@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap";:root{--bg-main:#0a0d16;--bg-card:#161c2db3;--bg-code:#0f1322;--border-color:#ffffff14;--border-glow:#6366f126;--color-primary:#6366f1;--color-primary-hover:#4f46e5;--color-secondary:#06b6d4;--color-success:#10b981;--color-error:#ef4444;--color-warning:#f59e0b;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--text-muted:#6b7280;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", monospace;--transition-smooth:all .3s cubic-bezier(.4, 0, .2, 1);--shadow-glow:0 0 20px #6366f126}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-primary);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;background-image:radial-gradient(at 0 0,#6366f11a 0,#0000 50%),radial-gradient(at 100% 100%,#06b6d414 0,#0000 50%);background-attachment:fixed;min-height:100vh;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-main)}::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-primary)}.card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-color);transition:var(--transition-smooth);border-radius:16px;padding:24px;box-shadow:0 8px 32px #0000005e}.card:hover{box-shadow:var(--shadow-glow);border-color:#6366f14d}.title-glow{background:linear-gradient(135deg,#fff 30%,#a5b4fc 100%);-webkit-text-fill-color:transparent;text-shadow:0 0 30px #6366f133;-webkit-background-clip:text;font-size:2.5rem;font-weight:700}.container{max-width:1200px;margin:0 auto;padding:24px}.header-nav{border-bottom:1px solid var(--border-color);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;background:#0a0d16cc;justify-content:space-between;align-items:center;padding:16px 24px;display:flex;position:sticky;top:0}.btn{cursor:pointer;transition:var(--transition-smooth);font-size:.95rem;font-weight:600;font-family:var(--font-sans);border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:12px 24px;display:inline-flex}.btn-primary{background:var(--color-primary);color:#fff;box-shadow:0 4px 14px #6366f166}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover);transform:translateY(-2px);box-shadow:0 6px 20px #6366f199}.btn-secondary{color:var(--text-primary);border-color:var(--border-color);background:#ffffff0d}.btn-secondary:hover:not(:disabled){border-color:var(--color-primary);background:#ffffff1a}.btn:disabled{opacity:.5;cursor:not-allowed}.code-container{background:var(--bg-code);border:1px solid var(--border-color);font-family:var(--font-mono);color:#cbd5e1;border-radius:10px;padding:20px;font-size:.9rem;line-height:1.6;position:relative;overflow-x:auto}.code-badge{text-transform:uppercase;color:var(--text-secondary);border:1px solid var(--border-color);background:#ffffff0f;border-radius:4px;padding:4px 8px;font-size:.75rem;position:absolute;top:8px;right:8px}.option-btn{border:1px solid var(--border-color);width:100%;color:var(--text-primary);text-align:left;cursor:pointer;transition:var(--transition-smooth);background:#ffffff08;border-radius:12px;align-items:center;gap:12px;padding:16px 20px;font-size:1rem;display:flex}.option-btn:hover:not(.checked){background:#6366f114;border-color:#6366f180;transform:translate(4px)}.option-btn.correct{box-shadow:0 0 15px #10b9811a;border-color:var(--color-success)!important;background:#10b98126!important}.option-btn.incorrect{box-shadow:0 0 15px #ef44441a;border-color:var(--color-error)!important;background:#ef444426!important}.option-btn.missed{background:#10b9810d;border-color:var(--color-success)!important}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.shake-animation{animation:.3s ease-in-out shake}.slide-up-panel{animation:.4s cubic-bezier(.16,1,.3,1) slideUp}.progress-ring-container{justify-content:center;align-items:center;display:inline-flex;position:relative}.tag{border:1px solid #0000;border-radius:9999px;align-items:center;padding:4px 10px;font-size:.75rem;font-weight:500;display:inline-flex}.tag-standard{color:var(--color-secondary);background:#06b6d41a;border-color:#06b6d433}.tag-category{color:var(--color-primary);background:#6366f11a;border-color:#6366f133}.tag-difficulty{color:var(--color-warning);background:#f59e0b1a;border-color:#f59e0b33}input[type=range]{-webkit-appearance:none;background:#ffffff1a;border-radius:3px;outline:none;width:100%;height:6px}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--color-primary);cursor:pointer;border-radius:50%;width:18px;height:18px;transition:transform .1s}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2)}.code-comment{color:#6b7280;font-style:italic}.code-keyword{color:#f43f5e;font-weight:700}.code-type{color:#3b82f6}.code-string{color:#10b981}.code-number{color:#f59e0b}