/* ============================================
   VERLINGO BLOG — styles (uses tokens from styles.css)
   ============================================ */

/* ===== Blog hero ===== */
.blog-hero {
  padding: 84px 0 56px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(700px 320px at 80% 0%, rgba(34, 211, 238, 0.08), transparent 65%),
    var(--paper);
}
.blog-hero::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-hairline), transparent);
}
.blog-hero-inner {
  max-width: 720px;
}
.blog-hero h1 {
  font-size: clamp(40px, 5vw, 68px);
  font-weight: 560;
  letter-spacing: -0.04em;
  line-height: 1.0;
  margin-top: 20px;
}
.blog-hero h1 .accent { color: var(--cyan-2); }
.blog-hero p {
  margin-top: 22px;
  font-size: 19px;
  line-height: 1.5;
  color: var(--mute);
  max-width: 56ch;
  text-wrap: pretty;
}

/* ===== Category filter row ===== */
.blog-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 36px;
}
.blog-filter {
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: white;
  font-size: 14px;
  font-weight: 450;
  color: var(--mute);
  letter-spacing: -0.01em;
  transition: all .18s ease;
  cursor: pointer;
}
.blog-filter:hover { color: var(--ink); border-color: var(--ink); }
.blog-filter.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* ===== Featured post ===== */
.blog-featured {
  padding: 64px 0 0;
}
.featured-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  background: white;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform .25s ease, box-shadow .25s ease;
}
.featured-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset, 0 32px 64px -24px rgba(10,10,11,0.2);
}
.featured-visual {
  position: relative;
  min-height: 380px;
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(34,211,238,0.18), transparent 60%),
    linear-gradient(160deg, var(--ink) 0%, #14141A 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.featured-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 80% at center, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at center, black 20%, transparent 80%);
}
/* Decorative chat/voice glyph in featured visual */
.fv-orb {
  position: relative;
  width: 150px; height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34,211,238,0.35), rgba(34,211,238,0) 70%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.fv-orb::before, .fv-orb::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(34,211,238,0.4);
  animation: fvPulse 3s ease-out infinite;
}
.fv-orb::after { animation-delay: 1.5s; }
@keyframes fvPulse {
  0% { transform: scale(0.7); opacity: 1; }
  100% { transform: scale(1.5); opacity: 0; }
}
.fv-core {
  width: 64px; height: 64px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--cyan), var(--cyan-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  box-shadow: 0 0 40px rgba(34,211,238,0.6);
  z-index: 1;
}
.fv-core svg { width: 30px; height: 30px; }
.featured-body {
  padding: 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.featured-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan-2);
  background: var(--cyan-soft);
  border: 1px solid var(--cyan-hairline);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.featured-body h2 {
  font-size: clamp(26px, 2.6vw, 36px);
  font-weight: 540;
  letter-spacing: -0.03em;
  line-height: 1.08;
}
.featured-body p {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.55;
  color: var(--mute);
  text-wrap: pretty;
}
.featured-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.author-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  flex-shrink: 0;
}
.featured-meta .author-info { display: flex; flex-direction: column; gap: 1px; }
.featured-meta .author-info strong { font-size: 14px; font-weight: 500; }
.featured-meta .author-info span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  letter-spacing: 0.04em;
}
.featured-read {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}
.featured-read svg { width: 15px; height: 15px; transition: transform .2s ease; }
.featured-card:hover .featured-read svg { transform: translateX(3px); }

