/* ============================================================
   blog.css — blog index + article. Dark theme, Inter, reuses
   the design-system tokens from colors_and_type.css.
   ============================================================ */

.blog {
  /* clear the fixed header */
  padding-top: calc(var(--header-h) + clamp(32px, 6vw, 80px));
  min-height: 100vh;
}
.blog .section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

/* ---------------- index header ---------------- */
.blog-head {
  margin-bottom: clamp(36px, 5vw, 60px);
  text-align: center;
}
.blog-crumbs {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-nav);
  color: var(--c-fg-dim);
}
.blog-crumbs a {
  color: var(--c-fg-dim);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.blog-crumbs a:hover { color: var(--c-fg); }
.blog-crumb-sep { color: var(--c-fg-mute); }
.blog-crumb-current { color: var(--c-accent); }
.blog-title {
  font-family: var(--ff-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-snug);
  color: var(--c-fg);
  margin-top: 22px;
}
.blog-title em { font-style: italic; font-weight: 800; color: var(--c-accent); }
.blog-sub {
  margin: 20px auto 0;
  max-width: 60ch;
  font-size: var(--fs-lead);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--c-fg-dim);
}
.blog-demo-note {
  display: inline-block;
  margin-top: 20px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-soft);
  border: 1px solid var(--c-accent-glow);
  border-radius: var(--r-pill);
  padding: 8px 16px;
}

/* ---------------- tag filter ---------------- */
.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 44px);
}
.blog-chip {
  font-family: var(--ff);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-fg-dim);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-pill);
  padding: 9px 18px;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease),
              background .2s var(--ease), transform .2s var(--ease);
}
.blog-chip:hover { color: var(--c-fg); border-color: var(--c-hairline-strong); }
.blog-chip.is-active {
  color: var(--c-fg);
  background: var(--c-accent-soft);
  border-color: var(--c-accent-glow);
}

/* ---------------- card grid ---------------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2vw, 28px);
}
@media (max-width: 1000px) { .blog-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .blog-grid { grid-template-columns: 1fr; } }

.blog-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--c-card-stroke);
  border-radius: 22px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
  text-decoration: none;
  color: inherit;
  transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}
.blog-card:hover {
  border-color: var(--c-accent-glow);
  transform: translateY(-3px);
  background: linear-gradient(180deg, rgba(122,78,224,0.10), rgba(255,255,255,0.02));
}
.blog-card-cover {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--c-bg-soft);
}
.blog-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s var(--ease);
}
.blog-card:hover .blog-card-cover img { transform: scale(1.04); }
.blog-card-cover--empty {
  width: 100%; height: 100%;
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(122,78,224,0.20), transparent 60%),
    var(--c-bg-soft);
}
.blog-card-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 22px 22px;
  flex: 1;
}
.blog-card-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--c-accent);
  background: var(--c-accent-soft);
  border-radius: var(--r-pill);
  padding: 5px 11px;
}
/* tag pill sitting on the cover, bottom-left */
.blog-card-tag--overlay {
  position: absolute;
  left: 16px;
  bottom: 16px;
  color: var(--c-fg);
  background: rgba(11, 11, 12, 0.55);
  border: 1px solid var(--c-accent-glow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-fg-dim);
}
.blog-card-dot { color: var(--c-fg-mute); }
.blog-card-title {
  font-family: var(--ff-display);
  font-size: clamp(20px, 1.6vw, 24px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--c-fg);
}
.blog-card-excerpt {
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-fg-dim);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.blog-card-foot {
  margin-top: auto;
  padding-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.blog-card-author {
  font-size: 13px;
  color: var(--c-fg-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.blog-card-read {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-accent);
  transition: transform .2s var(--ease);
}
.blog-card:hover .blog-card-read { transform: translateX(2px); }

/* ---------------- states ---------------- */
.blog-notice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 28px 0;
  color: var(--c-fg-dim);
  font-size: 15px;
}
.blog-notice .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--c-accent);
}
.blog-notice--error .dot { background: #e0564e; }

/* ============================================================
   ARTICLE
   ============================================================ */
.article-inner { max-width: 760px; }

.article-back {
  display: inline-block;
  font-size: 14px;
  color: var(--c-fg-dim);
  text-decoration: none;
  margin-bottom: 28px;
  transition: color .2s var(--ease);
}
.article-back:hover { color: var(--c-fg); }

.article-head { margin-bottom: 36px; }
.article-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.article-title {
  font-family: var(--ff-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: var(--tracking-snug);
  color: var(--c-fg);
}
.article-title em { font-style: italic; font-weight: 800; color: var(--c-accent); }
.article-excerpt {
  margin-top: 20px;
  font-size: var(--fs-lead);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--c-fg-dim);
}
.article-byline {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--c-hairline);
}
.article-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--c-hairline);
}
.article-byline-text { display: flex; flex-direction: column; gap: 3px; }
.article-author { font-size: 15px; font-weight: 600; color: var(--c-fg); }
.article-role { font-weight: 400; color: var(--c-fg-dim); }
.article-meta { font-size: 13px; color: var(--c-fg-dim); }

.article-cover {
  margin: 8px 0 40px;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--c-card-stroke);
}
.article-cover img { width: 100%; display: block; }

/* ---------------- portable text body ---------------- */
.article-content { margin-top: 8px; }
.pt-body { color: var(--c-fg); }
.pt-p {
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--c-fg);
  margin: 0 0 22px;
}
.pt-body > .pt-h2,
.pt-body > .pt-h3,
.pt-body > .pt-h4 {
  font-family: var(--ff-display);
  color: var(--c-fg);
  letter-spacing: -0.015em;
  line-height: 1.2;
}
.pt-h2 { font-size: clamp(26px, 3vw, 36px); font-weight: 700; margin: 44px 0 18px; }
.pt-h3 { font-size: clamp(21px, 2.2vw, 27px); font-weight: 600; margin: 36px 0 14px; }
.pt-h4 { font-size: clamp(18px, 1.8vw, 21px); font-weight: 600; margin: 28px 0 12px; }

.pt-quote {
  margin: 32px 0;
  padding: 6px 0 6px 26px;
  border-left: 3px solid var(--c-accent);
  font-family: var(--ff-display);
  font-size: clamp(20px, 2.2vw, 26px);
  font-style: italic;
  font-weight: 500;
  line-height: 1.4;
  color: var(--c-fg);
}

.pt-ul, .pt-ol { margin: 0 0 22px; padding-left: 26px; }
.pt-li {
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--c-fg);
  margin-bottom: 10px;
}
.pt-ul .pt-li::marker { color: var(--c-accent); }
.pt-ol .pt-li::marker { color: var(--c-accent); font-weight: 600; }

.pt-link {
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--c-accent-glow);
  transition: border-color .2s var(--ease);
}
.pt-link:hover { border-bottom-color: var(--c-accent); }

.pt-body code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.88em;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-2);
  padding: 2px 6px;
}

.pt-figure { margin: 32px 0; }
.pt-figure img {
  width: 100%;
  display: block;
  border-radius: 14px;
  border: 1px solid var(--c-card-stroke);
}
.pt-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--c-fg-dim);
  text-align: center;
}