/* sattoo.me — 生成り紙 × 墨 × 朱。印鑑（stamp）を刻印として全体に通すデザインシステム。
   既存デザイン見本のトークン・モチーフを継承し、オウンドメディアとして拡張。 */
:root{
  --paper:#F7F4EC;        /* 温かい生成り */
  --paper-2:#EFEBE0;
  --ink:#17181C;          /* 墨に近いインク */
  --ink-soft:#6E6E66;
  --mark:#F03A28;         /* 朱 / バーミリオン */
  --line:rgba(23,24,28,.12);
  --prose:#3b3c40;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--paper);color:var(--ink);
  font-family:"Zen Kaku Gothic New",sans-serif;
  font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased;
  position:relative;
}
/* 紙のグレイン（ごく薄いノイズで質感を足す） */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:9;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.05'/%3E%3C/svg%3E");
  mix-blend-mode:multiply;opacity:.5;
}
.wrap{max-width:1120px;margin:0 auto;padding:0 30px}
a{color:inherit;text-decoration:none}
::selection{background:var(--mark);color:#fff}
img{max-width:100%}

/* ---------- the mark (signature device) ---------- */
.stamp{
  border:3px solid var(--mark);border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  position:relative;color:var(--mark);
}
.stamp::before{content:"";position:absolute;inset:5px;border:1.5px solid var(--mark);border-radius:50%;opacity:.55}
.stamp span{
  writing-mode:vertical-rl;font-family:"Shippori Mincho",serif;font-weight:700;
  letter-spacing:.12em;line-height:1;
}

/* ---------- nav ---------- */
nav.top{display:flex;align-items:center;justify-content:space-between;padding:26px 0}
.logo{display:flex;align-items:center;gap:13px}
.logo .word{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:1.55rem;letter-spacing:-.02em;line-height:1}
.logo .word i{color:var(--mark);font-style:normal}
.logo .sub{font-size:.72rem;color:var(--ink-soft);letter-spacing:.18em;border-left:1px solid var(--line);padding-left:13px}
.navlinks{display:flex;gap:32px;font-size:.84rem;letter-spacing:.04em;color:var(--ink-soft)}
.navlinks a{position:relative;padding-bottom:4px}
.navlinks a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--mark);transition:width .35s ease}
.navlinks a:hover::after,.navlinks a:focus-visible::after{width:100%}

/* ---------- hero ---------- */
.hero{padding:78px 0 64px;position:relative}
.hero .eyebrow{font-family:"Bricolage Grotesque",sans-serif;font-weight:600;font-size:.8rem;letter-spacing:.34em;text-transform:uppercase;color:var(--mark);margin-bottom:24px}
.bigword{
  font-family:"Bricolage Grotesque",sans-serif;font-weight:800;
  font-size:clamp(5rem,21vw,15rem);line-height:.82;letter-spacing:-.03em;
}
.bigword .oo{color:var(--mark)}
.hero .read{display:flex;align-items:baseline;gap:18px;margin-top:26px;flex-wrap:wrap}
.hero .read .jp{font-family:"Shippori Mincho",serif;font-weight:600;font-size:1.5rem;letter-spacing:.04em}
.hero .read .eq{color:var(--ink-soft);font-size:1.1rem}
.lede{max-width:46ch;margin-top:34px;color:var(--prose);font-size:1.06rem;line-height:2.05}
.lede b{color:var(--ink);border-bottom:2px solid var(--mark);padding-bottom:1px;font-weight:700}
.hero-stamp{
  position:absolute;top:64px;right:6px;width:130px;height:130px;
  transform:rotate(-9deg);
  animation:stamp .85s cubic-bezier(.18,1.25,.4,1) .55s both;
}
.hero-stamp span{font-size:1.3rem}
@keyframes stamp{0%{opacity:0;transform:rotate(-9deg) scale(2)}55%{opacity:1}100%{opacity:1;transform:rotate(-9deg) scale(1)}}

