:root{--bg-primary: #0A0A0A;--bg-surface: #141414;--bg-elevated: #1E1E1E;--bg-hover: #282828;--text-primary: #F2F2F2;--text-secondary: #8A8A8A;--text-muted: #555555;--accent: #CD1719;--accent-hover: #E01B1E;--accent-light: rgba(205, 23, 25, .12);--accent-border: rgba(205, 23, 25, .4);--success: #22C55E;--success-light: rgba(34, 197, 94, .12);--error: #EF4444;--error-light: rgba(239, 68, 68, .12);--warning: #F59E0B;--border: #222222;--border-light: #2E2E2E;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "SF Mono", "Fira Code", monospace;--radius-sm: 2px;--radius-md: 3px;--radius-lg: 4px;--transition: .15s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}img{max-width:100%;height:auto}h1,h2,h3,h4{font-weight:600;line-height:1.3;color:var(--text-primary)}h1{font-size:1.75rem}h2{font-size:1.375rem}h3{font-size:1.125rem}h4{font-size:1rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.625rem 1.25rem;font-family:var(--font-sans);font-size:.9375rem;font-weight:600;line-height:1.4;border:none;border-radius:0;cursor:pointer;transition:all var(--transition);white-space:nowrap;-webkit-user-select:none;user-select:none;letter-spacing:.01em}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-light)}.btn-secondary:hover:not(:disabled){background:var(--bg-hover)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--bg-elevated);color:var(--text-primary)}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-success{background:var(--success);color:#fff}.btn-lg{padding:.875rem 1.75rem;font-size:1.0625rem}.btn-sm{padding:.375rem .75rem;font-size:.8125rem}.btn-block{width:100%}.input,.select,.textarea{width:100%;padding:.625rem .875rem;font-family:var(--font-sans);font-size:.9375rem;color:var(--text-primary);background:var(--bg-elevated);border:1px solid var(--border-light);border-radius:0;transition:border-color var(--transition),box-shadow var(--transition);outline:none}.input:focus,.select:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.input::placeholder,.textarea::placeholder{color:var(--text-muted)}.select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23A0A0A0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .75rem center;padding-right:2.5rem}.textarea{resize:vertical;min-height:80px}.form-group{margin-bottom:1rem}.form-label{display:block;margin-bottom:.375rem;font-size:.875rem;font-weight:500;color:var(--text-secondary)}.form-error{margin-top:.25rem;font-size:.8125rem;color:var(--error)}.card{background:var(--bg-surface);border:1px solid var(--border-light);border-radius:0;padding:1.5rem;border-top:2px solid var(--border-light)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.badge{display:inline-flex;align-items:center;padding:.1875rem .5rem;font-size:.6875rem;font-weight:700;border-radius:0;text-transform:uppercase;letter-spacing:.08em}.badge-easy{background:var(--success-light);color:var(--success)}.badge-medium{background:#f59e0b26;color:var(--warning)}.badge-hard{background:var(--error-light);color:var(--error)}.badge-accent{background:var(--accent-light);color:var(--accent)}.table-wrapper{overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{padding:.75rem 1rem;text-align:left;border-bottom:1px solid var(--border)}th{font-size:.8125rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}tr:hover td{background:var(--bg-elevated)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.modal{background:var(--bg-surface);border:1px solid var(--border-light);border-radius:0;border-top:2px solid var(--accent);padding:1.5rem;width:100%;max-width:560px;max-height:90vh;overflow-y:auto}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.25rem}.modal-footer{display:flex;justify-content:flex-end;gap:.75rem;margin-top:1.5rem}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 1rem}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-1{gap:.5rem}.gap-2{gap:1rem}.gap-3{gap:1.5rem}.text-center{text-align:center}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-success{color:var(--success)}.text-error{color:var(--error)}.text-accent{color:var(--accent)}.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.5rem}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}.alert{padding:.75rem 1rem;border-radius:0;font-size:.875rem;margin-bottom:1rem;border-left:3px solid currentColor}.alert-error{background:var(--error-light);color:var(--error);border:1px solid rgba(239,68,68,.3)}.alert-success{background:var(--success-light);color:var(--success);border:1px solid rgba(34,197,94,.3)}.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;gap:1rem}@media (max-width: 768px){h1{font-size:1.375rem}h2{font-size:1.125rem}.card,.modal{padding:1rem}}