main {
  position: relative;
  z-index: 2;
  background: var(--bg);
  border-radius: 0 0 28px 28px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.18);
  overflow: clip;
}

.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, #125bff, #7b5cfa);
  z-index: 200;
  transition: width 0.1s linear;
}

.article-hero {
  position: relative;
  height: 72vh;
  min-height: 480px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}
.article-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.04);
  transition: transform 8s ease-out;
}
.article-hero__img.loaded { transform: scale(1); }
.article-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(5,7,22,0.08) 0%,
    rgba(5,7,22,0.30) 45%,
    rgba(5,7,22,0.82) 100%
  );
}
.article-hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: calc(var(--max) + var(--pad) * 2);
  margin: 0 auto;
  padding: 0 var(--pad) 4.5rem;
}
.article-hero__cat {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.95);
  background: rgba(18,91,255,0.82);
  backdrop-filter: blur(8px);
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  margin-bottom: 1.4rem;
  border: 1px solid rgba(255,255,255,0.2);
}
.article-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4.5vw, 4rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.08;
  letter-spacing: -0.04em;
  max-width: 20ch;
  text-shadow: 0 2px 24px rgba(0,0,0,0.25);
}

.article-meta-bar {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
}
.article-meta-bar__inner {
  max-width: calc(var(--max) + var(--pad) * 2);
  margin: 0 auto;
  padding: 1.4rem var(--pad);
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.article-meta-bar__author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.article-meta-bar__avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #125bff, #7b5cfa);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.article-meta-bar__name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}
.article-meta-bar__role {
  font-size: 0.75rem;
  color: var(--text-subtle);
  font-family: var(--font-mono);
}
.article-meta-bar__sep {
  width: 1px; height: 28px;
  background: var(--border);
  flex-shrink: 0;
}
.article-meta-bar__stat {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  color: var(--text-subtle);
}
.article-meta-bar__stat strong {
  color: var(--text);
  font-weight: 500;
}
.article-meta-bar__share {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.article-meta-bar__share-btn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-subtle);
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  transition: color var(--t1), border-color var(--t1), background var(--t1);
}
.article-meta-bar__share-btn:hover {
  color: #125bff;
  border-color: #125bff;
  background: rgba(18,91,255,0.05);
}

.article-layout {
  background: var(--bg);
  padding: 5rem 0 10rem;
}
.article-layout__grid {
  max-width: calc(var(--max) + var(--pad) * 2);
  margin: 0 auto;
  padding: 0 var(--pad);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 6rem;
  align-items: start;
}

.article-body {
  min-width: 0;
}
.article-body__intro {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.2rem, 1.8vw, 1.45rem);
  line-height: 1.65;
  color: var(--text);
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}
.article-body p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 1.6rem;
}
.article-body h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2.2vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-top: 4rem;
  margin-bottom: 1.25rem;
  padding-left: 1.1rem;
  border-left: 3px solid #125bff;
}
.article-body h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-top: 2.5rem;
  margin-bottom: 0.85rem;
}
.article-body blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  line-height: 1.5;
  color: var(--text);
  margin: 3.5rem calc(-1 * var(--pad) / 2);
  padding: 2.5rem 3rem;
  background: linear-gradient(135deg, rgba(18,91,255,0.05) 0%, rgba(123,92,250,0.04) 100%);
  border-radius: var(--r-card);
  border-left: 4px solid #125bff;
  position: relative;
}
.article-body blockquote::before {
  content: '\201C';
  position: absolute;
  top: -0.5rem;
  left: 2rem;
  font-size: 5rem;
  line-height: 1;
  color: #125bff;
  opacity: 0.18;
  font-family: var(--font-serif);
}
.article-body ul {
  list-style: none;
  margin-bottom: 1.6rem;
}
.article-body ul li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 0.6rem;
}
.article-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #125bff;
}
.article-body .highlight-box {
  background: var(--bg-white);
  border-radius: var(--r-card);
  padding: 2rem 2.25rem;
  margin: 2.5rem 0;
  border: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(10,20,80,0.06);
}
.article-body .highlight-box__title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #125bff;
  margin-bottom: 0.85rem;
}
.article-body .highlight-box p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.article-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 2rem);
}
.article-sidebar__toc {
  background: var(--bg-white);
  border-radius: var(--r-card);
  padding: 1.75rem;
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}
.article-sidebar__toc-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: 1.1rem;
}
.article-sidebar__toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.article-sidebar__toc-link {
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--text-subtle);
  transition: color var(--t1);
  display: block;
  padding: 0.1rem 0;
}
.article-sidebar__toc-link:hover,
.article-sidebar__toc-link.active { color: #125bff; }
.article-sidebar__cta {
  background: linear-gradient(135deg, var(--bg-darkest) 0%, #0d1340 100%);
  border-radius: var(--r-card);
  padding: 2rem;
  color: #fff;
}
.article-sidebar__cta-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.85rem;
}
.article-sidebar__cta h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  line-height: 1.25;
}
.article-sidebar__cta p {
  font-size: 0.85rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.65);
  margin-bottom: 1.5rem;
}
.article-sidebar__cta-btn {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--bg-darkest);
  background: #fff;
  padding: 0.65rem 1.4rem;
  border-radius: 100px;
  transition: background var(--t1), transform var(--t2) var(--ease);
}
.article-sidebar__cta-btn:hover {
  background: #e8ebff;
  transform: translateY(-1px);
}

.article-related {
  background: var(--bg-white);
  padding: 7rem 0;
}
.article-related__inner {
  max-width: calc(var(--max) + var(--pad) * 2);
  margin: 0 auto;
  padding: 0 var(--pad);
}
.article-related__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 3.5rem;
}
.article-related__heading {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}
.article-related__heading em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
}
.article-related__all {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-subtle);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color var(--t1), border-color var(--t1);
  white-space: nowrap;
}
.article-related__all:hover { color: #125bff; border-color: #125bff; }
.article-related__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.back-to-top {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--bg-darkest);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t2), transform var(--t2) var(--ease);
  z-index: 50;
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
  border: none;
  cursor: pointer;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
}
.back-to-top:hover { transform: translateY(-3px); }

@media (max-width: 900px) {
  .article-layout__grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .article-related__grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 600px) {
  .article-hero { height: 55vh; }
  .article-hero__title { font-size: clamp(1.7rem, 7vw, 2.5rem); }
  .article-meta-bar__share { display: none; }
  .article-body blockquote { margin-left: 0; margin-right: 0; }
  .article-sidebar { grid-template-columns: 1fr; }
}