@font-face{font-family:Rubik Iso;src:url(/assets/brainblox/fonts/RubikIso-Regular.ttf) format("truetype");font-weight:400;font-style:normal;font-display:swap}:root{--bg-deep: #1C1208;--bg-mid: #2A1A0A;--bg-card: #0E0906;--bg-glass: rgba(28, 18, 8, .85);--bg-glass-light: rgba(255, 255, 255, .06);--border-subtle: rgba(255, 255, 255, .08);--border-glow: rgba(255, 255, 255, .15);--text-primary: #F5EFE6;--text-secondary: rgba(245, 239, 230, .6);--text-muted: rgba(245, 239, 230, .35);--green: #639922;--green-dark: #3B6D11;--green-glow: rgba(99, 153, 34, .3);--green-light: #97C459;--gold: #EF9F27;--gold-dark: #854F0B;--gold-glow: rgba(239, 159, 39, .25);--gold-light: #FAC775;--coral: #E24B4A;--coral-dark: #A32D2D;--coral-glow: rgba(226, 75, 74, .25);--blue: #448aff;--blue-light: #82b1ff;--blue-glow: rgba(68, 138, 255, .25);--purple: #b388ff;--purple-dark: #9c27b0;--purple-glow: rgba(179, 136, 255, .25);--cyan: #18ffff;--cyan-dark: #00e5ff;--cyan-glow: rgba(24, 255, 255, .2);--orange: #EF9F27;--mud: #8B5E3C;--mud-dark: #7A5230;--mud-glow: rgba(139, 94, 60, .3);--dirt: #7A5230;--parchment: #F5EFE6;--night: #1C1208;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-xl: 28px;--shadow-soft: 0 4px 24px rgba(0, 0, 0, .4);--shadow-glow-green: 0 0 24px var(--green-glow), 0 0 60px rgba(99, 153, 34, .08);--shadow-glow-gold: 0 0 20px var(--gold-glow);--shadow-glow-blue: 0 0 20px var(--blue-glow);--font-brand: "Rubik Iso", sans-serif;--font-display: "Fredoka", "Nunito", sans-serif;--font-body: "Nunito", "Segoe UI", system-ui, 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rotate(15deg);opacity:0}}.start-deco-block{position:absolute;width:40px;height:40px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-family:var(--font-brand);font-size:18px;pointer-events:none;opacity:.15;animation:startDecoFloat 6s ease-in-out infinite}.start-deco-block-top{position:absolute;top:0;left:0;right:0;height:10px;border-radius:8px 8px 0 0}@keyframes startDecoFloat{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-18px) rotate(6deg)}}.start-ground{position:absolute;bottom:0;left:0;right:0;z-index:5;pointer-events:none}.sg-grass{height:28px;background:#3b6d11;display:flex;align-items:flex-end;gap:8px;padding:0 24px;overflow:hidden}.sg-blade{border-radius:3px 3px 0 0;background:#97c459;flex-shrink:0;animation:sgSway 2s ease-in-out infinite alternate;transform-origin:bottom center}@keyframes sgSway{0%{transform:rotate(-4deg)}to{transform:rotate(4deg)}}.sg-dirt{height:18px;background:#8b5e3c}.sg-ore{height:18px;background:#7a5230;overflow:hidden;position:relative}.sg-ore-track{display:flex;gap:8px;align-items:center;white-space:nowrap;width:max-content;padding:4px 0;animation:sgOreScroll 12s linear infinite}@keyframes sgOreScroll{0%{transform:translate(0)}to{transform:translate(-50%)}}.sg-ore-fleck{height:8px;border-radius:3px;flex-shrink:0;animation:sgOreGlow 2s infinite alternate}@keyframes sgOreGlow{0%{opacity:.7}to{opacity:1;box-shadow:0 0 6px currentColor}}.sg-deep{height:30px;background:#412402}.start-content{text-align:center;max-width:620px;padding:40px 20px}.bb-logo{display:flex;flex-direction:column;align-items:center;gap:4px;animation:brandFloat 3s ease-in-out infinite}.bb-logo-blocks{display:flex;gap:6px}.bb-blk{width:52px;height:52px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:900;position:relative;overflow:hidden;flex-shrink:0}.bb-blk-top{position:absolute;top:0;left:0;right:0;height:13px;border-radius:8px 8px 0 0}.bb-blk-sym{position:relative;z-index:1;margin-top:6px;font-family:var(--font-brand)}.bb-blk.grass{background:#8b5e3c}.bb-blk.grass .bb-blk-top{background:#639922}.bb-blk.grass .bb-blk-sym{color:#c0dd97}.bb-blk.dirt{background:#7a5230}.bb-blk.dirt .bb-blk-top{background:#97c459}.bb-blk.dirt .bb-blk-sym{color:#fac775}.bb-blk.lava{background:#a32d2d}.bb-blk.lava .bb-blk-top{background:#e24b4a}.bb-blk.lava .bb-blk-sym{color:#faeeda}.bb-blk.ore{background:#854f0b}.bb-blk.ore .bb-blk-top{background:#ef9f27}.bb-blk.ore .bb-blk-sym{color:#faeeda}.bb-wordmark{font-family:var(--font-brand);font-size:54px;line-height:1;letter-spacing:1px}.bb-wordmark .wg{color:#3b6d11}.bb-wordmark .wm{color:#8b5e3c}.bb-wordmark .wr{color:#e24b4a}.bb-wordmark .wo{color:#ef9f27}.bb-pill{display:inline-block;background:#8b5e3c;color:#f5efe6;font-size:9px;font-weight:600;letter-spacing:2px;text-transform:uppercase;padding:5px 14px;border-radius:20px;font-family:var(--font-body)}.bb-logo.sm .bb-blk{width:36px;height:36px;border-radius:6px;font-size:16px}.bb-logo.sm .bb-blk-top{height:9px;border-radius:6px 6px 0 0}.bb-logo.sm .bb-blk-sym{margin-top:4px}.bb-logo.sm .bb-wordmark{font-size:38px}.bb-logo.sm .bb-logo-blocks{gap:4px}.start-logo-img{max-width:340px;width:80%;height:auto;margin-bottom:8px;filter:drop-shadow(0 4px 20px rgba(99,153,34,.3));animation:brandFloat 3s ease-in-out infinite}@keyframes brandFloat{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.tagline{font-family:var(--font-body);font-size:1.2rem;font-weight:600;color:var(--text-secondary);margin-bottom:28px}.start-brand-blocks{display:flex;justify-content:center;gap:6px;margin-bottom:12px}.brand-blk{width:52px;height:52px;border-radius:8px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;animation:float 3s ease-in-out infinite}.brand-blk:nth-child(2){animation-delay:.3s}.brand-blk:nth-child(3){animation-delay:.6s}.brand-blk:nth-child(4){animation-delay:.9s}.brand-blk-top{position:absolute;top:0;left:0;right:0;height:13px;border-radius:8px 8px 0 0}.brand-blk-sym{position:relative;z-index:1;margin-top:6px;font-family:var(--font-brand);font-size:22px;font-weight:900}.brand-blk.bg-grass{background:#8b5e3c}.brand-blk.bg-grass .brand-blk-top{background:#639922}.brand-blk.bg-grass .brand-blk-sym{color:#c0dd97}.brand-blk.bg-dirt{background:#7a5230}.brand-blk.bg-dirt .brand-blk-top{background:#97c459}.brand-blk.bg-dirt .brand-blk-sym{color:#fac775}.brand-blk.bg-lava{background:#a32d2d}.brand-blk.bg-lava .brand-blk-top{background:#e24b4a}.brand-blk.bg-lava .brand-blk-sym{color:#faeeda}.brand-blk.bg-ore{background:#854f0b}.brand-blk.bg-ore .brand-blk-top{background:#ef9f27}.brand-blk.bg-ore .brand-blk-sym{color:#faeeda}.brand-pill{display:inline-block;background:#412402;color:#ef9f27;font-size:11px;font-weight:600;letter-spacing:2px;text-transform:uppercase;padding:5px 14px;border-radius:20px;margin-bottom:8px}@keyframes float{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-14px) rotate(4deg)}}.difficulty-select{margin-bottom:22px}.difficulty-select h3{font-family:var(--font-display);font-size:1.05rem;font-weight:600;color:var(--text-secondary);margin-bottom:12px}.difficulty-options{display:flex;gap:10px;justify-content:center}.difficulty-btn{padding:14px 18px;border:2px solid var(--border-glow);border-radius:var(--radius-md);background:var(--bg-glass-light);color:var(--text-primary);cursor:pointer;transition:all .25s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column;gap:4px;min-width:115px;font-family:var(--font-body);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.difficulty-btn:hover{background:#ffffff1a;transform:translateY(-3px);box-shadow:var(--shadow-soft)}.difficulty-btn.selected{border-color:var(--green);background:#00e6761f;box-shadow:var(--shadow-glow-green)}.difficulty-btn.easy.selected{border-color:#639922;background:#63992226;box-shadow:var(--shadow-glow-green)}.difficulty-btn.medium.selected{border-color:#ef9f27;background:#ef9f271f;box-shadow:var(--shadow-glow-gold)}.difficulty-btn.hard.selected{border-color:#e24b4a;background:#e24b4a1f;box-shadow:0 0 20px