:root{color-scheme:dark;font-family:Inter,ui-rounded,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:#09121d;color:#f6fbff;--surface:#101c2b;--surface-2:#17283a;--line:#34516a;--text-soft:#a9bfd0;--accent:#66d9c9;--accent-2:#9ce9df;--danger:#ff9d91;--exact:#7fe0b2;--cell:44px;--gap:1px}
*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;min-height:100%;overflow:hidden;overscroll-behavior:none}
body{min-height:100dvh;background:radial-gradient(circle at 50% 0,#18354b 0,#09121d 52%,#060c14 100%);touch-action:manipulation}
button,select,input{font:inherit}
button{min-width:44px;min-height:44px;border:1px solid #3b5d76;border-radius:10px;padding:0 .6rem;background:#17283a;color:#f6fbff;font-weight:720;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
button:hover{background:#20384e}button:disabled{opacity:.42;cursor:not-allowed}button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #a6f2e8;outline-offset:1px}
.game-shell{width:100%;height:100dvh;max-width:760px;margin:0 auto;padding:max(2px,env(safe-area-inset-top)) max(3px,env(safe-area-inset-right)) max(2px,env(safe-area-inset-bottom)) max(3px,env(safe-area-inset-left));display:grid;grid-template-rows:44px 44px minmax(0,1fr) auto 44px 20px;gap:2px;overflow:hidden;position:relative}
.topbar{height:44px;display:flex;align-items:center;justify-content:space-between;gap:4px}.topbar h1{margin:0;font-size:clamp(1.05rem,5vw,1.45rem);letter-spacing:-.035em;white-space:nowrap}.top-actions{display:flex;align-items:center;gap:2px}.compact-button{height:44px;padding:0 .45rem;font-size:.78rem}
.context-strip{height:44px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:5px}.context-button{height:44px;display:flex;align-items:baseline;gap:.35rem;padding:0 .55rem;background:#12263a}.context-button strong{font-size:.82rem}.context-button span{font-size:.7rem;color:var(--accent-2)}.identity-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-soft);font-size:.72rem}.assist-chip{padding:.18rem .38rem;border:1px solid #8d7651;border-radius:999px;background:#302a20;color:#ffe0a6;font-size:.66rem;font-weight:800;white-space:nowrap}
.puzzle-stage{min-height:0;display:grid;place-items:center;overflow:hidden}.equation-board{display:grid;grid-template-columns:repeat(var(--cols,1),var(--cell));grid-template-rows:repeat(var(--rows,1),var(--cell));gap:var(--gap);width:max-content;height:max-content;max-width:100%;touch-action:manipulation;position:relative}.board-cell{width:var(--cell);height:var(--cell);min-width:0;min-height:0;display:grid;place-items:center;position:relative;border-radius:7px;font-weight:820;font-variant-numeric:tabular-nums;user-select:none}.board-cell.noninteractive{font-size:clamp(.86rem,4vw,1.08rem);color:#bdd0dd;background:rgba(18,39,58,.58);border:1px solid rgba(70,102,124,.42)}.board-cell.operator,.board-cell.equals{background:transparent;border-color:transparent;color:#83a1b6;font-size:.9rem}.board-cell.result{background:#20364a;color:#d6ebf8}.board-cell.spacer{background:transparent;border-color:transparent}.slot-button{width:100%;height:100%;min-width:44px;min-height:44px;padding:0;border-radius:8px;background:#183349;border:1px solid #486f89;font-size:clamp(1rem,5vw,1.25rem);position:relative}.slot-button.is-empty{background:rgba(17,39,56,.5);border-style:dashed;color:#7f9aae}.slot-button.is-empty::after{content:"+";font-size:1rem}.slot-button[aria-pressed="true"]{border:3px solid var(--accent);background:#183e48}.slot-button[data-line-state="exact"]::before,.board-cell[data-line-state="exact"]::before{content:"✓";position:absolute;top:1px;right:2px;font-size:.58rem;color:var(--exact)}.slot-button[data-line-state="conflict"]::before,.board-cell[data-line-state="conflict"]::before{content:"!";position:absolute;top:1px;right:3px;font-size:.65rem;color:var(--danger);font-weight:950}.slot-button[data-line-state="conflict"]{border-color:var(--danger);background:#3a2428}.slot-button.is-nudge{box-shadow:inset 0 0 0 3px #f4cc68}.slot-button.is-nudge::after{content:"?";position:absolute;bottom:0;right:3px;font-size:.65rem;color:#ffe69b}
