:root{--bg:#fafaf8;--fg:#1a1a1a;--subtle:#666;--border:#ddd;--accent:#c0392b;--accent-hover:#a93226;--canvas-bg:#f0ede8;--reveal-color:#1a1a1a;--tile-bg:#fff;--tile-border:#ccc;--success-bg:#d4edda;--success-fg:#155724;--failure-bg:#f8d7da;--failure-fg:#721c24;--error-bg:#fff3cd;--error-fg:#856404}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--fg);justify-content:center;align-items:flex-start;min-height:100dvh;font-family:Noto Sans SC,Microsoft YaHei,SimSun,system-ui,sans-serif;display:flex}#app{flex-direction:column;gap:1.25rem;width:100%;max-width:420px;padding:1rem 1rem 2rem;display:flex}header{text-align:center;border-bottom:2px solid var(--accent);padding-bottom:.75rem}#logo{width:auto;height:120px;margin:0 auto 0;display:block}.subtitle{color:var(--subtle);margin-top:-2.5rem;font-size:.85rem}main{flex-direction:column;align-items:center;gap:1rem;display:flex}#canvas-area{background:var(--canvas-bg);border-radius:8px;width:300px;height:300px;overflow:hidden;box-shadow:0 2px 12px #0000001f}#display-canvas{width:300px;height:300px;display:block}#attempts-row{color:var(--subtle);align-self:flex-end;padding-right:.25rem;font-size:.85rem}#attempts{color:var(--fg);font-weight:700}#guess-list{flex-wrap:wrap;justify-content:center;gap:.5rem;width:100%;display:flex}.guess-tile{border:2px solid var(--tile-border);background:var(--tile-bg);border-radius:6px;flex-direction:column;justify-content:center;align-items:center;gap:1px;width:48px;height:56px;font-size:.7rem;display:flex}.guess-tile.empty{opacity:.4}.guess-tile.current{border-color:var(--accent);opacity:.6;color:var(--subtle);font-size:1.1rem}.guess-tile.filled{background:hsl(var(--overlap-hue,0), 60%, 92%);border-color:hsl(var(--overlap-hue,0), 50%, 70%)}.guess-tile.correct{background:#d4edda;border-color:#28a745}.tile-char{font-family:Noto Sans SC,Microsoft YaHei,sans-serif;font-size:1.3rem;line-height:1}.tile-pct{color:var(--subtle);font-size:.6rem}.message{text-align:center;border-radius:6px;width:100%;min-height:1.5rem;padding:.4rem .75rem;font-size:.9rem}.message.success{background:var(--success-bg);color:var(--success-fg);padding:.6rem .75rem}.message.failure{background:var(--failure-bg);color:var(--failure-fg);padding:.6rem .75rem}.message.error{background:var(--error-bg);color:var(--error-fg);padding:.6rem .75rem}#input-area{width:100%}#char-input{text-align:center;border:2px solid var(--border);background:var(--tile-bg);width:100%;color:var(--fg);border-radius:6px;outline:none;padding:.6rem .75rem;font-family:Noto Sans SC,Microsoft YaHei,sans-serif;font-size:1.4rem;transition:border-color .15s}#char-input:focus{border-color:var(--accent)}#char-input:disabled{opacity:.5;cursor:not-allowed}#submit-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:6px;width:100%;padding:.6rem 1.25rem;font-size:.95rem;font-weight:700;transition:background .15s;display:block}#submit-btn:hover:not(:disabled){background:var(--accent-hover)}#submit-btn:disabled{opacity:.5;cursor:not-allowed}#overlap-popover{background:var(--tile-bg);border:1px solid var(--border);pointer-events:none;opacity:0;z-index:100;border-radius:8px;padding:4px;transition:opacity .12s,transform .12s;position:absolute;top:0;left:0;transform:scale(.92);box-shadow:0 4px 16px #0000002e}#overlap-popover.visible{opacity:1;transform:scale(1)}#popover-canvas{border-radius:4px;width:150px;height:150px;display:block}#overlap-popover.diff-legend:after{content:"■ both  ■ target  ■ guess";text-align:center;color:var(--subtle);pointer-events:none;margin-top:3px;font-size:.55rem;display:block}#dev-panel{border:1px dashed #aaa;border-radius:6px;width:100%;font-size:.8rem;overflow:hidden}#dev-panel summary{cursor:pointer;-webkit-user-select:none;user-select:none;background:#f5f5f5;padding:.4rem .75rem}.dev-controls{flex-direction:column;gap:.4rem;padding:.6rem .75rem;display:flex}.dev-row{gap:.4rem;display:flex}#dev-char-input{text-align:center;border:1px solid #ccc;border-radius:4px;width:60px;padding:.3rem .5rem;font-family:Noto Sans SC,sans-serif;font-size:1.1rem}#dev-panel button{cursor:pointer;background:#fff;border:1px solid #aaa;border-radius:4px;padding:.3rem .6rem;font-size:.8rem}#dev-panel button:hover{background:#eee}#dev-target-label{color:#888;font-style:italic}#footer{text-align:center;padding:1rem 1rem 2rem}#footer-kofi{justify-content:center;display:flex}@media (width<=440px){#canvas-area,#display-canvas{width:280px;height:280px}}