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#ccc;text-align:center;padding:10px;box-sizing:border-box;overflow:hidden;text-overflow:ellipsis}.shape-rectangle{width:100%;height:100%}.shape-circle{width:100%;height:100%;border-radius:50%}.shape-triangle{width:0;height:0;border-left:50%;border-right:50%;border-bottom:100%;border-left-color:transparent;border-right-color:transparent;margin:0 auto}.empty-canvas-message{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:#888;background-color:#fffc;padding:20px;border-radius:8px}.builder-footer{margin-top:1rem;padding:10px;border-top:1px solid #eee}.help-text{font-size:13px;color:#777;text-align:center}.header-left{display:flex;flex-direction:column;align-items:flex-start}.back-link{margin-top:.5rem;color:#3498db;text-decoration:none;display:flex;align-items:center;font-size:14px}.back-link:hover{text-decoration:underline}@media (max-width: 768px){.builder-container{padding:.5rem}.toolbar{flex-direction:column;align-items:stretch;padding:8px}.toolbar-group{justify-content:center;padding:5px 0;border-bottom:1px solid #ddd;flex-wrap:wrap}.toolbar button,.button-like{padding:6px 10px;font-size:13px}.builder-header{flex-direction:column;gap:10px;align-items:flex-start}.builder-header h2{font-size:1.4rem}.canvas{min-height:50vh}.element-controls{top:-25px}.element-controls button,.color-picker{width:22px;height:22px}.builder-footer{padding:8px}.help-text{font-size:11px}}@media (max-width: 480px){.toolbar button,.button-like{padding:5px 8px;font-size:12px}.icon{font-size:14px}.builder-header h2{font-size:1.3rem}.style-controls{flex-wrap:wrap}}.clock-container{position:fixed;top:0;right:0;width:150px;height:150px;z-index:1000;padding:10px;margin:10px}.theme-toggle{position:sticky;top:20px;left:20px;z-index:1200;background:none;border:2px solid var(--border-color, 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2px);transform:translateY(-50%);width:24px;height:24px;border-radius:50%;background-color:var(--thumb-bg, #ffffff);display:flex;align-items:center;justify-content:center;font-size:12px;transition:all .3s ease;box-shadow:0 2px 4px #0003}[data-theme=light] .theme-toggle{--border-color: #e2e8f0;--border-hover: #cbd5e1;--toggle-bg: rgba(255, 255, 255, .8);--thumb-bg: #ffffff;--thumb-position: 2px;--focus-ring: rgba(59, 130, 246, .5)}[data-theme=dark] .theme-toggle{--border-color: #374151;--border-hover: #4b5563;--toggle-bg: rgba(55, 65, 81, .8);--thumb-bg: #1f2937;--thumb-position: 36px;--focus-ring: rgba(147, 197, 253, .5)}.theme-toggle-thumb{transition:left .3s cubic-bezier(.4,0,.2,1)}@media (max-width: 768px){.theme-toggle{top:10px;left:10px;width:56px;height:28px}.theme-toggle-thumb{width:20px;height:20px;font-size:10px}[data-theme=dark] .theme-toggle{--thumb-position: 32px}}@media (max-width: 480px){.theme-toggle{top:5px;left:5px;width:48px;height:24px}.theme-toggle-thumb{width:18px;height:18px;font-size:9px}[data-theme=dark] .theme-toggle{--thumb-position: 26px}}.gh-left{position:fixed;top:8px;left:8px;display:flex;align-items:center;gap:8px;z-index:900}.gh-right{position:fixed;top:8px;right:8px;display:flex;align-items:center;z-index:900}.gh-flag{display:inline-flex;align-items:center}.gh-flag img{width:50px;height:auto;display:block}.gh-home-center{position:fixed;top:24px;left:50%;transform:translate(-50%);z-index:1201;pointer-events:auto}@media (max-width:768px){.gh-left{top:6px;left:6px}.gh-right{top:6px;right:6px}.gh-flag img{width:40px}.gh-home-center{top:6px}}.img_flag{position:fixed;top:0;left:0;width:50px;height:65px;z-index:1000}.img_flag