:root{
    --navy:#12131c; --teal:#1f9c93; --teal-light:#2cc0b5; --purple:#6d2f8f; --purple-light:#9457bd;
    --text-dark:#1c1c28; --text-gray:#59596a; --text-gray-soft:#7b7b8c;
    --bg-light:#f6f6f9; --bg-white:#ffffff; --border:#e8e8ee;
    --grad: linear-gradient(135deg, var(--teal-light), var(--purple));
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{font-family:'Inter', system-ui, sans-serif; color:var(--text-dark); background:var(--bg-white); line-height:1.7; -webkit-font-smoothing:antialiased;}
  h1,h2,h3,h4{font-family:'Poppins', sans-serif; font-weight:700; letter-spacing:-0.01em; color:var(--text-dark);}
  a{color:var(--purple);}
  .demo-flag{background:#fff7e6; color:#8a6300; font-size:13px; text-align:center; padding:8px 16px; border-bottom:1px solid #f0dca3;}

  .site-header{position:sticky; top:0; z-index:60; background:rgba(255,255,255,0.94); backdrop-filter:blur(8px); border-bottom:1px solid var(--border);}
  .nav{display:flex; align-items:center; justify-content:space-between; padding:18px 32px; max-width:1200px; margin:0 auto;}
  .logo{display:flex; align-items:center; gap:12px; font-family:'Poppins',sans-serif; font-weight:700; font-size:21px; text-decoration:none; color:var(--text-dark);}
  .logo .mark{width:34px; height:34px; border-radius:50%; background: conic-gradient(from 200deg, #22c1b8, #2f6fd6 35%, #6d2f8f 70%, #22c1b8 100%);}
  nav.links{display:flex; gap:22px; font-size:13.5px; font-weight:500; color:var(--text-gray);}
  nav.links a{text-decoration:none;}
  nav.links a.active{color:var(--purple); font-weight:600;}
  .cta{display:inline-flex; align-items:center; gap:8px; background:var(--teal); color:#fff; font-weight:600; font-size:13.5px; padding:10px 20px; border-radius:8px; text-decoration:none;}

  /* ---------- hero ---------- */
  .hero{
    position:relative; overflow:hidden; color:#fff; padding:70px 32px 64px;
    background:
      radial-gradient(ellipse at 15% 20%, rgba(34,193,184,0.28), transparent 55%),
      radial-gradient(ellipse at 85% 20%, rgba(109,47,143,0.38), transparent 55%),
      linear-gradient(160deg, #0c0d15 0%, #14162a 55%, #1a1330 100%);
  }
  .hero-inner{max-width:900px; margin:0 auto; text-align:center; position:relative;}
  .eyebrow{display:inline-block; font-size:12.5px; letter-spacing:0.14em; text-transform:uppercase; color:#bcb6ff; font-weight:600; margin-bottom:20px; border:1px solid rgba(255,255,255,0.25); padding:6px 16px; border-radius:999px;}
  .hero h1{font-size:clamp(28px, 4.2vw, 44px); line-height:1.2; margin-bottom:18px;}
  .hero p.lede{font-size:17px; color:#cfcbe6; max-width:680px; margin:0 auto 8px;}
  .meta-row{display:flex; gap:20px; justify-content:center; flex-wrap:wrap; margin-top:26px; font-size:13px; color:#a29dc4;}
  .meta-row span{display:flex; align-items:center; gap:6px;}
  .meta-dot{width:5px; height:5px; border-radius:50%; background:var(--teal-light);}

