:root{--bg:#0a0a0b;--bg-2:#111113;--surface:#161618;--surface-2:#1c1c1f;--ink:#f5f5f7;--ink-2:#dadbe0;--ink-3:#9ea0a7;--ink-4:#74767d;--ink-5:#45464c;--accent:#7aa6d9;--accent-2:#9bc0e8;--accent-deep:#4f7aae;--accent-bg:rgba(122,166,217,0.10);--accent-border:rgba(122,166,217,0.25);--line:rgba(255,255,255,0.07);--ease:cubic-bezier(.22,.61,.36,1)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{background:var(--bg);color:var(--ink);font-family:'Inter',system-ui,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{line-height:1.65;min-height:100vh;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.mono{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace}
.skip-link{position:absolute;left:-9999px;top:12px;z-index:100;background:var(--accent);color:#0a0a0b;padding:9px 14px;border-radius:8px;font-weight:600;font-size:13px}
.skip-link:focus{left:12px}
nav{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(10,10,11,0.82);backdrop-filter:blur(16px) saturate(160%);-webkit-backdrop-filter:blur(16px) saturate(160%);border-bottom:1px solid var(--line)}
.nav-inner{max-width:720px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.logo{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:500;color:var(--ink);text-decoration:none}
.logo-mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,#2a3342,#4f7aae 60%,#7aa6d9);color:#fff;display:grid;place-items:center;font-weight:600;font-size:12px;letter-spacing:-0.02em;box-shadow:0 4px 14px rgba(79,122,174,0.4),inset 0 1px 0 rgba(255,255,255,0.18);transition:transform .3s var(--ease)}
.logo:hover .logo-mark{transform:rotate(-8deg) scale(1.05)}
.nav-right{display:flex;align-items:center;gap:8px}
.lang-toggle{display:flex;gap:2px;background:rgba(255,255,255,0.04);border-radius:8px;padding:3px;border:1px solid var(--line)}
.lang-toggle button{background:transparent;border:none;padding:5px 10px;font-size:11px;font-weight:500;cursor:pointer;border-radius:5px;font-family:'JetBrains Mono',monospace;color:var(--ink-3);transition:all .2s var(--ease)}
.lang-toggle button.active{background:var(--accent);color:#0a0a0b}
.back-link{font-size:13px;color:var(--ink-3);transition:color .2s}
.back-link:hover{color:var(--accent)}
.article-wrap{max-width:720px;margin:0 auto;padding:100px 24px 80px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:24px}
.tag{display:inline-block;padding:4px 10px;font-size:11px;font-weight:500;font-family:'JetBrains Mono',monospace;border-radius:6px;background:var(--accent-bg);color:var(--accent);border:1px solid var(--accent-border);letter-spacing:0.02em}
.date,.reading-time{font-size:13px;color:var(--ink-4);font-family:'JetBrains Mono',monospace}
.dot-sep{color:var(--ink-5)}
h1{font-size:clamp(28px,5vw,42px);font-weight:700;letter-spacing:-0.03em;line-height:1.15;color:var(--ink);margin-bottom:16px}
.subtitle{font-size:17px;color:var(--ink-3);line-height:1.55;margin-bottom:32px}
.author-row{display:flex;align-items:center;gap:10px;padding-bottom:32px;margin-bottom:40px;border-bottom:1px solid var(--line)}
.author-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#2a3342,#4f7aae 60%,#7aa6d9);display:grid;place-items:center;font-size:12px;font-weight:600;color:#fff}
.author-info{font-size:13px;line-height:1.4}
.author-info strong{color:var(--ink);font-weight:500}
.author-info span{display:block;color:var(--ink-4);font-family:'JetBrains Mono',monospace;font-size:11px}
article h2{font-size:22px;font-weight:600;letter-spacing:-0.02em;color:var(--ink);margin:40px 0 16px}
article p{font-size:16px;color:var(--ink-2);margin-bottom:20px;line-height:1.7}
article strong{color:var(--ink);font-weight:600}
article code{font-family:'JetBrains Mono',monospace;font-size:14px;background:var(--surface);padding:2px 6px;border-radius:4px;color:var(--accent)}
article a{color:var(--accent-2);text-decoration:underline;text-decoration-color:var(--accent-border);text-underline-offset:3px;text-decoration-thickness:1px;transition:color .2s var(--ease),text-decoration-color .2s var(--ease)}
article a:hover{color:var(--accent);text-decoration-color:var(--accent)}
article ul,article ol{margin:0 0 20px;padding-left:24px;color:var(--ink-2)}
article li{font-size:16px;line-height:1.7;margin-bottom:6px}
article table{width:100%;border-collapse:collapse;margin:0 0 24px;font-size:14px;background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden}
article table th,article table td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);color:var(--ink-2);vertical-align:top}
article table th{background:var(--surface-2);color:var(--ink);font-weight:500;font-size:12px;letter-spacing:0.04em;text-transform:uppercase;font-family:'JetBrains Mono',monospace}
