padding: 0 14px;
      color: #33425d;
      font-size: 14px;
      font-weight: 700;
      white-space: nowrap;
    }

    .nav-link:hover,
    .nav-link:focus-visible {
      color: var(--theme);
    }

    .has-arrow::after {
      width: 6px;
      height: 6px;
      margin: -3px 0 0 8px;
      border-right: 1px solid currentColor;
      border-bottom: 1px solid currentColor;
      transform: rotate(45deg);
      content: "";
    }

    .dropdown-panel,
    .mega-menu {
      position: absolute;
      top: calc(100% - 1px);
      left: 50%;
      visibility: hidden;
      min-width: 250px;
      padding: 18px;
      opacity: 0;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 0 0 16px 16px;
      box-shadow: 0 18px 40px rgba(12, 35, 76, .14);
      transform: translate(-50%, 8px);
      transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
    }

    .dropdown-panel {
      display: grid;
      gap: 8px;
    }

    .dropdown-panel a {
      display: block;
      padding: 8px 10px;
      color: #42516a;
      font-size: 13px;
      border-radius: 8px;
    }

    .dropdown-panel a:hover {
      color: var(--theme);
      background: var(--soft);
    }

    .mega-menu {
      width: min(780px, 82vw);
      padding: 24px;
    }

    .nav-item:hover .dropdown-panel,
    .nav-item:focus-within .dropdown-panel,
    .nav-item:hover .mega-menu,
    .nav-item:focus-within .mega-menu {
      visibility: visible;
      opacity: 1;
      transform: translate(-50%, 0);
    }

    .mega-heading {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 16px;
    }

    .mega-heading strong {
      color: var(--theme-dark);
    }

    .mega-heading span {
      color: var(--muted);
      font-size: 12px;
    }

    .mega-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .mega-card {
      display: grid;
      gap: 4px;
      min-height: 112px;
      padding: 12px;
      background: var(--soft);
      border: 1px solid transparent;
      border-radius: 12px;
      transition: border-color .2s ease, transform .2s ease;
    }

    .mega-card:hover {
      border-color: #b9d5ff;
      transform: translateY(-2px);
    }

    .mega-card img {
      width: 30px;
      height: 30px;
      object-fit: contain;
      border-radius: 7px;
    }

    .mega-card strong {
      overflow: hidden;
      color: var(--ink);
      font-size: 13px;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .mega-card small {
      overflow: hidden;
      color: var(--muted);
      font-size: 11px;
      line-height: 1.5;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .mega-footer {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 18px;
      margin-top: 18px;
      padding-top: 14px;
      color: var(--theme);
      border-top: 1px solid var(--line);
      font-size: 12px;
      font-weight: 700;
    }

    .header-btns {
      display: flex;
      align-items: center;
      gap: 12px;
      flex: 0 0 auto;
    }

    .member-link,
    .account-link {
      font-size: 13px;
      font-weight: 700;
    }

    .member-link {
      color: var(--theme);
    }

    .account-link {
      padding: 9px 15px;
      color: #fff;
      background: var(--theme);
      border-radius: 9px;
    }

    .hamburger {
      display: none;
      width: 42px;
      height: 42px;
      padding: 9px;
      border: 1px solid var(--line);
      border-radius: 9px;
      background: #fff;
      cursor: pointer;
    }

    .hamburger span {
      display: block;
      width: 21px;
      height: 2px;
      margin: 4px auto;
      background: var(--theme-dark);
      transition: transform .2s ease, opacity .2s ease;
    }

    .hamburger.active span:nth-child(1) {
      transform: translateY(6px) rotate(45deg);
    }

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

    .hamburger.active span:nth-child(3) {
      transform: translateY(-6px) rotate(-45deg);
    }

    .drawer-overlay {
      position: fixed;
      z-index: 40;
      inset: 0;
      visibility: hidden;
      background: rgba(5, 18, 43, .5);
      opacity: 0;
      transition: opacity .25s ease, visibility .25s ease;
    }

