/* ══════════════════════════════════════════════
   blog.css — ブログページ共通スタイル
   (blog/index.html & blog/post.html で使用)
   ══════════════════════════════════════════════ */

/* ── CSS Variables ── */
:root {
  --color-bg: #000000;
  --color-bg-alt: #0A0A0A;
  --color-card: #111111;
  --color-text: #EDEDED;
  --color-text-sub: #A1A1A1;
  --color-text-muted: #666666;
  --color-border: #333333;
  --color-border-light: #222222;
  --color-accent: #4285F4;
  --font-serif: 'Cormorant', 'Noto Serif JP', serif;
  --font-sans: 'Inter', 'Noto Sans JP', sans-serif;
  --font-jp: 'Noto Sans JP', sans-serif;
  --font-en: 'Inter', sans-serif;
  --container-max: 1024px;
  --content-max:   800px;
  --blog-font-size: 15px;
  --container-padding: 40px;
}

:root[data-theme="light"] {
  --color-bg: #F8F8F8;
  --color-bg-alt: #F0F0F0;
  --color-card: #FFFFFF;
  --color-text: #111111;
  --color-text-sub: #555555;
  --color-text-muted: #999999;
  --color-border: rgba(0, 0, 0, 0.12);
  --color-border-light: rgba(0, 0, 0, 0.06);
  --color-accent: #2B6BD6;
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* ── Site Background ── */
.site-bg {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: var(--color-bg);
}

/* ── Header ── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 24px var(--container-padding); background: var(--color-bg);
}
.header-inner {
  max-width: var(--container-max); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
}
.logo {
  font-family: var(--font-serif); font-size: 13px; font-weight: 400;
  letter-spacing: .1em; color: var(--color-text); text-decoration: none;
}
.header-right { display: flex; align-items: center; gap: 16px; }
.header-nav { display: flex; gap: 32px; }
.header-nav a {
  font-family: var(--font-serif); font-size: 12px; font-weight: 400;
  letter-spacing: .05em; color: var(--color-text); text-decoration: none;
  transition: opacity .3s ease;
}
.header-nav a:hover { opacity: .7; }

/* ── Theme Toggle ── */
.theme-toggle {
  background: none; border: 1px solid var(--color-border); border-radius: 50%;
  width: 32px; height: 32px; cursor: pointer; font-size: 14px; line-height: 1;
  color: var(--color-text); display: flex; align-items: center; justify-content: center;
  transition: border-color .3s, opacity .3s;
}
.theme-toggle:hover { opacity: .7; }

/* ── Hamburger (desktop hidden) ── */
.header-hamburger {
  display: none; flex-direction: column; justify-content: center; align-items: center;
  gap: 6px; width: 30px; height: 30px; background: none; border: none;
  cursor: pointer; padding: 0; position: relative; z-index: 101;
}
.header-hamburger span {
  display: block; width: 30px; height: 2px; background: var(--color-text);
  transform-origin: center; transition: transform .3s ease, opacity .3s ease;
}
.header-hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.header-hamburger.active span:nth-child(2) { opacity: 0; }
.header-hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ── Main ── */
.main {
  position: relative; z-index: 1;
  padding-top: 88px; min-height: 100vh;
}

/* ── Page Hero (blog index) ── */
.page-hero { padding: 80px var(--container-padding) 56px; max-width: var(--container-max); margin: 0 auto; }
.page-label { font-family: var(--font-serif); font-size: 11px; letter-spacing: .25em; color: var(--color-text-muted); text-transform: uppercase; margin-bottom: 16px; }
.page-title { font-family: var(--font-serif); font-size: clamp(56px, 10vw, 96px); font-weight: 500; letter-spacing: -.01em; line-height: 1; color: var(--color-text); }

