:root{color-scheme:light;--ink:#182233;--muted:#647084;--line:#dfe5ee;--paper:#fff;--bg:#f4f6fb;--blue:#315fe8;--blue-dark:#2146b9;--green:#11734f;--red:#aa303c;--amber:#815b09;font-family:Inter,"Noto Sans KR",system-ui,-apple-system,"Segoe UI",sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.6}.topbar{height:66px;padding:0 max(22px,calc((100vw - 960px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#fff}.brand{font-size:20px;font-weight:850;letter-spacing:-.05em;color:var(--ink);text-decoration:none}.brand span{color:var(--blue)}nav,footer div{display:flex;gap:22px}nav a,footer a{color:var(--muted);text-decoration:none;font-size:14px}nav a:hover,footer a:hover{color:var(--blue)}main{max-width:850px;margin:0 auto;padding:46px 22px 58px}.hero{text-align:center;margin:0 auto 26px;max-width:700px}.eyebrow,.step{margin:0 0 7px;color:var(--blue);font-weight:750;font-size:12px;letter-spacing:.06em}.hero h1{font-size:clamp(27px,5vw,40px);line-height:1.22;letter-spacing:-.045em;margin:0 0 12px}.hero>p:last-child{margin:0;color:var(--muted);font-size:16px}.tool-card,.result-card,.rules-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:0 10px 30px #2435550a}.tool-card{padding:26px}.section-heading,.result-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.section-heading h2,.result-title h2{margin:0;font-size:21px;letter-spacing:-.025em}.step{margin-bottom:2px}textarea{display:block;width:100%;resize:vertical;min-height:190px;border:1px solid #c9d2e1;border-radius:12px;padding:16px;font:15px/1.8 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--ink);background:#fcfdff}textarea:focus,input:focus{outline:3px solid #315fe82a;border-color:var(--blue)}.hint{color:var(--muted);font-size:13px;margin:9px 1px 21px}.hint code{border-radius:4px;background:#edf1f7;padding:1px 4px;color:#344053}.duration-row{display:flex;align-items:center;justify-content:space-between;gap:14px;border-top:1px solid #edf0f5;padding-top:17px;margin-bottom:21px}.duration-row label{font-weight:650;font-size:14px}.duration-row label span{font-weight:450;color:var(--muted)}input{width:190px;border:1px solid #c9d2e1;border-radius:9px;padding:10px 12px;font:inherit;font-size:14px}.actions{display:flex;gap:10px;flex-wrap:wrap}.button{border:0;border-radius:10px;padding:11px 16px;font:inherit;font-weight:700;font-size:14px;cursor:pointer;transition:background .15s,transform .15s}.button:active{transform:translateY(1px)}.button:disabled{opacity:.45;cursor:not-allowed}.button-primary{background:var(--blue);color:#fff}.button-primary:hover{background:var(--blue-dark)}.button-secondary{background:#edf1ff;color:var(--blue-dark)}.button-quiet{background:transparent;color:var(--muted)}.button-quiet:hover{background:#f0f3f8}.result-card{padding:24px;margin-top:18px}.badge{font-size:13px;font-weight:750;border-radius:999px;padding:5px 11px;background:#f1f3f7;color:var(--muted)}.badge.ok{background:#e7f6ef;color:var(--green)}.badge.fail{background:#fff0f0;color:var(--red)}.badge.partial{background:#fff7e4;color:var(--amber)}.result-list{list-style:none;margin:0;padding:0}.result-list li{border-top:1px solid #edf0f5;padding:11px 0;font-size:14px}.result-list li.ok{color:var(--green)}.result-list li.fail{color:var(--red)}.duration-note{margin:12px 0 0;padding:11px 13px;background:#fff8e9;border-radius:9px;color:#765408;font-size:13px}.copy-status{min-height:22px;margin-top:9px;font-size:13px;color:var(--green)}.normalized-detail{margin-top:14px;border-top:1px solid var(--line);padding-top:13px;font-size:14px}.normalized-detail summary{cursor:pointer;font-weight:650}.normalized-detail pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#f7f8fb;padding:13px;border-radius:9px}.rules-card{margin-top:20px;padding:22px 26px}.rules-card h2{font-size:18px;margin:0 0 10px}.rules-card ul{margin:0 0 11px;padding-left:21px}.rules-card p,.rules-card a{font-size:13px;color:var(--muted)}.rules-card a{font-weight:700;color:var(--blue)}footer{display:grid;justify-items:center;gap:10px;margin-top:30px;color:var(--muted);text-align:center}footer p{font-size:13px;margin:0}footer small{font-size:11px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.content-page{max-width:720px;margin:0 auto;background:white;border:1px solid var(--line);border-radius:18px;padding:30px}.content-page h1{line-height:1.25;letter-spacing:-.03em}.content-page h2{font-size:18px;margin-top:28px}.content-page p,.content-page li{color:#435066}.content-page a{color:var(--blue)}
@media(max-width:600px){.topbar{height:58px;padding:0 18px}main{padding:32px 14px 42px}.hero{margin-bottom:20px}.hero>p:last-child{font-size:14px}.tool-card{padding:19px 16px;border-radius:14px}textarea{min-height:170px;font-size:14px}.duration-row{align-items:flex-start;flex-direction:column;gap:8px}.duration-row input{width:100%}.actions{display:grid;grid-template-columns:1fr 1fr}.button-primary{grid-column:1/-1}.result-card{padding:20px 16px}.rules-card{padding:19px 18px}.content-page{padding:23px 18px}nav{gap:15px}}