:root {
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --color-bg: #e9f0f7;
  --color-surface: #ffffff;
  --color-ink: #0c1a2e;
  --color-muted: #4a6278;
  --color-line: #c2d3e4;
  --color-accent: #c9920e;
  --color-accent-hover: #a87608;
  --color-accent-soft: #fef6e4;
  --color-glow: #0d9488;
  --color-grid: rgba(26, 31, 46, 0.035);
  --pattern-grid:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  --pattern-grid-size: 20px 20px;
  --shadow-sm: 0 1px 2px rgba(26, 31, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 31, 46, 0.08);
  --radius: 6px;
  --max-width: 1120px;
  --gutter: clamp(1rem, 2.5vw, 1.5rem);
  --prose-max: 56.25rem;
  --section-y: 3.5rem;
  --color-bg-muted: #eef4fb;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-bg);
}

.page-shell {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

main {
  padding-bottom: 4.5rem;
}

@media (min-width: 768px) {
  main {
    padding-bottom: 0;
  }
}

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

a:not(.btn):not(.brand) {
  color: var(--color-glow);
}

.footer-responsible-copy a {
  color: var(--color-accent);
}

a:hover {
  text-decoration-thickness: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--color-ink);
  color: #fff;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(233, 240, 247, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.65rem var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--color-ink);
  text-transform: uppercase;
}

.brand-logo {
  border-radius: 8px;
  border: 1px solid var(--color-line);
  object-fit: cover;
}

.brand span {
  color: var(--color-glow);
}

.header-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--color-ink);
  border-radius: 3px;
}

.nav-toggle {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.primary-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.primary-nav.is-open {
  display: flex;
}

@media (min-width: 768px) {
  .primary-nav {
    display: flex;
    flex-direction: row;
    width: auto;
    margin-left: auto;
    gap: 1rem;
  }
}

.primary-nav a {
  text-decoration: none;
  color: var(--color-muted);
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.primary-nav a.is-active,
.primary-nav a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.header-cta {
  width: 100%;
}

@media (min-width: 768px) {
  .header-cta {
    width: auto;
    margin-left: 0.5rem;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn--primary {
  background: linear-gradient(180deg, #dbad1a 0%, var(--color-accent) 100%);
  color: #fff;
  border-color: var(--color-accent-hover);
  text-shadow: 0 1px 0 rgba(12, 26, 46, 0.25);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.js-affiliate-pending {
  cursor: not-allowed;
  opacity: 0.88;
}

.btn--ghost,
.btn--secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}

.btn--secondary:hover {
  border-color: var(--color-glow);
  color: var(--color-ink);
}

.btn--sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.72rem;
}

.hero {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
  padding: 1.75rem 0 2.25rem;
}

.hero--mechanics {
  background: linear-gradient(135deg, #f8fbfd 0%, var(--color-surface) 48%, #eef6f4 100%);
}

.hero__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  gap: 1.75rem 2rem;
  align-items: center;
}

@media (min-width: 960px) {
  .hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 46%);
  }
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin: 0 0 0.5rem;
}

.hero__content h1 {
  font-size: clamp(1.55rem, 4vw, 2.15rem);
  line-height: 1.2;
  font-weight: 600;
  margin: 0 0 1.125rem;
  max-width: 22ch;
}

.hero__lead {
  margin: 0 0 1.125rem;
  max-width: 42rem;
  color: var(--color-muted);
}

.hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}

.hero__chips li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.35rem 0.6rem;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 3px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.hero__media {
  margin: 0;
  line-height: 0;
}

.hero__media picture {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-md);
  background: #0a1f24;
}

.hero__media img {
  width: 100%;
  height: auto;
  display: block;
}

.affiliate-note {
  font-size: 0.85rem;
  color: var(--color-muted);
  padding: 0.65rem 0.85rem;
  background: var(--color-accent-soft);
  border-left: 3px solid var(--color-accent);
  margin: 0 0 1rem;
  max-width: var(--prose-max);
}

.section {
  padding: var(--section-y) 0;
  background: var(--color-surface);
}

.section--tint {
  background: var(--color-bg-muted);
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section__kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-glow);
  margin: 0 0 0.5rem;
}

