:root {
      --bg: #f6f8fb;
      --bg-soft: #eef2f7;
      --paper: #ffffff;
      --paper-2: #f9fbfd;
      --text: #1f2937;
      --muted: #667085;
      --line: #d7dde6;
      --silver: #b8c2cf;
      --silver-deep: #6f7d8d;
      --blue: #2f5f8f;
      --blue-deep: #173d63;
      --accent: #9aa8b8;
      --shadow: 0 22px 60px rgba(35, 48, 68, 0.11);
      --radius: 26px;
      --container: 1160px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 8% 6%, rgba(196, 207, 220, 0.58), transparent 28%),
        radial-gradient(circle at 92% 18%, rgba(220, 226, 234, 0.72), transparent 34%),
        linear-gradient(145deg, #ffffff 0%, #f1f4f8 42%, #f8fafc 100%);
      line-height: 1.75;
      overflow-x: hidden;
    }

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

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(248, 250, 252, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(170, 183, 199, 0.42);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      letter-spacing: 0.06em;
      color: #182536;
      flex: 0 0 auto;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #172033;
      background: linear-gradient(135deg, #ffffff 0%, #d8e0ea 48%, #eef2f7 100%);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.9), 0 10px 26px rgba(59, 74, 94, 0.15);
      border: 1px solid rgba(152, 166, 184, 0.62);
      font-size: 22px;
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand-text small {
      font-weight: 600;
      color: var(--muted);
      letter-spacing: 0.02em;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 6px;
      flex: 1 1 auto;
    }

    .nav-links a {
      padding: 9px 13px;
      border-radius: 999px;
      color: #344054;
      font-size: 14px;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover {
      background: rgba(216, 224, 234, 0.62);
      color: var(--blue-deep);
      transform: translateY(-1px);
    }

    .nav-cta {
      padding: 10px 16px;
      border-radius: 999px;
      background: linear-gradient(135deg, #26384e, #5f7186);
      color: #ffffff;
      font-size: 14px;
      box-shadow: 0 14px 28px rgba(39, 55, 76, 0.18);
      flex: 0 0 auto;
    }

    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: #ffffff;
      color: #27364a;
      border-radius: 14px;
      padding: 10px 12px;
      font-size: 15px;
      cursor: pointer;
    }

    main {
      position: relative;
    }

    .hero {
      padding: 76px 0 48px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 8px 14px;
      border: 1px solid rgba(153, 168, 185, 0.45);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
      color: #405268;
      font-size: 14px;
      box-shadow: 0 12px 32px rgba(45, 60, 80, 0.07);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: linear-gradient(135deg, #7f8ea1, #d7dde6);
      box-shadow: 0 0 0 5px rgba(154, 168, 184, 0.15);
    }

    h1 {
      margin: 22px 0 16px;
      font-size: clamp(38px, 6vw, 66px);
      line-height: 1.08;
      letter-spacing: -0.05em;
      color: #142235;
    }

    .hero-lead {
      max-width: 660px;
      margin: 0;
      color: #536274;
      font-size: clamp(16px, 2vw, 19px);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 30px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 20px;
      border-radius: 16px;
      font-weight: 700;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
    }

    .btn-primary {
      background: linear-gradient(135deg, #1f344d, #607387);
      color: #ffffff;
      box-shadow: 0 18px 34px rgba(31, 52, 77, 0.2);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 22px 42px rgba(31, 52, 77, 0.25);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.82);
      color: #243449;
      border: 1px solid rgba(153, 168, 185, 0.52);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      background: #ffffff;
      box-shadow: 0 14px 28px rgba(48, 62, 82, 0.1);
    }

    .hero-note {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
      margin-top: 34px;
      max-width: 720px;
    }

    .note-item {
      padding: 15px 16px;
      border: 1px solid rgba(174, 185, 198, 0.52);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.7);
      color: #3a4a5e;
      font-size: 14px;
    }

    .visual-panel {
      position: relative;
      padding: 24px;
      border-radius: 34px;
      background:
        linear-gradient(145deg, rgba(255,255,255,0.94), rgba(236,240,245,0.74)),
        radial-gradient(circle at 20% 12%, rgba(255,255,255,0.9), transparent 38%);
      border: 1px solid rgba(167, 181, 197, 0.58);
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatPanel 6s ease-in-out infinite;
    }

    .visual-panel::before {
      content: "";
      position: absolute;
      inset: -80px auto auto -70px;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      background: rgba(194, 204, 216, 0.28);
    }

    .device-card {
      position: relative;
      border-radius: 26px;
      background: linear-gradient(160deg, #172334, #415268 58%, #d8e0ea 59%, #ffffff 100%);
      padding: 18px;
      min-height: 330px;
      color: #ffffff;
      overflow: hidden;
    }

