:root {
  --bg: #0f172a;
  --panel: #111827;
  --muted: #9ca3af;
  --text: #e5e7eb;
  --accent: #38bdf8;
  --accent-strong: #22d3ee;
  --border: #1f2937;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.12), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(34, 211, 238, 0.18), transparent 25%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.hero h1 {
  margin: 4px 0;
  font-size: 32px;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0;
  color: var(--muted);
}

.hero-badge {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.25), rgba(34, 211, 238, 0.08));
  color: var(--accent-strong);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 10px 14px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label {
  font-weight: 600;
}

input[type="number"],
select {
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  color: var(--text);
}

input[type="range"] {
  accent-color: var(--accent);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
}

.actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 14px;
  flex-wrap: wrap;
}

button {
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0b1220;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 12px 18px;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.25);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 34px rgba(34, 211, 238, 0.32);
}

button:active {
  transform: translateY(0);
}

.error {
  color: #fca5a5;
  margin: 0;
  min-height: 20px;
}

.results {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.results-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.result-number {
  font-size: 28px;
  margin: 4px 0 0;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 6px;
}

@media (max-width: 640px) {
  .hero {
    flex-direction: column;
    align-items: flex-start;
  }

  .result-number {
    font-size: 24px;
  }
}