@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Noto+Sans+KR:wght@400;500;600;700;800&display=swap');
:root {
  color-scheme: dark; --bg:#141414; --panel:#1e1e1e; --input:#121212; --button:#292929;
  --hover:#353535; --line:#484848; --muted:#b9b9b4; --ink:#f1f1ed; --accent:#c4f578;
  --on-accent:#18230c; --bar:#93938f; --error:#ffc49f; --mono:'IBM Plex Mono',monospace;
  --sans:'Noto Sans KR',system-ui,sans-serif; font-family:var(--sans); background:var(--bg);
  color:var(--ink); font-synthesis:none;
}
:root[data-theme="light"] {
  color-scheme:light; --bg:#f5f5f0; --panel:#fff; --input:#f0f0ea; --button:#eaeae3;
  --hover:#ddded5; --line:#bfc2b5; --muted:#55594e; --ink:#20231c; --accent:#38630c;
  --on-accent:#fff; --bar:#717868; --error:#a02c0c;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink)}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer;touch-action:manipulation}
button:disabled{cursor:default;opacity:.5}
a{color:inherit}
button,input,textarea,summary,a,[tabindex]{outline-offset:4px}
:focus-visible{outline:2px solid var(--accent)}
button{min-height:44px}
.topbar{max-width:1180px;margin:auto;padding:18px 28px;display:flex;justify-content:space-between;align-items:center;gap:24px;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:20px;text-decoration:none;display:flex;align-items:center;gap:10px;white-space:nowrap}
.brand-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:5px;background:var(--accent);color:var(--on-accent);font:600 21px var(--mono)}
.top-actions{display:flex;align-items:center;gap:18px}
.segmented{display:flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:9px;background:var(--input)}
.segmented button{flex:1;border:1px solid transparent;background:transparent;border-radius:5px;color:var(--muted);padding:9px 14px;font-size:14px;font-weight:600;white-space:nowrap}
.segmented button:hover:not(:disabled){background:var(--hover);color:var(--ink)}
.segmented button[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.segmented button[aria-pressed="true"]:hover:not(:disabled){background:var(--accent);color:var(--on-accent)}
.compact{gap:3px;padding:3px}
.compact button{font-size:13px;min-height:38px;padding:8px 11px}
.text-button{background:none;border:0;padding:8px 0;color:var(--ink);font-size:14px}
.text-button:hover:not(:disabled){text-decoration:underline}
main{max-width:1180px;margin:auto;padding:24px 28px 0}
.intro{margin-bottom:24px}
.intro h1{font-size:36px;line-height:1.2;letter-spacing:-1px;margin:0 0 10px;font-weight:800}
.intro p{font-size:15px;line-height:1.75;color:var(--muted);margin:0}
.workspace{display:grid;grid-template-columns:260px minmax(0,1fr);gap:32px;align-items:start}
.setup-panel h2{font-size:18px;margin:0 0 14px}
#settings{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 12px}
.mode-switch,.mode-help,.probability-group,.start-group{grid-column:1/-1}
.mode-help{margin:10px 0 20px!important}
#ranking-policy{grid-column:1/-1;margin:0 0 24px;padding:14px 16px;border:1px solid var(--line);border-radius:8px;background:var(--panel);line-height:1.75}
.account-controls{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:0 0 18px;margin-bottom:22px;border-bottom:1px solid var(--line)}
.account-identity{font-size:14px;color:var(--muted);overflow-wrap:anywhere}
.account-control-buttons{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.account-control-buttons .secondary-button{padding:10px 16px;min-height:44px;font-size:14px;font-weight:600}
.account-control-buttons .sign-in-button{border-color:var(--accent);color:var(--accent)}
.account-control-buttons .sign-out-button{border-style:dashed}
.cancel-controls{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:14px 0;padding:12px 0;border-bottom:1px solid var(--line)}
.cancel-controls span{font-size:14px;line-height:1.6;color:var(--muted)}
