:root {
      --theme: #0B3D91;
      --theme-dark: #06265e;
      --theme-light: #e8f0ff;
      --ink: #142033;
      --muted: #617087;
      --line: #dce3ed;
      --surface: #f5f7fa;
      --white: #fff;
      --success: #087f5b;
      --warning: #b56500;
      --shadow: 0 16px 36px rgba(20, 32, 51, .1);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

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

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

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

    button,
    input {
      font: inherit;
    }

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

    .topbar {
      color: #dce8ff;
      background: #071a38;
      font-size: 13px;
    }

    .topbar .container {
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .topbar a {
      margin-left: 20px;
      color: #dce8ff;
    }

    .topbar a:hover {
      color: #fff;
    }

    .header {
      position: relative;
      z-index: 50;
      background: rgba(255, 255, 255, .98);
      border-bottom: 1px solid var(--line);
    }

    .header-inner {
      min-height: 76px;
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .logo {
      min-width: 170px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--theme-dark);
      font-size: 18px;
      font-weight: 800;
    }

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

    .main-nav {
      flex: 1;
      align-self: stretch;
    }

    .nav-list {
      height: 100%;
      margin: 0;
      padding: 0;
      display: flex;
      align-items: stretch;
      justify-content: center;
      list-style: none;
    }

    .nav-item {
      position: relative;
      display: flex;
      align-items: stretch;
    }

    .nav-link {
      padding: 0 14px;
      display: flex;
      align-items: center;
      color: #27364b;
      font-size: 15px;
      font-weight: 600;
      white-space: nowrap;
      border-bottom: 3px solid transparent;
    }

    .nav-link:hover,
    .nav-item:focus-within > .nav-link {
      color: var(--theme);
      border-bottom-color: var(--theme);
    }

    .has-arrow::after {
      content: "";
      width: 6px;
      height: 6px;
      margin: -4px 0 0 8px;
      border-right: 1.5px solid currentColor;
      border-bottom: 1.5px solid currentColor;
      transform: rotate(45deg);
    }

    .dropdown-panel,
    .mega-menu {
      position: absolute;
      top: 100%;
      left: 0;
      z-index: 60;
      visibility: hidden;
      opacity: 0;
      transform: translateY(8px);
      background: var(--white);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      transition: opacity .18s ease, transform .18s ease, visibility .18s;
    }

    .dropdown-panel::before,
    .mega-menu::before {
      content: "";
      position: absolute;
      right: 0;
      bottom: 100%;
      left: 0;
      height: 8px;
    }

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

    .dropdown-panel {
      width: 320px;
      padding: 12px;
      border-radius: 0 0 6px 6px;
    }

    .dropdown-panel > a:not(.mega-footer) {
      padding: 10px 12px;
      display: block;
      overflow: hidden;
      color: #34435a;
      text-overflow: ellipsis;
      white-space: nowrap;
      border-radius: 4px;
    }

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

    .mega-menu {
      left: 50%;
      width: min(760px, 80vw);
      border-radius: 0 0 6px 6px;
      transform: translate(-50%, 8px);
    }

    .nav-item:hover > .mega-menu,
    .nav-item:focus-within > .mega-menu {
      transform: translate(-50%, 0);
    }

    .mega-grid {
      padding: 22px;
      display: grid;
      grid-template-columns: 190px 1fr;
      gap: 24px;
    }

    .mega-grid h4 {
      margin: 0 0 8px;
      color: var(--theme-dark);
      font-size: 16px;
    }

    .mega-grid p,
    .mega-grid small {
      color: var(--muted);
    }

    .mega-grid > div:first-child > a {
      margin: 7px 0;
      display: block;
      color: var(--theme);
      font-size: 14px;
      font-weight: 700;
    }

