:root {
  --primary: #1a73e8;
  --dark: #1a1a2e;
  --light: #f8f9fa;
  --text: #333;
  --accent: #00b4d8;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header {
  background: var(--dark);
  color: #fff;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header .logo {
  font-size: 1.4rem;
  font-weight: 700;
}

header .logo span { color: var(--accent); }

nav a {
  color: #ccc;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}
nav a:hover { color: #fff; text-decoration: none; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, #16213e 100%);
  color: #fff;
  text-align: center;
  padding: 5rem 2rem;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: #b0b8c4;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s;
}
.btn:hover { background: #1557b0; text-decoration: none; }

/* Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 3rem 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.card {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 10px;
  padding: 2rem;
  transition: box-shadow 0.2s;
}
.card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.08); }

.card h3 { margin-bottom: 0.5rem; font-size: 1.2rem; }
.card p { color: #666; font-size: 0.95rem; margin-bottom: 1rem; }
.card a { font-weight: 600; }

/* Article */
article h1 { font-size: 2.2rem; margin-bottom: 0.5rem; }
article .meta { color: #888; margin-bottom: 2rem; }
article h2 { margin: 2rem 0 1rem; color: var(--dark); }
article h3 { margin: 1.5rem 0 0.5rem; }
article p { margin-bottom: 1rem; }
article ul, article ol { margin: 1rem 0 1rem 2rem; }
article li { margin-bottom: 0.5rem; }
article table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
article th, article td { border: 1px solid #ddd; padding: 0.75rem; text-align: left; }
article th { background: var(--light); }

/* Section titles */
.section-title {
  text-align: center;
  padding: 3rem 2rem 0;
  font-size: 1.8rem;
  color: var(--dark);
}

/* Footer */
footer {
  background: var(--dark);
  color: #999;
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
  font-size: 0.9rem;
}