.app-bar{position:fixed;top:0;left:0;right:0;height:3.5rem;background:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 1rem;box-shadow:var(--shadow-lg);z-index:100}.menu-btn{width:2.5rem;height:2.5rem;border:none;background:transparent;color:#fff;font-size:1.5rem;cursor:pointer;border-radius:.5rem;transition:background .2s;display:flex;align-items:center;justify-content:center}.menu-btn:hover{background:#ffffff1a}.menu-btn:active{background:#fff3}.step-nav{display:flex;align-items:center;gap:.75rem}.nav-btn{width:2.5rem;height:2.5rem;border:none;background:#fff3;color:#fff;border-radius:.5rem;font-size:1rem;cursor:pointer;transition:all 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.toc-item-content:hover{background:#e5e7eb}.toc-item.level-0{margin-left:0}.toc-item.level-1{margin-left:1.5rem}.toc-item.level-2{margin-left:3rem}.toc-item.level-3{margin-left:4.5rem}.expand-toggle{width:2rem;height:2rem;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:transparent;border:none;color:var(--text-secondary);cursor:pointer;font-size:.75rem;border-radius:.25rem;transition:all .2s;margin-top:.5rem}.expand-toggle:hover{background:var(--bg-light);color:var(--text-primary)}.toc-item-content{flex:1;padding:.875rem 1rem;background:#fff;border-radius:.5rem;cursor:pointer;transition:all .2s;box-shadow:0 1px 3px #0000001a;display:flex;align-items:center;justify-content:space-between;gap:.75rem;border:2px solid transparent}.toc-item-content:hover{background:#f9fafb;box-shadow:0 2px 6px #00000026;transform:translateY(-1px)}.toc-item-content:active{transform:translateY(0);box-shadow:0 1px 3px 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.nav-item-title{color:var(--success-color);font-weight:700}.check-mark{font-size:1.25rem;color:var(--success-color);flex-shrink:0;margin-left:.5rem}.nav-footer-buttons{display:flex;flex-direction:column;gap:.75rem;margin:1rem;flex-shrink:0}.reload-button{padding:.875rem;border:none;background:var(--primary-color);color:#fff;border-radius:.5rem;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s;touch-action:manipulation}.reload-button:hover{background:#2563eb}.reload-button:active{transform:scale(.98)}.reset-button{padding:.875rem;border:none;background:#ef4444;color:#fff;border-radius:.5rem;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s;touch-action:manipulation}.reset-button:hover{background:#dc2626}.reset-button:active{transform:scale(.98)}.app{height:100%;width:100%;overflow:hidden;position:relative;display:flex;flex-direction:column}.app-main{margin-top:3.5rem;height:calc(100% - 3.5rem);overflow:hidden;display:flex;flex-direction:column}.loading{height:100%;width:100%;display:flex;align-items:center;justify-content:center;background:var(--bg-primary)}.loading-content{text-align:center;max-width:24rem;padding:2rem}.loading-spinner{width:4rem;height:4rem;margin:0 auto 1.5rem;border:4px solid var(--bg-light);border-top:4px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-content h2{margin:0 0 1.5rem;color:var(--text-primary);font-size:1.5rem;font-weight:600}.loading-progress-bar{width:100%;height:.5rem;background:var(--bg-light);border-radius:.25rem;overflow:hidden;margin-bottom:.75rem}.loading-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color) 0%,#2563eb 100%);transition:width .3s ease-out;border-radius:.25rem}.loading-text{margin:0;color:var(--text-secondary);font-size:.875rem;font-weight:500}*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #2563eb;--primary-dark: #1e40af;--success-color: #22c55e;--text-primary: #1f2937;--text-secondary: #6b7280;--bg-light: #f9fafb;--bg-white: #ffffff;--border-color: #e5e7eb;--shadow: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica 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