*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--aitb-color-bg);color:var(--aitb-color-text);font-family:"Noto Sans Bengali","Noto Sans",system-ui,sans-serif;line-height:1.65}h1,h2,h3{line-height:1.2;margin:0 0 var(--aitb-space-md)}p{margin:.5rem 0 1rem}a{color:inherit}.aitb-shell{width:min(calc(100% - 2rem),var(--aitb-max));margin:auto}.aitb-button{border:1px solid var(--aitb-color-primary);background:var(--aitb-color-primary);color:#fff;border-radius:var(--aitb-radius-sm);padding:.55rem .9rem;cursor:pointer}.aitb-button--ghost{background:transparent;color:var(--aitb-color-primary)}.aitb-site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--aitb-color-surface) 92%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--aitb-color-border)}.aitb-header-inner{min-height:64px;display:flex;align-items:center;gap:1rem}.aitb-brand{font-weight:800;text-decoration:none;margin-right:auto}.aitb-nav{display:flex;gap:1rem}.aitb-nav a{text-decoration:none;color:var(--aitb-color-muted)}.aitb-actions{display:flex;gap:.5rem}.aitb-site-footer{border-top:1px solid var(--aitb-color-border);padding:1rem 0;color:var(--aitb-color-muted)}.aitb-site-footer .aitb-shell{display:flex;justify-content:space-between}