/* ===========================================================
   NINMENI Research Lab — design tokens
   Color:
     --bg          #0a0c10  base background
     --bg-alt      #0e1117  alternate section background
     --ink         #e8eaed  primary text
     --ink-dim     #9aa3ad  secondary text
     --ink-faint   #5b6470  tertiary / labels
     --line        #1c212b  hairlines
     --accent      #5b8def  grounded / structural accent (blue)
     --accent-warm #d9a86c  inquiry / epistemic accent (amber)
   Type:
     display: Source Serif 4   (research-paper authority)
     body:    Inter            (clean, neutral)
     data:    IBM Plex Mono    (diagnostics, status, labels)
   =========================================================== */

:root {
  --bg: #0a0c10;
  --bg-alt: #0d1015;
  --ink: #e8eaed;
  --ink-dim: #98a1ad;
  --ink-faint: #5b6472;
  --line: #1d2230;
  --accent: #6e93e8;
  --accent-warm: #d6a877;

  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}

.narrow {
  max-width: 720px;
}

/* ---------- background graph field ---------- */

.bg-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-field::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(110, 147, 232, 0.10), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 30%, rgba(214, 168, 119, 0.06), transparent 60%);
}

#graphCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
}

/* ---------- header ---------- */

.site-header {
  position: relative;
  z-index: 10;
  padding: 28px 0;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.wordmark {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.22em;
  font-weight: 500;
  color: var(--ink);
}

.header-contact {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

.header-contact:hover,
.header-contact:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink-faint);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 18px;
}

.lang-toggle {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 5px 10px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
  color: var(--ink);
  border-color: var(--ink-faint);
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  z-index: 1;
  padding: 96px 0 88px;
}

.hero-inner {
  max-width: 760px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin: 0 0 22px;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
}

.hero-sub {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  color: var(--ink-dim);
  margin: 0 0 28px;
  font-weight: 400;
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--ink-dim);
  max-width: 620px;
  margin: 0 0 40px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  padding: 13px 22px;
  border-radius: 3px;
  text-decoration: none;
  border: 1px solid var(--line);
  transition: border-color 0.2s, background-color 0.2s, color 0.2s;
}

.btn-primary {
  color: var(--bg);
  background: var(--ink);
  border-color: var(--ink);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: #06080d;
}

.btn-ghost {
  color: var(--ink-dim);
  background: transparent;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--ink);
  border-color: var(--ink-faint);
}

/* ---------- sections ---------- */

.section {
  position: relative;
  z-index: 1;
  padding: 84px 0;
  border-top: 1px solid var(--line);
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 36px;
  letter-spacing: -0.01em;
}

.section-note {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  margin: -18px 0 36px;
  text-transform: uppercase;
}

.lede {
  font-size: 1.0625rem;
  color: var(--ink-dim);
  max-width: 640px;
}

/* ---------- research focus cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.card {
  background: var(--bg);
  padding: 28px 26px;
}

.card-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

.card h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 10px;
  line-height: 1.3;
}

.card p {
  font-size: 0.9375rem;
  color: var(--ink-dim);
  margin: 0;
}

/* ---------- not-list ---------- */

.not-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 480px;
  border-top: 1px solid var(--line);
}

.not-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.9375rem;
  color: var(--ink-dim);
  position: relative;
  padding-left: 28px;
}

.not-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}

.not-list.open-list {
  max-width: 100%;
}

.not-list.open-list li {
  line-height: 1.5;
}

/* ---------- status grid ---------- */

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.status-item {
  background: var(--bg-alt);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-alt .status-item {
  background: var(--bg);
}

.status-value {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--ink);
}

.status-flag .status-value {
  color: var(--accent);
}

.status-target .status-value {
  color: var(--accent-warm);
}

.status-label {
  font-size: 0.8125rem;
  color: var(--ink-dim);
  line-height: 1.4;
}

/* ---------- architecture pipeline ---------- */

.pipeline {
  display: flex;
  flex-wrap: wrap;
  border: 1px solid var(--line);
  background: var(--bg);
}

.pipeline-step {
  flex: 1 1 160px;
  padding: 22px 18px;
  font-size: 0.8125rem;
  color: var(--ink-dim);
  line-height: 1.45;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.pipeline-step:last-child {
  border-right: none;
}

.pipeline-step strong {
  display: block;
  font-family: var(--serif);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

/* ---------- FAQ ---------- */

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}

.faq-item:first-of-type {
  border-top: 1px solid var(--line);
}

.faq-item summary {
  font-family: var(--serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 28px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--mono);
  color: var(--ink-faint);
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  margin: 12px 0 0;
  color: var(--ink-dim);
  font-size: 0.9375rem;
  max-width: 620px;
}

/* ---------- contact ---------- */

.contact-email {
  display: inline-block;
  margin-top: 24px;
  font-family: var(--mono);
  font-size: 1.0625rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-faint);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.contact-email:hover,
.contact-email:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

/* ---------- footer ---------- */

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 32px 0;
}

.site-footer p {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  margin: 0;
}

/* ---------- focus visibility ---------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- responsive ---------- */

@media (max-width: 1080px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 880px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .status-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .container { padding: 0 22px; }
  .hero { padding: 64px 0 56px; }
  .card-grid { grid-template-columns: 1fr; }
  .status-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .btn { width: 100%; justify-content: center; }
  .pipeline-step {
    flex: 1 1 100%;
    border-right: none;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  #graphCanvas { display: none; }
}