.problem-view .problem-header{margin-bottom:2.5rem;padding-bottom:1.5rem;border-bottom:1px solid var(--color-border)}.problem-view .problem-title{margin:0 0 1rem;font-size:2.2rem;font-weight:800;color:var(--color-text);display:flex;align-items:center;gap:.8rem;flex-wrap:wrap}.problem-view .problem-id-label{color:var(--color-btn-1-bg);font-family:JetBrains Mono,monospace;font-weight:800;font-size:1.8rem;padding-right:.5rem;position:relative}.problem-view .problem-id-label:empty{display:none}.problem-view .problem-id-label:after{content:"";position:absolute;right:-4px;top:25%;height:50%;width:2px;background:var(--color-border)}.problem-view .problem-tier-badge{font-size:1.1rem;padding:.3rem .8rem;border-radius:8px;font-weight:800;box-shadow:0 2px 6px #00000026}.problem-view .problem-meta{display:flex;gap:1rem;flex-wrap:wrap}.problem-view .meta-badge{display:flex;align-items:center;gap:.4rem;background:var(--color-surface);color:var(--color-text-muted);font-size:.9rem;font-weight:600;padding:.4rem .8rem;border-radius:8px;border:1px solid var(--color-border)}.problem-view .examples-section{margin-top:3rem;padding-top:2rem;border-top:1px dashed var(--color-border)}.problem-view .examples-title{font-size:1.6rem;font-weight:800;margin-bottom:2rem;color:var(--color-text)}.problem-view .example-row{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-bottom:2rem}.problem-view .example-box{display:flex;flex-direction:column;gap:.6rem}.problem-view .example-label{font-size:.95rem;font-weight:700;color:var(--color-text-muted);padding-left:.2rem}.problem-view .example-code{margin:0!important}.problem-view .source-section{margin-top:3rem;padding-top:2rem;border-top:1px dashed var(--color-border)}.problem-view .source-title{font-size:1.6rem;font-weight:800;margin-bottom:1rem;color:var(--color-text)}.problem-view .source-path{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:.95rem}.problem-view .source-part{background:var(--color-surface);color:var(--color-text);padding:.35rem .75rem;border-radius:6px;border:1px solid var(--color-border);font-weight:600}.problem-view .source-sep{color:var(--color-text-muted);font-weight:700}.problem-view .markdown-body h2{color:var(--color-text);margin-top:2.5rem;margin-bottom:1rem;font-weight:800;font-size:1.4rem;display:flex;align-items:center;letter-spacing:-.01em}.problem-view .markdown-body h2:before{content:"";display:inline-block;width:5px;height:1.2rem;background:var(--color-btn-1-bg);margin-right:.6rem;border-radius:4px}.problem-view .markdown-body p{color:var(--color-text);font-size:1.05rem;line-height:1.7;margin-bottom:1.5rem}.problem-view .markdown-body p code,.problem-view .markdown-body li code{background:var(--color-surface);color:var(--color-btn-1-bg);padding:.2rem .4rem;border-radius:6px;font-size:.9em;font-weight:600;border:1px solid var(--color-border)}.problem-view .clean-code-wrapper{position:relative;display:flex;background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;margin-bottom:2rem;overflow:hidden}.problem-view .clean-gutter{display:flex;flex-direction:column;padding:1rem .5rem;background:#00000008;border-right:1px solid var(--color-border);color:var(--color-text-muted);font-family:JetBrains Mono,Consolas,monospace;font-size:.9rem;line-height:1.5;text-align:right;user-select:none;min-width:2.5rem}:root[data-theme=dark] .problem-view .clean-gutter{background:#ffffff05}.problem-view .clean-code-wrapper pre{margin:0!important;padding:1rem 1.2rem!important;background:transparent!important;border-radius:0!important;border:none!important;flex:1;overflow-x:auto}.problem-view .clean-code-wrapper code{font-family:JetBrains Mono,Consolas,monospace;font-size:.9rem;color:var(--color-text);line-height:1.5}.problem-view .clean-copy-btn{position:absolute;top:.5rem;right:.5rem;background:var(--color-surface);border:1px solid var(--color-border);color:var(--color-text-muted);padding:.4rem;border-radius:6px;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px #0000000d;transition:all .2s}.problem-view .clean-copy-btn:hover{background:var(--color-border);color:var(--color-text)}.problem-view .clean-copy-btn.copied{color:#4ade80;border-color:#4ade80}