:root {
      --theme: #0B3D91;
      --theme-dark: #082d6b;
      --ink: #172033;
      --muted: #667085;
      --line: #e5eaf1;
      --soft: #f4f7fb;
      --white: #ffffff;
      --accent: #dba84a;
      --radius: 12px;
      --shadow: 0 12px 35px rgba(15, 38, 73, .08);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

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

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

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

    button {
      font: inherit;
    }

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

    .topbar {
      color: #dbe7f8;
      background: #10223d;
      font-size: 13px;
    }

    .topbar .container {
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .topbar-info {
      display: flex;
      align-items: center;
      gap: 20px;
    }

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

    .header {
      position: relative;
      z-index: 20;
      background: #fff;
      border-bottom: 1px solid var(--line);
    }

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

    .logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      flex: 0 0 auto;
      color: var(--theme);
      font-size: 18px;
      font-weight: 800;
      white-space: nowrap;
    }

    .logo img {
      width: 34px;
      height: 34px;
      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 {
      min-height: 76px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 0 15px;
      color: #344054;
      font-size: 15px;
      white-space: nowrap;
    }

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

    .has-arrow::after {
      content: "";
      width: 6px;
      height: 6px;
      border-right: 1px solid currentColor;
      border-bottom: 1px solid currentColor;
      transform: rotate(45deg) translateY(-2px);
    }

    .dropdown-panel,
    .mega-menu {
      position: absolute;
      top: calc(100% - 1px);
      left: 50%;
      width: 330px;
      padding: 22px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 0 0 12px 12px;
      box-shadow: 0 20px 45px rgba(18, 39, 72, .14);
      opacity: 0;
      visibility: hidden;
      transform: translate(-50%, 8px);
      transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
    }

    .mega-menu {
      width: 620px;
    }

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

    .dropdown-panel::before,
    .mega-menu::before {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      top: -12px;
      height: 12px;
    }

    .mega-heading {
      margin: 0 0 12px;
      color: var(--theme);
      font-size: 14px;
      font-weight: 800;
    }

    .mega-list,
    .broker-mini,
    .video-mini,
    .product-mini {
      display: grid;
      gap: 8px;
    }

    .mega-list a,
    .broker-mini a,
    .video-mini a,
    .product-mini a {
      display: block;
      padding: 8px 10px;
      color: #475467;
      border-radius: 7px;
      font-size: 13px;
    }

    .mega-list a:hover,
    .broker-mini a:hover,
    .video-mini a:hover,
    .product-mini a:hover {
      color: var(--theme);
      background: var(--soft);
    }

    .broker-mini a strong,
    .product-mini a strong {
      color: var(--ink);
      font-size: 14px;
    }

    .broker-mini small,
    .video-mini small,
    .product-mini small {
      color: var(--muted);
    }

    .mega-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 26px;
    }

    .mega-menu p {
      margin: 0 0 12px;
      color: var(--muted);
      font-size: 13px;
    }

    .mega-menu img {
      display: inline-block;
      width: 20px;
      height: 20px;
      margin-right: 5px;
      vertical-align: middle;
      object-fit: contain;
    }

    .mega-footer {
      display: inline-flex;
      margin-top: 16px;
      color: var(--theme);
      font-size: 13px;
      font-weight: 700;
    }

    .header-btns {
      display: flex;
      align-items: center;
      gap: 10px;
      flex: 0 0 auto;
    }

    .member-btn,
    .open-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 38px;
      padding: 0 14px;
      border-radius: 7px;
      font-size: 13px;
      font-weight: 700;
    }

    .member-btn {
      color: var(--theme);
      border: 1px solid #cbd8eb;
    }

    .open-btn {
      color: #fff;
      background: var(--theme);
    }

    .member-btn:hover {
      background: var(--soft);
    }

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

    .hamburger {
      width: 42px;
      height: 40px;
      display: none;
      padding: 8px;
      border: 1px solid var(--line);
      border-radius: 7px;
      background: #fff;
      cursor: pointer;
    }

    .hamburger span {
      display: block;
      width: 22px;
      height: 2px;
      margin: 4px auto;
      background: var(--ink);
      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;
      inset: 0;
      z-index: 40;
      background: rgba(14, 28, 49, .46);
      opacity: 0;
      visibility: hidden;
      transition: opacity .2s ease, visibility .2s ease;
    }

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

    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      z-index: 50;
      width: min(390px, 88vw);
      height: 100vh;
      overflow-y: auto;
      background: #fff;
      box-shadow: -15px 0 40px rgba(14, 28, 49, .18);
      transform: translateX(100%);
      transition: transform .25s ease;
    }

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

    .drawer-head {
      min-height: 74px;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 16px 20px;
      color: var(--theme);
      border-bottom: 1px solid var(--line);
      font-weight: 800;
    }

    .drawer-head span {
      flex: 1;
    }

    .drawer-head a {
      color: #fff;
      padding: 7px 11px;
      border-radius: 6px;
      background: var(--theme);
      font-size: 13px;
    }

    .drawer-close {
      width: 34px;
      height: 34px;
      padding: 0;
      border: 0;
      color: var(--muted);
      background: transparent;
      font-size: 26px;
      line-height: 1;
      cursor: pointer;
    }

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

    .drawer-link,
    .drawer-toggle {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
      color: #344054;
      border: 0;
      border-bottom: 1px solid var(--line);
      background: transparent;
      text-align: left;
      font-size: 15px;
      cursor: pointer;
    }

    .drawer-toggle::after {
      content: "+";
      color: var(--theme);
      font-size: 20px;
    }

