/*
 * Cosoado Lab — Blog reading style
 *
 * メインサイトの dark glassmorphism と世界観を共有しつつ、
 * 記事は「読みやすさ」を最優先。温かみのある配色と十分な行間・余白で
 * 長文でも目が疲れない設計に。
 */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;700;800&family=Zen+Kaku+Gothic+New:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    /* Warm dark palette — 記事読み専用 */
    --bg: #15141a;              /* 真っ黒より少し温度のある背景 */
    --bg-elevated: #1d1c23;
    --bg-code: #0f0e13;
    --text: #e8e6e1;            /* 白すぎないオフホワイト */
    --text-soft: #b8b4ac;
    --text-muted: #7d7a74;
    --accent: #f7b267;          /* warm amber、読む温度感に合う */
    --accent-soft: rgba(247, 178, 103, 0.15);
    --link: #9ec5ff;            /* メインサイトと揃えた寒色アクセント */
    --link-hover: #c4dcff;
    --border: rgba(255, 255, 255, 0.08);
    --border-soft: rgba(255, 255, 255, 0.04);

    --font-heading: 'Outfit', 'Zen Kaku Gothic New', sans-serif;
    --font-body: 'Zen Kaku Gothic New', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle warm ambient glow in corner */
body::before {
    content: "";
    position: fixed;
    top: -30vh;
    right: -20vh;
    width: 60vh;
    height: 60vh;
    background: radial-gradient(circle, rgba(247, 178, 103, 0.08), transparent 70%);
    pointer-events: none;
    z-index: -1;
}

body::after {
    content: "";
    position: fixed;
    bottom: -30vh;
    left: -20vh;
    width: 50vh;
    height: 50vh;
    background: radial-gradient(circle, rgba(158, 197, 255, 0.06), transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* ─────────────────────────────── header nav */

.site-header {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: var(--font-heading);
}

.site-header__brand {
    color: var(--text);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.02em;
    font-size: 18px;
    transition: opacity 150ms ease-out;
}

.site-header__brand:hover { opacity: 0.75; }

.site-header__nav {
    display: flex;
    gap: 28px;
    font-size: 14px;
}

.site-header__nav a {
    color: var(--text-soft);
    text-decoration: none;
    transition: color 150ms ease-out;
}

.site-header__nav a:hover { color: var(--text); }
.site-header__nav a.is-current { color: var(--accent); }

/* ─────────────────────────────── article */

.article {
    max-width: 720px;
    margin: 24px auto 120px;
    padding: 0 24px;
}

.article__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 20px;
    font-family: var(--font-heading);
}

.article__meta time { color: var(--text-soft); }

.article__title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(28px, 5vw, 42px);
    line-height: 1.25;
    color: var(--text);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.article__lede {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-soft);
    margin-bottom: 40px;
    padding-left: 16px;
    border-left: 3px solid var(--accent);
}

.article__body {
    font-size: 17px;
    line-height: 1.85;
}

/* 見出しは明るめ (#fff 寄り)、段落本体は少し落ち着いた明度にして、
   スキャン時に「声の強弱」を感じられるようにする */
.article__body h2 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 26px;
    line-height: 1.35;
    color: #fafaf8;
    margin: 56px 0 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border-soft);
    letter-spacing: -0.005em;
}

.article__body h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 20px;
    color: #f4f2ed;
    margin: 40px 0 14px;
}

.article__body p {
    margin: 0 0 20px;
    color: #ddd9d1;
}

.article__body strong {
    color: #fff;
    font-weight: 700;
}

.article__body em {
    font-style: normal;
    color: var(--accent);
}

.article__body a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px solid rgba(158, 197, 255, 0.35);
    transition: color 150ms ease-out, border-color 150ms ease-out;
    padding-bottom: 1px;
}

.article__body a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

.article__body ul,
.article__body ol {
    margin: 0 0 24px 24px;
    padding-left: 4px;
}

