:root {
  --bg: #020817;
  --text: #f8fafc;
  --muted: #a8b3c7;
  --faint: #64748b;
  --line: rgba(148, 163, 184, 0.18);
  --cyan: #38d5ff;
  --blue: #0ea5ff;
  --green: #6ee7b7;
  --amber: #facc15;
  --orange: #f97316;
  --danger: #fb7185;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 12%, rgba(14, 165, 255, 0.2), transparent 24rem),
    radial-gradient(circle at 88% 4%, rgba(16, 185, 129, 0.16), transparent 26rem),
    radial-gradient(circle at 78% 90%, rgba(249, 115, 22, 0.12), transparent 30rem),
    linear-gradient(135deg, #020817 0%, #071224 58%, #020817 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(148, 163, 184, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(148, 163, 184, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at top left, black, transparent 54%);
}
a { color: inherit; text-decoration-color: rgba(56, 213, 255, 0.72); text-underline-offset: 0.22em; }
.site-shell { position: relative; width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
header { position: relative; z-index: 2; padding: 26px 0 10px; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 14px; text-decoration: none; }
.brand-mark { width: 54px; height: 54px; flex: 0 0 auto; filter: drop-shadow(0 12px 24px rgba(14, 165, 255, 0.22)); }
.brand-text { display: grid; gap: 2px; }
.brand-name { font-size: 1.35rem; font-weight: 850; letter-spacing: -0.05em; }
.brand-line { color: var(--muted); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 0.95rem; }
.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--text); }
.hero { padding: 48px 0 28px; }
.eyebrow { color: var(--cyan); font-size: .82rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
h1 { max-width: 900px; margin: 12px 0 0; font-size: clamp(2.7rem, 7vw, 5.8rem); line-height: .95; letter-spacing: -0.07em; }
.intro { max-width: 780px; margin: 18px 0 0; color: var(--muted); font-size: 1.08rem; line-height: 1.75; }
.calc-layout { display: grid; grid-template-columns: minmax(0, 0.98fr) minmax(300px, 0.72fr); gap: 20px; align-items: start; padding: 22px 0 72px; }
.calc-card, .result-card, .note-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255,255,255,.075), rgba(255,255,255,.025)), rgba(2, 8, 23, .64);
  box-shadow: 0 24px 80px rgba(0, 0, 0, .28);
}
.calc-card { padding: 22px; }
.result-card { position: sticky; top: 18px; padding: 22px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { color: #dff8ff; font-weight: 760; font-size: .92rem; }
.input-control {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(2, 8, 23, .72);
  color: var(--text);
  padding: 0 13px;
  font: inherit;
  color-scheme: dark;
}
.input-control:focus-visible { outline: none; border-color: rgba(94, 231, 255, .44); background: rgba(14, 165, 255, .12); }
.actions { display: flex; gap: 10px; margin-top: 16px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}
.btn-primary { color: #00111f; background: linear-gradient(135deg, var(--cyan), var(--blue)); box-shadow: 0 16px 30px rgba(14, 165, 255, .22); }
.btn-secondary { color: var(--text); background: rgba(255,255,255,.06); border-color: var(--line); }
.result-card h2, .note-card h2 { margin: 0 0 12px; letter-spacing: -.035em; }
.result-grid { display: grid; gap: 10px; }
.metric { padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.045); }
.metric span { display: block; color: var(--faint); font-size: .82rem; }
.metric strong { display: block; margin-top: 4px; font-size: clamp(1.4rem, 4vw, 2.15rem); letter-spacing: -.05em; }
.metric.good strong { color: var(--green); }
.metric.warn strong { color: var(--amber); }
.result-note { margin: 14px 0 0; color: var(--muted); line-height: 1.55; }
.note-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding-bottom: 72px; }
.note-card { padding: 20px; box-shadow: none; }
.note-card p { color: var(--muted); line-height: 1.65; }
footer { position: relative; border-top: 1px solid var(--line); padding: 34px 0 38px; color: var(--muted); }
.footer-inner { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: start; }
.footer-brand { display: grid; gap: 8px; max-width: 590px; }
.footer-logo { display: inline-flex; align-items: center; gap: 10px; width: fit-content; color: var(--text); text-decoration: none; font-weight: 850; letter-spacing: -0.03em; }
.footer-logo img { width: 32px; height: 32px; filter: drop-shadow(0 10px 20px rgba(14, 165, 255, 0.2)); }
.footer-copy { margin: 0; color: #dbeafe; font-weight: 650; }
.footer-note { margin: 0; color: var(--faint); line-height: 1.55; }
.footer-nav { display: grid; gap: 12px; justify-items: end; }
.footer-links, .footer-connect { display: flex; gap: 12px 18px; flex-wrap: wrap; justify-content: flex-end; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); }
.footer-connect a { display: inline-grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 999px; color: #dff8ff; background: rgba(255, 255, 255, 0.045); text-decoration: none; }
.footer-connect a:hover { border-color: rgba(94, 231, 255, 0.38); color: var(--text); background: rgba(14, 165, 255, 0.10); }
.footer-connect svg { width: 18px; height: 18px; fill: currentColor; }
@media (max-width: 860px) {
  .nav { align-items: flex-start; flex-direction: column; gap: 14px; }
  .nav-links { flex-wrap: wrap; gap: 12px; font-size: .9rem; }
  .brand-line { display: none; }
  .calc-layout, .note-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-nav { justify-items: start; }
  .footer-links, .footer-connect { justify-content: flex-start; }
  .result-card { position: relative; top: auto; }
}
@media (max-width: 560px) {
  .site-shell { width: min(100% - 28px, 1180px); }
  .form-grid { grid-template-columns: 1fr; }
  .actions { flex-direction: column; }
}