/* 交際のしおり 下書き（2026-11-05）
   方向：紙ばさみと確認票。薔薇がかった灰色の地・茶黒の文字・緑はボタンだけ。明朝の読み物。線の箱は使わず、色の段差と点線の切り取り線で区切る。 */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#ebe5e3;--surface:#e1dad7;--paper:#f7f3f1;
  --ink:#2b2622;--muted:#5f5652;--accent:#0f7d45;--accent-ink:#fff;
  --t1:#c9bcb6;--t2:#b7a8a1;--t3:#a8968e;--t4:#d6ccc8;--t5:#bfb1ab;
  --disp:'Young Serif','Zen Old Mincho','Hiragino Mincho ProN','Yu Mincho',serif;
  --text:'Zen Old Mincho','Hiragino Mincho ProN','Yu Mincho',serif;
  --m:clamp(16px,4vw,40px);
  --s-small:clamp(.8125rem,.79rem + .1vw,.875rem);
  --s-body:clamp(1.0625rem,1.02rem + .25vw,1.1875rem);
  --s-lead:clamp(1.1875rem,1.05rem + .6vw,1.5rem);
  --s-head:clamp(1.625rem,1.2rem + 2vw,2.75rem);
}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--text);font-size:var(--s-body);line-height:1.85;overflow-x:hidden}
:lang(ja){word-break:keep-all;overflow-wrap:normal;line-break:strict}
.nb{white-space:nowrap}
a{color:var(--ink);text-decoration-thickness:1px;text-underline-offset:.2em}
a:hover{color:var(--accent)}
a:focus-visible,.btn:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}

/* 広告表記：最上部・左寄せ・面の色だけで区切る */
.pr-bar{background:var(--surface);padding:10px var(--m);font-size:var(--s-small);font-weight:700;display:flex;flex-wrap:wrap;gap:4px 16px;align-items:center}
.pr-bar a{font-weight:400;padding:10px 0}

.mast{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;padding:18px var(--m)}
.mark{display:inline-flex;align-items:center;min-height:44px;font-family:var(--disp);font-size:1.375rem;text-decoration:none;letter-spacing:.02em}
.mast nav{display:flex;flex-wrap:wrap;gap:0 20px}
.mast nav a{font-size:var(--s-small);text-decoration:none;padding:12px 0;min-height:44px;display:inline-flex;align-items:center}

.wrap{max-width:1120px;margin:0 auto;padding:0 var(--m)}
h1,h2{font-family:var(--disp);font-weight:400;letter-spacing:-.01em;line-height:1.3}
h2{font-size:var(--s-head);margin:2.2em 0 .7em}
p+p{margin-top:.2em}
.small{font-size:var(--s-small);color:var(--muted);margin-top:12px}

/* ===== トップ：紙ばさみの束 ===== */
.hero{background:var(--ink);color:var(--paper);padding:72px var(--m) 0;text-align:center;overflow:hidden}
.hero h1{font-size:clamp(2.5rem,1.4rem + 6vw,6rem);line-height:1.05}
.hero .lede{max-width:34em;margin:24px auto 0;font-size:var(--s-lead);line-height:1.7;color:#efe8e5}
.stack-folders{position:relative;max-width:1080px;margin:56px auto 0;text-align:left}
.folder{display:block;position:relative;height:56px;margin-top:-6px;text-decoration:none;color:var(--ink)}
.folder .tab{position:absolute;top:-34px;height:40px;padding:8px 22px 0;font-size:1rem;clip-path:polygon(10% 0,90% 0,100% 100%,0 100%);background:inherit;white-space:nowrap}
.f0{background:var(--t1);margin-top:40px}.f0 .tab{left:2%}
.f1{background:var(--t2)}.f1 .tab{left:22%}
.f2{background:var(--t3)}.f2 .tab{left:44%}
.f3{background:var(--t4)}.f3 .tab{left:64%}
.f4{background:var(--t5)}.f4 .tab{right:2%}
.folder:hover{filter:brightness(1.05)}
.folder.front{background:var(--paper);height:auto;padding:40px 32px 56px;margin-top:-6px}
.folder.front .tab{left:8%;background:var(--paper)}
.folder.front p{max-width:30em;margin-bottom:20px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 24px;background:var(--accent);color:var(--accent-ink);text-decoration:none;font-weight:700;border-radius:0;transition:transform .15s ease,background .15s ease;line-height:1.5}
.btn:hover{color:#fff;background:#0c6a3a}
.btn:active{transform:translateY(1px)}
.btn-quiet{background:var(--ink)}
.btn-quiet:hover{background:#463f3a}

.intro{padding-top:120px}
.intro h2{margin-top:0}
.note{max-width:30em}
.facts{display:flex;flex-wrap:wrap;justify-content:space-between;gap:32px;margin-top:64px}
.fact{font-family:var(--disp);font-size:clamp(1.75rem,1.2rem + 2vw,2.75rem);line-height:1.1}
.fact-n{font-size:var(--s-small);color:var(--muted)}

.index{list-style:none;margin-top:24px}
.index li a{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 24px;padding:18px 20px;text-decoration:none;background:var(--paper);margin-top:8px;transition:transform .2s ease}
.index li:nth-child(even) a{background:var(--surface)}
.index li a:hover{transform:translateX(6px)}
.ix-t{font-family:var(--disp);font-size:var(--s-lead)}
.ix-d{font-size:var(--s-small);color:var(--muted);align-self:center}

