/* Base */
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f7f8fb;
  color: #0f1724;
}

/* Header */
header {
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}

.container {
  max-width: 1200px;
  margin: auto;
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  height: 40px;
  width: auto;
  display: block;
}

.brand strong {
  font-weight: 700;
}

.brand small {
  display: block;
  font-size: 12px;
  color: #6b7280;
}

/* Navigation */
nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #374151;
  font-weight: 500;
}

/* Hero */
.hero {
  padding: 56px 16px;
  max-width: 1200px;
  margin: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.hero-box {
  background: #eef6ff;
  padding: 20px;
  border-radius: 12px;
}

/* Sections */
.section {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 16px;
}

.section h2 {
  font-weight: 700;
  margin-bottom: 16px;
}

.section h3 {
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 12px;
}

.section p {
  margin-bottom: 14px;
  line-height: 1.6;
}

.section p:first-of-type {
  font-weight: 600;
}

.section ul {
  margin: 12px 0;
  padding-left: 20px;
}

.section ul li {
  margin-bottom: 10px;
  line-height: 1.5;
}

/* Emphasis */
strong {
  font-weight: 700;
  color: #0f1724;
}

/* Footer */
footer {
  text-align: center;
  padding: 20px;
  font-size: 14px;
  color: #6b7280;
}

/* ===== MOBILE OPTIMIZATION (iPhone 16+) ===== */
@media (max-width: 768px) {

  .container {
    padding: 12px 16px;
  }

  .brand {
    gap: 10px;
  }

  .brand strong {
    font-size: 16px;
  }

  .brand small {
    font-size: 11px;
    line-height: 1.3;
  }

  nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 40px 16px;
  }

  .hero h1 {
    font-size: 22px;
    line-height: 1.3;
  }

  .hero p {
    font-size: 15px;
  }

  .section {
    margin: 28px auto;
  }
}