/* =========================================================================
   Sadebria Software — stylesheet
   ========================================================================= */

:root {
  /* Palette — amber on black */
  --color-bg: #0a0a0b;
  --color-surface: #121214;
  --color-surface-alt: #1a1a1d;
  --color-border: #2a2a30;
  --color-text: #f3e9b8;
  --color-text-muted: #a89e74;
  --color-accent: #f5c518;
  --color-accent-strong: #ffd84d;
  --color-accent-soft: #2a2108;
  --color-badge-bg: #2a2108;
  --color-badge-text: #ffd84d;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Scale */
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.35rem;
  --step-3: 1.7rem;
  --step-4: 2.2rem;
  --step-5: 2.9rem;

  /* Layout */
  --content-width: 1100px;
  --prose-width: 68ch;
  --radius: 12px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.3);

  /* Header height: padding (0.9rem * 2) + tallest child (desktop nav link ~45px) + border (1px) */
  --header-height: calc(1.8rem + 46px);
}

/* -------------------------------------------------------------------------
   Reset / base
   ------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}
.site-footer {
  flex-shrink: 0;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  text-underline-offset: 3px;
}
a:hover {
  color: var(--color-accent-strong);
  text-decoration: underline;
}
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

h1,
h2,
h3,
h4 {
  font-weight: 650;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 0 0 0.6em;
  color: var(--color-text);
}
h1 {
  font-size: var(--step-5);
  letter-spacing: -0.025em;
}
h2 {
  font-size: var(--step-4);
}
h3 {
  font-size: var(--step-3);
}
h4 {
  font-size: var(--step-2);
}

p {
  margin: 0 0 1em;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--color-surface-alt);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -10000px;
  top: 0;
  background: var(--color-accent);
  color: #0a0a0b;
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

/* -------------------------------------------------------------------------
   Layout container
   ------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

section {
  padding: 3.5rem 0;
}
@media (min-width: 720px) {
  section {
    padding: 5rem 0;
  }
}

/* -------------------------------------------------------------------------
   Header / nav
   ------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  max-width: var(--content-width);
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-text);
  font-weight: 650;
  letter-spacing: -0.01em;
  font-size: 1.05rem;
}
.brand:hover {
  color: var(--color-text);
  text-decoration: none;
}
.brand__mark {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
  flex: 0 0 auto;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle svg {
  width: 20px;
  height: 20px;
}
.nav-toggle__close {
  display: none;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__open {
  display: none;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__close {
  display: block;
}

.site-nav {
  display: none;
}
.site-nav[data-open="true"] {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.site-nav a {
  display: block;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: 500;
}
.site-nav a:hover {
  background: var(--color-surface-alt);
  text-decoration: none;
}
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

@media (min-width: 720px) {
  .nav-toggle {
    display: none;
  }
  .site-nav,
  .site-nav[data-open="true"] {
    display: block;
    position: static;
    background: transparent;
    border-bottom: 0;
    box-shadow: none;
  }
  .site-nav ul {
    flex-direction: row;
    padding: 0;
    gap: 0.25rem;
  }
}

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */

.hero {
  padding-top: 4.5rem;
  padding-bottom: 3.5rem;
  background:
    radial-gradient(60% 80% at 85% 0%, rgba(245, 197, 24, 0.08) 0%, transparent 60%),
    radial-gradient(50% 60% at 0% 10%, rgba(245, 197, 24, 0.05) 0%, transparent 70%);
  border-bottom: 1px solid var(--color-border);
}
@media (min-width: 720px) {
  .hero {
    padding-top: 7rem;
    padding-bottom: 5rem;
  }
}

.hero--compact {
  padding-top: 2.5rem;
  padding-bottom: 2rem;
}
@media (min-width: 720px) {
  .hero--compact {
    padding-top: 3.5rem;
    padding-bottom: 2.5rem;
  }
}

.section--tight {
  padding-top: 2rem;
  padding-bottom: 3rem;
}
@media (min-width: 720px) {
  .section--tight {
    padding-top: 2.5rem;
    padding-bottom: 4rem;
  }
}

.hero__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  background: var(--color-accent-soft);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  max-width: 18ch;
}

.hero__lede {
  font-size: var(--step-2);
  color: var(--color-text-muted);
  max-width: 56ch;
  margin-top: 1.25rem;
}

.hero__cta {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.15rem;
  font: inherit;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background-color 140ms ease,
    color 140ms ease,
    border-color 140ms ease,
    transform 140ms ease;
}
.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--color-accent);
  color: #0a0a0b;
}
.btn--primary:hover {
  background: var(--color-accent-strong);
  color: #0a0a0b;
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

/* -------------------------------------------------------------------------
   Section heading
   ------------------------------------------------------------------------- */