    .mega-cards {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 8px;
    }

    .mega-card {
      min-width: 0;
      min-height: 68px;
      padding: 10px;
      display: grid;
      grid-template-columns: auto 1fr;
      align-content: center;
      column-gap: 9px;
      background: var(--surface);
      border: 1px solid transparent;
      border-radius: 5px;
    }

    .mega-card:hover {
      background: var(--white);
      border-color: #b8cae8;
    }

    .mega-card img {
      width: 30px;
      height: 30px;
      grid-row: 1 / 3;
      align-self: center;
      object-fit: contain;
    }

    .mega-card b,
    .mega-card small {
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .mega-card b {
      font-size: 14px;
    }

    .mega-card small {
      font-size: 12px;
    }

    .mega-footer {
      padding: 11px 20px;
      display: block;
      color: var(--theme);
      background: #f0f4fa;
      font-size: 13px;
      font-weight: 700;
      text-align: right;
      border-top: 1px solid var(--line);
    }

    .header-btns {
      display: flex;
      align-items: center;
      gap: 9px;
      white-space: nowrap;
    }

    .member-btn {
      color: var(--theme);
      font-size: 14px;
      font-weight: 700;
    }

    .open-btn {
      padding: 8px 15px;
      color: var(--white);
      background: var(--theme);
      border-radius: 4px;
      font-size: 14px;
      font-weight: 700;
    }

    .open-btn:hover {
      background: var(--theme-dark);
    }

    .hamburger {
      width: 42px;
      height: 42px;
      padding: 10px;
      display: none;
      flex-direction: column;
      align-items: stretch;
      justify-content: center;
      gap: 5px;
      background: transparent;
      border: 1px solid var(--line);
      border-radius: 4px;
      cursor: pointer;
    }

    .hamburger span {
      height: 2px;
      background: var(--ink);
      transition: transform .2s ease, opacity .2s ease;
    }

    .hamburger.active span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

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

    .hamburger.active span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    .drawer-overlay {
      position: fixed;
      inset: 0;
      z-index: 90;
      visibility: hidden;
      opacity: 0;
      background: rgba(4, 13, 28, .56);
      transition: opacity .25s ease, visibility .25s;
    }

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

    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      z-index: 100;
      width: min(390px, 88vw);
      height: 100vh;
      overflow-y: auto;
      background: var(--white);
      box-shadow: -20px 0 50px rgba(6, 19, 40, .18);
      transform: translateX(105%);
      transition: transform .25s ease;
    }

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

    .drawer-head {
      min-height: 70px;
      padding: 12px 18px;
      display: flex;
      align-items: center;
      gap: 14px;
      color: var(--white);
      background: var(--theme-dark);
    }

    .drawer-head > a {
      padding: 7px 12px;
      background: var(--theme);
      border-radius: 4px;
      font-weight: 700;
    }

    .drawer-close {
      width: 38px;
      height: 38px;
      margin-left: auto;
      color: var(--white);
      background: transparent;
      border: 0;
      font-size: 28px;
      cursor: pointer;
    }

    .drawer-menu {
      padding: 12px 18px 30px;
    }

    .drawer-link,
    .drawer-toggle {
      width: 100%;
      padding: 14px 4px;
      display: block;
      color: var(--ink);
      background: transparent;
      border: 0;
      border-bottom: 1px solid var(--line);
      font-weight: 700;
      text-align: left;
      cursor: pointer;
    }

    .drawer-toggle {
      position: relative;
    }

    .drawer-toggle::after {
      content: "+";
      position: absolute;
      right: 5px;
    }

    .drawer-toggle.active::after {
      content: "−";
    }

    .drawer-submenu {
      max-height: 0;
      overflow: hidden;
      background: var(--surface);
      transition: max-height .3s ease;
    }

    .drawer-submenu.open {
      max-height: 640px;
    }

    .drawer-submenu a {
      padding: 10px 14px;
      display: block;
      color: #43516a;
      border-bottom: 1px solid #e5eaf1;
      font-size: 14px;
    }

