:root{--bg:#0d1117;--panel:#161b22;--bar:#0b0f14;--line:#30363d;--text:#c9d1d9;--muted:#8b949e;--cmt:#6e7681;--kw:#ff7b72;--fn:#d2a8ff;--str:#a5d6ff;--num:#79c0ff;--acc:#3fb950;--wa:#25d366;--blue:#58a6ff}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:72px}body{margin:0;background:var(--bg);color:var(--text);font-family:Consolas,"Fira Code","Courier New",monospace;line-height:1.6;overflow-x:hidden}a{color:var(--blue);text-decoration:none}h1,h2,h3{font-family:system-ui,-apple-system,"Segoe UI",sans-serif}.wrap{max-width:1000px;margin:0 auto;padding:0 18px}#circuit{position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none;opacity:.6}.topbar{position:sticky;top:0;z-index:50;background:rgb(13 17 23 / .94);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}.bar{display:flex;align-items:center;justify-content:space-between;height:62px}.brand{color:var(--acc);font-weight:700;font-size:18px}.br{color:var(--kw)}.nav{display:flex;gap:22px}.nav a{color:var(--text);font-size:15px}.nav a::before{content:"./";color:var(--cmt)}.nav a:hover{color:var(--acc)}.nav-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);font-size:20px;padding:4px 10px;border-radius:6px;cursor:pointer}.hero{padding:64px 0 36px}.hero h1{font-size:clamp(26px,4.5vw,44px);margin:0 0 12px;color:#f0f6fc;line-height:1.2}.hero p.lead{color:var(--muted);margin:0 0 22px;font-size:17px;font-family:system-ui,sans-serif}.sec{padding:44px 0}.sec h2{font-size:28px;margin:0 0 18px;color:#f0f6fc}.sec h2 span{color:var(--acc);font-family:Consolas,monospace;font-size:20px;margin-right:8px}.cta{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 28px}.btn{display:inline-block;background:var(--acc);color:#0d1117;font-weight:700;padding:10px 18px;border-radius:8px;font-family:system-ui,sans-serif}.btn.ghost{background:#fff0;color:var(--blue);border:1px solid var(--blue)}.btn:hover{opacity:.85}.win{background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:0 12px 40px rgb(0 0 0 / .45)}.win-bar{display:flex;align-items:center;gap:7px;padding:10px 14px;background:var(--bar);border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}.win-bar b{margin-left:10px;color:var(--text);font-weight:600}.dot{width:12px;height:12px;border-radius:50%}.dot.r{background:#ff5f56}.dot.y{background:#ffbd2e}.dot.g{background:#27c93f}.code{margin:0;padding:18px 0;overflow-x:auto;font-size:15px;min-height:120px;counter-reset:ln;font-family:inherit}.line{white-space:pre-wrap;word-break:break-word;padding-right:18px;min-height:1.6em;counter-increment:ln}.line::before{content:counter(ln);display:inline-block;width:2.6em;margin-right:1.2em;text-align:right;color:var(--cmt);user-select:none}.line.active::after{content:"";display:inline-block;width:9px;height:1.1em;background:var(--acc);vertical-align:text-bottom;margin-left:1px;animation:blink 1s steps(1) infinite}@keyframes blink{50%{opacity:0}}.kw{color:var(--kw)}.fn{color:var(--fn)}.str{color:var(--str)}.num{color:var(--num)}.cmt{color:var(--cmt);font-style:italic}.footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:14px;text-align:center;background:rgb(13 17 23 / .92);margin-top:30px}.fab{position:fixed;right:18px;z-index:60;display:flex;align-items:center;gap:8px;color:#fff;border-radius:40px;padding:12px 18px;box-shadow:0 6px 20px rgb(0 0 0 / .45);font-weight:600;font-family:system-ui,sans-serif;font-size:15px;text-decoration:none}.fab.wa{bottom:22px;background:var(--wa)}.fab.call{bottom:84px;background:var(--blue);color:#0d1117;display:none}@media (max-width:768px){.nav-toggle{display:block}.nav{position:absolute;top:62px;left:0;right:0;background:var(--panel);flex-direction:column;gap:0;border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .3s}.nav.open{max-height:320px}.nav a{padding:12px 18px;border-top:1px solid var(--line)}.fab.call{display:flex}.fab span{display:none}.fab{padding:14px}.fab.wa{bottom:20px}.fab.call{bottom:80px}.line::before{width:2em;margin-right:.8em}.code{font-size:13px}.sec h2{font-size:24px}}@media (prefers-reduced-motion:reduce){#circuit{display:none}.line.active::after{animation:none}}