var(--coral-glow)}.diff-label{font-family:var(--font-display);font-weight:600;font-size:1rem}.diff-age{font-size:.72rem;color:var(--text-muted);font-weight:600}.diff-ops{font-size:1.15rem;margin-top:4px;opacity:.8}.play-btn{padding:16px 56px;font-family:var(--font-brand);font-size:1.6rem;font-weight:400;border:none;border-radius:var(--radius-lg);background:linear-gradient(135deg,#639922,#3b6d11);color:#eaf3de;cursor:pointer;transition:all .25s cubic-bezier(.4,0,.2,1);margin-bottom:20px;letter-spacing:2px;box-shadow:0 6px 28px var(--green-glow),inset 0 1px #fff3;-webkit-text-stroke:1.5px currentColor;paint-order:stroke fill;text-shadow:0 2px 4px rgba(0,0,0,.3)}.play-btn:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 10px 40px var(--green-glow),inset 0 1px #fff3}.play-btn:active{transform:translateY(0) scale(.98)}.start-instructions{text-align:left;background:#0e090680;border:1px solid rgba(139,94,60,.2);border-radius:var(--radius-md);padding:16px 20px;font-size:.82rem;color:var(--text-secondary);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.start-instructions ul{padding-left:20px;margin-top:6px}.start-instructions li{margin-bottom:4px}.hud{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:56}.hud>*{pointer-events:auto}.hud-top{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:linear-gradient(180deg,rgba(0,0,0,.55) 0%,transparent 100%)}.hud-coins{display:flex;align-items:center;gap:6px;background:#00000073;border:1px solid rgba(255,215,64,.15);padding:6px 14px;border-radius:24px;font-family:var(--font-display);font-weight:600;font-size:1.1rem;color:var(--gold)}.coin-icon{font-size:1.3rem}.hud-stats{display:flex;gap:14px;font-size:.85rem;font-weight:600;color:#ffffffb3}.streak{color:var(--gold);font-weight:800;text-shadow:0 0 8px var(--gold-glow)}.hud-buttons{display:flex;gap:6px}.hud-btn{padding:6px 14px;border:1px solid var(--border-glow);border-radius:var(--radius-sm);background:#00000073;color:#ffffffd9;cursor:pointer;font-family:var(--font-body);font-size:.8rem;font-weight:700;transition:all .2s;touch-action:manipulation;-webkit-tap-highlight-color:transparent;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.hud-btn:hover{background:#ffffff26;border-color:#ffffff4d}.flight-fuel-bar{position:absolute;top:60px;left:50%;transform:translate(-50%);width:250px;text-align:center;pointer-events:none;z-index:10}.flight-fuel-label{font-family:var(--font-display);font-size:.78rem;font-weight:600;color:var(--cyan);text-shadow:0 0 8px var(--cyan-glow);margin-bottom:4px}.flight-fuel-track{width:100%;height:8px;background:#00000080;border-radius:4px;overflow:hidden;border:1px solid rgba(24,255,255,.2)}.flight-fuel-fill{height:100%;background:linear-gradient(90deg,var(--cyan),var(--cyan-dark));border-radius:4px;transition:width .3s linear;box-shadow:0 0 8px var(--cyan-glow)}.flight-fuel-hint{font-size:.62rem;color:var(--text-muted);margin-top:3px}.tool-feedback{position:absolute;top:55%;left:50%;transform:translate(-50%);background:#ff3c3ce6;color:#fff;padding:8px 20px;border-radius:var(--radius-sm);font-family:var(--font-display);font-size:15px;font-weight:600;pointer-events:none;animation:feedbackFade 1.5s ease-out forwards;z-index:100;box-shadow:0 4px 16px #ff3c3c4d}@keyframes feedbackFade{0%{opacity:1;transform:translate(-50%) translateY(0)}70%{opacity:1}to{opacity:0;transform:translate(-50%) translateY(-20px)}}.crosshair{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:22px;color:#fff9;pointer-events:none;text-shadow:0 0 6px rgba(0,0,0,.6);font-weight:300}.unified-bar{position:absolute;bottom:20px;left:50%;transform:translate(-50%);background:var(--bg-glass);border-radius:var(--radius-md);border:1px solid var(--border-glow);overflow:hidden;z-index:30;-webkit-tap-highlight-color:transparent;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 