*{box-sizing:border-box}
:root{
  --bg:#f7f8fb;--panel:#fff;--ink:#111827;--muted:#5f6b7a;--line:#e5e7eb;
  --accent:#4f46e5;--accent2:#7c3aed;--good:#0f766e;--warn:#b45309;--dark:#111827;
  --radius:20px;--shadow:0 16px 45px rgba(17,24,39,.08)
}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,"Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.8}
a{color:inherit;text-decoration:none}
.wrap{width:min(1120px,calc(100% - 40px));margin:auto}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;background:white;padding:8px 12px;z-index:999}
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,248,251,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(229,231,235,.8)}
.header-inner{height:70px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.02em}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-size:14px}
.nav{display:flex;gap:20px;font-size:14px;color:#374151}
.nav a:hover{color:var(--accent)}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:7px 11px}
.hero{padding:92px 0 70px;background:
  radial-gradient(circle at 85% 20%,rgba(124,58,237,.12),transparent 24rem),
  radial-gradient(circle at 12% 10%,rgba(79,70,229,.10),transparent 25rem)}
.ad-placement{padding:28px 0;overflow:hidden}
.ad-placement-top{padding-top:28px;padding-bottom:0}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,360px);gap:54px;align-items:center}
.eyebrow,.kicker{font-size:12px;font-weight:800;letter-spacing:.16em;color:var(--accent);margin:0 0 12px}
h1{font-size:clamp(34px,4.4vw,60px);line-height:1.18;letter-spacing:-.04em;margin:0 0 24px;word-break:keep-all;overflow-wrap:normal}
.lead{font-size:18px;color:var(--muted);max-width:760px}
.hero-actions{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 18px;border:1px solid var(--line);border-radius:12px;background:#fff;font-weight:700}
.btn.primary{background:var(--dark);color:white;border-color:var(--dark)}
.hero-card{background:linear-gradient(180deg,#171a2d,#111827);color:#fff;padding:28px;border-radius:24px;box-shadow:var(--shadow);min-width:0;width:100%;max-width:360px;justify-self:end}
.mini-title{font-size:14px;line-height:1.4;color:#a5b4fc;font-weight:800;margin-bottom:16px;white-space:nowrap}
.hero-points{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.hero-points li{display:flex;gap:11px;align-items:flex-start;margin:0;color:#dbe3f0;line-height:1.55}
.hero-points b{display:block;min-width:0;flex:1;font-size:15px;word-break:keep-all;overflow-wrap:break-word}
.hero-point-num{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:rgba(165,180,252,.14);color:#c7d2fe;font-size:12px;font-weight:900;line-height:1}
.section{padding:86px 0}.section.alt{background:#fff}
.section-head{max-width:920px;margin-bottom:38px}.section-head.center{text-align:center;margin-left:auto;margin-right:auto}
.section-head h2{font-size:clamp(26px,3.2vw,40px);line-height:1.3;letter-spacing:-.025em;margin:0 0 14px;word-break:keep-all;overflow-wrap:normal}
.section-head p{color:var(--muted);margin:0}
.cards{display:grid;gap:18px}.cards.four{grid-template-columns:repeat(4,1fr)}
.card{background:var(--panel);padding:26px;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 30px rgba(17,24,39,.03)}
.card h3{margin:10px 0 8px}.card p{color:var(--muted);margin:0;font-size:15px}.num{font:700 12px monospace;color:var(--accent)}
.compare,.privacy-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.compare article,.privacy-grid article{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.compare h3,.privacy-grid h3{margin-top:0}
.check,.warn{list-style:none;padding:0;margin:0}.check li,.warn li{position:relative;padding-left:26px;margin:10px 0}.check li:before,.warn li:before{position:absolute;left:0;font-weight:900}
.check li:before{content:"✓";color:var(--good)}.warn li:before{content:"!";color:var(--warn)}
.note,.danger,.rule-box{margin-top:24px;padding:20px 22px;border-radius:14px;background:#f3f4ff;border:1px solid #d9dcff}
.danger{background:#fff7ed;border-color:#fed7aa}
.reasoning-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.level{border:1px solid var(--line);border-radius:var(--radius);padding:26px;background:#fff}
.level.featured{border-color:#a5b4fc;box-shadow:0 14px 40px rgba(79,70,229,.12)}
.level-top{display:flex;justify-content:space-between;align-items:center}.level-top span{font-size:28px;font-weight:900}.level-top small{color:var(--muted);font-weight:800;letter-spacing:.1em}
.level h3{margin:12px 0 8px}.level p{color:var(--muted)}.level ul{padding-left:20px}
.rule-box h3{margin:0 0 6px}.rule-box p{margin:0}
.formula{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.formula div{padding:24px;border-right:1px solid var(--line)}.formula div:last-child{border-right:0}.formula b,.formula span{display:block}.formula span{font-size:14px;color:var(--muted);margin-top:4px}