.section-heading {
  margin-bottom: 2.5rem;
  max-width: 52ch;
}
.section-heading__kicker {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  margin: 0 0 0.5rem;
}
.section-heading__lede {
  color: var(--color-text-muted);
  font-size: var(--step-1);
  margin-top: 0.25rem;
}

/* -------------------------------------------------------------------------
   Card grid
   ------------------------------------------------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 720px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .card-grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    border-color 140ms ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-border));
}

a.card,
.card--link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    border-color 140ms ease,
    background-color 120ms ease;
}
a.card:hover,
.card--link:hover {
  color: inherit;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
a.card:active,
.card--link:active {
  transform: translateY(1px) scale(0.99);
  box-shadow: var(--shadow-sm);
  border-color: color-mix(in srgb, var(--color-accent) 55%, var(--color-border));
  background-color: color-mix(in srgb, var(--color-accent-soft) 45%, var(--color-surface));
  transition-duration: 80ms;
}

/* Click ripple + sparkle burst (nodes injected by js/main.js) */
.card__ripple {
  position: absolute;
  pointer-events: none;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  background: radial-gradient(
    circle,
    rgba(255, 216, 77, 0.45) 0%,
    rgba(245, 197, 24, 0.25) 35%,
    rgba(245, 197, 24, 0) 70%
  );
  mix-blend-mode: screen;
  animation: card-ripple 900ms cubic-bezier(0.2, 0.6, 0.2, 1) forwards;
}
@keyframes card-ripple {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0.9;
  }
  60% {
    opacity: 0.7;
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0;
  }
}

.card__spark {
  position: absolute;
  pointer-events: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-strong);
  box-shadow:
    0 0 6px 1px rgba(255, 216, 77, 0.9),
    0 0 14px 3px rgba(245, 197, 24, 0.45);
  --dx: 0px;
  --dy: 0px;
  transform: translate(-50%, -50%);
  animation: card-spark 1000ms cubic-bezier(0.15, 0.7, 0.3, 1) forwards;
}
@keyframes card-spark {
  0% {
    transform: translate(-50%, -50%) scale(0.6);
    opacity: 1;
  }
  20% {
    transform: translate(calc(-50% + var(--dx) * 0.3), calc(-50% + var(--dy) * 0.3)) scale(1.2);
    opacity: 1;
  }
  100% {
    transform: translate(calc(-50% + var(--dx)), calc(-50% + var(--dy))) scale(0.2);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card__ripple,
  .card__spark {
    display: none;
  }
}

.card__icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  border-radius: 10px;
  margin-bottom: 1rem;
}
.card__icon svg {
  width: 22px;
  height: 22px;
}

.card h3 {
  font-size: var(--step-2);
  margin-bottom: 0.4rem;
}
.card p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* -------------------------------------------------------------------------
   Featured book (home page)
   ------------------------------------------------------------------------- */

.feature {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
  align-items: center;
}
@media (min-width: 720px) {
  .feature {
    padding: 2.75rem;
    grid-template-columns: minmax(0, 1fr) 260px;
  }
}
.feature__body h3 {
  font-size: var(--step-3);
  margin-top: 0.25rem;
}
.feature__body p {
  color: var(--color-text-muted);
}

.feature__cover {
  justify-self: center;
}

/* -------------------------------------------------------------------------
   Book cover (SVG-based)
   ------------------------------------------------------------------------- */

.book-cover {
  width: 220px;
  height: 300px;
  border-radius: 8px;
  background: linear-gradient(135deg, #050505 0%, #1a1408 55%, #3a2a08 100%);
  color: var(--color-accent-strong);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow:
    0 1px 0 rgba(255, 216, 77, 0.08) inset,
    -8px 0 14px rgba(0, 0, 0, 0.4),
    var(--shadow-md);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(245, 197, 24, 0.18);
}
.book-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 80% at 0% 0%, rgba(245, 197, 24, 0.18) 0%, transparent 60%);
  pointer-events: none;
}
.book-cover::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  background: linear-gradient(to bottom, rgba(245, 197, 24, 0.35), rgba(245, 197, 24, 0));
  pointer-events: none;
}
.book-cover__kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.85;
}
.book-cover__title {
  font-size: 1.6rem;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 0.75rem;
}
.book-cover__lambda {
  font-family: var(--font-mono);
  font-size: 4rem;
  line-height: 1;
  opacity: 0.85;
  align-self: flex-end;
}
.book-cover__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}

.book-cover--lg {
  width: 260px;
  height: 360px;
}
.book-cover--lg .book-cover__title {
  font-size: 1.9rem;
}
.book-cover--lg .book-cover__lambda {
  font-size: 5rem;
}

/* -------------------------------------------------------------------------
   Badges
   ------------------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
}

/* -------------------------------------------------------------------------
   Breadcrumb
   ------------------------------------------------------------------------- */

