/* 딱계산 놀이터 공용 모양 (외부 글꼴·자원 없음) */
:root{--b:#2563eb;--bg:#f6f7fb;--t:#111827;--m:#6b7280;--l:#e5e7eb;--ac:#f59e0b}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--t);font-family:-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;-webkit-text-size-adjust:100%}
main{max-width:480px;margin:0 auto;padding:20px 16px 60px}
a{color:var(--b)}
h1{font-size:22px;margin:8px 0 4px;word-break:keep-all}
h2{font-size:15px;margin:0 0 10px}
p.s{margin:0 0 16px;color:var(--m);font-size:14px;word-break:keep-all}
.back{display:inline-block;margin-bottom:6px;text-decoration:none;font-size:14px}
.logo{font-size:26px;font-weight:800;margin:4px 0}.logo span{color:var(--b)}
.card{background:#fff;border-radius:16px;padding:16px;margin-bottom:14px;box-shadow:0 1px 3px #0001}
.lab{font-size:13px;color:var(--m);margin:2px 0 6px}
.f{display:flex;align-items:center;border:2px solid var(--l);border-radius:12px;padding:0 14px;margin-bottom:10px;background:#fff;min-width:0}
.f:focus-within{border-color:var(--b)}
.f input{flex:1;min-width:0;width:100%;border:0;outline:0;font-size:22px;font-weight:700;padding:12px 0;background:transparent;color:var(--t);font-family:inherit}
.btn{display:block;width:100%;border:0;border-radius:12px;padding:14px;font-size:17px;font-weight:700;background:var(--b);color:#fff;cursor:pointer;font-family:inherit}
.btn:active{opacity:.85}
.btn.sub{background:#eef2ff;color:var(--b)}
.btns{display:flex;gap:8px;margin-top:12px}
.btns .btn{flex:1;font-size:15px;padding:12px 4px;word-break:keep-all}
.err{color:#b91c1c;font-size:14px;min-height:20px;margin:8px 0 0}
.result{display:none}
.result.on{display:block}
.big{font-size:28px;font-weight:800;line-height:1.3;margin:2px 0 6px;word-break:keep-all}
.big em{font-style:normal;color:var(--b)}
.one{font-size:16px;font-weight:700;margin:0 0 4px;word-break:keep-all}
.exact{font-size:13px;color:var(--m);margin:0 0 12px}
.rows{border-top:1px solid var(--l)}
.rowx{display:flex;justify-content:space-between;align-items:baseline;gap:10px;padding:10px 0;border-bottom:1px solid var(--l);font-size:14px}
.rowx b{white-space:nowrap;text-align:right}
.rowx.me{color:var(--b);font-weight:700}
.note{font-size:12px;color:var(--m);line-height:1.6;margin:10px 0 0;word-break:keep-all}
.chk{display:flex;align-items:center;gap:8px;font-size:14px;margin-top:12px;color:#374151}
.chk input{width:18px;height:18px;margin:0}
.preview{display:none;margin-top:12px}
.preview.on{display:block}
.preview img{width:100%;height:auto;border-radius:12px;border:1px solid var(--l);display:block}
.pyr{width:100%;height:auto;display:block}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:#111827;color:#fff;padding:10px 16px;border-radius:999px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:9;max-width:90vw;text-align:center}
.toast.on{opacity:.95}
a.tool{display:flex;align-items:center;gap:14px;background:#fff;border-radius:16px;padding:16px;margin-bottom:12px;box-shadow:0 1px 3px #0001;text-decoration:none;color:var(--t)}
a.tool .ic{width:48px;height:48px;border-radius:12px;background:#eef2ff;display:flex;align-items:center;justify-content:center;font-size:24px;flex:0 0 auto}
a.tool b{display:block;font-size:17px;word-break:keep-all}
a.tool small{color:var(--m);font-size:13px}
a.tool .go{margin-left:auto;color:var(--b);font-size:22px}
.soon{background:#fff;border:1px dashed var(--l);border-radius:16px;padding:14px 16px;color:var(--m);font-size:14px}
article{font-size:15px;line-height:1.75}
article h2{font-size:17px;margin:14px 0 8px}
article h2:first-child{margin-top:0}
article p{margin:0 0 10px;word-break:keep-all}
.src{font-size:12px;color:var(--m);line-height:1.6;border-top:1px solid var(--l);padding-top:10px;margin-top:6px}
footer{text-align:center;color:var(--m);font-size:12px;margin-top:24px}
footer a{color:inherit}