:root{
  --bg:#ffffff; --fg:#14181c; --muted:#5b6670; --line:#e4e8ec; --soft:#f6f8fa;
  --accent:#0f4c5c; --accent-fg:#ffffff;
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0e1214; --fg:#eef1f3; --muted:#9aa5ae; --line:#252d33; --soft:#161c20; --accent:#5fb3c7; --accent-fg:#0e1214;}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
a{color:var(--accent)}
h1{font-size:clamp(1.8rem,4.5vw,2.6rem);line-height:1.15;margin:0 0 14px;letter-spacing:-.02em;font-weight:650}
h2{font-size:1.4rem;margin:0 0 6px;font-weight:650}
h3{font-size:1rem;margin:18px 0 8px}
.small{font-size:.85rem;color:var(--muted)}

.top{position:sticky;top:0;background:var(--bg);border-bottom:1px solid var(--line);z-index:5}
.bar{display:flex;justify-content:space-between;align-items:center;height:56px}
.brand{font-weight:700;letter-spacing:.01em;color:var(--fg);text-decoration:none}
nav{display:flex;gap:18px;font-size:.92rem}
nav a{color:var(--muted);text-decoration:none}
nav a:hover{color:var(--fg)}
nav .cartlink{color:var(--fg);font-weight:600}

.hero{padding:56px 20px 24px}
.lede{font-size:1.1rem;color:var(--muted);max-width:640px}
.notice{margin-top:18px;padding:12px 14px;border:1px solid var(--line);background:var(--soft);border-radius:8px;font-size:.92rem;max-width:720px}

.how{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-top:16px;padding-bottom:24px}
.how div{border:1px solid var(--line);border-radius:10px;padding:16px}
.how span{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--accent-fg);font-size:.8rem;font-weight:700}
.how h3{margin:10px 0 4px}
.how p{margin:0;color:var(--muted);font-size:.9rem}

section{padding-top:28px;padding-bottom:12px}
.rowhead{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
input,textarea,button{font:inherit}
input[type=search],input:not([type=checkbox]),textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg)}
#search{max-width:260px}
input:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px}

.list{margin-top:14px;border-top:1px solid var(--line)}
.item{display:grid;grid-template-columns:1.3fr 2fr auto;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.item .nm{font-weight:600}
.sizes{display:flex;flex-wrap:wrap;gap:8px}
.size{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:8px;padding:6px 8px;font-size:.88rem;background:var(--bg)}
.size b{font-weight:650}
.size .sp{color:var(--muted)}
button{cursor:pointer;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--fg);padding:7px 12px}
button:hover{border-color:var(--accent)}
.add{padding:3px 9px;font-size:.85rem}
.primary{background:var(--accent);color:var(--accent-fg);border-color:var(--accent);font-weight:600;padding:11px 18px}
.primary:hover{opacity:.9}
.ghost{background:transparent}
.coa{font-size:.85rem;white-space:nowrap;text-decoration:none;display:inline-block;border:1px solid var(--line);border-radius:8px;padding:7px 12px;color:var(--fg)}
.coa:hover{border-color:var(--accent)}

.cartbox{border:1px solid var(--line);border-radius:10px;padding:14px;margin:12px 0 18px;background:var(--soft)}
.crow{display:grid;grid-template-columns:1fr auto auto auto;gap:12px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line);font-size:.92rem}
.crow:last-of-type{border-bottom:0}
.qty{display:flex;align-items:center;gap:6px}
.qty button{padding:2px 9px}
.ctotal{display:flex;justify-content:space-between;font-weight:650;padding-top:10px;border-top:1px solid var(--line);margin-top:6px}
.rm{border:0;background:transparent;color:var(--muted);padding:2px 6px}

form label{display:block;font-size:.88rem;font-weight:550;margin:10px 0}
form label input,form label textarea{margin-top:5px;font-weight:400}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.check{display:flex!important;gap:10px;align-items:flex-start;font-weight:400!important;padding:12px;border:1px solid var(--line);border-radius:8px}
.check input{width:auto;margin-top:4px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 6px}
.msg{min-height:1.4em;font-size:.9rem;color:var(--accent);margin:4px 0}
.msg.err{color:#c0392b}

footer{margin-top:40px;border-top:1px solid var(--line);padding:24px 0 40px}
.foot{display:grid;gap:12px}

.doc{max-width:760px;margin:0 auto;padding:36px 20px 60px}
.doc h2{margin-top:26px}

@media (max-width:760px){
  .how{grid-template-columns:1fr}
  .item{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  nav{gap:12px;font-size:.85rem}
  .crow{grid-template-columns:1fr auto;}
}