:root{--primary: #3B82F6;--primary-dark: #2563EB;--secondary: #8B5CF6;--success: #10B981;--warning: #F59E0B;--danger: #DC2626;--accent: #EC4899;--teal: #14B8A6;--bg: #F8FAFC;--bg-elevated: #FFFFFF;--card: #FFFFFF;--border: #E2E8F0;--text: #0F172A;--muted: #64748B;--section-a: var(--primary);--section-b: var(--secondary);--section-c: var(--accent);--radius-card: 24px;--radius-md: 16px;--radius-sm: 10px;--radius-pill: 999px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 8px 24px rgba(15, 23, 42, .08);--shadow-lg: 0 20px 48px rgba(15, 23, 42, .12);--shadow-glow: 0 12px 32px -8px var(--section-a);--font-display: "Baloo 2", "Inter", system-ui, sans-serif;--font-body: "Inter", system-ui, -apple-system, sans-serif;--header-h: 76px;--sidebar-w: 260px;--ink: #1D4ED8;--success-ink: #047857;--danger-ink: #B91C1C;--btn-grad-from: #2563EB;--btn-grad-to: #7C3AED}[data-theme=dark]{--bg: #0B1120;--bg-elevated: #131B2E;--card: #131B2E;--border: #1E293B;--text: #F1F5F9;--muted: 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var(--btn-grad-from)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px -6px var(--btn-grad-from)}.btn-ghost{background:var(--card);color:var(--text);border:1.5px solid var(--border)}.btn-ghost:hover{border-color:var(--section-a);color:var(--ink);transform:translateY(-2px)}.btn-sm{padding:9px 16px;font-size:.85rem}.card{background:var(--card);color:var(--text);border-radius:var(--radius-card);border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:transform .25s cubic-bezier(.22,1,.36,1),box-shadow .25s ease,border-color .25s ease,background-color .25s ease}.card-hover:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}.badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--radius-pill);font-size:.78rem;font-weight:700;background:color-mix(in srgb,var(--section-a) 14%,var(--card));color:var(--ink)}@keyframes 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14px;border-radius:var(--radius-md);color:var(--muted);font-weight:600;font-size:.94rem;transition:background .18s ease,color .18s ease,transform .18s ease}.nav-link .nav-icon{font-size:1.15rem}.nav-link:hover{background:var(--bg);color:var(--text);transform:translate(2px)}.nav-link.active{background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 14%,transparent),color-mix(in srgb,var(--secondary) 14%,transparent));color:var(--primary-dark)}[data-theme=dark] .nav-link.active{color:#93c5fd}.sidebar-footer{margin-top:auto;padding-top:16px;border-top:1px solid var(--border)}.sidebar-streak{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:var(--radius-md);background:linear-gradient(135deg,#fff7ed,#fff1f2);font-size:.85rem;font-weight:700;color:#c2410c}[data-theme=dark] .sidebar-streak{background:#f59e0b1f;color:#fbbf24}.top-header{position:sticky;top:0;z-index:20;height:var(--header-h);display:flex;align-items:center;gap:20px;padding:0 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var(--border);background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;font-size:1.1rem;position:relative;transition:transform .18s ease,border-color .18s ease}.icon-btn:hover{transform:translateY(-2px);border-color:var(--primary)}.icon-btn .dot{position:absolute;top:8px;right:9px;width:8px;height:8px;border-radius:50%;background:var(--accent);border:2px solid var(--bg-elevated)}@media (max-width: 1024px){.sidebar{display:none}.top-header{padding:0 16px;gap:12px}.header-logo{display:flex}.header-search{display:none}}.mobile-nav{display:none}@media (max-width: 1024px){.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;background:color-mix(in srgb,var(--bg-elevated) 92%,transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-top:1px solid var(--border);padding:8px 6px calc(env(safe-area-inset-bottom,0px) + 8px);justify-content:space-around}.mobile-nav a{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:.68rem;font-weight:700;color:var(--muted);padding:6px 10px;border-radius:14px;transition:color .18s ease,background .18s ease}.mobile-nav a.active{color:var(--ink);background:color-mix(in srgb,var(--primary) 10%,transparent)}.mobile-nav .mnav-icon{font-size:1.25rem}}.site-footer{border-top:1px solid var(--border);padding:40px 40px 100px;margin-top:40px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;color:var(--muted);font-size:.85rem}@media (max-width: 1024px){.site-footer{padding:32px 20px 110px}}.footer-links{display:flex;gap:20px;flex-wrap:wrap}.footer-links a:hover{color:var(--ink)}@media print{.sidebar,.top-header,.site-footer,.mobile-nav,.no-print{display:none!important}.page-content{padding:0;max-width:100%}body,.app-shell{background:#fff}}.tool-shell{background:var(--card);border:1px solid 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var(--border);background:var(--bg);font-weight:700;font-size:1rem;text-align:center;transition:all .15s ease}.quiz-option:hover{border-color:var(--section-a);transform:translateY(-2px)}.quiz-option.correct{background:color-mix(in srgb,var(--success) 22%,var(--card));border-color:var(--success-ink);color:var(--success-ink)}.quiz-option.wrong{background:color-mix(in srgb,#EF4444 22%,var(--card));border-color:var(--danger-ink);color:var(--danger-ink)}.memory-card{aspect-ratio:3/4;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;cursor:pointer;position:relative;perspective:800px}.memory-card-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .4s cubic-bezier(.22,1,.36,1);border-radius:14px}.memory-card.flipped .memory-card-inner{transform:rotateY(180deg)}.memory-card-face{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:14px;display:flex;align-items:center;justify-content:center;backface-visibility:hidden}.memory-card-back{background:linear-gradient(135deg,var(--btn-grad-from),var(--btn-grad-to));color:#fff}.memory-card-front{background:var(--bg);border:2px solid var(--border);transform:rotateY(180deg);font-size:2rem}.memory-card.matched .memory-card-front{border-color:var(--success-ink);background:color-mix(in srgb,var(--success) 18%,var(--card))}.sudoku-grid{display:grid;grid-template-columns:repeat(9,1fr);gap:2px;max-width:460px;margin:0 auto;background:var(--border);border:2px solid var(--text);border-radius:8px;overflow:hidden}.sudoku-cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:var(--card);font-weight:700;font-size:clamp(.8rem,2.4vw,1.1rem);border:none;color:var(--text)}.sudoku-cell.given{color:var(--muted);background:var(--bg)}.sudoku-cell.selected{outline:3px solid var(--section-a);outline-offset:-3px;z-index:1}.sudoku-cell.conflict{color:var(--danger-ink)}.sudoku-cell:nth-child(3n){border-right:2px solid var(--text)}.sudoku-cell:nth-child(9n){border-right:none}.pad-btn{width:42px;height:42px;border-radius:10px;border:1.5px solid var(--border);background:var(--bg);font-weight:700}.pad-btn:hover{border-color:var(--section-a);color:var(--ink)}