:root{--bg:#f7fbff;--paper:#fff;--ink:#152334;--muted:#687586;--line:#dbe5ee;--blue:#1e73be;--sky:#dff3ff;--navy:#102a43}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;line-height:1.85}a{color:inherit;text-decoration:none}.wrap{width:min(1120px,calc(100% - 36px));margin:auto}header{position:sticky;top:0;z-index:10;background:rgba(247,251,255,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.nav{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{font-weight:800}.nav nav{display:flex;gap:20px;font-size:12px}.hero{padding:110px 0 85px;background:linear-gradient(135deg,#eef9ff,#fff)}.eyebrow{font-size:11px;letter-spacing:.18em;color:var(--blue);font-weight:800}.hero h1,h2{font-family:Georgia,"Yu Mincho",serif}.hero h1{font-size:clamp(48px,8vw,92px);line-height:1.02;margin:14px 0 24px}.lead{font-size:clamp(19px,2.5vw,28px);font-weight:700;max-width:800px}.copy{color:var(--muted);max-width:800px}section{padding:76px 0;border-top:1px solid var(--line)}h2{font-size:clamp(34px,5vw,58px);margin:0 0 28px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:26px}.card h3{margin:6px 0 10px;font-size:21px}.card p{color:var(--muted)}.tag{display:inline-block;background:var(--sky);color:var(--blue);padding:5px 10px;border-radius:999px;font-size:11px;font-weight:700}.youtube{background:var(--navy);color:#fff}.youtube .copy{color:#cbd9e6}.btn{display:inline-block;margin-top:18px;padding:12px 18px;border:1px solid currentColor;border-radius:999px;font-weight:700}.profile-box{display:grid;grid-template-columns:1fr 2fr;gap:28px;align-items:start}.article{width:min(780px,calc(100% - 36px));margin:auto;padding:70px 0}.article h1{font-size:clamp(34px,6vw,56px);line-height:1.35}.article h2{font-family:inherit;font-size:28px;margin-top:2em}.video-placeholder{aspect-ratio:16/9;background:var(--navy);display:grid;place-items:center;color:#fff;border-radius:16px;margin:30px 0}.notice{background:var(--sky);padding:18px;border-radius:12px}footer{padding:40px 0;color:var(--muted);font-size:12px}@media(max-width:760px){.nav nav{gap:10px;font-size:10px}.grid{grid-template-columns:1fr}.profile-box{grid-template-columns:1fr}.hero{padding:80px 0 60px}}
.video-wrap{position:relative;width:100%;aspect-ratio:16/9;margin:28px 0;border-radius:18px;overflow:hidden;background:#102a43;box-shadow:0 12px 32px rgba(16,42,67,.12)}.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.video-meta{font-size:.9rem;color:var(--muted);margin-top:-16px;margin-bottom:28px}