@import "https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap";:root{--font-sans:"Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--bg-primary:#0a0b10;--bg-secondary:#121420;--bg-tertiary:#1a1d30;--border-color:#ffffff14;--border-glow:#6366f133;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--text-muted:#6b7280;--color-primary:#6366f1;--color-primary-glow:#6366f159;--color-secondary:#10b981;--color-secondary-glow:#10b98159;--color-accent:#f59e0b;--color-accent-glow:#f59e0b59;--color-danger:#ef4444;--glass-bg:#121420b3;--glass-border:#ffffff0f;--glass-shadow:#0000004d;--radius-sm:8px;--radius-md:16px;--radius-lg:24px;--radius-xl:32px;--transition-smooth:all .3s cubic-bezier(.4, 0, .2, 1);--transition-bounce:all .5s cubic-bezier(.175, .885, .32, 1.275)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;background-image:radial-gradient(at 0 0,#6366f126 0,#0000 50%),radial-gradient(at 100% 100%,#10b9811a 0,#0000 50%);min-height:100vh;line-height:1.5;overflow-x:hidden}#root{flex-direction:column;min-height:100vh;display:flex}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--bg-tertiary);border-radius:var(--radius-sm)}::-webkit-scrollbar-thumb:hover{background:var(--color-primary)}h1,h2,h3,h4,h5,h6{letter-spacing:-.02em;color:var(--text-primary);font-weight:700}.glass-card{background:var(--glass-bg);-webkit-backdrop-filter:blur(16px);border:1px solid var(--glass-border);box-shadow:0 8px 32px 0 var(--glass-shadow);border-radius:var(--radius-md);transition:var(--transition-smooth);padding:24px}.glass-card:hover{border-color:#ffffff1f;box-shadow:0 12px 40px #0006}button{font-family:var(--font-sans);cursor:pointer;transition:var(--transition-smooth);border:none;outline:none;font-weight:600}header{border-bottom:1px solid var(--border-color);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:100;background:#0a0b10cc;justify-content:space-between;align-items:center;padding:20px 40px;display:flex;position:sticky;top:0}.logo-container{align-items:center;gap:12px;display:flex}.logo-icon{background:linear-gradient(135deg, var(--color-primary), #4f46e5);border-radius:var(--radius-sm);width:40px;height:40px;box-shadow:0 0 15px var(--color-primary-glow);justify-content:center;align-items:center;font-size:20px;font-weight:800;display:flex}.logo-text h1{background:linear-gradient(135deg, var(--text-primary), var(--text-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:20px}.logo-text p{color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;font-size:11px}.nav-tabs{background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border-color);gap:4px;padding:6px;display:flex}.nav-tab{border-radius:calc(var(--radius-md) - 6px);color:var(--text-secondary);background:0 0;align-items:center;gap:8px;padding:10px 20px;font-size:14px;display:flex}.nav-tab:hover{color:var(--text-primary);background:#ffffff08}.nav-tab.active{color:#fff;background:var(--color-primary);box-shadow:0 4px 12px var(--color-primary-glow)}main{flex-direction:column;flex:1;gap:30px;width:100%;max-width:1200px;margin:0 auto;padding:40px 20px;display:flex}footer{text-align:center;border-top:1px solid var(--border-color);color:var(--text-muted);padding:24px;font-size:14px}.btn{border-radius:var(--radius-md);justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-size:15px;text-decoration:none;display:inline-flex}.btn-sm{width:40px;min-width:40px;height:40px;padding:0;font-size:18px}.btn-primary{background:var(--color-primary);color:#fff;box-shadow:0 4px 14px var(--color-primary-glow)}.btn-primary:hover{box-shadow:0 6px 20px var(--color-primary-glow);background:#4f46e5;transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:#ffffff0d;transform:translateY(-2px)}.btn-secondary:active{transform:translateY(0)}.btn-success{background:var(--color-secondary);color:#fff;box-shadow:0 