/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
.logo{font:800 1.15rem/1 var(--display);text-decoration:none;display:flex;align-items:center;gap:10px}
.logo i{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--ink);color:var(--bg);font:600 .8rem/1 var(--mono);font-style:normal}
.nav{display:flex;gap:26px;font-size:.95rem}
.nav a{text-decoration:none;color:var(--muted);position:relative;padding-block:6px}
.nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .25s}
.nav a:hover{color:var(--ink)} .nav a:hover::after{transform:scaleX(1)}
.tools{display:flex;align-items:center;gap:12px}
.theme{display:flex;margin:0;padding:3px;border:1px solid var(--line);border-radius:999px;background:var(--paper);min-width:0}
.theme legend{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
.theme input{position:absolute;opacity:0;width:1px;height:1px}
.theme span{display:block;font:600 .74rem/1 var(--mono);padding:8px 11px;border-radius:999px;color:var(--muted);cursor:pointer;transition:background .2s,color .2s}
.theme span:hover{color:var(--ink)}
.theme input:checked+span{background:var(--ink);color:var(--bg)}
.theme input:focus-visible+span{outline:3px solid var(--hl);outline-offset:2px}
@media (max-width:720px){ .nav{display:none} .theme span{padding:8px 8px} }
@media (max-width:480px){ .logo{font-size:0;gap:0} .logo i{font-size:.8rem} .top .btn span{display:none} }