:root {
      --blue-900: #1716a4;
      --blue-800: #2326c5;
      --violet: #6137ee;
      --violet-2: #7c5cff;
      --gold: #ffd21f;
      --gold-2: #ffbe17;
      --ink: #151c45;
      --muted: #5c6387;
      --soft: #f5f7ff;
      --line: #dfe3f5;
      --white: #fff;
      --shadow: 0 22px 60px rgba(30, 33, 120, .14);
      --radius: 8px;
      --container: 1760px;
    }

    * { box-sizing: border-box; }
    html {
      scroll-behavior: smooth;
      overflow-x: hidden;
    }
    body {
      margin: 0;
      background: #f7f8ff;
      color: var(--ink);
      font-family: Inter, "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      overflow-x: hidden;
    }
    body.menu-open { overflow: hidden; }
    a { color: inherit; text-decoration: none; }
    button { border: 0; font: inherit; cursor: pointer; }

    .shell {
      width: min(100%, var(--container));
      margin: 0 auto;
      padding: 0 clamp(24px, 4.8vw, 96px);
    }

    .hero-wrap {
      padding: 10px;
    }

    .hero-panel {
      position: relative;
      min-height: clamp(660px, 42vw, 860px);
      overflow: hidden;
      border-radius: 22px;
      background:
        radial-gradient(circle at 80% 40%, rgba(124, 92, 255, .65), transparent 28%),
        radial-gradient(circle at 18% 75%, rgba(255, 255, 255, .13), transparent 28%),
        linear-gradient(135deg, #1716a4 0%, #2b2ad2 52%, #4628c8 100%);
      color: #fff;
      box-shadow: 0 30px 90px rgba(36, 28, 190, .22);
    }

    .hero-panel::after {
      position: absolute;
      right: clamp(-170px, -6vw, -70px);
      bottom: clamp(-210px, -9vw, -130px);
      width: clamp(760px, 48vw, 1080px);
      height: clamp(760px, 48vw, 1080px);
      border: clamp(76px, 5.4vw, 124px) solid rgba(255, 255, 255, .08);
      border-radius: 999px;
      content: "";
    }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 30;
      padding: 22px clamp(26px, 4.8vw, 80px) 0;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 26px;
      min-height: 54px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      min-width: max-content;
      color: #fff;
      font-weight: 900;
      font-size: 24px;
      letter-spacing: 0;
    }

    .brand.small {
      color: #fff;
      font-size: 18px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      flex: 0 0 auto;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 34px;
      color: rgba(255, 255, 255, .9);
      font-size: 14px;
      font-weight: 800;
    }

    .nav-links a {
      position: relative;
      padding: 10px 0;
    }

    .nav-links a::after {
      position: absolute;
      right: 0;
      bottom: 1px;
      left: 0;
      height: 3px;
      border-radius: 999px;
      background: #fff;
      content: "";
      opacity: 0;
      transform: scaleX(.25);
      transition: .18s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      opacity: 1;
      transform: scaleX(1);
    }

    .btn {
      display: inline-flex;
      min-height: 46px;
      align-items: center;
      justify-content: center;
      gap: 10px;
      border-radius: var(--radius);
      padding: 12px 24px;
      font-weight: 900;
      transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
      white-space: nowrap;
    }

    .btn:active { transform: scale(.97); }
    .btn-glass {
      border: 1px solid rgba(255, 255, 255, .24);
      background: rgba(255, 255, 255, .16);
      color: #fff;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18);
    }
    .btn-purple {
      background: linear-gradient(135deg, var(--violet-2), var(--violet));
      color: #fff;
      box-shadow: 0 14px 30px rgba(91, 57, 231, .28);
    }
    .btn-yellow {
      background: linear-gradient(135deg, var(--gold), var(--gold-2));
      color: #312200;
      box-shadow: 0 14px 30px rgba(255, 197, 28, .28);
    }
    .btn-light {
      background: #eef1ff;
      color: var(--blue-800);
    }

    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: var(--radius);
      background: rgba(255, 255, 255, .15);
      color: #fff;
    }

    .hero {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(580px, .88fr) minmax(760px, 1.12fr);
      gap: clamp(56px, 7.6vw, 150px);
      align-items: center;
      min-height: clamp(580px, 38vw, 760px);
      padding: clamp(58px, 5.4vw, 96px) clamp(16px, 2.4vw, 30px) clamp(82px, 6.4vw, 118px);
    }

    .hero > * {
      min-width: 0;
    }

    .pill {
      display: inline-flex;
      align-items: center;
      border-radius: 999px;
      background: rgba(255, 255, 255, .16);
      padding: 10px 18px;
      color: rgba(255, 255, 255, .94);
      font-weight: 800;
    }

    h1, h2, h3, h4, p { margin: 0; }
    h1 {
      margin-top: 22px;
      font-family: "Noto Sans SC", sans-serif;
      font-size: clamp(64px, 5.7vw, 118px);
      font-weight: 900;
      line-height: 1.05;
      letter-spacing: .01em;
    }
    .hero-sub {
      margin-top: 12px;
      font-size: clamp(28px, 2.35vw, 48px);
      font-weight: 900;
      letter-spacing: .02em;
      white-space: nowrap;
    }
    .hero-copy {
      max-width: 820px;
      margin-top: 26px;
      color: rgba(255, 255, 255, .82);
      font-size: clamp(18px, 1.08vw, 23px);
      line-height: 1.9;
      font-weight: 600;
    }

    .hero-points {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: clamp(18px, 2vw, 34px);
      max-width: 790px;
      margin-top: clamp(46px, 4vw, 70px);
    }

    .point {
      display: grid;
      gap: 10px;
      justify-items: center;
      color: rgba(255, 255, 255, .88);
      font-size: 13px;
      font-weight: 800;
      text-align: center;
    }

    .point-icon {
      display: grid;
      place-items: center;
      width: 40px;
      height: 40px;
      border: 1px solid rgba(255, 255, 255, .28);
      border-radius: 999px;
      background: rgba(255, 255, 255, .1);
    }

    .visual {
      position: relative;
      min-height: clamp(560px, 35vw, 720px);
    }

    .laptop {
      position: absolute;
      top: clamp(46px, 4.2vw, 92px);
      right: clamp(120px, 8.8vw, 220px);
      width: clamp(620px, 37vw, 860px);
      border-radius: 18px;
      background: #e9edff;
      box-shadow: 0 30px 90px rgba(0, 0, 0, .26);
      transform: rotate(-5deg);
      overflow: hidden;
    }

    .screenbar {
      height: 28px;
      background: #fff;
      border-bottom: 1px solid #dce2ff;
    }

    .ui-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 12px;
      padding: 16px;
    }

    .ui-list, .ui-side {
      display: grid;
      gap: 9px;
    }

    .ui-row {
      height: 30px;
      border-radius: 6px;
      background: #fff;
      box-shadow: inset 0 0 0 1px rgba(81, 87, 178, .08);
    }

