:root {
      --blue: #0b1975;
      --blue-2: #172796;
      --blue-3: #eef2ff;
      --cyan: #78e5d8;
      --cyan-2: #e8fffb;
      --yellow: #ffd21e;
      --text: #09145a;
      --muted: #667089;
      --line: #d9e1ef;
      --bg: #f5f7fb;
      --white: #fff;
      --shadow: 0 12px 30px rgba(9, 20, 90, .08);
      --shadow-2: 0 18px 44px rgba(9, 20, 90, .12);
      --radius: 16px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      color: var(--text);
      background: var(--bg);
      line-height: 1.75;
    }

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

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

    .topbar {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, .95);
      border-bottom: 1px solid var(--line);
      overflow: visible;
    }

    .nav {
      min-height: 68px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      overflow: visible;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 900;
      color: var(--blue);
      letter-spacing: -.03em;
      white-space: nowrap;
    }

    .brand-mark {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      color: var(--blue);
      background: linear-gradient(135deg, var(--cyan-2), #c9fff6);
      border: 1px solid #bbefe8;
      font-weight: 900;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      color: #364163;
      font-size: 14px;
    }

    .nav-links a {
      padding: 8px 11px;
      border-radius: 999px;
    }

    .nav-links a:hover {
      background: #edf2fb;
      color: var(--blue);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 10px;
      margin-left: auto;
      overflow: visible;
    }

    .language-switcher {
      position: relative;
      z-index: 1001;
      flex: 0 0 auto;
      margin: 0;
      border: 0;
      background: transparent;
      box-shadow: none;
      overflow: visible;
    }

    .language-switcher summary {
      min-height: 36px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 0 13px;
      border: 1px solid var(--line);
      border-radius: 999px;
      background: #fff;
      color: var(--blue);
      font-size: 14px;
      font-weight: 900;
      cursor: pointer;
      list-style: none;
      box-shadow: var(--shadow);
    }

    .language-switcher summary::-webkit-details-marker {
      display: none;
    }

    .language-switcher summary::after {
      content: "";
      width: 0;
      height: 0;
      border-left: 4px solid transparent;
      border-right: 4px solid transparent;
      border-top: 5px solid currentColor;
    }

    .language-switcher[open] summary::after {
      transform: rotate(180deg);
    }

    .language-menu {
      position: absolute;
      top: calc(100% + 10px);
      right: 0;
      z-index: 1002;
      width: 340px;
      max-height: min(520px, calc(100vh - 110px));
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 6px;
      overflow: auto;
      padding: 10px;
      border: 1px solid var(--line);
      border-radius: 18px;
      background: #fff;
      box-shadow: var(--shadow-2);
    }

    .language-menu a {
      min-height: 36px;
      display: flex;
      align-items: center;
      padding: 7px 10px;
      border-radius: 11px;
      color: #364163;
      font-size: 13px;
      font-weight: 800;
    }

    .language-menu a:hover,
    .language-menu a.active {
      background: #edf2fb;
      color: var(--blue);
    }

    .top-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 38px;
      padding: 0 18px;
      border-radius: 10px;
      background: var(--yellow);
      color: var(--blue);
      font-weight: 900;
      box-shadow: 0 8px 18px rgba(255, 210, 30, .28);
      white-space: nowrap;
    }

    .hero {
      padding: 70px 0 60px;
      background:
              radial-gradient(circle at 12% 15%, rgba(120, 229, 216, .22), transparent 28%),
              radial-gradient(circle at 90% 8%, rgba(255, 210, 30, .16), transparent 24%),
              linear-gradient(180deg, #f9fbff 0%, #f3f6fb 100%);
      border-bottom: 1px solid var(--line);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 44px;
      align-items: center;
    }

    .tag {
      display: inline-flex;
      padding: 4px 12px;
      border-radius: 999px;
      background: #dffff9;
      color: #087268;
      font-size: 12px;
      font-weight: 900;
      letter-spacing: .08em;
      text-transform: uppercase;
      margin-bottom: 18px;
    }

    h1,
    h2,
    h3 {
      margin: 0;
      line-height: 1.22;
      letter-spacing: -.04em;
    }

    h1 {
      font-size: 64px;
      max-width: 760px;
      color: var(--blue);
    }

    .hero-desc {
      max-width: 720px;
      margin: 22px 0 0;
      color: var(--muted);
      font-size: 17px;
    }

