.sidebar-inner[data-astro-cid-ssfzsv2f]{padding:.75rem 0}.sidebar-inner[data-astro-cid-ssfzsv2f] a[data-astro-cid-ssfzsv2f]{color:var(--text);display:block;padding:.25rem 1.5rem;font-size:.82rem;border-left:2px solid transparent}.sidebar-inner[data-astro-cid-ssfzsv2f] a[data-astro-cid-ssfzsv2f]:hover{background:var(--bg-hover);text-decoration:none}.sidebar-inner[data-astro-cid-ssfzsv2f] a[data-astro-cid-ssfzsv2f].active{background:var(--accent-light);border-left-color:var(--accent);color:var(--accent);font-weight:500}.mod-name[data-astro-cid-ssfzsv2f]{padding:.5rem 1rem .15rem;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-secondary);margin-top:.25rem}details[data-astro-cid-ssfzsv2f]{border-left:2px solid transparent}details[data-astro-cid-ssfzsv2f].active{border-left-color:var(--accent)}summary[data-astro-cid-ssfzsv2f]{cursor:pointer;padding:.3rem 1rem;font-size:.78rem;font-weight:600;color:var(--text-secondary);user-select:none;list-style:none;display:flex;align-items:center;gap:.3rem}summary[data-astro-cid-ssfzsv2f]::-webkit-details-marker{display:none}summary[data-astro-cid-ssfzsv2f]:before{content:"▶";font-size:.6rem;transition:transform .15s;color:var(--text-muted)}details[data-astro-cid-ssfzsv2f][open]>summary[data-astro-cid-ssfzsv2f]:before{content:"▶";transform:rotate(90deg)}summary[data-astro-cid-ssfzsv2f]:hover{background:var(--bg-hover)}.lesson-nav[data-astro-cid-dafctdak]{display:flex;justify-content:space-between;margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);gap:1rem}.lesson-nav[data-astro-cid-dafctdak] a[data-astro-cid-dafctdak]{padding:.5rem 1rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;max-width:45%;transition:background .15s;color:var(--text)}.lesson-nav[data-astro-cid-dafctdak] a[data-astro-cid-dafctdak]:hover{background:var(--bg-hover);text-decoration:none;color:var(--accent)}.nav-label[data-astro-cid-dafctdak]{font-size:.75rem;color:var(--text-muted);display:block;margin-bottom:.15rem}.nav-arrow[data-astro-cid-dafctdak]{font-size:.75rem}.nav-spacer[data-astro-cid-dafctdak]{padding:.5rem 1rem;max-width:45%}@media(max-width:768px){.lesson-nav[data-astro-cid-dafctdak]{flex-direction:column}.lesson-nav[data-astro-cid-dafctdak] a[data-astro-cid-dafctdak],.nav-spacer[data-astro-cid-dafctdak]{max-width:100%}}:root{--bg: #ffffff;--bg-secondary: #f8f9fa;--bg-hover: #e9ecef;--text: #212529;--text-secondary: #6c757d;--text-muted: #adb5bd;--border: #dee2e6;--accent: #4361ee;--accent-hover: #3a56d4;--accent-light: #eef0ff;--code-bg: #f1f3f5;--code-text: #343a40;--sidebar-width: 280px;--header-height: 56px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;--font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;--content-width: 800px;--astro-code-background: #ffffff;--astro-code-foreground: #24292e;--astro-code-token-constant: #0550ae;--astro-code-token-string: #0a3069;--astro-code-token-comment: #6e7781;--astro-code-token-keyword: #cf222e;--astro-code-token-parameter: #24292e;--astro-code-token-function: #8250df;--astro-code-token-string-expression: #0a3069;--astro-code-token-punctuation: #24292e;--astro-code-token-link: #0550ae}[data-theme=dark]{--bg: #0d1117;--bg-secondary: #161b22;--bg-hover: #21262d;--text: #e6edf3;--text-secondary: #8b949e;--text-muted: #484f58;--border: #30363d;--accent: #58a6ff;--accent-hover: #79c0ff;--accent-light: #0d1117;--code-bg: #161b22;--code-text: #e6edf3;--astro-code-background: #161b22;--astro-code-foreground: #e1e4e8;--astro-code-token-constant: #79c0ff;--astro-code-token-string: #a5d6ff;--astro-code-token-comment: #8b949e;--astro-code-token-keyword: #ff7b72;--astro-code-token-parameter: #e1e4e8;--astro-code-token-function: #d2a8ff;--astro-code-token-string-expression: #a5d6ff;--astro-code-token-punctuation: #e1e4e8;--astro-code-token-link: #79c0ff}*{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover);text-decoration:underline}code,pre{font-family:var(--font-mono);font-size:.875em}code{background:var(--code-bg);color:var(--code-text);padding:.15em .35em;border-radius:4px}pre{background:var(--code-bg);padding:1rem;border-radius:8px;overflow-x:auto;margin:1.25rem 0;border:1px solid var(--border)}pre code{background:none;padding:0}img{max-width:100%;height:auto}blockquote{border-left:3px solid var(--accent);padding:.5rem 1rem;margin:1.25rem 0;background:var(--bg-secondary);border-radius:0 8px 8px 0;color:var(--text-secondary)}table{width:100%;border-collapse:collapse;margin:1.25rem 0;font-size:.9rem}th,td{border:1px solid var(--border);padding:.5rem .75rem;text-align:left}th{background:var(--bg-secondary);font-weight:600}tr:nth-child(2n){background:var(--bg-secondary)}h1{font-size:1.75rem;margin:0 0 .25rem;line-height:1.3}h2{font-size:1.35rem;margin:1.75rem 0 .75rem;color:var(--accent);line-height:1.3}h3{font-size:1.15rem;margin:1.5rem 0 .5rem;line-height:1.3}h4,h5,h6{font-size:1rem;margin:1.25rem 0 .5rem}p{margin:.75rem 0}ul,ol{margin:.75rem 0;padding-left:1.5rem}li{margin:.35rem 0}hr{border:none;border-top:1px solid var(--border);margin:1.5rem 0}strong{font-weight:600}.layout{display:flex;min-height:calc(100vh - var(--header-height))}.sidebar{width:var(--sidebar-width);flex-shrink:0;border-right:1px solid var(--border);background:var(--bg-secondary);overflow-y:auto;position:sticky;top:var(--header-height);height:calc(100vh - var(--header-height))}.content{flex:1;padding:2rem 2.5rem;max-width:var(--content-width)}.content-wide{max-width:1000px}.header{height:var(--header-height);display:flex;align-items:center;padding:0 1rem;border-bottom:1px solid var(--border);background:var(--bg);position:sticky;top:0;z-index:100;gap:.75rem}.header-title{font-size:1rem;font-weight:600;color:var(--text);white-space:nowrap}.header-title:hover{text-decoration:none;color:var(--accent)}.header-spacer{flex:1}.header-badge{font-size:.7rem;background:var(--accent-light);color:var(--accent);padding:.15rem .5rem;border-radius:999px;border:1px solid var(--accent);white-space:nowrap}.theme-toggle{background:none;border:1px solid var(--border);border-radius:6px;padding:.35rem .6rem;cursor:pointer;font-size:1rem;line-height:1;color:var(--text)}.theme-toggle:hover{background:var(--bg-hover)}.menu-toggle{display:none;background:none;border:1px solid var(--border);border-radius:6px;padding:.35rem .6rem;cursor:pointer;font-size:1rem;color:var(--text)}.lesson-meta{font-size:.85rem;color:var(--text-secondary);margin-bottom:1.25rem;padding-bottom:1rem;border-bottom:1px solid var(--border)}.lesson-meta span{display:inline-block}.lesson-meta .sep{margin:0 .5rem;color:var(--text-muted)}.lesson-nav{display:flex;justify-content:space-between;margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);gap:1rem}.lesson-nav a{padding:.5rem 1rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;max-width:45%;transition:background .15s}.lesson-nav a:hover{background:var(--bg-hover);text-decoration:none}.lesson-nav .nav-label{font-size:.75rem;color:var(--text-muted);display:block;margin-bottom:.15rem}.lesson-nav .nav-disabled{padding:.5rem 1rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;color:var(--text-muted);opacity:.4}details.solution-toggle{margin:1rem 0;border:1px solid var(--border);border-radius:8px;overflow:hidden}details.solution-toggle summary{padding:.6rem 1rem;background:var(--bg-secondary);cursor:pointer;font-weight:500;font-size:.9rem;user-select:none}details.solution-toggle summary:hover{background:var(--bg-hover)}details.solution-toggle .content{padding:1rem;max-width:100%}@media(max-width:768px){.sidebar{position:fixed;top:var(--header-height);left:0;width:100%;height:calc(100vh - var(--header-height));z-index:99;transform:translate(-100%);transition:transform .25s}.sidebar.open{transform:translate(0)}.content{padding:1.25rem}.menu-toggle{display:block}.lesson-nav{flex-direction:column}.lesson-nav a,.lesson-nav .nav-disabled{max-width:100%}}