:root{--bg: #1c1f24;--surface: #262a31;--surface-2: #2e333b;--board: #20242a;--cell: #353b45;--cell-rim: #3f4651;--ink: #e6e8ec;--ink-soft: #a8adb6;--ink-faint: #6e7480;--line: #3a3f48;--line-soft: #2f343c;--accent: #4a90e2;--accent-strong: #5fa8f5;--accent-deep: #2f6dbf;--accent-soft: #7fb6ee;--piece-color: #0d6efd}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,sans-serif;font-size:19px;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer}:focus:not(:focus-visible){outline:none}#app{display:flex;flex-direction:column;height:100%;min-height:0}.app-header{display:flex;align-items:center;justify-content:space-between;padding:15px 25px;background:var(--surface);border-bottom:1px solid var(--line-soft);flex-shrink:0;-webkit-user-select:none;user-select:none}.app-header .title{font-size:20px;font-weight:600;letter-spacing:-.01em;color:var(--ink)}.gear-btn{width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:var(--surface-2);color:var(--ink-soft);display:grid;place-items:center;transition:background .12s,color .12s}.gear-btn:hover{background:var(--cell);color:var(--ink)}.game-area{flex:1;position:relative;overflow:hidden;background:var(--bg);min-height:0}.today-pill{position:absolute;top:18px;left:18px;z-index:5;display:inline-flex;align-items:center;gap:10px;padding:6px 15px;background:var(--surface-2);border:1px solid var(--line);border-radius:8px;font-size:16px;color:var(--ink);-webkit-user-select:none;user-select:none}.today-pill .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);flex-shrink:0}.hint-btn{position:absolute;top:18px;right:18px;z-index:5;width:40px;height:40px;border:1px solid var(--line);border-radius:50%;background:var(--surface-2);color:var(--ink-soft);display:grid;place-items:center;transition:background .12s,color .12s,opacity .12s;cursor:pointer;-webkit-user-select:none;user-select:none}.hint-btn:hover:not(:disabled){background:var(--cell);color:var(--ink)}.hint-btn:disabled{opacity:.35;cursor:default}.hint-badge{position:absolute;top:-4px;right:-4px;width:16px;height:16px;border-radius:50%;background:var(--accent);color:#fff;font-size:10px;font-weight:700;font-family:JetBrains Mono,monospace;display:grid;place-items:center;pointer-events:none}.hint-btn:disabled .hint-badge{display:none}.check-btn{position:absolute;bottom:18px;right:18px;z-index:5;width:40px;height:40px;border:1px solid var(--line);border-radius:50%;background:var(--surface-2);color:var(--ink-soft);display:grid;place-items:center;transition:background .12s,color .12s;cursor:pointer;-webkit-user-select:none;user-select:none}.check-btn:hover:not(:disabled){background:var(--cell);color:var(--ink)}.check-btn:disabled{opacity:.35;cursor:default}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(6px)}to{opacity:1;transform:translate(-50%) translateY(0)}}@keyframes toast-out{0%{opacity:1}to{opacity:0}}.check-toast{position:absolute;bottom:72px;left:50%;transform:translate(-50%);z-index:10001;padding:8px 20px;border-radius:8px;font-size:14px;font-weight:600;white-space:nowrap;pointer-events:none;animation:toast-in .18s ease-out}.check-toast.solvable{background:#1a5c2a;border:1px solid #2d9148;color:#fff}.check-toast.unsolvable{background:#6b1f1f;border:1px solid #a83030;color:#fff}.check-toast.fade-out{animation:toast-out .4s ease-out forwards}.grid-wrapper{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;pointer-events:none}.puz-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:1px;padding:8px;width:clamp(350px,45vw,525px);background:var(--board);border:1px solid var(--line);border-radius:8px;pointer-events:all}.puz-cell{aspect-ratio:1;background:var(--cell);display:grid;place-items:center;font-family:JetBrains Mono,monospace;font-size:14px;font-weight:500;color:var(--ink-soft);-webkit-user-select:none;user-select:none;text-transform:uppercase}.puz-cell.disabled{background:transparent;pointer-events:none}.puz-cell.today{background:var(--accent);color:#fff;box-shadow:0 0 0 1.5px var(--accent-strong) inset;font-weight:700}.piece{display:grid;grid-auto-rows:1fr;grid-template-columns:repeat(var(--cols, 3),1fr);gap:0;position:absolute;touch-action:none;-webkit-user-select:none;user-select:none;pointer-events:none}.piece:not(.dragging){cursor:grab}.piece.dragging{cursor:grabbing;z-index:100}@keyframes anim-rotate{0%{transform:rotate(-90deg)}to{transform:rotate(0)}}@keyframes anim-rotate-ccw{0%{transform:rotate(90deg)}to{transform:rotate(0)}}@keyframes anim-flip{0%{transform:scaleX(-1)}to{transform:scaleX(1)}}.piece.anim-rotate{animation:anim-rotate .15s ease-out}.piece.anim-rotate-ccw{animation:anim-rotate-ccw .15s ease-out}.piece.anim-flip{animation:anim-flip .15s ease-out}.piece .pc{background:var(--piece-color);border-radius:0;pointer-events:all}.piece .pc.empty{background:transparent;pointer-events:none}.puz-cell.preview-valid{background:#4a90e259;outline:1.5px