:root {
    --blog-paper: #f7f5f0;
    --blog-surface: #fffefa;
    --blog-ink: #202b2b;
    --blog-muted: #687473;
    --blog-line: #dcded8;
    --blog-teal: #167d76;
    --blog-teal-dark: #0f5d58;
    --blog-teal-soft: #e4f1ee;
    font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui, sans-serif;
    color: var(--blog-ink);
    background: var(--blog-paper);
    font-synthesis: none;
    text-rendering: optimizeLegibility;
}

* {
    box-sizing: border-box;
}

html {
    background: var(--blog-paper);
}

body {
    margin: 0;
    min-width: 320px;
    background: var(--blog-paper);
    color: var(--blog-ink);
    line-height: 1.75;
}

a {
    color: var(--blog-teal-dark);
}

a:focus-visible {
    outline: 3px solid rgba(22, 125, 118, .42);
    outline-offset: 3px;
}

.blog-shell {
    width: min(900px, calc(100% - 40px));
    margin: 0 auto;
    padding: 42px 0 72px;
}

.blog-brand,
.blog-back {
    font-size: .86rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-decoration: none;
}

.blog-header {
    padding: 76px 0 42px;
}

.blog-header h1,
.post-header h1 {
    margin: 0;
    letter-spacing: -.045em;
    line-height: 1.2;
}

.blog-header h1 {
    font-size: clamp(2.4rem, 7vw, 4.7rem);
}

.blog-header p:last-child {
    max-width: 560px;
    margin: 20px 0 0;
    color: var(--blog-muted);
}

.blog-eyebrow,
.post-eyebrow {
    margin: 0 0 12px;
    color: var(--blog-teal);
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .16em;
}

.post-list {
    display: grid;
    gap: 16px;
}

.post-card {
    padding: 26px 28px 24px;
    border: 1px solid var(--blog-line);
    background: var(--blog-surface);
}

.post-card h2 {
    margin: 4px 0 8px;
    font-size: clamp(1.35rem, 3vw, 1.8rem);
    line-height: 1.3;
}

.post-card h2 a {
    color: var(--blog-ink);
    text-decoration: none;
}

.post-card h2 a:hover {
    color: var(--blog-teal-dark);
}

.post-card p:last-child,
.post-summary {
    margin: 0;
    color: var(--blog-muted);
}

.post-date {
    margin: 0;
    color: var(--blog-teal);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .04em;
}

.post-empty {
    margin: 0;
    padding: 34px 28px;
    border: 1px dashed var(--blog-line);
    color: var(--blog-muted);
    background: rgba(255, 254, 250, .64);
}

.blog-back {
    margin: 34px 0 0;
}

.blog-article-shell {
    max-width: 820px;
}

.post-article {
    margin-top: 54px;
    padding: clamp(28px, 5vw, 58px);
    border: 1px solid var(--blog-line);
    background: var(--blog-surface);
}

.post-header {
    padding-bottom: 32px;
    border-bottom: 1px solid var(--blog-line);
}

.post-header h1 {
    font-size: clamp(2rem, 5vw, 3.8rem);
}

.post-summary {
    margin-top: 20px;
    font-size: 1.05rem;
}

.post-lead-image {
    display: block;
    width: 100%;
    height: auto;
    margin: 28px auto 0;
}

.post-body {
    padding-top: 38px;
}

.post-body > :first-child {
    margin-top: 0;
}

.post-body h2,
.post-body h3,
.post-body h4 {
    margin: 2em 0 .65em;
    line-height: 1.35;
}

.post-body p,
.post-body ul,
.post-body ol,
.post-body blockquote {
    margin: 1.1em 0;
}

.post-body img {
    max-width: 100%;
    height: auto;
}

.post-body pre {
    overflow-x: auto;
    padding: 18px;
    background: var(--blog-teal-soft);
}

.post-body code {
    padding: .12em .3em;
    background: var(--blog-teal-soft);
}

.post-body pre code {
    padding: 0;
    background: transparent;
}

.post-body blockquote {
    padding: 4px 20px;
    border-left: 3px solid var(--blog-teal);
    color: var(--blog-muted);
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    margin-top: 42px;
    padding-top: 18px;
    border-top: 1px solid var(--blog-line);
    color: var(--blog-muted);
    font-size: .86rem;
}

.post-meta p {
    margin: 0;
}

.post-meta span {
    margin-right: 6px;
    color: var(--blog-ink);
    font-weight: 700;
}

@media (max-width: 640px) {
    .blog-shell {
        width: min(100% - 28px, 900px);
        padding-top: 28px;
    }

    .blog-header {
        padding: 56px 0 30px;
    }

    .post-card {
        padding: 22px 20px;
    }

    .post-article {
        margin-top: 38px;
        padding: 24px 20px;
    }
}