/* ── Blog Section / Grid / Cards ── */
.blog-section { padding: 0 var(--container-padding) 128px; max-width: var(--container-max); margin: 0 auto; }
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 32px; }
.blog-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--color-card); border: 1px solid var(--color-border-light);
  border-radius: 12px; overflow: hidden;
  transition: border-color .3s ease, transform .3s ease;
}
.blog-card:hover { border-color: var(--color-border); transform: translateY(-4px); }
.blog-card-thumb { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; background: var(--color-bg-alt); }
.blog-card-thumb-placeholder { width: 100%; aspect-ratio: 16/9; background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-card) 100%); }
.blog-card-body { padding: 24px; }
.blog-card-date { font-family: var(--font-sans); font-size: 11px; letter-spacing: .1em; color: var(--color-text-muted); margin-bottom: 10px; }
.blog-card-title { font-family: var(--font-serif); font-size: clamp(20px, 2.5vw, 26px); font-weight: 500; line-height: 1.3; color: var(--color-text); margin-bottom: 12px; letter-spacing: .02em; }
.blog-card-excerpt { font-family: var(--font-sans); font-size: 13px; line-height: 1.7; color: var(--color-text-sub); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ── Skeleton Loading ── */
.skeleton-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 32px; }
.skeleton-card { background: var(--color-card); border: 1px solid var(--color-border-light); border-radius: 12px; overflow: hidden; }
.skeleton-thumb { width: 100%; aspect-ratio: 16/9; background: var(--color-bg-alt); animation: shimmer 1.5s ease-in-out infinite; }
.skeleton-body { padding: 24px; display: flex; flex-direction: column; gap: 12px; }
.skeleton-line { height: 12px; border-radius: 4px; background: var(--color-bg-alt); animation: shimmer 1.5s ease-in-out infinite; }
.skeleton-line--short { width: 40%; }
.skeleton-line--title { height: 20px; width: 85%; }
.skeleton-line--text { width: 70%; }
@keyframes shimmer { 0%,100%{opacity:.4} 50%{opacity:.9} }
.blog-empty { padding: 80px 0; text-align: center; }
.blog-empty-text { font-family: var(--font-serif); font-size: 16px; color: var(--color-text-muted); }

/* ── Loading Dots (post page) ── */
.loading {
  padding: 120px var(--container-padding); text-align: center;
}
.loading-dot {
  display: inline-flex; gap: 8px; align-items: center;
}
.loading-dot span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-text-muted);
  animation: dotPulse 1.4s ease-in-out infinite;
}
.loading-dot span:nth-child(2) { animation-delay: .2s; }
.loading-dot span:nth-child(3) { animation-delay: .4s; }
@keyframes dotPulse {
  0%,80%,100%{opacity:.2;transform:scale(.8)} 40%{opacity:1;transform:scale(1)}
}

/* ── Error State (post page) ── */
.error-state {
  padding: 120px var(--container-padding); text-align: center;
  max-width: var(--container-max); margin: 0 auto;
}
.error-code {
  font-family: var(--font-serif);
  font-size: clamp(64px, 12vw, 120px);
  font-weight: 500; letter-spacing: -.02em;
  color: var(--color-text-muted); line-height: 1; margin-bottom: 16px;
}
.error-message {
  font-family: var(--font-serif); font-size: 16px;
  color: var(--color-text-sub); margin-bottom: 40px;
}
.back-link {
  font-family: var(--font-serif); font-size: 13px;
  letter-spacing: .1em; color: var(--color-text-sub); text-decoration: none;
  border-bottom: 1px solid var(--color-border); padding-bottom: 2px;
  transition: color .2s, border-color .2s;
}
.back-link:hover { color: var(--color-text); border-color: var(--color-text); }

/* ── Cover Image (post page) ── */
.post-cover {
  width: 100%; height: 400px; object-fit: cover; display: block;
}

/* ── Post Header ── */
.post-header {
  max-width: var(--content-max); margin: 0 auto; padding: 64px 40px 40px;
}
.post-meta {
  display: flex; align-items: center; gap: 16px; margin-bottom: 20px;
}
.post-back {
  font-family: var(--font-sans); font-size: 12px;
  letter-spacing: .05em; color: var(--color-text-muted); text-decoration: none;
  transition: color .2s;
}
.post-back:hover { color: var(--color-text-sub); }
.post-meta-sep { font-size: 12px; color: var(--color-border); }
.post-date {
  font-family: var(--font-sans); font-size: 12px;
  letter-spacing: .08em; color: var(--color-text-muted);
}
.post-title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 500; letter-spacing: -.01em;
  line-height: 1.15; color: var(--color-text);
}