    .ui-row:nth-child(2n) { background: #f5f7ff; }

    .phone {
      position: absolute;
      top: clamp(82px, 6.2vw, 132px);
      right: clamp(0px, .8vw, 28px);
      width: clamp(160px, 9.8vw, 218px);
      height: clamp(330px, 20vw, 454px);
      border: 8px solid #fff;
      border-radius: 24px;
      background: #f4f6ff;
      box-shadow: 0 20px 55px rgba(0, 0, 0, .24);
      overflow: hidden;
    }

    .phone .ui-row {
      height: 24px;
      margin: 10px;
    }

    .bot {
      position: absolute;
      right: clamp(500px, 29vw, 680px);
      bottom: clamp(4px, 1.2vw, 24px);
      width: clamp(220px, 13.6vw, 304px);
      height: clamp(220px, 13.6vw, 304px);
      border-radius: 50%;
      filter: drop-shadow(0 25px 35px rgba(8, 14, 81, .28));
    }

    .float-app {
      position: absolute;
      right: clamp(0px, .6vw, 22px);
      display: grid;
      place-items: center;
      width: clamp(62px, 4vw, 84px);
      height: clamp(62px, 4vw, 84px);
      border-radius: 16px;
      background: #fff;
      box-shadow: var(--shadow);
    }

    .float-app.wechat { top: clamp(104px, 7vw, 146px); background: #18c25b; }
    .float-app.monitor { top: clamp(196px, 12vw, 266px); }

    .section {
      padding: clamp(76px, 7vw, 124px) 0;
    }

    .section-title {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 22px;
      margin-bottom: 36px;
      color: var(--blue-800);
      text-align: center;
      font-size: clamp(28px, 4vw, 38px);
      font-weight: 900;
    }

    .slashes {
      color: var(--violet-2);
      font-weight: 900;
      letter-spacing: 5px;
    }

    .cards {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: clamp(32px, 2.6vw, 56px);
    }

    .card, .trust-strip, .qr-band {
      border: 1px solid rgba(196, 203, 236, .82);
      border-radius: var(--radius);
      background: rgba(255, 255, 255, .92);
      box-shadow: var(--shadow);
    }

    .card {
      padding: clamp(30px, 2.1vw, 44px);
      min-height: clamp(590px, 34vw, 700px);
      display: flex;
      flex-direction: column;
    }

    .app-icon {
      display: grid;
      place-items: center;
      width: 72px;
      height: 72px;
      border-radius: 19px;
      margin-bottom: 18px;
      box-shadow: 0 14px 28px rgba(31, 27, 150, .16);
      overflow: hidden;
    }
    .app-icon img,
    .float-app img {
      display: block;
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .product-kicker {
      color: var(--blue-800);
      font-weight: 900;
      font-size: 17px;
    }

    .card h3 {
      color: #11194f;
      font-size: 25px;
      font-weight: 900;
      line-height: 1.18;
    }

    .card p {
      margin-top: 16px;
      color: var(--muted);
      line-height: 1.8;
      font-weight: 600;
    }

    .list {
      display: grid;
      gap: 10px;
      padding: 0;
      margin: 20px 0 24px;
      list-style: none;
      color: #273066;
      font-size: 14px;
      font-weight: 700;
    }

    .list li {
      display: flex;
      align-items: center;
      gap: 9px;
    }

    .check {
      width: 17px;
      height: 17px;
      flex: 0 0 auto;
      color: var(--violet);
    }

    .info-box {
      display: grid;
      gap: 12px;
      margin-top: auto;
      border-top: 1px solid var(--line);
      padding-top: 18px;
    }

    .info-row {
      display: grid;
      grid-template-columns: 74px 1fr;
      gap: 12px;
      align-items: start;
      color: var(--muted);
      font-size: 13px;
      font-weight: 600;
      line-height: 1.55;
    }

    .info-row strong {
      color: var(--blue-800);
      font-size: 13px;
      font-weight: 900;
    }

    .loop-panel {
      position: relative;
      border: 2px solid rgba(79, 104, 225, .18);
      border-radius: 22px;
      background:
        linear-gradient(#fff, #fff) padding-box,
        linear-gradient(135deg, rgba(99, 76, 255, .5), rgba(34, 72, 214, .18)) border-box;
      box-shadow: 0 28px 74px rgba(30, 33, 120, .12);
      padding: 42px 28px 30px;
      overflow: hidden;
    }

    .loop-panel::before {
      position: absolute;
      inset: 0;
      background:
        radial-gradient(circle at 12% 18%, rgba(96, 69, 238, .08), transparent 26%),
        radial-gradient(circle at 84% 82%, rgba(37, 89, 229, .08), transparent 30%);
      content: "";
      pointer-events: none;
    }

    .loop-row {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: repeat(5, minmax(120px, 1fr));
      gap: 34px;
      align-items: center;
      min-height: 122px;
      border: 1px solid rgba(205, 213, 246, .8);
      border-radius: 16px;
      background: rgba(255, 255, 255, .82);
      padding: 24px 26px;
    }

    .loop-row + .loop-row {
      margin-top: 18px;
    }

    .loop-step {
      position: relative;
      display: grid;
      grid-template-columns: 54px 1fr;
      gap: 14px;
      align-items: center;
      min-width: 0;
    }

    .loop-step:not(:last-child)::after {
      position: absolute;
      top: 50%;
      right: -30px;
      width: 28px;
      height: 14px;
      background:
        linear-gradient(var(--blue-800), var(--blue-800)) left 6px / 21px 3px no-repeat;
      clip-path: polygon(0 35%, 72% 35%, 72% 0, 100% 50%, 72% 100%, 72% 65%, 0 65%);
      content: "";
      opacity: .9;
      transform: translateY(-50%);
    }

    .loop-icon {
      display: grid;
      place-items: center;
      width: 54px;
      height: 54px;
      border-radius: 14px;
      background: linear-gradient(135deg, var(--violet-2), var(--blue-800));
      color: #fff;
      box-shadow: 0 12px 24px rgba(43, 52, 203, .18);
      overflow: hidden;
    }

    .loop-icon.circle {
      border-radius: 999px;
    }

    .loop-icon.green {
      background: #19c463;
    }

    .loop-icon.red {
      background: linear-gradient(135deg, #ff6a3a, #ff2d2d);
    }

    .loop-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .loop-icon svg {
      width: 30px;
      height: 30px;
    }

    .loop-label {
      min-width: 0;
    }

    .loop-label strong {
      display: block;
      color: var(--ink);
      font-size: clamp(14px, 1.3vw, 18px);
      font-weight: 900;
      line-height: 1.25;
    }

    .loop-label span {
      display: block;
      margin-top: 5px;
      color: var(--muted);
      font-size: 12px;
      font-weight: 700;
      line-height: 1.4;
    }

    .download {
      position: relative;
      overflow: hidden;
      border-radius: 22px;
      background: linear-gradient(135deg, #1716a4, #2a2bd1 55%, #4029c9);
      color: #fff;
      padding: 70px 0 44px;
    }

