:root{--night:#05070e;--panel:#0c1222;--ink:#e6ebf5;--muted:#9aa6bd;--rule:rgba(150,172,212,.18);--amber:#f2b860;--f-display:"Shippori Mincho B1","Hiragino Mincho ProN","Yu Mincho",serif;--f-body:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic","Noto Sans JP",system-ui,sans-serif;color-scheme:dark}
*{box-sizing:border-box}
body{margin:0;background:radial-gradient(ellipse at 50% -10%,#14204a 0,#05070e 60%) fixed,var(--night);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.85}
a{color:#f5c77d}
.wrap{max-width:760px;margin:0 auto;padding:0 18px}
header.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-block:18px;border-bottom:1px solid var(--rule)}
header.top a.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-family:var(--f-display);font-weight:600;font-size:19px;letter-spacing:.06em}
header.top a.brand img{width:30px;height:30px}
.btn{display:inline-block;background:var(--amber);color:#1a1206;font-weight:700;text-decoration:none;padding:10px 18px;border-radius:999px;white-space:nowrap}
.btn.big{font-size:18px;padding:14px 26px}
main{padding-block:28px 40px}
h1{font-family:var(--f-display);font-weight:600;font-size:clamp(26px,5.4vw,38px);line-height:1.35;letter-spacing:.03em;margin:8px 0 12px;text-wrap:balance}
h2{font-family:var(--f-display);font-weight:600;font-size:clamp(21px,4vw,26px);margin:44px 0 10px;padding-top:6px;border-top:1px solid var(--rule);text-wrap:balance}
h3{font-size:18px;margin:26px 0 6px}
.lead{color:#cdd5e4;font-size:17px}
.meta{color:var(--muted);font-size:13px}
.steps{display:grid;gap:12px;padding:0;list-style:none;counter-reset:s}
.steps li{background:var(--panel);border:1px solid var(--rule);border-radius:14px;padding:14px 16px 14px 56px;position:relative;counter-increment:s}
.steps li::before{content:counter(s);position:absolute;left:16px;top:14px;width:28px;height:28px;border-radius:50%;background:var(--amber);color:#1a1206;font-weight:700;display:grid;place-items:center;font-size:15px;line-height:1}
.tbl{overflow-x:auto;border:1px solid var(--rule);border-radius:12px;margin:14px 0}
table{border-collapse:collapse;width:100%;min-width:620px;font-size:14.5px}
th,td{padding:10px 12px;border-bottom:1px solid var(--rule);text-align:left;vertical-align:top}
th{background:#0f1730;color:#cdd5e4;font-weight:700;white-space:nowrap}
tr:last-child td{border-bottom:none}
td.n{white-space:nowrap;font-variant-numeric:tabular-nums}
.good{color:#9be3b0;font-weight:700}.mid{color:#f5d27a;font-weight:700}.bad{color:#f3a78f;font-weight:700}
.cta{margin:36px 0;padding:22px;border-radius:16px;background:linear-gradient(135deg,#17224a,#0c1222);border:1px solid rgba(242,184,96,.35);text-align:center}
.cta p{margin:0 0 14px;color:#cdd5e4}
details{background:var(--panel);border:1px solid var(--rule);border-radius:12px;padding:12px 16px;margin:10px 0}
summary{cursor:pointer;font-weight:700}
footer{border-top:1px solid var(--rule);padding-block:22px 40px;color:var(--muted);font-size:13px}
footer nav{display:flex;flex-wrap:wrap;gap:8px 18px;margin-bottom:8px}
@media (max-width:600px){
  .tbl.cards{border:none;overflow:visible}
  .cards table{min-width:0}
  .cards table,.cards thead,.cards tbody,.cards tr,.cards td{display:block}
  .cards thead{display:none}
  .cards tr{background:var(--panel);border:1px solid var(--rule);border-radius:12px;padding:12px 14px;margin-bottom:10px}
  .cards td{border:none;padding:2px 0}
  .cards td:first-child{font-size:16px;margin-bottom:4px}
  .cards td.n{white-space:normal}
  .cards td:nth-child(2)::before{content:"極大：";color:var(--muted)}
  .cards td:nth-child(3)::before{content:"1時間あたり（理想的な空）：";color:var(--muted)}
  .cards td:nth-child(4)::before{content:"月明かり：";color:var(--muted)}
  .cards td:nth-child(5){color:var(--muted);font-size:14px;margin-top:4px}
}

@media (max-width:600px){.tbl:not(.cards) table{min-width:0}.tbl:not(.cards) th{white-space:normal}}