/* ==========================================================================
   Zevoraplex — shared stylesheet
   Tokens: ink (near-black blue), paper (grey-sage neutral), brass + moss accents
   Type: Fraunces (display) / IBM Plex Sans (body) / IBM Plex Mono (systems/label)
   ========================================================================== */

:root {
  /* color */
  --ink: #0f1420;
  --ink-2: #1b2233;
  --ink-3: #262f45;
  --paper: #e7e9e2;
  --paper-raised: #f1f2ec;
  --text: #171b24;
  --muted: #565c54;
  --muted-on-ink: #9aa3b8;
  --line: #cdccbf;
  --line-dark: #2a3142;
  --brass: #a47c3b;
  --brass-bright: #c79a52;
  --brass-text: #7c5a22; /* AA-safe brass for small text on paper; brass/brass-bright stay for borders + on-ink */
  --moss: #3f5642;
  --moss-bright: #5c7a5f;

  /* type */
  --f-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --f-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* scale */
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2: clamp(1.75rem, 1.5rem + 1.2vw, 2.375rem);
  --step-3: clamp(2.25rem, 1.8rem + 2vw, 3.5rem);
  --step-4: clamp(2.75rem, 2.1rem + 3vw, 4.75rem);

  --maxw: 1200px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 2px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}
body { margin: 0; }
img, svg { display: block; max-width: 100%; }
ul { padding: 0; margin: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, p, figure { margin: 0; }

body {
  background: var(--paper);
  color: var(--text);
  font-family: var(--f-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

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

.eyebrow {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass-text);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.on-ink .eyebrow { color: var(--brass-bright); }
.eyebrow::before {
  content: "";
  width: 1.4em;
  height: 1px;
  background: currentColor;
  display: inline-block;
}

h1, h2, h3 { font-family: var(--f-display); font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: var(--step-4); line-height: 1.04; font-optical-sizing: auto; }
h2 { font-size: var(--step-3); line-height: 1.08; }
h3 { font-size: var(--step-2); line-height: 1.18; }
h4 { font-size: var(--step-1); font-family: var(--f-body); font-weight: 600; }

.lede { font-size: var(--step-1); color: var(--muted); max-width: 46ch; }

.section { padding-block: clamp(3.5rem, 8vw, 7rem); }
.section-head { max-width: 62ch; margin-bottom: clamp(2rem, 5vw, 3.5rem); display: grid; gap: 1rem; }

.on-ink { background: var(--ink); color: var(--paper); }
.on-ink .muted, .on-ink p { color: var(--muted-on-ink); }
.on-ink h1, .on-ink h2, .on-ink h3, .on-ink h4 { color: var(--paper-raised); }

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

hr.rule { border: none; border-top: 1px solid var(--line); margin: 0; }
.on-ink hr.rule { border-top-color: var(--line-dark); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.95em 1.6em;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper-raised);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--ink-3); border-color: var(--ink-3); }
.on-ink .btn-primary { background: var(--brass); color: var(--ink); border-color: var(--brass); }
.on-ink .btn-primary:hover { background: var(--brass-bright); border-color: var(--brass-bright); }

.btn-ghost { background: transparent; color: var(--text); }
.btn-ghost:hover { border-color: var(--brass); color: var(--brass-text); }
.on-ink .btn-ghost { color: var(--paper-raised); }
.on-ink .btn-ghost:hover { color: var(--brass-bright); border-color: var(--brass-bright); }

/* ---------- nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(231, 233, 226, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.1rem;
}
.wordmark {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.wordmark .mark { width: 26px; height: 26px; color: var(--ink); }
.on-ink .wordmark .mark, .footer-wordmark .mark { color: var(--brass-bright); }
.brand-mark circle { fill: currentColor; }
.brand-mark line { stroke: currentColor; opacity: 0.6; }
.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 2vw, 2.1rem);
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav-links a { position: relative; padding-block: 0.3rem; }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--brass);
  transition: right 180ms ease;
}
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { right: 0; }
.nav-links a[aria-current="page"] { color: var(--brass-text); }
.nav-links a:hover { color: var(--brass-text); }
.nav-cta { display: none; }
.nav-toggle {
  display: inline-flex;
  background: none;
  border: 1px solid var(--line);
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius);
}
.nav-toggle-icon, .nav-toggle-icon::before, .nav-toggle-icon::after {
  content: "";
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  position: relative;
}
.nav-toggle-icon::before { position: absolute; top: -6px; }
.nav-toggle-icon::after { position: absolute; top: 6px; }

@media (min-width: 860px) {
  .nav-toggle { display: none; }
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
}
@media (max-width: 859px) {
  .nav-links {
    position: absolute;
    inset: 100% 0 auto 0;
    background: var(--paper-raised);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem var(--gutter) 2rem;
    gap: 1.1rem;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-cta { display: none; }
}

/* ---------- hero / plexus ---------- */
.hero {
  padding-block: clamp(3rem, 9vw, 6.5rem) clamp(2.5rem, 6vw, 4rem);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4rem);
  align-items: center;
}
@media (min-width: 960px) {
  .hero-grid { grid-template-columns: 1.05fr 0.95fr; }
}
.hero-copy { display: grid; gap: 1.5rem; }
.hero-copy h1 { max-width: 14ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.5rem; }