/* ---------- divider band ---------- */
.band{background:var(--ink);color:var(--paper);margin-top:30px}
.band .wrap{display:flex;align-items:center;gap:26px;padding:22px 30px;flex-wrap:wrap}
.band .dot{width:9px;height:9px;border-radius:50%;background:var(--mark);flex:none}
.band p{font-family:"Shippori Mincho",serif;font-size:1.12rem;letter-spacing:.05em}
.band small{margin-left:auto;font-size:.74rem;letter-spacing:.18em;color:rgba(247,244,236,.6);font-family:"Bricolage Grotesque",sans-serif}

/* ---------- section ---------- */
section.block{padding:72px 0}
.sec-head{display:flex;align-items:center;gap:16px;margin-bottom:42px}
.sec-head .mk{width:26px;height:26px;border:2px solid var(--mark);border-radius:50%;flex:none;position:relative}
.sec-head .mk::after{content:"";position:absolute;inset:5px;border:1px solid var(--mark);border-radius:50%;opacity:.5}
.sec-title{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:1.4rem;letter-spacing:-.01em}
.sec-title em{font-style:normal;color:var(--ink-soft);font-weight:600;font-size:.95rem;margin-left:10px;letter-spacing:.04em}

/* ---------- featured（最新の一篇） ---------- */
.featured{
  display:block;position:relative;overflow:hidden;
  background:var(--paper-2);border:1px solid var(--line);border-radius:18px;
  padding:52px 56px;transition:transform .3s ease,box-shadow .3s ease;
}
.featured:hover{transform:translateY(-3px);box-shadow:0 18px 44px rgba(23,24,28,.09)}
.featured .f-stamp{
  position:absolute;right:-28px;bottom:-34px;width:200px;height:200px;
  opacity:.09;transform:rotate(-11deg);pointer-events:none;
}
.featured .f-stamp span{font-size:2rem}
.featured .meta{font-family:"Bricolage Grotesque",sans-serif;font-size:.78rem;letter-spacing:.05em;color:var(--ink-soft);display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.featured .cat{color:var(--mark);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;font-weight:600}
.featured h3{font-family:"Shippori Mincho",serif;font-weight:700;font-size:clamp(1.6rem,3.4vw,2.3rem);line-height:1.55;letter-spacing:.02em;margin-top:18px;max-width:24em}
.featured .ex{margin-top:18px;color:var(--prose);max-width:60ch;line-height:2}
.featured .more{display:inline-flex;align-items:center;gap:10px;margin-top:26px;font-family:"Bricolage Grotesque",sans-serif;font-weight:600;font-size:.86rem;letter-spacing:.06em}
.featured .more .go{width:36px;height:36px;font-size:1.1rem}
.featured:hover .more .go{background:var(--mark);transform:translateX(4px)}

/* ---------- articles list ---------- */
.post{display:grid;grid-template-columns:120px 1fr auto;gap:28px;align-items:center;padding:28px 0;border-top:1px solid var(--line);transition:padding-left .3s ease}
.post:last-child{border-bottom:1px solid var(--line)}
.post:hover{padding-left:10px}
.post .meta{font-family:"Bricolage Grotesque",sans-serif;font-size:.78rem;letter-spacing:.05em;color:var(--ink-soft)}
.post .cat{display:inline-block;margin-top:9px;color:var(--mark);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;font-weight:600}
.post h3{font-family:"Shippori Mincho",serif;font-weight:600;font-size:1.4rem;line-height:1.5;letter-spacing:.02em}
.post .ex{margin-top:8px;color:var(--ink-soft);font-size:.88rem;line-height:1.9;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post .go{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:1.3rem;color:var(--paper);background:var(--ink);width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background .25s ease,transform .25s ease;flex:none}
.post:hover .go{background:var(--mark);transform:translateX(4px)}
.post.hidden{display:none}

