:root {
  --primary: #1867c0;
  --primary-dark: #0d47a1;
  --accent: #42a5f5;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --border: #e3e7ee;
  --text: #1f2937;
  --muted: #6b7280;
  --code-bg: #0f172a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 32px 0;
  margin-bottom: 20px;
}

.brand {
  display: flex;
  gap: 20px;
  align-items: center;
}

.logo {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: #fff;
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tagline {
  opacity: 0.9;
  max-width: 520px;
}

.actions {
  margin-left: auto;
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.4);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.btn.primary {
  background: #fff;
  color: var(--primary);
  border-color: #fff;
}

/* Layout */
.grid {
  display: grid;
  gap: 18px;
}

.grid.two {
  grid-template-columns: 2fr 1fr;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.card.wide {
  margin-top: 20px;
}

/* Typography */
h1, h2, h3 {
  margin-top: 0;
}

.note {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Code */
pre.code {
  background: var(--code-bg);
  color: #e5e7eb;
  padding: 14px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.9rem;
}

/* Footer */
.footer {
  margin: 32px 0 16px;
  text-align: center;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 900px) {
  .grid.two {
    grid-template-columns: 1fr;
  }

  .brand {
    flex-wrap: wrap;
  }

  .actions {
    width: 100%;
  }
}