*{box-sizing:border-box}:root{--primary: #6366f1;--text-main: #e5e7eb;--text-sub: #9ca3af;--border: #1f2933;--bg: #0f172a;--card-bg: #111827}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,sans-serif;font-size:16px;line-height:1.6;background:var(--bg);color:var(--text-main)}.top-nav{position:sticky;top:0;z-index:10;background:#0f172ae6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.top-nav-inner{max-width:760px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:center;gap:16px}.brand{color:var(--text-main);text-decoration:none;font-weight:700;letter-spacing:-.02em;white-space:nowrap}.nav-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px}.nav-link{display:inline-block;padding:8px 10px;border-radius:10px;text-decoration:none;color:var(--text-sub);border:1px solid transparent}.nav-link:hover{color:var(--text-main);border-color:var(--border);background:#111827b3}.nav-link.is-active{color:#fff;background:#6366f12e;border-color:#6366f159}.header{text-align:center;padding:48px 16px 32px}.subtitle{color:var(--text-sub);margin-top:8px}.main{max-width:760px;margin:0 auto;padding:0 16px 64px}.calculator-card,.result-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:24px;margin-top:24px}.result-card{background:#1e1b4b;border-color:#312e81}input{width:100%;border:1px solid var(--border);border-radius:8px;padding:12px;font-size:16px;margin-top:12px;background:#020617;color:var(--text-main)}input::placeholder{color:#64748b}button{width:100%;background:var(--primary);color:#fff;border:none;border-radius:10px;padding:12px;font-size:16px;font-weight:600;margin-top:16px;cursor:pointer}button:hover{opacity:.92}.footer{text-align:center;font-size:14px;color:var(--text-sub);padding:0 0 32px}.footer-divider{height:1px;background:#1f2933;margin:0 0 32px}