* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  margin: 0;
  color: #111;
  background: #ffffff;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 0 20px;
}

header {
  border-bottom: 1px solid #E5E7EB;
  padding: 16px 0;
}

nav a {
  margin-right: 20px;
  text-decoration: none;
  color: #111;
  font-weight: 600;
}

section {
  padding: 60px 0;
}

.bg-light {
  background: #F8F9FB;
}

.card {
  background: #fff;
  border: 1px solid #E5E7EB;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

h1 { font-size: 36px; }
h2 { font-size: 26px; }
h3 { font-size: 20px; }

p, li {
  color: #4B5563;
  font-size: 16px;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border: 1px solid #111;
  border-radius: 8px;
  color: #111;
  font-weight: 700;
  text-decoration: none;
  margin-top: 16px;
}

footer {
  border-top: 1px solid #E5E7EB;
  padding: 20px 0;
  font-size: 14px;
  color: #6B7280;
}

.fade-in {
  animation: fadeIn 0.8s ease-out both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.08);
}

.btn {
  transition: background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  background: #111;
  color: #fff;
}

nav a {
  position: relative;
}

nav a::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: #111;
  transition: width 0.2s ease;
}

nav a:hover::after {
  width: 100%;
}

html {
  scroll-behavior: smooth;
}