:root{--bb-sun-ink: #815811;--bb-bg: #ffffff;--bb-surface: #ffffff;--bb-surface-2: #fef0f4;--bb-surface-3: #f4d3de;--bb-berry: #c3195d;--bb-berry-fill: var(--bb-berry);--bb-berry-ink: var(--bb-berry);--bb-berry-deep: #8e1346;--bb-berry-light: #fdd4e1;--bb-juice: #ff7a9c;--bb-ink-on-bright: #1a0c16;--bb-lime: #7dd87a;--bb-lime-deep: #4fa84c;--bb-sun: #ffb93b;--bb-sun-deep: #cc8a1a;--bb-exam: #a059d9;--bb-exam-deep: #7036b0;--bb-exam-border: var(--bb-exam-deep);--bb-ink: #2a1020;--bb-ink-soft: #6b4556;--bb-muted: #846471;--bb-border: #f4d3de;--bb-border-strong: #e8b8c8;--bb-success: #4fa84c;--bb-error: #d93857;--bb-warn: #cc8a1a;--bb-danger-ink: #b3123f;--bb-font-display: "Nunito", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--bb-font-body: "Nunito", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--bb-font-mono: "JetBrains Mono", ui-monospace, monospace;--bb-fs-display-xl: 1.875rem;--bb-fs-display-l: 1.5rem;--bb-fs-heading: 1rem;--bb-fs-body: max(.875rem, 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255, 255, .12);--bb-chunk-neutral: 0 4px 0 var(--bb-border-strong);--bb-chunk-sm-neutral: 0 3px 0 var(--bb-border-strong)}[data-scheme=ocean]{--bb-sun-ink: #855c14;--bb-berry: #0e7da7;--bb-berry-deep: #0a6088;--bb-berry-light: #cfeaf6;--bb-juice: #4cc4e6;--bb-lime: #24c2a0;--bb-lime-deep: #168772;--bb-sun: #ffc466;--bb-sun-deep: #c98c1f;--bb-surface-2: #eef4f7;--bb-surface-3: #d8e6ee;--bb-border: #d0e1ea;--bb-border-strong:#b3cdda;--bb-chunk-berry: 0 4px 0 #0a6088;--bb-chunk-sm-berry: 0 3px 0 #0a6088;--bb-chunk-lime: 0 4px 0 #168772;--bb-chunk-sm-lime: 0 3px 0 #168772;--bb-chunk-sun: 0 4px 0 #c98c1f;--bb-chunk-sm-sun: 0 3px 0 #c98c1f;--bb-chunk-neutral: 0 4px 0 #d0e1ea;--bb-chunk-sm-neutral: 0 3px 0 #d0e1ea}[data-scheme=forest]{--bb-sun-ink: #7f5b14;--bb-berry: #2d844c;--bb-berry-ink: #267041;--bb-berry-deep: #1f5e36;--bb-berry-light: #d6efdc;--bb-juice: #6cc888;--bb-lime: #a3d977;--bb-lime-deep: #6ea44a;--bb-sun: #f4b840;--bb-sun-deep: #b8841d;--bb-surface-2: #f5f1e8;--bb-surface-3: #e7decd;--bb-border: #dbe5cf;--bb-border-strong:#bccea8;--bb-chunk-berry: 0 4px 0 #1f5e36;--bb-chunk-sm-berry: 0 3px 0 #1f5e36;--bb-chunk-lime: 0 4px 0 #6ea44a;--bb-chunk-sm-lime: 0 3px 0 #6ea44a;--bb-chunk-sun: 0 4px 0 #b8841d;--bb-chunk-sm-sun: 0 3px 0 #b8841d;--bb-chunk-neutral: 0 4px 0 #dbe5cf;--bb-chunk-sm-neutral: 0 3px 0 #dbe5cf}[data-scheme=sunset]{--bb-sun-ink: #7e620f;--bb-berry: #d83a4a;--bb-berry-ink: #bf2635;--bb-berry-deep: #9c2530;--bb-berry-light: #ffd9d4;--bb-juice: #ff8a7a;--bb-lime: #f59c2f;--bb-lime-deep: #b86e15;--bb-sun: #ffd23f;--bb-sun-deep: #c79a18;--bb-surface-2: #fff1e8;--bb-surface-3: #ffe1cf;--bb-border: #f5dccb;--bb-border-strong:#e8b89b;--bb-chunk-berry: 0 4px 0 #9c2530;--bb-chunk-sm-berry: 0 3px 0 #9c2530;--bb-chunk-lime: 0 4px 0 #b86e15;--bb-chunk-sm-lime: 0 3px 0 #b86e15;--bb-chunk-sun: 0 4px 0 #c79a18;--bb-chunk-sm-sun: 0 3px 0 #c79a18;--bb-chunk-neutral: 0 4px 0 #f5dccb;--bb-chunk-sm-neutral: 0 3px 0 #f5dccb}[data-scheme=midnight]{--bb-berry: #a955f7;--bb-berry-fill: #9a4de1;--bb-berry-ink: #c286f9;--bb-line: var(--bb-border);--bb-bg-soft: var(--bb-surface-2);--bb-danger: var(--bb-danger-ink);--bb-skeleton-a: rgba(255, 255, 255, .06);--bb-skeleton-b: rgba(255, 255, 255, .12);--bb-berry-deep: #6e2bb8;--bb-berry-light: #2b1d4a;--bb-juice: #c389ff;--bb-lime: #22d3ee;--bb-lime-deep: #0e8aa3;--bb-sun: #fbbf24;--bb-sun-deep: #b8841d;--bb-bg: #0f172a;--bb-surface: #1e293b;--bb-surface-2: #1a2235;--bb-surface-3: #2a3550;--bb-ink: #e8eaf3;--bb-ink-soft: #a8b1c8;--bb-muted: #8891a8;--bb-danger-ink: #f4788d;--bb-border: #2c3956;--bb-border-strong:#43547a;--bb-chunk-berry: 0 4px 0 #6e2bb8;--bb-chunk-sm-berry: 0 3px 0 #6e2bb8;--bb-chunk-lime: 0 4px 0 #0e8aa3;--bb-chunk-sm-lime: 0 3px 0 #0e8aa3;--bb-chunk-sun: 0 4px 0 #b8841d;--bb-chunk-sm-sun: 0 3px 0 #b8841d;--bb-chunk-neutral: 0 4px 0 #2c3956;--bb-chunk-sm-neutral: 0 3px 0 #2c3956}[data-scheme=mono]{--bb-sun-ink: #77651d;--bb-berry: #1f1f23;--bb-berry-deep: #000000;--bb-berry-light: #e5e5e8;--bb-juice: #4a4a55;--bb-lime: #3a8d6b;--bb-lime-deep: #1f5b41;--bb-sun: #bb9f3a;--bb-sun-deep: #7d6a1f;--bb-exam: #8f8a9c;--bb-exam-deep: #443f52;--bb-surface-2: #f4f5f7;--bb-surface-3: #e6e8ec;--bb-border: #dadce0;--bb-border-strong:#bbbec4;--bb-chunk-berry: 0 4px 0 #000000;--bb-chunk-sm-berry: 0 3px 0 #000000;--bb-chunk-lime: 0 4px 0 #1f5b41;--bb-chunk-sm-lime: 0 3px 0 #1f5b41;--bb-chunk-sun: 0 4px 0 #7d6a1f;--bb-chunk-sm-sun: 0 3px 0 #7d6a1f;--bb-chunk-neutral: 0 4px 0 #dadce0;--bb-chunk-sm-neutral: 0 3px 0 #dadce0}[data-theme=dark][data-scheme=ocean]{--bb-berry: #0f8ab8;--bb-berry-fill: #0e7ea7;--bb-bg: #08161e;--bb-surface: #102434;--bb-surface-2: #0c1c2a;--bb-surface-3: #18334a;--bb-ink: #e6f1f8;--bb-ink-soft: #9bb6c8;--bb-muted: #718ea0;--bb-border: #1f3b56;--bb-border-strong:#345a7a;--bb-berry-light: #1a3650;--bb-berry-ink: #12a6de;--bb-chunk-neutral: 0 4px 0 var(--bb-border-strong);--bb-chunk-sm-neutral: 0 3px 0 var(--bb-border-strong)}[data-theme=dark][data-scheme=forest]{--bb-berry: #2f8a4f;--bb-berry-fill: #2d844c;--bb-bg: #0d1a10;--bb-surface: #15291e;--bb-surface-2: #11211a;--bb-surface-3: #1f3a2a;--bb-ink: #e7f1e9;--bb-ink-soft: #a4bca9;--bb-muted: #79927f;--bb-border: #234d34;--bb-border-strong:#387550;--bb-berry-light: #1f3d2a;--bb-berry-ink: #3db467;--bb-chunk-neutral: 0 4px 0 var(--bb-border-strong);--bb-chunk-sm-neutral: 0 3px 0 var(--bb-border-strong)}[data-theme=dark][data-scheme=sunset]{--bb-bg: #1a0e08;--bb-surface: #2c1a12;--bb-surface-2: #22130c;--bb-surface-3: #3a2418;--bb-ink: #f5e6dc;--bb-ink-soft: #c4a791;--bb-muted: #9d8271;--bb-border: #4d2e1c;--bb-border-strong:#74462a;--bb-berry-light: #4a2418;--bb-berry-ink: #e26d79;--bb-chunk-neutral: 0 4px 0 var(--bb-border-strong);--bb-chunk-sm-neutral: 0 3px 0 var(--bb-border-strong)}[data-theme=dark][data-scheme=mono]{--bb-bg: #0a0a0c;--bb-surface: #18181c;--bb-surface-2: #131316;--bb-surface-3: #24242a;--bb-ink: #f0f0f3;--bb-ink-soft: #b0b0b8;--bb-muted: #80808a;--bb-border: #2c2c33;--bb-border-strong:#44444d;--bb-berry-light: #2a2a30;--bb-berry-ink: #b4b4bc;--bb-chunk-neutral: 0 4px 0 var(--bb-border-strong);--bb-chunk-sm-neutral: 0 3px 0 var(--bb-border-strong)}:root{--bb-key-ink: var(--bb-key-colour, var(--accent, #c3195d))}[data-theme=dark]{--bb-key-ink: var(--bb-key-colour-on-dark-berry, var(--bb-key-colour-on-dark, var(--bb-ink, #f4e4eb)))}[data-theme=dark][data-scheme=ocean]{--bb-key-ink: var(--bb-key-colour-on-dark-ocean, var(--bb-key-colour-on-dark, var(--bb-ink, #f4e4eb)))}[data-theme=dark][data-scheme=forest]{--bb-key-ink: