:root {
      --theme: #0B3D91;
      --cyan: #0891B2;
      --ink: #172033;
      --muted: #667085;
      --line: #dfe7ef;
      --pale: #f2f8fb;
      --white: #ffffff;
      --shadow: 0 16px 42px rgba(15, 42, 68, .09);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: #f8fbfd;
      font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; }
    button { font: inherit; }
    .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

    .topbar {
      color: #dcecf4;
      background: #102537;
      font-size: 13px;
    }
    .topbar .container {
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .topbar-links {
      display: flex;
      gap: 20px;
      color: #b8d4e1;
    }
    .topbar a:hover { color: #fff; }

    .header {
      position: relative;
      z-index: 20;
      background: rgba(255, 255, 255, .97);
      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-weight: 800;
      font-size: 18px;
      white-space: nowrap;
    }
    .logo img {
      width: 34px;
      height: 34px;
      object-fit: contain;
    }
    .main-nav { margin-left: auto; }
    .nav-list {
      display: flex;
      align-items: stretch;
      gap: 2px;
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .nav-item { position: relative; }
    .nav-link {
      min-height: 76px;
      display: flex;
      align-items: center;
      padding: 0 13px;
      color: #263746;
      font-size: 14px;
      white-space: nowrap;
    }
    .nav-link:hover,
    .nav-item:focus-within > .nav-link { color: var(--cyan); }
    .has-arrow::after {
      content: "";
      width: 6px;
      height: 6px;
      margin: 0 0 3px 8px;
      border-right: 1px solid currentColor;
      border-bottom: 1px solid currentColor;
      transform: rotate(45deg);
    }
    .dropdown-panel,
    .mega-menu {
      position: absolute;
      top: calc(100% - 1px);
      left: 0;
      z-index: 10;
      visibility: hidden;
      opacity: 0;
      transform: translateY(8px);
      transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }
    .dropdown-panel {
      width: 250px;
      padding: 10px;
    }
    .dropdown-panel a,
    .mega-footer {
      display: block;
      padding: 10px 12px;
      color: #394b5a;
      font-size: 13px;
    }
    .dropdown-panel a:hover,
    .mega-footer:hover { color: var(--cyan); background: var(--pale); }
    .mega-menu {
      width: 650px;
      padding: 20px;
      left: 50%;
      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;
      transform: translate(-50%, 0);
    }
    .nav-item:first-child:hover > .dropdown-panel,
    .nav-item:first-child:focus-within > .dropdown-panel {
      transform: translateY(0);
    }
    .mega-title {
      margin: 0 0 12px;
      color: var(--theme);
      font-size: 13px;
      font-weight: 800;
    }
    .mega-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 9px;
    }
    .mega-card {
      min-height: 78px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 4px;
      padding: 11px;
      border: 1px solid var(--line);
      background: #fbfdfe;
    }
    .mega-card:hover { border-color: var(--cyan); background: var(--pale); }
    .mega-card img {
      width: 23px;
      height: 23px;
      object-fit: contain;
    }
    .mega-card strong {
      overflow: hidden;
      color: #263746;
      font-size: 13px;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .mega-card small {
      overflow: hidden;
      color: var(--muted);
      font-size: 11px;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .mega-footer {
      margin-top: 14px;
      border-top: 1px solid var(--line);
      font-weight: 700;
    }
    .header-btns {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .member-btn,
    .open-btn {
      padding: 9px 13px;
      font-size: 13px;
      font-weight: 700;
      white-space: nowrap;
    }
    .member-btn { color: var(--theme); }
    .open-btn {
      color: #fff;
      background: var(--theme);
    }
    .open-btn:hover { background: var(--cyan); }
    .hamburger {
      display: none;
      width: 42px;
      height: 42px;
      padding: 9px;
      border: 1px solid var(--line);
      background: #fff;
      cursor: pointer;
    }
    .hamburger span {
      display: block;
      height: 2px;
      margin: 5px 0;
      background: var(--theme);
      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: 40;
      visibility: hidden;
      opacity: 0;
      background: rgba(11, 28, 43, .48);
      transition: opacity .2s ease, visibility .2s ease;
    }
    .drawer-overlay.open {
      visibility: visible;
      opacity: 1;
    }
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      bottom: 0;
      z-index: 50;
      width: min(360px, 88vw);
      overflow-y: auto;
      visibility: hidden;
      transform: translateX(100%);
      background: #fff;
      box-shadow: -12px 0 35px rgba(15, 42, 68, .16);
      transition: transform .25s ease, visibility .25s ease;
    }
    .mobile-drawer.open {
      visibility: visible;
      transform: translateX(0);
    }
    .drawer-head {
      min-height: 72px;
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px 20px;
      color: var(--theme);
      border-bottom: 1px solid var(--line);
      font-weight: 800;
    }
    .drawer-head > :first-child { margin-right: auto; }
    .drawer-head a { color: var(--cyan); font-size: 13px; }
    .drawer-close {
      width: 34px;
      height: 34px;
      padding: 0;
      border: 0;
      color: var(--theme);
      background: var(--pale);
      cursor: pointer;
      font-size: 24px;
      line-height: 1;
    }
    .drawer-menu { padding: 12px 20px 28px; }
    .drawer-link,
    .drawer-toggle {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 13px 0;
      color: #263746;
      border: 0;
      border-bottom: 1px solid var(--line);
      background: transparent;
      text-align: left;
      cursor: pointer;
      font-weight: 700;
    }
    .drawer-toggle::after {
      content: "+";
      color: var(--cyan);
      font-size: 20px;
      font-weight: 400;
    }
    .drawer-toggle.active::after { content: "−"; }
    .drawer-submenu {
      display: none;
      padding: 5px 0 8px 14px;
      border-bottom: 1px solid var(--line);
    }
    .drawer-submenu.open { display: block; }
    .drawer-submenu a {
      display: block;
      padding: 8px 0;
      color: var(--muted);
      font-size: 13px;
    }
    .drawer-submenu a:hover { color: var(--cyan); }

