:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --blue: #2563eb;
  --green: #0f766e;
  --dark: #0f172a;
  --border: #e5e7eb;
  --soft: #eef6ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #f8fafc 0%, #eef6ff 45%, #f8fafc 100%);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, #0f172a, #1d4ed8, #0f766e);
  color: #fff;
  padding: 42px 20px;
}

.header-inner {
  max-width: 980px;
  margin: 0 auto;
}

.logo {
  font-size: 42px;
  font-weight: 900;
  letter-spacing: -0.04em;
  margin: 0 0 10px;
}

.tagline {
  font-size: 20px;
  max-width: 720px;
  color: #e0f2fe;
  font-weight: 650;
}

nav {
  max-width: 980px;
  margin: 18px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.14);
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 46px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  margin: 18px 0;
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.07);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
}

.feature h3 {
  margin-top: 0;
}

.badge {
  display: inline-block;
  background: #dbeafe;
  color: #1d4ed8;
  font-weight: 800;
  padding: 8px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.warning {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #065f46;
}

.button {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  padding: 13px 18px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 800;
  margin-top: 10px;
}

.secondary {
  background: var(--green);
}

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 22px 20px;
  text-align: center;
  background: #fff;
}

h1, h2, h3 {
  line-height: 1.2;
}

small {
  color: var(--muted);
}

ul {
  padding-left: 22px;
}

@media (max-width: 760px) {
  .logo {
    font-size: 34px;
  }

  .tagline {
    font-size: 17px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  header {
    padding: 34px 18px;
  }
}