:root {
      --ink: #102536;
      --text: #263d4d;
      --muted: #667b88;
      --line: #dfe8ee;
      --soft: #f5f9fb;
      --soft-blue: #eaf6fa;
      --white: #fff;
      --navy: #092133;
      --cyan: #19c7d8;
      --green: #35c987;
      --yellow: #f6bd45;
      --red: #ee6674;
      --shadow: 0 18px 48px rgba(16, 37, 54, .10);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
      color: var(--text);
      background: var(--white);
      line-height: 1.7;
    }

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

    img {
      max-width: 100%;
      display: block;
    }

    .wrap {
      width: min(1160px, calc(100% - 40px));
      margin: 0 auto;
    }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 30;
      background: rgba(255, 255, 255, .88);
      border-bottom: 1px solid rgba(223, 232, 238, .85);
      backdrop-filter: blur(18px);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--ink);
      font-weight: 900;
      white-space: nowrap;
    }

    .brand-logo {
      width: 48px;
      height: 48px;
      object-fit: contain;
      padding: 5px;
      border: 1px solid var(--line);
      border-radius: 10px;
      background: var(--white);
    }

    .links {
      display: flex;
      align-items: center;
      gap: 26px;
      color: #5b7180;
      font-size: 14px;
    }

    .menu-toggle,
    .menu-button {
      display: none;
    }

    .menu-button {
      width: 44px;
      height: 44px;
      border: 1px solid var(--line);
      border-radius: 8px;
      background: var(--white);
      align-items: center;
      justify-content: center;
      gap: 4px;
      flex-direction: column;
      cursor: pointer;
    }

    .menu-button span {
      width: 20px;
      height: 2px;
      background: var(--ink);
      border-radius: 2px;
    }

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

    .links a {
      position: relative;
      border-radius: 8px;
      transition: color .18s ease, background .18s ease;
    }

    .links a:not(.nav-btn)::after {
      content: "";
      position: absolute;
      left: 12px;
      right: 12px;
      bottom: -8px;
      height: 3px;
      border-radius: 3px;
      background: var(--cyan);
      opacity: 0;
      transform: scaleX(.55);
      transition: opacity .18s ease, transform .18s ease;
    }

    .links a:not(.nav-btn):hover,
    .links a.active:not(.nav-btn) {
      color: var(--ink);
      background: #eef7fa;
    }

    .links a:not(.nav-btn):hover::after,
    .links a.active:not(.nav-btn)::after {
      opacity: 1;
      transform: scaleX(1);
    }

    .nav-btn,
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      padding: 11px 18px;
      border-radius: 8px;
      font-weight: 800;
    }

    .nav-btn,
    .btn.primary {
      color: var(--white);
      background: var(--navy);
    }

    .btn.ghost {
      color: var(--ink);
      background: var(--white);
      border: 1px solid var(--line);
    }

    .hero {
      position: relative;
      overflow: hidden;
      background:
        linear-gradient(120deg, #f7fbfd 0%, #eef8fb 48%, #fff 100%);
    }

    .hero .wrap {
      min-height: 690px;
      display: grid;
      grid-template-columns: minmax(0, 1fr) 430px;
      align-items: center;
      gap: 70px;
      padding: 82px 0 92px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 18px;
      color: #0c9eb0;
      font-size: 15px;
      font-weight: 900;
    }

    .eyebrow::before {
      content: "";
      width: 34px;
      height: 3px;
      border-radius: 2px;
      background: var(--cyan);
    }

    h1,
    h2,
    h3,
    p {
      margin-top: 0;
    }

    h1 {
      max-width: 760px;
      margin-bottom: 20px;
      color: var(--ink);
      font-size: clamp(42px, 6vw, 66px);
      line-height: 1.08;
      letter-spacing: 0;
    }

    .hero-sub {
      margin-bottom: 18px;
      color: #0a9fb2;
      font-size: clamp(22px, 3vw, 32px);
      font-weight: 900;
    }

    .hero-copy {
      max-width: 700px;
      margin-bottom: 32px;
      color: #4c6370;
      font-size: 18px;
    }

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

    .hero-card {
      padding: 28px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 8px;
      box-shadow: var(--shadow);
    }

    .promise {
      padding: 28px;
      color: var(--white);
      background: var(--navy);
      border-radius: 8px;
    }

    .promise span {
      display: block;
      color: #8feaf2;
      font-weight: 900;
      margin-bottom: 8px;
    }

    .promise strong {
      display: block;
      font-size: 30px;
      line-height: 1.35;
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 18px;
    }

    .stat {
      padding: 18px 14px;
      text-align: center;
      background: var(--soft);
      border: 1px solid var(--line);
      border-radius: 8px;
    }

    .stat b {
      display: block;
      color: var(--ink);
      font-size: 25px;
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat small {
      color: var(--muted);
      font-weight: 700;
    }

