:root {
      --theme: #0B3D91;
      --theme-dark: #072b68;
      --theme-soft: #eaf1fb;
      --ink: #172033;
      --muted: #687386;
      --line: #dce3ec;
      --surface: #ffffff;
      --page: #f5f7fa;
      --success: #087f5b;
      --shadow: 0 14px 36px rgba(20, 35, 60, .09);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: var(--page);
      font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
    }

    body,
    button,
    input {
      font-size: 15px;
    }

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

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

    button {
      color: inherit;
      font-family: inherit;
    }

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

    .topbar {
      color: #dce9ff;
      background: #061d43;
      font-size: 13px;
    }

    .topbar .container {
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .topbar span:last-child {
      display: flex;
      align-items: center;
      gap: 22px;
    }

    .topbar a {
      color: #dce9ff;
    }

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

    .header {
      position: relative;
      z-index: 50;
      background: rgba(255, 255, 255, .98);
      border-bottom: 1px solid var(--line);
      box-shadow: 0 4px 18px rgba(22, 35, 58, .04);
    }

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

    .logo {
      min-width: 180px;
      display: inline-flex;
      align-items: center;
      gap: 11px;
      color: var(--theme-dark);
      font-size: 18px;
      font-weight: 800;
      white-space: nowrap;
    }

    .logo img {
      width: 42px;
      height: 42px;
      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: static;
      display: flex;
      align-items: center;
    }

    .nav-link {
      height: 100%;
      padding: 0 14px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #26344c;
      font-weight: 650;
      white-space: nowrap;
      border-bottom: 3px solid transparent;
      transition: color .2s ease, border-color .2s ease;
    }

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

    .has-arrow::after {
      width: 6px;
      height: 6px;
      content: "";
      border-right: 1.5px solid currentColor;
      border-bottom: 1.5px solid currentColor;
      transform: rotate(45deg) translateY(-2px);
      transition: transform .2s ease;
    }

    .nav-item:hover .has-arrow::after,
    .nav-item:focus-within .has-arrow::after {
      transform: rotate(225deg) translate(-1px, -1px);
    }

    .dropdown-panel,
    .mega-menu {
      position: absolute;
      top: 100%;
      z-index: 60;
      visibility: hidden;
      opacity: 0;
      color: var(--ink);
      background: var(--surface);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      transform: translateY(8px);
      transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
      pointer-events: none;
    }

    .dropdown-panel {
      width: 310px;
      margin-left: -20px;
      padding: 12px;
      border-radius: 0 0 6px 6px;
    }

    .mega-menu {
      left: 50%;
      width: min(1080px, calc(100vw - 40px));
      border-radius: 0 0 6px 6px;
      transform: translate(-50%, 8px);
    }

    .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;
      pointer-events: auto;
    }

    .nav-item:hover .dropdown-panel,
    .nav-item:focus-within .dropdown-panel {
      transform: translateY(0);
    }

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

    .dropdown-panel > a:not(.mega-footer) {
      display: block;
      padding: 10px 12px;
      overflow: hidden;
      color: #33415b;
      text-overflow: ellipsis;
      white-space: nowrap;
      border-radius: 4px;
    }

    .dropdown-panel > a:not(.mega-footer):hover {
      color: var(--theme);
      background: var(--theme-soft);
    }

    .mega-grid {
      padding: 24px;
      display: grid;
      grid-template-columns: 230px minmax(0, 1fr);
      gap: 28px;
    }

    .mega-grid h4 {
      margin: 0 0 8px;
      color: var(--theme-dark);
      font-size: 17px;
    }

    .mega-grid p {
      margin: 0 0 14px;
      color: var(--muted);
      font-size: 13px;
    }

    .mega-grid > div:first-child > a {
      display: block;
      margin: 7px 0;
      color: var(--theme);
      font-size: 14px;
      font-weight: 650;
    }