.bank-zone{min-height:44px;display:grid;place-items:center;overflow:hidden}.number-bank{width:min(100%,314px);display:grid;grid-template-columns:repeat(6,minmax(44px,1fr));grid-auto-rows:44px;gap:2px;align-content:center;touch-action:manipulation}.bank-token{min-width:44px;height:44px;min-height:44px;padding:0;border-radius:999px;background:#243b4d;border:1px solid #4f7187;font-size:1rem}.bank-token[aria-selected="true"]{border:3px solid var(--accent);background:#174349}.bank-token[hidden]{display:none}.bank-token[data-order="sorted"]{background:#26384e}
.utility-row{height:44px;display:grid;grid-template-columns:repeat(3,1fr);gap:3px}.utility-row button{height:44px;padding:0 .35rem}.status-zone{height:20px;overflow:hidden;display:flex;align-items:center;justify-content:center}.status-zone p{margin:0;width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:center;color:var(--text-soft);font-size:.67rem}.status-zone p.error{color:#ffd0cb}.status-zone p.success{color:#a6efd0}
.game-tip{position:absolute;left:50%;bottom:72px;z-index:5;display:flex;align-items:center;gap:.5rem;pointer-events:none;width:min(calc(100% - 14px),30rem);padding:.7rem .85rem;border:1px solid #68d9c9;border-radius:999px;background:#0c2d37;color:#eafffb;box-shadow:0 .7rem 2rem rgba(0,0,0,.35);opacity:0;transform:translate(-50%,.5rem);transition:opacity .18s ease,transform .18s ease}.game-tip.is-visible{opacity:1;transform:translate(-50%,0)}.game-tip.is-fading{opacity:0}
.app-dialog,.tutorial-dialog{width:min(calc(100% - 14px),34rem);max-height:min(92dvh,48rem);overflow:auto;border:1px solid #456780;border-radius:16px;padding:1rem;color:#f6fbff;background:#0d1a28;box-shadow:0 1.5rem 4rem rgba(0,0,0,.55)}.app-dialog::backdrop,.tutorial-dialog::backdrop{background:rgba(3,8,13,.76)}.dialog-head{display:flex;justify-content:space-between;align-items:flex-start;gap:.75rem}.dialog-head h2,.tutorial-copy h2{margin:.2rem 0 .45rem;font-size:1.25rem}.eyebrow{text-transform:uppercase;letter-spacing:.14em;color:#73dfd0;font-size:.67rem}.dialog-content{display:grid;gap:.75rem;color:#c7d8e4}.dialog-actions,.tutorial-actions{display:flex;justify-content:flex-end;gap:.5rem;margin-top:1rem;flex-wrap:wrap}.dialog-actions .primary,.primary-action{background:#167565;border-color:#37b5a1}.dialog-actions .danger{background:#6d3030;border-color:#a95a55}.dialog-close{min-height:44px}.settings-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.65rem .8rem;align-items:center}.settings-grid select{min-height:44px;border:1px solid #456780;border-radius:9px;padding:0 .5rem;background:#13283a;color:#fff}.toggle-row{display:flex;align-items:center;gap:.55rem;min-height:44px}.toggle-row input{width:22px;height:22px}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}.mode-grid button[aria-pressed="true"]{border:3px solid var(--accent);background:#183e48}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.45rem}.result-card{padding:.65rem .35rem;border:1px solid #34516a;border-radius:11px;text-align:center;background:#122335}.result-card strong{display:block;font-size:1.1rem}.result-card span{font-size:.7rem;color:#a9bfd0}.rule-list{display:grid;gap:.45rem}.rule-row{display:grid;grid-template-columns:2rem 1fr;gap:.55rem;align-items:start}.rule-row b{width:2rem;height:2rem;border-radius:8px;display:grid;place-items:center;background:#183e48}.rule-row span{display:grid}.rule-row small{color:#a9bfd0;line-height:1.35}
