:root {
  --buin-primary: #6eb5ed;
  --buin-primary-dark: #2b82c4;
  --buin-ink: #272b30;
  --buin-muted: #667085;
  --buin-bg: #f5f8fb;
  --buin-card: #ffffff;
  --buin-border: #dce7f1;
  --buin-soft: #eaf5fd;
  --buin-green: #0f766e;
  --buin-shadow: 0 18px 44px rgba(39, 43, 48, .08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--buin-ink);
  background: var(--buin-bg);
  line-height: 1.62;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid var(--buin-border);
  backdrop-filter: blur(12px);
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: inline-flex;
  align-items: center;
}

.logo img {
  height: 38px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 15px;
  font-weight: 700;
  color: #3f4751;
}

.nav-links a:hover {
  color: var(--buin-primary-dark);
}

.nav-cta,
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 800;
  line-height: 1;
}

.nav-cta,
.btn-primary {
  color: #1f2933;
  background: var(--buin-primary);
}

.nav-cta {
  padding: 12px 18px;
}

.btn-primary,
.btn-secondary {
  min-height: 48px;
  padding: 14px 20px;
}

.btn-secondary {
  color: var(--buin-ink);
  background: #fff;
  border: 1px solid var(--buin-border);
}

.hero {
  padding: 72px 0 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr);
  gap: 34px;
  align-items: end;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--buin-primary-dark);
  background: var(--buin-soft);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--buin-ink);
  line-height: 1.12;
}

h1 {
  max-width: 820px;
  font-size: clamp(38px, 6vw, 70px);
  letter-spacing: -.03em;
}

.hero p {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--buin-muted);
  font-size: 20px;
}

.hero-panel,
.card,
.article-card,
.toc,
.article-body,
.note-box {
  background: var(--buin-card);
  border: 1px solid var(--buin-border);
  box-shadow: var(--buin-shadow);
}

.hero-panel {
  border-radius: 24px;
  padding: 24px;
}

.hero-panel strong {
  display: block;
  margin-bottom: 10px;
  font-size: 16px;
}

.hero-panel ul,
.article-body ul,
.article-body ol {
  margin: 0;
  padding-left: 22px;
}

.hero-panel li,
.article-body li {
  margin: 8px 0;
}

.section {
  padding: 42px 0;
}

.section-alt {
  background: #fff;
}

.section-title {
  max-width: 760px;
  margin-bottom: 24px;
}

.section-title-row {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.section-title-row > div {
  max-width: 760px;
}

.section-title h2 {
  font-size: clamp(28px, 4vw, 44px);
}

.section-title p {
  margin: 12px 0 0;
  color: var(--buin-muted);
  font-size: 18px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.article-card {
  min-height: 100%;
  border-radius: 22px;
  padding: 24px;
  transition: transform .15s ease, box-shadow .15s ease;
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 54px rgba(39, 43, 48, .12);
}

.news-card {
  border-left: 5px solid var(--buin-green);
}

.article-card .meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--buin-muted);
  font-size: 13px;
  font-weight: 700;
}

.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 5px 10px;
  color: var(--buin-primary-dark);
  background: var(--buin-soft);
}

.article-card h2,
.article-card h3 {
  font-size: 24px;
}

.article-card p {
  margin: 12px 0 0;
  color: var(--buin-muted);
}

.read-more {
  display: inline-flex;
  margin-top: 18px;
  color: var(--buin-primary-dark);
  font-weight: 800;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

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

.card h3 {
  font-size: 18px;
}

.card p {
  margin: 8px 0 0;
  color: var(--buin-muted);
}

.cta-band {
  margin: 42px 0 0;
  padding: 34px;
  border-radius: 26px;
  color: #fff;
  background: linear-gradient(135deg, #272b30, #1f2933);
}

.cta-band h2,
.cta-band p {
  color: #fff;
}

.cta-band p {
  max-width: 720px;
  opacity: .78;
}

.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 28px;
  align-items: start;
}

.article-body {
  border-radius: 26px;
  padding: clamp(24px, 5vw, 54px);
}

.article-body h2 {
  margin-top: 38px;
  font-size: 30px;
}

.article-body h3 {
  margin-top: 26px;
  font-size: 22px;
}

.article-body p {
  margin: 16px 0 0;
}

.article-body a {
  color: var(--buin-primary-dark);
  font-weight: 800;
}

.lead {
  color: #3f4751;
  font-size: 21px;
}

.toc {
  position: sticky;
  top: 96px;
  border-radius: 18px;
  padding: 18px;
}

.toc strong {
  display: block;
  margin-bottom: 10px;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--buin-muted);
  font-size: 14px;
  font-weight: 700;
}

.toc a:hover {
  color: var(--buin-primary-dark);
}

.note-box {
  margin: 24px 0;
  padding: 20px;
  border-radius: 18px;
  background: #f7fbff;
}

.note-box strong {
  color: var(--buin-green);
}

.article-footer {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--buin-border);
}

.site-footer {
  margin-top: 56px;
  padding: 34px 0;
  border-top: 1px solid var(--buin-border);
  color: var(--buin-muted);
  background: #fff;
  font-size: 14px;
}

.site-footer .footer-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.site-footer a {
  color: var(--buin-primary-dark);
  font-weight: 800;
}

@media (max-width: 880px) {
  .hero-grid,
  .article-layout,
  .article-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .section-title-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .toc {
    position: static;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    width: 100%;
    flex-wrap: wrap;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .hero {
    padding-top: 44px;
  }

  .cta-actions,
  .btn-primary,
  .btn-secondary,
  .nav-cta {
    width: 100%;
  }
}