:root{--paper:#f5f6f3;--surface:#fff;--line:#d9dcd6;--ink:#1f2328;--ink-2:#4c5563;--muted:#7b8494;--accent:#34508a;--accent-soft:#e6ebf6;--seal:#b8382c}
@media(prefers-color-scheme:dark){:root{--paper:#15181e;--surface:#1d2129;--line:#323845;--ink:#e8eaee;--ink-2:#b4bac6;--muted:#8a92a3;--accent:#8fa6dc;--accent-soft:#252d40;--seal:#e0685b}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 -apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.jp{font-family:"Hiragino Sans","Yu Gothic","Noto Sans JP","Meiryo",sans-serif}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}
header{padding:22px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}
header a.brand{text-decoration:none;color:var(--ink);font-weight:700;font-size:22px}
header a.brand .jp{font-size:26px;margin-right:8px}
nav a{color:var(--ink-2);text-decoration:none;margin-left:18px;font-size:15px}nav a:hover{color:var(--accent)}
.hero{padding:56px 0 40px}
.hero h1{font-size:40px;line-height:1.15;margin:0 0 14px;letter-spacing:-.01em}
.hero p{font-size:19px;color:var(--ink-2);max-width:60ch;margin:0 0 24px}
.badges{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.badge{display:inline-flex;align-items:center;gap:10px;padding:10px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);text-decoration:none;font-weight:600}
.badge.soon{opacity:.55;pointer-events:none}
.badge small{display:block;font-weight:400;color:var(--muted);font-size:12px;line-height:1.2}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin:36px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}
.card h3{margin:0 0 6px;font-size:17px}.card p{margin:0;color:var(--ink-2);font-size:15px}
.card .k{font-size:30px;color:var(--accent);margin-bottom:8px}
.tiers{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:24px 0 40px}
.tier{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}
.tier h3{margin:0 0 4px}.tier .price{color:var(--muted);font-size:14px;margin-bottom:10px}
.tier ul{margin:0;padding-left:18px;color:var(--ink-2);font-size:15px}
h2{font-size:26px;margin:40px 0 12px}
article h2{font-size:22px;margin:32px 0 8px}article h3{font-size:18px;margin:22px 0 6px}
article p,article li{color:var(--ink-2)}
footer{border-top:1px solid var(--line);margin-top:56px;padding:24px 0 40px;color:var(--muted);font-size:14px}
footer a{color:var(--muted)}
.note{color:var(--muted);font-size:14px}
a{color:var(--accent)}

.badge.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.badge.primary small{color:rgba(255,255,255,.75)}
header a.brand{white-space:nowrap;display:inline-flex;align-items:center}
nav{display:flex;flex-wrap:wrap;gap:4px 18px;justify-content:flex-end}
nav a{margin-left:0;white-space:nowrap}
@media(max-width:600px){
  header{flex-direction:column;align-items:flex-start;gap:10px;padding:16px 0}
  header a.brand{font-size:20px} header a.brand .jp{font-size:22px}
  nav{justify-content:flex-start;gap:4px 16px;font-size:14px}
  .hero{padding:28px 0 28px} .hero h1{font-size:32px} .hero p{font-size:17px}
}
.box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:4px 18px;margin:20px 0}
article ul,article ol{padding-left:22px}article li{margin:4px 0}
article h2[id],article h3[id]{scroll-margin-top:16px}