:root{--bg:#0d1117;--panel:#161b22;--line:#2a3038;--fg:#e6edf3;--dim:#8b949e;
--ok:#3fb950;--bad:#f85149;--warn:#d29922;--acc:#58a6ff;--mono:ui-monospace,SFMono-Regular,Menlo,monospace}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.wrap{max-width:960px;margin:0 auto;padding:40px 24px 80px}
header{border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:28px;
display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
h1{font-size:22px;margin:0;letter-spacing:-.3px}
h1 span{color:var(--acc)}
nav{margin-left:auto;display:flex;gap:18px}
nav a{color:var(--dim);text-decoration:none;font-size:14px}
nav a:hover,nav a.on{color:var(--fg)}
.lede{color:var(--dim);max-width:70ch}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:20px;margin:20px 0}
.panel h2{font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--dim);margin:0 0 12px}
label{display:block;font-size:13px;color:var(--dim);margin-bottom:6px}
select,input{background:#0d1117;border:1px solid var(--line);color:var(--fg);padding:9px 11px;
border-radius:7px;font:14px var(--mono);width:100%}
select:focus,input:focus{outline:none;border-color:var(--acc)}
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:flex-end}
.row>div{flex:1;min-width:170px}
button{background:var(--acc);color:#04121f;border:0;padding:10px 20px;border-radius:7px;
font-weight:600;font-size:14px;cursor:pointer;white-space:nowrap}
button:hover{filter:brightness(1.1)} button:disabled{opacity:.5;cursor:default}
button.ghost{background:transparent;color:var(--fg);border:1px solid var(--line)}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font:600 11px var(--mono);letter-spacing:.05em}
.CORRECT{background:rgba(63,185,80,.15);color:var(--ok)}
.MISMATCH{background:rgba(248,81,73,.15);color:var(--bad)}
.ENCODING,.SEQUENTIAL,.UNIDENTIFIED,.EMPTY,.ERROR{background:rgba(210,153,34,.15);color:var(--warn)}
table{width:100%;border-collapse:collapse;font:13px var(--mono)}
th{text-align:left;color:var(--dim);font-weight:500;padding:8px 10px;border-bottom:1px solid var(--line);
font-size:11px;text-transform:uppercase;letter-spacing:.06em}
td{padding:9px 10px;border-bottom:1px solid rgba(42,48,56,.5)}
tr:hover td{background:rgba(88,166,255,.04)}
.num{text-align:right}
.dim{color:var(--dim)}
.kv{display:grid;grid-template-columns:170px 1fr;gap:8px 18px;font:13px var(--mono)}
.kv dt{color:var(--dim)} .kv dd{margin:0}
code{font:13px var(--mono);background:#0d1117;padding:2px 6px;border-radius:4px;border:1px solid var(--line)}
.note{color:var(--warn);font-size:13px}
.spin{display:inline-block;width:13px;height:13px;border:2px solid var(--line);
border-top-color:var(--acc);border-radius:50%;animation:s .7s linear infinite;vertical-align:-2px}
@keyframes s{to{transform:rotate(360deg)}}
footer{margin-top:50px;padding-top:20px;border-top:1px solid var(--line);color:var(--dim);font-size:13px}
.lang{display:flex;gap:0;margin-left:14px;border:1px solid var(--line);border-radius:7px;overflow:hidden}
.lang a{padding:4px 11px;font-size:12px;color:var(--dim);text-decoration:none;background:transparent}
.lang a.on{background:var(--acc);color:#04121f;font-weight:600}
.lang a:not(.on):hover{color:var(--fg);background:rgba(88,166,255,.08)}

/* ---------- responsive: usable down to 320px ---------- */

/* Wide content must scroll inside its own box, never the page body. */
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

@media (max-width:760px){
  .wrap{padding:24px 16px 56px}
  header{flex-direction:column;align-items:flex-start;gap:12px}
  nav{margin-left:0;flex-wrap:wrap;align-items:center;gap:14px}
  h1{font-size:20px}
  .kv{grid-template-columns:1fr;gap:2px 0}
  .kv dt{margin-top:10px;font-size:12px;text-transform:uppercase;letter-spacing:.05em}
  .kv dd{margin-bottom:4px}
  .panel{padding:16px;border-radius:9px}
  .row{gap:10px}
  .row>div{flex:1 1 100%;min-width:0}
  .row button{flex:1 1 auto;width:100%}
}

/* Below this a 10-column table cannot be read, so each row becomes a card and every
   cell carries its own label. Data stays complete — nothing is hidden. */
@media (max-width:640px){
  table,tbody,tr,td{display:block;width:100%}
  thead{display:none}
  tr{border:1px solid var(--line);border-radius:9px;padding:10px 12px;margin-bottom:10px;background:rgba(255,255,255,.015)}
  tr:hover td{background:none}
  td{display:flex;justify-content:space-between;align-items:baseline;gap:14px;
     padding:3px 0;border:0;text-align:left}
  td::before{content:attr(data-label);color:var(--dim);font-size:11px;text-transform:uppercase;
     letter-spacing:.05em;flex:0 0 auto}
  td:empty,td[data-label=""]{display:none}
  td.num{text-align:right}
}

@media (max-width:360px){
  .wrap{padding:20px 12px 48px}
  h1{font-size:18px}
  nav{gap:11px;font-size:13px}
  .panel{padding:13px}
  .kv,td,th{font-size:12px}
  .lang a{padding:3px 9px}
}