/* ── Post Divider ── */
.post-divider {
  max-width: var(--content-max); margin: 0 auto 8px;
  padding: 0 40px; border: none;
  border-top: 1px solid var(--color-border);
}

/* ── Blog Content ── */
.blog-content { max-width: var(--content-max); margin: 0 auto; padding: 80px 40px; }

.blog-h1 {
  font-family: 'Cormorant', serif; font-size: clamp(36px,5vw,56px);
  font-weight: 500; margin: 2em 0 .5em; color: var(--color-text);
}
.blog-h2 {
  font-family: 'Cormorant', serif; font-size: clamp(26px,3.5vw,36px);
  font-weight: 500; margin: 1.8em 0 .5em; color: var(--color-text);
}
.blog-h3 {
  font-family: 'Cormorant', serif; font-size: clamp(20px,2.5vw,26px);
  font-weight: 400; margin: 1.5em 0 .4em; color: var(--color-text);
}
.blog-p {
  font-family: 'Inter','Noto Sans JP',sans-serif;
  font-size: var(--blog-font-size, 15px); line-height: 1.9; color: var(--color-text); margin: 0 0 1.2em;
}
.blog-img { margin: 2em 0; }
.blog-img img { width: 100%; height: auto; display: block; }
.blog-img--wide {
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
}
.blog-img figcaption,
.blog-embed figcaption {
  font-size: 12px; color: var(--color-text-muted); margin-top: 8px; text-align: center;
  font-family: 'Inter','Noto Sans JP',sans-serif;
}
.blog-embed { margin: 2em 0; }
.blog-embed-wrap {
  position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;
}
.blog-embed-wrap iframe {
  position: absolute; inset: 0; width: 100%; height: 100%;
}
/* ── YouTube Facade (Lite Embed) ── */
.blog-embed-facade {
  position: relative; width: 100%; aspect-ratio: 16/9;
  cursor: pointer; background: #000; overflow: hidden; border-radius: 4px;
}
.blog-embed-thumb {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; display: block; transition: opacity .2s;
}
.blog-embed-facade:hover .blog-embed-thumb { opacity: .85; }
.blog-embed-play {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: none; border: none; cursor: pointer; padding: 0;
  width: 68px; height: 48px; transition: transform .15s;
}
.blog-embed-facade:hover .blog-embed-play {
  transform: translate(-50%, -50%) scale(1.15);
}
.blog-embed-play svg { width: 68px; height: 48px; display: block; }
.blog-embed-facade picture { display: contents; }

/* ── List ── */
.blog-list {
  font-family: 'Inter','Noto Sans JP',sans-serif;
  font-size: var(--blog-font-size, 15px); line-height: 1.9; color: var(--color-text);
  margin: 0 0 1.2em; padding-left: 1.6em;
}
.blog-list li { margin-bottom: .4em; }

/* ── Quote ── */
.blog-quote {
  margin: 2.2em 0; padding: 20px 28px;
  border: 1px solid var(--color-border); border-left: 3px solid var(--color-text);
  border-radius: 4px; background: var(--color-bg-alt);
}
.blog-quote blockquote {
  font-family: 'Cormorant','Noto Serif JP',serif;
  font-size: clamp(17px,2.2vw,22px); font-style: italic;
  font-weight: 400; color: var(--color-text); line-height: 1.7; margin-bottom: 8px;
}
.blog-quote figcaption {
  font-family: 'Inter','Noto Sans JP',sans-serif;
  font-size: 12px; color: var(--color-text-muted); letter-spacing: .06em;
}

/* ── Delimiter ── */
.blog-delimiter { text-align: center; margin: 2.5em 0; color: var(--color-text-muted); font-size: 18px; letter-spacing: .4em; }
.blog-delimiter--solid {
  border: none; border-top: 1px solid var(--color-border);
  margin: 2.5em 0; display: block; height: 0;
}
.blog-delimiter--dashed {
  border: none; border-top: 1px dashed var(--color-text-muted);
  margin: 2.5em 0; display: block; height: 0;
}

