/* ============================================================
   CJC-1295 Compound — Paper Ink Aesthetic
   Cool-white leaf (#FAFBFC) + iron-gall ink-blue spot (#1E3A5F)
   ============================================================ */

/* ---- Custom Properties ---- */
:root {
  --primary:      #1E3A5F;
  --primary-50:   #EAEEF4;
  --primary-900:  #10233C;
  --secondary:    #5B6B7E;
  --accent:       #9A2D2D;
  --neutral-50:   #FAFBFC;
  --neutral-200:  #E2E6EB;
  --neutral-500:  #6B7480;
  --neutral-900:  #15181D;
  --bg:           #FAFBFC;
  --surface:      #FFFFFF;
  --text:         #15181D;
  --text-muted:   #5B6B7E;
  --success:      #1F6B43;
  --warning:      #8A5A12;
  --danger:       #9A2D2D;
  --max-width:    70rem;
  --measure:      38rem;
  --px:           clamp(1rem, 3vw, 2.25rem);
  --font-heading: 'Cormorant Garamond', 'Cormorant', Garamond, Georgia, 'Times New Roman', serif;
  --font-body:    'Source Serif 4', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --radius:       2px;
  --transition:   300ms ease;
}

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-feature-settings: 'onum' 1, 'liga' 1, 'kern' 1;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus {
  color: var(--primary-900);
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: none;
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.12;
  color: var(--text);
}

h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.6rem);
  font-weight: 600;
  letter-spacing: -0.005em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
}

h3 {
  font-size: 1.4rem;
  font-weight: 500;
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
}

p {
  max-width: var(--measure);
}

p + p {
  margin-top: 1.1em;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

small {
  font-size: 0.875rem;
}

code,
.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--neutral-50);
  border: 1px solid var(--neutral-200);
  padding: 0.1em 0.35em;
  border-radius: var(--radius);
}

/* ---- Eyebrow / Label ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neutral-500);
  display: block;
  margin-bottom: 0.75rem;
}

.hero-band .eyebrow {
  color: rgba(202, 213, 225, 0.85);
}

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--px);
}

/* ---- Ornamented Rule ---- */
.rule-ornament {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-block: 2rem;
}

.rule-ornament::before,
.rule-ornament::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--primary);
  opacity: 0.35;
}

.rule-ornament-diamond {
  width: 0.45rem;
  height: 0.45rem;
  background: var(--primary);
  transform: rotate(45deg);
  opacity: 0.6;
  flex-shrink: 0;
}

/* Double rule */
.double-rule {
  border: none;
  border-top: 2px solid var(--primary);
  box-shadow: 0 2px 0 0 var(--primary);
  padding-top: 3px;
  opacity: 0.25;
  margin-block: 1.5rem;
}

/* ---- Site Header / Masthead ---- */
.site-header {
  background: var(--surface);
  border-bottom: 2px solid var(--primary);
  box-shadow: 0 1px 0 var(--primary);
  padding-block: 0.9rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-brand:hover {
  color: var(--primary-900);
}

/* ---- Primary Nav ---- */
.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem 0.25rem;
  align-items: center;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.site-nav a:hover,
.site-nav a:focus,
.site-nav a[aria-current="page"] {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: var(--primary);
  text-underline-offset: 0.25em;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 26px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ---- Hero Band (index) ---- */
.hero-band {
  background: var(--primary-900);
  color: var(--neutral-50);
  padding-block: 4rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero-band::after {
  content: '';
  display: block;
  height: 3px;
  background: var(--neutral-50);
  box-shadow: 0 2px 0 var(--neutral-50);
  opacity: 0.4;
}

.hero-band .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.hero-content {
  max-width: 42ch;
}

.hero-band h1 {
  color: var(--neutral-50);
  margin-bottom: 1rem;
}

.hero-lede {
  font-style: italic;
  font-size: 1.125rem;
  color: #C8D2DE;
  max-width: 60ch;
  line-height: 1.55;
  margin-bottom: 1.75rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---- Plate Figure (hero image) ---- */
.plate-figure {
  margin: 0;
}

.plate-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(200, 210, 222, 0.7);
  margin-top: 0.5rem;
}

.hero-plate-img {
  border: 1px solid rgba(200, 210, 222, 0.25);
  border-radius: var(--radius);
  width: 100%;
  max-width: 520px;
}

/* Interior page hero */
.page-hero {
  padding-block: 3rem 2rem;
  border-bottom: 1px solid var(--neutral-200);
  margin-bottom: 3rem;
}

