*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg: #2e2e52;--bg-surface: #16213e;--bg-card: #0f3460;--accent: #e94560;--accent-hover: #ff6b81;--text: #eaeaea;--text-muted: #a0a0b0;--border: #2a2a4a;--radius: 8px;--transition: .2s ease}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden}#app{min-height:100vh;display:flex;justify-content:center;align-items:flex-start;padding:2rem;transition:opacity var(--transition),transform var(--transition)}#app.page-exit{opacity:0;transform:translateY(8px)}#app.page-enter{opacity:0;transform:translateY(-8px)}.page{width:100%;max-width:800px}.home-page{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:80vh;text-align:center}.app-title{font-size:3.5rem;font-weight:800;letter-spacing:-.02em;background:linear-gradient(135deg,var(--accent),#ff9a76);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.25rem}.app-subtitle{color:var(--text-muted);font-size:1.1rem;margin-bottom:3rem}.home-buttons{display:flex;flex-direction:column;gap:1rem;width:100%;max-width:320px}.btn{padding:1rem 2rem;font-size:1.1rem;font-weight:600;border:none;border-radius:var(--radius);cursor:pointer;transition:background var(--transition),transform var(--transition),box-shadow var(--transition)}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 20px #0000004d}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-secondary{background:var(--bg-surface);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-card);border-color:var(--accent)}.btn-back{background:none;border:none;color:var(--text-muted);font-size:1rem;cursor:pointer;padding:.5rem 0;margin-bottom:1rem;transition:color var(--transition)}.btn-back:hover{color:var(--text)}.stub-page{text-align:center;padding-top:4rem}.stub-page .btn-back{position:absolute;top:2rem;left:2rem}.stub-page h1{font-size:2rem;margin-bottom:1rem}.stub-message{color:var(--text-muted);font-size:1.2rem;margin-top:1rem}.new-puzzle-page h1{font-size:2rem;margin-bottom:1.5rem}.config-section{margin-bottom:2rem}.config-section h2{font-size:1.2rem;color:var(--text-muted);margin-bottom:1rem;text-transform:uppercase;letter-spacing:.05em;font-weight:600}.image-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:1rem}.gallery-item{position:relative;border-radius:var(--radius);overflow:hidden;border:3px solid transparent;cursor:pointer;transition:border-color var(--transition),transform var(--transition),box-shadow var(--transition);background:var(--bg-surface)}.gallery-item:hover{transform:translateY(-3px);box-shadow:0 6px 24px #0000004d;border-color:var(--border)}.gallery-item.selected{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent),0 6px 24px #e945604d}.gallery-item img{width:100%;aspect-ratio:4 / 3;object-fit:cover;display:block}.gallery-label{display:block;padding:.5rem;font-size:.85rem;text-align:center;color:var(--text-muted)}.settings-grid{display:flex;flex-direction:column;gap:1rem}.setting-row{display:flex;align-items:center;justify-content:space-between;background:var(--bg-surface);padding:1rem 1.25rem;border-radius:var(--radius);border:1px solid var(--border)}.setting-row label{font-size:1rem;font-weight:500}.setting-row select{background:var(--bg-card);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);padding:.5rem .75rem;font-size:1rem;cursor:pointer;outline:none}.setting-row select:focus{border-color:var(--accent)}.toggle{position:relative;width:52px;height:28px;background:var(--border);border:none;border-radius:14px;cursor:pointer;padding:0;transition:background var(--transition)}.toggle[data-enabled=true]{background:var(--accent)}.toggle-knob{position:absolute;top:3px;left:3px;width:22px;height:22px;background:#fff;border-radius:50%;transition:transform var(--transition);pointer-events:none}.toggle[data-enabled=true] .toggle-knob{transform:translate(24px)}.start-btn{width:100%;margin-top:1rem;padding:1.1rem;font-size:1.2rem}.puzzle-page h1{font-size:2rem;margin-bottom:1.5rem}.puzzle-config-summary{display:flex;gap:1.5rem;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;margin-bottom:2rem}.config-preview img{width:160px;aspect-ratio:4 / 3;object-fit:cover;border-radius:var(--radius)}.config-details{display:flex;flex-direction:column;justify-content:center;gap:.4rem}.config-details p{font-size:.95rem;color:var(--text-muted)}.config-details strong{color:var(--text)}.puzzle-container{background:var(--bg-surface);border:2px dashed var(--border);border-radius:var(--radius);min-height:400px;display:flex;align-items:center;justify-content:center;padding:2rem}.tutorial-page h1{font-size:2rem;margin-bottom:1.5rem}.tutorial-layout{display:flex;gap:1.5rem;min-height:480px}.tutorial-nav{display:flex;flex-direction:column;gap:.25rem;min-width:220px;flex-shrink:0}.tutorial-nav-item{display:flex;align-items:center;gap:.75rem;padding:.7rem 1rem;background:none;border:1px solid transparent;border-radius:var(--radius);color:var(--text-muted);font-size:.95rem;cursor:pointer;text-align:left;transition:background var(--transition),color var(--transition),border-color var(--transition)}.tutorial-nav-item:hover{background:var(--bg-surface);color:var(--text)}.tutorial-nav-item.active{background:var(--bg-surface);border-color:var(--accent);color:var(--text)}.tutorial-nav-number{display:flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;background:var(--border);color:var(--text-muted);font-size:.75rem;font-weight:700;flex-shrink:0}.tutorial-nav-item.active .tutorial-nav-number{background:var(--accent);color:#fff}.tutorial-nav-label{white-space:nowrap}.tutorial-content{flex:1;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);padding:2rem}.tutorial-content h2{font-size:1.4rem;margin-bottom:1rem}.tutorial-content p{color:var(--text-muted);font-size:1.05rem;line-height:1.7}@media(max-width:600px){#app{padding:1rem}.app-title{font-size:2.5rem}.image-gallery{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}.puzzle-config-summary{flex-direction:column;align-items:center;text-align:center}.tutorial-layout{flex-direction:column}.tutorial-nav{min-width:unset;flex-direction:row;flex-wrap:wrap;gap:.5rem}.tutorial-nav-item{padding:.5rem .75rem;font-size:.85rem}.tutorial-nav-label{white-space:normal}}