:root{--bg:#f6f8fb;--fg:#14202e;--mut:#506070;--card:#fff;--line:#d5dde6;--acc:#1b5fd1;--go:#1f9d55;--wait:#c0392b;--early:#b8860b}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Apple SD Gothic Neo","Malgun Gothic","Noto Sans CJK KR",sans-serif;word-break:keep-all}
a{color:var(--acc)}
.wrap{max-width:720px;margin:0 auto;padding:0 16px}
header.site{background:var(--card);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;min-height:48px;gap:12px}
.brand{font-weight:700;color:var(--fg);text-decoration:none}
nav.top a{margin-left:14px;text-decoration:none;font-size:15px;padding:10px 0;display:inline-block}
nav.top a[aria-current="page"]{font-weight:700;color:var(--fg)}
h1{font-size:1.45rem;line-height:1.25;margin:14px 0 4px}
h2{font-size:1.2rem;margin:28px 0 8px}
h3{font-size:1.05rem;margin:18px 0 4px}
.answer{margin:0 0 12px;color:var(--mut);font-size:.95rem;line-height:1.5}
.tool{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px}
.readout{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:0 0 10px;text-align:center}
.readout div{background:var(--bg);border-radius:8px;padding:6px 4px}
.readout dt{font-size:.75rem;color:var(--mut)}
.readout dd{margin:0;font-size:1.25rem;font-weight:700;font-variant-numeric:tabular-nums}
.pad{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;height:200px;border:0;border-radius:10px;color:#fff;font:inherit;font-size:1.2rem;font-weight:700;text-align:center;cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent;padding:12px}
.pad small{display:block;font-weight:400;font-size:.9rem;margin-top:6px;opacity:.95}
.pad:focus-visible,.btn:focus-visible{outline:3px solid #000;outline-offset:2px}
.pad[data-state="idle"],.pad[data-state="done"]{background:var(--acc)}
.pad[data-state="waiting"]{background:var(--wait)}
.pad[data-state="ready"]{background:var(--go)}
.pad[data-state="early"]{background:var(--early)}
.pad[data-state="running"]{background:#6a3fc7}
.controls{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.btn{flex:1;min-height:44px;padding:8px 14px;border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;font:inherit;font-size:.95rem;cursor:pointer;touch-action:manipulation}
.btn[aria-pressed="true"]{background:var(--fg);color:#fff;border-color:var(--fg)}
.status{min-height:1.5em;margin:8px 0 0;font-size:.9rem;color:var(--mut)}
.hint{font-size:.85rem;color:var(--mut);margin:6px 0 0}
section.content p,section.content li{margin:6px 0}
details.faq{border-bottom:1px solid var(--line);padding:8px 0}
details.faq summary{cursor:pointer;font-weight:600}
.card{display:block;margin:28px 0;padding:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--fg)}
.card strong{display:block;color:var(--acc)}
footer.site{margin-top:32px;border-top:1px solid var(--line);background:var(--card);padding:16px 0;font-size:.9rem;color:var(--mut)}
footer.site a{margin-right:14px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border:1px solid var(--line);padding:6px 8px;text-align:left}
@media (prefers-reduced-motion:no-preference){.pad{transition:background-color .08s}}