var(--bb-key-colour-on-dark-forest, var(--bb-key-colour-on-dark, var(--bb-ink, #f4e4eb)))}[data-theme=dark][data-scheme=sunset]{--bb-key-ink: var(--bb-key-colour-on-dark-sunset, var(--bb-key-colour-on-dark, var(--bb-ink, #f4e4eb)))}[data-theme=dark][data-scheme=mono]{--bb-key-ink: var(--bb-key-colour-on-dark-mono, var(--bb-key-colour-on-dark, var(--bb-ink, #f4e4eb)))}[data-scheme=midnight][data-scheme]{--bb-key-ink: var(--bb-key-colour-on-dark-midnight, var(--bb-key-colour-on-dark, var(--bb-ink, #f4e4eb)))}[data-subject=biology]{--bb-subj: #7dd87a;--bb-subj-deep: #4fa84c}[data-subject=chemistry]{--bb-subj: #c3195d;--bb-subj-deep: #8e1346}[data-subject=physics]{--bb-subj: #ffb93b;--bb-subj-deep: #cc8a1a}[data-subject=maths],[data-subject=mathematics]{--bb-subj: #5a7cff;--bb-subj-deep: #3a54c9}[data-subject=english]{--bb-subj: #a059d9;--bb-subj-deep: #7036b0}[data-subject=history]{--bb-subj: #d47a00;--bb-subj-deep: #9c5800}[data-subject=geography]{--bb-subj: #2d9c8a;--bb-subj-deep: #1a6b5e}[data-subject=computing]{--bb-subj: #5a3a6b;--bb-subj-deep: #3c2747}[data-subject=languages]{--bb-subj: #2d9c8a;--bb-subj-deep: #1a6b5e}[data-subject]:not([data-subject=biology]):not([data-subject=chemistry]):not([data-subject=physics]):not([data-subject=maths]):not([data-subject=mathematics]):not([data-subject=english]):not([data-subject=history]):not([data-subject=geography]):not([data-subject=computing]):not([data-subject=languages]){--bb-subj: var(--bb-berry);--bb-subj-deep: var(--bb-berry-deep)}:root{--bb-fs-field-12: var(--bb-fs-12);--bb-fs-field-13: var(--bb-fs-13);--bb-fs-field-14: var(--bb-fs-14)}@media (max-width: 760px){:root{--bb-fs-field-12: var(--bb-fs-16);--bb-fs-field-13: var(--bb-fs-16);--bb-fs-field-14: var(--bb-fs-16)}}[data-theme=dark],[data-theme=dark][data-scheme]{--bb-sun-ink: var(--bb-sun-deep)}[data-theme=dark][data-scheme=ocean]{--bb-sun-ink: #cb8e1f}[data-theme=dark][data-scheme=forest]{--bb-sun-ink: #ce9420}[data-theme=dark][data-scheme=mono]{--bb-sun-ink: #a28a29}[data-scheme=midnight][data-scheme]{--bb-sun-ink: #d09521}:root{--bb-wordmark-brain: #0F2E54;--bb-wordmark-berry: #A41263}[data-theme=dark],[data-theme=dark][data-scheme],[data-scheme=midnight][data-scheme]{--bb-wordmark-brain: #cfe0f5;--bb-wordmark-berry: #ff8fc3}:root{--bb-ctl-radius: 14px;--bb-ctl-radius-sm: 10px;--bb-ctl-focus: 3px solid var(--bb-berry-ink);--bb-ctl-focus-offset: 2px;--bb-ctl-motion: .12s;--bb-ctl-disabled-opacity: .5;--bb-ctl-hover-filter: brightness(.93);--bb-ctl-press-shift: 2px;--bb-btn-primary-bg: var(--bb-berry-fill);--bb-btn-primary-ink: #ffffff;--bb-btn-primary-edge: var(--bb-berry-deep);--bb-btn-hero-bg: #ffffff;--bb-btn-secondary-bg: var(--bb-surface-2);--bb-btn-secondary-hover: var(--bb-surface-3);--bb-btn-secondary-ink: var(--bb-ink);--bb-btn-secondary-border: var(--bb-border);--bb-btn-secondary-edge: var(--bb-border-strong);--bb-btn-danger-bg: #c0201d;--bb-btn-danger-ink: #ffffff;--bb-btn-danger-edge: #8a1512;--bb-btn-premium-bg: linear-gradient(160deg, #9b5bd6 0%, #6e2fae 100%);--bb-btn-premium-ink: #ffffff;--bb-btn-premium-edge: #5a2590;--bb-btn-play-bg: var(--bb-lime);--bb-btn-play-ink: var(--bb-ink-on-bright, #1a0c16);--bb-btn-play-edge: