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var(--color-panel) 94%, transparent)}}.tabbar{border-top:1px solid var(--color-line);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.tab,.nav-btn{min-height:48px;color:var(--color-faint);letter-spacing:.01em;background:0 0;border:0;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:2px;font-size:.68rem;font-weight:600;display:flex}.tab{padding:0 1px;font-size:.6rem;line-height:1.15}.tab.active,.nav-btn.active{color:var(--color-ink);background:var(--color-subtle)}.layout{gap:16px;display:grid}.panel{background:var(--color-panel);border:1px solid var(--color-line);border-radius:28px;padding:16px}.panel h2,.section-title{font-family:var(--font-display);letter-spacing:-.02em;margin:0;font-size:1.35rem;font-weight:560;line-height:1.15}.muted{color:var(--color-muted)}.faint{color:var(--color-faint)}.btn{min-height:44px;color:var(--color-ink);pointer-events:auto;background:0 0;border:1px solid #0000;border-radius:8px;padding:0 14px;font-size:.95rem;font-weight:650;transition:transform .15s cubic-bezier(.22,1,.36,1),background .15s cubic-bezier(.22,1,.36,1),opacity .15s linear;position:relative}.btn:active:not(:disabled){transform:scale(.98)}.btn.solid{background:var(--color-paper);color:var(--color-ink-strong)}.btn.ghost{border-color:var(--color-line);background:var(--color-subtle)}.btn.warn{color:#f0d2cc;border-color:#793e32}@supports (color:color-mix(in lab, red, red)){.btn.warn{border-color:color-mix(in srgb, var(--color-danger) 50%, var(--color-line))}}.btn:disabled{opacity:.42}.btn-row{flex-wrap:wrap;gap:8px;display:flex}.choice{border:1px solid var(--color-line);background:var(--color-subtle);min-height:44px;color:var(--color-ink);border-radius:12px;padding:8px 12px;font-weight:600}.choice.on{background:var(--color-paper);color:var(--color-ink-strong);border-color:#0000}.seg{background:var(--color-canvas);border:1px solid var(--color-line);border-radius:16px;flex-wrap:wrap;gap:4px;padding:4px;display:flex}.seg button{min-height:40px;color:var(--color-muted);background:0 0;border:0;border-radius:12px;flex:40%;padding:0 6px;font-size:.78rem;font-weight:650}.seg button.on{background:var(--color-paper);color:var(--color-ink-strong)}.board-wrap{width:min(100%,640px);margin:0 auto}.board-frame{background:var(--sq-frame);border-radius:18px;padding:10px;position:relative;box-shadow:0 18px 40px #00000047}.move-arrow{z-index:4;pointer-events:none;width:100%;height:100%;position:absolute;inset:0;overflow:visible}.move-arrow line{stroke:#2f9e62;stroke-width:.22px;stroke-linecap:round}.move-arrow polygon{fill:#2f9e62}.board{aspect-ratio:1;touch-action:none;-webkit-user-select:none;user-select:none;border-radius:8px;grid-template-rows:repeat(8,1fr);grid-template-columns:repeat(8,1fr);width:100%;display:grid;position:relative;overflow:hidden}.sq{background:var(--sq-light);color:inherit;border:0;place-items:center;padding:0;display:grid;position:relative}.sq.dark{background:var(--sq-dark)}.sq.last.light{background:var(--sq-last-l)}.sq.last.dark{background:var(--sq-last-d)}.sq.sel{box-shadow:inset 0 0 0 3px var(--sq-sel)}.sq.check{background:var(--sq-check)!important}.coord{opacity:.72;pointer-events:none;font-size:clamp(8px,1.7vw,11px);font-weight:700;line-height:1;position:absolute}.coord.file{bottom:2px;right:3px}.coord.rank{top:2px;left:3px}.piece{object-fit:contain;pointer-events:none;filter:drop-shadow(0 1px 1px #00000059);z-index:1;width:92%;height:92%;position:relative}.piece.modern{width:86%;height:86%}.piece.solid3d{filter:drop-shadow(0 4px 2px #0006);width:104%;height:104%}.piece.fall{transform-origin:50% 80%;animation:.82s cubic-bezier(.22,1,.36,1) forwards piece-fall}@keyframes piece-fall{0%{opacity:1;transform:translateY(0)rotate(0)}30%{transform:translateY(-12%)rotate(-8deg)}to{opacity:.12;transform:translateY(26%)rotate(16deg)}}.sq.mated-king{animation:.68s ease-in-out 3 king-hit}@keyframes king-hit{0%,to{box-shadow:inset 0 0 #0000}50%{box-shadow:inset 0 0 0 4px #b03a2eeb}}.board-wrap.mated .board-frame{animation:.9s ease-out mate-flash}@keyframes mate-flash{0%{box-shadow:0 18px 40px #00000047}35%{box-shadow:0 0 0 6px #e8c4788c,0 18px 40px #00000047}to{box-shadow:0 18px 40px #00000047}}.piece.aoe{width:100%;height:100%}.plate{z-index:0;border-radius:999px;width:78%;height:78%;position:absolute}.plate.w{background:#f7f4ee;box-shadow:inset 0 0 0 1px #0000001f}.plate.b{background:#2a2723;box-shadow:inset 0 0 0 1px #ffffff14}.dot,.ring{z-index:2;pointer-events:none;border-radius:999px;position:absolute}.dot{background:#00000047;width:18%;height:18%}.sq.dark .dot{background:#ffffff61}.ring{width:86%;height:86%;box-shadow:inset 0 0 0 4px #00000047}.sq.dark .ring{box-shadow:inset 0 0 0 4px #fff6}.hint{box-shadow:inset 0 0 0 3px var(--color-ok)}.drag-piece{z-index:50;pointer-events:none;filter:drop-shadow(0 8px 10px #00000059);width:64px;height:64px;margin-top:-32px;margin-left:-32px;position:fixed}.drag-piece img{object-fit:contain;width:100%;height:100%}.promo{z-index:5;background:var(--color-panel);border:1px solid var(--color-line);border-radius:16px;gap:6px;padding:6px;display:flex;position:absolute;box-shadow:0 10px 30px #00000059}.promo button{background:var(--color-subtle);border:0;border-radius:12px;width:52px;height:52px;padding:4px}.promo img{object-fit:contain;width:100%;height:100%}.board-frame[data-theme=brown]{--sq-light:#f0d9b5;--sq-dark:#b58863;--sq-last-l:#e6e08a;--sq-last-d:#c7b458;--sq-sel:#f3e36a;--sq-check:#e07068;--sq-frame:#6a4630}.board-frame[data-theme=blue]{--sq-light:#dee6ee;--sq-dark:#7f97ad;--sq-last-l:#d5e09a;--sq-last-d:#8ea36a;--sq-sel:#f0e28a;--sq-check:#d46a62;--sq-frame:#3d5164}.board-frame[data-theme=green]{--sq-light:#ffd;--sq-dark:#6d8f4e;--sq-last-l:#e7e58a;--sq-last-d:#b7c45a;--sq-sel:#f6ef86;--sq-check:#d86a62;--sq-frame:#3e5230}.board-frame[data-theme=walnut]{--sq-light:#c4a27a;--sq-dark:#6b4630;--sq-last-l:#d2c27a;--sq-last-d:#8d7040;--sq-sel:#efe08a;--sq-check:#c85a52;--sq-frame:#3a2618}.board-frame[data-theme=marble]{--sq-light:#f3f0ea;--sq-dark:#9a97a3;--sq-last-l:#e4e6a4;--sq-last-d:#b7b48a;--sq-sel:#f4e9a0;--sq-check:#d87870;--sq-frame:#5c5a62}.board-frame[data-theme=slate]{--sq-light:#c9d0d8;--sq-dark:#5e6b7a;--sq-last-l:#d5dba0;--sq-last-d:#7f9168;--sq-sel:#efe6a4;--sq-check:#d07068;--sq-frame:#2e3640}.board-frame[data-theme=oak]{--sq-light:#e7c99a;--sq-dark:#b07d45;--sq-last-l:#e4d98a;--sq-last-d:#c4a15a;--sq-sel:#f3e38a;--sq-check:#d07068;--sq-frame:#6a4524}.board-frame[data-theme=ice]{--sq-light:#eef5fb;--sq-dark:#8eb4d4;--sq-last-l:#e4e9a4;--sq-last-d:#a3c07a;--sq-sel:#f4e9a0;--sq-check:#d87870;--sq-frame:#3d5d78}.board-frame[data-theme=sand]{--sq-light:#f6ead0;--sq-dark:#c4a36a;--sq-last-l:#e7e08a;--sq-last-d:#c9b15a;--sq-sel:#f6ef86;--sq-check:#d86a62;--sq-frame:#7a5a32}.board-frame[data-theme=grape]{--sq-light:#efe6f6;--sq-dark:#7d6a9a;--sq-last-l:#e4e6a4;--sq-last-d:#b7a8c4;--sq-sel:#f4e9a0;--sq-check:#d87870;--sq-frame:#46385c}.board-frame[data-theme=stone]{--sq-light:#e4e0da;--sq-dark:#8d8882;--sq-last-l:#e0e4a0;--sq-last-d:#a8ae78;--sq-sel:#efe6a4;--sq-check:#d07068;--sq-frame:#4a4744}.app[data-bg=cosmos]{--color-canvas:#071422;background-color:#071422;background-image:radial-gradient(1px 