:root{
      --navy:#102b3e;
      --navy-2:#173d55;
      --teal:#198f91;
      --teal-soft:#e8f6f5;
      --blue-soft:#edf5fa;
      --ice:#f6fafc;
      --white:#ffffff;
      --text:#263944;
      --muted:#677984;
      --border:#dce8ed;
      --shadow:0 18px 50px rgba(28,67,87,.10);
      --radius:24px;
    }

    *{
      box-sizing:border-box;
    }

    html{
      scroll-behavior:smooth;
    }

    body{
      margin:0;
      background:#fff;
      color:var(--text);
      font-family:Arial, Helvetica, sans-serif;
      line-height:1.75;
      -webkit-font-smoothing:antialiased;
    }

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

    a{
      color:var(--teal);
      text-decoration:none;
    }

    a:hover{
      text-decoration:underline;
    }

    .rf-page{
      overflow:hidden;
    }

    .rf-container{
      width:min(1180px, calc(100% - 40px));
      margin:0 auto;
    }

    .rf-hero{
      position:relative;
      padding:90px 0 70px;
      background:
        radial-gradient(circle at 85% 15%, rgba(40,164,164,.16), transparent 30%),
        linear-gradient(135deg,#f8fcfd 0%,#ffffff 48%,#eef8f8 100%);
      border-bottom:1px solid var(--border);
    }

    .rf-hero:after{
      content:"";
      position:absolute;
      width:520px;
      height:520px;
      right:-220px;
      bottom:-290px;
      border:1px solid rgba(25,143,145,.12);
      border-radius:50%;
    }

    .rf-label{
      display:inline-flex;
      align-items:center;
      gap:10px;
      margin-bottom:24px;
      color:var(--teal);
      font-size:13px;
      font-weight:700;
      letter-spacing:2px;
      text-transform:uppercase;
    }

    .rf-label:before{
      content:"";
      width:42px;
      height:2px;
      background:var(--teal);
    }

    .rf-hero h1{
      max-width:900px;
      margin:0;
      color:var(--navy);
      font-family:Georgia,"Times New Roman",serif;
      font-size:clamp(42px,6vw,72px);
      line-height:1.08;
      letter-spacing:-2px;
    }

    .rf-hero h1 span{
      color:var(--teal);
    }

    .rf-lead{
      max-width:800px;
      margin:28px 0 0;
      font-size:19px;
      color:#516773;
    }

    .rf-answer{
      max-width:950px;
      margin:-1px auto 0;
      position:relative;
      z-index:2;
      transform:translateY(42px);
      background:var(--navy);
      color:#fff;
      border-radius:var(--radius);
      padding:34px 40px;
      box-shadow:var(--shadow);
    }

    .rf-answer small{
      display:block;
      margin-bottom:8px;
      color:#73d6d0;
      font-weight:700;
      letter-spacing:1.4px;
      text-transform:uppercase;
    }

    .rf-answer strong{
      display:block;
      margin-bottom:8px;
      font-size:24px;
    }

    .rf-answer p{
      margin:0;
      color:#dce9ef;
    }

    .rf-main{
      padding:100px 0 80px;
    }

    .rf-layout{
      display:grid;
      grid-template-columns:250px minmax(0,1fr);
      gap:55px;
      align-items:start;
    }

    .rf-toc{
      position:sticky;
      top:30px;
      padding:25px;
      background:var(--ice);
      border:1px solid var(--border);
      border-radius:20px;
    }

    .rf-toc-title{
      margin:0 0 15px;
      color:var(--navy);
      font-weight:700;
    }

    .rf-toc a{
      display:block;
      padding:9px 0;
      color:#526d7b;
      font-size:14px;
      border-bottom:1px solid #e3edef;
    }

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

    .rf-article h2{
      margin:70px 0 20px;
      color:var(--navy);
      font-family:Georgia,"Times New Roman",serif;
      font-size:38px;
      line-height:1.2;
    }

    .rf-article h2:first-child{
      margin-top:0;
    }

    .rf-article h3{
      margin:34px 0 12px;
      color:var(--navy);
      font-size:23px;
      line-height:1.35;
    }

    .rf-article p{
      margin:0 0 20px;
      font-size:17px;
    }

    .rf-highlight{
      margin:30px 0;
      padding:28px 30px;
      background:var(--teal-soft);
      border-left:4px solid var(--teal);
      border-radius:0 18px 18px 0;
    }

    .rf-highlight strong{
      color:var(--navy);
    }

    .rf-figure{
      margin:42px 0;
      padding:12px;
      background:#fff;
      border:1px solid var(--border);
      border-radius:26px;
      box-shadow:var(--shadow);
    }

    .rf-figure img{
      width:100%;
      border-radius:17px;
    }

    .rf-caption{
      padding:12px 8px 3px;
      color:var(--muted);
      font-size:13px;
      text-align:center;
    }

