:root{--navy:#0b2a4a;--navy2:#123c66;--coral:#ff7a45;--ink:#1d2733;--muted:#5b6876;--line:#e3e8ee;--bg:#fff;--soft:#f4f7fa}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Hiragino Sans","Noto Sans JP","PingFang SC","PingFang TC","Microsoft YaHei","Microsoft JhengHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:17px}
a{color:var(--navy2)}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.top{background:var(--navy);color:#fff;position:sticky;top:0;z-index:5}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:12px;padding-bottom:8px}
.logo{color:#fff;text-decoration:none;font-weight:800;font-size:22px;letter-spacing:.5px;line-height:1.2}
.logo span{color:var(--coral)}
.logo small{display:block;font-weight:400;font-size:12px;opacity:.8;letter-spacing:0}
.menu{display:flex;gap:4px;flex-wrap:wrap}
.menu a{color:#fff;text-decoration:none;padding:6px 10px;border-radius:6px;font-size:15px}
.menu a:hover{background:rgba(255,255,255,.12)}
.langs{display:flex;gap:12px;justify-content:flex-end;padding-bottom:8px;font-size:13px}
.langs a{color:#cfe0f2;text-decoration:none}
.langs a[aria-current]{color:#fff;font-weight:700;border-bottom:2px solid var(--coral)}
section{padding:56px 0}
section.alt{background:var(--soft)}
.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy2) 60%,#1f5a8c 100%);color:#fff;padding:88px 0 80px}
.hero h1{font-size:clamp(32px,5vw,52px);line-height:1.2;margin:.2em 0 .4em}
.hero .lead{max-width:680px;color:#dce8f4}
.eyebrow{color:var(--coral);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:14px;margin:0}
.lead{font-size:19px;color:var(--muted)}
.page-head{background:var(--soft);padding:48px 0 32px;border-bottom:1px solid var(--line)}
.page-head h1{margin:0 0 8px;font-size:clamp(28px,4vw,40px)}
h2{font-size:clamp(22px,3vw,30px);margin:1.4em 0 .6em;line-height:1.3}
section .wrap>h2:first-child{margin-top:0}
.btn{display:inline-block;background:var(--coral);color:#fff;text-decoration:none;padding:12px 22px;border-radius:8px;font-weight:700;margin:4px 6px 4px 0}
.btn.ghost{background:transparent;border:2px solid currentColor;color:inherit}
.stats{padding:28px 0;border-bottom:1px solid var(--line)}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;text-align:center}
.grid4 b{display:block;font-size:34px;color:var(--navy)}
.grid4 span{color:var(--muted);font-size:14px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{border:1px solid var(--line);border-radius:12px;padding:22px;background:#fff}
.card h3{margin:0 0 8px;color:var(--navy)}
.card h2{font-size:22px;margin:.2em 0 .4em}
.card h2 a{text-decoration:none}
.plist,.checks{padding-left:0;list-style:none}
.plist li,.checks li{padding:10px 0 10px 28px;border-bottom:1px solid var(--line);position:relative}
.plist li:before{content:"";position:absolute;left:4px;top:20px;width:10px;height:10px;border-radius:50%;background:var(--coral)}
.checks li:before{content:"✓";position:absolute;left:4px;color:var(--coral);font-weight:800}
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{counter-increment:s;padding:12px 0 12px 52px;position:relative;border-bottom:1px solid var(--line)}
.steps li:before{content:counter(s);position:absolute;left:0;top:10px;width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
table{width:100%;border-collapse:collapse;margin:12px 0 24px;font-size:15px;display:block;overflow-x:auto}
th,td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
thead th{background:var(--soft);color:var(--navy)}
tbody th{width:32%;color:var(--navy)}
.note{background:#fff5ef;border-left:4px solid var(--coral);padding:12px 16px;border-radius:6px}
.posts{display:grid;gap:20px}
.date,.crumb{color:var(--muted);font-size:14px;margin:0}
.post h1{font-size:clamp(28px,4vw,40px);line-height:1.25}
.cta{background:var(--navy);color:#fff;text-align:center}
.cta p{color:#dce8f4}
footer{background:#081f37;color:#b9c8d8;padding:32px 0;font-size:14px}
footer a{color:#fff}
.small{opacity:.7}
.root{background:var(--soft)}
.chooser{min-height:100vh;display:flex;flex-direction:column;justify-content:center;text-align:center;padding:40px 20px}
.logo.big{font-size:44px;color:var(--navy);margin:0}
.card.lang{text-decoration:none;color:var(--ink);display:block}
.card.lang b{display:block;font-size:22px;color:var(--navy)}
.card.lang span{color:var(--muted);font-size:14px}
@media (max-width:760px){.top{position:static}.grid3,.grid2{grid-template-columns:1fr}.grid4{grid-template-columns:repeat(2,1fr)}.menu a{padding:4px 8px;font-size:14px}.langs{justify-content:flex-start}section{padding:40px 0}.hero{padding:56px 0}}