:root{--bg: #0b1220;--card: #0f1724;--muted: #9ab;--accent: #6cf;--text: #eaf0ff}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system;background:var(--bg);color:var(--text)}header{padding:20px;border-bottom:1px solid rgba(255,255,255,.04);display:flex;align-items:center;justify-content:space-between}h1{margin:0;font-size:20px}button{background:var(--accent);color:#012;padding:8px 12px;border-radius:8px;border:0;cursor:pointer;font-weight:700}.container{max-width:1000px;margin:24px auto;padding:0 16px;display:grid;grid-template-columns:1fr 360px;gap:16px}.card{background:var(--card);padding:16px;border-radius:12px;border:1px solid rgba(255,255,255,.03)}label{display:block;margin-bottom:8px;color:var(--muted);font-size:13px}input,select{width:100%;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,.04);background:#08101a;color:var(--text)}.result{margin-top:12px}.small{font-size:13px;color:var(--muted)}.footer{text-align:center;padding:20px;color:var(--muted);font-size:13px}