    .about-page {
      overflow: hidden;
    }

    .about-page .about-hero {
      position: relative;
      min-height: 520px;
      padding: 94px 0 88px;
      color: var(--white);
      background:
        linear-gradient(rgba(5, 22, 53, .82), rgba(6, 38, 94, .93)),
        radial-gradient(circle at 20% 20%, #2f72cf 0, transparent 35%),
        #071b3c;
    }

    .about-page .about-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      opacity: .34;
      background-image:
        linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
      background-size: 54px 54px;
    }

    .about-page .hero-inner {
      position: relative;
      z-index: 1;
      max-width: 900px;
    }

    .about-page .eyebrow {
      margin-bottom: 15px;
      display: inline-flex;
      align-items: center;
      gap: 9px;
      color: #bcd4ff;
      font-size: 14px;
      font-weight: 700;
    }

    .about-page .eyebrow::before {
      content: "";
      width: 34px;
      height: 2px;
      background: #70a7ff;
    }

    .about-page h1 {
      max-width: 820px;
      margin: 0;
      font-size: clamp(38px, 6vw, 72px);
      line-height: 1.12;
      letter-spacing: 0;
    }

    .about-page .hero-copy {
      max-width: 700px;
      margin: 24px 0 0;
      color: #dce8fa;
      font-size: 18px;
    }

    .about-page .hero-links {
      margin-top: 32px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .about-page .hero-links a {
      min-height: 44px;
      padding: 10px 18px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255,255,255,.4);
      border-radius: 4px;
      font-weight: 700;
    }

    .about-page .hero-links a:first-child {
      color: var(--theme-dark);
      background: var(--white);
      border-color: var(--white);
    }

    .about-page .principles {
      padding: 76px 0;
      background: var(--white);
    }

    .about-page .section-head {
      max-width: 720px;
      margin-bottom: 34px;
    }

    .about-page .section-head span {
      color: var(--theme);
      font-size: 14px;
      font-weight: 800;
    }

    .about-page .section-head h2 {
      margin: 8px 0 10px;
      color: #10213b;
      font-size: 34px;
      line-height: 1.25;
      letter-spacing: 0;
    }

    .about-page .section-head p {
      margin: 0;
      color: var(--muted);
    }

    .about-page .principle-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      border-top: 1px solid var(--line);
      border-left: 1px solid var(--line);
    }

    .about-page .principle-card {
      min-height: 245px;
      padding: 30px;
      border-right: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }

    .about-page .principle-number {
      color: #91a9ce;
      font-size: 13px;
      font-weight: 800;
    }

    .about-page .principle-card h3 {
      margin: 34px 0 10px;
      font-size: 21px;
    }

    .about-page .principle-card p {
      margin: 0;
      color: var(--muted);
    }

    .about-page .service-band {
      padding: 76px 0;
      background: var(--surface);
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }

    .about-page .service-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .about-page .service-item {
      padding: 25px;
      display: grid;
      grid-template-columns: 48px 1fr;
      gap: 17px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 6px;
    }

    .about-page .service-icon {
      width: 48px;
      height: 48px;
      display: grid;
      place-items: center;
      color: var(--white);
      background: var(--theme);
      border-radius: 5px;
      font-size: 18px;
      font-weight: 800;
    }

    .about-page .service-item h3 {
      margin: 0 0 5px;
      font-size: 18px;
    }

    .about-page .service-item p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .about-page .standards {
      padding: 76px 0;
    }

    .about-page .standards-layout {
      display: grid;
      grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
      gap: 60px;
      align-items: start;
    }

    .about-page .standards-copy {
      position: sticky;
      top: 30px;
    }

    .about-page .standards-copy h2 {
      margin: 0 0 14px;
      font-size: 34px;
      line-height: 1.25;
    }

    .about-page .standards-copy p {
      color: var(--muted);
    }

    .about-page .standard-row {
      padding: 23px 0;
      display: grid;
      grid-template-columns: 42px 1fr;
      gap: 15px;
      border-top: 1px solid var(--line);
    }

