/* ==========================================================================
   Metis Lab — Design tokens & base styles
   ========================================================================== */

:root {
  --ivory: #F4F0E8;
  --charcoal: #252525;
  --ink: #111827;
  --stone: #D7D1C6;
  --accent: #7D8A73;

  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --max-width: 1120px;
  --measure: 62ch;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ivory);
  color: var(--charcoal);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--ink);
  line-height: 1.15;
  font-weight: 500;
  margin: 0 0 0.5em 0;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 600; }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
  margin: 0 0 1em 0;
  max-width: var(--measure);
}

a {
  color: inherit;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.eyebrow {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1em;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--charcoal);
  opacity: 0.6;
  margin-bottom: 1em;
  display: block;
}

hr, .rule {
  border: none;
  border-top: 1px solid var(--stone);
  margin: 0;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 240, 232, 0.92);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--stone);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 2.2rem;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--charcoal);
  position: relative;
}

.main-nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.main-nav a.btn-primary {
  color: var(--ivory);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.2rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

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

.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.85em 1.6em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

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

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

.btn:hover { opacity: 0.78; }

.btn-nav {
  padding: 0.6em 1.3em;
  font-size: 0.88rem;
}

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

.hero {
  padding: 7rem 0 5rem;
}

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

.hero-actions {
  display: flex;
  gap: 1rem;
  margin: 2.2rem 0 1.5rem;
  flex-wrap: wrap;
}

.hero-note {
  font-size: 0.88rem;
  color: var(--charcoal);
  opacity: 0.65;
}

.page-hero {
  padding: 6rem 0 4rem;
  border-bottom: 1px solid var(--stone);
}

.page-hero .container { max-width: 760px; }

/* ---------------------------------- Sections ---------------------------------- */

section {
  padding: 5rem 0;
}

section + section {
  border-top: 1px solid var(--stone);
}

.section-intro {
  max-width: 640px;
  margin-bottom: 3rem;
}

/* ---------------------------------- Grids & cards ---------------------------------- */

.grid {
  display: grid;
  gap: 2.5rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  padding-top: 1.6rem;
  border-top: 1px solid var(--stone);
}

.card .index {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.6rem;
}

.tags {
  font-size: 0.82rem;
  opacity: 0.65;
  margin-top: 0.5rem;
}

.key-questions {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
}

.key-questions li {
  font-size: 0.92rem;
  padding: 0.7em 0 0.7em 1.3em;
  position: relative;
  border-top: 1px solid var(--stone);
  opacity: 0.88;
}

.key-questions li:first-child {
  border-top: none;
  padding-top: 0;
}

.key-questions li::before {
  content: "—";
  position: absolute;
  left: 0;
  opacity: 0.55;
}

.list-item {
  padding: 2.2rem 0;
  border-bottom: 1px solid var(--stone);
}

.list-item:first-child {
  border-top: 1px solid var(--stone);
}

.list-item .meta {
  font-size: 0.85rem;
  opacity: 0.65;
  margin: 0.3em 0 0.8em;
}

.list-item .link {
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
}

/* ---------------------------------- Filters ---------------------------------- */

.filters {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.filter-btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  background: transparent;
  border: 1px solid var(--stone);
  padding: 0.5em 1.1em;
  border-radius: 999px;
  cursor: pointer;
  color: var(--charcoal);
}

.filter-btn[aria-pressed="true"] {
  background: var(--ink);
  color: var(--ivory);
  border-color: var(--ink);
}

/* ---------------------------------- Dark panel ---------------------------------- */

.panel-dark {
  background: var(--ink);
  color: var(--ivory);
}

.panel-dark h2, .panel-dark h3 { color: var(--ivory); }
.panel-dark .btn-secondary { color: var(--ivory); border-color: var(--ivory); }
.panel-dark .btn-primary { background: var(--ivory); color: var(--ink); }
.panel-dark .section-label { color: var(--ivory); opacity: 0.55; }

/* ---------------------------------- Forms ---------------------------------- */

.form-grid {
  display: grid;
  gap: 1.4rem;
  max-width: 560px;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5em;
}

input, textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.75em 0.9em;
  border: 1px solid var(--stone);
  border-radius: 2px;
  background: #fff;
  color: var(--charcoal);
}

textarea { min-height: 130px; resize: vertical; }

.form-note {
  font-size: 0.88rem;
  opacity: 0.7;
  margin-top: -0.4rem;
}

.form-success {
  display: none;
  padding: 1.2em;
  border: 1px solid var(--accent);
  background: rgba(125, 138, 115, 0.1);
  font-size: 0.95rem;
}

/* ---------------------------------- Person card ---------------------------------- */

.person-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1.8rem;
  padding: 2rem 0;
  border-top: 1px solid var(--stone);
  align-items: start;
}

.person-photo {
  width: 100%;
  aspect-ratio: 1;
  background: var(--stone);
  border-radius: 2px;
  object-fit: cover;
  display: block;
}

.person-role {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.6em;
}

.empty-note {
  padding: 1.6rem 0;
  border-top: 1px solid var(--stone);
  opacity: 0.6;
  font-style: italic;
}

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

.site-footer {
  background: var(--ink);
  color: var(--ivory);
  padding: 3.5rem 0 2rem;
}

.site-footer .footer-top {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(244, 240, 232, 0.18);
}

.site-footer .footer-desc {
  max-width: 360px;
  opacity: 0.8;
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  font-size: 0.92rem;
}

.footer-links a { text-decoration: none; opacity: 0.85; }
.footer-links a:hover { opacity: 1; }

.footer-legal {
  padding-top: 1.6rem;
  font-size: 0.8rem;
  opacity: 0.55;
}

/* ---------------------------------- Responsive ---------------------------------- */

@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .person-card { grid-template-columns: 100px 1fr; }
}

@media (max-width: 720px) {
  .nav-links {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--ivory);
    border-bottom: 1px solid var(--stone);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.5rem 0;
    display: none;
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    width: 100%;
    padding: 0.9rem 32px;
  }

  .nav-links .btn-nav {
    margin: 0.6rem 32px;
  }

  .nav-toggle { display: block; }

  .hero { padding: 4.5rem 0 3rem; }
  section { padding: 3.5rem 0; }
}

/* ---------------------------------- Ambient network canvas ---------------------------------- */

.hero, .page-hero {
  position: relative;
  overflow: hidden;
}

.hero .container, .page-hero .container {
  position: relative;
  z-index: 1;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.55;
  z-index: 0;
}

.panel-dark .hero-canvas {
  opacity: 0.4;
}

/* ---------------------------------- Scroll reveal ---------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------------------------------- Interactive glow ---------------------------------- */

.card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-3px);
}

.list-item {
  transition: background-color 0.2s ease;
}

.btn-primary {
  transition: opacity 0.15s ease, box-shadow 0.25s ease;
}

.btn-primary:hover {
  box-shadow: 0 0 20px rgba(125, 138, 115, 0.4);
}

.person-photo, .filter-btn {
  transition: box-shadow 0.25s ease, background-color 0.2s ease;
}

/* ---------------------------------- Reduced motion ---------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .hero-canvas { display: none; }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  html { scroll-behavior: auto; }
}