:root{--color-bg:#fafafa;--color-surface:#fff;--color-border:#e5e7eb;--color-border-subtle:#f3f4f6;--color-text:#111827;--color-text-secondary:#6b7280;--color-text-muted:#9ca3af;--color-primary:#111827;--color-accent:#6366f1;--font-sans:"Inter", "Noto Sans SC", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--shadow-xs:0 1px 2px #0000000d;--shadow-sm:0 1px 3px #00000014, 0 1px 2px #0000000a;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -1px #0000000a;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -2px #0000000a;--nav-height:64px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;font-size:16px}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);min-height:100vh;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.nav{height:var(--nav-height);backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);z-index:100;background:#ffffffeb;position:fixed;top:0;left:0;right:0}.nav__inner{justify-content:space-between;align-items:center;gap:24px;max-width:1200px;height:100%;margin:0 auto;padding:0 24px;display:flex}.nav__brand{flex-shrink:0;align-items:baseline;gap:10px;display:flex}.nav__logo{letter-spacing:-.5px;color:var(--color-text);font-size:18px;font-weight:700}.nav__tagline{color:var(--color-text-muted);font-size:13px;font-weight:400}.nav__links{align-items:center;gap:4px;display:flex}.nav__link{border-radius:var(--radius-sm);color:var(--color-text-secondary);padding:6px 12px;font-size:14px;font-weight:500;transition:all .15s}.nav__link:hover{color:var(--color-text);background:var(--color-border-subtle)}.nav__button{cursor:pointer;font:inherit;background:0 0;border:none}.nav__link--lang{color:var(--color-accent);border:1px solid var(--color-accent);opacity:.8;font-weight:700}.nav__link--lang:hover{opacity:1;background:#6366f114}.nav__link--lang-disabled{opacity:.3;cursor:not-allowed;pointer-events:none}.nav__link--search{align-items:center;gap:4px;display:inline-flex}.nav__search-icon{font-size:16px;line-height:1}.nav__dropdown{position:relative}.nav__link--dropdown{cursor:pointer;align-items:center;gap:3px;display:inline-flex}.nav__dropdown-arrow{font-size:10px;transition:transform .2s}.nav__dropdown-menu{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);min-width:140px;box-shadow:var(--shadow-lg);z-index:200;padding:10px 0 6px;display:none;position:absolute;top:calc(100% - 4px);left:50%;transform:translate(-50%)}.nav__dropdown-menu:before{content:"";height:8px;position:absolute;top:-8px;left:0;right:0}.nav__dropdown:hover .nav__dropdown-menu,.nav__dropdown--open .nav__dropdown-menu{display:block}.nav__dropdown:hover .nav__dropdown-arrow{transform:rotate(180deg)}.nav__dropdown-item{color:var(--color-text-secondary);white-space:nowrap;padding:8px 16px;font-size:14px;font-weight:500;transition:all .15s;display:block}.nav__dropdown-item:hover{color:var(--color-text);background:var(--color-border-subtle)}.nav__hamburger{cursor:pointer;background:0 0;border:none;flex-direction:column;gap:5px;padding:4px;display:none}.nav__hamburger span{background:var(--color-text);border-radius:2px;width:22px;height:2px;transition:all .2s;display:block}.footer{border-top:1px solid var(--color-border);margin-top:80px;padding:48px 24px}.footer__inner{justify-content:space-between;align-items:flex-start;gap:40px;max-width:1200px;margin:0 auto;display:flex}.footer__logo{letter-spacing:-.5px;font-size:20px;font-weight:700}.footer__desc{color:var(--color-text-secondary);margin-top:6px;font-size:14px}.footer__meta{text-align:left;color:var(--color-muted);font-size:13px;line-height:1.8}main{padding-top:var(--nav-height)}.container{max-width:1200px;margin:0 auto;padding:0 24px}.section{padding:80px 0}.section-title{letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:16px;font-size:13px;font-weight:600}.section-heading{letter-spacing:-.5px;color:var(--color-text);font-size:28px;font-weight:700}.prose{color:#374151;max-width:720px;font-size:16px;line-height:1.8}.prose h1{letter-spacing:-.5px;margin:2em 0 .75em;font-size:28px;font-weight:700}.prose h2{border-top:1px solid var(--color-border);margin:2em 0 .75em;padding-top:1em;font-size:20px;font-weight:600}.prose h3{margin:1.5em 0 .5em;font-size:17px;font-weight:600}.prose p{margin:1em 0}.prose ul,.prose ol{margin:1em 0;padding-left:1.5em}.prose li{margin:.3em 0}@media (width<=768px){.nav__links{display:none}.nav__hamburger{display:flex}.nav--open .nav__links{top:var(--nav-height);border-bottom:1px solid var(--color-border);background:#fff;flex-direction:column;gap:4px;padding:16px 24px;display:flex;position:fixed;left:0;right:0}.nav__dropdown{flex-direction:column;align-items:stretch;display:flex}.nav__link--dropdown{align-items:center;gap:3px;display:flex}.nav__dropdown-menu{box-shadow:none;border:none;margin-top:0;padding:0;position:static;transform:none}.nav__dropdown-item{padding-left:28px}.nav--open .nav__dropdown-menu{display:block}.nav__dropdown-arrow{display:none}.footer__inner{flex-direction:column}.footer__meta{text-align:left}}