/* ── Table ── */
.blog-table-wrap { margin: 1.8em 0; overflow-x: auto; }
.blog-table {
  width: 100%; border-collapse: collapse;
  font-family: 'Inter','Noto Sans JP',sans-serif;
  font-size: 14px; color: var(--color-text); line-height: 1.7;
}
.blog-table th {
  background: var(--color-bg-alt); color: var(--color-text);
  font-weight: 500; text-align: left;
  padding: 8px 12px;
}
.blog-table td { padding: 8px 12px; }

/* ── Columns (flex) ── */
.blog-columns { display: flex; gap: 16px; margin: 1.6em 0; }
.blog-columns__col {
  flex: 1 1 0; min-width: 0;
  font-family: 'Inter','Noto Sans JP',sans-serif;
  font-size: 15px; line-height: 1.9; color: var(--color-text);
}
@media (max-width: 600px) { .blog-columns { flex-direction: column; } }

.post-end { height: 128px; }

/* ── Footer ── */
.site-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--color-border);
  padding: 64px var(--container-padding) 40px;
}
.site-footer-inner {
  max-width: var(--container-max); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 56px;
}
.footer-logo { display: flex; flex-direction: column; gap: 10px; }
.footer-logo-main {
  font-family: 'Cormorant', serif;
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 500; letter-spacing: -.01em; line-height: 1; color: var(--color-text);
}
.footer-logo-address {
  font-family: 'Inter', sans-serif; font-size: 11px; font-weight: 300;
  letter-spacing: .12em; color: var(--color-text-muted); text-transform: uppercase;
}
.footer-sitemap-title {
  font-family: var(--font-serif); font-size: 11px;
  letter-spacing: .2em; color: var(--color-text-muted);
  text-transform: uppercase; margin-bottom: 16px;
}
.footer-sitemap-links { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 48px; }
.footer-sitemap-links a {
  font-family: var(--font-serif); font-size: 13px;
  color: var(--color-text-sub); text-decoration: none;
  letter-spacing: .05em; transition: color .2s ease;
}
.footer-sitemap-links a:hover { color: var(--color-text); }
.footer-bottom {
  max-width: var(--container-max); margin: 0 auto; padding-top: 24px;
  border-top: 1px solid var(--color-border-light);
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'Noto Sans JP', sans-serif; font-size: 11px;
  color: var(--color-text-muted); letter-spacing: .08em;
}

/* ── Reading Toolbar ── */
.reading-toolbar {
  position: fixed; bottom: 32px; right: 32px; z-index: 50;
  display: flex; align-items: center; gap: 1px;
  background: var(--color-card);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border); border-radius: 10px; padding: 3px;
  box-shadow: 0 4px 24px rgba(0,0,0,.15);
}
.rtb-btn {
  background: none; border: none; cursor: pointer;
  color: var(--color-text-muted); padding: 6px 10px; border-radius: 7px;
  font-family: var(--font-sans); font-size: 12px; font-weight: 500;
  letter-spacing: .05em; line-height: 1; min-width: 32px; text-align: center;
  transition: background .15s, color .15s;
}
.rtb-btn:hover { background: var(--color-bg-alt); color: var(--color-text); }
.rtb-btn:disabled { opacity: .28; cursor: default; pointer-events: none; }

/* ── Responsive ── */
@media (max-width: 768px) {
  :root { --container-padding: 24px; }
  .header { padding: 20px 24px; }
  .header-hamburger { display: flex; }
  .header-nav {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: var(--color-bg); flex-direction: column;
    justify-content: center; align-items: center; gap: 24px;
    z-index: 99; opacity: 0; visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
  }
  .header-nav.open { opacity: 1; visibility: visible; }
  .header-nav a { font-size: 20px; padding: 8px 16px; }
  .theme-toggle { z-index: 101; }
  .blog-grid, .skeleton-grid { grid-template-columns: 1fr; }
  .post-cover { height: 240px; }
  .post-header { padding: 48px 24px 32px; }
  .post-divider { padding: 0 24px; }
  .blog-content { padding: 48px 24px; }
  .blog-img--wide { margin-left: -24px; margin-right: -24px; }
  .site-footer-inner { flex-direction: column; gap: 40px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .reading-toolbar { bottom: 20px; right: 16px; }
}