:root{
  --paper:#f6f3e8;
  --grid:#cfdbea;
  --grid-strong:#b7c8de;
  --ink:#14264a;
  --ink-soft:#3a4a6b;
  --red:#b32d1a;
  --card:#fbf9f1;
  --note-a:#f7e7a3;
  --note-b:#f4c9c1;
  --note-c:#c9e3d6;
  --serif:"Hiragino Mincho ProN","Hiragino Mincho Pro","Yu Mincho","YuMincho","Noto Serif JP","Noto Serif CJK JP","Source Han Serif JP","BIZ UDPMincho","MS PMincho",serif;
  --sans:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic Medium","Yu Gothic","Noto Sans JP","Noto Sans CJK JP","BIZ UDPGothic",Meiryo,system-ui,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Cascadia Mono",Menlo,Consolas,"Noto Sans Mono CJK JP","Liberation Mono",monospace;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;color:var(--ink);font-family:var(--sans);font-size:1rem;line-height:1.85;
  background-color:var(--paper);
  background-image:
    linear-gradient(var(--grid-strong) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-strong) 1px,transparent 1px),
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;
  background-position:-1px -1px;
  overflow-wrap:anywhere;
}
a{color:var(--ink)}
:focus-visible{outline:3px solid var(--red);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:8px;top:-60px;background:var(--ink);color:#fff;padding:8px 14px;z-index:10}
.skip:focus{top:8px}
.wrap{max-width:1060px;margin:0 auto;padding:0 16px}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.4;margin:0}
p{margin:0 0 1em}
code,.mono{font-family:var(--mono)}

/* top bar */
.bar{padding:14px 0 0}
.bar .wrap{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;justify-content:space-between}
.brand{font-family:var(--serif);font-weight:700;letter-spacing:.04em}
.brand small{font-family:var(--sans);font-weight:400;color:var(--ink-soft);font-size:.875rem;margin-left:.5em}
.tag-dev{display:inline-block;font-family:var(--serif);font-weight:700;color:var(--red);border:2.5px solid var(--red);padding:2px 14px;border-radius:6px 3px 7px 4px;transform:rotate(-3deg);letter-spacing:.2em;background:rgba(251,249,241,.7)}

/* hero */
.hero{padding:40px 0 24px}
.hero .wrap{display:grid;gap:28px;grid-template-columns:1fr}
.kicker{font-family:var(--mono);font-size:.875rem;color:var(--ink-soft);margin:0 0 10px}
h1{font-size:clamp(2.1rem,7vw,3.6rem);letter-spacing:.02em;line-height:1.3}
h1 .name{display:block;font-size:.5em;letter-spacing:.12em;margin-bottom:.4em;font-weight:500}
h1 .mark{background:linear-gradient(transparent 62%,rgba(179,45,26,.22) 62%,rgba(179,45,26,.22) 88%,transparent 88%);padding:0 .1em}
.lead{font-size:1.125rem;max-width:34em;margin-top:18px}
.status-note{display:inline-block;margin-top:6px;padding:12px 18px;background:var(--card);border:1.5px solid var(--ink);border-radius:255px 14px 225px 14px/14px 225px 14px 255px;box-shadow:3px 4px 0 rgba(20,38,74,.18)}
.status-note b{color:var(--red);font-family:var(--serif)}
.hero-art{max-width:420px;width:100%;justify-self:center}
.hero-art svg{width:100%;height:auto;display:block}

/* sections as notebook pages: label in the margin */
section{padding:44px 0;position:relative}
.row{display:grid;grid-template-columns:1fr;gap:14px}
.margin{font-family:var(--serif)}
.margin .no{display:inline-block;color:var(--red);font-size:1.5rem;line-height:1;margin-right:.4em;vertical-align:-.1em}
h2{font-size:1.4rem}
.margin .sub{font-family:var(--sans);font-size:.9375rem;color:var(--ink-soft);margin:6px 0 0;line-height:1.7}
.body > :last-child{margin-bottom:0}
.rule{border:0;height:10px;margin:0;background:none}
.rule svg{width:100%;height:10px;display:block}