.page-hero h1 {
  max-width: 26ch;
  margin-bottom: 0.75rem;
}

.page-hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 55ch;
}

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--neutral-50);
  border-color: var(--primary);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--primary-900);
  border-color: var(--primary-900);
  color: var(--neutral-50);
}

/* On dark hero band: paper-white fill */
.hero-band .btn-primary {
  background: var(--neutral-50);
  color: var(--primary);
  border-color: var(--neutral-50);
}

.hero-band .btn-primary:hover {
  background: #dde4ed;
  color: var(--primary-900);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background: var(--primary-50);
}

/* Ghost outline on dark */
.hero-band .btn-secondary {
  color: var(--neutral-50);
  border-color: rgba(250, 251, 252, 0.6);
}

.hero-band .btn-secondary:hover {
  background: rgba(250, 251, 252, 0.1);
  border-color: var(--neutral-50);
}

/* ---- Main Content ---- */
main {
  flex: 1;
  padding-block: 2rem 4rem;
}

.content-body {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--px);
}

/* Reading measure for prose */
.prose p,
.prose li,
.prose blockquote {
  max-width: var(--measure);
}

.prose h2 {
  margin-top: 2.5rem;
  margin-bottom: 0.9rem;
}

.prose h3 {
  margin-top: 2rem;
  margin-bottom: 0.65rem;
  color: var(--primary);
}

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.5rem;
  max-width: var(--measure);
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.4em;
}

/* ---- Drop Cap ---- */
.drop-cap::first-letter {
  font-family: var(--font-heading);
  font-size: 4.5em;
  font-weight: 700;
  color: var(--primary);
  float: left;
  line-height: 0.78;
  margin-right: 0.08em;
  margin-top: 0.07em;
  padding-bottom: 0.05em;
}

/* ---- Pull Quote ---- */
.pull-quote {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--primary);
  max-width: 32ch;
  border-top: 1px solid var(--primary);
  border-bottom: 1px solid var(--primary);
  padding-block: 1rem;
  margin-block: 2.5rem;
  position: relative;
}

/* ---- Callout ---- */
.callout {
  border-left: 3px solid var(--primary);
  padding: 1rem 1.25rem;
  margin-block: 1.75rem;
  background: var(--primary-50);
  border-radius: 0 var(--radius) var(--radius) 0;
  max-width: var(--measure);
}

.callout-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  display: block;
  margin-bottom: 0.5rem;
}

/* Regulatory callout */
.callout-regulatory {
  border-left-color: var(--accent);
  background: #fdf0f0;
}

.callout-regulatory .callout-label {
  color: var(--accent);
}

/* ---- Cards ---- */
.card {
  border: 1px solid var(--neutral-200);
  border-top: 2px solid var(--primary);
  border-radius: var(--radius);
  padding: 1.6rem;
  background: var(--surface);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.75rem;
}

/* ---- Plate Figures (content) ---- */
.content-plate {
  margin-block: 2.5rem;
  display: inline-block;
  max-width: 52rem;
}

.content-plate img {
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius);
  width: 100%;
}

.content-plate figcaption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* ---- Comparison Table ---- */
.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin-block: 1.75rem;
  max-width: 52rem;
}

.ledger-table caption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: left;
  padding-bottom: 0.5rem;
}

.ledger-table th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary);
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--primary);
  white-space: nowrap;
}

.ledger-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--neutral-200);
  vertical-align: top;
}

.ledger-table tbody tr:nth-child(even) {
  background: var(--neutral-50);
}

/* ---- Citation Superscripts ---- */
sup a {
  font-family: var(--font-mono);
  font-size: 0.65em;
  color: var(--primary);
  text-decoration: none;
  padding: 0 0.1em;
  font-weight: 600;
  transition: color var(--transition);
}

sup a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* ---- FAQ Accordion ---- */
.faq-list {
  margin-top: 1.5rem;
  max-width: var(--measure);
}

.faq-item {
  border-bottom: 1px solid var(--neutral-200);
}

.faq-question {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  padding: 1rem 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  width: 100%;
  text-align: left;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--primary);
  flex-shrink: 0;
  transition: transform var(--transition);
  line-height: 1;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding-bottom: 1rem;
  padding-right: 2rem;
}

.faq-answer p {
  color: var(--text);
  font-size: 1rem;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ---- References List ---- */
.references-list {
  list-style: decimal;
  padding-left: 1.75rem;
  max-width: 52rem;
  margin-top: 1.5rem;
}

.references-list li {
  margin-bottom: 1.1rem;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text);
}