img{width:100%;height:100%;display:block}.practice-main{background:var(--bg-secondary);border-radius:24px;box-shadow:var(--shadow-xl);padding:2.75rem 3.5rem 3.5rem;margin:1.5rem 0 3rem;transition:all .35s cubic-bezier(.165,.84,.44,1);position:relative;color:var(--text-primary);border:1px solid var(--border-color);overflow:hidden;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.practice-main:before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(to right,var(--accent-primary),var(--accent-secondary),var(--accent-primary));background-size:200% 100%;animation:gradient-shift 8s ease infinite}@keyframes gradient-shift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.practice-main:hover{box-shadow:var(--shadow-2xl);transform:translateY(-3px)}.question-header{display:flex;align-items:center;margin-bottom:2rem;border-bottom:1px solid var(--border-color);padding-bottom:1.25rem;position:relative}.question-header:after{content:"";position:absolute;bottom:-1px;left:0;width:150px;height:3px;background:linear-gradient(to 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992px){.sidebar{width:100vw;min-width:0;height:auto;max-height:none;box-shadow:none;border-radius:0 0 16px 16px;background:#fff}.sidebar-header{padding:1.25rem 1rem .75rem}.sidebar-header h2{font-size:1.15rem}.questions-list{min-height:40vh;max-height:480px;padding:.5rem .5rem 1rem;height:auto}.question-item{padding:.75rem .8rem;font-size:.98rem;min-height:44px;margin-bottom:.5rem;border-radius:8px}}@media (max-width: 600px){.sidebar{width:100vw;min-width:0;height:auto;max-height:none;border-radius:0 0 12px 12px;box-shadow:none;padding-bottom:.5rem}.questions-list{min-height:30vh;max-height:60vh;height:auto;padding:.25rem .25rem .5rem}.question-item{font-size:.96rem;min-height:40px;padding:.6rem;border-radius:7px}}.js-practice-container{display:flex;flex-direction:row;min-height:90vh;max-width:1600px;width:100%;margin:32px auto 0;padding:0;box-sizing:border-box;font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;color:var(--text-primary);background:var(--bg-secondary);border-radius:16px;overflow:hidden;position:relative;z-index:2;box-shadow:0 10px 30px #0000001f,0 4px 8px #0000000f;border:1px solid var(--border-color);transition:all .3s ease;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}@media (min-width: 769px){.js-practice-container{flex-direction:row;min-height:90vh;max-width:1400px}.js-practice-main{flex:1 1 auto;min-width:0;padding:2rem 2.5rem;overflow-y:auto;position:relative;background:var(--bg-primary);scrollbar-width:thin;scrollbar-color:var(--accent-primary) var(--bg-tertiary)}.js-practice-main::-webkit-scrollbar{width:8px}.js-practice-main::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:4px}.js-practice-main::-webkit-scrollbar-thumb{background-color:var(--accent-primary);border-radius:4px}}@media (min-width: 992px){.js-practice-container{position:relative}.sidebar{width:var(--sidebar-width, 420px);min-width:280px}.split-resizer{width:6px;cursor:col-resize;background:linear-gradient(180deg,transparent,var(--border-color),transparent)}}@media (min-width: 1200px){.js-practice-container{min-height:90vh;max-width:1600px;width:100%;margin-top:32px;border-radius:16px;box-shadow:0 12px 36px #00000026,0 4px 10px #00000014;background:var(--bg-secondary);box-sizing:border-box;overflow:hidden}.js-practice-main{flex:1 1 auto;min-width:0;padding:2.5rem 