:root{--color-bg: #0a0c10;--color-surface: #111318;--color-surface-2: #191c24;--color-border: #252830;--color-border-bright: #353a48;--color-red: #e5281e;--color-red-dim: #9b1a14;--color-red-glow: rgba(229, 40, 30, .25);--color-teal: #00d4d4;--color-teal-dim: #007e8a;--color-teal-glow: rgba(0, 212, 212, .2);--color-text: #e8eaf0;--color-text-muted: #7c8499;--color-text-dim: #4a5068;--color-success: #22c55e;--color-warning: #f59e0b;--color-danger: #ef4444;--font-display: "Rajdhani", sans-serif;--font-body: "Inter", sans-serif;--font-mono: "JetBrains Mono", monospace;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-red: 0 0 20px var(--color-red-glow), 0 0 40px rgba(229,40,30,.1);--shadow-teal: 0 0 20px var(--color-teal-glow), 0 0 40px rgba(0,212,212,.1);--shadow-card: 0 4px 24px rgba(0,0,0,.4)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{background-color:var(--color-bg);color:var(--color-text);font-family:var(--font-body);line-height:1.6;min-height:100vh;background-image:radial-gradient(ellipse at 20% 0%,rgba(229,40,30,.06) 0%,transparent 50%),radial-gradient(ellipse at 80% 100%,rgba(0,212,212,.04) 0%,transparent 50%)}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;letter-spacing:.02em;line-height:1.2}h1{font-size:clamp(2rem,4vw,3rem)}h2{font-size:clamp(1.5rem,3vw,2.25rem)}h3{font-size:clamp(1.25rem,2vw,1.75rem)}code,pre,.mono{font-family:var(--font-mono)}a{color:var(--color-teal);text-decoration:none}a:hover{text-decoration:underline}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--color-surface)}::-webkit-scrollbar-thumb{background:var(--color-border-bright);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--color-teal-dim)}.text-red{color:var(--color-red)}.text-teal{color:var(--color-teal)}.text-muted{color:var(--color-text-muted)}.text-dim{color:var(--color-text-dim)}.font-display{font-family:var(--font-display)}.font-mono{font-family:var(--font-mono)}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-card)}.card-hover{transition:border-color .2s,transform .2s,box-shadow .2s;cursor:pointer}.card-hover:hover{border-color:var(--color-teal-dim);transform:translateY(-2px);box-shadow:var(--shadow-card),0 0 20px var(--color-teal-glow)}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.25rem;border-radius:var(--radius-md);font-family:var(--font-display);font-size:1rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;cursor:pointer;border:none;transition:all .2s}.btn-primary{background:var(--color-red);color:#fff}.btn-primary:hover{background:#f03020;box-shadow:var(--shadow-red)}.btn-secondary{background:transparent;border:1px solid var(--color-teal-dim);color:var(--color-teal)}.btn-secondary:hover{background:var(--color-teal-glow);border-color:var(--color-teal)}.btn-ghost{background:transparent;color:var(--color-text-muted);border:1px solid var(--color-border)}.btn-ghost:hover{color:var(--color-text);border-color:var(--color-border-bright)}.btn-danger{background:transparent;border:1px solid var(--color-danger);color:var(--color-danger)}.btn-danger:hover{background:#ef44441a}.btn:disabled{opacity:.4;cursor:not-allowed}.form-group{display:flex;flex-direction:column;gap:.4rem}.form-label{font-family:var(--font-display);font-size:.85rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted)}.form-input{background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:.65rem .9rem;font-family:var(--font-body);font-size:.95rem;color:var(--color-text);outline:none;transition:border-color .2s,box-shadow .2s;width:100%}.form-input:focus{border-color:var(--color-teal-dim);box-shadow:0 0 0 3px var(--color-teal-glow)}.form-input::placeholder{color:var(--color-text-dim)}.badge{display:inline-flex;align-items:center;gap:.25rem;padding:.2rem .6rem;border-radius:100px;font-size:.75rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;font-family:var(--font-display)}.badge-red{background:#e5281e26;color:#ff5a50;border:1px solid rgba(229,40,30,.3)}.badge-teal{background:#00d4d41f;color:var(--color-teal);border:1px solid rgba(0,212,212,.25)}.badge-green{background:#22c55e1f;color:#4ade80;border:1px solid rgba(34,197,94,.25)}.badge-gray{background:#ffffff0d;color:var(--color-text-muted);border:1px solid var(--color-border)}.tag{display:inline-flex;padding:.15rem .55rem;background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:.7rem;color:var(--color-text-muted);text-transform:lowercase}.alert{padding:.75rem 1rem;border-radius:var(--radius-md);font-size:.9rem;border-left:3px solid}.alert-error{background:#ef44441a;border-color:var(--color-danger);color:#fca5a5}.alert-success{background:#22c55e1a;border-color:var(--color-success);color:#86efac}.alert-info{background:#00d4d414;border-color:var(--color-teal);color:var(--color-teal)}.divider{width:100%;height:1px;background:var(--color-border);margin:1.5rem 0}.spinner{width:20px;height:20px;border:2px solid var(--color-border);border-top-color:var(--color-teal);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.page-enter{animation:fadeUp .3s ease forwards}@keyframes fadeUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.glow-red{box-shadow:var(--shadow-red)}.glow-teal{box-shadow:var(--shadow-teal)}.solved-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#22c55e0a;border-radius:inherit;pointer-events:none}.rank-1{color:gold}.rank-2{color:silver}.rank-3{color:#cd7f32}