:root {
      --white: #ffffff;
      --black: #181818;
      --gray-1: #4f4f4f;
      --gray-2: #777777;
      --gray-3: #a5a5a5;
      --gray-4: #dcdcdc;
      --gray-5: #eeeeee;
      --gray-6: #f7f7f7;

      --accent: #8a6f52;
      --accent-strong: #6e573f;
      --accent-soft: #f3ede5;

      --max-width: 1060px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: auto;
    }

    body {
      background: var(--white);
      color: var(--black);

      font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "PingFang SC",
        "Hiragino Sans GB",
        "Microsoft YaHei",
        Arial,
        sans-serif;

      font-size: 15px;
      line-height: 1.8;

      -webkit-font-smoothing: antialiased;

      padding-top: 4.5rem;
    }

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

    .container {
      width: min(calc(100% - 48px), var(--max-width));
      margin: 0 auto;
    }

    .hero {
      padding: 16px 0 48px;
    }

    .hero h1 {
      max-width: 760px;

      font-size: clamp(38px, 5.6vw, 58px);
      line-height: 1.24;

      font-weight: 600;
      letter-spacing: -0.04em;

      margin-bottom: 22px;
    }

    .hero-text {
      max-width: 580px;

      color: var(--gray-1);

      font-size: 15px;
      line-height: 1.95;

      margin-bottom: 32px;
    }

    .buttons {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;

      height: 44px;
      min-width: 118px;

      padding: 0 20px;

      border: 1px solid var(--gray-4);
      border-radius: 8px;

      background: var(--white);

      font-size: 13px;

      transition:
        background 0.15s ease,
        border-color 0.15s ease,
        transform 0.15s ease,
        box-shadow 0.15s ease;
    }

    .button:hover {
      background: var(--gray-6);
      border-color: #c8c8c8;
    }

    .button-dark {
      background: var(--accent);
      border-color: var(--accent);
      color: var(--white);
    }

    .button-dark:hover {
      background: var(--accent-strong);
      border-color: var(--accent-strong);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(110, 87, 63, 0.25);
    }

    .dl-button {
      --main-focus: #2d8cf0;
      --font-color: #181818;
      --bg-color-sub: #dedede;
      --bg-color: #f2f1ee;
      --main-color: #181818;

      position: relative;

      width: 150px;
      height: 46px;

      display: inline-flex;
      align-items: center;

      border: 2px solid var(--main-color);
      border-radius: 10px;
      box-shadow: 4px 4px var(--main-color);
      background: var(--bg-color);

      overflow: hidden;

      cursor: pointer;

      transition: all 0.3s;
    }

    .dl-button .dl-text {
      transform: translateX(22px);

      color: var(--font-color);
      font-size: 14px;
      font-weight: 600;

      transition: all 0.3s;
    }

    .dl-button .dl-icon {
      position: absolute;
      transform: translateX(109px);

      height: 100%;
      width: 39px;

      background: var(--bg-color-sub);

      display: flex;
      align-items: center;
      justify-content: center;

      transition: all 0.3s;
    }

    .dl-button .dl-icon svg {
      width: 20px;
      height: 20px;

      stroke: var(--main-color);
      fill: none;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .dl-button:hover .dl-text {
      color: transparent;
    }

    .dl-button:hover .dl-icon {
      width: 146px;
      transform: translateX(0);
    }

    .dl-button:active {
      transform: translate(3px, 3px);
      box-shadow: 0 0 var(--main-color);
    }

    .dl-button:focus-visible {
      outline: 2px solid var(--main-focus);
      outline-offset: 2px;
    }

    .cards {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;

      padding-bottom: 72px;
    }

    .card {
      background: var(--white);
      border: 1px solid var(--gray-4);
      border-radius: 10px;
      padding: 22px 24px 20px;
      pointer-events: none;
      -webkit-tap-highlight-color: transparent;
    }

    .card-title::before {
      content: "";
      display: block;

      width: 26px;
      height: 2px;

      background: var(--accent);

      margin-bottom: 12px;
    }

    .card-title {
      font-size: 15px;
      font-weight: 600;
      letter-spacing: 0.01em;

      margin-bottom: 7px;
    }

    .card-text {
      color: var(--gray-1);
      font-size: 13px;
      line-height: 1.85;
    }

    .updates {
      border-top: 1px solid var(--gray-4);

      padding: 54px 0 78px;
    }

    .heading {
      display: flex;
      align-items: baseline;
      gap: 16px;

      margin-bottom: 20px;
    }

    .heading-number {
      color: var(--accent);
      font-size: 12px;
    }

    .heading-title {
      font-size: 16px;
      font-weight: 600;
    }

    .update-list {
      border-top: 1px solid var(--gray-4);
    }

    .update {
      display: grid;

      grid-template-columns: 110px 1fr;

      gap: 25px;

      padding: 15px 0;

      border-bottom: 1px solid var(--gray-4);
    }

    .update-date {
      color: var(--gray-3);
      font-size: 12px;
    }

    .update-content {
      font-size: 13.5px;
    }

    .footer {
      border-top: 1px solid var(--gray-4);

      padding: 28px 0 32px;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;

      color: var(--gray-3);
      font-size: 12px;
      text-align: center;
    }

    .footer-links {
      display: flex;
      gap: 18px;
    }

    .footer-links a {
      transition: color 0.15s ease;
    }

    .footer-links a:hover {
      color: var(--accent-strong);
    }

    /* 备案信息 */
    .footer-beian {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 6px;
      font-size: 12px;
      color: #67676c;
      font-family: "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
    }
    .footer-beian a { color: #67676c; text-decoration: none; }
    .footer-beian a:hover { color: #3451b2; text-decoration: underline; }
    .beian-ico { height: 18px; vertical-align: middle; display: inline-block; }
    .beian-sep { width: 1px; height: 12px; background: #b0b0b0; display: inline-block; margin: 0 8px; vertical-align: middle; }
    html.dark .footer-beian, html.dark .footer-beian a { color: #98989f; }
    html.dark .footer-beian a:hover { color: #a8b1ff; }

