:root {
      --bg: #f5f9fb;
      --bg-soft: #eef5f8;
      --card: #ffffff;
      --card-ice: rgba(255, 255, 255, 0.78);
      --text: #1d2b33;
      --muted: #61727d;
      --line: #d7e5eb;
      --primary: #2b7188;
      --primary-dark: #1f5668;
      --accent: #9ccbd6;
      --pale: #e7f1f5;
      --shadow: 0 18px 46px rgba(43, 113, 136, 0.13);
      --radius-lg: 28px;
      --radius-md: 18px;
      --container: 1120px;
    }

    * {
      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 12% 8%, rgba(198, 226, 233, 0.74), transparent 32%),
        radial-gradient(circle at 90% 12%, rgba(222, 239, 244, 0.92), transparent 30%),
        linear-gradient(180deg, #f8fcfd 0%, #eef6f8 48%, #f7fbfc 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    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(248, 252, 253, 0.86);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(215, 229, 235, 0.8);
    }

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

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      flex: 0 0 auto;
    }

    .logo {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: #143944;
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(145deg, #ffffff, #d8edf3);
      border: 1px solid rgba(126, 174, 187, 0.45);
      box-shadow: 0 10px 24px rgba(43, 113, 136, 0.16);
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.25;
    }

    .brand-title {
      font-weight: 800;
      letter-spacing: 0.02em;
      color: #142b34;
    }

    .brand-sub {
      font-size: 12px;
      color: var(--muted);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-left: auto;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #31434c;
      font-size: 14px;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
      background: var(--pale);
      color: var(--primary-dark);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      background: #173d4a;
      color: #ffffff;
      font-size: 14px;
      font-weight: 700;
      box-shadow: 0 12px 24px rgba(31, 86, 104, 0.18);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(31, 86, 104, 0.24);
    }

    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: #ffffff;
      color: var(--text);
      border-radius: 12px;
      padding: 8px 10px;
      font-size: 15px;
      cursor: pointer;
    }

    main {
      position: relative;
    }

    .hero {
      padding: 58px 0 34px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid rgba(126, 174, 187, 0.45);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.62);
      color: #2b6171;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(43, 113, 136, 0.08);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 0 5px rgba(43, 113, 136, 0.12);
    }

    h1 {
      margin: 18px 0 14px;
      font-size: clamp(32px, 6vw, 54px);
      line-height: 1.1;
      letter-spacing: -0.04em;
      color: #132831;
    }

    .hero-lead {
      max-width: 690px;
      margin: 0;
      color: #40545e;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 26px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 44px;
      padding: 12px 18px;
      border-radius: 14px;
      font-weight: 800;
      border: 1px solid transparent;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, #1f5668, #2d8298);
      box-shadow: 0 16px 30px rgba(43, 113, 136, 0.24);
    }

    .btn-secondary {
      color: #21434f;
      background: rgba(255, 255, 255, 0.72);
      border-color: rgba(126, 174, 187, 0.45);
    }

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

    .hero-note {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 30px;
      max-width: 650px;
    }

    .note-item {
      padding: 12px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.62);
      border: 1px solid rgba(215, 229, 235, 0.9);
      color: #3f535c;
      font-size: 13px;
    }

    .visual-card {
      position: relative;
      padding: 16px;
      border-radius: var(--radius-lg);
      background: linear-gradient(150deg, rgba(255,255,255,0.86), rgba(230,242,246,0.78));
      border: 1px solid rgba(215, 229, 235, 0.95);
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatIn 0.8s ease both;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      width: 180px;
      height: 180px;
      right: -70px;
      top: -70px;
      background: radial-gradient(circle, rgba(156, 203, 214, 0.45), transparent 68%);
      pointer-events: none;
    }

    .image-shell {
      position: relative;
      aspect-ratio: 4 / 3;
      border-radius: 22px;
      overflow: hidden;
      background: #e8f2f5;
      border: 1px solid rgba(126, 174, 187, 0.26);
    }

    .image-shell img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      background: #f3f8fa;
    }

    .diagnose-panel {
      margin-top: 14px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }

    .mini-card {
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(215, 229, 235, 0.92);
    }

    .mini-card strong {
      display: block;
      color: #18313a;
      font-size: 15px;
      margin-bottom: 4px;
    }

    .mini-card span {
      color: var(--muted);
      font-size: 13px;
    }

    section {
      padding: 34px 0;
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 20px;
    }

    .section-kicker {
      margin: 0 0 6px;
      color: var(--primary);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    h2 {
      margin: 0;
      color: #172d36;
      font-size: clamp(24px, 4vw, 36px);
      line-height: 1.25;
      letter-spacing: -0.03em;
    }

    .section-desc {
      max-width: 440px;
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .panel {
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(215, 229, 235, 0.95);
      box-shadow: 0 14px 34px rgba(43, 113, 136, 0.08);
    }

    .answer-panel {
      padding: 24px;
      display: grid;
      grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
      gap: 24px;
      align-items: start;
    }

    .answer-box {
      padding: 22px;
      border-radius: 22px;
      background: linear-gradient(160deg, #eaf5f7, #ffffff);
      border: 1px solid rgba(126, 174, 187, 0.35);
    }

    .answer-box h3,
    .service-card h3,
    .about-card h3,
    .faq-question h3 {
      margin: 0 0 8px;
      color: #17313b;
      font-size: 19px;
    }