.pick{padding-top:24px}
.clublist{list-style:none;columns:2 300px;column-gap:40px;margin:24px 0}
.clublist li{break-inside:avoid;padding:10px 0}
.cl-n{font-family:var(--disp);font-size:1.125rem}
.cl-b{font-size:var(--s-small);color:var(--muted)}
.pick-btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}

.faq{padding-bottom:40px}
details{padding:14px 0;margin-top:12px}
summary{cursor:pointer;font-family:var(--disp);font-size:var(--s-lead);min-height:44px;list-style:none;position:relative;padding-right:32px}
summary::-webkit-details-marker{display:none}
summary::after{content:'+';position:absolute;right:4px;top:0}
details[open] summary::after{content:'−'}
details p{color:var(--muted);margin-top:8px}

/* ===== 記事：1枚の紙 ===== */
.crumbs{font-size:var(--s-small);padding:8px 0 16px;color:var(--muted)}
.crumbs a{display:inline-block;padding:10px 0}
.crumbs .sep{margin:0 8px}
.sheet{background:var(--paper);padding:48px clamp(20px,5vw,72px) 64px;max-width:860px;margin:0 auto 96px}
.sheet.wide{max-width:1120px}
.sheet h1{font-size:clamp(1.875rem,1.3rem + 2.6vw,3.25rem)}
.stamp{font-size:var(--s-small);color:var(--muted);margin:14px 0 32px}
.sheet ul,.sheet ol{padding-left:1.3em;margin:12px 0}
.sheet li{margin:6px 0}

/* 確認票：上下に点線の切り取り線 */
.slip{background:var(--surface);margin:28px 0;padding:28px 24px;border-top:6px dotted var(--bg);border-bottom:6px dotted var(--bg)}
.slip-h{font-family:var(--disp);font-size:1.25rem;margin-bottom:8px}
.sheet .checks{list-style:none;padding:0}
.checks li{display:grid;grid-template-columns:28px 1fr;gap:14px;margin:18px 0}
.box{width:22px;height:22px;background:var(--paper);margin-top:6px}
.ck-h{font-weight:700}

.tbl{margin:20px 0}
table{border-collapse:collapse;width:100%;font-size:1rem;line-height:1.7}
caption{text-align:left;font-size:var(--s-small);color:var(--muted);padding-bottom:8px}
th,td{text-align:left;vertical-align:top;padding:12px 14px;border-bottom:1px solid var(--t4)}
thead th{background:var(--surface);font-weight:700}
.stack.big{font-size:.9375rem}
.stack.big td .btn{min-height:44px;padding:8px 14px;font-size:.9375rem}

.src{list-style:none;padding:0!important;font-size:var(--s-small)}
.src li{margin:10px 0}
.src-n{display:block;font-weight:700}
.src a,.src-u{word-break:break-all}

.nextup{background:var(--surface);padding:24px;margin-top:48px}
.nextup h2{margin:0 0 8px;font-size:1.375rem}

/* ===== フッター：紙の裏 ===== */
.back{padding:0 var(--m) 56px}
.back-card{position:relative;max-width:1000px;margin:0 auto;background:var(--paper);padding:56px clamp(20px,5vw,56px) 28px;display:grid;grid-template-columns:1fr 1fr;gap:32px;
  -webkit-mask:radial-gradient(circle 14px at 50% 0,transparent 98%,#000) 0 0/42px 100% repeat-x;mask:radial-gradient(circle 14px at 50% 0,transparent 98%,#000) 0 0/42px 100% repeat-x}
.back-sign{font-family:var(--disp);font-size:1.75rem;line-height:1.3;margin-bottom:12px}
.back-links{list-style:none}
.back-links a{display:inline-flex;min-height:44px;align-items:center;font-size:1.0625rem}
.imprint{grid-column:1/-1;text-align:center;font-size:var(--s-small);color:var(--muted)}

.cl-n a,.nextup li a,.src a,tbody th a{display:inline-block;padding:10px 0;min-height:44px}
.sheet .nextup li{margin:0}
/* ===== スマホ ===== */
@media (max-width:760px){
  .hero{padding-top:56px}
  .folder{height:46px}
  .folder .tab{top:-30px;height:34px;padding:6px 14px 0;font-size:.875rem}
  .f0 .tab{left:0}.f1 .tab{left:auto;right:0}.f2 .tab{left:18%}.f3 .tab{left:auto;right:12%}.f4 .tab{left:4%;right:auto}
  .folder.front{padding:36px 20px 44px}
  .folder.front .btn{width:100%}
  .facts{display:grid;grid-template-columns:1fr 1fr;gap:28px 16px}
  .intro{padding-top:80px}
  table.stack thead{display:none}
  table.stack,table.stack tbody,table.stack tr,table.stack td,table.stack th{display:block;width:100%}
  table.stack tr{background:var(--bg);margin-bottom:12px;padding:8px 0}
  table.stack td,table.stack th{border:0;padding:6px 14px}
  table.stack td[data-label]::before{content:attr(data-label);display:block;font-size:var(--s-small);color:var(--muted);font-weight:700}
  table.stack tbody th[data-label]{font-family:var(--disp);font-size:1.25rem;font-weight:400}
  .stack.big td .btn{width:100%}
  .back-card{grid-template-columns:1fr}
  .sheet{padding:32px 18px 48px}
  .slip{margin:24px -6px;padding:20px 14px}
  .checks li{grid-template-columns:20px 1fr;gap:10px}
  .box{width:18px;height:18px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}