/* problems */
.trouble{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.trouble li{background:var(--card);padding:14px 18px 14px 20px;border-left:4px solid var(--ink);border-radius:2px 10px 10px 2px;box-shadow:2px 3px 0 rgba(20,38,74,.12)}
.trouble li:nth-child(2){transform:rotate(.3deg)}
.trouble li:nth-child(3){transform:rotate(-.3deg)}
.trouble strong{font-family:var(--serif);display:block}

/* flow */
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr;gap:6px;align-items:stretch}
.step{background:var(--card);border:1.5px solid var(--ink);padding:16px 16px 18px;border-radius:12px 4px 14px 5px/5px 14px 4px 12px;box-shadow:3px 4px 0 rgba(20,38,74,.16)}
.step .pic{height:96px;margin-bottom:6px}
.step .pic svg{height:100%;width:auto;max-width:100%;display:block;margin:0 auto}
.step .n{font-family:var(--serif);color:var(--red);font-weight:700;font-size:.9375rem}
.step h3{font-size:1.1875rem;margin:2px 0 6px}
.step p{font-size:.9375rem;margin:0;line-height:1.75}
.arrow{display:flex;justify-content:center;align-items:center;min-height:36px}
.arrow svg{width:56px;height:36px;transform:rotate(90deg)}

/* sample screen */
.sample-tag{display:inline-block;font-family:var(--serif);font-weight:700;background:var(--ink);color:#fff;padding:2px 12px;border-radius:3px;font-size:.9375rem;margin-bottom:12px}
.screen{background:var(--card);border:2px solid var(--ink);border-radius:10px 4px 12px 5px/5px 12px 4px 10px;box-shadow:5px 6px 0 rgba(20,38,74,.2);overflow:hidden}
.screen-top{display:flex;gap:8px;align-items:center;padding:8px 14px;border-bottom:1.5px solid var(--ink);background:#eceadb;font-family:var(--mono);font-size:.8125rem;color:var(--ink-soft)}
.screen-top i{width:9px;height:9px;border:1.5px solid var(--ink);border-radius:50%;display:inline-block}
.screen-in{display:grid;grid-template-columns:1fr}
.themes{padding:14px;border-bottom:1.5px dashed var(--ink-soft)}
.themes h3,.tl h3{font-size:.9375rem;color:var(--ink-soft);margin-bottom:10px;letter-spacing:.08em}
.themes ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.theme{display:flex;justify-content:space-between;gap:8px;align-items:center;padding:8px 12px;border:1.5px solid var(--ink);border-radius:6px 3px 7px 3px;background:#fff;font-size:.9375rem;line-height:1.5}
.theme.on{background:var(--ink);color:#fff}
.theme .c{font-family:var(--mono);font-size:.8125rem;opacity:.85;white-space:nowrap}
.tl{padding:14px}
.tl .tools{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px;font-size:.875rem}
.pill{border:1.5px solid var(--ink-soft);border-radius:999px;padding:1px 12px;background:#fff;color:var(--ink-soft);line-height:1.7}
.post{padding:12px 0;border-top:1px solid var(--grid-strong);display:grid;gap:4px}
.post:first-of-type{border-top:0}
.post time{font-family:var(--mono);font-size:.8125rem;color:var(--ink-soft)}
.post p{margin:0;font-size:.9375rem;line-height:1.75}
.post .u{font-family:var(--mono);font-size:.8125rem;color:var(--ink-soft);text-decoration:underline;text-decoration-style:wavy;text-decoration-color:var(--red);text-underline-offset:4px}
.sticky{display:inline-block;font-size:.8125rem;font-weight:700;line-height:1.5;padding:1px 10px 2px;color:var(--ink);border-radius:2px 5px 2px 6px;box-shadow:1px 2px 0 rgba(20,38,74,.25);margin-right:8px;vertical-align:1px}
.sticky.a{background:var(--note-a);transform:rotate(-2deg)}
.sticky.b{background:var(--note-b);transform:rotate(1.5deg)}
.sticky.c{background:var(--note-c);transform:rotate(-1deg)}
.caption{font-size:.875rem;color:var(--ink-soft);margin-top:10px}
.can{list-style:none;margin:22px 0 0;padding:0;display:grid;gap:10px}
.can li{padding-left:1.7em;position:relative}
.can li::before{content:"";position:absolute;left:0;top:.62em;width:.9em;height:.5em;border-left:2.5px solid var(--red);border-bottom:2.5px solid var(--red);transform:rotate(-48deg) translateY(-30%)}

