:root{--bg:#2D2A2E;--bg-light:#383539;--bg-lighter:#403E41;--fg:#FCFCFA;--fg-dim:#939293;--blue:#78DCE8;--green:#A9DC76;--red:#FF6188;--yellow:#FFD866;--purple:#AB9DF2;--orange:#FC9867;--pink:#FF6188}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,'Segoe UI',sans-serif;background:var(--bg);color:var(--fg);line-height:1.8;font-size:15.5px;max-width:860px;margin:0 auto;padding:2rem 1.5rem 5rem}

a{color:var(--blue);text-decoration:none;transition:color .15s}
a:hover{color:var(--purple);text-decoration:underline}

h1{color:var(--blue);font-size:2.3rem;margin-bottom:.2rem;line-height:1.2}
h2{color:var(--green);font-size:1.3rem;margin:2rem 0 .5rem;padding-bottom:.3rem;border-bottom:2px solid var(--bg-lighter)}
h3{color:var(--yellow);font-size:1.05rem;margin:1.5rem 0 .4rem}
h4{color:var(--purple);font-size:.95rem;margin:1rem 0 .3rem}

p{margin-bottom:.6rem;color:var(--fg)}
.subtitle{color:var(--fg-dim);font-size:1rem;margin-bottom:2rem;border-left:3px solid var(--blue);padding-left:1rem}

.site-header{margin-bottom:2rem}
.site-header h1{font-size:2.5rem}
.site-header .subtitle{font-size:1rem;margin-bottom:1rem}
.header-meta{display:flex;gap:1rem;flex-wrap:wrap;margin-top:.5rem}
.header-meta span{color:var(--fg-dim);font-size:.85rem;background:var(--bg-light);padding:.2rem .6rem;border-radius:4px}

.table-of-contents{border:1px solid var(--bg-lighter);border-radius:12px;padding:1.5rem 2rem;margin:2rem 0;background:var(--bg-light)}
.table-of-contents h2{color:var(--yellow);font-size:1.1rem;text-transform:uppercase;letter-spacing:2px;margin-bottom:1rem;border:none}
.table-of-contents ul{list-style:none}
.table-of-contents li{margin-bottom:.35rem}
.table-of-contents .toc-part{margin-top:.6rem}
.table-of-contents .toc-part a{color:var(--green);font-weight:700;font-size:.9rem}
.table-of-contents .toc-part a:hover{color:var(--yellow)}
.table-of-contents .toc-week{padding-left:1.2rem}
.table-of-contents .toc-week a{color:var(--fg-dim);font-size:.83rem}
.table-of-contents .toc-week a:hover{color:var(--blue)}
.table-of-contents .toc-capstone{padding-left:1.2rem}
.table-of-contents .toc-capstone a{color:var(--orange);font-size:.83rem}

.nav-links{display:flex;justify-content:space-between;margin:2.5rem 0 1rem;padding-top:1rem;border-top:1px solid var(--bg-lighter)}
.nav-links a{background:var(--bg-light);padding:.5rem 1rem;border-radius:6px;font-size:.85rem;border:1px solid var(--bg-lighter);transition:all .15s}
.nav-links a:hover{background:var(--bg-lighter);border-color:var(--blue);text-decoration:none}
.nav-links .next{margin-left:auto}

.section{padding:1rem 1.2rem;margin:1rem 0;background:var(--bg-light);border-radius:8px;border-left:3px solid var(--blue)}
.section h3{margin:0 0 .5rem}
.section p{color:var(--fg);font-size:.92rem;margin-bottom:.4rem}
.section ul{margin:.3rem 0 .3rem 1.2rem}
.section li{color:var(--fg-dim);font-size:.87rem;margin-bottom:.25rem}
.section .key{color:var(--yellow);font-weight:600}
.section .code{color:var(--green);font-family:'JetBrains Mono','Fira Code',monospace;font-size:.82rem;background:var(--bg);padding:.1rem .4rem;border-radius:3px}

.exercise{margin:.6rem 0;padding:.6rem .8rem;background:var(--bg);border-radius:6px;border-left:3px solid var(--orange)}
.exercise strong{color:var(--orange);font-size:.83rem}
.exercise p{color:var(--fg-dim);font-size:.83rem}

pre{background:var(--bg);border:1px solid var(--bg-lighter);border-radius:6px;padding:.8rem 1rem;margin:.5rem 0;overflow-x:auto;font-size:.82rem;line-height:1.5;color:var(--green);font-family:'JetBrains Mono','Fira Code',monospace}
pre .comment{color:var(--fg-dim);font-style:italic}
pre .keyword{color:var(--purple)}
pre .string{color:var(--yellow)}
pre .number{color:var(--orange)}
pre .builtin{color:var(--red)}
pre .operator{color:var(--fg)}
pre .function{color:var(--blue)}
pre .constant{color:var(--pink)}

code{color:var(--green);font-family:'JetBrains Mono',monospace;font-size:.85rem;background:var(--bg);padding:.1rem .4rem;border-radius:3px}

table{width:100%;border-collapse:collapse;margin:.6rem 0;font-size:.88rem}
th{background:var(--bg-lighter);color:var(--yellow);text-align:left;padding:.5rem .6rem;border:1px solid var(--bg-lighter)}
td{padding:.4rem .6rem;border:1px solid var(--bg-lighter);color:var(--fg-dim)}
tr:nth-child(even){background:var(--bg-light)}

blockquote{margin:.6rem 0;padding:.5rem 1rem;border-left:3px solid var(--purple);background:var(--bg-light);border-radius:0 6px 6px 0;color:var(--fg-dim);font-size:.88rem}

.badge{display:inline-block;font-size:.65rem;padding:.1rem .45rem;border-radius:4px;margin-left:.5rem;font-weight:600;text-transform:uppercase;vertical-align:middle}
.badge-beginner{background:#2d6a4f;color:#A9DC76}
.badge-intermediate{background:#7b2d8e;color:#AB9DF2}
.badge-advanced{background:#9b2226;color:#FC9867}

.footer{text-align:center;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--bg-lighter);color:var(--fg-dim);font-size:.8rem}

@media(max-width:600px){body{padding:1rem .8rem}.table-of-contents{padding:1rem}}