:root {
      --bg: #f5f8fb;
      --bg-soft: #eef5f8;
      --paper: #ffffff;
      --paper-blue: #f7fbfc;
      --ink: #1b2b38;
      --muted: #647887;
      --blue: #4f8fb6;
      --blue-deep: #276b93;
      --cyan: #a9d6dc;
      --gold: #c69d62;
      --line: rgba(39, 107, 147, 0.18);
      --shadow: 0 20px 60px rgba(42, 91, 120, 0.14);
      --radius-lg: 28px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --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(--ink);
      background:
        radial-gradient(circle at 12% 8%, rgba(169, 214, 220, 0.48), transparent 32%),
        radial-gradient(circle at 85% 18%, rgba(199, 221, 232, 0.7), transparent 34%),
        linear-gradient(145deg, #fbfaf5 0%, var(--bg) 42%, #edf6f7 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      opacity: 0.32;
      background-image:
        linear-gradient(115deg, rgba(255,255,255,0.28) 0 1px, transparent 1px 12px),
        radial-gradient(circle at 40% 35%, rgba(255,255,255,0.48), transparent 18%);
      mix-blend-mode: soft-light;
      z-index: -1;
    }

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

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

    .container {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(247, 251, 252, 0.86);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(39, 107, 147, 0.12);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      letter-spacing: 0.04em;
      color: var(--blue-deep);
      white-space: nowrap;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 15px;
      color: #ffffff;
      background: linear-gradient(135deg, #276b93, #78b6c8);
      box-shadow: 0 10px 24px rgba(39, 107, 147, 0.22);
      font-size: 23px;
      line-height: 1;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #315064;
      font-size: 15px;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(79, 143, 182, 0.12);
      color: var(--blue-deep);
      transform: translateY(-1px);
    }

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 18px;
      border-radius: 999px;
      background: var(--ink);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 12px 24px rgba(27, 43, 56, 0.18);
    }

    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--ink);
      font-size: 20px;
      cursor: pointer;
    }

    .hero {
      padding: 58px 0 44px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
      gap: 30px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 18px;
      padding: 7px 12px;
      border: 1px solid var(--line);
      border-radius: 999px;
      color: var(--blue-deep);
      background: rgba(255,255,255,0.7);
      font-weight: 700;
      font-size: 14px;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--gold);
      box-shadow: 0 0 0 6px rgba(198, 157, 98, 0.16);
    }

    h1 {
      margin: 0;
      max-width: 680px;
      font-size: clamp(34px, 6vw, 62px);
      line-height: 1.08;
      letter-spacing: -0.05em;
      color: #163043;
    }

    .hero-lead {
      margin: 22px 0 0;
      max-width: 650px;
      color: #476170;
      font-size: clamp(16px, 2vw, 19px);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 20px;
      border-radius: 16px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue-deep), var(--blue));
      box-shadow: 0 14px 30px rgba(39, 107, 147, 0.24);
    }

    .btn-secondary {
      color: var(--blue-deep);
      background: rgba(255,255,255,0.75);
      border-color: var(--line);
    }

    .hero-note {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
      margin-top: 28px;
      max-width: 680px;
    }

    .note-item {
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,0.66);
      border: 1px solid rgba(39, 107, 147, 0.13);
      color: #35546a;
      font-size: 14px;
    }

    .visual-card {
      position: relative;
      padding: 16px;
      border-radius: 34px;
      background: rgba(255,255,255,0.62);
      border: 1px solid rgba(255,255,255,0.85);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      inset: 18px;
      border-radius: 28px;
      background: linear-gradient(145deg, rgba(169, 214, 220, 0.34), transparent);
      z-index: 0;
    }

    .phone-frame {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1fr 0.78fr;
      gap: 12px;
      align-items: stretch;
    }

    .phone-image {
      min-height: 360px;
      border-radius: 25px;
      overflow: hidden;
      background: #eaf4f7;
      border: 1px solid rgba(39, 107, 147, 0.12);
    }

    .phone-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .side-stack {
      display: grid;
      gap: 12px;
    }

    .mini-image {
      border-radius: 22px;
      overflow: hidden;
      background: #edf6f7;
      border: 1px solid rgba(39, 107, 147, 0.12);
      aspect-ratio: 1 / 1;
    }

    .mini-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .status-tile {
      padding: 18px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid var(--line);
    }

    .status-tile strong {
      display: block;
      color: var(--blue-deep);
      font-size: 22px;
      line-height: 1.2;
      margin-bottom: 6px;
    }

    section {
      padding: 42px 0;
    }

    .section-head {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 22px;
    }

    .section-head h2 {
      margin: 0;
      color: #183344;
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.18;
      letter-spacing: -0.03em;
    }

    .section-head p {
      margin: 0;
      max-width: 540px;
      color: var(--muted);
    }

    .toc {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 16px;
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      background: rgba(255,255,255,0.66);
      box-shadow: 0 14px 40px rgba(42, 91, 120, 0.08);
    }

    .toc a {
      padding: 9px 13px;
      border-radius: 999px;
      color: #315064;
      background: rgba(238, 245, 248, 0.9);
      font-size: 14px;
      font-weight: 700;
    }

    .price-panel {
      display: grid;
      grid-template-columns: 0.92fr 1.08fr;
      gap: 18px;
      align-items: stretch;
    }

    .quote-box {
      padding: 28px;
      border-radius: var(--radius-lg);
      background: linear-gradient(145deg, #ffffff, #eef8fa);
      border: 1px solid rgba(39, 107, 147, 0.15);
      box-shadow: var(--shadow);
    }

    .quote-box h3,
    .card h3,
    .step h3,
    .service-card h3 {
      margin: 0 0 10px;
      color: #1b3e54;
      font-size: 20px;
      line-height: 1.35;
    }