solid rgba(95,168,245,.7);outline-offset:-1.5px}.puz-cell.preview-invalid{background:#c8463c59;outline:1.5px solid rgba(220,90,80,.6);outline-offset:-1.5px}.app-footer{display:flex;gap:15px;padding:13px 25px 15px;justify-content:center;background:var(--surface);border-top:1px solid var(--line-soft);flex-shrink:0}.footer-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:7px;padding:11px 8px;background:var(--surface-2);border:1px solid var(--line);border-radius:8px;font-size:14px;font-weight:500;color:var(--ink);transition:background .12s;max-width:160px}.footer-btn:hover{background:var(--cell)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:100;display:none;align-items:center;justify-content:center}.modal-overlay.open{display:flex}.modal{background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:25px 28px;box-shadow:0 16px 40px #00000073;width:400px;max-width:90vw}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px;padding-bottom:15px;border-bottom:1px solid var(--line)}.modal-header h5{font-size:18px;font-weight:600;color:var(--ink)}.modal-close-btn{width:32px;height:32px;border:1px solid var(--line);border-radius:8px;background:var(--surface-2);color:var(--ink-soft);font-size:16px;display:grid;place-items:center;transition:background .12s,color .12s}.modal-close-btn:hover{background:var(--cell);color:var(--ink)}.guide-section{padding:14px 0;border-bottom:1px solid var(--line-soft)}.guide-section:last-child{border-bottom:none;padding-bottom:0}.guide-label{font-size:14px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);margin-bottom:7px}.guide-text{font-size:14px;color:var(--ink-soft);line-height:1.55;margin:0}.shortcut-row{display:flex;align-items:center;gap:6px;padding:4px 0;font-size:14px;color:var(--ink-soft)}.shortcut-row kbd{font-family:JetBrains Mono,monospace;font-size:12px;background:var(--surface-2);border:1px solid var(--line);border-radius:5px;padding:2px 8px;color:var(--ink);white-space:nowrap;text-align:center;flex-shrink:0}.win-badge{position:absolute;top:18px;left:50%;transform:translate(-50%) translateY(-6px);opacity:0;transition:opacity .3s ease-out,transform .3s ease-out;z-index:10000;pointer-events:none;background:var(--accent);color:#fff;padding:7px 20px;border-radius:8px;border:1px solid var(--accent-strong);font-size:15px;font-weight:600;letter-spacing:-.01em;white-space:nowrap;box-shadow:0 4px 16px #4a90e266}.win-badge.visible{opacity:1;transform:translate(-50%) translateY(0)}@keyframes shimmer-sweep{0%{transform:translate(-100%)}to{transform:translate(100%)}}.shimmer-sweep{position:absolute;top:-50%;right:-50%;bottom:-50%;left:-50%;background:linear-gradient(135deg,transparent 40%,rgba(255,255,255,.16) 50%,transparent 60%);pointer-events:none;animation:shimmer-sweep 1.4s ease-in-out forwards}.today-pill{cursor:pointer}.today-pill:hover{background:var(--cell)}.date-picker{position:fixed;z-index:200;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px;box-shadow:0 12px 32px #00000080;width:260px;display:none}.date-picker.open{display:block}.dp-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.dp-nav{width:28px;height:28px;border:1px solid var(--line);border-radius:6px;background:var(--surface-2);color:var(--ink-soft);font-size:14px;display:grid;place-items:center;cursor:pointer;transition:background .1s,color .1s}.dp-nav:hover{background:var(--cell);color:var(--ink)}.dp-month-label{font-size:14px;font-weight:600;color:var(--ink);letter-spacing:-.01em}.dp-weekdays{display:grid;grid-template-columns:repeat(7,1fr);margin-bottom:4px}.dp-weekday{text-align:center;font-family:JetBrains Mono,monospace;font-size:10px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.06em;padding:4px 0}.dp-days{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}.dp-day{aspect-ratio:1;display:grid;place-items:center;font-size:12px;font-family:JetBrains Mono,monospace;color:var(--ink-soft);border-radius:5px;cursor:pointer;border:1px solid transparent;transition:background .1s,color .1s}.dp-day:hover{background:var(--cell);color:var(--ink)}.dp-day.other-month{color:var(--ink-faint)}.dp-day.is-today{border-color:var(--accent);color:var(--accent)}.dp-day.selected{background:var(--accent);color:#fff;border-color:transparent}.dp-day.selected:hover{background:var(--accent-strong)}.dp-footer{margin-top:10px;display:flex;justify-content:center}.dp-today-btn{font-size:12px;font-weight:500;color:var(--accent);background:none;border:1px solid var(--accent);border-radius:6px;padding:5px 14px;cursor:pointer;transition:background .1s,color .1s}.dp-today-btn:hover{background:var(--accent);color:#fff}.mono{font-family:JetBrains Mono,monospace}@media(max-width:768px){.grid-wrapper{align-items:flex-start;padding-top:68px}.puz-grid{width:clamp(280px,88vw,420px)}}@media(max-width:430px){.footer-btn span{display:none}.footer-btn{padding:13px;gap:0}}