8px 32px #00000080}.bar-tabs{display:flex;border-bottom:1px solid var(--border-subtle)}.bar-tab{flex:1;padding:5px 16px;background:none;border:none;color:var(--text-muted);font-family:var(--font-body);font-size:.7rem;font-weight:700;cursor:pointer;transition:all .2s;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.bar-tab:hover{color:#ffffffb3;background:#ffffff0a}.bar-tab.active{color:var(--green);background:#00e67614;border-bottom:2px solid var(--green)}.bar-content{padding:6px 8px}.bar-slots{display:flex;gap:4px}.bar-slot{width:50px;height:50px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg-glass-light);border:2px solid transparent;border-radius:var(--radius-sm);cursor:pointer;font-size:1.2rem;transition:all .2s;position:relative;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.bar-slot:hover{background:#ffffff1f;border-color:var(--border-glow)}.bar-slot.active{border-color:var(--green);background:#00e67626;box-shadow:inset 0 0 12px #00e6761a,0 0 8px #00e67626}.slot-key{position:absolute;top:1px;left:3px;font-size:.5rem;font-weight:800;opacity:.35;line-height:1}.slot-icon{font-size:1.2rem;line-height:1}.slot-label{font-size:.5rem;margin-top:1px;opacity:.6;line-height:1;font-weight:700}.castle-indicator{position:absolute;top:58px;left:50%;transform:translate(-50%);background:#00000080;border:1px solid rgba(255,215,64,.15);padding:4px 14px;border-radius:20px;font-family:var(--font-body);font-size:.78rem;font-weight:700;color:var(--gold);pointer-events:none;white-space:nowrap;display:flex;align-items:center;gap:6px}.castle-icon{font-size:1rem}.castle-progress{color:var(--green);font-size:.7rem}.hud-help{position:absolute;bottom:140px;left:50%;transform:translate(-50%);font-size:.72rem;font-weight:600;color:var(--text-muted);pointer-events:none;white-space:nowrap}.modal-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#040612bf;z-index:50;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);touch-action:manipulation;-webkit-tap-highlight-color:transparent}.math-challenge{background:linear-gradient(160deg,var(--bg-card) 0%,#1a2050 100%);border:2px solid rgba(179,136,255,.35);border-radius:var(--radius-xl);padding:28px 36px;max-width:480px;width:90%;text-align:center;animation:slideIn .35s cubic-bezier(.4,0,.2,1);box-shadow:0 20px 60px #00000080,0 0 40px var(--purple-glow)}@keyframes slideIn{0%{transform:scale(.92) translateY(20px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}.math-challenge.shake{animation:shake .4s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.challenge-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.challenge-header h2{font-family:var(--font-display);font-size:1.4rem;font-weight:700}.difficulty-badge{padding:4px 12px;border-radius:20px;font-family:var(--font-display);font-size:.7rem;font-weight:600;letter-spacing:1px;text-transform:uppercase}.difficulty-badge.easy{background:var(--green);color:#000}.difficulty-badge.medium{background:var(--gold);color:#000}.difficulty-badge.hard{background:var(--coral);color:#fff}.difficulty-badge.flight{background:var(--cyan);color:#000}.challenge-header-right{display:flex;align-items:center;gap:8px}.category-badge{padding:4px 10px;border-radius:16px;font-family:var(--font-body);font-size:.72rem;font-weight:700;color:#fff}.xp-bar-mini{display:flex;align-items:center;gap:8px;margin-bottom:10px;font-size:.72rem}.xp-level{color:var(--gold);font-family:var(--font-display);font-weight:700;white-space:nowrap;text-shadow:0 0 6px var(--gold-glow)}.xp-track{flex:1;height:6px;background:#ffffff1a;border-radius:3px;overflow:hidden}.xp-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--orange));border-radius:3px;transition:width .5s ease;box-shadow:0 0 6px