    .answer-box p,
    .service-card p,
    .about-card p {
      margin: 0;
      color: #526670;
      font-size: 15px;
    }

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

    .cost-list li {
      display: grid;
      grid-template-columns: 28px 1fr;
      gap: 12px;
      align-items: start;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.68);
      border: 1px solid rgba(215, 229, 235, 0.9);
    }

    .cost-list span {
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 10px;
      background: #dceff4;
      color: #1f5668;
      font-weight: 900;
      font-size: 13px;
    }

    .cost-list strong {
      display: block;
      margin-bottom: 2px;
      color: #18313a;
    }

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

    .about-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .about-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(215, 229, 235, 0.95);
      transition: transform 0.22s ease, box-shadow 0.22s ease;
    }

    .about-card:hover,
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 38px rgba(43, 113, 136, 0.12);
    }

    .about-icon {
      width: 40px;
      height: 40px;
      margin-bottom: 14px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      background: #e2f0f4;
      color: #1f5668;
      font-weight: 900;
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: 0.82fr 1.18fr;
      gap: 18px;
      align-items: start;
    }

    .steps {
      padding: 22px;
    }

    .steps ol {
      margin: 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 12px;
      counter-reset: step;
    }

    .steps li {
      position: relative;
      padding: 14px 14px 14px 50px;
      border-radius: 18px;
      background: rgba(255,255,255,0.68);
      border: 1px solid rgba(215, 229, 235, 0.88);
      color: #4b5f68;
      font-size: 15px;
    }

    .steps li::before {
      counter-increment: step;
      content: counter(step);
      position: absolute;
      left: 14px;
      top: 14px;
      width: 24px;
      height: 24px;
      display: grid;
      place-items: center;
      border-radius: 9px;
      background: #1f5668;
      color: #ffffff;
      font-size: 12px;
      font-weight: 900;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .service-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(215, 229, 235, 0.95);
      transition: transform 0.22s ease, box-shadow 0.22s ease;
    }

    .service-card ul {
      margin: 12px 0 0;
      padding-left: 18px;
      color: #536873;
      font-size: 14px;
    }

    .guarantee-band {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      padding: 20px;
    }

    .guarantee-item {
      padding: 16px;
      border-radius: 20px;
      background: linear-gradient(180deg, #ffffff, #edf6f8);
      border: 1px solid rgba(215, 229, 235, 0.9);
    }

    .guarantee-item strong {
      display: block;
      color: #18313a;
      margin-bottom: 6px;
    }

    .guarantee-item span {
      color: var(--muted);
      font-size: 13px;
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.74);
      border: 1px solid rgba(215, 229, 235, 0.95);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      text-align: left;
      cursor: pointer;
      color: var(--text);
    }

    .faq-question h3 {
      font-size: 16px;
      margin: 0;
    }

    .faq-icon {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 10px;
      background: #e4f1f5;
      color: #1f5668;
      font-weight: 900;
      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: #526670;
      font-size: 15px;
    }

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

    .links-panel {
      padding: 22px;
    }

    .links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 14px;
    }

    .links-grid a {
      padding: 13px 14px;
      border-radius: 16px;
      color: #24434e;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(215, 229, 235, 0.95);
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .links-grid a:hover {
      background: #e7f3f6;
      transform: translateY(-2px);
    }

    .location-card {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 18px;
      align-items: center;
      padding: 24px;
      background:
        linear-gradient(135deg, rgba(255,255,255,0.82), rgba(232,243,247,0.88));
    }

    .location-card p {
      margin: 6px 0 0;
      color: var(--muted);
    }

    .site-footer {
      margin-top: 18px;
      background: #edf6f8;
      border-top: 1px solid #d5e5eb;
      color: #1d2b33;
    }

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

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .footer-brand .logo {
      width: 36px;
      height: 36px;
      font-size: 20px;
      box-shadow: none;
    }

    .footer-text strong {
      display: block;
      color: #172d36;
    }

    .footer-text span,
    .footer-links {
      color: #526670;
      font-size: 13px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: flex-end;
    }

    .footer-links a {
      color: #24434e;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.55s ease, transform 0.55s ease;
    }

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

    @keyframes floatIn {
      from {
        opacity: 0;
        transform: translateY(18px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    @media (max-width: 920px) {
      .menu-toggle {
        display: inline-flex;
        align-items: center;
      }

      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 72px;
        padding: 12px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        background: rgba(255, 255, 255, 0.96);
        border: 1px solid var(--line);
        border-radius: 20px;
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        padding: 12px 14px;
      }

      .nav-cta {
        display: none;
      }

      .hero-grid,
      .answer-panel,
      .solution-wrap,
      .location-card {
        grid-template-columns: 1fr;
      }

      .about-grid,
      .guarantee-band {
        grid-template-columns: repeat(2, 1fr);
      }

      .section-head {
        align-items: flex-start;
        flex-direction: column;
      }

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

    @media (max-width: 620px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      .hero {
        padding-top: 36px;
      }

      .hero-note,
      .diagnose-panel,
      .about-grid,
      .service-grid,
      .guarantee-band,
      .links-grid {
        grid-template-columns: 1fr;
      }

      .answer-panel,
      .links-panel,
      .location-card {
        padding: 18px;
      }

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

      .footer-links {
        justify-content: flex-start;
      }
    }