body {
    margin: 0;
    font-family: Arial, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
    color: #1f2937;
    background: #ffffff;
    line-height: 1.7;
}

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

header {
    border-bottom: 1px solid #e5e7eb;
    padding: 20px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

nav a {
    margin-left: 16px;
    text-decoration: none;
    color: #1f2937;
}

.hero {
    padding: 80px 0;
}

h1,
h2 {
    margin-top: 0;
}

footer {
    border-top: 1px solid #e5e7eb;
    padding: 24px 0;
    margin-top: 60px;
}