    .mega-cards {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
    }

    .mega-card {
      min-width: 0;
      min-height: 72px;
      padding: 12px;
      display: grid;
      grid-template-columns: auto minmax(0, 1fr);
      align-content: center;
      gap: 3px 9px;
      border: 1px solid #e3e8ef;
      border-radius: 5px;
      transition: border-color .2s ease, background .2s ease;
    }

    .mega-card:hover {
      border-color: #a9bfe2;
      background: #f7faff;
    }

    .mega-card img {
      width: 28px;
      height: 28px;
      grid-row: 1 / span 2;
      object-fit: contain;
    }

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

    .mega-card b {
      color: #25334b;
      font-size: 14px;
    }

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

    .mega-footer {
      padding: 11px 24px;
      display: block;
      color: var(--theme);
      background: #f4f7fb;
      border-top: 1px solid var(--line);
      font-size: 13px;
      font-weight: 700;
      text-align: right;
    }

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

    .member-btn {
      display: inline-flex;
      align-items: center;
    }

    .open-btn {
      min-height: 38px;
      padding: 7px 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      background: var(--theme);
      border: 1px solid var(--theme);
      border-radius: 4px;
      font-weight: 700;
    }

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

    .hamburger {
      width: 42px;
      height: 42px;
      padding: 9px;
      display: none;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: 1px solid var(--line);
      border-radius: 4px;
      cursor: pointer;
    }

    .hamburger span {
      width: 21px;
      height: 2px;
      display: block;
      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(7, 16, 31, .56);
      transition: opacity .25s ease, visibility .25s ease;
    }

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

    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      z-index: 100;
      width: min(390px, 92vw);
      height: 100vh;
      visibility: hidden;
      background: #ffffff;
      box-shadow: -18px 0 50px rgba(0, 0, 0, .16);
      transform: translateX(100%);
      transition: transform .25s ease, visibility .25s ease;
      overflow-y: auto;
    }

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

    .drawer-head {
      min-height: 72px;
      padding: 14px 16px;
      display: flex;
      align-items: center;
      gap: 12px;
      background: var(--theme-dark);
      color: #ffffff;
    }

    .drawer-head > a {
      padding: 7px 13px;
      color: #ffffff;
      border: 1px solid rgba(255, 255, 255, .42);
      border-radius: 4px;
      font-weight: 700;
    }

    .drawer-close {
      width: 38px;
      height: 38px;
      margin-left: auto;
      color: #ffffff;
      background: transparent;
      border: 0;
      font-size: 27px;
      line-height: 1;
      cursor: pointer;
    }

    .drawer-menu {
      padding: 12px 16px 28px;
    }

    .drawer-link,
    .drawer-toggle {
      width: 100%;
      min-height: 48px;
      padding: 11px 8px;
      display: flex;
      align-items: center;
      text-align: left;
      background: transparent;
      border: 0;
      border-bottom: 1px solid #e8ecf2;
      cursor: pointer;
      font-weight: 700;
    }

    .drawer-toggle {
      justify-content: space-between;
    }

    .drawer-toggle::after {
      width: 8px;
      height: 8px;
      content: "";
      border-right: 2px solid var(--muted);
      border-bottom: 2px solid var(--muted);
      transform: rotate(45deg);
      transition: transform .2s ease;
    }

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

    .drawer-submenu {
      max-height: 0;
      padding: 0 10px;
      overflow: hidden;
      background: #f7f9fc;
      transition: max-height .3s ease, padding .3s ease;
    }

    .drawer-submenu.open {
      max-height: 680px;
      padding: 7px 10px;
    }

    .drawer-submenu a {
      padding: 8px 9px;
      display: block;
      color: #536078;
      font-size: 14px;
      border-bottom: 1px solid #e9edf3;
    }

