:root{
  --ink:#1d2340; --night:#171c36; --dusk:#eceff5; --paper:#fbfbfd;
  --muted:#5a6285; --line:#cfd4e3; --lamp:#c98a1f; --lamp-soft:#f6e7c6;
  --serif:"Hiragino Mincho ProN","Yu Mincho","YuMincho","Noto Serif JP",serif;
  --sans:"Hiragino Kaku Gothic ProN","Yu Gothic UI","Yu Gothic","Meiryo",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--dusk);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.8}
a{color:#2f3a8f}
a:focus-visible,button:focus-visible{outline:3px solid var(--lamp);outline-offset:2px}

/* 年齢確認が済むまで本文を隠す（head内のスクリプトが needs-gate を付ける） */
.needs-gate main,.needs-gate .site-footer{visibility:hidden}

.pr-bar{background:#0f1226;color:#c9cfe8;font-size:12px;line-height:1.5;text-align:center;padding:6px 12px}
.pr-bar b{display:inline-block;border:1px solid #6b74a3;border-radius:3px;padding:0 6px;margin-right:8px;font-weight:600}

.site-header{background:var(--night);color:#e9ecf7;padding:28px 20px 32px}
.site-header .inner{max-width:960px;margin:0 auto}
.brand{display:flex;align-items:center;gap:14px;color:inherit;text-decoration:none}
.brand svg{flex:none}
.brand-name{font-family:var(--serif);font-size:clamp(28px,6vw,40px);letter-spacing:.14em;font-weight:700;line-height:1.2}
.lead{margin:14px 0 0;color:#c9cfe8;font-size:15px;max-width:34em}
.site-nav{margin-top:18px;display:flex;flex-wrap:wrap;gap:6px 20px;font-size:14px}
.site-nav a{color:#c9cfe8}

main{max-width:960px;margin:0 auto;padding:32px 20px 56px}
h2{font-family:var(--serif);font-size:22px;letter-spacing:.06em;margin:0 0 6px;line-height:1.5}
h3{font-family:var(--serif);font-size:18px;margin:32px 0 6px;line-height:1.5}
.note{color:var(--muted);font-size:14px;margin:0 0 20px}

.local-banner{background:var(--lamp-soft);border:1px solid var(--lamp);padding:10px 14px;font-size:14px;margin:0 0 20px}

.books{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px 18px}
.book{background:var(--paper);border:1px solid var(--line);border-left:9px solid #2f3a6b;border-radius:2px 8px 8px 2px;box-shadow:0 4px 0 #b9bfd4;padding:16px 16px 18px;display:flex;flex-direction:column}
.book:nth-child(4n+2){border-left-color:#4a3d63}
.book:nth-child(4n+3){border-left-color:#2d5566}
.book:nth-child(4n+4){border-left-color:#5b4a3a}
.badge{align-self:flex-start;margin:0 0 8px;background:var(--lamp);color:#1d2340;font-weight:700;font-size:14px;line-height:1;padding:6px 9px;border-radius:3px}
.book-title{font-family:var(--serif);font-size:18px;line-height:1.55;margin:0 0 4px}
.book-meta{margin:0 0 12px;font-size:13px;color:var(--muted)}
.facts{margin:0 0 16px;font-size:14px}
.facts div{display:flex;gap:10px;padding:5px 0;border-top:1px solid var(--line)}
.facts dt{flex:none;width:5.5em;color:var(--muted)}
.facts dd{margin:0}
.facts s{color:var(--muted);margin-right:6px}
.facts .now{font-weight:700}
.btn{margin-top:auto;display:block;text-align:center;background:var(--ink);color:#fff;text-decoration:none;padding:11px 14px;border-radius:4px;font-size:15px}
.btn:hover{background:#2f3a6b}
.empty{background:var(--paper);border:1px dashed var(--line);padding:28px 20px;text-align:center;color:var(--muted)}

.prose{max-width:40em}
.prose p,.prose li{font-size:15px}
.prose ul{padding-left:1.4em}
.info{width:100%;border-collapse:collapse;font-size:15px;margin:8px 0 8px}
.info th,.info td{border-top:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}
.info th{width:9em;color:var(--muted);font-weight:600}
.info tr:last-child th,.info tr:last-child td{border-bottom:1px solid var(--line)}

.site-footer{background:var(--night);color:#c9cfe8;padding:26px 20px;font-size:13px}
.site-footer .inner{max-width:960px;margin:0 auto}
.site-footer a{color:#c9cfe8}
.site-footer p{margin:6px 0}

/* 年齢確認 */
.gate{position:fixed;inset:0;z-index:100;background:rgba(15,18,38,.97);display:flex;align-items:center;justify-content:center;padding:20px}
.gate-box{background:var(--paper);max-width:420px;width:100%;padding:30px 24px;border-radius:8px;text-align:center}
.gate-box h2{font-size:22px;margin-bottom:10px}
.gate-box p{margin:0 0 20px;font-size:15px}
.gate-actions{display:flex;flex-direction:column;gap:10px}
.gate-actions button{font:inherit;font-size:16px;padding:13px 16px;border-radius:4px;cursor:pointer;border:1px solid var(--ink)}
.gate-yes{background:var(--ink);color:#fff}
.gate-no{background:transparent;color:var(--ink)}
body.gate-lock{overflow:hidden}

@media (min-width:640px){.gate-actions{flex-direction:row}.gate-actions button{flex:1}}