@font-face {
      font-family: "Gangtu Tech";
      src: url("/fonts/gangtu-tech.woff2") format("woff2");
      font-style: normal;
      font-weight: 400;
      font-display: swap;
    }

    :root {
      --bg: #f9f8f8;
      --ink: #1e232c;
      --heading: #152443;
      --muted: #5f6673;
      --faint: #8a919c;
      --brand: #4d6bfe;
      --brand-dark: #3d56d9;
      --line: rgba(21, 36, 67, .09);
      --glass: rgba(255, 255, 255, .55);
      --glass-border: rgba(255, 255, 255, .9);
      --pill-border: rgba(9, 45, 78, .16);
      --max: 1080px;
    }

    * { box-sizing: border-box; }

    html {
      scroll-behavior: smooth;
      background: var(--bg);
    }

    body {
      margin: 0;
      color: var(--ink);
      background: var(--bg);
      font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC",
        "Noto Sans SC", "Segoe UI", sans-serif;
      font-size: 16px;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* ---------- 水墨晕染背景 ---------- */
    .wash {
      position: fixed;
      inset: 0;
      z-index: 0;
      overflow: hidden;
      pointer-events: none;
    }

    .blob {
      position: absolute;
      display: block;
      border-radius: 50%;
      opacity: .72;
      will-change: transform;
    }

    .blob-a {
      top: -16vw;
      left: -14vw;
      width: 62vw;
      height: 50vw;
      min-width: 460px;
      min-height: 360px;
      background: radial-gradient(circle at 42% 42%,
        rgba(77, 107, 254, .30),
        rgba(77, 107, 254, .12) 52%,
        rgba(77, 107, 254, 0) 74%);
      filter: blur(64px);
      animation: drift-a 30s ease-in-out infinite alternate;
    }

    .blob-b {
      top: 10vh;
      right: -14vw;
      width: 50vw;
      height: 42vw;
      min-width: 340px;
      min-height: 280px;
      background: radial-gradient(circle at 55% 45%,
        rgba(21, 36, 67, .20),
        rgba(21, 36, 67, .06) 55%,
        rgba(21, 36, 67, 0) 76%);
      filter: blur(78px);
      animation: drift-b 36s ease-in-out infinite alternate;
    }

    .blob-c {
      bottom: -26vw;
      left: 16vw;
      width: 68vw;
      height: 44vw;
      min-width: 420px;
      min-height: 300px;
      background: radial-gradient(circle at 50% 50%,
        rgba(77, 107, 254, .18),
        rgba(21, 36, 67, .06) 55%,
        rgba(21, 36, 67, 0) 78%);
      filter: blur(88px);
      animation: drift-c 42s ease-in-out infinite alternate;
    }

    @keyframes drift-a {
      from { transform: translate3d(0, 0, 0) scale(1); }
      to   { transform: translate3d(3vw, 2vh, 0) scale(1.05); }
    }

    @keyframes drift-b {
      from { transform: translate3d(0, 0, 0) scale(1.02); }
      to   { transform: translate3d(-2.5vw, 3vh, 0) scale(1); }
    }

    @keyframes drift-c {
      from { transform: translate3d(0, 0, 0) scale(1); }
      to   { transform: translate3d(-3vw, -2vh, 0) scale(1.06); }
    }

    a { color: inherit; }

    ::selection {
      background: rgba(77, 107, 254, .18);
      color: var(--heading);
    }

    :focus-visible {
      outline: 2px solid var(--brand);
      outline-offset: 4px;
      border-radius: 10px;
    }

    .skip {
      position: absolute;
      left: -9999px;
      top: 12px;
      padding: 10px 14px;
      color: #fff;
      background: var(--heading);
      border-radius: 10px;
      z-index: 100;
    }

    .skip:focus { left: 12px; }

    .wrap {
      position: relative;
      z-index: 1;
      width: 100%;
      max-width: var(--max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ---------- 导航 ---------- */
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      min-height: 76px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 15px;
      font-weight: 600;
      letter-spacing: .01em;
      text-decoration: none;
      white-space: nowrap;
    }

    .brand img {
      width: 30px;
      height: 30px;
      border-radius: 9px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 26px;
      font-size: 13.5px;
    }

    .nav-links a {
      color: rgba(30, 35, 44, .72);
      text-decoration: none;
      transition: color .18s ease;
    }

    .nav-links a:hover { color: var(--brand); }

    .nav-links a.nav-cta {
      padding: 7px 15px;
      color: var(--ink);
      border: 1px solid var(--pill-border);
      border-radius: 100px;
      background: rgba(255, 255, 255, .42);
      transition: background .18s ease, border-color .18s ease;
    }