3.5rem;overflow-y:auto;position:relative;background:var(--bg-primary);scrollbar-width:thin;scrollbar-color:var(--accent-primary) var(--bg-tertiary)}.js-practice-main::-webkit-scrollbar{width:8px}.js-practice-main::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:4px}.js-practice-main::-webkit-scrollbar-thumb{background-color:var(--accent-primary);border-radius:4px}}@media (max-width: 768px){.js-practice-container{flex-direction:column;min-height:auto;border-radius:12px;margin-top:16px;padding:0}.js-practice-main{padding:1.25rem 1.5rem}}.back-link{position:sticky;top:0;display:flex;justify-content:flex-end;padding-top:.5rem;z-index:5}.back-link a{display:flex;align-items:center;padding:8px 14px;background:var(--accent-primary);color:var(--bg-primary);text-decoration:none;border-radius:6px;font-size:14px;font-weight:500;transition:all .2s ease;border:1px solid var(--accent-primary)}.back-link a:hover{background:var(--accent-secondary);border-color:var(--accent-secondary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.back-link a:before{content:"←";margin-right:6px;font-size:16px}.search-container{margin:40px 0 1.5rem}.search-input{width:100%;padding:12px 16px;font-size:1rem;border:1px solid #dee2e6;border-radius:6px;box-shadow:0 2px 5px #0000000d;transition:all .2s ease-in-out}.search-input:focus{border-color:#4dabf7;outline:0;box-shadow:0 0 0 3px #4dabf740}.search-input::placeholder{color:#adb5bd}.empty-state{display:flex;flex-direction:column;height:70vh;justify-content:center;align-items:center;font-size:1.25rem;color:#6c757d;border:2px dashed #dee2e6;border-radius:8px;background-color:#fff;padding:2rem;text-align:center}.empty-state:before{content:"👨‍💻";font-size:3rem;margin-bottom:1rem}.sidebar-handle{position:sticky;top:50%;transform:translateY(-50%);left:0;z-index:30;width:14px;height:64px;margin-left:0;padding:0;border:none;background:linear-gradient(180deg,var(--bg-tertiary),var(--bg-primary));border-right:1px solid var(--border-color);border-top-right-radius:8px;border-bottom-right-radius:8px;box-shadow:var(--shadow-sm);cursor:pointer;color:var(--text-secondary)}.sidebar-handle .chev{display:block;writing-mode:vertical-rl;transform:rotate(180deg);font-size:10px;letter-spacing:2px}.sidebar-handle:hover{filter:brightness(1.05)}.js-practice-container.sidebar-collapsed .sidebar{display:none!important}.js-practice-container.sidebar-collapsed .js-practice-main{padding:1.25rem 2rem}@media (max-width: 992px){.js-practice-container{flex-direction:column;height:auto;min-height:calc(100vh - 40px);overflow:visible;padding:8px 0 16px;border-radius:10px}.js-practice-main{padding:.5rem .5rem 1rem;overflow-y:visible;border-radius:10px}.sidebar-handle{top:8px;transform:none;height:40px}}@media (max-width: 768px){.js-practice-container{flex-direction:column;padding:0 0 8px;border-radius:8px}.js-practice-main{padding:.5rem .2rem;border-radius:8px}.search-container{margin-top:10px}.sidebar-handle{display:block;position:sticky;top:8px}}.js-practice-container.layout-topbar{flex-direction:column}.layout-topbar .topbar-row{position:sticky;top:0;z-index:15;background:var(--bg-secondary);border-bottom:1px solid var(--border-color)}.layout-topbar .js-practice-main{padding-top:1rem}html,body{margin:0;padding:0;width:100%;height:100%;overflow-x:hidden;background-color:#111;color:#fff}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}#root{width:100%;min-height:100vh;position:relative;z-index:1;background-color:transparent}@media (max-width: 768px){#root{padding:1rem}h1{font-size:1.8rem}h2{font-size:1.5rem}}@media (max-width: 480px){#root{padding:.5rem}h1{font-size:1.5rem}h2{font-size:1.3rem}}