    .hero-desc strong {
      color: var(--blue);
    }

    .actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 32px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 22px;
      border-radius: 12px;
      border: 1px solid transparent;
      font-weight: 900;
      transition: transform .18s ease, box-shadow .18s ease;
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .btn-primary {
      color: #fff;
      background: var(--blue);
      box-shadow: 0 12px 26px rgba(11, 25, 117, .24);
    }

    .btn-light {
      color: var(--blue);
      background: #fff;
      border-color: var(--line);
      box-shadow: var(--shadow);
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: 30px;
    }

    .stat {
      padding: 16px;
      border: 1px solid var(--line);
      border-radius: 16px;
      background: rgba(255, 255, 255, .8);
    }

    .stat b {
      display: block;
      font-size: 24px;
      line-height: 1.15;
      color: var(--blue);
      margin-bottom: 4px;
    }

    .stat span {
      color: var(--muted);
      font-size: 13px;
    }

    .preview {
      padding: 24px;
      border-radius: 28px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow-2);
    }

    .paper {
      min-height: 380px;
      border-radius: 20px;
      padding: 24px;
      border: 1px solid #dce4f2;
      background:
              linear-gradient(#e7ecf6 1px, transparent 1px),
              linear-gradient(90deg, #e7ecf6 1px, transparent 1px),
              #fff;
      background-size: 44px 44px;
    }

    .paper-head {
      display: flex;
      justify-content: space-between;
      gap: 10px;
      margin-bottom: 18px;
      color: var(--muted);
      font-size: 13px;
      font-weight: 800;
    }

    .chars {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-bottom: 14px;
    }

    .char {
      height: 96px;
      display: grid;
      place-items: center;
      border: 2px solid #86d9d1;
      border-radius: 6px;
      background:
              linear-gradient(45deg, transparent 49%, rgba(134, 217, 209, .45) 50%, transparent 51%),
              linear-gradient(-45deg, transparent 49%, rgba(134, 217, 209, .45) 50%, transparent 51%),
              linear-gradient(#86d9d1 0 0) center/100% 1px no-repeat,
              linear-gradient(90deg, #86d9d1 0 0) center/1px 100% no-repeat,
              #fbfffe;
      font-family: KaiTi, "STKaiti", "楷体", serif;
      font-size: 54px;
      color: rgba(9, 20, 90, .82);
    }

    .paper-note {
      margin-top: 22px;
      padding: 15px;
      border-radius: 14px;
      background: #e8fffb;
      border: 1px solid #bbefe8;
      color: #245f5a;
      font-size: 14px;
    }

    section {
      padding: 70px 0;
    }

    .section-title {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      gap: 20px;
      margin-bottom: 28px;
    }

    .section-title h2 {
      font-size: 42px;
      color: var(--blue);
    }

    .section-title p {
      max-width: 610px;
      margin: 10px 0 0;
      color: var(--muted);
    }

    .tool-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .tool {
      min-height: 208px;
      display: flex;
      flex-direction: column;
      padding: 23px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: var(--shadow);
      transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
    }

    .tool:hover {
      transform: translateY(-4px);
      border-color: #b9c7e3;
      box-shadow: var(--shadow-2);
    }

    .icon {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      margin-bottom: 18px;
      border-radius: 13px;
      background: var(--cyan-2);
      color: #087268;
      font-weight: 900;
      font-size: 18px;
    }

    .tool h3 {
      font-size: 19px;
      margin-bottom: 10px;
      color: var(--blue);
    }

    .tool p {
      margin: 0 0 16px;
      color: var(--muted);
      font-size: 14px;
    }

    .tool em {
      display: block;
      margin-top: 2px;
      color: #8993a8;
      font-style: normal;
      font-size: 12px;
    }

    .go {
      margin-top: auto;
      color: #05766d;
      font-size: 13px;
      font-weight: 900;
    }

    .dark {
      background: var(--blue);
      color: #fff;
    }

    .dark h2 {
      color: #cbd2ff;
    }

    .dark .section-title {
      display: block;
      text-align: center;
    }

    .dark .section-title p {
      margin-left: auto;
      margin-right: auto;
      color: #dce3ff;
    }

    .why-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
      margin-top: 38px;
      text-align: center;
    }

    .why {
      padding: 20px;
    }

    .why-icon {
      width: 72px;
      height: 72px;
      display: grid;
      place-items: center;
      margin: 0 auto 20px;
      border-radius: 50%;
      background: rgba(120, 229, 216, .12);
      border: 1px solid rgba(255, 255, 255, .22);
      color: var(--cyan);
      font-size: 28px;
      font-weight: 900;
    }