/* ===== Post grid ===== */
.blog-grid-section { padding: 72px 0 120px; }
.blog-grid-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 36px;
}
.blog-grid-head h3 {
  font-size: 24px;
  font-weight: 540;
  letter-spacing: -0.025em;
}
.blog-grid-head .count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mute);
  letter-spacing: 0.04em;
}
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.post-card {
  display: flex;
  flex-direction: column;
  background: white;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-hairline);
  box-shadow: 0 20px 40px -20px rgba(10,10,11,0.18);
}
.post-thumb {
  height: 180px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.post-thumb svg.thumb-icon { width: 46px; height: 46px; position: relative; z-index: 1; }
.post-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 80% 80% at center, black 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at center, black 10%, transparent 75%);
}
.thumb-cyan   { background: linear-gradient(150deg, #0E1A1D, #06343B); color: var(--cyan); }
.thumb-indigo { background: linear-gradient(150deg, #14141F, #1E1B45); color: #A5B4FC; }
.thumb-ink    { background: linear-gradient(150deg, #14141A, #26262E); color: var(--cyan); }
.thumb-emerald{ background: linear-gradient(150deg, #0E1A14, #103A2A); color: #6EE7B7; }
.thumb-amber  { background: linear-gradient(150deg, #1F1810, #3A2A10); color: #FCD34D; }
.thumb-rose   { background: linear-gradient(150deg, #1F1016, #45132B); color: #FDA4C0; }
.post-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.post-cat {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan-2);
  margin-bottom: 12px;
}
.post-card h4 {
  font-size: 19px;
  font-weight: 540;
  letter-spacing: -0.02em;
  line-height: 1.22;
  color: var(--ink);
}
.post-card p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--mute);
  text-wrap: pretty;
}
.post-foot {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  padding-top: 20px;
}
.post-foot .author-avatar { width: 28px; height: 28px; font-size: 11px; }
.post-foot .pf-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  letter-spacing: 0.02em;
}
.post-foot .pf-meta strong { color: var(--ink); font-weight: 500; }

/* ===== Newsletter band ===== */
.blog-news {
  background:
    radial-gradient(700px 300px at 50% 0%, rgba(34,211,238,0.10), transparent 60%),
    var(--ink);
  color: var(--paper);
  border-radius: 28px;
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ink-2);
}
.blog-news::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
}
.blog-news-inner { position: relative; z-index: 1; max-width: 540px; margin: 0 auto; }
.blog-news h3 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 540;
  letter-spacing: -0.03em;
  color: var(--paper);
}
.blog-news h3 .accent { color: var(--cyan); }
.blog-news p {
  margin-top: 14px;
  color: rgba(244,244,240,0.65);
  font-size: 16px;
}
.news-form {
  display: flex;
  gap: 10px;
  margin-top: 28px;
  max-width: 440px;
  margin-left: auto;
  margin-right: auto;
}
.news-form input {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 999px;
  padding: 14px 20px;
  color: var(--paper);
  font: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color .15s ease, background .15s ease;
}
.news-form input::placeholder { color: rgba(244,244,240,0.4); }
.news-form input:focus { border-color: var(--cyan); background: rgba(255,255,255,0.08); }
.news-foot {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(244,244,240,0.45);
}

/* ===== Article page ===== */
.article-head {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.article-head .container {
  max-width: 1100px;
  padding: 0 32px;
}
.article-head h1 {
  font-size: clamp(36px, 4.8vw, 60px);
  font-weight: 560;
  letter-spacing: -0.04em;
  line-height: 1.04;
  max-width: 18ch;
}
.article-head .standfirst {
  margin-top: 22px;
  font-size: 20px;
  line-height: 1.5;
  color: var(--mute);
  text-wrap: pretty;
  max-width: 60ch;
}
.article-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.article-breadcrumb a { color: var(--mute); transition: color .15s ease; }
.article-breadcrumb a:hover { color: var(--cyan-2); }
.article-breadcrumb svg { width: 13px; height: 13px; }
.article-cat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan-2);
  background: var(--cyan-soft);
  border: 1px solid var(--cyan-hairline);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.article-byline {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 32px;
}
.article-byline .author-avatar { width: 46px; height: 46px; font-size: 15px; }
.article-byline .ab-info { display: flex; flex-direction: column; gap: 2px; }
.article-byline .ab-info strong { font-size: 15px; font-weight: 500; }
.article-byline .ab-info span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
  letter-spacing: 0.03em;
}
.article-share {
  margin-left: auto;
  display: flex;
  gap: 8px;
}
.article-share a {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--mute);
  transition: all .15s ease;
}
.article-share a:hover { color: var(--cyan-2); border-color: var(--cyan-hairline); background: var(--cyan-soft); }
.article-share svg { width: 16px; height: 16px; }

/* Article hero banner */
.article-banner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 36px 32px 0;
}
.article-banner-slot {
  display: block;
  width: 100%;
  height: 440px;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