    .nav-links a.nav-cta:hover {
      background: #fff;
      border-color: rgba(77, 107, 254, .45);
      color: var(--brand);
    }

    /* ---------- 首屏 ---------- */
    .hero {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 92px 0 84px;
      text-align: center;
    }

    .announce {
      margin: 0 0 30px;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.7;
    }

    .announce a {
      color: var(--brand);
      text-decoration: none;
      white-space: nowrap;
    }

    .announce a:hover { text-decoration: underline; }

    h1 {
      margin: 0;
      color: var(--heading);
      font-size: clamp(32px, 4.2vw, 48px);
      font-weight: 400;
      line-height: 1.55;
      letter-spacing: .18em;
    }

    .hero h1 {
      font-size: clamp(36px, 4.8vw, 56px);
      font-weight: 600;
      line-height: 1.28;
      letter-spacing: .005em;
    }

    .hero-title-intro {
      display: block;
      margin-bottom: .25em;
      font-size: .74em;
      font-weight: 400;
      line-height: 1.4;
      letter-spacing: .035em;
    }

    .hero-title-main {
      display: block;
      padding-bottom: .24em;
      white-space: nowrap;
    }

    .hero-title-route {
      position: relative;
      display: inline-block;
      color: #315bc0;
      font-weight: 700;
      line-height: 1.2;
    }

    .hero-title-track {
      position: absolute;
      right: 0;
      bottom: -.2em;
      width: 100%;
      height: .32em;
      pointer-events: none;
    }

    .lead {
      max-width: 560px;
      margin: 22px auto 42px;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.9;
    }

    .hero .lead { line-height: 1.85; }

    /* ---------- 大号输入框 ---------- */
    .ask {
      display: block;
      width: 100%;
      max-width: 880px;
      margin: 0 auto;
      padding: 20px 18px 12px 24px;
      text-align: left;
      text-decoration: none;
      background: var(--glass);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      box-shadow: 0 1px 2px rgba(21, 36, 67, .03), 0 20px 50px rgba(21, 36, 67, .06);
      transition: background .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease;
    }

    .ask:hover {
      background: rgba(255, 255, 255, .78);
      border-color: rgba(77, 107, 254, .28);
      box-shadow: 0 1px 2px rgba(21, 36, 67, .03), 0 24px 60px rgba(21, 36, 67, .09);
      transform: translateY(-1px);
    }

    .ask-text {
      display: block;
      min-height: 58px;
      padding: 8px 4px 20px;
      color: var(--faint);
      font-size: 16px;
      line-height: 1.6;
    }

    .ask-tools {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .tags span {
      padding: 3px 10px;
      color: var(--muted);
      background: rgba(21, 36, 67, .045);
      border-radius: 100px;
      font-size: 12px;
      line-height: 1.6;
    }

    .send {
      display: grid;
      place-items: center;
      flex: none;
      width: 44px;
      height: 44px;
      color: #fff;
      background: var(--brand);
      border-radius: 50%;
      transition: background .18s ease, transform .18s ease;
    }

    .ask:hover .send {
      background: var(--brand-dark);
      transform: translateX(2px);
    }

    .send svg { width: 20px; height: 20px; }

    /* ---------- 胶囊按钮 ---------- */
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
      margin-top: 28px;
    }

    .pill {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 10px 18px;
      color: var(--ink);
      text-decoration: none;
      background: rgba(255, 255, 255, .4);
      border: 1px solid var(--pill-border);
      border-radius: 100px;
      font-size: 14px;
      line-height: 1.4;
      transition: background .18s ease, border-color .18s ease, color .18s ease;
    }

    .pill:hover {
      color: var(--brand);
      background: #fff;
      border-color: rgba(77, 107, 254, .4);
    }

    .pill.primary { color: var(--brand); }

    /* ---------- 区块 ---------- */
    .section {
      padding: 88px 0 0;
    }

    .section-top {
      border-top: 1px solid var(--line);
      padding-top: 34px;
    }

    .eyebrow {
      margin: 0 0 14px;
      color: var(--brand);
      font-size: 12px;
      font-weight: 500;
      letter-spacing: .16em;
    }

    h2 {
      max-width: 720px;
      margin: 0 0 16px;
      color: var(--heading);
      font-size: clamp(24px, 2.6vw, 30px);
      font-weight: 500;
      line-height: 1.45;
      letter-spacing: .01em;
    }

    .section-sub {
      max-width: 620px;
      margin: 0;
      color: var(--muted);
      font-size: 14.5px;
      line-height: 1.9;
    }

    /* ---------- 核心能力 ---------- */
    .features {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0 48px;
      margin-top: 42px;
    }

