:root{--bg:#0b0f13;--card:#11161d;--text:#e9eef5;--muted:#a8b0bd;--accent:#4da3ff;--border:#1c2430}
*{box-sizing:border-box}html{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Arial,sans-serif;line-height:1.5}
body{margin:0;background:var(--bg);color:var(--text)}
.container{max-width:960px;margin:0 auto;padding:24px}
.header{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:space-between}
.brand{font-weight:700;letter-spacing:.2px}
nav a{color:var(--muted);text-decoration:none;margin-right:12px}
nav a.active, nav a:hover{color:var(--text)}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;margin-top:16px}
h1,h2{margin:0 0 12px}
.label{display:block;font-weight:600;margin:12px 0 6px}
.input{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--border);background:#0f141a;color:var(--text)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:700px){.row{grid-template-columns:1fr}}
.small{color:var(--muted);font-size:.95rem}
.result{font-size:1.4rem;font-weight:700;margin-top:8px;display:flex;align-items:center;gap:8px}
.copy{font-size:.85rem;border-radius:8px;border:1px solid var(--border);padding:4px 8px;cursor:pointer}
footer{margin-top:40px;color:var(--muted)}
ul.inline{padding-left:18px;margin-top:6px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width:900px){.grid-3{grid-template-columns:1fr}}
code{background:#0d1218;border:1px solid var(--border);padding:2px 6px;border-radius:6px}
hr{border:none;border-top:1px solid var(--border);margin:20px 0}