/* ---------- しるし（カテゴリ） ---------- */
.chips{display:flex;gap:14px;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;gap:10px;
  border:1.5px solid var(--line);border-radius:999px;padding:10px 20px 10px 12px;
  font-size:.88rem;letter-spacing:.04em;cursor:pointer;background:transparent;
  font-family:"Zen Kaku Gothic New",sans-serif;color:var(--ink);
  transition:border-color .25s ease,background .25s ease;
}
.chip .mk{width:18px;height:18px;border:1.5px solid var(--mark);border-radius:50%;position:relative;flex:none;opacity:.55;transition:opacity .25s ease}
.chip .mk::after{content:"";position:absolute;inset:3.5px;border:1px solid var(--mark);border-radius:50%;opacity:.5}
.chip .n{font-family:"Bricolage Grotesque",sans-serif;font-size:.72rem;color:var(--ink-soft)}
.chip:hover{border-color:var(--mark)}
.chip.on{border-color:var(--mark);background:rgba(240,58,40,.06)}
.chip.on .mk{opacity:1}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:1.3fr 1fr;gap:56px;align-items:start;background:var(--paper-2);border-radius:18px;padding:48px}
.about p{color:var(--prose);line-height:2.1}
.about p+p{margin-top:18px}
.facts dt{font-family:"Bricolage Grotesque",sans-serif;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);margin-top:22px}
.facts dt:first-child{margin-top:0}
.facts dd{font-family:"Shippori Mincho",serif;font-size:1.08rem;margin-top:3px}

/* ---------- article page ---------- */
.progress{position:fixed;top:0;left:0;height:3px;background:var(--mark);width:0;z-index:50}
.art-head{padding:64px 0 20px;max-width:760px;margin:0 auto}
.art-head .meta{font-family:"Bricolage Grotesque",sans-serif;font-size:.8rem;letter-spacing:.06em;color:var(--ink-soft);display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.art-head .cat{color:var(--mark);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;font-weight:600}
.art-head h1{font-family:"Shippori Mincho",serif;font-weight:700;font-size:clamp(1.7rem,4.4vw,2.6rem);line-height:1.6;letter-spacing:.02em;margin-top:22px}
.art-head .ex{margin-top:22px;color:var(--prose);line-height:2.05;border-left:3px solid var(--mark);padding-left:18px}

.keypoints{max-width:760px;margin:34px auto 0;background:var(--paper-2);border:1px solid var(--line);border-radius:14px;padding:26px 30px}
.keypoints .kp-t{display:flex;align-items:center;gap:10px;font-family:"Bricolage Grotesque",sans-serif;font-weight:600;font-size:.74rem;letter-spacing:.2em;text-transform:uppercase;color:var(--mark)}
.keypoints .kp-t .mk{width:16px;height:16px;border:1.5px solid var(--mark);border-radius:50%;position:relative}
.keypoints .kp-t .mk::after{content:"";position:absolute;inset:3px;border:1px solid var(--mark);border-radius:50%;opacity:.5}
.keypoints ul{list-style:none;margin-top:14px}
.keypoints li{position:relative;padding-left:20px;line-height:1.95;color:var(--prose);font-size:.94rem}
.keypoints li+li{margin-top:8px}
.keypoints li::before{content:"";position:absolute;left:2px;top:.78em;width:7px;height:7px;border-radius:50%;background:var(--mark)}

.prose{max-width:760px;margin:44px auto 0;color:var(--prose);font-size:1.02rem;line-height:2.15}
.prose p+p{margin-top:1.6em}
.prose h2{
  font-family:"Shippori Mincho",serif;font-weight:700;color:var(--ink);
  font-size:1.42rem;line-height:1.7;letter-spacing:.02em;
  margin:2.6em 0 1em;padding-left:20px;position:relative;
}
.prose h2::before{content:"";position:absolute;left:0;top:.42em;width:10px;height:10px;border:2px solid var(--mark);border-radius:50%}
.prose h3{font-family:"Shippori Mincho",serif;font-weight:600;color:var(--ink);font-size:1.16rem;margin:2.2em 0 .8em}
.prose strong{color:var(--ink);font-weight:700;border-bottom:2px solid var(--mark);padding-bottom:1px}
.prose a{color:var(--mark);border-bottom:1px solid rgba(240,58,40,.4)}
.prose blockquote{
  margin:2em 0;padding:20px 26px;background:var(--paper-2);border-left:3px solid var(--mark);border-radius:0 12px 12px 0;
  font-family:"Shippori Mincho",serif;font-size:1.05rem;color:var(--ink);
}
.prose ul,.prose ol{margin:1.4em 0;padding-left:1.5em}
.prose li+li{margin-top:.5em}
.prose hr{border:0;border-top:1px solid var(--line);margin:2.6em 0}
.prose code{background:var(--paper-2);border:1px solid var(--line);border-radius:6px;padding:.1em .45em;font-size:.9em}

