:root {
  color-scheme: light;
  --ink: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --surface: #f8fafc;
  --surface-soft: #f1f5f9;
  --white: #ffffff;
  --primary: #d00000;
  --primary-dark: #a50000;
  --radius: 1.6rem;
  --shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.09);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--surface);
  line-height: 1.55;
}

a {
  color: inherit;
}

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

::selection {
  background: rgba(208, 0, 0, 0.18);
}

.container {
  width: min(1400px, 100% - 2rem);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(226, 232, 240, 0.85);
  backdrop-filter: blur(8px);
  background: rgba(248, 250, 252, 0.95);
}

.site-nav {
  display: grid;
  gap: 0.75rem;
  padding: 1rem 0;
}

.brand {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.menu-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.92rem;
  color: #334155;
}

.menu-links a {
  text-decoration: none;
}

.menu-links a:hover {
  color: var(--ink);
}

.section,
.hero {
  padding: 2.8rem 0;
  border-bottom: 1px solid var(--border);
}

.section-white {
  background: var(--white);
}

.hero {
  min-height: 86vh;
}

.hero-content {
  max-width: 58rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--primary);
}

.eyebrow-muted {
  color: #64748b;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

h1 {
  margin-top: 1rem;
  font-size: clamp(2rem, 5vw, 4rem);
}

h2 {
  margin-top: 0.85rem;
  font-size: clamp(1.6rem, 3.6vw, 2.8rem);
}

h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
}

p {
  color: var(--muted);
}

.lead {
  margin-top: 1rem;
  max-width: 70ch;
  font-size: 1rem;
}

.button-row {
  margin-top: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0.72rem 1.25rem;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  transition: all 0.2s ease;
  cursor: pointer;
}

.button-primary {
  background: var(--primary);
  color: white;
}

.button-primary:hover {
  background: var(--primary-dark);
}

.button-secondary {
  border-color: #cbd5e1;
  background: var(--white);
  color: #334155;
}

.button-secondary:hover {
  border-color: #94a3b8;
  color: #0f172a;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.full-width {
  width: 100%;
}

.split-grid {
  display: grid;
  gap: 2rem;
}

.stack-grid {
  display: grid;
  gap: 0.75rem;
}

.series-tile {
  display: block;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--white);
  border-radius: 1.4rem;
  padding: 1rem;
}

.series-tile:hover {
  border-color: #cbd5e1;
}

.series-tile-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.series-tile-head span {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.62rem;
  border-radius: 999px;
  border: 1px solid #cbd5e1;
  background: var(--surface-soft);
  color: #b91c1c;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.trust-block {
  margin-top: 1.5rem;
}

.trust-block p {
  margin: 0.68rem 0 0;
}

.section-head {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 1.35rem;
}

.section-head p {
  margin: 0;
  font-size: 0.9rem;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.insight-card {
  border: 1px solid var(--border);
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.insight-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #64748b;
}

.series-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid #cbd5e1;
  background: var(--surface-soft);
  padding: 0.2rem 0.6rem;
  color: #475569;
  font-size: 0.66rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  font-weight: 600;
}

.insight-card h3 {
  margin-top: 0.8rem;
  font-size: clamp(1.2rem, 3vw, 1.65rem);
}

.insight-card p {
  margin-top: 0.7rem;
  font-size: 0.93rem;
}

.insight-so-what {
  border-left: 2px solid var(--primary);
  padding-left: 0.68rem;
  color: #334155;
}

.text-link {
  display: inline-flex;
  margin-top: 0.9rem;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.text-link:hover {
  color: var(--primary-dark);
}

.step-grid {
  margin-top: 1rem;
  display: grid;
  gap: 0.85rem;
}

.step-card {
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  background: var(--white);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.step-label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
}

.step-card h3 {
  margin-top: 0.35rem;
}

.step-card p {
  margin-top: 0.4rem;
  font-size: 0.9rem;
}

.cta-box {
  border: 1px solid var(--border);
  border-radius: 2rem;
  background: var(--surface);
  padding: 1.6rem;
  box-shadow: var(--shadow);
}