    .why h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: #fff;
    }

    .why p {
      margin: 0;
      color: #dce3ff;
      font-size: 14px;
    }

    .trust {
      background: #fff;
      border-block: 1px solid var(--line);
    }

    .trust-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 34px;
      align-items: stretch;
    }

    .trust-card,
    .en-card {
      padding: 32px;
      border-radius: 24px;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .trust-card {
      background:
              radial-gradient(circle at 100% 0%, rgba(120, 229, 216, .24), transparent 34%),
              #f7faff;
    }

    .trust-card h2,
    .en-card h2 {
      font-size: 38px;
      color: var(--blue);
      margin-bottom: 16px;
    }

    .trust-card p,
    .en-card p {
      color: var(--muted);
      margin: 0 0 18px;
    }

    .list {
      display: grid;
      gap: 12px;
      padding: 0;
      margin: 24px 0 0;
      list-style: none;
    }

    .list li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      color: #35405f;
    }

    .check {
      flex: 0 0 24px;
      width: 24px;
      height: 24px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: #dffff9;
      color: #087268;
      font-weight: 900;
    }

    .en-card {
      background: linear-gradient(135deg, #111b70, #2430a3);
      color: #fff;
      overflow: hidden;
      position: relative;
    }

    .en-card h2 {
      color: #fff;
    }

    .en-card p {
      color: #e2e7ff;
    }

    .badges {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin: 24px 0;
    }

    .badge {
      padding: 8px 12px;
      border-radius: 999px;
      background: rgba(255, 255, 255, .12);
      border: 1px solid rgba(255, 255, 255, .18);
      color: #fff;
      font-size: 13px;
      font-weight: 800;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 34px;
      align-items: start;
    }

    .faq-intro h2 {
      font-size: 42px;
      color: var(--blue);
      margin-bottom: 14px;
    }

    .faq-intro p {
      margin: 0 0 22px;
      color: var(--muted);
    }

    .sample {
      padding: 20px;
      border-radius: 22px;
      border: 1px solid var(--line);
      background:
              linear-gradient(#dce4f2 1px, transparent 1px),
              linear-gradient(90deg, #dce4f2 1px, transparent 1px),
              #fff;
      background-size: 34px 34px;
      box-shadow: var(--shadow);
    }

    .sample-row {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 8px;
    }

    .sample span {
      height: 56px;
      display: grid;
      place-items: center;
      border: 1px solid #86d9d1;
      background: rgba(255, 255, 255, .84);
      font-family: KaiTi, "STKaiti", "楷体", serif;
      font-size: 28px;
    }

    .faq-grid details {
      margin-bottom: 12px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #fff;
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .faq-grid summary {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      cursor: pointer;
      list-style: none;
      padding: 18px 20px;
      font-weight: 900;
    }

    .faq-grid summary::-webkit-details-marker {
      display: none;
    }

    .faq-grid summary::after {
      content: "+";
      flex: 0 0 24px;
      width: 24px;
      height: 24px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: #edf2fb;
    }

    .faq-grid details[open] summary::after {
      content: "−";
    }

    .faq-grid details p {
      margin: 0;
      padding: 0 20px 20px;
      color: var(--muted);
      font-size: 14px;
    }

    .cta {
      padding: 78px 0;
    }

    .cta-box {
      padding: 44px;
      border-radius: 28px;
      text-align: center;
      background:
              radial-gradient(circle at 12% 0%, rgba(255, 255, 255, .4), transparent 28%),
              linear-gradient(135deg, #7fe6dc, #9af0e8);
      box-shadow: var(--shadow-2);
    }

    .cta-box h2 {
      font-size: 46px;
      color: var(--blue);
      margin-bottom: 12px;
    }

    .cta-box p {
      max-width: 730px;
      margin: 0 auto 26px;
      color: #24535c;
    }

    footer {
      padding: 34px 0;
      border-top: 1px solid var(--line);
      background: #fff;
      color: var(--muted);
      font-size: 13px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-links a {
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    @media (max-width: 1000px) {
      .hero-grid,
      .trust-grid,
      .faq-grid {
        grid-template-columns: 1fr;
      }

      .tool-grid {
        grid-template-columns: repeat(3, 1fr);
      }

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

    @media (max-width: 760px) {
      .container {
        width: min(100% - 28px, 1180px);
      }