  /* ---------- layout ---------- */
  .layout{max-width:1200px; margin:0 auto; display:grid; grid-template-columns:240px 1fr; gap:56px; padding:56px 32px 30px;}
  .toc{position:sticky; top:90px; align-self:start; font-size:13.5px;}
  .toc .toc-label{font-size:11.5px; text-transform:uppercase; letter-spacing:0.08em; color:var(--text-gray-soft); font-weight:700; margin-bottom:14px;}
  .toc ol{list-style:none; display:grid; gap:2px; counter-reset:toc;}
  .toc li{counter-increment:toc;}
  .toc a{
    display:flex; gap:10px; text-decoration:none; color:var(--text-gray); padding:8px 10px; border-radius:8px;
    border-left:2px solid transparent; font-weight:500; transition:all .15s;
  }
  .toc a::before{content:counter(toc, decimal-leading-zero); color:var(--purple-light); font-family:'Poppins',sans-serif; font-weight:700; font-size:11.5px; flex:0 0 auto; padding-top:1px;}
  .toc a:hover, .toc a.active{color:var(--text-dark); background:var(--bg-light); border-left-color:var(--purple);}

  main{min-width:0;}
  section.chapter{padding-bottom:64px; border-bottom:1px solid var(--border); margin-bottom:56px; scroll-margin-top:90px;}
  section.chapter:last-of-type{border-bottom:none;}
  .chapter-kicker{font-size:12px; letter-spacing:0.1em; text-transform:uppercase; font-weight:700; color:var(--purple); margin-bottom:10px;}
  .chapter h2{font-size:clamp(22px,2.6vw,30px); margin-bottom:18px;}
  main p{font-size:15.5px; color:var(--text-gray); margin-bottom:16px; max-width:720px;}
  main strong{color:var(--text-dark);}
  .drop{font-family:'Source Serif 4', serif; font-size:19px; color:var(--text-dark); line-height:1.7; margin-bottom:20px; max-width:720px;}

  /* intro */
  .intro-lead{font-size:18px; color:var(--text-dark); max-width:760px;}

  /* comparison table */
  .table-scroll{overflow-x:auto; margin:28px 0 8px; border:1px solid var(--border); border-radius:14px;}
  table.compare{width:100%; border-collapse:collapse; font-size:13.5px; min-width:760px;}
  table.compare th{
    text-align:left; padding:14px 16px; background:var(--bg-light); font-family:'Poppins',sans-serif; font-weight:600;
    font-size:12px; text-transform:uppercase; letter-spacing:0.03em; color:var(--text-gray-soft); border-bottom:1px solid var(--border);
  }
  table.compare td{padding:14px 16px; border-bottom:1px solid var(--border); color:var(--text-gray); vertical-align:top;}
  table.compare tr:last-child td{border-bottom:none;}
  table.compare td.name{font-family:'Poppins',sans-serif; font-weight:600; color:var(--text-dark); white-space:nowrap;}

  /* risk spectrum */
  .spectrum-wrap{margin:36px 0 12px;}
  .spectrum-labels{display:flex; justify-content:space-between; font-size:12px; color:var(--text-gray-soft); font-weight:600; margin-bottom:10px;}
  .spectrum-track{position:relative; height:64px;}
  .spectrum-line{position:absolute; top:30px; left:0; right:0; height:4px; border-radius:2px; background:var(--grad);}
  .spectrum-pt{position:absolute; top:10px; display:flex; flex-direction:column; align-items:center; transform:translateX(-50%); width:100px;}
  .spectrum-pt .dot{width:14px; height:14px; border-radius:50%; background:#fff; border:3px solid var(--purple); margin-bottom:8px;}
  .spectrum-pt .lbl{font-size:11.5px; font-weight:600; text-align:center; color:var(--text-dark); line-height:1.3;}

  /* pillar / definition card */
  .def-box{
    background:var(--bg-light); border-radius:14px; padding:22px 24px; margin:22px 0; display:grid; gap:10px;
  }
  .def-box .row{display:grid; grid-template-columns:150px 1fr; gap:14px; font-size:13.5px;}
  .def-box .row .k{font-family:'Poppins',sans-serif; font-weight:600; color:var(--purple); font-size:12.5px;}
  .def-box .row .v{color:var(--text-gray);}