    .download::before {
      position: absolute;
      right: -10%;
      top: 170px;
      left: -10%;
      height: 230px;
      border-radius: 50% 50% 0 0;
      background: #f7f8ff;
      content: "";
    }

    .download .shell {
      position: relative;
      z-index: 1;
    }

    .download-head {
      text-align: center;
      margin-bottom: 72px;
    }

    .download-head h2 {
      font-size: clamp(38px, 5vw, 58px);
      font-weight: 900;
    }

    .download-head p {
      margin-top: 14px;
      color: rgba(255, 255, 255, .85);
      font-size: 18px;
      font-weight: 700;
    }

    .download-cards {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 28px;
      color: var(--ink);
    }

    .download-card {
      background: #fff;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 42px 32px 30px;
      text-align: center;
    }

    .download-card .app-icon { margin: 0 auto 20px; }

    .btn-disabled {
      cursor: not-allowed;
      opacity: .48;
      box-shadow: none;
      transform: none;
    }

    .agreement-modal {
      position: fixed;
      inset: 0;
      z-index: 100;
      display: none;
      align-items: center;
      justify-content: center;
      padding: 24px;
      background: rgba(16, 18, 61, .62);
      backdrop-filter: blur(14px);
    }

    .agreement-modal.is-open {
      display: flex;
    }

    .agreement-dialog {
      width: min(100%, 860px);
      max-height: min(86vh, 820px);
      display: grid;
      grid-template-rows: auto minmax(0, 1fr) auto;
      overflow: hidden;
      border: 1px solid rgba(196, 203, 236, .86);
      border-radius: 18px;
      background: #fff;
      box-shadow: 0 34px 90px rgba(10, 14, 80, .28);
    }

    .agreement-head,
    .agreement-foot {
      padding: 22px 26px;
    }

    .agreement-head {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 20px;
      border-bottom: 1px solid var(--line);
      background: linear-gradient(135deg, #f8f9ff, #fff);
    }

    .agreement-head h3 {
      color: var(--blue-800);
      font-size: 26px;
      font-weight: 900;
    }

    .agreement-head p {
      margin-top: 6px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 700;
    }

    .agreement-close {
      width: 38px;
      height: 38px;
      border-radius: 999px;
      background: #eef1ff;
      color: var(--blue-800);
      font-size: 24px;
      line-height: 1;
    }

    .agreement-body {
      overflow: auto;
      padding: 24px 30px;
      color: #29315f;
      line-height: 1.76;
    }

    .agreement-body h4 {
      margin: 22px 0 8px;
      color: var(--ink);
      font-size: 17px;
      font-weight: 900;
    }

    .agreement-body h4:first-child {
      margin-top: 0;
    }

    .agreement-body p {
      margin: 8px 0;
      font-size: 14px;
    }

    .agreement-body ol {
      margin: 8px 0 0;
      padding-left: 1.3em;
    }

    .agreement-body li {
      margin: 8px 0;
      font-size: 14px;
    }

    .agreement-foot {
      display: grid;
      gap: 16px;
      border-top: 1px solid var(--line);
      background: #fbfcff;
    }

    .agreement-check {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: var(--ink);
      font-size: 14px;
      font-weight: 800;
    }

    .agreement-check input {
      width: 18px;
      height: 18px;
      margin-top: 1px;
      accent-color: var(--violet);
    }

    .agreement-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: flex-end;
      gap: 12px;
    }

    .trust-strip {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 22px;
      margin-top: 44px;
      padding: 24px 34px;
      color: var(--ink);
    }

    .trust-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 900;
    }

    .trust-item span {
      display: block;
      color: var(--muted);
      font-size: 13px;
      font-weight: 600;
      margin-top: 4px;
    }

    .qr-band {
      display: grid;
      grid-template-columns: 1fr auto;
      align-items: center;
      gap: 24px;
      margin-top: 28px;
      padding: 28px 48px;
      color: var(--blue-800);
      background: #e9edff;
    }

    .qr-band h3 {
      font-size: 30px;
      font-weight: 900;
      text-align: center;
    }

    .qr {
      display: grid;
      place-items: center;
      width: 112px;
      height: 112px;
      border-radius: 8px;
      background: #fff;
      border: 8px solid #fff;
      box-shadow: 0 8px 18px rgba(28, 32, 110, .14);
      overflow: hidden;
    }

    .qr img {
      display: block;
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .footer {
      margin-top: 10px;
      border-radius: 0 0 20px 20px;
      background: linear-gradient(135deg, #1920a8, #2c31c8);
      color: rgba(255, 255, 255, .82);
      padding: 26px 0;
      font-size: 13px;
    }

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

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

    .footer-legal {
      display: grid;
      gap: 5px;
      text-align: right;
    }

    .official-site {
      color: #fff;
      font-weight: 700;
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .official-domain-note {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 16px;
      margin-top: 18px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 800;
    }

    .official-domain-note a,
    .product-detail-link {
      color: var(--blue-800);
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .product-detail-link {
      display: inline-flex;
      margin: 14px 0 4px;
      font-size: 14px;
      font-weight: 800;
    }

    .icon-line {
      width: 22px;
      height: 22px;
    }

    @media (max-width: 1440px) {
      :root {
        --container: 1280px;
      }

      .shell {
        padding: 0 clamp(20px, 4vw, 48px);
      }

      .hero-panel {
        min-height: 560px;
      }

      .hero-panel::after {
        right: -80px;
        bottom: -160px;
        width: 620px;
        height: 620px;
        border-width: 70px;
      }

      .topbar {
        padding: 20px clamp(22px, 4vw, 46px) 0;
      }

      .hero {
        grid-template-columns: minmax(0, 1fr) minmax(500px, .95fr);
        gap: clamp(42px, 5vw, 72px);
        min-height: 486px;
        padding: 44px clamp(24px, 5vw, 64px) 58px;
      }

      h1 {
        font-size: clamp(46px, 7vw, 76px);
      }

      .hero-sub {
        font-size: clamp(24px, 2.8vw, 34px);
      }

      .hero-copy {
        max-width: 650px;
        margin-top: 22px;
        font-size: 17px;
      }

      .hero-points {
        gap: 18px;
        max-width: 610px;
        margin-top: 46px;
      }

      .visual {
        min-height: 430px;
        isolation: isolate;
      }

      .laptop {
        top: 58px;
        right: 40px;
        width: min(38vw, 500px);
      }

      .phone {
        top: 88px;
        right: 20px;
        width: 136px;
        height: 286px;
      }

      .bot {
        right: min(30vw, 340px);
        bottom: 0;
        width: 170px;
        height: 170px;
      }

      .float-app {
        right: 22px;
        width: 62px;
        height: 62px;
        border-radius: 13px;
      }

