*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f1117;--bg2: #1a1d2e;--bg3: #252840;--border: #2e3150;--text: #e8eaf6;--text2: #8891b8;--accent: #6366f1;--accent2: #818cf8;--green: #10b981;--red: #ef4444;--yellow: #f59e0b;--gold: #fbbf24;--silver: #94a3b8;--bronze: #b45309;--easy: #10b981;--medium: #f59e0b;--hard: #ef4444}html,body{height:100%}body{font-family:Inter,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}#root{min-height:100vh;display:flex;flex-direction:column}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg2)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--accent)}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:8px;border:none;font-size:14px;font-weight:600;cursor:pointer;transition:all .15s;font-family:inherit}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent2);transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--text2);border:1px solid var(--border)}.btn-ghost:hover:not(:disabled){background:var(--bg3);color:var(--text)}.btn-success{background:var(--green);color:#fff}.btn-success:hover:not(:disabled){filter:brightness(1.1)}.btn-danger{background:var(--red);color:#fff}.btn-danger:hover:not(:disabled){filter:brightness(1.1)}.btn-sm{padding:5px 10px;font-size:12px}.card{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:20px}.badge{display:inline-block;padding:2px 8px;border-radius:20px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.badge-easy{background:#10b98122;color:var(--easy)}.badge-medium{background:#f59e0b22;color:var(--medium)}.badge-hard{background:#ef444422;color:var(--hard)}.badge-accepted{background:#10b98122;color:var(--green)}.badge-wrong_answer{background:#ef444422;color:var(--red)}.badge-error{background:#f59e0b22;color:var(--yellow)}.badge-pending{background:#6366f122;color:var(--accent)}input,select,textarea{background:var(--bg3);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:9px 12px;font-size:14px;font-family:inherit;outline:none;transition:border-color .15s}input:focus,select:focus,textarea:focus{border-color:var(--accent)}label{font-size:13px;font-weight:600;color:var(--text2);display:block;margin-bottom:6px}.form-group{margin-bottom:16px}.form-group input,.form-group select,.form-group textarea{width:100%}h1{font-size:28px;font-weight:700}h2{font-size:22px;font-weight:700}h3{font-size:16px;font-weight:600}.prose h2{font-size:18px;margin:0 0 12px;color:var(--text)}.prose h3{font-size:14px;margin:16px 0 8px;color:var(--text2);text-transform:uppercase;letter-spacing:.5px}.prose p{color:var(--text2);margin:0 0 12px;font-size:14px}.prose code{background:var(--bg3);padding:1px 6px;border-radius:4px;font-family:JetBrains Mono,monospace;font-size:12px;color:var(--accent2)}.prose table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13px}.prose th{background:var(--bg3);padding:8px 12px;text-align:left;color:var(--text2);border:1px solid var(--border)}.prose td{padding:8px 12px;border:1px solid var(--border);color:var(--text)}.prose ul{padding-left:20px;color:var(--text2);font-size:14px}.prose li{margin-bottom:4px}.toast{position:fixed;bottom:24px;right:24px;z-index:9999;padding:12px 20px;border-radius:10px;font-size:14px;font-weight:600;animation:slideUp .3s ease;display:flex;align-items:center;gap:8px;max-width:400px}.toast-success{background:#10b981;color:#fff}.toast-error{background:#ef4444;color:#fff}.toast-info{background:var(--accent);color:#fff}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}