/* File: styles.css */

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-primary: #1e3a8a;
  --color-primary-light: #3b82f6;
  --color-secondary: #475569;
  --color-accent: #0ea5e9;
  --color-border: #e2e8f0;
  --color-note: #fef3c7;
  --color-note-border: #facc15;

  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.06);
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--color-bg);
  color: #0f172a;
  margin: 0;
  line-height: 1.6;
}

main.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

header.header {
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 16px;
}

.logo {
  width: 64px;
  height: 64px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 22px;
}

h1 {
  margin: 0;
  font-size: 1.8rem;
  color: var(--color-primary);
}

.subtitle {
  color: var(--color-secondary);
  font-size: 0.95rem;
}

section.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

article:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 30px rgba(0,0,0,0.08);
}

article.full {
  grid-column: 1 / -1;
}

h2 {
  margin-top: 0;
  color: var(--color-primary);
  font-size: 1.3rem;
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 4px;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

.note {
  background: var(--color-note);
  border-left: 4px solid var(--color-note-border);
  padding: 10px 14px;
  border-radius: 8px;
  color: #78350f;
  font-size: 0.95rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 40px;
  text-align: center;
  color: var(--color-secondary);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

@media (max-width: 700px) {
  header.header {
    flex-direction: column;
    text-align: center;
  }
  .logo {
    width: 56px;
    height: 56px;
    font-size: 18px;
  }
}