:root{color-scheme:light dark;--bg:#fff;--fg:#202124;--muted:#686b70;--line:#e7e8eb;--accent:#c13f1a}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.7 system-ui,sans-serif}nav,main,footer{max-width:820px;margin:auto;padding:24px}nav{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}nav span{display:flex;flex-wrap:wrap;gap:16px;font-size:13px}a{color:var(--accent);text-underline-offset:4px}h1{font-size:clamp(28px,6vw,44px);line-height:1.2;letter-spacing:-1px}h2{font-size:22px;margin-top:36px}footer{color:var(--muted);border-top:1px solid var(--line)}form{max-width:480px;margin-block:32px}label{display:block;margin:18px 0}input:not([type=checkbox]){display:block;width:100%;padding:13px;font:inherit;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg)}input[type=checkbox]{margin-right:12px}button{background:var(--accent);color:#fff;border:0;border-radius:8px;padding:14px 20px;font:inherit;cursor:pointer}button:disabled{opacity:.6;cursor:wait}#result{white-space:pre-wrap}@media(prefers-color-scheme:dark){:root{--bg:#121314;--fg:#f5f5f7;--muted:#adb0b6;--line:#303237;--accent:#ff855f}button{color:#231f1c}}@media(max-width:540px){nav{display:block}nav span{margin-top:12px}}