:root{color-scheme:dark;--bg:#0b1117;--panel:#121d27;--panel2:#192632;--ink:#eef3f5;--muted:#a9b9c2;--line:#2b3c49;--accent:#7dd3c7;--gold:#ffd084;--link:#99d9ff;--max:1180px}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 50% -20%,#17343d 0,transparent 55%),var(--bg);color:var(--ink);font:17px/1.68 system-ui,-apple-system,'Segoe UI',sans-serif}a{color:var(--link);text-underline-offset:3px}a:hover{color:#d6f2ff}.wrap{width:min(var(--max),calc(100% - 36px));margin:auto}.topbar{border-bottom:1px solid var(--line);background:#0b1117ee}.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:66px}.brand{font-weight:750;letter-spacing:.02em;color:var(--ink);text-decoration:none}.navlinks{display:flex;gap:18px;flex-wrap:wrap}.navlinks a{font-size:.93rem}.hero{padding:52px 0 34px}.eyebrow{color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.12em;font-size:.78rem}.hero h1{font-size:clamp(2.1rem,5vw,4.2rem);line-height:1.08;max-width:850px;margin:.5rem 0 1rem}.hero p{max-width:800px;color:var(--muted);font-size:1.12rem}.pill{display:inline-flex;padding:5px 11px;border:1px solid #40616a;border-radius:99px;color:var(--accent);font-size:.86rem}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.card{display:flex;flex-direction:column;padding:21px;border:1px solid var(--line);border-radius:17px;background:linear-gradient(145deg,var(--panel2),var(--panel));min-height:220px}.card h2{font-size:1.12rem;line-height:1.35;margin:.25rem 0 .65rem}.card p{color:var(--muted);margin:.25rem 0 1rem}.card .meta{font-size:.82rem;color:var(--accent);font-weight:700}.card .go{margin-top:auto;font-weight:700}.notice{border:1px solid #52634a;background:#1b2a20;border-radius:14px;padding:15px 18px;color:#d8ebcd;margin:22px 0}.section{padding:24px 0 48px}.section h2{font-size:1.6rem}.layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start;padding:28px 0 58px}.article{min-width:0;padding:clamp(20px,4vw,46px);background:var(--panel);border:1px solid var(--line);border-radius:18px}.article h1{font-size:clamp(1.8rem,4vw,3rem);line-height:1.15}.article h2{margin:2.1em 0 .5em;font-size:1.55rem;line-height:1.25}.article h3{margin:1.7em 0 .45em;font-size:1.22rem}.article p,.article li{color:#d9e2e6}.article strong{color:#fff}.article code{padding:.12em .38em;border-radius:5px;background:#091017;color:#bceadf;font-size:.92em}.article pre{white-space:pre-wrap;overflow-wrap:anywhere;padding:16px;border:1px solid var(--line);border-radius:10px;background:#081017}.table-wrap{overflow-x:auto;margin:18px 0}.table-wrap table{border-collapse:collapse;width:100%;min-width:560px;font-size:.93rem}.table-wrap th,.table-wrap td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}.table-wrap th{background:#1b303a;color:var(--accent)}blockquote{margin:18px 0;padding:12px 18px;border-left:4px solid var(--gold);background:#211e17;color:#f3e5c4}hr{border:0;border-top:1px solid var(--line);margin:28px 0}.side{position:sticky;top:18px;display:grid;gap:12px}.sidebox{padding:17px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}.sidebox h2{font-size:1rem;margin:0 0 10px}.sidebox a{display:block;padding:5px 0;color:var(--muted);font-size:.9rem}.sidebox .active{color:var(--accent);font-weight:700}.demo{margin:24px 0;padding:18px;border:1px solid #3a6868;border-radius:14px;background:#102125}.demo h2{margin:0 0 8px}.demo iframe{display:block;width:100%;height:760px;border:1px solid var(--line);border-radius:12px;background:#0b1117}.demo a{font-weight:700}.lesson-nav{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:22px 0}.lesson-nav a{padding:10px 13px;border:1px solid var(--line);border-radius:10px;text-decoration:none}.footer{border-top:1px solid var(--line);padding:28px 0 42px;color:var(--muted);font-size:.9rem}.empty-state{color:var(--muted);padding:8px 0}@media(max-width:850px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.layout{grid-template-columns:1fr}.side{position:static;order:-1;grid-template-columns:1fr}.demo iframe{height:680px}}@media(max-width:580px){body{font-size:16px}.wrap{width:min(var(--max),calc(100% - 24px))}.topbar .wrap{align-items:flex-start;padding:12px 0;flex-direction:column}.hero{padding:34px 0 22px}.grid{grid-template-columns:1fr}.card{min-height:0}.article{padding:19px 15px}.demo{padding:12px}.demo iframe{height:620px}.navlinks{gap:12px}}