/* Article body — typographic flow */
.article-body {
  padding: 56px 0 80px;
}
.article-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 64px;
  align-items: start;
}
.article-content {
  max-width: 720px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-2);
  letter-spacing: -0.011em;
}
.article-content > * + * { margin-top: 26px; }
.article-content h2 {
  font-size: 30px;
  font-weight: 560;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-top: 52px;
  line-height: 1.15;
  scroll-margin-top: 90px;
}
.article-content h3 {
  font-size: 22px;
  font-weight: 560;
  letter-spacing: -0.022em;
  color: var(--ink);
  margin-top: 40px;
  scroll-margin-top: 90px;
}
.article-content p { color: var(--ink-2); }
.article-content a {
  color: var(--cyan-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.article-content strong { color: var(--ink); font-weight: 600; }
.article-content ul, .article-content ol {
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.article-content li { padding-left: 6px; }
.article-content li::marker { color: var(--cyan-2); }
.article-content blockquote {
  margin: 40px 0;
  padding: 8px 0 8px 28px;
  border-left: 3px solid var(--cyan);
  font-size: 24px;
  font-weight: 480;
  letter-spacing: -0.025em;
  line-height: 1.4;
  color: var(--ink);
  font-family: var(--font-sans);
}
.article-content blockquote cite {
  display: block;
  margin-top: 14px;
  font-size: 14px;
  font-style: normal;
  font-family: var(--font-mono);
  color: var(--mute);
  letter-spacing: 0.02em;
}
.article-content figure { margin: 40px 0; }
.article-content figure .fig-box {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--ink), #14141A);
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.article-content figure .fig-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse 80% 80% at center, black 10%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at center, black 10%, transparent 80%);
}
.article-content figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
  text-align: center;
  letter-spacing: 0.02em;
}
.article-content .callout {
  background: var(--cyan-soft);
  border: 1px solid var(--cyan-hairline);
  border-radius: var(--r-lg);
  padding: 24px 26px;
  margin: 40px 0;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.article-content .callout svg {
  width: 22px; height: 22px;
  color: var(--cyan-2);
  flex-shrink: 0;
  margin-top: 2px;
}
.article-content .callout p { margin: 0; font-size: 16px; color: var(--ink-2); }
.article-content .callout strong { color: var(--ink); }
.article-content hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 48px 0;
}
.article-content .lead {
  font-size: 21px;
  line-height: 1.55;
  color: var(--ink);
  font-weight: 450;
}

/* Sticky TOC sidebar */
.article-toc {
  position: sticky;
  top: 92px;
}
.article-toc .toc-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 16px;
}
.article-toc ul {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line);
}
.article-toc a {
  display: block;
  padding: 7px 0 7px 16px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  color: var(--mute);
  line-height: 1.4;
  transition: color .15s ease, border-color .15s ease;
}
.article-toc a:hover { color: var(--ink); }
.article-toc a.active {
  color: var(--cyan-2);
  border-left-color: var(--cyan);
  font-weight: 500;
}
.toc-progress {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.toc-progress-bar {
  height: 4px;
  background: var(--paper-3);
  border-radius: 999px;
  overflow: hidden;
}
.toc-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-2));
  border-radius: 999px;
  transition: width .1s linear;
}
.toc-progress-label {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  letter-spacing: 0.04em;
}

/* Article footer: tags + author bio + related */
.article-foot {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 32px 0;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.article-tag {
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-2);
  transition: all .15s ease;
}
.article-tag:hover { border-color: var(--cyan-hairline); color: var(--cyan-2); }
.author-bio {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}
.author-bio .author-avatar { width: 64px; height: 64px; font-size: 22px; flex-shrink: 0; }
.author-bio .bio-text h4 { font-size: 18px; font-weight: 540; letter-spacing: -0.02em; }
.author-bio .bio-text .bio-role {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-2);
  letter-spacing: 0.04em;
  margin-top: 2px;
}
.author-bio .bio-text p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--mute);
}

/* Related posts */
.related {
  padding: 80px 0 120px;
  background: var(--paper-2);
  border-top: 1px solid var(--line);
}
.related h3 {
  font-size: 24px;
  font-weight: 540;
  letter-spacing: -0.025em;
  margin-bottom: 32px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .featured-card { grid-template-columns: 1fr; }
  .featured-visual { min-height: 240px; }
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; gap: 0; }
  .article-toc { display: none; }
}
@media (max-width: 680px) {
  .blog-grid { grid-template-columns: 1fr; }
  .featured-body { padding: 28px; }
  .blog-news { padding: 48px 24px; }
  .news-form { flex-direction: column; }
  .news-form .btn { justify-content: center; }
  .article-content { font-size: 17px; }
  .article-share { display: none; }
}