    .drawer-overlay.open {
      visibility: visible;
      opacity: 1;
    }

    .mobile-drawer {
      position: fixed;
      z-index: 41;
      top: 0;
      right: 0;
      display: flex;
      flex-direction: column;
      width: min(360px, 88vw);
      height: 100vh;
      visibility: hidden;
      background: #fff;
      box-shadow: -10px 0 35px rgba(5, 18, 43, .18);
      transform: translateX(100%);
      transition: transform .25s ease, visibility .25s ease;
    }

    .mobile-drawer.open {
      visibility: visible;
      transform: translateX(0);
    }

    .drawer-head {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 22px 20px;
      color: #fff;
      background: var(--theme-dark);
    }

    .drawer-head strong {
      flex: 1;
    }

    .drawer-head a {
      color: var(--ice);
      font-size: 13px;
    }

    .drawer-close {
      padding: 0;
      color: #fff;
      background: none;
      border: 0;
      font-size: 28px;
      line-height: 1;
      cursor: pointer;
    }

    .drawer-menu {
      overflow-y: auto;
      padding: 12px 20px 30px;
    }

    .drawer-link,
    .drawer-toggle {
      display: block;
      width: 100%;
      padding: 14px 0;
      color: var(--ink);
      background: transparent;
      border: 0;
      border-bottom: 1px solid var(--line);
      text-align: left;
      font-weight: 700;
      cursor: pointer;
    }

    .drawer-toggle::after {
      float: right;
      margin-top: 5px;
      width: 7px;
      height: 7px;
      border-right: 1px solid currentColor;
      border-bottom: 1px solid currentColor;
      transform: rotate(45deg);
      content: "";
    }

    .drawer-toggle.active::after {
      transform: rotate(225deg);
    }

    .drawer-submenu {
      display: none;
      padding: 5px 0 8px 14px;
    }

    .drawer-submenu.open {
      display: block;
    }

    .drawer-submenu a {
      display: block;
      padding: 8px 0;
      color: var(--muted);
      font-size: 13px;
    }

    .about-page {
      padding-bottom: 90px;
    }

    .about-hero {
      position: relative;
      overflow: hidden;
      padding: 92px 0 105px;
      color: #fff;
      background:
        radial-gradient(circle at 18% 20%, rgba(121, 87, 213, .4), transparent 31%),
        radial-gradient(circle at 82% 5%, rgba(155, 220, 255, .22), transparent 28%),
        linear-gradient(135deg, #07152f 0%, #0B3D91 58%, #17104a 100%);
    }

    .about-hero::after {
      position: absolute;
      right: -8%;
      bottom: -55%;
      width: 72%;
      height: 100%;
      border: 1px solid rgba(155, 220, 255, .25);
      border-radius: 50%;
      transform: rotate(-12deg);
      content: "";
    }

    .about-hero .container {
      position: relative;
      z-index: 1;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      color: var(--ice);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: .12em;
    }

    .eyebrow::before {
      width: 28px;
      height: 2px;
      background: var(--ice);
      content: "";
    }

    .about-hero h1 {
      max-width: 760px;
      margin: 18px 0 16px;
      font-size: clamp(38px, 6vw, 72px);
      line-height: 1.12;
      letter-spacing: -.04em;
    }

    .about-hero p {
      max-width: 650px;
      margin: 0;
      color: #dce8ff;
      font-size: 17px;
    }

    .about-hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 30px;
    }

    .about-hero-meta span {
      padding: 8px 14px;
      color: #e9f5ff;
      background: rgba(255, 255, 255, .1);
      border: 1px solid rgba(155, 220, 255, .24);
      border-radius: 999px;
      font-size: 12px;
    }

    .about-section {
      padding: 82px 0 0;
    }

    .section-heading {
      max-width: 680px;
      margin-bottom: 34px;
    }

    .section-heading h2 {
      margin: 8px 0 12px;
      color: var(--theme-dark);
      font-size: clamp(28px, 4vw, 43px);
      line-height: 1.25;
    }

    .section-heading p {
      margin: 0;
      color: var(--muted);
    }

    .about-intro {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 28px;
      align-items: stretch;
    }

    .intro-card,
    .trust-card,
    .value-card,
    .timeline-card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .intro-card {
      padding: 34px;
    }

    .intro-card h3,
    .trust-card h3,
    .value-card h3,
    .timeline-card h3 {
      margin: 0 0 12px;
      color: var(--theme-dark);
      font-size: 21px;
    }