    .feature {
      padding: 24px 0 30px;
      border-top: 1px solid var(--line);
    }

    .idx {
      display: block;
      margin-bottom: 12px;
      color: var(--brand);
      font-size: 11.5px;
      font-weight: 500;
      letter-spacing: .12em;
    }

    .feature h3 {
      margin: 0 0 8px;
      color: var(--heading);
      font-size: 16px;
      font-weight: 600;
    }

    .feature p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.85;
    }

    /* ---------- 适用对象 ---------- */
    .audience {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 64px;
      margin-top: 8px;
    }

    .audience h2 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    .audience p {
      margin: 0;
      color: var(--muted);
      font-size: 14.5px;
      line-height: 1.9;
    }

    /* ---------- 联系我们 ---------- */
    #contact { padding-top: 26px; }

    #contact .eyebrow {
      margin-bottom: 8px;
      font-size: 11px;
      letter-spacing: .12em;
    }

    #contact h2 {
      font-size: 20px;
      line-height: 1.5;
    }

    .contact-head {
      display: flex;
      flex-wrap: wrap;
      align-items: flex-end;
      justify-content: space-between;
      gap: 10px 24px;
    }

    .contact-head h2 { margin-bottom: 0; }

    .contact-note {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.8;
    }

    .people {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0 40px;
      margin-top: 18px;
    }

    .person {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 14px;
      padding: 13px 0;
      border-top: 1px solid var(--line);
      text-decoration: none;
      transition: color .18s ease;
    }

    .person:hover { color: var(--brand); }

    .person strong {
      color: var(--heading);
      font-size: 14px;
      font-weight: 600;
    }

    .person:hover strong { color: var(--brand); }

    .person small {
      color: var(--muted);
      font-size: 12.5px;
      overflow-wrap: anywhere;
    }

    /* ---------- 页脚 ---------- */
    footer {
      margin-top: 88px;
      padding: 26px 0 42px;
      border-top: 1px solid var(--line);
      color: var(--faint);
      font-size: 12.5px;
    }

    .footer-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 12px 24px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-links a {
      text-decoration: none;
      transition: color .18s ease;
    }

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

    /* ---------- 入场 ---------- */
    @keyframes rise {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .hero > * {
      animation: rise .5s ease both;
    }

    .hero > :nth-child(2) { animation-delay: .04s; }
    .hero > :nth-child(3) { animation-delay: .08s; }
    .hero > :nth-child(4) { animation-delay: .12s; }
    .hero > :nth-child(5) { animation-delay: .16s; }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after {
        animation: none !important;
        transition: none !important;
      }
    }

    /* ---------- 响应式 ---------- */
    @media (max-width: 860px) {
      .features { grid-template-columns: repeat(2, 1fr); }
      .audience { grid-template-columns: 1fr; gap: 40px; }
      .people { grid-template-columns: 1fr; gap: 0; }
    }

    @media (max-width: 640px) {
      .wrap { padding: 0 18px; }

      .blob { opacity: .58; filter: blur(52px); }
      .blob-a { width: 92vw; height: 76vw; left: -36vw; top: -10vw; }
      .blob-b { width: 78vw; height: 66vw; right: -30vw; top: 16vh; }
      .blob-c { width: 100vw; height: 72vw; left: -6vw; bottom: -24vw; }

      .nav { min-height: 64px; }
      .nav-links { gap: 14px; }
      .nav-links a.opt { display: none; }

      .hero { padding: 64px 0 64px; }

      h1 {
        font-size: 32px;
        line-height: 1.6;
        letter-spacing: .12em;
      }

      .hero h1 {
        font-size: 32px;
        line-height: 1.3;
        letter-spacing: .01em;
      }

      .lead {
        margin: 18px auto 32px;
        font-size: 14px;
      }

      .announce { margin-bottom: 24px; font-size: 12.5px; }

      .ask { padding: 16px 14px 10px 18px; border-radius: 20px; }
      .ask-text { min-height: 52px; font-size: 14.5px; }
      .tags span { font-size: 11.5px; }
      .send { width: 40px; height: 40px; }

      .features { grid-template-columns: 1fr; gap: 0; margin-top: 32px; }
      .feature { padding: 20px 0 24px; }

      .section { padding-top: 68px; }
      .section-top { padding-top: 28px; }

      footer { margin-top: 64px; }
    }

    /* ---------- 内页 ---------- */
    .page-hero {
      padding: 86px 0 10px;
      text-align: center;
    }

    .page-hero h1 {
      max-width: 860px;
      margin: 0 auto;
      font-size: clamp(30px, 3.6vw, 44px);
      line-height: 1.45;
      letter-spacing: .08em;
    }