    .section {
      padding: 86px 0;
      border-top: 1px solid #eef3f6;
    }

    .section.soft {
      background: var(--soft);
    }

    .section.dark {
      color: #d8e8ef;
      background: var(--navy);
      border-top: none;
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(260px, 430px);
      align-items: end;
      gap: 44px;
      margin-bottom: 42px;
    }

    .section h2 {
      margin-bottom: 0;
      color: var(--ink);
      font-size: clamp(30px, 4vw, 44px);
      line-height: 1.22;
      letter-spacing: 0;
    }

    .section.dark h2,
    .section.dark h3 {
      color: var(--white);
    }

    .lead {
      margin-bottom: 0;
      color: var(--muted);
      font-size: 17px;
    }

    .section.dark .lead {
      color: #aebfc9;
    }

    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }

    .pain {
      padding: 26px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 8px;
    }

    .pain h3 {
      margin-bottom: 8px;
      color: var(--ink);
      font-size: 21px;
    }

    .pain p {
      margin-bottom: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .service-list {
      display: grid;
      gap: 16px;
    }

    .service {
      display: grid;
      grid-template-columns: 220px minmax(0, 1fr) 210px;
      align-items: center;
      gap: 26px;
      min-height: 112px;
      padding: 24px 28px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 8px;
      box-shadow: 0 8px 28px rgba(16, 37, 54, .05);
    }

    .service-title {
      margin-bottom: 0;
      color: #079fb2;
      font-size: 24px;
    }

    .service:nth-child(2) .service-title {
      color: #25ad73;
    }

    .service:nth-child(3) .service-title {
      color: #c79020;
    }

    .service:nth-child(4) .service-title {
      color: #dc5361;
    }

    .service p {
      margin-bottom: 0;
      color: var(--muted);
    }

    .result {
      color: var(--ink);
      font-weight: 900;
      line-height: 1.45;
    }

    .solution-layout {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 42px;
      align-items: center;
    }

    .solution-panel {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .solution {
      padding: 24px;
      min-height: 178px;
      background: rgba(255, 255, 255, .06);
      border: 1px solid rgba(255, 255, 255, .13);
      border-radius: 8px;
    }

    .solution b {
      color: #70e5ee;
      font-size: 14px;
    }

    .solution p {
      margin: 8px 0 0;
      color: #bcd0d9;
      font-size: 15px;
    }

    .ppt-shot {
      margin: 0;
      padding: 18px;
      overflow: hidden;
      background: #071622;
      border: 1px solid rgba(255, 255, 255, .16);
      border-radius: 8px;
      box-shadow: 0 24px 64px rgba(0, 0, 0, .22);
    }

    .ppt-shot img {
      width: 100%;
      height: auto;
      border-radius: 6px;
      box-shadow: 0 14px 34px rgba(0, 0, 0, .18);
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 22px;
    }

    .case {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 210px;
      gap: 22px;
      align-items: stretch;
      min-height: 360px;
      padding: 24px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 8px;
    }

    .case.wide {
      grid-column: span 2;
      grid-template-columns: minmax(0, .9fr) minmax(360px, 1.1fr);
    }

    .tag {
      display: inline-flex;
      width: fit-content;
      margin-bottom: 22px;
      padding: 6px 10px;
      color: #087e8d;
      background: var(--soft-blue);
      border-radius: 6px;
      font-size: 13px;
      font-weight: 900;
    }

    .case h3 {
      color: var(--ink);
      font-size: 21px;
      line-height: 1.4;
    }

    .case p {
      margin-bottom: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .case-list {
      margin: 18px 0 0;
      padding: 0;
      list-style: none;
      color: #526977;
      font-size: 14px;
    }

    .case-list li {
      position: relative;
      padding-left: 15px;
      margin-top: 8px;
    }

    .case-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: .75em;
      width: 5px;
      height: 5px;
      border-radius: 50%;
      background: var(--cyan);
    }

    .case-media {
      display: grid;
      min-height: 280px;
      padding: 14px;
      background: #f3f7fa;
      border: 1px solid #dce8ee;
      border-radius: 8px;
      overflow: hidden;
    }

    .case-media img {
      width: 100%;
      height: 100%;
      max-height: 360px;
      object-fit: contain;
      border-radius: 6px;
      background: var(--white);
    }

    .case-media.security img {
      object-fit: cover;
      object-position: center;
    }

    .case-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .case-gallery img {
      width: 100%;
      height: 320px;
      object-fit: cover;
      object-position: top center;
      border-radius: 6px;
      border: 1px solid #e2edf2;
      background: var(--white);
    }

    .process {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 14px;
    }

    .step {
      padding: 22px 16px;
      min-height: 180px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 8px;
      text-align: center;
    }

    .step-num {
      width: 48px;
      height: 48px;
      margin: 0 auto 16px;
      display: grid;
      place-items: center;
      color: var(--white);
      background: var(--navy);
      border-radius: 50%;
      font-weight: 900;
    }