var(--bb-lime-deep);--bb-btn-test-bg: var(--bb-sun);--bb-btn-test-ink: var(--bb-ink-on-bright, #1a1a1a);--bb-btn-test-edge: var(--bb-sun-deep);--bb-mode-radius: 16px;--bb-mode-radius-sm: 12px;--bb-mode-border-w: 2px;--bb-mode-edge-h: 4px;--bb-mode-edge-h-sm: 3px;--bb-mode-font: var(--bb-fs-16);--bb-mode-font-sm: var(--bb-fs-13);--bb-mode-pad: 12px 16px;--bb-mode-pad-sm: 8px 12px;--bb-mode-disabled-opacity: .45;--bb-icon-btn-size: 36px;--bb-icon-btn-size-sm: 28px;--bb-icon-btn-ink: var(--bb-ink-soft);--bb-icon-btn-hover-bg: var(--bb-surface-2);--bb-icon-btn-hover-ink: var(--bb-ink);--bb-icon-btn-active-bg: var(--bb-surface-3);--bb-selected-bg: var(--bb-berry-light);--bb-selected-ink: var(--bb-berry-deep);--bb-selected-border: var(--bb-berry-deep);--bb-toggle-w: 38px;--bb-toggle-h: 22px;--bb-toggle-knob: 16px;--bb-toggle-hit: 44px;--bb-toggle-on: var(--bb-btn-primary-bg);--bb-toggle-on-border: 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(orientation:landscape){.app:not(.bb-shell-host){max-width:100%}}.auth-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px}.auth-logo{font-size:var(--bb-fs-28);font-weight:700;font-family:var(--bb-font-mono);color:var(--accent);margin-bottom:4px;letter-spacing:-.02em}.auth-sub{font-size:var(--bb-fs-11);color:var(--muted);margin-bottom:32px;font-family:var(--bb-font-mono)}.auth-card{background:var(--surface);border:1.5px solid var(--border);border-radius:20px;padding:24px;width:100%;max-width:360px}.auth-title{font-size:var(--bb-fs-16);font-weight:700;margin-bottom:16px;color:var(--text)}.auth-input{width:100%;padding:10px 12px;background:var(--surface2);border:1.5px solid var(--border);border-radius:9px;font-family:var(--bb-font-display);font-size:var(--bb-fs-13);color:var(--text);outline:none;margin-bottom:10px;transition:border-color 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14px}.games-sheet-title{font-size:var(--bb-fs-16);font-weight:700;padding:0 16px 10px;font-family:var(--bb-font-mono);color:var(--text)}.game-card{display:flex;align-items:center;gap:12px;padding:10px 16px;border-radius:12px;cursor:pointer;transition:background .12s;border:none;width:100%;text-align:left;background:transparent}.game-card:hover:not(.disabled){background:var(--surface2)}.game-card.disabled{opacity:.4;cursor:not-allowed}.game-card.premium-locked{border-left:3px solid var(--warn)}.game-icon{font-size:var(--bb-fs-28);flex-shrink:0;width:40px;text-align:center}.game-info{flex:1}.game-name{font-size:var(--bb-fs-14);font-weight:700;color:var(--text)}.game-desc{font-size:var(--bb-fs-11);color:var(--muted);margin-top:1px}.game-badges{display:flex;gap:5px;margin-top:4px;flex-wrap:wrap}.game-badge{font-size:var(--bb-fs-9);font-weight:700;padding:2px 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solid var(--border);background:var(--surface2);color:var(--muted);transition:all .15s;white-space:nowrap;font-family:var(--bb-font-mono);text-transform:uppercase;letter-spacing:.05em}.category-tab.active{background:var(--accent);border-color:var(--accent);color:var(--btn-text)}.topic-chips-row{display:flex;flex-wrap:wrap;gap:5px;padding-bottom:2px;max-height:93px;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding-right:2px}.topic-chips-row::-webkit-scrollbar{display:none}.topic-chip{flex-shrink:0;padding:4px 