:root {
    color-scheme: light dark;
}
body {
    font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
    line-height: 1.7;
    margin: 0;
    padding: 2rem clamp(1.25rem, 4vw, 3rem);
    background: #f5f5f5;
    color: #222;
}
main {
    max-width: 960px;
    margin: 0 auto;
    background: #fff;
    padding: clamp(1.5rem, 3vw, 2.5rem);
    border-radius: 16px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}
h1 {
    font-size: clamp(1.9rem, 3.6vw, 2.4rem);
    margin-top: 0;
    margin-bottom: 1rem;
    border-bottom: 4px solid #274690;
    padding-bottom: 0.35rem;
}
h2 {
    font-size: clamp(1.4rem, 2.8vw, 1.9rem);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}
h3 {
    font-size: clamp(1.2rem, 2.4vw, 1.5rem);
    margin-top: 1.8rem;
    margin-bottom: 0.6rem;
}
h4 {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    margin-top: 1.4rem;
    margin-bottom: 0.4rem;
}
p {
    margin: 0.6rem 0;
}
ul,
ol {
    margin: 0.6rem 0 1rem 1.4rem;
}
dt {
    font-weight: 600;
    margin-top: 1rem;
}
dd {
    margin-left: 1.2rem;
}
code {
    background: rgba(39, 70, 144, 0.1);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: "Fira Code", "Source Code Pro", monospace;
}
pre {
    background: rgba(39, 70, 144, 0.1);
    padding: 1rem;
    border-radius: 12px;
    overflow-x: auto;
}
pre code {
    background: transparent;
    padding: 0;
}
.tip,
.warning {
    border-radius: 12px;
    padding: 1rem 1.2rem;
    margin: 1.5rem 0;
}
.tip {
    background: #f4fbf4;
    border-left: 4px solid #2b9348;
}
.warning {
    background: #fff7e6;
    border-left: 4px solid #f4a259;
}
.table-container {
    overflow-x: auto;
}
table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
}
th,
td {
    border: 1px solid #ccd6eb;
    padding: 0.75rem;
    text-align: left;
}
th {
    background: #274690;
    color: #fff;
    font-weight: 600;
}
.small-note {
    font-size: 0.9rem;
    color: #555;
}