.tutorial-copy p{margin:0;color:#bfd0dc;line-height:1.45}.tutorial-demo{display:grid;grid-template-columns:44px 24px 44px 24px 44px;gap:4px;align-items:center;justify-content:center;margin:1rem 0;padding:1rem;border:1px solid #34516a;border-radius:12px;background:#08131e}.demo-cell{width:44px;height:44px;min-width:44px;min-height:44px;display:grid;place-items:center;border-radius:9px;background:#1a3448;border:1px solid #4f7187;color:#fff;font-weight:850;padding:0}.demo-cell.editable{border:2px solid var(--accent)}.demo-op{text-align:center;color:#89a6ba;font-weight:800}.demo-state{grid-column:1/-1;text-align:center;color:#a9bfd0;font-size:.78rem}.tutorial-demo[data-demo-step="placed"] .demo-cell.editable{background:#21453d}.tutorial-demo[data-demo-step="complete"] .demo-state{color:var(--exact);font-weight:850}.tutorial-demo[data-demo-step="complete"] .demo-state::before{content:"✓ "}.tutorial-caption{min-height:2.25rem;color:#d8eef4}.tutorial-opt-out{display:flex;align-items:center;gap:.5rem;min-height:44px}.tutorial-opt-out input{width:22px;height:22px}
html[data-theme="light"]{color-scheme:light;background:#edf4f4;color:#13202a;--surface:#f7fbfb;--surface-2:#e5f0f0;--line:#9ab3bb;--text-soft:#526b77}html[data-theme="light"] body{background:linear-gradient(#f7fbfb,#dfeaec)}html[data-theme="light"] button,html[data-theme="light"] .slot-button,html[data-theme="light"] .bank-token{color:#152631;background:#e4eeee;border-color:#8aa9b3}html[data-theme="light"] .board-cell.noninteractive{color:#38505e;background:#eef5f5}html[data-theme="light"] .app-dialog,html[data-theme="light"] .tutorial-dialog{color:#13202a;background:#f8fbfb}html[data-theme="light"] .dialog-content,html[data-theme="light"] .tutorial-copy p{color:#425f6c}
html[data-large-font="true"] .slot-button,html[data-large-font="true"] .bank-token{font-size:1.3rem}html[data-large-font="true"] .status-zone p,html[data-large-font="true"] .identity-label{font-size:.78rem}html[data-large-font="true"] .compact-button{font-size:.86rem}
html[data-motion-profile="instant"] *,html[data-motion-profile="instant"] *::before,html[data-motion-profile="instant"] *::after{scroll-behavior:auto!important;transition-duration:1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important}
@media(min-width:520px){.game-shell{grid-template-rows:52px 48px minmax(0,1fr) auto 48px 24px;padding:8px;gap:5px}.topbar,.context-strip{height:auto}.compact-button,.context-button,.utility-row,.utility-row button{height:48px}.equation-board{--gap:3px}.number-bank{width:min(100%,420px);grid-template-columns:repeat(8,minmax(44px,1fr));gap:4px}.status-zone{height:24px}.status-zone p{font-size:.78rem}}
@media(max-height:650px) and (min-width:700px){.game-shell{max-width:1024px;grid-template-columns:minmax(0,1fr) 20rem;grid-template-rows:44px 44px minmax(0,1fr) 44px 20px;gap:3px}.topbar,.context-strip,.status-zone{grid-column:1/-1}.puzzle-stage{grid-column:1;grid-row:3/5}.bank-zone{grid-column:2;grid-row:3;align-self:center}.number-bank{grid-template-columns:repeat(4,minmax(44px,1fr));width:100%}.utility-row{grid-column:2;grid-row:4}.status-zone{grid-row:5}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important}}