  .pro-con{display:grid; grid-template-columns:1fr 1fr; gap:20px; margin:22px 0;}
  .pro-con .box{border-radius:12px; padding:18px 20px; font-size:14px;}
  .pro-con .plus{background:rgba(31,156,147,0.07); border:1px solid rgba(31,156,147,0.18);}
  .pro-con .minus{background:rgba(109,47,143,0.06); border:1px solid rgba(109,47,143,0.16);}
  .pro-con .box .lbl{font-family:'Poppins',sans-serif; font-weight:700; font-size:12px; text-transform:uppercase; letter-spacing:0.04em; margin-bottom:10px; display:block;}
  .pro-con .plus .lbl{color:var(--teal);}
  .pro-con .minus .lbl{color:var(--purple);}
  .pro-con ul{list-style:none; display:grid; gap:6px; color:var(--text-gray);}
  .pro-con li{padding-left:16px; position:relative;}
  .pro-con li::before{content:"–"; position:absolute; left:0; color:var(--text-gray-soft);}

  .intl-badge{display:inline-flex; align-items:center; gap:6px; font-size:11.5px; font-weight:700; color:var(--text-gray-soft); background:var(--bg-light); padding:4px 10px; border-radius:999px; margin-bottom:14px;}

  /* decision factors */
  .factor-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:16px; margin-top:24px;}
  .factor{border:1px solid var(--border); border-radius:12px; padding:18px 20px;}
  .factor h4{font-size:14.5px; margin-bottom:6px;}
  .factor p{font-size:13.5px; margin-bottom:0;}

  /* service pillars (authority + conversion) */
  .service-section{
    background:linear-gradient(160deg, #0c0d15, #181a2c); color:#fff; border-radius:24px; padding:52px 48px; margin:8px 0 0;
  }
  .service-section .chapter-kicker{color:var(--teal-light);}
  .service-section h2{color:#fff;}
  .service-section > p{color:#b9b6d2;}
  .service-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-top:32px;}
  .service-card{background:rgba(255,255,255,0.05); border:1px solid rgba(255,255,255,0.1); border-radius:16px; padding:26px 22px;}
  .service-card .num{font-family:'Poppins',sans-serif; font-weight:800; color:var(--teal-light); font-size:13px; letter-spacing:0.08em; margin-bottom:14px; display:block;}
  .service-card h3{color:#fff; font-size:17px; margin-bottom:10px;}
  .service-card p{color:#b9b6d2; font-size:13.5px; margin-bottom:0;}

  /* FAQ */
  .faq-item{border-top:1px solid var(--border); padding:20px 0;}
  .faq-item:last-child{border-bottom:1px solid var(--border);}
  .faq-item h3{font-size:15.5px; margin-bottom:8px;}
  .faq-item p{font-size:14px; margin-bottom:0;}

  .sources{font-size:13.5px; color:var(--text-gray);}
  .sources ol{padding-left:18px; display:grid; gap:6px;}

  footer{background:#0c0d15; color:#8b87a8; padding:44px 32px 30px; font-size:13px; margin-top:20px;}
  .foot-inner{max-width:1200px; margin:0 auto; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px;}
  .foot-links{display:flex; gap:24px; flex-wrap:wrap;}
  .foot-links a{text-decoration:none; color:#b9b6d2;}

  @media (max-width: 980px){
    .layout{grid-template-columns:1fr; padding-top:36px;}
    .toc{position:static; display:flex; flex-wrap:wrap; gap:8px; margin-bottom:30px; padding-bottom:20px; border-bottom:1px solid var(--border);}
    .toc ol{display:flex; flex-wrap:wrap; gap:8px;}
    .toc a{border-left:none; border:1px solid var(--border); font-size:12.5px; padding:7px 12px;}
    .toc a::before{display:none;}
    .pro-con{grid-template-columns:1fr;}
    .service-grid{grid-template-columns:1fr;}
    .service-section{padding:36px 24px;}
    .factor-grid{grid-template-columns:1fr;}
    nav.links{display:none;}
    .spectrum-pt .lbl{font-size:10px;}
  }