:root{
  --navy:#0d1533;--blue:#1a3a6b;--mid:#2b5f9e;
  --bg:#f4f7fc;--card:#fff;--green:#06c755;--red:#dc2626;--gold:#f59e0b;
  --text:#1e293b;--muted:#64748b;--muted2:#94a3b8;--line:#e2e8f0;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;background:var(--bg);color:var(--text);line-height:1.9;-webkit-font-smoothing:antialiased;overflow-x:hidden;padding-bottom:calc(80px + env(safe-area-inset-bottom));word-break:normal;overflow-wrap:anywhere;}
.wrap{max-width:760px;margin:0 auto;padding:0 20px;}

/* topbar */
.topbar{background:rgba(13,21,51,.97);backdrop-filter:blur(8px);position:sticky;top:0;z-index:100;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.08);}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.topbar .logo-img{height:34px;filter:brightness(0) invert(1);}
.topbar-cta{background:var(--green);color:#fff;text-decoration:none;font-weight:700;font-size:.82rem;padding:9px 16px;border-radius:10px;white-space:nowrap;}

/* breadcrumb */
.bc{font-size:.78rem;color:var(--muted);padding:14px 0 0;}
.bc a{color:var(--mid);text-decoration:none;}
.bc a:hover{text-decoration:underline;}

/* article hero */
.art-hero{padding:32px 0 24px;}
.art-cat{display:inline-block;background:rgba(43,95,158,.1);color:var(--mid);font-size:.72rem;font-weight:800;padding:4px 12px;border-radius:6px;letter-spacing:.06em;margin-bottom:14px;}
.art-hero h1{font-size:1.75rem;line-height:1.4;font-weight:900;margin-bottom:12px;}
.art-meta{color:var(--muted2);font-size:.8rem;display:flex;gap:16px;flex-wrap:wrap;}
.art-meta span{display:flex;align-items:center;gap:4px;}

/* toc */
.toc{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 24px;margin:28px 0;}
.toc h2{font-size:.88rem;font-weight:800;color:var(--mid);margin-bottom:12px;letter-spacing:.06em;}
.toc ol{padding-left:20px;}
.toc li{font-size:.88rem;padding:4px 0;}
.toc a{color:var(--mid);text-decoration:none;}
.toc a:hover{text-decoration:underline;}

/* article body */
.art-body{padding:4px 0 40px;}
.art-body h2{font-size:1.3rem;font-weight:800;margin:40px 0 14px;padding-left:14px;border-left:4px solid var(--mid);line-height:1.45;}
.art-body h3{font-size:1.08rem;font-weight:700;margin:28px 0 10px;color:var(--navy);}
.art-body p{margin-bottom:16px;font-size:.96rem;}
.art-body ul,.art-body ol{padding-left:22px;margin-bottom:16px;}
.art-body li{font-size:.96rem;padding:4px 0;}
.art-body strong{color:var(--navy);}
.h-icon{display:inline-flex;align-items:center;justify-content:center;width:1.5em;height:1.5em;margin-right:.35em;font-size:.86em;line-height:1;vertical-align:.08em;background:rgba(43,95,158,.1);border-radius:8px;}

/* lead answer */
.lead-answer{background:linear-gradient(160deg,#ffffff,#edf5ff);border:1px solid var(--line);border-left:6px solid var(--mid);border-radius:16px;padding:20px 22px;margin:24px 0 28px;box-shadow:0 8px 24px rgba(13,21,51,.06);font-size:.96rem;font-weight:700;color:var(--navy);white-space:pre-line;}
.lead-answer p{margin-bottom:10px;}
.lead-answer p:last-child{margin-bottom:0;}

/* point box */
.point-box{background:linear-gradient(160deg,#eff6ff,#f0f5fc);border:1.5px solid var(--mid);border-radius:14px;padding:20px 22px;margin:20px 0;}
.point-box .pb-title{font-weight:800;font-size:.88rem;color:var(--mid);margin-bottom:10px;letter-spacing:.05em;}
.point-box ul{padding-left:18px;margin:0;}
.point-box li{font-size:.9rem;padding:4px 0;}

/* warn box */
.warn-box{background:#fff5f5;border:1.5px solid #fca5a5;border-radius:14px;padding:18px 20px;margin:20px 0;font-size:.9rem;color:#991b1b;}

/* compare table */
.compare-table-wrap{width:100%;overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:0 6px 18px rgba(13,21,51,.04);}
.compare-table{width:100%;min-width:560px;border-collapse:separate;border-spacing:0;font-size:.9rem;}
.art-body > .compare-table{display:block;overflow-x:auto;margin:22px 0;}
.compare-table th,.compare-table td{padding:13px 14px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:left;vertical-align:top;}
.compare-table th:last-child,.compare-table td:last-child{border-right:0;}
.compare-table tr:last-child td{border-bottom:0;}
.compare-table thead th{background:var(--navy);color:#fff;font-weight:800;}
.compare-table thead th:first-child{border-top-left-radius:13px;}
.compare-table thead th:last-child{border-top-right-radius:13px;}
.compare-table tbody tr:nth-child(even) td{background:#f8fbff;}

/* flow diagram */
.flow-diagram{display:flex;align-items:stretch;gap:24px;margin:24px 0;padding:18px;background:var(--card);border:1px solid var(--line);border-radius:16px;}
.flow-step{position:relative;flex:1;min-width:0;background:linear-gradient(160deg,#f8fbff,#eef5ff);border:1.5px solid rgba(43,95,158,.28);border-radius:14px;padding:13px 12px;text-align:center;font-size:.88rem;font-weight:800;color:var(--navy);line-height:1.5;}
.flow-step:not(:last-child)::after{content:"→";position:absolute;right:-21px;top:50%;transform:translateY(-50%);color:var(--mid);font-weight:900;font-size:1.1rem;}

