/* ─── Threshold ─── */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400;500;600&family=IBM+Plex+Sans:wght@300;400;500;600&family=Cormorant+Garamond:ital,wght@0,300;0,600;1,300;1,600&display=swap');

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

:root {
  --black: #080808;
  --white: #ffffff;
  --fg: #ffffff;
  --fg-muted: rgba(255,255,255,0.68);
  --fg-meta: rgba(255,255,255,0.42);
  --fg-dim: rgba(255,255,255,0.28);
  --fg-faint: rgba(255,255,255,0.12);
  --fg-hair: rgba(255,255,255,0.06);
  --line: rgba(255,255,255,0.18);
  --line-faint: rgba(255,255,255,0.10);

  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', 'SF Mono', Menlo, monospace;

  --gutter: clamp(24px, 6vw, 64px);
  --section-y: clamp(80px, 10vw, 128px);
  --max-page: 1280px;
  --measure: 62ch;
}

html {
  background: var(--black);
  color: var(--fg);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  font-weight: 300;
  font-size: 17px;
  line-height: 1.75;
}

/* ─── Grain ─── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.55;
  mix-blend-mode: overlay;
}

/* ─── Header (inner pages) ─── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px var(--gutter);
  max-width: var(--max-page);
  margin: 0 auto;
}

.mark-link {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.mark-bar {
  display: block;
  width: 40px;
  height: 3px;
  background: var(--fg);
}

.mark-text {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-meta);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s;
}

.nav-link:hover { color: var(--fg); }
.nav-link.active { color: var(--fg); border-bottom-color: var(--fg); }

.nav-cta {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg);
  text-decoration: none;
  padding: 9px 20px;
  border: 1px solid var(--fg);
  transition: background 0.08s linear, color 0.08s linear;
}

.nav-cta:hover {
  background: var(--fg);
  color: var(--black);
}

/* ─── Footer ─── */
.site-footer {
  max-width: var(--max-page);
  margin: 0 auto;
  padding: clamp(40px, 5vw, 64px) var(--gutter) 40px;
}

.footer-rule {
  width: 100%;
  height: 3px;
  background: var(--fg);
  margin-bottom: 28px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.footer-link {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-meta);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover { color: var(--fg); }

/* ─── Section label ─── */
.section-label {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 28px;
}

.section-marker {
  color: var(--fg-meta);
  margin-right: 10px;
}

/* ─── Epigraph ─── */
.epigraph {
  border-top: 1px solid var(--fg-faint);
  padding-top: 1.25rem;
}

.epigraph-text {
  font-family: var(--serif);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.65;
  color: var(--fg-meta);
  margin-bottom: 0.6rem;
}

.epigraph-source {
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 300;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

/* ─── Triple grid ─── */
.triple-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* ─── Scroll reveal ─── */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.8s cubic-bezier(0.16,1,0.3,1),
              transform 0.8s cubic-bezier(0.16,1,0.3,1);
}

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

/* ─── Buttons ─── */
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 28px;
  border: 1px solid var(--fg);
  cursor: pointer;
  transition: background 0.08s linear, color 0.08s linear;
  outline: none;
}

.btn-solid {
  background: var(--fg);
  color: var(--black);
}

.btn-solid:hover {
  background: transparent;
  color: var(--fg);
}

.btn-outline {
  background: transparent;
  color: var(--fg);
}

.btn-outline:hover {
  background: var(--fg);
  color: var(--black);
}

/* ─── Form fields (boxed style) ─── */
.field-label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 12px;
}

.field-input {
  display: block;
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg);
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 300;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.2s;
  border-radius: 0;
  -webkit-appearance: none;
}

.field-input:focus { border-color: var(--fg-meta); }
.field-input::placeholder { color: var(--fg-dim); }

textarea.field-input {
  resize: vertical;
  min-height: 80px;
  line-height: 1.55;
}

/* ─── Radio ─── */
.field-options { display: flex; gap: 2rem; }
.field-options-col { display: flex; flex-direction: column; gap: 0.75rem; }

.field-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.field-option input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border: 1px solid var(--fg-meta);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  flex-shrink: 0;
}

.field-option input[type="radio"]:checked {
  border-color: var(--fg);
  background: var(--fg);
}

.field-option span {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 300;
  color: var(--fg-muted);
  transition: color 0.15s;
}

.field-option input[type="radio"]:checked + span {
  color: var(--fg);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .site-header {
    flex-direction: column;
    gap: 16px;
    padding-top: 20px;
    padding-bottom: 20px;
  }
  .site-nav { gap: 20px; }
}

@media (min-width: 768px) {
  .triple-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: clamp(24px, 4vw, 48px);
  }
}