*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    :root{
      --p:#1a56db;--pd:#1447c0;--pbg:#eff6ff;
      --g:#10b981;--warn:#f59e0b;
      --dk:#0f172a;--tx:#374151;--txl:#6b7280;
      --bg:#f9fafb;--w:#fff;--bd:#e5e7eb;
      --r:12px;--ease:.25s ease;
    }
    html{scroll-behavior:smooth}
    body{font-family:'Noto Sans SC',-apple-system,sans-serif;color:var(--tx);background:var(--bg);line-height:1.75}
    a{text-decoration:none;color:inherit}

    /* NAV */
    .nav{position:fixed;top:0;left:0;right:0;z-index:99;height:64px;background:rgba(255,255,255,.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--bd)}
    .nav-inner{max-width:820px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}
    .logo{display:flex;align-items:center;gap:8px}
    .logo-mark{background:linear-gradient(135deg,var(--p),#60a5fa);color:#fff;font-weight:800;font-size:13px;padding:4px 10px;border-radius:7px}
    .logo-name{font-size:16px;font-weight:800;color:var(--dk)}
    .logo-name span{color:var(--p)}
    .nav-back{font-size:14px;color:var(--txl);display:flex;align-items:center;gap:4px}
    .nav-back:hover{color:var(--p)}

    /* PAGE */
    .page{max-width:720px;margin:0 auto;padding:96px 24px 80px}

    /* HERO */
    .hero{margin-bottom:48px}
    .hero-tag{display:inline-flex;align-items:center;gap:6px;background:#fef3c7;color:#92400e;font-size:13px;font-weight:600;padding:5px 12px;border-radius:99px;margin-bottom:16px}
    .hero h1{font-size:clamp(22px,4vw,34px);font-weight:800;color:var(--dk);line-height:1.3;margin-bottom:14px}
    .hero h1 em{color:var(--p);font-style:normal}
    .hero-lead{font-size:16px;color:var(--txl);line-height:1.8;max-width:580px}
    .hero-lead strong{color:var(--tx)}

    /* DIVIDER */
    hr{border:none;border-top:1px solid var(--bd);margin:40px 0}

    /* SECTION TITLE */
    .sec-label{font-size:12px;font-weight:700;color:var(--txl);text-transform:uppercase;letter-spacing:1px;margin-bottom:24px;display:flex;align-items:center;gap:8px}
    .sec-label::after{content:'';flex:1;height:1px;background:var(--bd)}

    /* Q&A CARDS */
    .qa-list{display:flex;flex-direction:column;gap:16px;margin-bottom:48px}
    .qa{background:var(--w);border:1px solid var(--bd);border-radius:var(--r);overflow:hidden}
    .qa-q{
      display:flex;align-items:flex-start;gap:14px;
      padding:20px 22px;cursor:pointer;
      transition:background var(--ease);user-select:none;
    }
    .qa-q:hover{background:#f9fafb}
    .qa-num{
      width:28px;height:28px;border-radius:8px;
      background:var(--pbg);color:var(--p);
      font-size:13px;font-weight:700;
      display:flex;align-items:center;justify-content:center;flex-shrink:0;
    }
    .qa-num.open{background:var(--p);color:#fff}
    .qa-text{font-size:16px;font-weight:600;color:var(--dk);flex:1;line-height:1.5;padding-top:3px}
    .qa-arrow{flex-shrink:0;font-size:14px;color:var(--txl);margin-top:5px;transition:transform .2s}
    .qa-arrow.open{transform:rotate(180deg)}
    .qa-a{
      display:none;padding:0 22px 22px 64px;
      font-size:15px;color:var(--tx);line-height:1.85;
    }
    .qa-a.open{display:block}
    .qa-a p{margin-bottom:12px}
    .qa-a p:last-child{margin:0}
    .qa-a strong{color:var(--dk)}
    .qa-a .tip{
      background:#f0fdf4;border-left:3px solid var(--g);
      border-radius:0 8px 8px 0;padding:12px 16px;
      font-size:14px;color:#065f46;margin-top:10px;
    }
    .qa-a .warn{
      background:#fffbeb;border-left:3px solid var(--warn);
      border-radius:0 8px 8px 0;padding:12px 16px;
      font-size:14px;color:#78350f;margin-top:10px;
    }

    /* PROMISE */
    .promise{background:var(--w);border:1px solid var(--bd);border-radius:16px;padding:28px 28px 24px;margin-bottom:48px}
    .promise h3{font-size:17px;font-weight:700;color:var(--dk);margin-bottom:18px;display:flex;align-items:center;gap:8px}
    .promise-list{display:flex;flex-direction:column;gap:12px}
    .pi{display:flex;align-items:flex-start;gap:12px}
    .pi-dot{width:8px;height:8px;border-radius:50%;background:var(--g);flex-shrink:0;margin-top:8px}
    .pi-text{font-size:15px;color:var(--tx);line-height:1.7}
    .pi-text strong{color:var(--dk)}

    /* CTA */
    .cta{background:linear-gradient(135deg,var(--p),#2563eb);border-radius:16px;padding:32px 28px;text-align:center}
    .cta h3{font-size:20px;font-weight:800;color:#fff;margin-bottom:8px}
    .cta p{font-size:15px;color:rgba(255,255,255,.8);margin-bottom:20px}
    .cta a{
      display:inline-block;background:#fff;color:var(--p);
      padding:12px 32px;border-radius:9px;font-size:15px;font-weight:700;
      transition:all var(--ease);
    }
    .cta a:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.2)}

    /* FOOTER */
    .foot{text-align:center;padding:32px 24px;font-size:13px;color:var(--txl);border-top:1px solid var(--bd);margin-top:0}
    .foot a{color:var(--txl)}
    .foot a:hover{color:var(--p)}

    /* fade */
    .fi{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
    .fi.on{opacity:1;transform:none}

    @media(max-width:600px){
      .qa-a{padding-left:22px}
    }