:root {
      --bg: #f4fbfb;
      --bg-soft: #e9f7f6;
      --card: #ffffff;
      --card-tint: #f8ffff;
      --text: #20313a;
      --muted: #65777f;
      --primary: #18a7b5;
      --primary-dark: #087d91;
      --accent: #89d8cf;
      --ice: #dff8f6;
      --line: rgba(20, 125, 145, 0.16);
      --shadow: 0 18px 44px rgba(22, 118, 136, 0.12);
      --radius-lg: 28px;
      --radius-md: 20px;
      --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(137, 216, 207, 0.36), transparent 34%),
        radial-gradient(circle at 88% 18%, rgba(24, 167, 181, 0.14), transparent 30%),
        linear-gradient(180deg, #f7fdfc 0%, var(--bg) 48%, #ffffff 100%);
      line-height: 1.65;
    }

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

    button {
      font: inherit;
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(247, 253, 252, 0.88);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--line);
    }

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

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      color: #16363d;
      letter-spacing: 0.02em;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      background: linear-gradient(135deg, #ffffff, #bfece8);
      border: 1px solid rgba(24, 167, 181, 0.28);
      box-shadow: 0 10px 24px rgba(24, 167, 181, 0.16);
      color: var(--primary-dark);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 6px;
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .nav-links a {
      display: inline-flex;
      align-items: center;
      min-height: 40px;
      padding: 0 12px;
      border-radius: 999px;
      color: #31505a;
      font-size: 15px;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(24, 167, 181, 0.1);
      color: var(--primary-dark);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 18px;
      border-radius: 999px;
      background: #173f49;
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 12px 28px rgba(23, 63, 73, 0.16);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 34px rgba(23, 63, 73, 0.2);
    }

    .menu-btn {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--text);
      cursor: pointer;
    }

    main {
      overflow: hidden;
    }

    section {
      scroll-margin-top: 88px;
    }

    .hero {
      padding: 64px 0 40px;
    }

    .hero-panel {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
      gap: 28px;
      align-items: stretch;
      padding: 34px;
      border: 1px solid var(--line);
      border-radius: 36px;
      background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(229, 250, 248, 0.82)),
        radial-gradient(circle at 84% 18%, rgba(137, 216, 207, 0.42), transparent 34%);
      box-shadow: var(--shadow);
      position: relative;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      width: fit-content;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(24, 167, 181, 0.1);
      color: var(--primary-dark);
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 0 6px rgba(24, 167, 181, 0.12);
    }

    h1 {
      margin: 0;
      max-width: 720px;
      color: #15313a;
      font-size: clamp(32px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.04em;
    }

    .hero-text {
      margin: 20px 0 0;
      max-width: 680px;
      color: #4b6670;
      font-size: 18px;
    }

    .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: 999px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      box-shadow: 0 14px 30px rgba(24, 167, 181, 0.24);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.76);
      color: #1f4f59;
      border-color: var(--line);
    }

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

    .hero-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 100%;
      padding: 24px;
      border-radius: 28px;
      background: linear-gradient(180deg, #ffffff, #edfafa);
      border: 1px solid rgba(24, 167, 181, 0.18);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }

    .diagnosis-title {
      margin: 0 0 16px;
      font-size: 20px;
      color: #15313a;
    }

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

    .signal-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: rgba(244, 251, 251, 0.92);
      border: 1px solid rgba(24, 167, 181, 0.1);
      color: #38545d;
    }

    .signal-list span {
      flex: 0 0 auto;
      width: 22px;
      height: 22px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: var(--ice);
      color: var(--primary-dark);
      font-weight: 900;
      font-size: 13px;
    }

    .ice-strip {
      margin-top: 18px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .ice-strip div {
      padding: 12px 10px;
      border-radius: 16px;
      background: #e7f8f6;
      text-align: center;
      color: #245762;
      font-size: 14px;
      font-weight: 800;
    }