    .drawer-submenu a:last-child {
      border-bottom: 0;
    }

    .tag-index-page {
      min-height: 640px;
    }

    .tag-index-page .tag-heading {
      position: relative;
      overflow: hidden;
      color: #ffffff;
      background:
        linear-gradient(rgba(5, 27, 66, .92), rgba(11, 61, 145, .94)),
        #0B3D91;
      border-bottom: 1px solid rgba(255, 255, 255, .12);
    }

    .tag-index-page .tag-heading::before,
    .tag-index-page .tag-heading::after {
      position: absolute;
      content: "";
      border: 1px solid rgba(216, 228, 247, .18);
      border-radius: 50%;
      pointer-events: none;
    }

    .tag-index-page .tag-heading::before {
      width: 380px;
      height: 380px;
      top: -250px;
      right: 6%;
    }

    .tag-index-page .tag-heading::after {
      width: 220px;
      height: 220px;
      bottom: -170px;
      left: 7%;
    }

    .tag-index-page .heading-inner {
      position: relative;
      z-index: 1;
      padding: 68px 0 62px;
    }

    .tag-index-page .breadcrumb {
      margin: 0 0 20px;
      display: flex;
      align-items: center;
      gap: 9px;
      color: #c8d9f4;
      font-size: 13px;
    }

    .tag-index-page .breadcrumb a:hover {
      color: #ffffff;
    }

    .tag-index-page .breadcrumb span::before {
      margin-right: 9px;
      content: "/";
      color: #89a7d5;
    }

    .tag-index-page h1 {
      margin: 0;
      font-size: clamp(32px, 5vw, 52px);
      line-height: 1.2;
      letter-spacing: 0;
    }

    .tag-index-page .heading-copy {
      max-width: 720px;
      margin: 15px 0 0;
      color: #d8e4f7;
      font-size: 17px;
    }

    .tag-index-page .tag-directory {
      padding: 46px 0 72px;
    }

    .tag-index-page .directory-bar {
      margin-bottom: 24px;
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
    }

    .tag-index-page .directory-bar h2 {
      margin: 0 0 5px;
      color: #18243a;
      font-size: 25px;
      line-height: 1.3;
    }

    .tag-index-page .directory-bar p {
      margin: 0;
      color: var(--muted);
    }

    .tag-index-page .directory-mark {
      padding: 7px 11px;
      color: var(--theme);
      background: var(--theme-soft);
      border: 1px solid #cbdaf1;
      border-radius: 4px;
      font-size: 13px;
      font-weight: 700;
      white-space: nowrap;
    }

    .tag-index-page .tag-cloud-panel {
      position: relative;
      min-height: 330px;
      padding: 34px;
      background: #ffffff;
      border: 1px solid var(--line);
      border-top: 4px solid var(--theme);
      border-radius: 6px;
      box-shadow: 0 12px 34px rgba(26, 43, 72, .07);
    }

    .tag-index-page .tag-cloud-panel::after {
      position: absolute;
      right: 24px;
      bottom: 18px;
      color: #e8eef7;
      content: "#";
      font-size: 92px;
      font-weight: 800;
      line-height: 1;
      pointer-events: none;
    }

    .tag-index-page .tag-cloud {
      position: relative;
      z-index: 1;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }

    .tag-index-page .tag-item {
      min-height: 46px;
      padding: 9px 15px;
      display: inline-flex;
      align-items: center;
      gap: 9px;
      color: #263750;
      background: #f7f9fc;
      border: 1px solid #dfe5ed;
      border-radius: 5px;
      transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease;
    }

    .tag-index-page .tag-item:nth-child(4n+1) {
      font-size: 18px;
      font-weight: 750;
    }

    .tag-index-page .tag-item:nth-child(4n+2) {
      color: var(--theme-dark);
      background: #edf3fc;
      border-color: #c9d8ef;
    }

    .tag-index-page .tag-item:nth-child(5n) {
      font-size: 16px;
      font-weight: 700;
    }