    .about-page .standard-row:last-child {
      border-bottom: 1px solid var(--line);
    }

    .about-page .standard-mark {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      color: var(--theme);
      background: var(--theme-light);
      border-radius: 50%;
      font-weight: 900;
    }

    .about-page .standard-row h3 {
      margin: 0 0 5px;
      font-size: 18px;
    }

    .about-page .standard-row p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .about-page .trust-band {
      padding: 62px 0;
      color: var(--white);
      background: #081b38;
    }

    .about-page .trust-inner {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 30px;
      align-items: center;
    }

    .about-page .trust-inner h2 {
      margin: 0 0 8px;
      font-size: 30px;
    }

    .about-page .trust-inner p {
      max-width: 720px;
      margin: 0;
      color: #bdcce2;
    }

    .about-page .trust-inner a {
      padding: 11px 19px;
      color: var(--theme-dark);
      background: var(--white);
      border-radius: 4px;
      font-weight: 800;
    }

    .footer {
      padding: 58px 0 0;
      color: #bbc8da;
      background: #061327;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 42px;
    }

    .footer h4,
    .footer strong {
      color: var(--white);
    }

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

    .footer h4 {
      margin: 0 0 15px;
      font-size: 15px;
    }

    .footer p {
      margin: 7px 0;
      font-size: 14px;
    }

    .footer-grid > div > a {
      margin: 8px 0;
      display: block;
      color: #bbc8da;
      font-size: 14px;
    }

    .footer-grid > div > a:hover {
      color: var(--white);
    }

    .footer-bottom {
      margin-top: 44px;
      min-height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      color: #91a0b5;
      border-top: 1px solid rgba(255,255,255,.1);
      font-size: 13px;
    }

    @media (max-width: 1060px) {
      .main-nav {
        display: none;
      }

      .header-inner {
        min-height: 68px;
      }

      .logo {
        margin-right: auto;
      }

      .hamburger {
        display: flex;
      }

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

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

    @media (max-width: 720px) {
      .container {
        width: min(100% - 28px, 1180px);
      }

      .topbar .container {
        padding: 7px 0;
        align-items: flex-start;
        flex-direction: column;
        gap: 2px;
      }

      .topbar a {
        margin: 0 14px 0 0;
      }

      .logo {
        min-width: 0;
      }

      .logo span {
        max-width: 145px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
      }

      .member-btn {
        display: none;
      }

      .open-btn {
        padding: 7px 11px;
      }

      .about-page .about-hero {
        min-height: 460px;
        padding: 70px 0;
      }

      .about-page h1 {
        font-size: 42px;
      }

      .about-page .hero-copy {
        font-size: 16px;
      }

      .about-page .principles,
      .about-page .service-band,
      .about-page .standards {
        padding: 56px 0;
      }

      .about-page .section-head h2,
      .about-page .standards-copy h2 {
        font-size: 28px;
      }

      .about-page .principle-grid,
      .about-page .service-list,
      .about-page .standards-layout,
      .about-page .trust-inner {
        grid-template-columns: 1fr;
      }

      .about-page .principle-card {
        min-height: 210px;
      }

      .about-page .standards-layout {
        gap: 28px;
      }

      .about-page .standards-copy {
        position: static;
      }

      .about-page .trust-inner {
        align-items: start;
      }

      .about-page .trust-inner a {
        justify-self: start;
      }

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

      .footer-bottom {
        padding: 18px 0;
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
      }
    }

    @media (max-width: 430px) {
      .header-btns {
        gap: 6px;
      }

      .open-btn {
        display: none;
      }

      .about-page h1 {
        font-size: 36px;
      }

      .about-page .service-item {
        padding: 20px;
        grid-template-columns: 40px 1fr;
      }

      .about-page .service-icon {
        width: 40px;
        height: 40px;
      }
    }