      .float-app.wechat {
        top: 110px;
      }

      .float-app.monitor {
        top: 202px;
      }

      .section {
        padding: clamp(62px, 8vw, 92px) 0;
      }

      .cards {
        gap: 28px;
      }

      .card {
        padding: 30px;
        min-height: 520px;
      }
    }

    @media (min-width: 1680px) {
      .hero-wrap {
        padding: 14px;
      }

      .nav {
        min-height: 64px;
      }

      .brand {
        font-size: 28px;
      }

      .logo-icon {
        width: 40px;
        height: 40px;
      }

      .nav-links {
        gap: 44px;
        font-size: 15px;
      }

      .btn {
        min-height: 52px;
        padding: 14px 30px;
      }

      .pill {
        padding: 12px 22px;
        font-size: 16px;
      }

      .point {
        font-size: 15px;
      }

      .point-icon {
        width: 48px;
        height: 48px;
      }

      .section-title {
        margin-bottom: 52px;
        font-size: 48px;
      }

      .app-icon {
        width: 86px;
        height: 86px;
        border-radius: 22px;
        margin-bottom: 24px;
      }

      .product-kicker {
        font-size: 19px;
      }

      .card h3 {
        font-size: 31px;
      }

      .card p {
        font-size: 17px;
      }

      .list {
        gap: 13px;
        font-size: 15px;
      }
    }

    @media (max-width: 1080px) {
      .shell {
        padding: 0 clamp(20px, 4vw, 48px);
      }

      .hero,
      .cards,
      .download-cards,
      .trust-strip {
        grid-template-columns: 1fr;
      }

      .loop-panel {
        padding: 34px 22px 24px;
      }

      .loop-row {
        grid-template-columns: 1fr;
        gap: 18px;
        align-items: stretch;
      }

      .loop-step:not(:last-child)::after {
        top: auto;
        right: auto;
        bottom: -18px;
        left: 25px;
        width: 3px;
        height: 18px;
        background: var(--blue-800);
        clip-path: none;
        transform: none;
      }

      .hero-panel { min-height: auto; }
      .hero {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .visual { min-height: 410px; }
      .laptop { right: 90px; width: min(72vw, 445px); }
      .phone { right: 38px; }
      .bot { right: auto; left: 20px; }
    }

    @media (max-width: 820px) {
      .hero-wrap { padding: 0; }
      .hero-panel, .download, .footer { border-radius: 0; }
      .nav-links, .topbar .btn-glass { display: none; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-links.is-open {
        position: fixed;
        top: 78px;
        right: 16px;
        left: 16px;
        display: grid;
        gap: 0;
        padding: 8px;
        border-radius: var(--radius);
        background: rgba(24, 24, 168, .96);
        box-shadow: 0 24px 60px rgba(0, 0, 0, .22);
      }
      .nav-links.is-open a { padding: 16px; }
      .hero { padding-top: 30px; }
      .hero-points { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .visual { min-height: 330px; }
      .laptop { top: 46px; right: 58px; width: 330px; }
      .phone { top: 74px; right: 16px; width: 96px; height: 206px; }
      .bot { width: 125px; height: 125px; bottom: 12px; }
      .float-app { display: none; }
      .qr-band, .footer .shell { grid-template-columns: 1fr; flex-direction: column; text-align: center; }
      .footer-legal { text-align: center; }
    }

    @media (max-width: 520px) {
      .brand { font-size: 19px; }
      .logo-icon { width: 30px; height: 30px; }
      h1 { font-size: 42px; }
      .hero-sub { font-size: clamp(20px, 5.8vw, 23px); }
      .hero-copy { font-size: 15px; }
      .hero-points { gap: 14px; }
      .visual { min-height: 285px; }
      .laptop { right: 36px; width: 280px; }
      .phone { right: 5px; width: 82px; height: 178px; }
      .bot { left: 0; width: 108px; height: 108px; }
      .card, .download-card { padding: 24px; }
      .section-title { gap: 10px; }
      .slashes { display: none; }
      .qr-band { padding: 24px; }
    }

    /* Light Fidelity theme: keeps current content, restores the earlier glassy product-page feel. */
    .hero-wrap {
      padding: 0;
    }

    .hero-panel {
      min-height: clamp(720px, 52vw, 900px);
      border-radius: 0;
      background:
        radial-gradient(circle at 78% 18%, rgba(177, 197, 255, .42), transparent 28%),
        radial-gradient(circle at 12% 72%, rgba(218, 226, 255, .55), transparent 34%),
        linear-gradient(180deg, #faf9fa 0%, #fff 74%, #f4f6ff 100%);
      color: var(--ink);
      box-shadow: none;
    }

    .hero-panel::after {
      right: -170px;
      bottom: -210px;
      width: clamp(680px, 42vw, 920px);
      height: clamp(680px, 42vw, 920px);
      border: clamp(64px, 5vw, 96px) solid rgba(9, 76, 178, .06);
    }

    .topbar {
      position: fixed;
      inset: 0 0 auto;
      padding: 0;
      background: rgba(250, 249, 250, .82);
      border-bottom: 1px solid rgba(195, 198, 213, .32);
      box-shadow: 0 18px 48px rgba(27, 28, 29, .05);
      backdrop-filter: blur(18px);
    }

    .topbar .nav {
      width: min(100%, var(--container));
      min-height: 78px;
      margin: 0 auto;
      padding: 0 clamp(24px, 4.8vw, 96px);
    }

    .brand {
      color: var(--blue-800);
    }

    .nav-links {
      color: var(--muted);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--blue-800);
    }

    .nav-links a::after {
      background: var(--blue-800);
    }

    .btn-glass {
      border-color: rgba(35, 38, 197, .16);
      background: linear-gradient(135deg, var(--blue-800), var(--violet));
      color: #fff;
      box-shadow: 0 14px 30px rgba(35, 38, 197, .2);
    }

    .hero {
      grid-template-columns: minmax(520px, .9fr) minmax(620px, 1.1fr);
      gap: clamp(54px, 7vw, 118px);
      min-height: clamp(650px, 44vw, 820px);
      padding-top: clamp(120px, 9vw, 154px);
      padding-bottom: clamp(76px, 7vw, 118px);
    }

    .pill {
      background: rgba(218, 226, 255, .58);
      border: 1px solid rgba(9, 76, 178, .13);
      color: var(--blue-800);
    }

    .hero h1 {
      color: var(--ink);
      font-size: clamp(58px, 4.9vw, 96px);
      text-shadow: none;
    }

    .hero-sub {
      color: var(--blue-800);
      max-width: 790px;
      white-space: nowrap;
      font-size: clamp(22px, 2.05vw, 32px);
      line-height: 1.2;
    }

    .hero-copy {
      color: var(--muted);
    }

    .point {
      color: var(--muted);
    }

    .point-icon {
      border-color: rgba(35, 38, 197, .16);
      background: rgba(218, 226, 255, .5);
      color: var(--blue-800);
    }

    .visual {
      min-height: clamp(520px, 34vw, 680px);
      perspective: 1100px;
      isolation: isolate;
    }

