:root {
    color-scheme: light;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #1f2937;
    background: #ffffff;
}

body {
    margin: 0;
    line-height: 1.6;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.site-header,
.site-footer,
.site-main {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid #e5e7eb;
}

.brand {
    font-weight: 700;
    color: #111827;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.site-main {
    padding: 48px 0;
}

.hero {
    padding: 64px 0;
}

.hero h1 {
    max-width: 760px;
    margin: 0 0 16px;
    font-size: 3rem;
    line-height: 1.05;
}

.hero p,
.page-header p {
    max-width: 720px;
    color: #4b5563;
}

.content-list {
    display: grid;
    gap: 20px;
}

.content-card,
.content-detail {
    max-width: 760px;
}

.rich-content img {
    max-width: 100%;
    height: auto;
}

.site-footer {
    padding: 24px 0;
    border-top: 1px solid #e5e7eb;
    color: #6b7280;
}