1px at 12% 18%,#fff 50%,#0000 52%),radial-gradient(1.2px 1.2px at 28% 72%,#d6e4ff 50%,#0000 52%),radial-gradient(1px 1px at 70% 24%,#fff 50%,#0000 52%),radial-gradient(1.5px 1.5px at 84% 64%,#c9d8ff 50%,#0000 52%),radial-gradient(1px 1px at 46% 42%,#fff 50%,#0000 52%),radial-gradient(1px 1px at 58% 86%,#fff 50%,#0000 52%),radial-gradient(1px 1px at 8% 88%,#fff 50%,#0000 52%),radial-gradient(at 50% 120%,#16345c,#0000 58%);background-size:280px 320px}.app[data-bg=night]{--color-canvas:#07080c;background:#07080c}.app[data-bg=forest]{--color-canvas:#101910;background:#101910}.app[data-bg=ocean]{--color-canvas:#0c2430;background:radial-gradient(at 50% 0,#16485c,#0c2430 60%)}.app[data-bg=dusk]{--color-canvas:#1a1024;background:radial-gradient(at 50% 0,#3a2458,#1a1024 62%)}.app[data-bg=ember]{--color-canvas:#1c100c;background:radial-gradient(at 50% 100%,#4a2418,#1c100c 58%)}.app[data-bg=paper]{--color-canvas:#f4efe6;--color-panel:#fffaf3;--color-subtle:#efe8dc;--color-ink:#1c1914;--color-ink-strong:#141412;--color-muted:#5e584e;--color-faint:#8a8174;--color-line:#e2d8c8;background:#f4efe6}.theme-tabs{gap:4px;margin:12px 0;display:flex;overflow-x:auto}.theme-tabs button{min-height:40px;color:var(--color-muted);background:0 0;border:0;border-bottom:2px solid #0000;flex:1 0 auto;padding:0 8px;font-weight:700}.theme-tabs button.on{color:var(--color-ink);border-bottom-color:var(--color-ink)}.theme-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;display:grid}.theme-cell{aspect-ratio:1;background:var(--color-subtle);border:2px solid #0000;border-radius:12px;padding:0;overflow:hidden}.theme-cell.on{border-color:#7d9a4a}.mini-board{grid-template-columns:1fr 1fr;width:100%;height:100%;display:grid}.mini-board i{display:block}.piece-cell{background:#1a1c20;place-items:center;display:grid}.piece-cell img{object-fit:contain;width:72%;height:72%}.bg-tile{width:100%;height:100%;display:block}.bg-tile.ink{background:#0e0e0c}.bg-tile.night{background:#07080c}.bg-tile.forest{background:#101910}.bg-tile.ocean{background:radial-gradient(at 50% 0,#16485c,#0c2430 70%)}.bg-tile.dusk{background:radial-gradient(at 50% 0,#3a2458,#1a1024 70%)}.bg-tile.ember{background:radial-gradient(at 50% 100%,#4a2418,#1c100c 70%)}.bg-tile.paper{background:#f4efe6}.bg-tile.cosmos{background-color:#071422;background-image:radial-gradient(1px 1px at 20% 30%,#fff 50%,#0000 52%),radial-gradient(1.2px 1.2px at 70% 60%,#d6e4ff 50%,#0000 52%),radial-gradient(1px 1px at 40% 80%,#fff 50%,#0000 52%)}.sound-row{border:0;border-bottom:1px solid var(--color-line);width:100%;min-height:52px;color:var(--color-ink);text-align:left;background:0 0;align-items:center;gap:10px;padding:0 4px;font-weight:650;display:flex}.sound-row .mark{color:#7d9a4a;width:1.2rem}.sound-row>.sound-row{border:0;flex:1;width:auto}.play-pip{border:1px solid var(--color-line);background:var(--color-subtle);width:36px;height:36px;color:var(--color-ink);border-radius:10px;margin-left:auto}.status-line{min-height:1.5rem;font-weight:650}.status-line.check{color:var(--color-danger)}.moves{font-variant-numeric:tabular-nums;grid-template-columns:28px 