var(--gold-glow)}.xp-text{color:var(--text-muted);white-space:nowrap;font-weight:600}.option-btn.text-option{font-size:1rem;min-width:120px;padding:12px 16px}.challenge-progress{display:flex;align-items:center;justify-content:space-between;font-size:.82rem;font-weight:600;color:var(--text-secondary);background:var(--bg-glass-light);border:1px solid var(--border-subtle);padding:8px 14px;border-radius:var(--radius-sm);margin-bottom:8px}.challenge-total-reward{font-size:.72rem;color:var(--gold);font-weight:700}.challenge-timer-bar{position:relative;width:100%;height:26px;background:#ffffff14;border-radius:13px;margin-bottom:12px;overflow:hidden}.challenge-timer-fill{height:100%;border-radius:13px;transition:width 1s linear,background-color .5s ease}.challenge-timer-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:var(--font-display);font-size:.8rem;font-weight:600;color:#fff;text-shadow:0 1px 4px rgba(0,0,0,.6)}.challenge-question{font-family:var(--font-display);font-size:2.8rem;font-weight:700;margin:20px 0;color:var(--gold);text-shadow:0 2px 12px var(--gold-glow);filter:drop-shadow(0 0 8px rgba(255,215,64,.15))}.challenge-feedback{font-family:var(--font-display);font-size:1.2rem;font-weight:700;margin-bottom:14px;padding:8px 16px;border-radius:var(--radius-sm)}.challenge-feedback.correct{color:var(--green);background:#00e6761a;border:1px solid rgba(0,230,118,.2)}.challenge-feedback.wrong{color:var(--coral);background:#ff6b6b1a;border:1px solid rgba(255,107,107,.2)}.challenge-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:18px}.option-btn{padding:14px;font-family:var(--font-display);font-size:1.3rem;font-weight:600;border:2px solid var(--border-glow);border-radius:var(--radius-md);background:var(--bg-glass-light);color:var(--text-primary);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);touch-action:manipulation;-webkit-tap-highlight-color:transparent}.option-btn:hover:not(:disabled){background:#b388ff33;border-color:var(--purple);transform:scale(1.03);box-shadow:0 4px 20px var(--purple-glow)}.option-btn:disabled{opacity:.5;cursor:not-allowed}.option-btn.eliminated{opacity:.2;text-decoration:line-through;border-color:#ff6b6b33;background:#ff6b6b0d}.challenge-hint{background:#ffd74014;border:1px solid rgba(255,215,64,.2);border-radius:var(--radius-sm);padding:10px 14px;margin-bottom:14px;font-size:.88rem;color:var(--gold);display:flex;align-items:center;gap:8px;animation:hintAppear .3s ease-out;font-weight:600}.hint-icon{font-size:1.2rem;flex-shrink:0}@keyframes hintAppear{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.challenge-actions{display:flex;justify-content:center;gap:12px}.skip-btn,.quit-btn{padding:8px 18px;font-family:var(--font-body);font-size:.8rem;font-weight:700;border:1px solid var(--border-glow);border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);cursor:pointer;transition:all 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var(--gold-glow)}.blueprint-start-btn:hover{transform:scale(1.05)}.blueprint-start-btn:disabled{opacity:.5;cursor:not-allowed}.blueprint-progress-bar{position:absolute;top:95px;left:50%;transform:translate(-50%);background:var(--bg-glass);padding:8px 14px;border-radius:var(--radius-sm);border:1px solid rgba(68,138,255,.25);display:flex;flex-direction:column;gap:4px;font-size:.72rem;font-weight:600;color:#fff;min-width:250px;max-width:400px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.bp-header-row{display:flex;justify-content:space-between;align-items:center}.bp-progress-count{color:var(--green);font-weight:800}.bp-progress-track{height:6px;background:#ffffff14;border-radius:3px;overflow:hidden}.bp-progress-fill{height:100%;background:linear-gradient(90deg,var(--green),#69f0ae);border-radius:3px;transition:width .3s;box-shadow:0 0 8px 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