* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --page-bg: #fafafa;
  --surface: #ffffff;
  --surface-muted: #f0f3ff;
  --surface-subtle: #f7f7f7;
  --text: #171717;
  --text-muted: #2e2e2e;
  --text-soft: #5e5e5e;
  --border: rgba(23, 23, 23, 0.1);
  --shadow: 0 24px 64px rgba(17, 16, 21, 0.08);
  --accent: #428aff;
  --accent-strong: #006ddc;
  --font-sans: var(--font-suisse, "Suisse Intl"), "Suisse Intl", "Helvetica Neue", Arial, sans-serif;
  --article-max-width: 1360px;
  --toc-column: minmax(170px, 1fr);
  --body-column: minmax(0, 3.75fr);
  --cta-column: minmax(340px, 1.8fr);
  --layout-gap: clamp(20px, 2vw, 30px);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(66, 138, 255, 0.12), transparent 30%),
    linear-gradient(180deg, #ffffff 0%, var(--page-bg) 100%);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-strong);
  text-decoration-color: rgba(0, 109, 220, 0.3);
  text-underline-offset: 0.16em;
  transition:
    color 180ms ease,
    text-decoration-color 180ms ease;
}

a:hover {
  color: #0050a6;
  text-decoration-color: currentColor;
}

img {
  display: block;
  max-width: 100%;
}

.article-shell {
  width: min(100%, var(--article-max-width));
  margin: 0 auto;
  padding: clamp(20px, 3vw, 40px) 16px clamp(32px, 5vw, 64px);
  display: grid;
  grid-template-columns: var(--toc-column) var(--body-column) var(--cta-column);
  column-gap: var(--layout-gap);
  align-items: start;
}

.article-header {
  grid-column: 1 / -1;
  width: min(950px, calc(100vw - 36px));
  margin: 0;
  justify-self: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 32px;
  padding: clamp(20px, 3vw, 34px);
  box-shadow: var(--shadow);
}

.article-kicker,
.article-meta,
.figure-caption {
  font-family: var(--font-sans);
}

.article-kicker {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.article-title {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.04em;
  color: var(--text);
}

.article-dek {
  margin: 20px 0 0;
  color: var(--text-soft);
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  font-weight: 400;
  line-height: 1.6;
  max-width: 44rem;
}

.article-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  margin-top: 28px;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.article-meta-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.article-meta span {
  color: var(--text-soft);
  font-family: var(--font-sans);
}

.article-meta-top span + span::before {
  content: "•";
  margin: 0 0.45rem;
}

.article-meta-read-time {
  display: block;
}

.article-hero {
  margin-top: 32px;
  border-radius: 28px;
  overflow: hidden;
}

.article-layout {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: var(--toc-column) var(--body-column) var(--cta-column);
  column-gap: var(--layout-gap);
  align-items: start;
  margin-top: 28px;
}

.article-sidebar {
  position: sticky;
  top: 24px;
}

.article-toc {
  padding: 8px 0;
}

.article-toc-title,
.article-cta-kicker {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.article-toc-list,
.article-cta-features {
  margin: 16px 0 0;
  padding: 0;
}

.article-toc-list {
  list-style: none;
}

.article-toc-section + .article-toc-section {
  margin-top: 8px;
}

.article-toc-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-link {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
  padding: 5px 0;
  color: var(--text-soft);
  font-size: 0.94rem;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
}

.article-toc-link:hover,
.article-toc-section-current .article-toc-link-section {
  color: var(--accent-strong);
}

.article-toc-link-active,
.article-toc-link[aria-current="true"] {
  color: var(--accent-strong);
}

.article-toc-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
}

.article-toc-chevron:hover {
  color: var(--accent-strong);
}

.article-toc-chevron span {
  display: block;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transform-origin: center;
  transition: transform 180ms ease;
}

.article-toc-section-active .article-toc-chevron span {
  transform: rotate(45deg);
}

.article-toc-sublist {
  display: none;
  list-style: none;
  margin: 6px 0 0;
  padding: 0 0 0 10px;
}