.plexus-figure { position: relative; }
.plexus-figure svg { width: 100%; height: auto; }
.plexus-node circle { fill: var(--ink); }
.plexus-node text {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  fill: var(--ink);
  text-transform: uppercase;
}
.plexus-line {
  stroke: var(--brass);
  stroke-width: 1;
  opacity: 0.55;
  stroke-dasharray: 4 3;
}
.on-ink .plexus-node circle { fill: var(--paper-raised); }
.on-ink .plexus-node text { fill: var(--paper-raised); }
.on-ink .plexus-line { stroke: var(--brass-bright); }

@keyframes drift {
  from { transform: translateY(0); }
  50% { transform: translateY(-6px); }
  to { transform: translateY(0); }
}
.plexus-node { animation: drift 7s ease-in-out infinite; transform-origin: center; }
.plexus-node:nth-child(2n) { animation-duration: 8.5s; animation-delay: -1.5s; }
.plexus-node:nth-child(3n) { animation-duration: 6.2s; animation-delay: -3s; }

/* ---------- stat strip ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  padding-block: clamp(2rem, 5vw, 3rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
@media (min-width: 720px) { .stat-strip { grid-template-columns: repeat(4, 1fr); } }
.stat b {
  display: block;
  font-family: var(--f-display);
  font-size: var(--step-2);
  font-weight: 600;
  color: var(--ink);
}
.on-ink .stat b { color: var(--paper-raised); }
.stat span {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
}
.on-ink .stat span { color: var(--muted-on-ink); }

/* ---------- card grids ---------- */
.grid { display: grid; gap: clamp(1.25rem, 3vw, 1.75rem); }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  display: grid;
  gap: 0.9rem;
  align-content: start;
}
.card .index {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--brass-text);
  letter-spacing: 0.08em;
}
.on-ink .card .index { color: var(--brass-bright); }
.card ul { display: grid; gap: 0.5rem; margin-top: 0.25rem; }
.card ul li {
  padding-left: 1.1em;
  position: relative;
  color: var(--muted);
  font-size: 0.95rem;
}
.card ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.65em;
  width: 5px; height: 5px;
  background: var(--moss);
  border-radius: 50%;
}

/* ---------- timeline (genuine sequence: numbered) ---------- */
.timeline { display: grid; gap: 0; }
.timeline-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.5rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--line);
}
.on-ink .timeline-item { border-top-color: var(--line-dark); }
.timeline-item:last-child { border-bottom: 1px solid var(--line); }
.on-ink .timeline-item:last-child { border-bottom-color: var(--line-dark); }
.timeline-num { font-family: var(--f-mono); color: var(--brass); font-size: 0.9rem; padding-top: 0.2rem; }
.timeline-body { display: grid; gap: 0.4rem; }
@media (min-width: 720px) {
  .timeline-item { grid-template-columns: 6rem 1fr 1fr; }
  .timeline-body { grid-column: 2 / 4; display: grid; grid-template-columns: 1fr 1.4fr; gap: 2rem; }
}

/* ---------- quote ---------- */
.quote-block { display: grid; gap: 1.5rem; max-width: 52rem; }
.quote-block blockquote {
  font-family: var(--f-display);
  font-style: italic;
  font-size: var(--step-2);
  line-height: 1.3;
  font-weight: 500;
}
.quote-block cite {
  font-style: normal;
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--brass-text);
  display: block;
}

/* ---------- article / insight cards ---------- */
.article-card {
  display: grid;
  gap: 0.75rem;
  padding-block: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}
.article-card:last-child { border-bottom: 1px solid var(--line); }
.article-meta {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.article-tag {
  color: var(--moss);
  border: 1px solid var(--moss);
  padding: 0.15em 0.6em;
  border-radius: 999px;
}
.article-card h3 a:hover { color: var(--brass-text); }
.article-card .read-more {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.article-card .read-more:hover { color: var(--brass-text); }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2rem;
}
.filter-chip {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.5em 1em;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  transition: all 140ms ease;
}
.filter-chip:hover { border-color: var(--brass); color: var(--brass-text); }
.filter-chip[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper-raised);
}

/* ---------- forms ---------- */
.form-grid { display: grid; gap: 1.25rem; max-width: 42rem; }
@media (min-width: 640px) {
  .form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
}
.field { display: grid; gap: 0.5rem; }
.field label {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.field input, .field select, .field textarea {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85em 1em;
  font-family: var(--f-body);
}
.field textarea { resize: vertical; min-height: 8rem; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--brass);
}
.field-error {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: #8a3b2b;
  min-height: 1.1em;
}
.form-status {
  font-family: var(--f-mono);
  font-size: 0.85rem;
  padding: 1em;
  border: 1px dashed var(--line);
  display: none;
}
.form-status.is-visible { display: block; }
.form-status.is-success { border-color: var(--moss); color: var(--moss); }

/* ---------- footer ---------- */
.site-footer { padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; }
.footer-grid {
  display: grid;
  gap: 2.5rem;
  padding-bottom: 3rem;
}
@media (min-width: 720px) {
  .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
}
.footer-col h4 {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-on-ink);
  margin-bottom: 1rem;
  font-weight: 500;
}
.footer-col ul { display: grid; gap: 0.65rem; }
.footer-col a:hover { color: var(--brass-bright); }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.75rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--muted-on-ink);
}

/* ---------- cta band ---------- */
.cta-band { text-align: left; display: grid; gap: 1.75rem; }
@media (min-width: 780px) {
  .cta-band { grid-template-columns: 1fr auto; align-items: center; }
}

/* ---------- utility ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.75em 1.25em;
  z-index: 100;
}
.skip-link:focus { left: var(--gutter); top: var(--gutter); }

.tag-list { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.tag {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 0.4em 0.9em;
  border-radius: 999px;
  color: var(--muted);
}