.cancel-controls button{flex-shrink:0}
.cancel-controls[hidden],.account-control-buttons [hidden]{display:none}
@media(max-width:640px){.account-control-buttons{width:100%;gap:10px}.account-control-buttons button{flex:1 1 auto}.cancel-controls{align-items:flex-start;flex-wrap:wrap}}
.setting-group{margin-bottom:18px;min-width:0}
label{display:flex;justify-content:space-between;font-size:15px;margin-bottom:8px}
.mono{font-family:var(--mono)}
.number-field{display:flex;align-items:center;border:1px solid var(--line);background:var(--panel);border-radius:6px;padding:10px 12px;gap:8px;min-height:49px}
.number-field input{width:100%;min-width:0;border:0;background:none;font:500 22px var(--mono);appearance:textfield}
.number-field input::-webkit-inner-spin-button{appearance:none}
.number-field>span{font-size:14px;color:var(--muted)}
.presets{margin-top:8px}
.presets button{min-height:32px;padding:5px 8px;font-family:var(--mono)}
.field-help{font-size:14px;line-height:1.7;color:var(--muted);margin:8px 0 0}
.calibration-state{font-size:14px;line-height:1.7;min-height:24px;color:var(--muted)}
.error{font-size:14px;line-height:1.6;color:var(--error)}
.error:empty{display:none}
.start-button{width:100%;min-height:49px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px;margin-top:8px;border:1px solid var(--accent);border-radius:6px;background:var(--accent);color:var(--on-accent);font-size:16px;font-weight:700}
.start-button:hover:not(:disabled){filter:brightness(1.08)}
.start-button kbd{border-color:currentColor}
.secondary-button,.copy-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--button);border:1px solid var(--line);border-radius:6px;padding:9px 14px;font-size:14px;white-space:nowrap}
.secondary-button:hover:not(:disabled),.copy-button:hover{background:var(--hover)}
kbd{font:12px var(--mono);border:1px solid var(--line);border-radius:3px;padding:2px 4px}
.game-panel{min-width:0;padding:20px 24px;background:var(--panel);border:1px solid var(--line);border-radius:10px}
.panel-heading{display:flex;justify-content:space-between;gap:12px;font-size:14px;color:var(--muted)}
#model-label{font-family:var(--mono);font-size:13px}
#phase.active{color:var(--accent)}
.readouts{display:flex;justify-content:space-between;align-items:center;margin-top:16px}
.field-label{font-size:14px;color:var(--muted)}
.timer{font:500 54px/1.2 var(--mono);margin-top:4px;letter-spacing:-2px}
.timer>span{font-size:32px;color:var(--muted)}
.timer small{font:14px var(--sans);margin-left:8px;letter-spacing:0;color:var(--muted)}
.timer.urgent{color:var(--error)}
.count-block{text-align:right}
.bit-count{font:500 32px var(--mono);margin-top:10px}
.bit-count>span+span{font-size:19px;color:var(--muted)}
.progress-track{height:3px;background:var(--line);margin:16px 0 18px}
.progress-track>div{height:100%;background:var(--accent);width:0}
.sequence-grid{display:grid;grid-template-columns:repeat(20,minmax(0,1fr));gap:3px 2px;padding:13px 9px;background:var(--input);border:1px solid var(--line);border-radius:5px;max-height:232px;overflow-y:auto;scrollbar-gutter:stable}
.bit-cell{font:15px/20px var(--mono);height:20px;text-align:center;color:var(--muted);border-radius:2px}
.bit-cell.filled{color:var(--ink)}
.bit-cell.next{background:var(--accent);color:var(--on-accent)}
.input-hint{font-size:14px;line-height:1.6;min-height:23px;color:var(--muted);margin:10px 0 14px}
.keypad{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.bit-key{height:82px;display:grid;place-items:center;background:var(--button);border:1px solid var(--line);border-radius:6px;font:500 43px var(--mono)}
.bit-key:hover:not(:disabled){background:var(--hover)}
.bit-key:active:not(:disabled),.bit-key.pressed{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.bit-key:disabled{opacity:1;color:var(--muted)}