/* markdown excerpt */
.md{margin:22px 0 0;background:#fff;border:1.5px solid var(--ink);border-radius:4px 10px 4px 12px;padding:0}
.md .cap{font-family:var(--sans);font-size:.8125rem;color:var(--ink-soft);padding:6px 14px;border-bottom:1px dashed var(--ink-soft);display:flex;flex-wrap:wrap;gap:4px 12px;justify-content:space-between}
.md pre{margin:0;padding:12px 14px;font-family:var(--mono);font-size:.875rem;line-height:1.75;overflow-x:auto;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--ink)}
.md .h{color:var(--red);font-weight:700}

/* safety */
.safe{display:grid;gap:14px;margin:0;padding:0;list-style:none}
.safe li{background:var(--card);border:1.5px solid var(--ink);border-radius:10px 4px 12px 4px;padding:14px 18px;box-shadow:3px 4px 0 rgba(20,38,74,.14)}
.safe strong{font-family:var(--serif);display:block;margin-bottom:2px}
.fine{font-size:.9375rem;color:var(--ink-soft)}

/* faq */
.faq details{border-bottom:1.5px solid var(--ink);padding:0}
.faq details:first-child{border-top:1.5px solid var(--ink)}
.faq summary{cursor:pointer;list-style:none;padding:14px 38px 14px 4px;font-family:var(--serif);font-weight:700;position:relative;line-height:1.6}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:8px;top:10px;font-family:var(--mono);font-size:1.5rem;color:var(--red);line-height:1.4}
.faq details[open] summary::after{content:"\2212"}
.faq details p{padding:0 4px 14px;margin:0}

/* status */
.state{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.state li{padding-left:1.4em;position:relative}
.state li::before{content:"";position:absolute;left:0;top:.7em;width:.55em;height:.55em;border:2px solid var(--ink);border-radius:50%}
.state li.ng::before{border-color:var(--red);background:var(--red)}
.sth{font-size:1.0625rem;margin:22px 0 8px}
.sth:first-of-type{margin-top:0}

.contact{background:var(--card);border:2px solid var(--ink);border-radius:14px 4px 16px 5px/5px 16px 4px 14px;padding:20px 22px;box-shadow:4px 5px 0 rgba(20,38,74,.2)}
.contact .mail{font-family:var(--mono);font-size:1.0625rem;font-weight:700;background:#fff;border:1.5px dashed var(--ink);padding:6px 12px;display:inline-block;margin:6px 0;user-select:all;overflow-wrap:anywhere}

footer{padding:36px 0 48px;font-size:.9375rem;color:var(--ink-soft);border-top:2px solid var(--ink);margin-top:20px;background:rgba(246,243,232,.9)}
footer p{margin:0 0 .5em}

@media (min-width:900px){
  .hero .wrap{grid-template-columns:1.25fr .75fr;align-items:center}
  .row{grid-template-columns:210px 1fr;gap:36px}
  .margin{padding-top:2px;border-right:2px solid rgba(179,45,26,.55);padding-right:18px}
  .trouble{grid-template-columns:repeat(3,1fr)}
  .flow{grid-template-columns:1fr 64px 1fr 64px 1fr;gap:0}
  .arrow svg{transform:none}
  .safe{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:1000px){
  .row{grid-template-columns:250px 1fr}
}
@media (min-width:600px){
  .screen-in{grid-template-columns:210px 1fr}
  .themes{border-bottom:0;border-right:1.5px dashed var(--ink-soft)}
}
@media (prefers-reduced-motion:no-preference){
  .step,.trouble li,.safe li{transition:transform .2s ease}
  .step:hover{transform:translateY(-2px) rotate(-.3deg)}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}