.section h2 {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 0 0 1.25rem;
}

.section h3 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.5rem;
}

.prose {
  max-width: var(--prose-max);
}

.prose p {
  margin: 0 0 1.125rem;
  color: var(--color-muted);
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: var(--color-ink);
}

.diagram-panel {
  margin-top: 2rem;
  padding: 1.25rem 1.35rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.diagram-panel .prose {
  max-width: var(--prose-max);
}

.diagram-panel__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin: 0 0 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.mode-compare {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

@media (min-width: 720px) {
  .mode-compare {
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
  }
}

.mode-card {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.35rem;
  min-height: 100%;
  background-color: var(--color-surface);
  border: 2px solid var(--color-line);
  border-radius: var(--radius);
}

.mode-card--base {
  border-color: #5b7c9a;
  background-image: var(--pattern-grid);
  background-size: var(--pattern-grid-size);
}

.mode-card--free {
  border-color: var(--color-accent);
  background-color: var(--color-accent-soft);
  background-image: none;
}

.mode-card__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin: 0 0 0.55rem;
  min-height: 1.1rem;
}

.mode-card__rule {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  line-height: 1.35;
  min-height: 2.75rem;
}

.mode-card__rule em {
  font-style: normal;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.mode-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.mode-compare__vs {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted);
  padding: 0 0.25rem;
}

.flow-list {
  margin: 2rem 0 0;
  max-width: var(--prose-max);
}
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.flow-list li {
  counter-increment: flow;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px dashed var(--color-line);
}

.flow-list li::before {
  content: counter(flow, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
}

.flow-list p {
  margin: 0;
  color: var(--color-muted);
}

.ref-note {
  max-width: var(--prose-max);
  margin: 0 0 1.75rem;
  padding: 1rem 1.15rem;
  font-size: 0.92rem;
  color: var(--color-muted);
  background: var(--color-bg-muted);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.ref-note p {
  margin: 0;
}

.ref-note strong {
  color: var(--color-ink);
}

.data-grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin-top: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.data-grid th,
.data-grid td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.data-grid th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: #f8f9fb;
  width: 30%;
}

.data-grid td {
  color: var(--color-muted);
}

.prose--after-table {
  margin-top: 1.125rem;
}

.data-grid tr:last-child th,
.data-grid tr:last-child td {
  border-bottom: none;
}

#faq.section {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.faq-block {
  margin-top: 0.25rem;
}

.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.faq-q {
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.9rem 1rem;
  min-height: 3.25rem;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.faq-q::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-accent);
}

.faq-q[aria-expanded="true"]::after {
  content: "−";
}

.faq-a {
  padding: 0 1rem 0.85rem;
  color: var(--color-muted);
  font-size: 0.98rem;
}

.page-editorial-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  margin: 1.25rem 0 0;
  max-width: var(--prose-max);
}

.site-footer {
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
  padding: 2.25rem var(--gutter) 2rem;
  margin-top: 0;
}

.footer-minimal {
  max-width: var(--max-width);
  margin-inline: auto;
  text-align: left;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-muted);
}

.footer-top-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
  margin-bottom: 1.125rem;
}

.footer-age {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.72rem;
  line-height: 1;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--color-ink);
  border-radius: 3px;
  color: var(--color-ink);
}

.footer-inline-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.35rem 0.45rem;
  margin: 0;
}

.footer-inline-nav a {
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
}

.footer-inline-nav a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.footer-responsible-copy {
  margin: 0 0 0.75rem;
  max-width: var(--prose-max);
  color: var(--color-ink);
  font-size: 0.875rem;
}

.footer-responsible-copy a {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: none;
}

.footer-responsible-copy a:hover {
  text-decoration: underline;
}

.footer-meta-copy {
  margin: 0 0 1.125rem;
  max-width: var(--prose-max);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.01em;
}

.sticky-cta {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 40;
  padding: 0.65rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  color: #fff;
  background: var(--color-ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.sticky-cta:hover {
  background: #0d111a;
  color: #fff;
}

@media (min-width: 768px) {
  .sticky-cta {
    display: none;
  }
}