    .step h3 {
      color: var(--ink);
      font-size: 19px;
      margin-bottom: 8px;
    }

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

    .about {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 360px;
      gap: 40px;
      align-items: start;
    }

    .about-copy {
      color: #4f6673;
      font-size: 17px;
    }

    .points {
      display: grid;
      gap: 12px;
    }

    .point {
      padding: 18px 20px;
      background: var(--soft);
      border: 1px solid var(--line);
      border-radius: 8px;
      color: var(--ink);
      font-weight: 800;
    }

    .contact {
      color: var(--white);
      background:
        linear-gradient(90deg, rgba(9, 33, 51, .96), rgba(9, 33, 51, .9)),
        url("../../outputs/wanganzhilian-v2/tmp/preview/slide-04.png") center / cover no-repeat;
    }

    .contact .section-head {
      align-items: center;
    }

    .contact h2 {
      color: var(--white);
    }

    .contact-card {
      padding: 28px;
      background: rgba(255, 255, 255, .94);
      color: var(--ink);
      border-radius: 8px;
      box-shadow: var(--shadow);
    }

    .contact-row {
      display: grid;
      grid-template-columns: 96px minmax(0, 1fr);
      gap: 16px;
      padding: 16px 0;
      border-bottom: 1px solid #dce7ed;
    }

    .contact-row:last-child {
      border-bottom: 0;
    }

    .contact-row strong {
      color: #0b9eb0;
    }

    .qr {
      margin-top: 18px;
      padding: 18px;
      background: #f7fbfd;
      border: 1px solid #dce7ed;
      border-radius: 8px;
      text-align: center;
    }

    .qr img {
      width: min(100%, 220px);
      aspect-ratio: 1;
      margin: 0 auto 12px;
      object-fit: contain;
      padding: 10px;
      background: var(--white);
      border: 1px solid #e4edf2;
      border-radius: 8px;
    }

    .qr span {
      display: block;
      color: #516876;
      font-size: 14px;
      font-weight: 700;
    }

    footer {
      padding: 26px 0;
      color: #7a8f9b;
      background: #06131d;
      font-size: 14px;
    }

    footer .wrap {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
    }

    @media (max-width: 980px) {
      .nav {
        position: relative;
      }

      .menu-button {
        display: inline-flex;
      }

      .links {
        position: absolute;
        top: calc(100% + 1px);
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 10px;
        background: rgba(255, 255, 255, .98);
        border: 1px solid var(--line);
        border-radius: 0 0 8px 8px;
        box-shadow: 0 18px 36px rgba(16, 37, 54, .12);
      }

      .links a {
        padding: 14px 12px;
        border-bottom: 1px solid #edf3f6;
      }

      .links a:not(.nav-btn)::after {
        left: 12px;
        right: auto;
        bottom: 8px;
        width: 4px;
        height: calc(100% - 16px);
        transform: scaleY(.55);
      }

      .links a:not(.nav-btn):hover::after,
      .links a.active:not(.nav-btn)::after {
        transform: scaleY(1);
      }

      .links a:last-child {
        border-bottom: 0;
      }

      .links .nav-btn {
        margin-top: 8px;
        color: var(--white);
        text-align: center;
      }

      .menu-toggle:checked ~ .links {
        display: flex;
      }

      .hero .wrap,
      .section-head,
      .solution-layout,
      .about {
        grid-template-columns: 1fr;
      }

      .hero .wrap {
        min-height: auto;
        gap: 34px;
      }

      .ppt-shot {
        padding: 14px;
      }

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

      .case,
      .case.wide {
        grid-column: auto;
        grid-template-columns: 1fr;
      }

      .case-gallery img {
        height: 260px;
      }

      .service {
        grid-template-columns: 1fr;
        gap: 10px;
      }

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

    @media (max-width: 640px) {
      .wrap {
        width: min(100% - 28px, 1160px);
      }

      .nav {
        min-height: 64px;
      }

      .brand {
        font-size: 15px;
      }

      .brand-logo {
        width: 56px;
        height: 56px;
        padding: 6px;
      }

      .hero .wrap,
      .section {
        padding-top: 58px;
        padding-bottom: 58px;
      }

      .stats,
      .pain-grid,
      .solution-panel,
      .case-grid,
      .process {
        grid-template-columns: 1fr;
      }

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

      .case-media {
        min-height: 220px;
        padding: 10px;
      }

      .case-gallery {
        grid-template-columns: repeat(3, minmax(96px, 1fr));
        overflow-x: auto;
        padding-bottom: 4px;
      }

      .case-gallery img {
        height: 220px;
      }

      .contact-row {
        grid-template-columns: 1fr;
        gap: 2px;
      }

      .ppt-shot {
        padding: 8px;
        border-radius: 8px;
      }
    }