    @media (max-width: 760px) {
      body {
        padding-top: 4.25rem;
      }

      .container {
        width: min(calc(100% - 32px), var(--max-width));
      }

      .hero {
        padding: 12px 0 44px;
      }

      .hero h1 {
        font-size: 38px;
      }

      .cards {
        grid-template-columns: 1fr;

        padding-bottom: 56px;
      }

      .updates {
        padding: 44px 0 60px;
      }
    }

    @media (max-width: 500px) {
      .hero h1 {
        font-size: 34px;
      }

      .hero-text {
        font-size: 14px;
      }

      .buttons {
        flex-direction: column;
        align-items: stretch;
      }

      .button {
        width: 100%;
      }

      .buttons .dl-button {
        align-self: center;
      }

      .update {
        grid-template-columns: 82px 1fr;

        gap: 16px;
      }

      .footer-inner {
        flex-direction: column;
        align-items: center;
      }

      .footer-beian {
        font-size: 11px;
      }
    }
      html.dark {
      --white: #14161a;
      --black: #e9e6df;
      --gray-1: #b9b6ae;
      --gray-2: #8f8c84;
      --gray-3: #6f6d66;
      --gray-4: #2e323a;
      --gray-5: #262a31;
      --gray-6: #1d2127;
      --accent: #a8896a;
      --accent-strong: #c09a76;
      --accent-soft: #26221c;
    }

    html.dark .dl-button {
      --font-color: #eae7e0;
      --bg-color: #252a31;
      --bg-color-sub: #333a44;
      --main-color: #4b5560;

      box-shadow: 4px 4px rgba(0, 0, 0, 0.5);
    }

    html.dark .dl-button .dl-icon svg {
      stroke: #dbe1e8;
    }

    html.dark .dl-button:active {
      box-shadow: 0 0 rgba(0, 0, 0, 0.45);
    }

    .hero h1 span {
      display: inline-block;

      animation: hqCharIn 0.42s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    }

    .hero-text,
    .buttons .dl-button,
    .cards .card,
    .updates .heading,
    .update-list {
      animation: hqRiseIn 0.42s cubic-bezier(0.25, 1, 0.5, 1) both;
    }

    .hero h1 span:nth-child(1) { animation-delay: 0.04s; }
    .hero h1 span:nth-child(2) { animation-delay: 0.10s; }
    .hero h1 span:nth-child(3) { animation-delay: 0.16s; }
    .hero h1 span:nth-child(4) { animation-delay: 0.22s; }
    .hero h1 span:nth-child(5) { animation-delay: 0.28s; }
    .hero h1 span:nth-child(6) { animation-delay: 0.34s; }

    .hero-text { animation-delay: 0.16s; }
    .buttons .dl-button:nth-child(1) { animation-delay: 0.20s; }
    .buttons .dl-button:nth-child(2) { animation-delay: 0.24s; }
    .cards .card:nth-child(1) { animation-delay: 0.28s; }
    .cards .card:nth-child(2) { animation-delay: 0.32s; }
    .updates .heading { animation-delay: 0.36s; }
    .update-list { animation-delay: 0.40s; }

    html.hq-nav .hero h1 span:nth-child(1) { animation-delay: 0s; }
    html.hq-nav .hero h1 span:nth-child(2) { animation-delay: 0.05s; }
    html.hq-nav .hero h1 span:nth-child(3) { animation-delay: 0.10s; }
    html.hq-nav .hero h1 span:nth-child(4) { animation-delay: 0.15s; }
    html.hq-nav .hero h1 span:nth-child(5) { animation-delay: 0.20s; }
    html.hq-nav .hero h1 span:nth-child(6) { animation-delay: 0.25s; }
    html.hq-nav .hero-text { animation-delay: 0.10s; }
    html.hq-nav .buttons .dl-button:nth-child(1) { animation-delay: 0.12s; }
    html.hq-nav .buttons .dl-button:nth-child(2) { animation-delay: 0.15s; }
    html.hq-nav .cards .card:nth-child(1) { animation-delay: 0.18s; }
    html.hq-nav .cards .card:nth-child(2) { animation-delay: 0.21s; }
    html.hq-nav .updates .heading { animation-delay: 0.24s; }
    html.hq-nav .update-list { animation-delay: 0.27s; }

    @keyframes hqCharIn {
      from {
        opacity: 0.3;
        transform: translate3d(0, 26px, 0);
      }

      to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
      }
    }

    @keyframes hqRiseIn {
      from {
        opacity: 0.45;
        transform: translate3d(0, 14px, 0);
      }

      to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
      }
    }

    @media (prefers-reduced-motion: reduce) {
      .hero h1 span,
      .hero-text,
      .buttons .dl-button,
      .cards .card,
      .updates .heading,
      .update-list {
        animation: none;
      }
    }