    .visual::before,
    .visual::after {
      position: absolute;
      content: "";
      pointer-events: none;
      z-index: 0;
    }

    .visual::before {
      inset: 8% 0 5% 4%;
      border: clamp(46px, 4.6vw, 88px) solid rgba(177, 197, 255, .34);
      border-radius: 999px;
      opacity: .9;
    }

    .visual::after {
      right: 10%;
      bottom: 8%;
      width: 62%;
      height: 42%;
      border-radius: 999px;
      background: radial-gradient(ellipse, rgba(35, 38, 197, .14), transparent 68%);
      filter: blur(16px);
      opacity: .7;
    }

    .laptop {
      z-index: 2;
      top: clamp(72px, 6vw, 118px);
      right: clamp(110px, 7vw, 170px);
      width: clamp(570px, 34vw, 720px);
      border: 1px solid rgba(195, 198, 213, .34);
      background: rgba(255, 255, 255, .72);
      box-shadow: 0 26px 70px rgba(27, 28, 29, .11);
      backdrop-filter: blur(18px);
      transform: rotate(-3.5deg) rotateY(-7deg);
      transform-origin: right;
    }

    .screenbar {
      background: rgba(255, 255, 255, .86);
    }

    .ui-grid {
      background: rgba(245, 243, 244, .64);
    }

    .ui-row {
      background: rgba(255, 255, 255, .92);
    }

    .phone {
      z-index: 4;
      top: clamp(114px, 8vw, 172px);
      right: clamp(18px, 2vw, 52px);
      width: clamp(138px, 8.2vw, 176px);
      height: clamp(292px, 17vw, 370px);
      background: rgba(247, 249, 255, .92);
      transform: none;
    }

    .bot {
      z-index: 3;
      right: clamp(390px, 23vw, 510px);
      bottom: clamp(34px, 4.6vw, 92px);
      width: clamp(198px, 12vw, 262px);
      height: clamp(198px, 12vw, 262px);
    }

    .float-app {
      z-index: 5;
      border-radius: clamp(18px, 1.4vw, 24px);
      box-shadow: 0 22px 46px rgba(31, 27, 150, .16);
      animation: floatIcon 4.6s ease-in-out infinite;
    }

    .float-app.wechat {
      top: auto;
      right: clamp(238px, 14.5vw, 350px);
      bottom: clamp(172px, 11vw, 230px);
      z-index: 4;
      background: linear-gradient(135deg, #31cb68, #18b653);
      animation-delay: -1.9s;
    }

    .float-app.robot-product {
      right: clamp(202px, 12.6vw, 312px);
      bottom: clamp(158px, 10.4vw, 216px);
      z-index: 5;
      animation-delay: -.7s;
    }

    .float-app.monitor {
      top: clamp(190px, 13vw, 264px);
      left: clamp(74px, 5vw, 116px);
      right: auto;
      animation-delay: -1.4s;
    }

    .float-app.order {
      top: clamp(58px, 4.6vw, 98px);
      right: clamp(318px, 19.5vw, 458px);
      animation-delay: -2.8s;
    }

    @keyframes floatIcon {
      0%, 100% {
        transform: translate3d(0, 0, 0);
      }
      50% {
        transform: translate3d(0, -12px, 0);
      }
    }

    .section {
      background: #f7f8ff;
    }

    .card,
    .download-card,
    .loop-panel,
    .trust-strip,
    .qr-band {
      border-color: rgba(195, 198, 213, .72);
      background: rgba(255, 255, 255, .9);
      box-shadow: 0 24px 64px rgba(30, 33, 120, .12);
    }

    .download {
      border-radius: 0;
      background:
        radial-gradient(circle at 18% 26%, rgba(177, 197, 255, .36), transparent 30%),
        linear-gradient(135deg, #fff 0%, #f4f6ff 48%, #eef2ff 100%);
      color: var(--ink);
    }

    .download::before {
      display: none;
    }

    .download-head h2 {
      color: var(--blue-800);
    }

    .download-head p {
      color: var(--muted);
    }

    .download-options {
      display: grid;
      gap: 10px;
      margin-top: auto;
    }

    .btn-pending {
      border: 1px solid rgba(195, 198, 213, .72);
      background: #eef1ff;
      color: #737aa2;
      cursor: not-allowed;
      box-shadow: none;
    }

    .screenbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 0 18px;
      color: #6d7398;
      font-size: 12px;
      font-weight: 900;
    }

    .screenbar span:first-child {
      color: var(--ink);
    }

    .screenbar span:last-child {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .screenbar span:last-child::before {
      width: 7px;
      height: 7px;
      border-radius: 999px;
      background: #18c25b;
      content: "";
    }

    .dashboard-screen {
      display: grid;
      grid-template-columns: 128px minmax(0, 1fr);
      min-height: 320px;
      background: linear-gradient(135deg, rgba(255, 255, 255, .94), rgba(244, 247, 255, .9));
    }

    .screen-sidebar {
      display: grid;
      align-content: start;
      gap: 9px;
      padding: 18px 12px;
      border-right: 1px solid rgba(195, 198, 213, .5);
      background: linear-gradient(180deg, #19204b, #12162f);
    }

    .screen-tab {
      display: flex;
      align-items: center;
      gap: 8px;
      min-height: 26px;
      border-radius: 7px;
      padding: 0 9px;
      color: rgba(255, 255, 255, .7);
      font-size: 11px;
      font-weight: 800;
    }

    .screen-tab.is-active {
      background: rgba(71, 72, 247, .9);
      color: #fff;
    }

    .screen-dot {
      width: 7px;
      height: 7px;
      border-radius: 999px;
      background: currentColor;
      opacity: .7;
    }

    .screen-work {
      display: grid;
      gap: 12px;
      padding: 16px;
      min-width: 0;
    }

    .metric-row {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 10px;
    }

    .metric-card {
      min-width: 0;
      border: 1px solid rgba(195, 198, 213, .52);
      border-radius: 9px;
      background: rgba(255, 255, 255, .9);
      padding: 10px;
      box-shadow: 0 10px 26px rgba(30, 33, 120, .07);
    }

    .metric-card span {
      display: block;
      color: var(--muted);
      font-size: 10px;
      font-weight: 800;
    }

    .metric-card strong {
      display: block;
      margin-top: 3px;
      color: var(--ink);
      font-size: 18px;
      font-weight: 900;
      line-height: 1;
    }

    .metric-card.is-order {
      border-color: rgba(250, 221, 43, .6);
      background: linear-gradient(135deg, rgba(250, 221, 43, .2), #fff);
    }

    .metric-card.is-live {
      border-color: rgba(71, 72, 247, .32);
      background: linear-gradient(135deg, rgba(71, 72, 247, .12), #fff);
    }

    .screen-panels {
      display: grid;
      grid-template-columns: 1fr .72fr;
      gap: 12px;
    }