    .tool-detail-page {
      padding: 56px 0 80px;
    }
    .tool-detail-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 310px;
      gap: 28px;
      align-items: start;
    }
    .tool-detail-card,
    .related-tools {
      border: 1px solid var(--line);
      background: var(--white);
      box-shadow: var(--shadow);
    }
    .tool-detail-card { padding: clamp(24px, 5vw, 52px); }
    .tool-breadcrumb {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
      color: var(--muted);
      font-size: 13px;
    }
    .tool-breadcrumb a { color: var(--cyan); }
    .tool-heading {
      display: flex;
      align-items: flex-start;
      gap: 18px;
      padding-bottom: 26px;
      border-bottom: 1px solid var(--line);
    }
    .tool-icon {
      width: 72px;
      height: 72px;
      flex: 0 0 72px;
      padding: 12px;
      object-fit: contain;
      border: 1px solid #c8e4ed;
      background: var(--pale);
    }
    .tool-heading h1 {
      margin: 0 0 8px;
      color: var(--theme);
      font-size: clamp(28px, 4vw, 44px);
      line-height: 1.2;
    }
    .tool-intro {
      margin: 0;
      color: var(--muted);
      font-size: 16px;
    }
    .tool-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 20px;
      margin: 22px 0 30px;
      color: var(--muted);
      font-size: 13px;
    }
    .tool-meta span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .tool-meta strong { color: var(--ink); }
    .tool-content {
      min-width: 0;
      max-width: 100%;
      overflow-x: auto;
      color: #354858;
      font-size: 16px;
    }
    .tool-content h2,
    .tool-content h3 {
      color: var(--theme);
      line-height: 1.35;
    }
    .tool-content img,
    .tool-content video,
    .tool-content iframe {
      max-width: 100%;
    }
    .tool-content table {
      display: block;
      max-width: 100%;
      overflow-x: auto;
      border-collapse: collapse;
    }
    .tool-content table th,
    .tool-content table td {
      padding: 10px 12px;
      border: 1px solid var(--line);
    }
    .tool-content blockquote {
      margin: 24px 0;
      padding: 16px 20px;
      border-left: 4px solid var(--cyan);
      background: var(--pale);
    }
    .related-tools {
      position: sticky;
      top: 20px;
      padding: 22px;
    }
    .related-tools h2 {
      margin: 0 0 16px;
      color: var(--theme);
      font-size: 20px;
    }
    .related-tool-item {
      display: grid;
      grid-template-columns: 44px minmax(0, 1fr);
      gap: 12px;
      padding: 14px 0;
      border-top: 1px solid var(--line);
    }
    .related-tool-item img {
      width: 44px;
      height: 44px;
      padding: 7px;
      object-fit: contain;
      border: 1px solid var(--line);
      background: var(--pale);
    }
    .related-tool-item strong {
      display: block;
      margin-bottom: 3px;
      color: var(--ink);
      font-size: 14px;
    }
    .related-tool-item small {
      display: -webkit-box;
      overflow: hidden;
      color: var(--muted);
      font-size: 12px;
      -webkit-box-orient: vertical;
      -webkit-line-clamp: 2;
    }