.article-toc-section-active > .article-toc-sublist {
  display: block;
}

.article-toc-sublist li + li {
  margin-top: 4px;
}

.article-toc-link-subsection {
  font-size: 0.88rem;
  color: var(--text-soft);
}

.article-cta {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.article-cta {
  padding: 24px;
}

.article-cta-title {
  margin: 14px 0 0;
  font-size: 1.55rem;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.article-cta-kicker,
.article-cta-title,
.article-cta-copy {
  color: var(--text);
}

.article-cta-kicker {
  color: var(--accent);
}

.article-cta-copy {
  margin: 14px 0 0;
  font-size: 1rem;
  line-height: 1.65;
}

.article-cta-features {
  padding-left: 1.2rem;
}

.article-cta-features li {
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.55;
}

.article-cta-features li + li {
  margin-top: 10px;
}

.article-cta-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: min(100%, 240px);
  margin: 18px auto 0;
  padding: 12px 20px;
  border-radius: 10px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 16px 32px rgba(66, 138, 255, 0.24);
}

.article-cta-button:hover {
  color: #ffffff;
  background: var(--accent-strong);
}

.article-body {
  grid-column: 2;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.article-body p,
.article-body li {
  font-size: 1.1rem;
  color: var(--text);
}

.article-body h2,
.article-body h3 {
  margin: 3rem 0 1rem;
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--text);
}

.article-body h2 {
  font-size: clamp(1.9rem, 3vw, 2.35rem);
}

.article-body h3 {
  font-size: clamp(1.4rem, 2vw, 1.7rem);
}

.article-body p {
  margin: 1.2rem 0;
}

.article-body ul {
  padding-left: 1.35rem;
}

.article-body blockquote {
  margin: 2.25rem 0;
  padding: 1.25rem 1.4rem;
  border-left: 6px solid var(--accent);
  background: var(--surface-muted);
  color: var(--text);
  font-size: 1.1rem;
}

.article-body blockquote > :first-child {
  margin-top: 0;
}

.article-body blockquote > :last-child {
  margin-bottom: 0;
}

.article-body figure {
  margin: 2.75rem 0;
}

.article-body figure img,
.article-body figure video {
  display: block;
  max-width: 100%;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.figure-caption {
  margin-top: 0.95rem;
  color: var(--text-soft);
  font-size: 0.94rem;
  line-height: 1.55;
}

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

.article-body em {
  color: var(--accent-strong);
}

@media (max-width: 1120px) {
  .article-shell {
    grid-template-columns: var(--body-column) var(--cta-column);
  }

  .article-header {
    grid-column: 1;
    width: 100%;
    max-width: 100%;
    justify-self: stretch;
  }

  .article-layout {
    grid-template-columns: var(--body-column) var(--cta-column);
  }

  .article-sidebar-left {
    display: none;
  }

  .article-body {
    grid-column: 1;
  }
}

@media (max-width: 720px) {
  .article-shell {
    grid-template-columns: 1fr;
    column-gap: 0;
    padding: 20px 14px 48px;
  }

  .article-header {
    grid-column: 1;
    width: 100%;
    justify-self: stretch;
    padding: 20px 16px;
    border-radius: 24px;
  }

  .article-title {
    font-size: clamp(2.1rem, 10vw, 3rem);
    line-height: 1.02;
  }

  .article-dek,
  .article-body p,
  .article-body li {
    font-size: 1rem;
  }

  .article-layout {
    grid-template-columns: 1fr;
    column-gap: 0;
    gap: 20px;
    margin-top: 28px;
  }

  .article-sidebar {
    position: static;
  }

  .article-sidebar-left {
    order: -1;
  }

  .article-body {
    grid-column: 1;
    padding: 0;
  }

  .article-toc {
    padding: 0;
  }

  .article-toc-link {
    padding: 5px 0;
  }

  .article-cta {
    border-radius: 20px;
    padding: 20px 18px;
  }

  .article-cta-title {
    font-size: 1.35rem;
  }
}