.breadcrumb {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  position: sticky;
  top: var(--header-height);
  z-index: 15;
  padding: 0.5rem 0.75rem;
  margin: 0 -0.75rem 1.5rem;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb a {
  color: var(--color-text-muted);
}
.breadcrumb a:hover {
  color: var(--color-accent);
}
.breadcrumb__sep {
  margin: 0 0.5rem;
  opacity: 0.5;
}

/* -------------------------------------------------------------------------
   Book page layout
   ------------------------------------------------------------------------- */

.book {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-top: 1rem;
}
@media (min-width: 720px) {
  .book {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }
}
.book__cover-col {
  justify-self: center;
}
.book__header h1 {
  font-size: var(--step-4);
  margin-top: 0.5rem;
}
.book__lede {
  font-size: var(--step-2);
  color: var(--color-text-muted);
  margin: 0.5rem 0 1.5rem;
}

.topic-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}
@media (min-width: 560px) {
  .topic-list {
    grid-template-columns: 1fr 1fr;
  }
}

.topic-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  line-height: 1.4;
}
.topic-list .topic-list__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-strong);
  padding-top: 0.1rem;
  min-width: 2ch;
}

.callout {
  background: var(--color-accent-soft);
  border: 1px solid color-mix(in srgb, var(--color-accent) 30%, var(--color-border));
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 2rem;
}
.callout h3 {
  margin-top: 0;
}
.callout p {
  margin-bottom: 0.5rem;
}
.callout p:last-child {
  margin-bottom: 0;
}

/* -------------------------------------------------------------------------
   Tables
   ------------------------------------------------------------------------- */

.table-wrapper {
  overflow-x: auto;
  margin: 1.25rem 0 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}
.table-wrapper table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.table-wrapper th,
.table-wrapper td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.table-wrapper th {
  background: var(--color-surface-alt);
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.table-wrapper tbody tr:last-child td {
  border-bottom: 0;
}

/* -------------------------------------------------------------------------
   Prose / doc pages
   ------------------------------------------------------------------------- */

.doc-content {
  max-width: 72ch;
}
.doc-content h1 {
  font-size: var(--step-4);
  margin-top: 0;
}
.doc-content h1:not(:first-child) {
  margin-top: 2.5rem;
}
.doc-content h2 {
  font-size: var(--step-3);
  margin-top: 2.25rem;
}
.doc-content h3 {
  font-size: var(--step-2);
  margin-top: 1.75rem;
}
.doc-content p {
  color: var(--color-text);
}
.doc-content p + ul,
.doc-content p + ol {
  margin-top: -0.25rem;
}
.doc-content ul,
.doc-content ol {
  padding-left: 1.25rem;
}
.doc-content li {
  margin-bottom: 0.35rem;
}
.doc-content li > p {
  margin-bottom: 0.35rem;
}
.doc-content code {
  color: var(--color-accent-strong);
}
.doc-content pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
}
.doc-content pre code {
  background: none;
  padding: 0;
  color: var(--color-text);
}
.doc-content hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}
.doc-content ol#markdown-toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem 1rem 2.25rem;
  margin: 0 0 2rem;
}
.doc-content ol#markdown-toc li {
  margin-bottom: 0.25rem;
}
.doc-content .text-delta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  margin: 0 0 0.5rem;
}

/* -------------------------------------------------------------------------
   Primary CTA banner
   ------------------------------------------------------------------------- */

.cta-banner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 2rem;
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(245, 197, 24, 0.18) 0%, transparent 65%),
    radial-gradient(70% 100% at 0% 100%, rgba(245, 197, 24, 0.08) 0%, transparent 75%), var(--color-surface);
  border: 1px solid color-mix(in srgb, var(--color-accent) 35%, var(--color-border));
  border-radius: var(--radius);
  color: var(--color-text);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease;
  position: relative;
  overflow: hidden;
}
@media (min-width: 720px) {
  .cta-banner {
    padding: 2.5rem 2.75rem;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2.5rem;
  }
}
.cta-banner:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--color-accent) 60%, var(--color-border));
  box-shadow: var(--shadow-md);
  color: var(--color-text);
  text-decoration: none;
}
.cta-banner__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  margin-bottom: 0.6rem;
}
.cta-banner h2 {
  font-size: var(--step-3);
  margin: 0;
  color: var(--color-text);
}
.cta-banner p {
  color: var(--color-text-muted);
  margin: 0.5rem 0 0;
  max-width: 52ch;
}
.cta-banner__action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.4rem;
  background: var(--color-accent);
  color: #0a0a0b;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: background-color 140ms ease;
}
.cta-banner__action svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.cta-banner:hover .cta-banner__action {
  background: var(--color-accent-strong);
}

/* -------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  margin-top: 3rem;
  background: var(--color-surface);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
@media (min-width: 720px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}
.site-footer a {
  color: var(--color-text-muted);
}
.site-footer a:hover {
  color: var(--color-accent);
}