    .section-block {
      padding: 34px 0;
    }

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

    .section-kicker {
      margin: 0 0 8px;
      color: var(--primary-dark);
      font-weight: 800;
      letter-spacing: 0.08em;
      font-size: 13px;
    }

    h2 {
      margin: 0;
      color: #17343d;
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.2;
      letter-spacing: -0.03em;
    }

    .section-desc {
      max-width: 460px;
      margin: 0;
      color: var(--muted);
    }

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

    .service-card {
      padding: 22px;
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      box-shadow: 0 14px 34px rgba(30, 118, 132, 0.08);
      transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: rgba(24, 167, 181, 0.38);
      box-shadow: 0 18px 42px rgba(30, 118, 132, 0.14);
    }

    .service-icon {
      width: 46px;
      height: 46px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      margin-bottom: 14px;
      background: linear-gradient(135deg, #dff8f6, #ffffff);
      color: var(--primary-dark);
      font-weight: 900;
      font-size: 20px;
    }

    h3 {
      margin: 0 0 8px;
      color: #17343d;
      font-size: 20px;
      line-height: 1.35;
    }

    .service-card p,
    .solution-text p,
    .guarantee-card p,
    .contact-panel p {
      margin: 0;
      color: var(--muted);
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: 0.88fr 1.12fr;
      gap: 18px;
      align-items: start;
    }

    .solution-note {
      padding: 24px;
      border-radius: var(--radius-lg);
      background: linear-gradient(160deg, #173f49, #286d76);
      color: #ffffff;
      box-shadow: 0 18px 40px rgba(23, 63, 73, 0.18);
    }

    .solution-note h2,
    .solution-note p {
      color: #ffffff;
    }

    .solution-note p {
      margin-top: 12px;
      opacity: 0.88;
    }

    .step-list {
      display: grid;
      gap: 12px;
      margin-top: 22px;
    }

    .step {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 13px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.22);
    }

    .step strong {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 10px;
      background: #ffffff;
      color: var(--primary-dark);
    }

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

    .solution-text {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
    }

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

    .guarantee-card {
      padding: 20px;
      border-radius: 22px;
      background: linear-gradient(180deg, #ffffff, #f2fbfa);
      border: 1px solid var(--line);
    }

    .guarantee-card strong {
      display: block;
      margin-bottom: 8px;
      color: #17343d;
      font-size: 18px;
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.86);
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #17343d;
      text-align: left;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question span {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: var(--ice);
      color: var(--primary-dark);
      transition: transform 0.2s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      color: var(--muted);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

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

    .contact-panel {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 22px;
      align-items: center;
      padding: 28px;
      border-radius: 30px;
      background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(223, 248, 246, 0.92)),
        radial-gradient(circle at 78% 26%, rgba(24, 167, 181, 0.18), transparent 30%);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

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

    .site-footer {
      margin-top: 26px;
      background: #e9f7f6;
      border-top: 1px solid var(--line);
      color: #2d4e57;
    }

    .footer-inner {
      min-height: 86px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 20px 0;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      color: #31505a;
      font-size: 14px;
    }

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

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

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

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

    @media (max-width: 900px) {
      .menu-btn {
        display: inline-grid;
        place-items: center;
      }

      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 72px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        border-radius: 22px;
        background: #ffffff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        justify-content: center;
      }

      .nav-cta {
        display: none;
      }

      .hero {
        padding-top: 36px;
      }

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

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

      .contact-actions {
        justify-content: flex-start;
      }
    }

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

      .nav {
        min-height: 66px;
      }

      .nav-links {
        top: 66px;
      }

      .hero-panel {
        padding: 22px;
        border-radius: 28px;
      }

      .hero-text {
        font-size: 16px;
      }

      .section-block {
        padding: 28px 0;
      }

      .section-head {
        display: block;
      }

      .section-desc {
        margin-top: 10px;
      }

      .service-grid,
      .solution-grid,
      .guarantee {
        grid-template-columns: 1fr;
      }

      .ice-strip {
        grid-template-columns: 1fr;
      }

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