    .screen-panel,
    .software-shot {
      border: 1px solid rgba(195, 198, 213, .58);
      border-radius: 10px;
      background: rgba(255, 255, 255, .88);
      overflow: hidden;
    }

    .panel-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid rgba(195, 198, 213, .46);
      padding: 9px 11px;
      color: var(--ink);
      font-size: 11px;
      font-weight: 900;
    }

    .panel-head span:last-child {
      color: var(--blue-800);
      font-size: 10px;
    }

    .chart-lines {
      position: relative;
      height: 86px;
      margin: 12px;
      border-radius: 8px;
      background:
        linear-gradient(rgba(71, 72, 247, .08) 1px, transparent 1px) 0 0 / 100% 25%,
        linear-gradient(90deg, rgba(71, 72, 247, .08) 1px, transparent 1px) 0 0 / 20% 100%,
        #f9faff;
    }

    .chart-lines::before,
    .chart-lines::after {
      position: absolute;
      right: 10px;
      left: 10px;
      height: 3px;
      border-radius: 999px;
      content: "";
    }

    .chart-lines::before {
      top: 36px;
      background: linear-gradient(90deg, transparent, #4748f7 18%, #8094ff 52%, #4748f7 86%, transparent);
      transform: skewY(-8deg);
    }

    .chart-lines::after {
      top: 56px;
      background: linear-gradient(90deg, transparent, #fadd2b 22%, #ffbf1a 58%, transparent);
      transform: skewY(7deg);
    }

    .activity-list {
      display: grid;
      gap: 8px;
      padding: 12px;
    }

    .activity-item {
      display: grid;
      grid-template-columns: 8px 1fr auto;
      gap: 8px;
      align-items: center;
      color: var(--muted);
      font-size: 10px;
      font-weight: 800;
    }

    .activity-item::before {
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: #4748f7;
      content: "";
    }

    .activity-item.is-alert::before {
      background: #fadd2b;
    }

    .data-table {
      display: grid;
      gap: 6px;
      border: 1px solid rgba(195, 198, 213, .58);
      border-radius: 10px;
      background: rgba(255, 255, 255, .86);
      padding: 10px;
    }

    .data-row {
      display: grid;
      grid-template-columns: 1.1fr .9fr .8fr .7fr;
      gap: 8px;
      align-items: center;
      min-height: 22px;
      color: #5c6387;
      font-size: 10px;
      font-weight: 800;
    }

    .data-row span {
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .status-pill {
      justify-self: start;
      border-radius: 999px;
      padding: 3px 7px;
      background: rgba(24, 194, 91, .12);
      color: #14924a;
      font-size: 9px;
      font-weight: 900;
    }

    .status-pill.is-warning {
      background: rgba(250, 221, 43, .22);
      color: #8b6c00;
    }

    .phone-screen {
      display: grid;
      grid-template-rows: auto 1fr auto;
      height: 100%;
      background: linear-gradient(180deg, #f9fbff, #eef3ff);
    }

    .phone-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 12px 10px;
      color: var(--ink);
      font-size: 12px;
      font-weight: 900;
    }

    .phone-chip {
      border-radius: 999px;
      background: rgba(24, 194, 91, .13);
      color: #13964d;
      padding: 4px 7px;
      font-size: 9px;
    }

    .phone-feed {
      display: grid;
      align-content: start;
      gap: 9px;
      padding: 0 10px;
    }

    .bubble {
      border-radius: 12px;
      background: #fff;
      padding: 9px;
      color: var(--muted);
      font-size: 10px;
      font-weight: 800;
      line-height: 1.45;
      box-shadow: 0 8px 18px rgba(30, 33, 120, .08);
    }

    .bubble.is-out {
      background: linear-gradient(135deg, #4748f7, #6e73ff);
      color: #fff;
    }

    .phone-actions {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 7px;
      padding: 10px;
    }

    .phone-action {
      border-radius: 9px;
      background: #fff;
      padding: 8px 4px;
      color: var(--blue-800);
      font-size: 9px;
      font-weight: 900;
      text-align: center;
    }

    .product-preview {
      margin: 20px 0 4px;
    }

    .software-shot {
      min-height: 168px;
      background:
        radial-gradient(circle at 82% 10%, rgba(71, 72, 247, .12), transparent 34%),
        #fff;
    }

    .shot-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid rgba(195, 198, 213, .52);
      padding: 10px 12px;
      color: var(--ink);
      font-size: 11px;
      font-weight: 900;
    }

    .shot-toolbar span:last-child {
      border-radius: 999px;
      background: rgba(71, 72, 247, .1);
      color: var(--blue-800);
      padding: 4px 8px;
      font-size: 9px;
    }

    .shot-body {
      display: grid;
      gap: 9px;
      padding: 12px;
    }

    .order-table {
      display: grid;
      gap: 6px;
    }

    .order-row,
    .monitor-row {
      display: grid;
      grid-template-columns: 1fr .68fr .56fr;
      gap: 8px;
      align-items: center;
      min-height: 24px;
      border-radius: 7px;
      background: #f7f9ff;
      padding: 0 8px;
      color: var(--muted);
      font-size: 10px;
      font-weight: 800;
    }

    .order-row strong,
    .monitor-row strong {
      color: var(--ink);
      font-size: 10px;
    }

    .shot-ok {
      color: #13964d;
    }

    .shot-warning {
      color: #a17400;
    }

    .bot-chat {
      display: grid;
      gap: 8px;
    }

    .bot-message {
      display: grid;
      grid-template-columns: 28px 1fr;
      gap: 8px;
      align-items: start;
    }

    .bot-avatar {
      display: grid;
      place-items: center;
      width: 28px;
      height: 28px;
      border-radius: 9px;
      background: #4748f7;
      color: #fff;
      font-size: 10px;
      font-weight: 900;
    }

    .bot-text {
      border-radius: 10px;
      background: #f5f7ff;
      padding: 8px;
      color: var(--muted);
      font-size: 10px;
      font-weight: 800;
      line-height: 1.45;
    }

    .bot-text.is-command {
      border: 1px solid rgba(71, 72, 247, .25);
      background: #fff;
      color: var(--ink);
    }

    .monitor-bars {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 6px;
      align-items: end;
      height: 68px;
      border-radius: 8px;
      background: #f7f9ff;
      padding: 10px;
    }

    .monitor-bars span {
      border-radius: 999px 999px 3px 3px;
      background: linear-gradient(180deg, #4748f7, #9aa4ff);
    }

    .monitor-bars span:nth-child(1) { height: 38%; }
    .monitor-bars span:nth-child(2) { height: 66%; }
    .monitor-bars span:nth-child(3) { height: 48%; }
    .monitor-bars span:nth-child(4) { height: 78%; }
    .monitor-bars span:nth-child(5) { height: 56%; }
    .monitor-bars span:nth-child(6) { height: 88%; }

    .asset-frame {
      border: 0;
      background: transparent;
      box-shadow: none;
      overflow: visible;
      backdrop-filter: none;
    }