.series-index-grid,
.two-col-cards {
  margin-top: 1.3rem;
  display: grid;
  gap: 0.85rem;
}

.series-index-card {
  display: block;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  background: var(--white);
  padding: 1rem;
}

.series-index-card:hover {
  border-color: #cbd5e1;
}

.series-index-card h2 {
  margin-top: 0;
  font-size: 1.35rem;
}

.detail-grid {
  display: grid;
  gap: 1.2rem;
}

.so-what-box {
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  background: var(--white);
  padding: 1rem;
}

.source-citation {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 1.4rem;
  padding: 1rem;
  align-self: start;
}

.source-citation h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #334155;
}

.source-citation ul {
  margin: 0.7rem 0 0;
  padding-left: 1rem;
  color: #475569;
  display: grid;
  gap: 0.3rem;
  font-size: 0.92rem;
}

.source-citation a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.insight-content {
  margin-top: 1.2rem;
}

.insight-content h2,
.cpi-insight-content h2 {
  margin: 1.3rem 0 0.55rem;
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 700;
}

.insight-content h3 {
  margin: 1rem 0 0.45rem;
  font-size: clamp(1.05rem, 2.2vw, 1.4rem);
}

.insight-content p,
.cpi-insight-content p {
  margin: 0.6rem 0;
}

.insight-content ul,
.insight-content ol {
  margin: 0.5rem 0 0.95rem;
  padding-left: 1.25rem;
  color: #334155;
}

.insight-content li {
  margin-bottom: 0.45rem;
}

.insight-content blockquote {
  margin: 0.8rem 0;
  padding: 0.65rem 0.9rem;
  border-left: 3px solid var(--primary);
  background: #fff;
  color: #334155;
}

.form-grid {
  display: grid;
  gap: 1.2rem;
}

.form-card {
  border: 1px solid var(--border);
  border-radius: 1.8rem;
  background: var(--white);
  padding: 1.05rem;
  box-shadow: var(--shadow);
}

.form-card label {
  display: block;
  margin-top: 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #1e293b;
}

.form-card input {
  width: 100%;
  margin-top: 0.35rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.9rem;
  padding: 0.72rem 0.82rem;
  font-size: 0.92rem;
}

.form-card input:focus {
  border-color: var(--primary);
  outline: none;
}

.form-note {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  color: #64748b;
}

.form-note.warning {
  border: 1px solid #fecaca;
  border-radius: 0.9rem;
  background: #fef2f2;
  padding: 0.7rem;
  color: #7f1d1d;
}

.form-note code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid #fecaca;
  border-radius: 0.4rem;
  padding: 0.1rem 0.3rem;
}

.bullet-list {
  margin: 1rem 0 0;
  padding-left: 1rem;
  color: #334155;
  display: grid;
  gap: 0.45rem;
}

.info-card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 1.4rem;
  padding: 1rem;
}

.info-card h2 {
  font-size: 1.35rem;
  margin-top: 0;
}

.info-card p {
  margin-top: 0.6rem;
  font-size: 0.93rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.82);
}

.footer-grid {
  display: grid;
  gap: 0.8rem;
  padding: 1.7rem 0;
  font-size: 0.9rem;
  color: #475569;
}

.footer-logo {
  width: fit-content;
}

.footer-logo img {
  width: auto;
  height: 2.5rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

@media (min-width: 768px) {
  .container {
    width: min(1400px, 100% - 4rem);
  }

  .site-nav {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 1rem;
  }

  .section,
  .hero {
    padding: 4rem 0;
  }

  .split-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .section-head {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .step-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 1.5rem;
  }

  .series-index-grid,
  .two-col-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 1.6rem;
  }

  .detail-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 1.5rem;
    align-items: start;
  }

  .form-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 1.7rem;
  }

  .footer-grid {
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1rem;
  }

  .footer-links {
    justify-content: flex-end;
  }
}