:root{--bg:#ffffff;--text:#0b1220;--muted:#5b6473;--card:#f6f7f9;--border:#e5e7eb;--primary:#2563eb;--primary-contrast:#ffffff;--shadow:0 6px 24px rgba(0,0,0,.08);--radius:14px}
:root.dark{--bg:#0f1522;--text:#e7ecf6;--muted:#a9b3c3;--card:#161c2a;--border:#233049;--primary:#60a5fa;--primary-contrast:#031022;--shadow:0 8px 28px rgba(0,0,0,.3)}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;line-height:1.5;background:var(--bg);color:var(--text)}
img{max-width:100%;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 16px}
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:16px;top:16px;width:auto;height:auto;background:var(--primary);color:var(--primary-contrast);padding:8px 12px;border-radius:8px;z-index:1000}

.site-header{position:sticky;top:0;background:var(--bg);backdrop-filter:saturate(1.2) blur(6px);border-bottom:1px solid var(--border);z-index:10}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none;font-weight:700}
.brand-logo{width:28px;height:28px}
.site-nav ul{display:flex;gap:14px;list-style:none;margin:0;padding:0}
.site-nav a{padding:8px 10px;border-radius:10px;text-decoration:none;color:var(--text)}
.site-nav a.active,.site-nav a:focus-visible,.site-nav a:hover{background:var(--card)}
.theme-toggle{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:100px;padding:8px 10px;cursor:pointer}

.hero{padding:56px 0 24px}
.hero-content{display:grid;gap:16px}
.hero .cta{display:inline-block}

.button{background:var(--primary);color:var(--primary-contrast);border:none;border-radius:12px;padding:10px 14px;cursor:pointer;box-shadow:var(--shadow)}
.button.secondary{background:transparent;color:var(--text);border:1px solid var(--border);box-shadow:none}
.button:focus-visible{outline:2px solid var(--primary)}

.tool-section .section-header{margin:24px 0 12px}
.tabs{display:flex;gap:8px;margin:12px 0}
.tab{background:var(--card);border:1px solid var(--border);padding:8px 12px;border-radius:10px;cursor:pointer}
.tab[aria-selected="true"]{background:var(--primary);color:var(--primary-contrast);border-color:transparent}
.tab-panel{margin-top:12px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.card.subtle{background:transparent}
.controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:12px}
.controls.grid{display:grid;grid-template-columns:1fr;gap:10px}
.controls label{display:flex;gap:8px;align-items:center}
.controls input[type="text"]{padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text)}
.toggle{display:flex;gap:8px;align-items:center}
.spacer{flex:1}
.download-group{display:flex;gap:8px}
.canvas-wrap{border:1px dashed var(--border);border-radius:12px;background:checkerboard(#fff,#f3f4f6)}
#signatureCanvas{display:block;width:100%;height:280px}
.help{color:var(--muted);margin:8px 2px}
.typed-preview{margin-top:10px}
.typed-output{min-height:160px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--border);border-radius:12px;background:transparent;overflow:hidden}

.faq{padding:24px 0 48px;display:grid;gap:8px}
.faq details{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:10px}

.site-footer{border-top:1px solid var(--border);margin-top:40px;padding:20px 0}
.footer-inner{display:grid;gap:12px;grid-template-columns:1fr}
.footer-inner nav ul{display:flex;flex-wrap:wrap;gap:12px;list-style:none;margin:0;padding:0}
.muted{color:var(--muted)}

@media (min-width:768px){
  .controls.grid{grid-template-columns:1fr 1fr}
  .footer-inner{grid-template-columns:1fr auto auto}
}
@media (min-width:1100px){
  #signatureCanvas{height:360px}
}

/* Utility */
.button:disabled{opacity:.6;cursor:not-allowed}

/* Minimal checkerboard background for canvas container */
@supports (background: paint(worklet)){}
@keyframes fadeIn{from{opacity:.6;transform:translateY(2px)}to{opacity:1;transform:none}}