    .hero-asset,
    .preview-asset {
      display: block;
      width: 100%;
      height: auto;
      user-select: none;
      -webkit-user-drag: none;
    }

    .asset-frame > picture,
    .asset-preview > picture {
      display: contents;
    }

    .laptop.monitor-hero {
      top: clamp(38px, 4vw, 72px);
      right: clamp(-96px, -4vw, -36px);
      width: clamp(720px, 46vw, 940px);
      transform: rotate(-2deg) rotateY(-4deg);
      transform-origin: center;
    }

    .laptop.monitor-hero .hero-asset {
      filter: drop-shadow(0 38px 70px rgba(24, 28, 92, .22));
    }

    .phone.robot-phone-hero {
      top: auto;
      right: auto;
      left: clamp(-52px, -3vw, -16px);
      bottom: clamp(8px, 2vw, 44px);
      width: clamp(230px, 15vw, 330px);
      height: auto;
      transform: rotate(-4deg);
    }

    .phone.robot-phone-hero .hero-asset {
      filter: drop-shadow(0 26px 48px rgba(35, 38, 197, .2));
    }

    .asset-preview {
      display: grid;
      place-items: center;
      min-height: 210px;
      border: 1px solid rgba(195, 198, 213, .58);
      border-radius: 14px;
      background:
        radial-gradient(circle at 76% 14%, rgba(71, 72, 247, .1), transparent 36%),
        linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(246, 248, 255, .92));
      overflow: hidden;
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .65);
    }

    .asset-preview .preview-asset {
      width: 100%;
      max-height: 230px;
      object-fit: contain;
      padding: 10px;
      filter: drop-shadow(0 16px 26px rgba(24, 28, 92, .12));
    }

    .order-preview .preview-asset {
      max-height: 244px;
      padding: 4px;
    }

    .robot-preview {
      background:
        radial-gradient(circle at 12% 36%, rgba(250, 221, 43, .42), transparent 42%),
        linear-gradient(135deg, rgba(255, 255, 255, .98), rgba(248, 250, 255, .94));
    }

    .robot-preview .preview-asset {
      max-height: 238px;
    }

    .monitor-preview .preview-asset {
      max-height: 236px;
      padding: 0;
    }

    .capability-grid,
    .scenario-grid,
    .about-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: clamp(18px, 2vw, 28px);
    }

    .capability-card,
    .scenario-card,
    .about-card,
    .download-support {
      border: 1px solid rgba(195, 198, 213, .72);
      border-radius: var(--radius);
      background: rgba(255, 255, 255, .9);
      box-shadow: 0 20px 58px rgba(30, 33, 120, .09);
    }

    .capability-card,
    .scenario-card,
    .about-card {
      padding: clamp(22px, 2vw, 32px);
    }

    .capability-card {
      display: grid;
      grid-template-columns: 54px 1fr;
      gap: 16px;
      align-items: start;
    }

    .capability-icon,
    .scenario-icon,
    .about-icon {
      display: grid;
      place-items: center;
      width: 54px;
      height: 54px;
      border-radius: 16px;
      background: rgba(71, 72, 247, .08);
      color: var(--blue-800);
    }

    .capability-card h3,
    .scenario-card h3,
    .about-card h3 {
      color: var(--ink);
      font-size: 20px;
      font-weight: 900;
      line-height: 1.25;
    }

    .capability-card p,
    .scenario-card p,
    .about-card p,
    .download-support p,
    .about-copy {
      color: var(--muted);
      font-size: 14px;
      font-weight: 700;
      line-height: 1.75;
    }

    .capability-card p,
    .scenario-card p,
    .about-card p {
      margin-top: 8px;
    }

    .scenario-card a {
      color: var(--blue-800);
      font-weight: 800;
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .download-support {
      display: grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 24px;
      margin-top: 28px;
      padding: clamp(24px, 2.2vw, 34px);
    }

    .download-support h3 {
      color: var(--ink);
      font-size: 22px;
      font-weight: 900;
      line-height: 1.2;
    }

    .support-flow {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
      margin-top: 18px;
    }

    .support-step {
      display: grid;
      gap: 8px;
      justify-items: center;
      border: 1px solid rgba(195, 198, 213, .58);
      border-radius: var(--radius);
      padding: 16px 10px;
      color: var(--muted);
      font-size: 12px;
      font-weight: 800;
      text-align: center;
    }

    .support-step strong {
      color: var(--ink);
      font-size: 13px;
    }

    .requirement-groups {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 20px;
      margin-top: 18px;
    }

    .requirement-platform h4 {
      color: var(--ink);
      font-size: 14px;
      font-weight: 900;
    }

    .requirement-list {
      display: grid;
      gap: 10px;
      margin-top: 12px;
      padding: 0;
      list-style: none;
    }

    .requirement-list li {
      display: flex;
      align-items: center;
      gap: 9px;
      color: var(--muted);
      font-size: 13px;
      font-weight: 800;
    }

    .scenario-card {
      min-height: 178px;
    }

    .scenario-icon,
    .about-icon {
      margin-bottom: 18px;
    }

    .about-section {
      position: relative;
      padding: clamp(78px, 7vw, 124px) 0;
      background:
        radial-gradient(circle at 84% 18%, rgba(71, 72, 247, .12), transparent 30%),
        linear-gradient(180deg, #fff 0%, #f5f7ff 100%);
    }

    .about-panel {
      display: grid;
      grid-template-columns: minmax(0, .95fr) minmax(360px, .48fr);
      gap: clamp(28px, 4vw, 72px);
      align-items: stretch;
      border: 1px solid rgba(195, 198, 213, .72);
      border-radius: 18px;
      background: rgba(255, 255, 255, .86);
      box-shadow: 0 26px 70px rgba(30, 33, 120, .1);
      padding: clamp(28px, 4vw, 56px);
    }

    .about-head {
      max-width: 760px;
      margin-bottom: 28px;
    }

    .about-head h2 {
      color: var(--ink);
      font-size: clamp(32px, 4vw, 52px);
      font-weight: 900;
      line-height: 1.08;
    }

    .about-copy {
      margin-top: 14px;
      font-size: 16px;
    }

    .contact-card {
      display: grid;
      align-content: space-between;
      justify-items: center;
      min-height: 100%;
      border-radius: 16px;
      background:
        radial-gradient(circle at 72% 20%, rgba(250, 221, 43, .18), transparent 30%),
        linear-gradient(135deg, #151c45, #2428be);
      color: #fff;
      padding: 28px;
      text-align: center;
      overflow: hidden;
    }

    .contact-card h3 {
      font-size: 24px;
      font-weight: 900;
    }

    .contact-card p {
      margin-top: 10px;
      color: rgba(255, 255, 255, .74);
      font-size: 14px;
      font-weight: 700;
      line-height: 1.7;
    }

    .contact-meta {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 18px;
      align-items: center;
      justify-items: center;
      margin-top: 36px;
    }

