/* 二次会さん 共通スタイル：色と文字、サイトのヘッダー・フッター、説明ページ */
:root{
  --bg:#EDEFF6; --surface:#FFFFFF; --ink:#1B1F3A; --muted:#5E6385; --line:#D7DAE8;
  --lantern:#E3901A; --lantern-ink:#2A1A00; --maybe:#6B5FC7; --maybe-soft:#ECEAFB; --no:#8A8FA8;
  --go-soft:#FFF1DA; --ok:#23895A; --ok-soft:#DDF3E7; --warn:#C2412D;
  --night:#0E1124; --night-ink:#E6E7F2; --night-muted:#9EA2C2;
  --display:"M PLUS Rounded 1c","Hiragino Maru Gothic ProN","Hiragino Sans","Yu Gothic",sans-serif;
  --body:"Noto Sans JP","Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic","Meiryo",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#121529; --surface:#1C2040; --ink:#ECEBF5; --muted:#A3A6C4; --line:#2E3360;
  --lantern:#F4B23E; --lantern-ink:#2A1A00; --maybe:#A79CF2; --maybe-soft:#2A2850; --no:#7C80A0;
  --go-soft:#3A2C12; --ok:#5ACB92; --ok-soft:#173A2A; --warn:#F07A63;
  --night:#0A0C1C; --night-ink:#E6E7F2; --night-muted:#9EA2C2; color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#121529; --surface:#1C2040; --ink:#ECEBF5; --muted:#A3A6C4; --line:#2E3360;
  --lantern:#F4B23E; --lantern-ink:#2A1A00; --maybe:#A79CF2; --maybe-soft:#2A2850; --no:#7C80A0;
  --go-soft:#3A2C12; --ok:#5ACB92; --ok-soft:#173A2A; --warn:#F07A63;
  --night:#0A0C1C; --night-ink:#E6E7F2; --night-muted:#9EA2C2; color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.7;
  padding-top:env(safe-area-inset-top,0px)}
img{max-width:100%}
a{color:inherit}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--lantern);outline-offset:2px}

/* site header */
.site-head{padding-inline:16px;padding-block:14px}
.site-head .in{max-width:960px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.logo{font-family:var(--display);font-weight:800;font-size:16px;letter-spacing:.04em;display:inline-flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink)}
.lamp{width:14px;height:18px;border-radius:7px;background:var(--lantern);box-shadow:0 0 12px var(--lantern);flex:none}
.head-link{font-size:14px;font-weight:700;text-decoration:none;color:var(--muted)}
.head-link:hover{color:var(--ink)}

/* buttons */
.btn,a.btn{font:inherit;font-weight:700;font-size:15px;text-decoration:none;text-align:center;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px}
.btn.primary,a.btn.primary{background:var(--lantern);border-color:var(--lantern);color:var(--lantern-ink)}
.btn.small{font-size:13px;padding:8px 12px;font-weight:500}
.btn:disabled{opacity:.6;cursor:default}
.field{width:100%;font:inherit;font-size:16px;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}
.field:focus{outline:2px solid var(--lantern);border-color:transparent}
textarea.field{min-height:10em;resize:vertical;line-height:1.6}
.lbl{font-size:13px;color:var(--muted)}
.hint{font-size:13px;color:var(--muted);margin:0}

/* footer (dark, like a night street) */
.site-foot{background:var(--night);color:var(--night-ink);padding-inline:16px;padding-block:40px calc(32px + env(safe-area-inset-bottom,0px));margin-top:56px}
.site-foot .in{max-width:960px;margin:0 auto;display:flex;flex-direction:column;gap:28px}
.foot-brand{display:flex;flex-direction:column;gap:6px}
.foot-brand .logo{color:var(--night-ink)}
.foot-brand p{margin:0;font-size:13px;color:var(--night-muted)}
.foot-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 24px;margin:0;padding:0;list-style:none}
.foot-links a{display:block;padding:8px 0;text-decoration:none;color:var(--night-ink);font-size:15px}
.foot-links a:hover{color:var(--lantern)}
.copy{font-size:12px;color:var(--night-muted)}
@media (min-width:720px){.foot-links{grid-template-columns:repeat(3,minmax(0,1fr))}}

/* document pages (privacy, terms, faq, about, contact) */
.doc{padding-inline:16px}
.doc .in{max-width:720px;margin:0 auto;background:var(--surface);border-radius:20px;padding:28px 24px 36px}
.doc h1{font-family:var(--display);font-weight:800;font-size:26px;line-height:1.35;margin:0 0 6px;text-wrap:balance}
.doc .updated{font-size:13px;color:var(--muted);margin:0 0 24px}
.doc h2{font-size:17px;margin:32px 0 8px;padding-top:4px;text-wrap:balance}
.doc h3{font-size:15px;margin:20px 0 6px}
.doc p,.doc li{max-width:65ch}
.doc ol,.doc ul{padding-left:1.4em}
.doc li{margin:4px 0}
.doc .todo{background:var(--go-soft);border-radius:4px;padding:0 4px;font-weight:700}
.doc dl{display:grid;grid-template-columns:minmax(6em,auto) 1fr;gap:10px 18px;margin:0}
.doc dt{color:var(--muted);font-size:14px}
.doc dd{margin:0;overflow-wrap:anywhere}
.doc details{border-top:1px solid var(--line);padding:14px 0}
.doc details:last-of-type{border-bottom:1px solid var(--line)}
.doc summary{cursor:pointer;font-weight:700;list-style:none;display:flex;gap:10px}
.doc summary::before{content:"Q";font-family:var(--display);font-weight:800;color:var(--lantern);flex:none}
.doc summary::-webkit-details-marker{display:none}
.doc details p{margin:8px 0 0 1.6em;color:var(--ink)}
@media (max-width:480px){.doc .in{padding:22px 18px 28px}.doc dl{grid-template-columns:1fr;gap:2px}.doc dd{margin-bottom:10px}}