    .device-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      color: #eef3f8;
      font-size: 14px;
    }

    .device-screen {
      margin-top: 24px;
      padding: 20px;
      border-radius: 22px;
      background: rgba(255,255,255,0.13);
      border: 1px solid rgba(255,255,255,0.22);
    }

    .screen-line {
      height: 10px;
      border-radius: 999px;
      background: rgba(255,255,255,0.72);
      margin-bottom: 13px;
    }

    .screen-line:nth-child(2) {
      width: 74%;
      background: rgba(255,255,255,0.46);
    }

    .screen-line:nth-child(3) {
      width: 52%;
      background: rgba(255,255,255,0.28);
    }

    .decision-chip {
      position: absolute;
      right: 18px;
      bottom: 18px;
      width: min(260px, calc(100% - 36px));
      padding: 16px;
      border-radius: 20px;
      background: rgba(255,255,255,0.92);
      color: #203044;
      box-shadow: 0 18px 40px rgba(10, 21, 35, 0.18);
      border: 1px solid rgba(255,255,255,0.76);
    }

    .decision-chip strong {
      display: block;
      margin-bottom: 4px;
      color: #16263a;
    }

    .section {
      padding: 42px 0;
    }

    .section-head {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 24px;
    }

    .section-kicker {
      color: var(--blue);
      font-weight: 800;
      letter-spacing: 0.08em;
      font-size: 13px;
      text-transform: uppercase;
    }

    h2 {
      margin: 6px 0 0;
      color: #182536;
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.2;
      letter-spacing: -0.03em;
    }

    .section-head p {
      max-width: 470px;
      margin: 0;
      color: var(--muted);
    }

    .toc {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 18px;
      border-radius: 24px;
      background: rgba(255,255,255,0.72);
      border: 1px solid rgba(174, 185, 198, 0.5);
      box-shadow: 0 16px 44px rgba(46, 61, 82, 0.08);
    }

    .toc a {
      padding: 10px 14px;
      border-radius: 999px;
      background: #f3f6fa;
      color: #344054;
      font-size: 14px;
      border: 1px solid rgba(211, 218, 226, 0.84);
    }

    .cards {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }

    .card {
      position: relative;
      padding: 24px;
      border-radius: var(--radius);
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(173, 185, 199, 0.52);
      box-shadow: 0 14px 42px rgba(48, 62, 82, 0.08);
      transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 24px 54px rgba(48, 62, 82, 0.13);
      border-color: rgba(123, 141, 161, 0.65);
    }

    .card h3 {
      margin: 0 0 10px;
      color: #1c2b3f;
      font-size: 20px;
      line-height: 1.35;
    }

    .card p {
      margin: 0;
      color: #5f6e80;
      font-size: 15px;
    }

    .tag {
      display: inline-flex;
      margin-bottom: 14px;
      padding: 5px 10px;
      border-radius: 999px;
      color: #2d4057;
      background: linear-gradient(135deg, #eef2f7, #ffffff);
      border: 1px solid rgba(177, 189, 203, 0.62);
      font-size: 13px;
      font-weight: 700;
    }

    .split {
      display: grid;
      grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
      gap: 22px;
      align-items: stretch;
    }

    .panel {
      padding: 28px;
      border-radius: 30px;
      background: linear-gradient(145deg, rgba(255,255,255,0.82), rgba(240,244,249,0.76));
      border: 1px solid rgba(172, 184, 198, 0.52);
      box-shadow: 0 18px 46px rgba(45, 58, 78, 0.08);
    }

    .panel h3 {
      margin: 0 0 14px;
      font-size: 24px;
      color: #19283b;
    }

    .clean-list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 13px;
    }

    .clean-list li {
      position: relative;
      padding-left: 26px;
      color: #536274;
    }

    .clean-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0.72em;
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: linear-gradient(135deg, #607387, #c3ccd7);
      box-shadow: 0 0 0 5px rgba(158, 171, 187, 0.15);
    }

    .compare {
      display: grid;
      gap: 14px;
    }

    .compare-row {
      display: grid;
      grid-template-columns: 120px 1fr;
      gap: 16px;
      padding: 16px;
      border-radius: 18px;
      background: rgba(255,255,255,0.72);
      border: 1px solid rgba(213, 219, 227, 0.86);
    }

    .compare-row strong {
      color: #22344a;
    }

    .compare-row span {
      color: #5f6e80;
    }

    .steps {
      counter-reset: step;
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 16px;
    }

    .step {
      counter-increment: step;
      padding: 22px;
      border-radius: 24px;
      background: #ffffff;
      border: 1px solid rgba(176, 188, 202, 0.55);
      box-shadow: 0 12px 34px rgba(47, 64, 85, 0.08);
    }