    .contact-card .qr {
      width: clamp(168px, 12vw, 224px);
      height: auto;
      aspect-ratio: 892 / 1132;
      border-width: 10px;
      border-radius: 12px;
      box-shadow: 0 16px 34px rgba(0, 0, 0, .28);
    }

    .contact-card .qr img {
      object-fit: contain;
    }

    .contact-card .contact-meta {
      grid-template-columns: 1fr;
      align-items: center;
      justify-items: center;
      gap: 14px;
    }

    @media (max-width: 1440px) {
      .topbar .nav {
        padding: 0 clamp(20px, 4vw, 48px);
      }

      .hero {
        grid-template-columns: minmax(0, 1fr) minmax(500px, .95fr);
        padding-top: 116px;
      }

      .laptop {
        top: 88px;
        right: 58px;
        width: min(40vw, 500px);
        transform: rotate(-3deg);
      }

      .laptop.monitor-hero {
        top: 72px;
        right: -70px;
        width: min(54vw, 760px);
        transform: rotate(-2deg) rotateY(-3deg);
      }

      .phone {
        top: 112px;
        right: 8px;
      }

      .phone.robot-phone-hero {
        left: -28px;
        bottom: 22px;
        width: min(18vw, 250px);
      }

      .bot {
        right: min(31vw, 350px);
        width: 176px;
        height: 176px;
      }

      .float-app.order {
        right: 318px;
      }

      .float-app.wechat {
        right: 214px;
        bottom: 164px;
      }

      .float-app.robot-product {
        right: 180px;
        bottom: 148px;
      }

      .float-app.monitor {
        left: 78px;
        right: auto;
      }
    }

    @media (max-width: 1080px) {
      .topbar {
        position: sticky;
      }

      .hero {
        grid-template-columns: 1fr;
      }

      .laptop {
        right: 90px;
        width: min(72vw, 520px);
        transform: rotate(-2deg);
      }

      .laptop.monitor-hero {
        top: 18px;
        right: -26px;
        width: min(92vw, 760px);
        transform: rotate(-1deg);
      }

      .phone {
        right: 38px;
      }

      .phone.robot-phone-hero {
        left: 8px;
        bottom: 8px;
        width: min(27vw, 230px);
      }

      .bot {
        right: auto;
        left: 20px;
      }

      .float-app {
        width: 54px;
        height: 54px;
      }

      .float-app.order {
        display: none;
      }

      .float-app.robot-product {
        right: auto;
        left: 92px;
        bottom: 166px;
      }

      .float-app.wechat {
        right: auto;
        left: 34px;
        bottom: 144px;
      }

      .capability-grid,
      .scenario-grid,
      .about-grid,
      .download-support,
      .about-panel {
        grid-template-columns: 1fr;
      }

      .support-flow,
      .requirement-groups {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (max-width: 820px) {
      .topbar {
        background: rgba(250, 249, 250, .94);
      }

      .menu-toggle {
        background: rgba(35, 38, 197, .1);
        color: var(--blue-800);
      }

      .nav-links.is-open {
        background: rgba(255, 255, 255, .96);
        color: var(--muted);
      }

      .hero-panel {
        background: linear-gradient(180deg, #faf9fa, #fff 68%, #f4f6ff);
      }

      .float-app.wechat {
        display: grid;
        top: 76px;
        right: 24px;
        bottom: auto;
        left: auto;
      }

      .float-app.monitor {
        display: grid;
        top: 144px;
        right: 24px;
        left: auto;
      }

      .float-app.robot-product {
        display: none;
      }
    }

    @media (max-width: 520px) {
      body,
      .hero-wrap,
      .hero-panel,
      .topbar,
      .topbar .nav,
      .shell {
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
      }

      .topbar .nav {
        padding: 0 20px;
      }

      .menu-toggle {
        display: inline-grid !important;
        position: fixed;
        top: 19px;
        right: 20px;
        z-index: 60;
        width: 40px;
        height: 40px;
        border: 1px solid rgba(71, 72, 247, .18);
        background: #4748f7;
        color: #fff;
        font-size: 22px;
        font-weight: 900;
        box-shadow: 0 12px 26px rgba(71, 72, 247, .22);
      }

      .nav-links,
      .topbar .btn-glass {
        display: none !important;
      }

      .nav-links.is-open {
        display: grid !important;
      }

      .hero {
        display: block;
        overflow: hidden;
        padding-inline: 20px;
      }

      h1,
      .hero-sub,
      .hero-copy {
        max-width: calc(100vw - 40px);
        overflow-wrap: anywhere;
      }

      .hero h1 {
        font-size: 42px;
      }

      .hero-sub {
        max-width: calc(100vw - 40px);
        font-size: 18px;
        line-height: 1.35;
        white-space: normal;
        word-break: break-word;
      }

      .visual {
        width: 100%;
        min-height: 360px;
        margin-top: 40px;
        overflow: hidden;
      }

      .laptop {
        top: 26px;
        right: auto;
        left: 0;
        width: min(92vw, 348px);
        transform: none;
      }

      .laptop.monitor-hero {
        top: 20px;
        right: auto;
        left: 50%;
        width: min(108vw, 480px);
        transform: translateX(-50%);
      }

      .dashboard-screen {
        grid-template-columns: 82px minmax(0, 1fr);
        min-height: 260px;
      }

      .screen-sidebar {
        padding: 12px 8px;
      }

      .screen-tab {
        min-height: 24px;
        padding: 0 7px;
        font-size: 10px;
      }

      .screen-work {
        gap: 8px;
        padding: 10px;
      }

      .metric-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .screen-panels {
        grid-template-columns: 1fr;
      }

      .phone {
        display: none;
      }

      .phone.robot-phone-hero {
        display: none;
      }

      .asset-preview {
        min-height: 180px;
      }

      .asset-preview .preview-asset {
        max-height: 204px;
      }

      .about-section .shell {
        width: auto;
        max-width: none;
        margin: 0 44px 0 20px;
        padding: 0;
        overflow: visible;
      }

      .about-panel {
        display: block;
        width: 100%;
        max-width: 100%;
        min-width: 0;
        padding: 22px;
        overflow: hidden;
      }

      .about-grid {
        grid-template-columns: 1fr;
      }

      .contact-card {
        margin-top: 20px;
      }

      .about-panel > *,
      .about-head,
      .about-grid,
      .about-card,
      .contact-card {
        min-width: 0;
        max-width: 100%;
      }

      .about-copy,
      .about-card p,
      .contact-card p {
        overflow-wrap: anywhere;
        word-break: break-word;
      }

      .contact-card .qr {
        width: min(68vw, 224px);
      }

      .info-row {
        grid-template-columns: 1fr;
        gap: 4px;
      }

      .float-app.wechat,
      .float-app.monitor {
        display: none !important;
      }

      .support-flow,
      .requirement-groups,
      .contact-meta {
        grid-template-columns: 1fr;
      }
    }