:root{--bg:#0f172a;--card-bg:#1e293b;--text:#e2e8f0;--text-muted:#94a3b8;--accent:#60a5fa;--accent-hover:#3b82f6;--border:#334155;--radius:12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;padding:24px;-webkit-text-size-adjust:100%}.container{max-width:800px;margin:0 auto;padding:40px 0}h1{font-size:2rem;margin-bottom:8px;color:#fff}h2{font-size:1.3rem;margin-top:32px;margin-bottom:12px;color:var(--accent)}h3{font-size:1.1rem;margin-top:24px;margin-bottom:8px;color:#cbd5e1}li,p{color:var(--text-muted);margin-bottom:8px}ol,ul{padding-left:20px;margin-bottom:16px}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover);text-decoration:underline}.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:24px}.meta{color:var(--text-muted);font-size:.9rem;margin-bottom:24px}.back-link{display:inline-block;color:var(--accent);text-decoration:none;font-size:.95rem}.back-link:hover{text-decoration:underline}.footer{margin-top:48px;padding-top:24px;border-top:1px solid var(--border);text-align:center;color:var(--text-muted);font-size:.85rem}.header-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;flex-wrap:wrap;gap:12px}.language-selector{position:relative;display:inline-block}.language-selector__btn{background:var(--card-bg);border:1px solid var(--border);color:var(--text);padding:6px 12px;border-radius:8px;cursor:pointer;font-size:.9rem;display:flex;align-items:center;gap:6px;white-space:nowrap}.language-selector__btn:hover{border-color:var(--accent)}.language-selector__dropdown{position:absolute;top:100%;right:0;margin-top:4px;background:var(--card-bg);border:1px solid var(--border);border-radius:8px;padding:4px 0;list-style:none;z-index:100;min-width:160px;box-shadow:0 8px 24px rgba(0,0,0,.3)}.language-selector__dropdown[hidden]{display:none}.language-option{padding:6px 14px;cursor:pointer;display:flex;align-items:center;gap:8px;font-size:.9rem;color:var(--text-muted)}.language-option:hover{background:var(--border);color:var(--text)}.language-option--active{color:var(--accent)}.lang-code{font-size:1.1rem}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:12px}.feature-item{display:flex;flex-direction:column;background:rgba(30,41,59,.5);border:1px solid var(--border);border-radius:10px;padding:16px;transition:border-color .2s;height:100%}.feature-item:hover{border-color:var(--accent)}.feature-item .feat-icon{font-size:1.3em;margin-bottom:4px;flex-shrink:0}.feature-item strong{display:block;color:var(--text);margin-bottom:2px;font-size:.95em;flex-shrink:0}.feature-item span{color:var(--text-muted);font-size:.85em;line-height:1.4;flex:1}.highlight{background:rgba(37,99,235,.1);border-left:3px solid var(--accent);padding:14px 18px;margin:16px 0;border-radius:0 8px 8px 0;font-size:.9em}.warning{background:rgba(234,179,8,.06);border-left:3px solid #eab308;padding:16px 20px;margin-top:24px;border-radius:0 10px 10px 0}.warning strong{color:#fbbf24}.warning p{margin-top:6px;font-size:.9em}@media(max-width:600px){body{padding:16px}h1{font-size:1.5rem}h2{font-size:1.15rem;margin-top:24px}.container{padding:16px 0}.card{padding:18px 16px;margin-bottom:16px}.header-bar{gap:8px}.language-selector__btn{font-size:.82rem;padding:5px 10px}.feature-grid{grid-template-columns:1fr}.feature-item{flex-direction:row;align-items:center;gap:12px;padding:14px 16px}.feature-item .feat-icon{font-size:1.5em;margin-bottom:0}.feature-item strong{font-size:.9em}.feature-item span{font-size:.82em;flex:none}}