1fr 1fr;gap:2px 8px;max-height:220px;font-size:.92rem;display:grid;overflow:auto}.moves .n{color:var(--color-faint)}.cap-row{justify-content:space-between;align-items:center;gap:8px;width:min(100%,640px);min-height:28px;margin:0 auto;display:flex}.captures{flex-wrap:wrap;align-items:center;min-height:22px;display:flex}.captures.on-light{background:#f4efe4;border-radius:999px;min-height:26px;padding:2px 8px 2px 5px}.captures img{object-fit:contain;width:16px;height:22px;margin-right:-2px}.captures.on-light img{filter:drop-shadow(0 1px #3c28142e)}.code-chip{font-family:var(--font-display);letter-spacing:.22em;text-align:center;margin:0;font-size:2rem;font-weight:560}.cap-plus{color:var(--color-muted);margin-left:6px;font-size:.78rem;font-weight:700}.clock{font-variant-numeric:tabular-nums;text-align:center;background:var(--color-subtle);min-width:62px;color:var(--color-ink);border-radius:8px;padding:3px 8px;font-weight:700}.clock.on{background:var(--color-paper);color:var(--color-ink-strong)}.clock.low{color:#b03a2e}.play-stack{gap:6px;width:100%;display:grid}.board-slot{min-width:0;min-height:0;position:relative}.board-slot.launch:before{content:"";z-index:5;background:#00000047;border-radius:18px;position:absolute;inset:0}.play-launch{z-index:6;background:var(--color-ink);min-width:148px;min-height:58px;color:var(--color-canvas);font-family:var(--font-display);letter-spacing:-.03em;white-space:nowrap;border:0;border-radius:999px;padding:0 32px;font-size:1.45rem;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 14px 32px #00000059}.play-setup{text-align:left;width:min(100% - 12px,360px);max-height:94%;padding:12px;overflow:auto}.play-setup h2{font-size:1.2rem}.play-setup-head{justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px;display:flex}.play-setup .choice{flex:auto;min-height:36px;padding:4px 8px;font-size:.82rem}.play-setup .btn{min-height:40px}.play-modes h2{margin-bottom:12px;font-size:1.35rem}.play-mode-list{gap:8px;display:grid}.board-slot.ended:before{content:"";z-index:5;background:#00000059;border-radius:18px;position:absolute;inset:0}.result-sign{z-index:6;text-align:center;background:var(--color-panel);border:1px solid var(--color-line);border-radius:18px;width:min(280px,88%);padding:18px 16px 16px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 18px 40px #0006}.result-sign h2{font-family:var(--font-display);letter-spacing:-.03em;margin:0;font-size:1.8rem;font-weight:560}.result-sign.win h2{color:var(--color-ok)}.result-sign.loss h2{color:var(--color-danger)}.result-sign p{margin:8px 0 0}.save-row{justify-content:space-between;align-items:center;gap:8px;display:flex}.score-line{-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:8px 0 0;font-size:.82rem;line-height:1.35;display:-webkit-box;overflow:hidden}.slider{width:100%;accent-color:var(--color-paper);height:28px}.tier-range{background:var(--color-subtle);border-radius:999px;height:6px;margin-top:10px;overflow:hidden}.tier-range span{background:var(--color-ok);height:100%;display:block}.swatch{border:1px solid var(--color-line);border-radius:12px;grid-template-columns:1fr 1fr;width:44px;height:44px;padding:0;display:grid;overflow:hidden}.swatch.on{outline:2px solid var(--color-paper);outline-offset:2px}.style-pick{grid-template-columns:1fr 1fr;gap:8px;display:grid}.style-pick button{text-align:left;align-items:center;gap:8px;min-height:64px;display:flex}.style-pick