    .step::before {
      content: counter(step);
      display: grid;
      place-items: center;
      width: 38px;
      height: 38px;
      margin-bottom: 14px;
      border-radius: 14px;
      background: linear-gradient(135deg, #26384e, #92a0b0);
      color: #ffffff;
      font-weight: 800;
    }

    .step h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #1c2b3f;
    }

    .step p {
      margin: 0;
      color: #637083;
      font-size: 15px;
    }

    .service-band {
      display: grid;
      grid-template-columns: minmax(0, 1.06fr) minmax(300px, 0.94fr);
      gap: 22px;
      align-items: center;
      padding: 24px;
      border-radius: 34px;
      background: linear-gradient(135deg, rgba(31, 52, 77, 0.96), rgba(97, 113, 132, 0.95));
      color: #ffffff;
      box-shadow: 0 24px 56px rgba(31, 52, 77, 0.2);
    }

    .service-band h2,
    .service-band h3 {
      color: #ffffff;
    }

    .service-band p,
    .service-band li {
      color: #eef3f8;
    }

    .service-photo {
      overflow: hidden;
      border-radius: 26px;
      background: #eef2f7;
      border: 1px solid rgba(255,255,255,0.35);
    }

    .service-photo img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
    }

    .link-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-top: 18px;
    }

    .link-grid a {
      padding: 13px 14px;
      border-radius: 16px;
      background: rgba(255,255,255,0.12);
      border: 1px solid rgba(255,255,255,0.2);
      color: #ffffff;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .link-grid a:hover {
      background: rgba(255,255,255,0.2);
      transform: translateY(-2px);
    }

    .guarantee {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .guarantee-item {
      padding: 22px;
      border-radius: 24px;
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(174, 185, 198, 0.52);
    }

    .guarantee-item h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #1c2b3f;
    }

    .guarantee-item p {
      margin: 0;
      color: #607083;
      font-size: 15px;
    }

    .faq-wrap {
      display: grid;
      gap: 12px;
    }

    .faq-item {
      border-radius: 20px;
      background: rgba(255,255,255,0.82);
      border: 1px solid rgba(174, 185, 198, 0.56);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #1c2b3f;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      font-size: 17px;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
    }

    .faq-question span {
      color: #69788a;
      font-size: 22px;
      line-height: 1;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.28s ease;
    }

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: #5f6e80;
    }

    .faq-item.active .faq-answer {
      max-height: 220px;
    }

    .faq-item.active .faq-question span {
      transform: rotate(45deg);
    }

    .contact-card {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 22px;
      align-items: center;
      padding: 28px;
      border-radius: 30px;
      background: linear-gradient(145deg, #ffffff, #eef2f7);
      border: 1px solid rgba(173, 185, 199, 0.58);
      box-shadow: var(--shadow);
    }

    .contact-card h2 {
      margin-top: 0;
    }

    .contact-card p {
      margin: 8px 0;
      color: #536274;
    }

    .contact-actions {
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 220px;
    }

    .site-footer {
      margin-top: 26px;
      background: #eef2f7;
      border-top: 1px solid #d7dde6;
      color: #26384e;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 24px 0;
    }

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

    .footer-links a {
      color: #344054;
      font-size: 14px;
    }

    .copyright {
      color: #667085;
      font-size: 14px;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @keyframes floatPanel {
      0%, 100% {
        transform: translateY(0);
      }
      50% {
        transform: translateY(-8px);
      }
    }

    @media (max-width: 980px) {
      .container {
        width: min(var(--container), calc(100% - 28px));
      }

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

      .nav {
        min-height: 66px;
      }

      .nav-links {
        position: absolute;
        left: 14px;
        right: 14px;
        top: 72px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 14px;
        border-radius: 22px;
        background: rgba(255,255,255,0.96);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links a {
        text-align: center;
      }

      .nav-cta {
        display: none;
      }

      .hero-grid,
      .split,
      .service-band {
        grid-template-columns: 1fr;
      }

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

      .section-head {
        display: block;
      }

      .section-head p {
        margin-top: 10px;
      }

      .contact-card {
        grid-template-columns: 1fr;
      }

      .contact-actions {
        min-width: 0;
      }
    }

    @media (max-width: 640px) {
      .hero {
        padding: 48px 0 30px;
      }

      .hero-note,
      .cards,
      .steps,
      .guarantee,
      .link-grid {
        grid-template-columns: 1fr;
      }

      .visual-panel {
        padding: 16px;
        border-radius: 26px;
      }

      .device-card {
        min-height: 300px;
      }

      .compare-row {
        grid-template-columns: 1fr;
      }

      .section {
        padding: 32px 0;
      }

      .panel,
      .card,
      .contact-card {
        padding: 22px;
      }

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