:root {
  --bg: #0b1220;
  --bg-elev: #121a2b;
  --bg-card: #162033;
  --border: #243149;
  --text: #e8eef9;
  --muted: #9aa8c1;
  --accent: #5b8cff;
  --accent-2: #7c5cff;
  --good: #3dd68c;
  --warn: #f5b942;
  --bad: #ff6b7a;
  --shadow: 0 10px 30px rgba(0,0,0,.28);
  --radius: 16px;
  --max: 980px;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(91,140,255,.22), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(124,92,255,.18), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(11,18,32,.72);
  border-bottom: 1px solid rgba(36,49,73,.8);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .9rem 0;
}
.brand {
  display: flex; align-items: center; gap: .65rem;
  color: var(--text); font-weight: 700; letter-spacing: -.02em;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.logo {
  width: 2rem; height: 2rem; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; color: white; font-size: .85rem; font-weight: 800;
  box-shadow: 0 6px 16px rgba(91,140,255,.35);
}
.nav-links { display: flex; gap: 1rem; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-size: .95rem; }
.nav-links a:hover { color: var(--text); }

.hero { padding: 3.2rem 0 1.5rem; }
.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  line-height: 1.15; margin: 0 0 .75rem; letter-spacing: -.03em;
}
.lead { color: var(--muted); font-size: 1.08rem; max-width: 42rem; margin: 0 0 1.5rem; }
.badge {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .25rem .6rem; border-radius: 999px;
  background: rgba(91,140,255,.12); color: #b9ceff;
  border: 1px solid rgba(91,140,255,.28); font-size: .8rem; margin-bottom: 1rem;
}

.grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  padding: 0 0 2.5rem;
}
.card {
  background: linear-gradient(180deg, rgba(22,32,51,.95), rgba(18,26,43,.95));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
  box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-2px); border-color: #35507a; }
.card h2, .card h3 { margin: 0 0 .4rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .meta { margin-top: .85rem; font-size: .82rem; color: #7f90ad; }

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.tool-layout {
  display: grid; gap: 1.25rem;
  grid-template-columns: 1.1fr .9fr;
  padding: 1.5rem 0 2.5rem;
}
@media (max-width: 820px) {
  .tool-layout { grid-template-columns: 1fr; }
}

label { display: block; font-size: .9rem; color: #c5d1e6; margin-bottom: .35rem; }
.field { margin-bottom: 1rem; }
.hint { color: var(--muted); font-size: .8rem; margin-top: .3rem; }

input[type="number"], select {
  width: 100%;
  background: #0e1626;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 12px;
  padding: .75rem .85rem;
  font-size: 1rem;
  outline: none;
}
input[type="number"]:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91,140,255,.2);
}

.toggle-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .85rem 0; border-top: 1px solid rgba(36,49,73,.8);
}
.toggle {
  display: inline-flex; align-items: center; gap: .55rem; cursor: pointer; user-select: none;
}
.toggle input { width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }

.stats {
  display: grid; gap: .75rem; grid-template-columns: 1fr 1fr;
}
.stat {
  background: #0e1626; border: 1px solid var(--border); border-radius: 12px; padding: .9rem;
}
.stat .label { color: var(--muted); font-size: .8rem; }
.stat .value { font-size: 1.35rem; font-weight: 700; margin-top: .15rem; letter-spacing: -.02em; }
.stat.good .value { color: var(--good); }
.stat.warn .value { color: var(--warn); }

.breakdown { margin-top: 1rem; }
.row {
  display: flex; justify-content: space-between; gap: 1rem;
  padding: .55rem 0; border-bottom: 1px dashed rgba(36,49,73,.9);
  font-size: .95rem;
}
.row:last-child { border-bottom: 0; }
.row .k { color: var(--muted); }
.row .v { font-variant-numeric: tabular-nums; }
.row.total { font-weight: 700; border-top: 1px solid var(--border); margin-top: .4rem; padding-top: .8rem; border-bottom: 0; }
.row.total .k { color: var(--text); }

.disclaimer {
  margin-top: 1rem; padding: .85rem 1rem;
  background: rgba(245,185,66,.08);
  border: 1px solid rgba(245,185,66,.25);
  border-radius: 12px; color: #f0d59a; font-size: .86rem;
}

.prose { padding: 2rem 0 3rem; max-width: 720px; }
.prose h1 { margin-top: 0; }
.prose h2 { margin-top: 1.8rem; }
.prose p, .prose li { color: #c7d2e5; }

.faq details {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: .85rem 1rem; margin-bottom: .7rem;
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { color: var(--muted); margin: .6rem 0 0; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem; color: var(--muted); font-size: .9rem;
}
.site-footer .foot {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.muted { color: var(--muted); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}