/* inlink */
.inlink{display:block;background:var(--card);border:1.5px solid var(--mid);border-radius:14px;padding:16px 20px;margin:24px 0;text-decoration:none;transition:box-shadow .2s;}
.inlink:hover{box-shadow:0 4px 16px rgba(43,95,158,.15);}
.inlink .il-label{font-size:.7rem;font-weight:800;color:var(--mid);letter-spacing:.1em;margin-bottom:4px;}
.inlink .il-title{font-size:.95rem;font-weight:700;color:var(--navy);}

/* inline CTA */
.inline-cta{display:flex;align-items:center;justify-content:space-between;gap:14px;background:#edf8f2;border:1.5px solid rgba(6,199,85,.28);border-radius:14px;padding:14px 16px;margin:28px 0;}
.inline-cta p{margin:0;font-size:.9rem;font-weight:700;color:var(--navy);line-height:1.6;}
.inline-cta a{flex:0 0 auto;background:var(--green);color:#fff;text-decoration:none;font-size:.82rem;font-weight:800;line-height:1.2;padding:10px 14px;border-radius:10px;box-shadow:0 6px 16px rgba(6,199,85,.22);}

/* CTA banner */
.cta-banner{background:linear-gradient(135deg,var(--navy) 0%,var(--blue) 60%,var(--mid) 100%);border-radius:20px;padding:36px 28px;text-align:center;margin:36px 0;}
.cta-banner h3{color:#fff;font-size:1.25rem;font-weight:900;margin-bottom:8px;line-height:1.45;}
.cta-banner p{color:rgba(255,255,255,.75);font-size:.88rem;margin-bottom:20px;}
.btn-line{display:block;background:var(--green);color:#fff;text-decoration:none;font-weight:800;font-size:1rem;padding:18px;border-radius:14px;max-width:380px;margin:0 auto;box-shadow:0 10px 28px rgba(6,199,85,.4);}
.btn-line small{display:block;font-size:.72rem;font-weight:500;opacity:.9;margin-top:4px;}
.refund{color:rgba(255,255,255,.55);font-size:.78rem;margin-top:8px;}

/* FAQ */
.faq-section{margin:40px 0;}
.faq-section h2{font-size:1.3rem;font-weight:800;margin-bottom:20px;padding-left:14px;border-left:4px solid var(--mid);}
details{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:10px 0;overflow:hidden;}
summary{padding:16px 48px 16px 18px;font-weight:700;font-size:.93rem;cursor:pointer;position:relative;list-style:none;color:var(--text);}
summary::-webkit-details-marker{display:none;}
summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);color:var(--mid);font-size:1.4rem;font-weight:400;}
details[open] summary::after{content:"–";}
details[open] summary{background:linear-gradient(160deg,#f0f5fc,#fafcff);}
details .a{padding:0 18px 16px;color:var(--muted);font-size:.9rem;line-height:1.75;}

/* related */
.related{margin:40px 0;}
.related h2{font-size:1.1rem;font-weight:800;margin-bottom:14px;color:var(--navy);}
.rel-grid{display:grid;grid-template-columns:1fr;gap:10px;}
.rel-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;text-decoration:none;display:block;transition:box-shadow .18s;}
.rel-card:hover{box-shadow:0 4px 14px rgba(43,95,158,.12);}
.rel-card .rc-cat{font-size:.68rem;font-weight:800;color:var(--mid);letter-spacing:.08em;margin-bottom:4px;}
.rel-card .rc-title{font-size:.9rem;font-weight:700;color:var(--navy);}

/* footer */
footer{background:var(--navy);border-top:1px solid rgba(255,255,255,.08);padding:28px 0 40px;text-align:center;color:rgba(255,255,255,.4);font-size:.78rem;}
footer a{color:rgba(255,255,255,.6);}

/* sticky */
.sticky{position:fixed;left:0;right:0;bottom:0;background:rgba(13,21,51,.97);backdrop-filter:blur(10px);border-top:1px solid rgba(255,255,255,.1);padding:10px 16px calc(10px + env(safe-area-inset-bottom));z-index:200;}
.sticky a{display:block;background:var(--green);color:#fff;text-align:center;text-decoration:none;font-weight:800;padding:15px;border-radius:13px;font-size:.96rem;}
.sticky a small{font-weight:500;font-size:.7rem;opacity:.9;}

@keyframes pulse-glow{0%{box-shadow:0 10px 28px rgba(6,199,85,.4);}50%{box-shadow:0 10px 36px rgba(6,199,85,.65);}100%{box-shadow:0 10px 28px rgba(6,199,85,.4);}}
.pulse{animation:pulse-glow 2.2s infinite;}

@media(min-width:600px){
  .art-hero h1{font-size:2rem;}
  .rel-grid{grid-template-columns:1fr 1fr;}
}

@media(max-width:599px){
  .lead-answer{padding:18px 18px;margin:20px 0 24px;}
  .flow-diagram{flex-direction:column;gap:20px;padding:16px;}
  .flow-step:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-22px;transform:translateX(-50%);}
  .inline-cta{display:block;padding:16px;}
  .inline-cta a{display:inline-block;margin-top:10px;}
}