.keyboard-help{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px 12px;margin-top:10px;color:var(--muted);font-size:14px}
.keyboard-help .text-button{color:var(--muted)}
.paste-area{border-top:1px solid var(--line);margin-top:16px;padding-top:18px}
.paste-area textarea{display:block;width:100%;min-height:116px;resize:vertical;background:var(--input);border:1px solid var(--line);border-radius:6px;padding:14px 16px;font:16px/1.7 var(--mono);overflow-wrap:anywhere}
textarea::placeholder{color:var(--muted);font-family:var(--sans);font-size:15px}
.paste-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:10px}
.paste-toolbar p{margin:0}
.code-block{position:relative;border:1px solid var(--line);background:var(--input);border-radius:6px;padding:16px}
.code-block code{display:block;font:15px/1.8 var(--mono);overflow-wrap:anywhere;word-break:break-all;padding-right:0}
.copy-button{margin-top:12px}
.copy-button svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7}
body.is-playing .game-panel{border-color:var(--accent)}
footer{border-top:1px solid var(--line);margin-top:28px;padding:18px 0 25px;font-size:13px;color:var(--muted)}
.results,.leaderboard{margin-top:32px;padding-top:28px;border-top:1px solid var(--line);scroll-margin-top:24px}
.result-top{display:grid;grid-template-columns:minmax(0,1fr) 230px;align-items:start;gap:28px}
.result-top h2{font-size:18px;font-weight:500;margin:0 0 8px}
.score{font:500 72px/1.2 var(--mono);color:var(--accent);letter-spacing:-3px}
.score>span{font-size:24px;letter-spacing:-1px;color:var(--muted)}
.result-copy{font-size:16px;line-height:1.8;color:var(--muted);max-width:850px}
.result-copy strong{color:var(--ink)}
.result-meta,.diagnostic-intro{font-size:14px;line-height:1.85;color:var(--muted)}
.observation{font-size:16px;line-height:1.85;border-left:2px solid var(--accent);padding-left:16px;margin:22px 0}
.results h3{font-size:18px;margin:24px 0 8px}
.legend{display:flex;flex-wrap:wrap;gap:16px;font-size:14px;color:var(--muted)}
.legend i{display:inline-block;width:12px;height:12px;background:var(--bar);margin-right:5px}
.legend .observed{width:3px;background:var(--accent)}
.chart-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 32px;margin-top:18px}
.hist-card{min-width:0;border-top:1px solid var(--line);padding-top:16px}
.hist-card h4{font-size:15px;margin:0;font-weight:500}
.hist-card p{font-size:14px;color:var(--muted);margin:8px 0}
.scope-label{font-size:12px;color:var(--muted);margin-left:6px;display:inline-block}
.hist-card svg{display:block;width:100%;height:auto}
.hist-bar{fill:var(--bar)}
.hist-marker{stroke:var(--accent);stroke-width:2}
.hist-point{fill:var(--accent)}
.hist-axis{font:11px var(--mono);fill:var(--muted)}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;text-align:left;font-size:14px;white-space:nowrap;margin-top:16px}
th{font-weight:500;font-size:13px;color:var(--muted)}
th,td{padding:12px 8px;border-bottom:1px solid var(--line)}
td:not(:first-child){font-family:var(--mono)}
.analysis-details{margin-top:24px}
.retry-button{margin-top:0}
.timeout-score{font-size:42px;letter-spacing:-1px}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:20px}
.section-heading h2{margin:0;font-size:22px}
.period-tabs{width:fit-content;max-width:100%}
.ranking-table td:nth-child(3){color:var(--accent);font-weight:600}
dialog{border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink);width:min(820px,calc(100% - 28px));max-height:88vh;padding:0}
dialog::backdrop{background:#000b}
.dialog-header{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 26px;position:sticky;top:0;background:var(--panel);z-index:1;border-bottom:1px solid var(--line)}
.dialog-header h2{font-size:22px;margin:0}
#reference-content{padding:0 26px 24px}
details{border-bottom:1px solid var(--line);padding:18px 0}
summary{cursor:pointer;font-size:16px;font-weight:600;line-height:1.8}