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

    .drawer-submenu {
      display: none;
      padding: 5px 0 8px 14px;
      border-bottom: 1px solid var(--line);
    }

    .drawer-submenu.open {
      display: grid;
      gap: 8px;
    }

    .drawer-submenu a {
      color: var(--muted);
      font-size: 14px;
    }

    .footer {
      padding: 54px 0 20px;
      color: #b8c5d8;
      background: #10223d;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
      gap: 38px;
    }

    .footer-brand {
      margin-bottom: 12px;
      color: #fff;
      font-size: 20px;
      font-weight: 800;
    }

    .footer p {
      margin: 0;
      font-size: 13px;
    }

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

    .footer a {
      display: block;
      width: max-content;
      max-width: 100%;
      margin: 7px 0;
      color: #b8c5d8;
      font-size: 13px;
    }

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

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      margin-top: 38px;
      padding-top: 18px;
      border-top: 1px solid rgba(255, 255, 255, .14);
      font-size: 12px;
    }

    .tool-detail-page {
      min-height: 620px;
      padding: 56px 0 78px;
      background: #f6f8fb;
    }

    .tool-breadcrumb {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 26px;
      color: var(--muted);
      font-size: 13px;
    }

    .tool-breadcrumb a {
      color: var(--theme);
    }

    .tool-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 320px;
      gap: 28px;
      align-items: start;
    }

    .tool-article,
    .tool-sidebar {
      min-width: 0;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .tool-article {
      padding: 34px 38px 42px;
    }

    .tool-head {
      display: flex;
      align-items: flex-start;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--line);
    }

    .tool-icon {
      width: 72px;
      height: 72px;
      flex: 0 0 72px;
      padding: 13px;
      border: 1px solid #dbe4f1;
      border-radius: 14px;
      background: #f3f7fc;
      object-fit: contain;
    }

    .tool-head h1 {
      margin: 0 0 8px;
      color: var(--ink);
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.25;
    }

    .tool-intro {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .tool-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 14px;
      color: var(--muted);
      font-size: 13px;
    }

    .tool-meta strong {
      color: var(--theme);
      font-weight: 700;
    }

    .tool-content {
      min-width: 0;
      max-width: 100%;
      overflow-x: auto;
      padding-top: 28px;
      color: #3b4658;
      font-size: 15px;
    }

    .tool-content h2,
    .tool-content h3 {
      color: var(--ink);
      line-height: 1.4;
    }

    .tool-content h2 {
      margin: 28px 0 12px;
      padding-left: 12px;
      border-left: 3px solid var(--accent);
      font-size: 22px;
    }

    .tool-content h3 {
      margin: 22px 0 10px;
      font-size: 18px;
    }

    .tool-content p {
      margin: 0 0 16px;
    }

    .tool-content ul,
    .tool-content ol {
      margin: 0 0 18px;
      padding-left: 24px;
    }

    .tool-content table {
      width: 100%;
      min-width: 520px;
      border-collapse: collapse;
      margin: 20px 0;
    }

    .tool-content th,
    .tool-content td {
      padding: 10px 12px;
      border: 1px solid var(--line);
      text-align: left;
    }

    .tool-content th {
      color: var(--ink);
      background: var(--soft);
    }

    .tool-content img {
      max-width: 100%;
      height: auto;
    }

    .tool-sidebar {
      padding: 24px;
    }

    .tool-sidebar h2 {
      margin: 0 0 17px;
      color: var(--ink);
      font-size: 19px;
    }

    .related-tool {
      display: grid;
      grid-template-columns: 44px minmax(0, 1fr);
      gap: 12px;
      padding: 14px 0;
      border-top: 1px solid var(--line);
    }

    .related-tool:first-of-type {
      border-top: 0;
    }

    .related-tool img {
      width: 44px;
      height: 44px;
      padding: 7px;
      border: 1px solid #dbe4f1;
      border-radius: 8px;
      object-fit: contain;
      background: #f3f7fc;
    }

    .related-tool strong {
      display: block;
      margin-bottom: 3px;
      color: var(--theme);
      font-size: 14px;
    }

    .related-tool p {
      display: -webkit-box;
      overflow: hidden;
      margin: 0;
      color: var(--muted);
      font-size: 12px;
      -webkit-box-orient: vertical;
      -webkit-line-clamp: 2;
    }

    .tool-back {
      display: inline-flex;
      align-items: center;
      min-height: 40px;
      margin-top: 20px;
      padding: 0 15px;
      color: #fff;
      border-radius: 7px;
      background: var(--theme);
      font-size: 13px;
      font-weight: 700;
    }

    .tool-back:hover {
      background: var(--theme-dark);
    }

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

      .header-btns .member-btn {
        display: none;
      }

      .hamburger {
        display: block;
      }

      .tool-layout {
        grid-template-columns: minmax(0, 1fr);
      }

      .tool-sidebar {
        order: 2;
      }

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

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

      .topbar .container,
      .topbar-info {
        gap: 10px;
      }

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

      .header-inner {
        min-height: 66px;
        gap: 12px;
      }

      .logo {
        min-width: 0;
        overflow: hidden;
        font-size: 16px;
        text-overflow: ellipsis;
      }

      .open-btn {
        padding: 0 10px;
      }

      .tool-detail-page {
        padding: 34px 0 52px;
      }

      .tool-article {
        padding: 24px 20px 30px;
      }

      .tool-head {
        gap: 14px;
      }

      .tool-icon {
        width: 56px;
        height: 56px;
        flex-basis: 56px;
        padding: 9px;
      }

      .tool-head h1 {
        font-size: 26px;
      }

      .footer {
        padding-top: 38px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 26px;
      }

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