@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --primary: #0b1220;
  --primary-mid: #111827;
  --accent: #0f766e;
  --accent-light: #14b8a6;
  --bg: #f9fafb;
  --surface: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0,0,0,0.05), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 6px rgba(0,0,0,0.04), 0 10px 30px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-light); }

header {
  background: var(--primary);
  color: white;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.container { max-width: 1160px; margin: 0 auto; padding: 0 1.5rem; }
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 68px;
}
.logo { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.4px; }
nav ul { display: flex; gap: 2.25rem; list-style: none; }
nav a {
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  font-size: 0.92rem;
  transition: color 0.15s;
}
nav a:hover { color: white; }

.hero {
  background: linear-gradient(180deg, #0b1220 0%, #111827 100%);
  color: white;
  padding: 6rem 0 5rem;
  text-align: center;
}
.hero h1 {
  font-size: 3.25rem;
  font-weight: 700;
  letter-spacing: -0.8px;
  line-height: 1.1;
  margin-bottom: 1rem;
}
.hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.75);
  max-width: 620px;
  margin: 0 auto 2.25rem;
  font-weight: 400;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 0.85rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  border: none;
}
.btn:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.4);
  margin-left: 0.75rem;
}
.btn-outline:hover { background: rgba(255,255,255,0.08); border-color: white; }

section { padding: 4.5rem 0; }
.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.4px;
  margin-bottom: 0.75rem;
  color: var(--primary);
}
.section-sub {
  text-align: center;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 2.75rem;
  font-size: 1.02rem;
}

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.card {
  background: var(--surface);
  border-radius: 12px;
  padding: 1.75rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: all 0.22s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card h3 { font-size: 1.15rem; font-weight: 650; margin-bottom: 0.5rem; color: var(--primary); }
.card p { color: var(--muted); font-size: 0.95rem; }
.date { margin-top: 1rem; font-size: 0.8rem; color: var(--muted); font-weight: 500; }

.tools-section { background: #f3f4f6; }
footer {
  background: var(--primary);
  color: rgba(255,255,255,0.65);
  text-align: center;
  padding: 2.75rem 0;
  font-size: 0.9rem;
}
footer a { color: #5eead4; }

@media (max-width: 768px) {
  .hero { padding: 4.5rem 0 3.5rem; }
  .hero h1 { font-size: 2.3rem; }
  nav ul { gap: 1.5rem; }
  .btn-outline { margin-left: 0; margin-top: 0.75rem; }
}