    .footer {
      padding: 54px 0 22px;
      color: #c2d4df;
      background: #102537;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 34px;
    }
    .footer-brand strong {
      display: block;
      margin-bottom: 12px;
      color: #fff;
      font-size: 19px;
    }
    .footer p { margin: 0 0 12px; font-size: 13px; }
    .footer h3 {
      margin: 0 0 14px;
      color: #fff;
      font-size: 14px;
    }
    .footer-grid > div:not(.footer-brand) a,
    .footer-grid > div:not(.footer-brand) span {
      display: block;
      margin: 7px 0;
      color: #c2d4df;
      font-size: 13px;
    }
    .footer a:hover { color: #fff; }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      margin-top: 38px;
      padding-top: 18px;
      color: #89a6b7;
      border-top: 1px solid rgba(207, 231, 240, .18);
      font-size: 12px;
    }

    @media (max-width: 1080px) {
      .main-nav { display: none; }
      .hamburger { display: block; }
      .header-btns { margin-left: auto; }
      .tool-detail-layout { grid-template-columns: minmax(0, 1fr) 270px; }
    }

    @media (max-width: 760px) {
      .container { width: min(100% - 28px, 620px); }
      .topbar .container {
        min-height: 48px;
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        gap: 1px;
      }
      .topbar-links { gap: 12px; font-size: 12px; }
      .member-btn { display: none; }
      .header-inner { min-height: 68px; gap: 10px; }
      .logo { font-size: 16px; }
      .logo img { width: 30px; height: 30px; }
      .open-btn { padding: 8px 10px; font-size: 12px; }
      .tool-detail-page { padding: 30px 0 54px; }
      .tool-detail-layout { display: block; }
      .tool-detail-card { padding: 24px 18px; }
      .tool-heading { gap: 13px; }
      .tool-icon {
        width: 54px;
        height: 54px;
        flex-basis: 54px;
        padding: 8px;
      }
      .tool-heading h1 { font-size: 28px; }
      .tool-intro { font-size: 14px; }
      .tool-content { font-size: 15px; }
      .related-tools {
        position: static;
        margin-top: 20px;
        padding: 18px;
      }
      .footer { padding-top: 38px; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px 18px; }
      .footer-brand { grid-column: 1 / -1; }
      .footer-bottom { display: block; }
      .footer-bottom span { display: block; margin-top: 7px; }
    }

    @media (max-width: 430px) {
      .topbar-links { flex-direction: column; gap: 0; }
      .open-btn { display: none; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-brand { grid-column: auto; }
    }