:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;color:#191919;background:#fff;color-scheme:light}*{box-sizing:border-box}body{margin:0;line-height:1.6}main{max-width:460px;margin:auto;padding:20px 20px max(28px,env(safe-area-inset-bottom))}button,a,summary{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;border:1px solid #ddd;border-radius:10px;min-height:48px;background:#f4f4f4;cursor:pointer}button:disabled{color:#9a9a9a;background:#f5f5f5;border-color:#eee;cursor:default}button:active:not(:disabled){background:#ddd}button:focus-visible,a:focus-visible{outline:3px solid #777;outline-offset:3px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}header a{text-decoration:none;color:#191919;font-size:16px;font-weight:800;letter-spacing:2px}header a span{display:block;font-size:12px;color:#777;font-weight:400;letter-spacing:1px;margin-top:2px}.help{border-radius:50%;min-height:44px;width:44px;background:#fff;font-size:18px}nav{display:flex;border-bottom:1px solid #ddd;gap:20px}nav button{border:0;border-bottom:2px solid transparent;border-radius:0;background:white;flex:1;font-size:15px;color:#777}nav button[aria-pressed=true]{border-bottom-color:#191919;color:#191919;font-weight:700}.intro{margin:22px 0}.subtitle{font-size:12px;letter-spacing:3px;color:#666}h1{font-size:27px;line-height:1.4;margin:4px 0 8px;letter-spacing:-.6px}.intro p{font-size:14px;color:#666;margin:0}.statusline{display:flex;justify-content:space-between;gap:10px;font-size:14px;margin-bottom:12px}.statusline>span{color:#666}.number-box{border:1px solid #d6d6d6;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;height:142px;background:#fafafa;overflow:hidden}.x-label{font-size:12px;letter-spacing:2px;color:#777}#number{font:60px ui-monospace,monospace;line-height:1.15;min-height:69px;letter-spacing:2px}#input-guide{font-size:12px;color:#777}#message{min-height:24px;font-size:14px;margin:12px 0;color:#555}.keyboard{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.key{height:52px;font-size:24px;position:relative;font-variant-numeric:tabular-nums}.key.edit{font-size:14px;background:#fff}.primary{width:100%;min-height:52px;margin-top:10px;font-weight:700;background:#1a1a1a;color:#fff;border-color:#1a1a1a}.primary:active:not(:disabled){background:#444}.history-section{margin-top:27px}.history-title{display:flex;justify-content:space-between;align-items:center;gap:10px}h2{font-size:16px;margin:0}.history-title span{font-size:12px;color:#777}#history{list-style:none;padding:0;margin:12px 0 0}#history li{display:grid;grid-template-columns:30px 65px 1fr;gap:10px;align-items:center;padding:12px 10px;border-top:1px solid #e6e6e6;font-size:14px}#history li:first-child{background:#f4f4f4;border-radius:8px}#history .seq{font:12px monospace;color:#777}#history .value{font:25px ui-monospace,monospace}.direction{text-align:right}#empty{font-size:14px;text-align:center;color:#777;margin:24px 0}.restart{display:block;margin:25px auto 0;padding:9px 20px;background:white;font-size:14px;color:#666}footer{margin-top:23px;text-align:center;font-size:12px;color:#777}#result{margin-top:18px}#result-title{font-size:25px}#result-text{font-size:15px;color:#555}.clue-guide{font-size:14px}#clues{padding:0;list-style:none;margin:0 0 20px;counter-reset:clue}#clues li{counter-increment:clue;display:flex;align-items:center;gap:12px;border-bottom:1px solid #e5e5e5;padding:10px 0;font-size:15px}#clues li:before{content:counter(clue,upper-alpha);font:12px monospace;background:#f0f0f0;min-width:28px;height:28px;display:grid;place-items:center;border-radius:6px}#explanation{font-size:14px;border-left:2px solid #333;padding-left:12px}#explanation p{margin:8px 0}dialog{max-width:410px;width:calc(100% - 32px);border:1px solid #ddd;border-radius:14px;padding:24px;background:#fff;color:#191919;max-height:85dvh}dialog::backdrop{background:#0006}dialog h2{font-size:21px}dialog p{font-size:15px;color:#555}#dialog-actions{display:flex;gap:10px;margin-top:20px}#dialog-actions button{flex:1;margin:0}.fx-overlay{position:fixed;inset:0;display:grid;place-items:center;pointer-events:none;z-index:30;padding:24px}.fx-card{display:flex;flex-direction:column;align-items:center;text-align:center;background:#171717;color:white;box-shadow:0 15px 65px #0003;border-radius:18px;padding:28px 30px;min-width:230px;max-width:100%}.fx-card strong{font-size:55px;line-height:1.2}.fx-card span{font-size:23px;margin-top:8px}.fx-card small{font-size:14px;color:#ddd;margin-top:6px}.fly{position:fixed;top:0;left:0;font:32px ui-monospace,monospace;display:flex;width:0;height:0;align-items:center;justify-content:center;pointer-events:none;z-index:25}[hidden]{display:none!important}@media(max-width:350px){main{padding:15px 14px}h1{font-size:24px}.history-title{align-items:flex-start;flex-direction:column;gap:3px}}@media(max-height:750px){header{margin-bottom:12px}.intro{margin:16px 0}.number-box{height:112px}#number{font-size:48px;min-height:55px}.key{height:48px}main{padding-top:14px}}

.home-nav{max-width:460px;margin:0 auto;padding:12px 18px 0}.home-nav a{display:inline-flex;align-items:center;min-height:44px;color:#555;font-size:14px;text-decoration:none;touch-action:manipulation}