    .quote-box p,
    .card p,
    .step p,
    .service-card p {
      margin: 0;
      color: var(--muted);
    }

    .factor-list {
      display: grid;
      gap: 12px;
    }

    .factor {
      padding: 18px;
      border-radius: 20px;
      background: rgba(255,255,255,0.74);
      border: 1px solid var(--line);
    }

    .factor strong {
      display: block;
      color: #1d455c;
      margin-bottom: 4px;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 16px;
    }

    .card,
    .service-card,
    .step {
      padding: 22px;
      border-radius: var(--radius-md);
      background: rgba(255,255,255,0.74);
      border: 1px solid rgba(39, 107, 147, 0.14);
      box-shadow: 0 14px 34px rgba(42, 91, 120, 0.08);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .card:hover,
    .service-card:hover,
    .step:hover {
      transform: translateY(-4px);
      border-color: rgba(79, 143, 182, 0.34);
      box-shadow: 0 20px 44px rgba(42, 91, 120, 0.13);
    }

    .service-list {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }

    .service-card {
      min-height: 150px;
      background:
        linear-gradient(150deg, rgba(255,255,255,0.92), rgba(239,247,249,0.76)),
        radial-gradient(circle at 20% 10%, rgba(169,214,220,0.36), transparent 42%);
    }

    .tag {
      display: inline-flex;
      margin-bottom: 12px;
      padding: 5px 10px;
      border-radius: 999px;
      color: var(--blue-deep);
      background: rgba(79, 143, 182, 0.12);
      font-size: 13px;
      font-weight: 800;
    }

    .steps {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
      counter-reset: step;
    }

    .step {
      position: relative;
      overflow: hidden;
    }

    .step::before {
      counter-increment: step;
      content: counter(step);
      position: absolute;
      right: 18px;
      top: 12px;
      color: rgba(79, 143, 182, 0.14);
      font-size: 54px;
      font-weight: 900;
      line-height: 1;
    }

    .warranty {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .warranty-item {
      padding: 18px;
      border-radius: 18px;
      background: rgba(255,255,255,0.72);
      border: 1px solid var(--line);
    }

    .warranty-item strong {
      display: block;
      margin-bottom: 6px;
      color: #1d455c;
    }

    .contact-panel {
      display: grid;
      grid-template-columns: 1fr 0.8fr;
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 28px;
      border-radius: var(--radius-lg);
      background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(236,247,249,0.82));
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .info-list {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .info-row {
      display: grid;
      grid-template-columns: 96px 1fr;
      gap: 12px;
      padding: 13px 0;
      border-bottom: 1px solid rgba(39, 107, 147, 0.12);
    }

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

    .info-row span {
      color: var(--muted);
    }

    .info-row strong,
    .info-row a {
      color: #1d455c;
      font-weight: 800;
    }

    .qr-card {
      display: grid;
      gap: 14px;
      padding: 22px;
      border-radius: var(--radius-lg);
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: 0 14px 36px rgba(42, 91, 120, 0.08);
      align-content: start;
    }

    .qr-box {
      padding: 12px;
      border-radius: 20px;
      background: #f2f8fa;
      border: 1px solid rgba(39, 107, 147, 0.12);
    }

    .qr-box img {
      width: 100%;
      border-radius: 14px;
      object-fit: contain;
      background: #ffffff;
    }

    .map-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 16px;
      border-radius: 14px;
      color: #ffffff;
      background: var(--blue-deep);
      font-weight: 800;
      text-align: center;
    }

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

    details {
      padding: 18px 20px;
      border-radius: 18px;
      background: rgba(255,255,255,0.76);
      border: 1px solid var(--line);
      box-shadow: 0 10px 30px rgba(42, 91, 120, 0.06);
    }

    summary {
      cursor: pointer;
      color: #1b3e54;
      font-weight: 800;
      list-style: none;
    }

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

    details p {
      margin: 10px 0 0;
      color: var(--muted);
    }

    .related {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 18px;
      border-radius: var(--radius-md);
      background: rgba(255,255,255,0.66);
      border: 1px solid var(--line);
    }

    .related a {
      padding: 9px 12px;
      border-radius: 999px;
      background: rgba(79, 143, 182, 0.1);
      color: #255f82;
      font-size: 14px;
      font-weight: 700;
    }

    .site-footer {
      margin-top: 22px;
      background: #173143;
      color: #eaf4f7;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 24px 0;
    }

    .footer-inner a {
      color: #d7edf2;
      font-weight: 700;
    }

    .footer-note {
      color: #b9ced7;
      font-size: 14px;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      animation: rise 0.72s ease forwards;
    }

    .delay-1 {
      animation-delay: 0.12s;
    }

    .delay-2 {
      animation-delay: 0.22s;
    }

    @keyframes rise {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 980px) {
      .nav-links,
      .nav-action {
        display: none;
      }

      .menu-toggle {
        display: inline-grid;
        place-items: center;
      }

      .nav-links.is-open {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 74px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        padding: 12px;
        background: #ffffff;
        border: 1px solid var(--line);
        border-radius: 20px;
        box-shadow: var(--shadow);
      }

      .hero-grid,
      .price-panel,
      .contact-panel {
        grid-template-columns: 1fr;
      }

      .hero {
        padding-top: 40px;
      }

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

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

      .section-head {
        display: block;
      }

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

    @media (max-width: 640px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      .nav {
        min-height: 66px;
      }

      .hero-note,
      .phone-frame,
      .service-list,
      .steps,
      .warranty {
        grid-template-columns: 1fr;
      }

      .phone-image {
        min-height: 260px;
      }

      .mini-image {
        aspect-ratio: 16 / 10;
      }

      section {
        padding: 32px 0;
      }

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

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

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

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.001ms !important;
      }
    }