4px 14px var(--color-secondary-glow)}.btn-success:hover{box-shadow:0 6px 20px var(--color-secondary-glow);background:#059669;transform:translateY(-2px)}@keyframes pulseGlow{0%,to{box-shadow:0 0 15px var(--color-primary-glow)}50%{box-shadow:0 0 25px #6366f199}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.grid-2{grid-template-columns:1fr 1fr;gap:30px;display:grid}@media (width<=900px){.grid-2{grid-template-columns:1fr}header{grid-template-rows:auto auto;grid-template-columns:1fr auto;align-items:center;gap:16px;padding:16px 20px;display:grid}.logo-container{grid-area:1/1;justify-content:flex-start}.theme-toggle-btn{grid-area:1/2;justify-self:end}.nav-tabs{grid-area:2/1/auto/span 2;justify-content:space-between;gap:4px;width:100%;padding:4px;display:flex}.nav-tab{flex:1;justify-content:center;gap:4px;padding:8px 4px;font-size:13px}.hide-mobile{display:none}main{gap:16px;padding:16px 12px}}body.light-mode{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--border-color:#0f172a14;--border-glow:#6366f11f;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--glass-bg:#ffffffd9;--glass-border:#0f172a0f;--glass-shadow:#0f172a0a;--color-primary-glow:#6366f126;--color-secondary-glow:#10b98126;--finger-inactive-start:#cbd5e1;--finger-inactive-end:#94a3b8;--bead-inactive-start:#cbd5e1;--bead-inactive-end:#94a3b8;background-image:radial-gradient(at 0 0,#6366f10f 0,#0000 50%),radial-gradient(at 100% 100%,#10b9810a 0,#0000 50%)}body.light-mode header{background:#fffc;border-bottom:1px solid #0f172a14}body.light-mode .btn-secondary{background:var(--bg-tertiary);color:var(--text-primary)}body.light-mode .btn-secondary:hover{background:#0000000a}body.light-mode .nav-tab.active,body.light-mode .toggle-btn.active{color:var(--color-primary);box-shadow:none;background:#6366f11f}body.light-mode .level-card.active{border-color:var(--color-primary);color:var(--color-primary);box-shadow:none;background:#6366f11f}.theme-toggle-btn{background:var(--bg-secondary);width:40px;height:40px;color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:var(--transition-smooth);justify-content:center;align-items:center;font-size:18px;display:flex;box-shadow:0 2px 8px #0000001a}.theme-toggle-btn:hover{background:var(--bg-tertiary);border-color:var(--text-secondary);transform:translateY(-1px)}.theme-toggle-btn:active{transform:translateY(0)}body.light-mode .feedback-alert.correct{color:#065f46;background:#10b9811f;border-color:#10b9814d}body.light-mode .feedback-alert.incorrect{color:#991b1b;background:#ef44441f;border-color:#ef44444d}body.light-mode .keypad-btn:hover:not(:disabled){background:#0000000a}body.light-mode .nav-tab:hover{background:#00000008}body.light-mode .toggle-btn:hover{color:var(--text-primary)}@media (width<=900px) and (orientation:landscape){header.practice-mode-header{justify-content:space-between;align-items:center;gap:8px;height:46px;padding:4px 12px;display:flex}header.practice-mode-header .logo-container,header.practice-mode-header .nav-tabs{display:none!important}header.practice-mode-header .theme-toggle-btn{width:32px;min-width:32px;height:32px;margin-left:auto;font-size:14px}header.practice-mode-header .header-practice-controls{flex:1;justify-content:center;align-items:center;display:flex;overflow:hidden}}.soroban-container{flex-direction:column;align-items:center;width:100%;max-width:680px;margin:0 auto;display:flex}.soroban-controls{justify-content:space-between;align-items:center;width:100%;margin-bottom:16px;display:flex}.soroban-display-value{color:var(--text-secondary);font-size:18px;font-weight:600}.highlight-text{color:var(--color-primary);text-shadow:0 0 10px 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