body {
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
    margin: 0;
    background: #0c0f14;
    color: #e4e7eb;
    line-height: 1.9;
}
header {
    padding: 4rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, #141e30, #243b55);
}
header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}
header p {
    font-size: 1.1rem;
    opacity: 0.9;
}
section {
    max-width: 960px;
    margin: 0 auto;
    padding: 4rem 2rem;
}
h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-left: 6px solid #4f8cff;
    padding-left: 1rem;
}
h3 {
    font-size: 1.4rem;
    margin-top: 2.5rem;
}
.box {
    background: #151a21;
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1.5rem;
}
th, td {
    border: 1px solid #2a2f36;
    padding: 1rem;
    text-align: left;
}
th {
    background: #1d2229;
}
footer {
    text-align: center;
    padding: 3rem 1rem;
    font-size: 0.9rem;
    color: #9aa4b2;
}
a {
    color: #4f8cff;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}