/* 著者カード */
.author{max-width:760px;margin:70px auto 0;display:flex;gap:26px;align-items:center;background:var(--paper-2);border-radius:16px;padding:30px 34px}
.author .stamp{width:84px;height:84px;flex:none;transform:rotate(-8deg)}
.author .stamp span{font-size:.82rem}
.author .a-name{font-family:"Shippori Mincho",serif;font-weight:700;font-size:1.15rem}
.author .a-name small{font-family:"Bricolage Grotesque",sans-serif;font-weight:600;color:var(--ink-soft);font-size:.76rem;margin-left:10px;letter-spacing:.08em}
.author p{color:var(--prose);font-size:.9rem;line-height:1.95;margin-top:8px}

/* 前後ナビ */
.pn{max-width:760px;margin:56px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.pn a{border:1px solid var(--line);border-radius:14px;padding:20px 22px;transition:border-color .25s ease,transform .25s ease;display:block}
.pn a:hover{border-color:var(--mark);transform:translateY(-2px)}
.pn .dir{font-family:"Bricolage Grotesque",sans-serif;font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-soft)}
.pn .t{font-family:"Shippori Mincho",serif;font-weight:600;font-size:.98rem;line-height:1.7;margin-top:8px;color:var(--ink)}
.pn a.next{text-align:right}
.pn .ph{visibility:hidden}

/* 関連記事 */
.related{max-width:760px;margin:64px auto 0}
.related .sec-head{margin-bottom:8px}

/* ---------- footer ---------- */
footer{margin-top:96px;background:var(--ink);color:var(--paper)}
footer .wrap{padding:56px 30px 60px}
.foot-top{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:26px}
.foot-word{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:2.4rem;letter-spacing:-.02em}
.foot-word i{color:var(--mark);font-style:normal}
.foot-links{display:flex;gap:28px;font-size:.86rem;color:rgba(247,244,236,.72)}
.foot-links a:hover{color:var(--mark)}
.copy{margin-top:34px;padding-top:22px;border-top:1px solid rgba(247,244,236,.16);font-family:"Bricolage Grotesque",sans-serif;font-size:.74rem;letter-spacing:.05em;color:rgba(247,244,236,.5)}

/* ---------- motion ---------- */
.rise{opacity:0;transform:translateY(16px);animation:rise .9s ease forwards}
.rise.d1{animation-delay:.06s}.rise.d2{animation-delay:.16s}.rise.d3{animation-delay:.3s}
@keyframes rise{to{opacity:1;transform:none}}
.reveal{opacity:0;transform:translateY(14px);transition:opacity .8s ease,transform .8s ease}
.reveal.on{opacity:1;transform:none}

@media(max-width:760px){
  .hero-stamp{width:90px;height:90px;top:54px}
  .hero-stamp span{font-size:.95rem}
  .band small{display:none}
  .featured{padding:34px 28px}
  .post{grid-template-columns:1fr auto;gap:16px}
  .post .meta{grid-column:1/-1;display:flex;gap:14px;align-items:center}
  .post .cat{margin-top:0}
  .about{grid-template-columns:1fr;gap:32px;padding:34px}
  .logo .sub{display:none}
  .author{flex-direction:column;align-items:flex-start}
  .pn{grid-template-columns:1fr}
  .pn a.next{text-align:left}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .rise,.reveal{opacity:1;transform:none}
  .hero-stamp{opacity:1}
}