.example{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px}.example>div{padding:24px;border-radius:16px;border:1px solid var(--line)}.bad{background:#fff}.good{background:#f0fdf4}.label{font-size:12px;font-weight:800;color:var(--muted)}
.tips-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px}.tips-grid article{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.tips-grid h3{margin-top:0}.tips-grid p{color:var(--muted);margin-bottom:0}
.steps{display:grid;gap:14px}.steps article{display:flex;gap:18px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.steps span{flex:0 0 38px;height:38px;display:grid;place-items:center;border-radius:50%;background:var(--dark);color:white;font-weight:800}.steps h3{margin:0 0 3px}.steps p{margin:0;color:var(--muted)}
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.tool-grid article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}.tool-grid h3{margin:12px 0 6px}.tool-grid p{color:var(--muted);margin:0}.tool-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;background:#eef2ff;color:var(--accent);font-weight:900;font-family:monospace}
.small-note{font-size:13px;color:var(--muted);margin-top:14px}
.context-layout{display:grid;grid-template-columns:1.3fr .7fr;gap:24px;align-items:start}.plain-list{padding-left:20px}.context-card{background:#111827;color:#fff;padding:28px;border-radius:20px}.context-card p{color:#dbe3f0;margin-bottom:0}
code{background:#f3f4f6;border-radius:6px;padding:2px 6px}
.selector-section{background:linear-gradient(180deg,#111827,#181c31);color:white}.selector-section .section-head p{color:#cbd5e1}.selector-section .kicker{color:#a5b4fc}
.selector{max-width:820px;margin:auto;background:#fff;color:var(--ink);padding:28px;border-radius:24px}.question{padding:18px 0;border-bottom:1px solid var(--line)}.question:first-child{padding-top:0}.question p{font-weight:700;margin:0 0 12px}.choices{display:flex;gap:8px;flex-wrap:wrap}.choices button{border:1px solid var(--line);background:#f8fafc;padding:9px 14px;border-radius:999px;cursor:pointer}.choices button.active{background:var(--dark);color:#fff;border-color:var(--dark)}.result{margin-top:22px;padding:18px;border-radius:14px;background:#eef2ff;font-weight:700}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:18px;background:#fff}table{width:100%;border-collapse:collapse;min-width:640px}th,td{text-align:left;padding:18px 20px;border-bottom:1px solid var(--line)}th{background:#f8fafc;font-size:13px}tr:last-child td{border-bottom:0}
.workflow{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.workflow>div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.workflow span{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;background:#eef2ff;color:var(--accent);font-weight:800;margin-right:8px}.workflow p{color:var(--muted);margin-bottom:0}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:10px 0}.faq summary{font-weight:800;cursor:pointer}.faq details p{color:var(--muted)}
footer{background:#0b1020;color:white;padding:40px 0}.footer-inner{display:flex;justify-content:space-between;align-items:flex-end;gap:20px}.footer-inner p{color:#9ca3af;margin-bottom:0}.footer-brand{margin-bottom:8px}
@media(max-width:1080px) and (min-width:901px){
  .hero-grid{grid-template-columns:minmax(0,1fr) minmax(280px,320px);gap:30px}
  .hero-card{padding:24px}
  .hero-points b{font-size:14px}
}
@media(max-width:900px){
  .cards.four,.tool-grid{grid-template-columns:repeat(2,1fr)}.reasoning-grid,.tips-grid,.workflow{grid-template-columns:1fr 1fr}.hero-grid{grid-template-columns:1fr}.hero{padding-top:62px}.nav{display:none;position:absolute;top:70px;left:20px;right:20px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;box-shadow:var(--shadow);flex-direction:column}.nav.open{display:flex}.menu-btn{display:block}.formula{grid-template-columns:1fr 1fr}.formula div:nth-child(2){border-right:0}.formula div{border-bottom:1px solid var(--line)}
}
@media(max-width:620px){
  .wrap{width:min(100% - 28px,1120px)}.section{padding:66px 0}.cards.four,.tool-grid,.reasoning-grid,.tips-grid,.workflow,.compare,.privacy-grid,.example,.context-layout{grid-template-columns:1fr}.formula{grid-template-columns:1fr}.formula div{border-right:0}.hero{padding-top:48px}.hero-card{padding:22px}.mini-title{white-space:normal}.hero-points b{font-size:15px}h1{font-size:clamp(31px,9.2vw,39px)}.footer-inner{align-items:flex-start;flex-direction:column}.choices button{flex:1}.selector{padding:20px}
}

.card h3,.level h3,.tips-grid h3,.steps h3,.tool-grid h3,.privacy-grid h3,.compare h3,.context-card b,.question p{word-break:keep-all;overflow-wrap:normal}

@media(max-width:620px){
  .section-head h2{font-size:clamp(24px,7.4vw,31px);line-height:1.35}
  .section-head{max-width:100%}
}