:root{--bg:#FBF6EC;--card:#FFFFFF;--ink:#2B3A55;--ink2:#5B6475;--line:#E8DCC8;--acc:#D8623A;--acc2:#F3D8C8;--warn:#C8362B;--sand:#F6EBD9;}
*{box-sizing:border-box}
html,body{margin:0;background:#E9E2D6;font-family:"Noto Sans JP",system-ui,-apple-system,sans-serif;color:var(--ink);-webkit-text-size-adjust:100%}
.guide{max-width:480px;margin:0 auto;background:var(--bg);min-height:100vh;position:relative}
.note-top{background:#2B3A55;color:#fff;font-size:12px;padding:8px 86px 8px 16px;text-align:left;line-height:1.5}
.hero{padding:calc(18px + env(safe-area-inset-top,0px)) 20px 8px;display:grid;grid-template-columns:1fr 92px;gap:12px;align-items:center}
.hero h1{margin:0;font-size:26px;line-height:1.25;font-weight:900;letter-spacing:.02em}
.hero p{margin:6px 0 0;font-size:13px;color:var(--ink2);line-height:1.6}
.hero img{width:92px;height:92px;border-radius:24px;display:block;object-fit:cover}
.toc{display:flex;gap:8px;overflow-x:auto;padding:10px 20px 14px;scrollbar-width:none;position:sticky;top:0;background:linear-gradient(var(--bg) 70%,rgba(251,246,236,0));z-index:5}
.toc::-webkit-scrollbar{display:none}
.toc a{flex:none;font-size:13px;font-weight:700;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:999px;padding:9px 13px;text-decoration:none;min-height:44px;display:inline-flex;align-items:center;gap:6px}
.toc a b{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--acc);color:#fff;font-size:11px}
.ch{margin:0 16px 14px;background:var(--card);border:1px solid var(--line);border-radius:20px;overflow:hidden}
.ch summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:34px 1fr 18px;gap:12px;align-items:center;padding:16px 16px;min-height:60px}
.ch summary::-webkit-details-marker{display:none}
.ch summary .n{width:34px;height:34px;border-radius:12px;background:var(--acc);color:#fff;display:grid;place-items:center;font-weight:900;font-size:16px}
.ch summary h2{margin:0;font-size:18px;font-weight:900;line-height:1.3}
.ch summary small{display:block;font-size:12px;color:var(--ink2);font-weight:400;margin-top:2px}
.ch summary .chev{width:18px;height:18px;border-right:2px solid var(--ink2);border-bottom:2px solid var(--ink2);transform:rotate(45deg);margin-top:-6px;transition:transform .2s}
.ch[open] summary .chev{transform:rotate(-135deg);margin-top:6px}
.ch .body{padding:0 16px 18px;border-top:1px solid var(--line)}
.lead{font-size:15px;line-height:1.75;margin:14px 0 6px}
.steps{list-style:none;margin:0;padding:0;counter-reset:s}
.step{position:relative;padding:12px 0 12px 44px;font-size:15px;line-height:1.7}
.step::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:11px;width:32px;height:32px;border-radius:50%;background:var(--sand);color:var(--acc);font-weight:900;display:grid;place-items:center;font-size:15px;border:2px solid var(--acc2)}
/* Screenshots are single images; annotations use measured viewport percentages. */
.shot{position:relative;margin:8px 0 6px;border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff;cursor:zoom-in}
.mark{position:absolute;width:56px;height:56px;border-radius:50%;border:4px solid var(--acc);transform:translate(-50%,-50%);box-shadow:0 0 0 3px rgba(255,255,255,.9),0 0 0 8px rgba(216,98,58,.18);animation:pulse 1.6s ease-out infinite;pointer-events:none}
.mark.on{border-color:var(--warn);animation-duration:.9s}
@keyframes pulse{0%{box-shadow:0 0 0 3px rgba(255,255,255,.9),0 0 0 6px rgba(216,98,58,.25)}100%{box-shadow:0 0 0 3px rgba(255,255,255,.9),0 0 0 22px rgba(216,98,58,0)}}
@media (prefers-reduced-motion:reduce){.mark{animation:none}}
.tag{position:absolute;transform:translate(-50%,0);background:var(--acc);color:#fff;font-size:13px;font-weight:700;padding:6px 10px;border-radius:999px;white-space:nowrap;box-shadow:0 2px 8px rgba(0,0,0,.18);pointer-events:none}
.tag::after{content:"";position:absolute;left:50%;top:-7px;transform:translateX(-50%);border:7px solid transparent;border-top:0;border-bottom-color:var(--acc)}
.tag.up::after{top:auto;bottom:-7px;border:7px solid transparent;border-bottom:0;border-top-color:var(--acc)}
/* 注意（赤字＋白フチ） */