    .rf-definition-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:20px;
      margin:30px 0;
    }

    .rf-definition-card{
      padding:30px;
      border-radius:22px;
      border:1px solid var(--border);
      background:#fff;
    }

    .rf-definition-card:first-child{
      border-top:4px solid var(--navy);
    }

    .rf-definition-card:last-child{
      border-top:4px solid var(--teal);
    }

    .rf-definition-card .num{
      color:var(--teal);
      font-weight:800;
      font-size:13px;
      letter-spacing:1px;
    }

    .rf-definition-card h3{
      margin:8px 0 12px;
    }

    .rf-compare{
      margin:35px 0;
      overflow:hidden;
      border:1px solid var(--border);
      border-radius:22px;
    }

    .rf-table-scroll{
      overflow-x:auto;
    }

    .rf-compare table{
      width:100%;
      min-width:700px;
      border-collapse:collapse;
      background:#fff;
    }

    .rf-compare th{
      padding:18px;
      background:var(--navy);
      color:#fff;
      text-align:left;
      font-size:14px;
    }

    .rf-compare td{
      padding:18px;
      border-bottom:1px solid var(--border);
      vertical-align:top;
      font-size:15px;
    }

    .rf-compare tr:last-child td{
      border-bottom:0;
    }

    .rf-compare td:first-child{
      width:25%;
      color:var(--navy);
      font-weight:700;
    }

    .rf-process{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:18px;
      margin:32px 0;
    }

    .rf-step{
      position:relative;
      padding:26px;
      background:var(--ice);
      border-radius:20px;
      border:1px solid var(--border);
    }

    .rf-step span{
      display:flex;
      align-items:center;
      justify-content:center;
      width:40px;
      height:40px;
      margin-bottom:18px;
      border-radius:50%;
      background:var(--teal);
      color:#fff;
      font-weight:800;
    }

    .rf-step h3{
      margin:0 0 8px;
      font-size:19px;
    }

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

    .rf-check-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:16px;
      margin:30px 0;
    }

    .rf-check{
      padding:20px 22px;
      border:1px solid var(--border);
      border-radius:17px;
      background:#fff;
    }

    .rf-check strong{
      display:block;
      color:var(--navy);
      margin-bottom:5px;
    }

    .rf-clinic-box{
      margin:50px 0;
      padding:42px;
      border-radius:26px;
      background:
        linear-gradient(135deg,rgba(16,43,62,.98),rgba(22,89,98,.98));
      color:#fff;
    }

    .rf-clinic-box h2{
      margin:0 0 15px;
      color:#fff;
    }

    .rf-clinic-box p{
      color:#d9e8eb;
    }

    .rf-btn{
      display:inline-flex;
      align-items:center;
      gap:10px;
      margin-top:10px;
      padding:14px 24px;
      border-radius:999px;
      background:#fff;
      color:var(--navy);
      font-weight:700;
      transition:.2s ease;
    }

    .rf-btn:hover{
      text-decoration:none;
      transform:translateY(-2px);
    }

    .rf-faq{
      margin-top:35px;
    }

    .rf-faq-item{
      margin-bottom:14px;
      padding:0 25px;
      border:1px solid var(--border);
      border-radius:18px;
      background:#fff;
    }

    .rf-faq-item details{
      padding:20px 0;
    }

    .rf-faq-item summary{
      cursor:pointer;
      color:var(--navy);
      font-weight:700;
      font-size:17px;
    }

    .rf-faq-item p{
      margin:14px 0 0;
      color:var(--muted);
      font-size:15px;
    }

    .rf-references{
      margin-top:60px;
      padding-top:35px;
      border-top:1px solid var(--border);
    }

    .rf-references h2{
      margin-top:0;
      font-size:28px;
    }

    .rf-references ol{
      padding-left:22px;
    }

    .rf-references li{
      margin-bottom:12px;
      color:var(--muted);
      font-size:14px;
    }

    .rf-disclaimer{
      margin-top:40px;
      padding:22px 24px;
      background:#f7f8f9;
      border-radius:15px;
      color:#687983;
      font-size:13px;
    }

    @media(max-width:900px){
      .rf-layout{
        grid-template-columns:1fr;
      }

      .rf-toc{
        position:static;
      }

      .rf-definition-grid,
      .rf-process,
      .rf-check-grid{
        grid-template-columns:1fr;
      }
    }

    @media(max-width:600px){
      .rf-container{
        width:min(100% - 28px,1180px);
      }

      .rf-hero{
        padding:60px 0 55px;
      }

      .rf-hero h1{
        font-size:40px;
      }

      .rf-lead{
        font-size:17px;
      }

      .rf-answer{
        margin-left:14px;
        margin-right:14px;
        padding:28px 25px;
      }

      .rf-main{
        padding-top:85px;
      }

      .rf-article h2{
        font-size:31px;
      }

      .rf-clinic-box{
        padding:30px 25px;
      }
    }