    .page-hero .lead {
      max-width: 640px;
      margin: 18px auto 0;
    }

    .page-hero > * {
      animation: rise .5s ease both;
    }

    .page-hero > :nth-child(2) { animation-delay: .04s; }
    .page-hero > :nth-child(3) { animation-delay: .08s; }

    .page-actions {
      justify-content: flex-start;
      margin-top: 0;
    }

    @media (max-width: 640px) {
      .page-hero { padding-top: 58px; }

      .page-hero h1 {
        font-size: 28px;
        letter-spacing: .06em;
      }
    }

    /* ---------- 使用教程 ---------- */
    .table-wrap {
      margin-top: 26px;
      overflow-x: auto;
      border-top: 1px solid var(--line);
    }

    .account-table {
      width: 100%;
      min-width: 640px;
      border-collapse: collapse;
      font-size: 14px;
    }

    .account-table th,
    .account-table td {
      padding: 16px 18px 16px 0;
      border-bottom: 1px solid var(--line);
      text-align: left;
      vertical-align: top;
    }

    .account-table th {
      color: var(--muted);
      font-size: 12.5px;
      font-weight: 500;
      letter-spacing: .04em;
    }

    .account-table td { color: var(--muted); }

    .account-table td:first-child {
      color: var(--heading);
      font-weight: 600;
    }

    .account-table code {
      padding: 2px 6px;
      border-radius: 6px;
      background: rgba(21, 36, 67, .05);
      color: var(--heading);
      font-size: 13px;
    }

    .table-note {
      margin-top: 14px;
      color: var(--faint);
      font-size: 13px;
      line-height: 1.8;
    }

    .note {
      margin-top: 16px;
      padding: 14px 16px;
      border: 1px solid rgba(77, 107, 254, .16);
      border-radius: 12px;
      background: rgba(77, 107, 254, .04);
      color: var(--muted);
      font-size: 13.5px;
      line-height: 1.8;
    }

    .note strong { color: var(--heading); }

    .faq {
      margin-top: 26px;
      border-top: 1px solid var(--line);
    }

    .faq details {
      padding: 16px 0;
      border-bottom: 1px solid var(--line);
    }

    .faq summary {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 16px;
      color: var(--heading);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      list-style: none;
    }

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

    .faq summary::after {
      content: "+";
      color: var(--brand);
      font-size: 18px;
      font-weight: 400;
      line-height: 1;
    }

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

    .faq p {
      margin: 10px 0 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.9;
    }

    .feature code,
    .faq code,
    .table-note code {
      padding: 2px 6px;
      border-radius: 6px;
      background: rgba(21, 36, 67, .05);
      color: var(--heading);
      font-size: .92em;
    }

    .table-note a {
      color: var(--brand);
      text-decoration: none;
    }

    .table-note a:hover { text-decoration: underline; }

    /* 科技艺术字海报：沿用原有居中布局、输入框宽度和按钮位置。 */
    .tech-poster-page {
      --bg: #f8faff;
      --heading: #162b4b;
      --muted: #5e6c81;
    }

    .tech-poster-page .wash {
      background:
        radial-gradient(ellipse at 50% 22%, rgba(66, 99, 235, .09), transparent 62%),
        linear-gradient(#fcfdff, #f7f9fd);
    }

    .tech-poster-page .wash::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(49, 91, 192, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(49, 91, 192, .035) 1px, transparent 1px);
      background-size: 56px 56px;
      background-position: center top;
      mask-image: linear-gradient(transparent 40px, #000 180px, transparent 720px);
      pointer-events: none;
    }

    .tech-poster-page .blob { display: none; }

    .tech-poster-page .hero h1 {
      max-width: 100%;
      font-family: "Gangtu Tech", "Microsoft YaHei UI", "PingFang SC", sans-serif;
      font-size: clamp(38px, 5.8vw, 68px);
      font-weight: 400;
      font-synthesis: none;
      line-height: 1.2;
      letter-spacing: .015em;
      text-align: center;
    }

    .tech-poster-page .hero-title-intro {
      margin: 0 0 .1em;
      font-size: .82em;
      font-weight: 400;
      line-height: 1.2;
      letter-spacing: .015em;
    }

    .tech-poster-page .hero-title-main {
      margin-inline: 0;
      padding-bottom: .18em;
      line-height: 1.2;
      text-align: center;
    }

    .tech-poster-page .hero-title-route { color: #315bc0; font-weight: 400; }
    .tech-poster-page .hero-title-track { right: 0; bottom: -.22em; width: 100%; height: .25em; }
    .tech-poster-page .hero > * { animation: none; }

    @media (max-width: 640px) {
      .tech-poster-page .hero h1 { font-size: clamp(30px, 9.6vw, 36px); }
    }