    .tag-index-page .tag-item:hover {
      color: #ffffff;
      background: var(--theme);
      border-color: var(--theme);
      transform: translateY(-2px);
    }

    .tag-index-page .tag-item::before {
      color: #7891b7;
      content: "#";
      font-weight: 800;
    }

    .tag-index-page .tag-item:hover::before {
      color: #dce9ff;
    }

    .tag-index-page .tag-count {
      min-width: 25px;
      padding: 1px 6px;
      color: #61708a;
      background: #ffffff;
      border: 1px solid #dce3ec;
      border-radius: 3px;
      font-size: 11px;
      text-align: center;
    }

    .tag-index-page .tag-item:hover .tag-count {
      color: var(--theme-dark);
      border-color: #ffffff;
    }

    .tag-index-page .research-strip {
      margin-top: 28px;
      padding: 22px 24px;
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 20px;
      background: #eef2f7;
      border: 1px solid #dce3ec;
      border-radius: 6px;
    }

    .tag-index-page .research-item {
      min-width: 0;
      padding-left: 16px;
      border-left: 3px solid var(--theme);
    }

    .tag-index-page .research-item strong {
      display: block;
      color: #263750;
      font-size: 15px;
    }

    .tag-index-page .research-item span {
      display: block;
      margin-top: 4px;
      color: var(--muted);
      font-size: 13px;
    }

    .footer {
      color: #cbd5e5;
      background: #101827;
    }

    .footer .container {
      padding-top: 48px;
      padding-bottom: 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.45fr .9fr .9fr 1.1fr;
      gap: 42px;
    }

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

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

    .footer p {
      margin: 8px 0;
      color: #aeb9ca;
      font-size: 13px;
    }

    .footer-grid > div > a {
      margin: 8px 0;
      display: block;
      color: #cbd5e5;
      font-size: 14px;
    }

    .footer-grid > div > a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      margin-top: 34px;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      gap: 20px;
      color: #929fb3;
      border-top: 1px solid rgba(255, 255, 255, .11);
      font-size: 12px;
    }

    @media (max-width: 1100px) {
      .main-nav {
        display: none;
      }

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

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

      .hamburger {
        display: flex;
      }

      .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

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

      .topbar .container {
        min-height: 42px;
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        gap: 1px;
      }

      .topbar span:last-child {
        width: 100%;
        justify-content: space-between;
        gap: 10px;
      }

      .logo {
        min-width: 0;
        max-width: 48vw;
      }

      .logo span {
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .logo img {
        width: 36px;
        height: 36px;
      }

      .header-btns {
        gap: 7px;
      }

      .member-btn {
        display: none;
      }

      .open-btn {
        min-height: 36px;
        padding: 6px 12px;
      }

      .tag-index-page .heading-inner {
        padding: 48px 0 45px;
      }

      .tag-index-page h1 {
        font-size: 34px;
      }

      .tag-index-page .heading-copy {
        font-size: 15px;
      }

      .tag-index-page .tag-directory {
        padding: 34px 0 50px;
      }

      .tag-index-page .directory-bar {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
      }

      .tag-index-page .tag-cloud-panel {
        min-height: 280px;
        padding: 22px 18px;
      }

      .tag-index-page .tag-cloud {
        gap: 10px;
      }

      .tag-index-page .tag-item,
      .tag-index-page .tag-item:nth-child(4n+1),
      .tag-index-page .tag-item:nth-child(5n) {
        min-height: 42px;
        padding: 7px 11px;
        font-size: 14px;
      }

      .tag-index-page .research-strip {
        grid-template-columns: 1fr;
      }

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

      .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
      }
    }

    @media (max-width: 410px) {
      .topbar span:last-child {
        align-items: flex-start;
        flex-direction: column;
      }

      .header-inner {
        gap: 10px;
      }

      .open-btn {
        display: none;
      }

      .tag-index-page .tag-cloud-panel {
        padding: 18px 14px;
      }
    }