:root {
  --bg: #0a1020;
  --panel: #111933;
  --text: #e7edff;
  --muted: #9fb2e8;
  --accent: #2dd4bf;
  --accent-dark: #14b8a6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: linear-gradient(180deg, #070b16 0%, #0d1530 100%);
  color: var(--text);
  line-height: 1.6;
}

.hero {
  min-height: 90vh;
  padding: 1rem 1.2rem 3rem;
  background: radial-gradient(circle at top right, #18306f 0%, #0a1020 50%);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

.nav ul {
  display: flex;
  list-style: none;
  gap: 1rem;
  padding: 0;
}

.nav a {
  color: var(--text);
  text-decoration: none;
}

.logo {
  font-weight: 700;
  color: var(--accent);
}

.hero-content {
  max-width: 760px;
  margin: 5rem auto 0;
  text-align: left;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  margin: 0.5rem 0 1rem;
}

.tag {
  display: inline-block;
  background: #1b2950;
  color: var(--accent);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3.5rem 1.2rem;
}

.alt {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 18px;
}

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

.card {
  background: var(--panel);
  border: 1px solid rgba(159, 178, 232, 0.2);
  border-radius: 14px;
  padding: 1rem;
}

.intro {
  color: var(--muted);
}

.checklist {
  padding-left: 1.2rem;
}

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

.timeline > div {
  background: var(--panel);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  padding: 1rem;
}

.calculator {
  margin-top: 2rem;
  background: var(--panel);
  border: 1px solid rgba(45, 212, 191, 0.35);
  border-radius: 14px;
  padding: 1.2rem;
  max-width: 420px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
}

input {
  border: 1px solid rgba(159, 178, 232, 0.4);
  background: #0b1123;
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #001613;
  font-weight: 700;
  border: none;
  border-radius: 9px;
  padding: 0.65rem 1rem;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent-dark);
}

.secondary {
  margin-top: 0.25rem;
}

.result {
  margin-top: 0.8rem;
  color: var(--accent);
  font-weight: 600;
}

footer {
  text-align: center;
  padding: 2rem 1rem 2.5rem;
  color: var(--muted);
}