.warn{margin:10px 0 4px;padding:12px 14px 12px 44px;background:#FFF4F2;border:1px solid #F3C9C3;border-radius:14px;color:var(--warn);font-weight:900;font-size:15px;line-height:1.6;position:relative;-webkit-text-stroke:3px #fff;paint-order:stroke fill;text-shadow:0 0 2px #fff}
.warn::before{content:"!";position:absolute;left:14px;top:12px;width:22px;height:22px;border-radius:50%;background:var(--warn);color:#fff;display:grid;place-items:center;font-size:15px;-webkit-text-stroke:0;text-shadow:none}
.warn b{font-weight:900}
.tip{margin:10px 0 4px;padding:12px 14px;background:var(--sand);border-radius:14px;font-size:14px;line-height:1.65;color:var(--ink)}
.photos{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0}
.cap{font-size:12px;color:var(--ink2);margin:4px 2px 0}
.faq dt{font-weight:700;margin-top:12px}
.faq dd{margin:4px 0 0;color:var(--ink2);line-height:1.65}
.foot{padding:20px 20px calc(28px + env(safe-area-inset-bottom,0px));font-size:13px;color:var(--ink2);line-height:1.8}
.foot a{color:var(--acc);text-decoration:none;font-weight:700}
.foot a:hover{text-decoration:underline}
a{color:var(--acc)}a:hover{color:#B84E2A}

/* Keep the mock's mobile layout at every requested iPhone width. */
[hidden]{display:none!important}
img{display:block;width:100%;height:auto}
button,a{-webkit-tap-highlight-color:transparent}
button{font:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.note-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:calc(6px + env(safe-area-inset-top,0px)) 16px 6px;min-height:56px}
.note-top a{color:#fff;text-decoration:none;font-weight:700}
.hero{padding-top:18px}
.hero>div,.ch summary>div{min-width:0}
.hero img{height:auto;object-fit:contain}
.toc{top:0;padding-top:calc(10px + env(safe-area-inset-top,0px));scroll-padding-inline:20px}
.ch,.shot{scroll-margin-top:calc(90px + env(safe-area-inset-top,0px))}
.ch summary{gap:10px;padding-inline:14px}
.ch summary small{line-height:1.65}
h3{font-size:17px;line-height:1.6;margin:22px 0 8px}
/* Fragment links reveal chapter content without JavaScript.
   ::details-content overrides the native closed-content visibility. */
.ch:target>.body,.ch:has(:target)>.body{display:block}
.ch:target::details-content,.ch:has(:target)::details-content{content-visibility:visible;display:block}
.ch:target summary .chev,.ch:has(:target) summary .chev{transform:rotate(-135deg);margin-top:6px}
.step-link{display:block;text-decoration:none;color:inherit;border-radius:8px}
.step-link:hover{color:inherit}
.see{display:table;margin-top:6px;font-size:11px;line-height:1.5;color:var(--acc);border:1px solid var(--acc2);border-radius:999px;padding:4px 9px;background:#fff}
.step.on::before{background:var(--acc);color:#fff}
.step.on .see{background:var(--acc);color:#fff}
.shot{margin-inline:0}
.zoom-link{display:block;cursor:zoom-in;border-radius:inherit}
.zoom-link:focus-visible{outline-offset:-4px}
.mark{width:14%;height:auto;aspect-ratio:1;border-width:3px}
.mark.on{border-width:5px;background:rgba(200,54,43,.12)}
.tag{font-size:12px;line-height:1.5;max-width:78%;padding:5px 8px;white-space:normal;text-align:center}
.photos{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.photos a{border-radius:14px;overflow:hidden}
.illustration{margin:16px 0 6px}
.illustration img{border-radius:14px}
.faq{font-size:14px}
.foot nav{display:flex;flex-wrap:wrap;gap:4px 16px}
.foot a{display:inline-block;padding-block:6px}
.foot p{margin-bottom:0}
.guide{padding-left:env(safe-area-inset-left,0px);padding-right:env(safe-area-inset-right,0px)}
dialog{border:1px solid var(--line);border-radius:18px;padding:0;background:var(--bg);color:var(--ink);width:min(96vw,780px);max-width:96vw;max-height:calc(100dvh - 32px - env(safe-area-inset-top,0px) - env(safe-area-inset-bottom,0px));overscroll-behavior:contain}
dialog::backdrop{background:rgba(0,0,0,.7)}
dialog form{position:sticky;top:0;display:flex;justify-content:flex-end;background:var(--bg);padding:6px 10px;margin:0}
.zoom-close{min-height:44px;padding:6px 18px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--ink)}
body:has(dialog[open]){overflow:hidden}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.chev{transition:none}}