.references-list li a {
  word-break: break-all;
}

/* ---- Contact Form ---- */
.contact-form {
  max-width: 32rem;
  margin-top: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  transition: border-color var(--transition);
}

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

.form-group textarea {
  min-height: 7rem;
  resize: vertical;
}

/* ---- Site Footer ---- */
.site-footer {
  background: var(--primary-900);
  color: rgba(202, 213, 225, 0.85);
  padding-block: 3rem 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-col-heading {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neutral-50);
  margin-bottom: 0.9rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-col a {
  font-size: 0.9rem;
  color: rgba(202, 213, 225, 0.75);
  text-decoration: none;
  transition: color var(--transition);
  line-height: 1.4;
}

.footer-col a:hover {
  color: var(--neutral-50);
}

.footer-bottom {
  border-top: 1px solid rgba(202, 213, 225, 0.2);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-disclaimer {
  font-style: italic;
  font-size: 0.9rem;
  color: rgba(202, 213, 225, 0.7);
  max-width: 52ch;
  line-height: 1.5;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: rgba(202, 213, 225, 0.5);
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding-block: 0.75rem;
  border-bottom: 1px solid var(--neutral-200);
  margin-bottom: 2rem;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb .sep {
  margin-inline: 0.5rem;
  opacity: 0.5;
}

/* ---- Visually hidden (screen-reader only) ---- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Utility spacing ---- */
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }

/* ---- References hero (inverted band) ---- */
.page-hero-inverted {
  background: var(--primary-900);
  color: var(--neutral-50);
  padding: 2.5rem;
  margin-bottom: 3rem;
  border-radius: var(--radius);
}

.page-hero-inverted .eyebrow {
  color: rgba(202, 213, 225, 0.7);
}

.page-hero-inverted h1 {
  color: var(--neutral-50);
}

.page-hero-inverted p {
  color: #C8D2DE;
  max-width: 55ch;
}

/* ---- About page h2-as-h1 ---- */
.about-h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.005em;
  color: var(--text);
}

/* ---- CTA row centered ---- */
.cta-row-center {
  justify-content: center;
}

/* ---- Effects list (side-effects) ---- */
.effects-list-block {
  list-style: disc;
  padding-left: 1.75rem;
  max-width: var(--measure);
  margin-top: 1rem;
}

.effects-list-block li {
  margin-bottom: 0.35em;
}

/* ---- Callout with top margin ---- */
.callout-mt {
  margin-top: 2rem;
}

/* ---- 404 Page ---- */
.page-404 {
  text-align: center;
  padding-block: 6rem;
}

.page-404 h1 {
  font-size: clamp(4rem, 10vw, 8rem);
  color: var(--primary);
  opacity: 0.25;
  line-height: 1;
  margin-bottom: 1rem;
}

.page-404 h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

/* ---- Section spacing ---- */
.section-block {
  margin-bottom: 3rem;
}

.section-block > h2 {
  margin-bottom: 1rem;
}

/* ---- Stacks / compounds page ---- */
.stack-intro {
  background: var(--primary-50);
  border: 1px solid var(--neutral-200);
  border-top: 2px solid var(--primary);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 2rem;
  max-width: 52rem;
}

/* ---- Side effects highlight ---- */
.effects-list li {
  list-style: disc;
  margin-left: 1.5rem;
  margin-bottom: 0.35em;
}

/* ---- Tippy overrides ---- */
.tippy-box {
  background: var(--primary-900);
  color: var(--neutral-50);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  border-radius: var(--radius);
  max-width: 28rem !important;
}

.tippy-box .tippy-arrow {
  color: var(--primary-900);
}

/* ---- Progress bar ---- */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--primary);
  width: 0%;
  z-index: 999;
  transition: width 50ms linear;
  pointer-events: none;
}

/* ============================================================
   Responsive — 768px
   ============================================================ */
@media (min-width: 768px) {
  .hero-band .container {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .hero-content {
    max-width: none;
  }

  .hero-plate-img {
    max-width: 100%;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .nav-toggle {
    display: none !important;
  }
}

/* ============================================================
   Responsive — 1024px
   ============================================================ */
@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================================
   Mobile nav
   ============================================================ */
@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    padding-top: 0.75rem;
    border-top: 1px solid var(--neutral-200);
    margin-top: 0.5rem;
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0.1rem;
  }

  .site-nav a {
    display: block;
    padding: 0.5rem 0.25rem;
    font-size: 0.8rem;
  }

  .site-header .container {
    flex-wrap: wrap;
  }
}

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