      .nav {
        padding: 14px 0;
      }

      .nav-links {
        display: none;
      }

      .nav-actions {
        margin-left: auto;
      }

      .language-switcher summary {
        min-height: 34px;
        padding: 0 12px;
        font-size: 13px;
      }

      .language-menu {
        width: min(300px, calc(100vw - 28px));
        max-height: calc(100vh - 100px);
        grid-template-columns: 1fr;
      }

      .top-btn {
        min-height: 34px;
        padding: 0 13px;
        font-size: 13px;
      }

      .hero {
        padding: 48px 0 44px;
      }

      h1 {
        font-size: 40px;
      }

      .section-title h2,
      .trust-card h2,
      .en-card h2,
      .faq-intro h2,
      .cta-box h2 {
        font-size: 32px;
      }

      .tool-grid,
      .why-grid {
        grid-template-columns: 1fr;
      }

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

      .char {
        height: 110px;
      }

      section {
        padding: 54px 0;
      }

      .cta-box {
        padding: 30px 18px;
      }
    }

    @media (max-width: 430px) {
      .stats {
        grid-template-columns: 1fr;
      }

      .btn {
        width: 100%;
      }
    }

    /* ===== Style fix patch: only adjust styles, no content changes ===== */

    .hero-grid > div > p:not(.hero-desc) {
      max-width: 720px;
      margin: 14px 0 0;
      color: var(--muted);
      font-size: 16px;
    }

    .brand-mark {
      min-width: 42px;
      width: 42px;
      padding: 0 4px;
      font-size: 13px;
      letter-spacing: -.04em;
      text-transform: none;
    }

    .trust-list {
      display: grid;
      gap: 12px;
      padding: 0;
      margin: 24px 0 0;
      list-style: none;
    }

    .trust-list li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      color: #35405f;
    }

    .quote-box {
      position: relative;
      min-height: 100%;
      padding: 32px;
      border-radius: 24px;
      background: linear-gradient(135deg, #111b70, #2430a3);
      color: #fff;
      border: 1px solid rgba(255, 255, 255, .08);
      box-shadow: var(--shadow-2);
      overflow: hidden;
    }

    .quote-box::before {
      content: "";
      position: absolute;
      right: -90px;
      bottom: -110px;
      width: 280px;
      height: 280px;
      border-radius: 50%;
      background: rgba(120, 229, 216, .20);
      pointer-events: none;
    }

    .quote-box h3,
    .quote-box p,
    .quote-box .badge-row,
    .quote-box .hero-actions {
      position: relative;
      z-index: 1;
    }

    .quote-box h3 {
      font-size: 38px;
      color: #fff;
      margin-bottom: 16px;
    }

    .quote-box p {
      margin: 0 0 18px;
      color: #e2e7ff;
    }

    .badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin: 24px 0;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 28px;
    }

    .btn-secondary {
      color: var(--blue);
      background: #fff;
      border-color: var(--line);
      box-shadow: var(--shadow);
    }

    .trust-card,
    .quote-box {
      min-height: 100%;
    }

    .faq-intro p + p {
      margin-top: -10px;
    }

    .sample-row {
      grid-template-rows: repeat(2, auto);
    }

    .tool-grid .tool {
      overflow: hidden;
    }

    .tool .icon {
      flex: 0 0 auto;
    }

    @media (max-width: 1000px) {
      .quote-box {
        min-height: auto;
      }
    }

    @media (max-width: 760px) {
      .brand {
        font-size: 15px;
      }

      .brand-mark {
        width: 38px;
        min-width: 38px;
        height: 38px;
        font-size: 12px;
      }

      .hero-grid {
        gap: 30px;
      }

      .preview {
        padding: 16px;
        border-radius: 22px;
      }

      .paper {
        min-height: auto;
        padding: 18px;
      }

      .paper-head {
        flex-direction: column;
        gap: 4px;
      }

      .stats {
        gap: 10px;
      }

      .stat {
        padding: 14px;
      }

      .tool {
        min-height: auto;
      }

      .trust-card,
      .quote-box {
        padding: 24px;
      }

      .quote-box h3 {
        font-size: 32px;
      }

      .sample-row {
        grid-template-columns: repeat(5, minmax(0, 1fr));
      }

      .sample span {
        height: 48px;
        font-size: 24px;
      }

      .footer-grid {
        align-items: flex-start;
      }
    }