article table tr:last-child td{border-bottom:none}
article table tr:hover td{background:rgba(122,166,217,0.03)}
article table td code{background:transparent;padding:0;font-size:13px}
article .calc-box{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin:0 0 24px;font-family:'JetBrains Mono',monospace;font-size:14px;color:var(--ink-2);line-height:1.85}
article .calc-box .label{color:var(--ink-4);font-size:11px;text-transform:uppercase;letter-spacing:0.06em;margin-bottom:8px;display:block}
article .calc-box .calc-row{display:flex;justify-content:space-between;padding:4px 0;border-bottom:1px dashed var(--line)}
article .calc-box .calc-row:last-of-type{border-bottom:none}
article .calc-box .calc-total{display:flex;justify-content:space-between;padding-top:10px;margin-top:6px;border-top:1px solid var(--accent-border);color:var(--accent-2);font-weight:600}
article details{background:var(--surface);border:1px solid var(--line);border-radius:8px;margin-bottom:8px;overflow:hidden;transition:border-color .2s var(--ease)}
article details[open]{border-color:var(--accent-border)}
article details summary{cursor:pointer;padding:14px 18px;color:var(--ink);font-weight:500;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center;user-select:none}
article details summary::-webkit-details-marker{display:none}
article details summary::after{content:"+";color:var(--accent-2);font-size:18px;font-weight:300;transition:transform .2s var(--ease)}
article details[open] summary::after{transform:rotate(45deg)}
article details summary:hover{color:var(--accent)}
article details > *:not(summary){padding:0 18px 16px}
article details p{margin:0;color:var(--ink-3);font-size:15px}
article details > ol,article details > ul{padding:0 18px 16px 44px;margin:0;list-style-position:outside}
article details ol li,article details ul li{font-size:15px;color:var(--ink-3);margin-bottom:8px;line-height:1.6}
article pre{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin:0 0 24px;overflow-x:auto;font-family:'JetBrains Mono',monospace;font-size:13px;line-height:1.55;color:var(--ink-2)}
article pre code{background:transparent;padding:0;border-radius:0;color:inherit;font-size:inherit;display:block;white-space:pre}
article pre .code-label{display:block;color:var(--ink-4);font-size:11px;text-transform:uppercase;letter-spacing:0.06em;margin-bottom:8px;font-family:'JetBrains Mono',monospace}
.note-more{margin-top:56px;padding-top:28px;border-top:1px solid var(--line)}
.note-more h2{font-size:14px;font-weight:500;letter-spacing:0.08em;text-transform:uppercase;color:var(--ink-4);margin:0 0 16px}
.note-more .related{list-style:none;padding:0;display:grid;gap:10px;margin:0 0 24px}
.note-more .related a{display:block;padding:14px 16px;border-radius:10px;background:var(--surface);border:1px solid var(--line);color:var(--ink-2);font-size:14px;line-height:1.4;transition:all .2s ease;text-decoration:none}
.note-more .related a:hover{border-color:var(--accent-border);color:var(--ink);background:rgba(122,166,217,0.04);transform:translateY(-1px)}
.note-more .related a strong{display:block;color:var(--ink);font-weight:500;margin-bottom:2px}
.note-more .related a span{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:0.04em;color:var(--ink-4);text-transform:uppercase}
.note-cta{margin:0;padding:16px 20px;border-radius:10px;background:linear-gradient(135deg,rgba(122,166,217,0.08),rgba(122,166,217,0.02));border:1px solid var(--accent-border);font-size:14px;color:var(--ink-2)}
.note-cta a{color:var(--accent-2);font-weight:500;text-decoration:none}
.note-cta a:hover{color:var(--accent)}
.archive-wrap{max-width:960px}
.archive-section{margin-top:42px}
.archive-section h2{font-size:14px;font-weight:500;letter-spacing:0.08em;text-transform:uppercase;color:var(--ink-4);margin:0 0 14px}
.archive-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.archive-card{display:flex;flex-direction:column;gap:9px;min-height:210px;padding:18px;border-radius:10px;background:var(--surface);border:1px solid var(--line);transition:transform .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease)}
.archive-card:hover{transform:translateY(-2px);border-color:var(--accent-border);background:rgba(122,166,217,0.04)}
.archive-card .archive-meta{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:0.04em;text-transform:uppercase;color:var(--ink-4)}
.archive-card strong{font-size:16px;line-height:1.35;font-weight:600;color:var(--ink)}
.archive-card span:last-child{font-size:14px;line-height:1.55;color:var(--ink-3)}
@media(max-width:800px){.archive-grid{grid-template-columns:1fr}.archive-card{min-height:0}}
@media(max-width:480px){.article-wrap{padding:88px 18px 60px}.nav-inner{padding:12px 18px}}