.article__body li {
    margin-bottom: 10px;
    color: var(--text);
}

.article__body li::marker {
    color: var(--accent);
}

/* 引用ブロックは "余白で語る" を原則に、背景は置かず左ボーダーだけで引く */
.article__body blockquote {
    margin: 36px 0;
    padding: 6px 0 6px 24px;
    border-left: 2px solid var(--accent);
    color: #e8e6e1;
    font-style: normal;
}

.article__body blockquote p {
    margin-bottom: 8px;
    font-size: 17px;
    line-height: 1.75;
    font-weight: 400;
    letter-spacing: 0.005em;
}

.article__body blockquote p:last-child { margin-bottom: 0; }

/* Tables */
.article__body table {
    width: 100%;
    border-collapse: collapse;
    margin: 28px 0;
    font-size: 15px;
}

.article__body th,
.article__body td {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.article__body th {
    font-weight: 700;
    color: var(--text);
    font-family: var(--font-heading);
    border-bottom-color: var(--border);
    font-size: 14px;
    letter-spacing: 0.02em;
}

.article__body td { color: var(--text-soft); }

/* Code */
.article__body code {
    font-family: var(--font-mono);
    font-size: 14px;
    background: var(--accent-soft);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 4px;
}

.article__body pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 28px 0;
    font-size: 13px;
    line-height: 1.6;
}

.article__body pre code {
    background: transparent;
    color: var(--text-soft);
    padding: 0;
    font-size: 13px;
}

/* HR */
.article__body hr {
    border: none;
    border-top: 1px solid var(--border-soft);
    margin: 56px auto;
    max-width: 120px;
}

/* Final author block */
.article__footer {
    margin-top: 80px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    font-size: 14px;
    color: var(--text-soft);
}

.article__footer p {
    margin-bottom: 8px;
}

.article__footer strong {
    color: var(--text);
    font-weight: 600;
}

/* Featured apps card */
.app-card-row {
    display: grid;
    gap: 16px;
    margin: 32px 0;
}

@media (min-width: 640px) {
    .app-card-row { grid-template-columns: repeat(3, 1fr); gap: 12px; }
}

.app-card {
    display: block;
    padding: 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-decoration: none;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94), border-color 200ms ease-out;
}

.app-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.app-card__name {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 18px;
    color: var(--text);
    margin-bottom: 6px;
}

.app-card__desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ─────────────────────────────── blog index */

.blog-index {
    max-width: 760px;
    margin: 24px auto 120px;
    padding: 0 24px;
}

.blog-index__intro {
    margin-bottom: 56px;
}

.blog-index__intro h1 {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(32px, 5vw, 44px);
    margin-bottom: 16px;
    color: var(--text);
}

.blog-index__intro p {
    font-size: 17px;
    color: var(--text-soft);
    max-width: 580px;
}

.post-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.post-list__item {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-soft);
}

.post-list__item:last-child { border-bottom: none; }

.post-list__item time {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    font-family: var(--font-heading);
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.post-list__item h2 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 22px;
    line-height: 1.4;
    margin-bottom: 10px;
}

.post-list__item h2 a {
    color: var(--text);
    text-decoration: none;
    transition: color 200ms ease-out;
}

.post-list__item h2 a:hover {
    color: var(--accent);
}

.post-list__item p {
    color: var(--text-soft);
    font-size: 15px;
    line-height: 1.7;
}

/* ─────────────────────────────── footer */

.site-footer {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px 60px;
    border-top: 1px solid var(--border-soft);
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.site-footer a {
    color: var(--text-soft);
    text-decoration: none;
}

.site-footer a:hover {
    color: var(--text);
}

/* ─────────────────────────────── mobile tweaks */
@media (max-width: 640px) {
    body { font-size: 16px; }
    .article { margin-top: 8px; }
    .article__body { font-size: 16px; }
    .article__body h2 { font-size: 22px; margin-top: 44px; }
    .article__body h3 { font-size: 18px; }
    .article__body pre { padding: 14px 16px; font-size: 12px; }
    .article__body blockquote { padding: 4px 0 4px 16px; }
    .site-header__nav { gap: 18px; }
}

/* ─────────────────────────────── a11y */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}