    .intro-card p {
      margin: 0 0 14px;
      color: var(--muted);
    }

    .trust-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 30px;
      color: #fff;
      background:
        linear-gradient(145deg, rgba(11, 61, 145, .95), rgba(23, 16, 74, .97)),
        var(--theme);
    }

    .trust-card h3 {
      color: #fff;
    }

    .trust-card p {
      margin: 0;
      color: #dce8ff;
    }

    .trust-number {
      margin-top: 30px;
      color: var(--ice);
      font-size: 46px;
      font-weight: 800;
      line-height: 1;
    }

    .trust-label {
      margin-top: 8px;
      color: #dce8ff;
      font-size: 13px;
    }

    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }

    .value-card {
      padding: 26px;
    }

    .value-index {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      margin-bottom: 22px;
      color: #fff;
      background: var(--theme);
      border-radius: 12px;
      font-size: 13px;
      font-weight: 800;
    }

    .value-card p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .timeline {
      display: grid;
      gap: 0;
      padding: 8px 0;
    }

    .timeline-card {
      position: relative;
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 25px;
      padding: 25px 30px;
      border-radius: 0;
      box-shadow: none;
    }

    .timeline-card:first-child {
      border-radius: var(--radius) var(--radius) 0 0;
    }

    .timeline-card:last-child {
      border-radius: 0 0 var(--radius) var(--radius);
    }

    .timeline-card + .timeline-card {
      border-top: 0;
    }

    .timeline-year {
      color: var(--theme);
      font-size: 16px;
      font-weight: 800;
    }

    .timeline-card p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .about-cta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 25px;
      margin-top: 70px;
      padding: 32px 36px;
      color: #fff;
      background: var(--theme-dark);
      border-radius: var(--radius);
    }

    .about-cta h2 {
      margin: 0 0 5px;
      font-size: 25px;
    }

    .about-cta p {
      margin: 0;
      color: #c8d8f2;
      font-size: 14px;
    }

    .cta-button {
      flex: 0 0 auto;
      padding: 12px 20px;
      color: var(--theme-dark);
      background: var(--ice);
      border-radius: 9px;
      font-size: 14px;
      font-weight: 800;
    }

    .footer {
      padding: 60px 0 20px;
      color: #c4d2e8;
      background: #07152f;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1fr;
      gap: 42px;
    }

    .footer-brand strong,
    .footer h3 {
      color: #fff;
    }

    .footer-brand strong {
      font-size: 20px;
    }

    .footer p {
      max-width: 360px;
      margin: 14px 0 0;
      font-size: 13px;
    }

    .footer h3 {
      margin: 0 0 15px;
      font-size: 14px;
    }

    .footer-grid > div:not(.footer-brand) {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .footer-grid a,
    .footer-grid span {
      color: #c4d2e8;
      font-size: 13px;
    }

    .footer-grid a:hover {
      color: var(--ice);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      margin-top: 45px;
      padding-top: 18px;
      color: #8ea5c7;
      border-top: 1px solid rgba(196, 210, 232, .15);
      font-size: 12px;
    }

    @media (max-width: 980px) {
      .main-nav {
        display: none;
      }

      .hamburger {
        display: block;
      }

      .header-btns {
        margin-left: auto;
      }

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

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

    @media (max-width: 640px) {
      .container {
        width: min(100% - 28px, 1180px);
      }

      .topbar .container {
        align-items: flex-start;
        flex-direction: column;
        gap: 0;
        padding: 8px 0;
      }

      .topbar-links {
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: 4px 14px;
      }

      .member-link {
        display: none;
      }

      .about-hero {
        padding: 68px 0 78px;
      }

      .about-hero p {
        font-size: 15px;
      }

      .about-section {
        padding-top: 58px;
      }

      .intro-card,
      .trust-card {
        padding: 25px;
      }

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

      .timeline-card {
        grid-template-columns: 1fr;
        gap: 5px;
        padding: 22px;
      }

      .about-cta {
        align-items: flex-start;
        flex-direction: column;
        padding: 25px;
      }

      .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
        margin-top: 32px;
      }
    }