img{object-fit:contain;width:42px;height:42px}.lesson-list,.tactic-list{flex-direction:column;gap:8px;display:flex}.puzzle-scroll{-webkit-overflow-scrolling:touch;max-height:calc(100dvh - 340px);padding-bottom:8px;overflow-y:auto}.pz-stars{letter-spacing:1px;color:#e2c15a;font-weight:700}.pz-stars i{color:var(--color-faint);font-style:normal}.pz-cover-wrap{position:relative}.pz-cover-wrap.covered .board-wrap{filter:blur(14px);pointer-events:none;-webkit-user-select:none;user-select:none}.pz-cover{z-index:6;text-align:center;background:var(--color-panel);border:1px solid var(--color-line);border-radius:18px;flex-direction:column;justify-content:center;align-items:center;gap:10px;padding:22px 18px;display:flex;position:absolute;inset:0}.pz-cover h2{font-family:var(--font-display);letter-spacing:-.02em;margin:0;font-weight:560}.pz-cover p{max-width:28rem;margin:0}.row-btn:disabled{opacity:.45}.row-btn{text-align:left;background:var(--color-subtle);width:100%;color:var(--color-ink);border:1px solid var(--color-line);border-radius:16px;justify-content:space-between;align-items:center;gap:12px;min-height:56px;padding:12px;display:flex}.row-btn small{color:var(--color-muted);font-weight:500;display:block}.chips{flex-wrap:wrap;gap:6px;display:flex}.chips button{border:1px solid var(--color-line);min-height:36px;color:var(--color-muted);background:0 0;border-radius:999px;padding:0 10px;font-size:.82rem;font-weight:650}.chips button.on{background:var(--color-paper);color:var(--color-ink-strong);border-color:#0000}.modal-back{z-index:80;background:#0000007a;place-items:end center;padding:16px;display:grid;position:fixed;inset:0}.modal{background:var(--color-panel);border:1px solid var(--color-line);border-radius:24px;width:min(440px,100%);margin-bottom:64px;padding:18px}.shake{animation:.28s cubic-bezier(.22,1,.36,1) shake}@keyframes shake{0%,to{transform:translate(0)}30%{transform:translate(-5px)}60%{transform:translate(5px)}}@media (width<=959px){.shell:has(.stage){padding-bottom:calc(76px + env(safe-area-inset-bottom))}.stage{flex-direction:column;gap:8px;display:flex}.stage-board,.stage-board.play-stack{flex-direction:column;align-items:center;gap:6px;height:auto;min-height:0;display:flex}.stage .board-slot{justify-content:center;width:100%;display:flex}.stage .board-wrap{width:min(100%,max(220px,100svh - 340px));max-width:100%;margin:0 auto}.stage .panel{border-radius:18px;padding:12px 14px}.stage .panel h2{font-size:1.15rem}.stage .panel p{margin:6px 0 0;font-size:.92rem}}@media (width>=960px){.shell{grid-template-columns:196px 1fr;align-items:start;padding-bottom:32px}.side{flex-direction:column;gap:6px;display:flex;position:sticky;top:76px}.nav-btn{flex-direction:row;justify-content:flex-start;gap:10px;padding:0 12px;font-size:.95rem}.tabbar{display:none}.layout.split{grid-template-columns:minmax(280px,640px) minmax(260px,360px);align-items:start}}@media (prefers-reduced-motion:reduce){.btn,.shake,.piece.fall,.sq.mated-king,.board-wrap.mated .board-frame{transition:none;animation:none}}@property --tw-scale-x{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-y{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-z{syntax:"*";inherits:false;initial-value:1}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-duration{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}@property --tw-content{syntax:"*";inherits:false;initial-value:""}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@keyframes pulse{50%{opacity:.5}}