:root{--bg-primary: #090d16;--bg-main: #090d16;--bg-card: #111827;--bg-card-hover: #1f293d;--bg-surface: #1e293b;--border-color: rgba(255, 255, 255, .08);--border-focus: #3b82f6;--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--accent-primary: #3b82f6;--accent-primary-hover: #2563eb;--hold-start: #10b981;--hold-start-glow: rgba(16, 185, 129, .4);--hold-hand-foot: #3b82f6;--hold-hand-foot-glow: rgba(59, 130, 246, .4);--hold-foot-only: #f59e0b;--hold-foot-only-glow: rgba(245, 158, 11, .4);--hold-top: #ef4444;--hold-top-glow: rgba(239, 68, 68, .4);--hold-catalog: rgba(255, 255, 255, .35);--font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "Outfit", sans-serif;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, .6)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{font-family:var(--font-family);background-color:var(--bg-main);color:var(--text-primary);min-height:100vh;line-height:1.5;overflow-x:hidden;touch-action:manipulation}h1,h2,h3,h4,.brand-title{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em}.app-header{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:.75rem 1.5rem;background:#0b0f19d9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color)}.brand{display:flex;align-items:center;gap:.6rem;font-size:1.25rem;font-weight:800;color:var(--text-primary);text-decoration:none}.brand-icon{color:var(--accent-primary)}.main-container{max-width:1300px;margin:0 auto;padding:1.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.6rem 1.1rem;font-size:.875rem;font-weight:600;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all .15s ease;-webkit-user-select:none;user-select:none}.btn-primary{background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;box-shadow:0 4px 12px #2563eb4d}.btn-primary:hover{filter:brightness(1.1);transform:translateY(-1px)}.btn-secondary{background:var(--bg-surface);color:var(--text-primary);border-color:var(--border-color)}.btn-secondary:hover{background:var(--bg-card-hover)}.btn-outline{background:transparent;color:var(--text-primary);border-color:var(--border-color)}.btn-outline:hover{background:#ffffff0d}.btn-sm{padding:.4rem .75rem;font-size:.75rem}.btn-danger{background:#ef444426;color:#ef4444;border-color:#ef44444d}.btn-danger:hover{background:#ef4444;color:#fff}.grade-badge{display:inline-flex;align-items:center;justify-content:center;padding:.2rem .6rem;border-radius:var(--radius-sm);font-family:var(--font-display);font-weight:700;font-size:.875rem;background:#3b82f626;color:#60a5fa;border:1px solid rgba(59,130,246,.3)}.grade-badge-sm{font-size:.75rem;padding:.15rem .45rem}.dual-range-input{position:absolute;width:100%;pointer-events:none;-moz-appearance:none;appearance:none;-webkit-appearance:none;background:none;margin:0;outline:none}.dual-range-input::-webkit-slider-thumb{pointer-events:auto;-moz-appearance:none;appearance:none;-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#38bdf8;border:3px solid #0f172a;box-shadow:0 0 10px #38bdf8cc,0 2px 4px #00000080;cursor:pointer;transition:transform .1s ease}.dual-range-input::-moz-range-thumb{pointer-events:auto;width:22px;height:22px;border-radius:50%;background:#38bdf8;border:3px solid #0f172a;box-shadow:0 0 10px #38bdf8cc,0 2px 4px #00000080;cursor:pointer}.dual-range-input::-webkit-slider-thumb:active{transform:scale(1.2)}.style-filter-btn{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:8px;padding:.35rem .55rem;display:inline-flex;align-items:center;gap:.3rem;font-size:.75rem;color:var(--text-secondary);cursor:pointer;transition:all .15s ease}.style-filter-btn:hover{background:var(--bg-card-hover);color:var(--text-primary)}.style-filter-btn.active{background:#38bdf833;border-color:#38bdf8;color:#38bdf8;font-weight:700;box-shadow:0 0 8px #38bdf84d}.wall-canvas-wrapper{position:relative;width:100%;height:100%;border-radius:var(--radius-lg);overflow:hidden;background:#05070c;border:1px solid var(--border-color);touch-action:none;box-shadow:var(--shadow-lg)}.wall-image-layer{display:block;width:100%;height:100%;object-fit:contain;-webkit-user-select:none;user-select:none;pointer-events:none;image-rendering:-webkit-optimize-contrast;image-rendering:high-quality}.wall-svg-overlay{position:absolute;top:0;left:0;width:100%;height:100%;cursor:crosshair}.hold-circle{transition:all .15s ease;cursor:pointer}.hold-circle:hover{filter:drop-shadow(0 0 8px currentColor);transform-origin:center}.hold-start{fill:var(--hold-start);filter:drop-shadow(0 0 6px var(--hold-start-glow))}.hold-hand-foot{fill:var(--hold-hand-foot);filter:drop-shadow(0 0 6px var(--hold-hand-foot-glow))}.hold-foot-only{fill:var(--hold-foot-only);filter:drop-shadow(0 0 6px var(--hold-foot-only-glow))}.hold-top{fill:var(--hold-top);filter:drop-shadow(0 0 6px var(--hold-top-glow))}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.25rem;margin-top:1rem}.problem-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:1rem;transition:transform .2s ease,border-color .2s ease;cursor:pointer;display:flex;flex-direction:column;justify-content:space-between}.problem-card:hover{transform:translateY(-2px);border-color:#3b82f666;background:var(--bg-card-hover)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#000c;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;padding:1rem;animation:fadeIn .15s ease-out}.modal-content{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);max-width:600px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);padding:1.5rem}@keyframes fadeIn{0%{opacity:0;transform:scale(.98)}to{opacity:1;transform:scale(1)}}.form-group{margin-bottom:1.1rem}.form-label{display:block;font-size:.825rem;font-weight:600;color:var(--text-secondary);margin-bottom:.4rem;text-transform:uppercase;letter-spacing:.05em}.form-input,.form-select,.form-textarea{width:100%;background:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-primary);border-radius:var(--radius-md);padding:.65rem .9rem;font-size:.925rem;font-family:inherit;outline:none;transition:border-color .15s ease}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--accent-primary)}.chips-container{display:flex;flex-wrap:wrap;gap:.4rem}.grade-chip{padding:.35rem .7rem;font-size:.8rem;font-weight:600;border-radius:var(--radius-sm);background:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;transition:all .12s ease}.grade-chip.active{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary)}