details p,details li{font-size:15px;line-height:1.95;color:var(--muted)}
details ul{padding-left:22px}
details h4{font-size:16px;margin:20px 0 8px}
.formula{font:14px/1.9 var(--mono);background:var(--input);color:var(--ink);padding:14px;border-radius:5px;overflow-wrap:anywhere}
.doc-feature{padding-bottom:12px;border-bottom:1px solid var(--line)}
.doc-feature:last-child{border:0}
.doc-feature p{margin:8px 0}
.warning-note{border-left:2px solid var(--accent);padding-left:14px}
#account{max-width:460px}
.account-form{padding:0 26px 24px}
#recovery-display{padding:26px}
#recovery-display code{overflow-wrap:anywhere}
#recovery-display button{margin:12px 8px 0 0}
#security-form details{margin-top:24px;padding-top:16px;border-top:1px solid var(--line)}
.account-form p{font-size:14px;line-height:1.8;color:var(--muted)}
.account-form label{margin-top:18px}
.account-form input{width:100%;padding:12px;border:1px solid var(--line);border-radius:5px;background:var(--input);font-size:16px}
.account-buttons{display:flex;gap:12px;margin-top:18px}
.account-buttons button{flex:1;width:auto;margin:0}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:90vw;padding:12px 20px;background:var(--ink);color:var(--bg);border-radius:8px;font-size:14px;z-index:10}
[hidden]{display:none!important}
@media(max-width:920px){
  .topbar{align-items:flex-start;gap:16px}.top-actions{flex-wrap:wrap;justify-content:flex-end;gap:12px}
  .workspace{grid-template-columns:230px minmax(0,1fr);gap:24px}
  .game-panel{padding:20px 18px}.bit-cell{font-size:13px}.sequence-grid{column-gap:1px}
}
@media(max-width:680px){
  .topbar{padding:16px 18px;flex-wrap:wrap}.brand{font-size:19px}
  .top-actions{width:100%;justify-content:space-between;gap:12px}.reference-link{width:100%;text-align:left;min-height:30px}
  main{padding:20px 18px 0}.intro{margin-bottom:22px}.intro h1{font-size:30px}
  .workspace{grid-template-columns:minmax(0,1fr);gap:22px}
  .setup-panel h2{font-size:17px;margin-bottom:12px}
  .setup-panel form{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 14px}
  .mode-switch,.mode-help,.start-group{grid-column:1/-1}
  .setting-group{margin-bottom:12px}
  .start-group{margin-top:4px}
  .game-panel{padding:18px 16px}.timer{font-size:48px}.bit-count{font-size:27px}
  .bit-count>span+span{font-size:17px}
  .sequence-grid{grid-template-columns:repeat(10,minmax(0,1fr));gap:2px;padding:12px 8px}
  .bit-cell{font-size:15px;height:18px;line-height:18px}.bit-key{height:88px}
  .paste-toolbar{align-items:flex-start;flex-direction:column}
  .paste-toolbar button{width:100%}.paste-area textarea{min-height:136px}
  .result-top{grid-template-columns:1fr;gap:14px}.result-actions{max-width:300px}
  .score{font-size:60px}.chart-grid{grid-template-columns:1fr}
  .dialog-header{padding:18px}.dialog-header h2{font-size:20px}#reference-content{padding:0 18px 20px}
  .timeout-score{font-size:36px}.scope-label{margin-left:0;margin-right:6px}
  .period-tabs{width:100%}.period-tabs button{padding:9px 5px;font-size:13px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
:root .challenge-banner { padding: 16px 20px; border-left: 4px solid var(--accent); background: var(--panel); font-size: 16px; }
.share-result { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, .8fr); gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--border, #666); margin-bottom: 24px; }
.share-result img { width: 100%; height: auto; border-radius: 10px; background: #141414; }
.share-controls { display: flex; flex-direction: column; align-items: stretch; justify-content: center; gap: 12px; min-width: 0; }
.share-controls input { width: 100%; min-width: 0; box-sizing: border-box; font-size: 14px; padding: 12px; }
.share-controls p { margin: 0; font-size: 14px; }
@media (max-width: 640px) { .share-result { grid-template-columns: minmax(0, 1fr); gap: 16px; } }