:root{--bg:#f7f8fa;--fg:#1c2330;--muted:#4a5568;--accent:#1456b8;--card:#fff;--line:#d9dee7}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Hiragino Sans","Noto Sans JP","Yu Gothic",sans-serif;background:var(--bg);color:var(--fg);line-height:1.75}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:6px;z-index:9}
.header{background:#fff;border-bottom:1px solid var(--line);padding:12px 16px;display:flex;flex-wrap:wrap;gap:8px 20px;align-items:center}
.brand{font-weight:700;font-size:1.25rem;color:var(--fg);text-decoration:none}
.tag{font-size:.7rem;margin-left:6px;padding:1px 6px;border:1px solid var(--line);border-radius:10px;color:var(--muted);vertical-align:middle}
.nav{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:.92rem}
.nav a{color:var(--accent);text-decoration:none}.nav a:hover{text-decoration:underline}
.wrap{max-width:860px;margin:0 auto;padding:20px 16px 40px}
h1{font-size:1.7rem;line-height:1.35;margin:.4em 0}h2{font-size:1.25rem;margin:1.6em 0 .4em;border-left:4px solid var(--accent);padding-left:10px}h3{font-size:1.05rem}
.lead{font-size:1.05rem;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;margin:12px 0}
.row{display:grid;grid-template-columns:1fr;gap:8px;padding:12px 0;border-bottom:1px dashed var(--line)}
.row:last-of-type{border-bottom:0}
@media(min-width:640px){.row{grid-template-columns:2fr 1fr 1fr auto;align-items:end}}
label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:2px}
input,textarea,button,select{font:inherit}
input[type=text],input[type=number],textarea{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:6px;background:#fff}
input:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button,.btn{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:6px;padding:9px 16px;cursor:pointer;text-decoration:none}
button.sub{background:#fff;color:var(--accent);border:1px solid var(--accent)}
button:disabled,input:disabled{opacity:.55;cursor:not-allowed}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.result-total{font-size:1.4rem;font-weight:700;color:var(--accent)}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
.scroll{overflow-x:auto}
.muted,.note{color:var(--muted);font-size:.9rem}
.note{background:#fff8e6;border:1px solid #f0d99a;border-radius:6px;padding:10px 12px}
.crumb{font-size:.85rem;color:var(--muted)}
.cats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;padding:0;list-style:none}
.cats a{display:block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px;text-decoration:none;color:var(--fg);text-align:center}
.cats a:hover{border-color:var(--accent)}
.footer{border-top:1px solid var(--line);background:#fff;padding:16px;font-size:.85rem;color:var(--muted);text-align:center}
.hidden{display:none}

.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.crumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap}
.crumb li+li::before{content:">";margin:0 .5em;color:var(--muted)}
.crumb a{color:var(--accent)}
a{color:var(--accent)}
:focus-visible{outline:3px solid #b45309;outline-offset:2px}
input:focus,textarea:focus{outline:3px solid #b45309;outline-offset:1px;border-color:var(--fg)}
#result:focus{outline:none}
button,.btn{min-height:44px;line-height:1.4}
button:hover,.btn:hover{background:#0f4496}
button.sub:hover{background:#eaf1fc}
input[type=text],input[type=number],input[type=email],textarea{min-height:44px;font-size:1rem}
textarea{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.88rem;min-height:0}
.skip{position:absolute;left:-999px;top:auto}
.nav a{padding:6px 2px;display:inline-block}
.cats a{min-height:44px}
.guide{border-color:#b45309}
summary{cursor:pointer;padding:6px 0}
ol{padding-left:1.4em}
.footer p{margin:.3em 0}
@media(max-width:480px){h1{font-size:1.4rem}.wrap{padding:14px 12px 32px}.actions button,.actions .btn{flex:1 1 100%}.nav{font-size:.88rem}table{font-size:.85rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
/* #8 レイアウト修正: カテゴリ一覧を均等グリッドに、メール入力欄を幅いっぱいに */
.cats{grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:1fr;gap:10px}
.cats li{display:flex;min-width:0}
.cats a{flex:1;display:flex;align-items:center;justify-content:center;padding:10px 12px;line-height:1.4;word-break:keep-all;overflow-wrap:anywhere}
input[type=email]{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:6px;background:#fff}
@media(max-width:560px){.cats{grid-template-columns:repeat(2,minmax(0,1fr))}.cats li:last-child:nth-child(odd){grid-column:1/-1}.cats a{font-size:.95rem}}
@media(min-width:640px){.row{grid-template-columns:3fr 1fr 1fr auto}}