10px;border-radius:14px;font-size:var(--bb-fs-11);font-weight:600;cursor:pointer;border:1.5px solid var(--border);background:var(--surface2);color:var(--muted);transition:all 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6px;border-radius:5px;font-family:var(--bb-font-mono);text-transform:uppercase;background:var(--badge-bg);color:var(--badge-text)}.seen-dot{position:absolute;top:9px;width:8px;height:8px;background:var(--accent);border-radius:50%;box-shadow:0 0 6px var(--accent)}.gotit-mark{position:absolute;cursor:pointer;background:var(--accent);color:var(--btn-text);font-size:var(--bb-fs-10);font-weight:700;width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 1px 4px #00000040}.card-topic-label{display:inline-block;font-size:var(--bb-fs-9);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-family:var(--bb-font-mono);background:var(--bb-berry-fill);color:#fff;border-radius:20px;padding:3px 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ease}.card-more-details:hover{background:#555;border-color:#555}.card-more-details-fixed{left:auto;right:12px;bottom:12px;transform:none;z-index:11}.bb-why-btn{background:var(--bb-btn-primary-bg);border-color:var(--bb-btn-primary-edge);color:var(--bb-btn-primary-ink)}.bb-why-btn:hover{filter:var(--bb-ctl-hover-filter)}.flashcard-stage[data-card-fill=on] 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var(--bb-border);color:var(--bb-icon-btn-ink);width:22px;height:22px;border-radius:5px;cursor:pointer;font-size:var(--bb-fs-11);display:flex;align-items:center;justify-content:center;padding:0;font-family:var(--bb-font-mono)}.corner-btn:hover{background:var(--bb-icon-btn-hover-bg);color:var(--bb-icon-btn-hover-ink)}.corner-btn.on{background:var(--bb-selected-bg);border-color:var(--bb-selected-border);color:var(--bb-selected-ink)}.corner-btn:focus-visible{outline:var(--bb-ctl-focus);outline-offset:var(--bb-ctl-focus-offset)}.card-audio-row{display:flex;gap:4px;align-items:center}.auto-fab{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:var(--bb-fs-18);cursor:pointer;border:2px solid var(--accent);background:var(--surface);color:var(--accent);box-shadow:0 2px 12px #0000002e;transition:all 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var(--border);color:var(--text)}.btn-restart{background:transparent;border:none;color:var(--muted);font-size:var(--bb-fs-11);cursor:pointer;padding:5px;font-family:var(--bb-font-mono)}.grid-area{display:grid;grid-template-columns:1fr;gap:10px;padding:0 14px 14px;align-content:start}.grid-card{position:relative;perspective:1200px;cursor:pointer}.grid-card-inner{width:100%;transform-style:preserve-3d;transition:transform var(--grid-anim);position:relative;min-height:110px}.grid-card-inner.flipped{transform:rotateY(180deg)}.grid-face{position:relative;background:var(--surface);border:1.5px solid var(--border);border-radius:12px;padding:12px 12px 32px;display:block;backface-visibility:hidden;-webkit-backface-visibility:hidden;min-height:110px}.grid-back{position:absolute;inset:0;background:color-mix(in srgb,var(--surface2) 60%,#000 40%);border:1.5px solid color-mix(in srgb,var(--border) 50%,#000 50%);transform:rotateY(180deg);padding:12px 12px 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