/* Yoni Neff — Digital Monograph design system
   Tokens per uploads/DESIGN.md */

:root {
  /* Surfaces — fine stationery layers */
  --surface: #fcf9f4;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f6f3ee;
  --surface-container: #efece6;
  --surface-container-high: #e9e5df;
  --surface-container-highest: #e5e2dd;

  /* Text */
  --on-surface: #1c1c19;
  --on-surface-variant: #5c5a54;
  --on-surface-muted: #8a877f;

  /* Primary — sage */
  --primary: #44664a;
  --primary-container: #7a9e7e;
  --on-primary: #fcf9f4;

  /* Outline */
  --outline: #c8c3b9;
  --outline-variant: #d8d3c9;

  /* Accent (tweakable) */
  --accent-h: 140;
  --accent-c: 0.045;
  --accent-l: 38%;

  /* Radii */
  --radius-sm: 0.125rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.625rem;
  --radius-full: 9999px;

  /* Density (tweakable) */
  --density-scale: 1;
  --section-y: calc(9rem * var(--density-scale));
  --card-pad: calc(2rem * var(--density-scale));

  /* Type (tweakable) */
  --font-display: "Fraunces", "Newsreader", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }

::selection { background: var(--primary); color: var(--on-primary); }

/* ---------- Typography scale ---------- */

.display-xl {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(3.5rem, 7vw, 6.5rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
}
.display-lg {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.75rem, 5vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
}
.display-md {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 3.4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.display-sm {
  font-family: var(--font-display);
  font-weight: 350;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
}
.headline-sm {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.375rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.italic-emph {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
}
.body-lg {
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--on-surface);
}
.body-md {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--on-surface);
}
.body-sm {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
}
.label-md {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--on-surface-variant);
}
.label-sm {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--on-surface-muted);
}
.catalog-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--on-surface-muted);
}

/* ---------- Layout ---------- */

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
}
.container-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
}
.section {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
}
.section-tight { padding-top: 4rem; padding-bottom: 4rem; }

/* ---------- Nav dropdown ---------- */

.nav-dropdown {
  position: relative;
}
.nav-dropdown > .nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.nav-dropdown > .nav-link::after {
  content: "";
  display: inline-block;
  width: 5px; height: 5px;
  border-right: 1.2px solid currentColor;
  border-bottom: 1.2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  opacity: 0.55;
  transition: transform 0.2s ease;
}
.nav-dropdown:hover > .nav-link::after {
  transform: rotate(-135deg) translateY(-2px);
}
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.75rem);
  left: 50%;
  transform: translateX(-50%);
  background: color-mix(in oklab, var(--surface) 97%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-6px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 60;
  box-shadow: 0 8px 32px -8px rgba(28,28,25,0.12);
}
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu a {
  display: block;
  padding: 0.55rem 0.9rem;
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  border-radius: calc(var(--radius-md) - 2px);
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
  letter-spacing: 0.04em;
}
.nav-dropdown-menu a:hover {
  background: var(--surface-container);
  color: var(--on-surface);
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: color-mix(in oklab, var(--surface) 80%, transparent);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem clamp(1.5rem, 4vw, 3rem);
  max-width: 1280px;
  margin: 0 auto;
}
.nav-logo {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
}
.nav-logo .dot {
  width: 5px; height: 5px; border-radius: 999px;
  background: var(--primary);
  display: inline-block;
  transform: translateY(-2px);
  margin: 0 2px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}
.nav-link {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--on-surface-variant);
  transition: color 0.2s ease;
  position: relative;
}
.nav-link:hover { color: var(--on-surface); }
.nav-link.active { color: var(--on-surface); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px;
  background: var(--primary);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
  font-family: var(--font-body);
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
  color: var(--on-primary);
}
.btn-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, var(--primary-container) 0%, var(--primary-container) 100%);
}
.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid color-mix(in oklab, var(--outline) 60%, transparent);
  padding: calc(0.75rem - 1px) calc(1.25rem - 1px);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--primary);
  padding: 0.5rem 0;
  border-bottom: 1px solid color-mix(in oklab, var(--primary) 30%, transparent);
  transition: border-color 0.2s ease, gap 0.2s ease;
  width: fit-content;
}
.link-arrow:hover {
  border-color: var(--primary);
  gap: 0.75rem;
}
.link-arrow .arrow { transition: transform 0.2s ease; }
.link-arrow:hover .arrow { transform: translateX(3px); }

/* ---------- Form ---------- */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.5rem 0 0.75rem;
  border-bottom: 1px solid var(--outline-variant);
  transition: border-color 0.2s ease;
}
.field:focus-within {
  border-bottom-color: var(--primary);
}
.field label {
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--on-surface-muted);
}
.field input,
.field textarea,
.field select {
  border: none;
  background: transparent;
  outline: none;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--on-surface);
  padding: 0.375rem 0;
  resize: vertical;
}
.field textarea { min-height: 7rem; }
.field select {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 350;
  color: var(--on-surface);
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%2344664a' stroke-width='1.5' stroke-linecap='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.25rem center;
  padding-right: 1.5rem;
  cursor: pointer;
}

/* ---------- Chips ---------- */

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.9rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  font-weight: 500;
  color: var(--on-surface-variant);
  background: var(--surface-container-high);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
  border: none;
  font-family: var(--font-body);
}
.chip:hover {
  color: var(--on-surface);
  background: var(--surface-container-highest);
}
.chip.active {
  background: var(--primary);
  color: var(--on-primary);
}

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

.footer {
  background: var(--surface-container-low);
  padding: 5rem 0 2rem;
  margin-top: 6rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
}
.footer-col h4 {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--on-surface-muted);
  margin: 0 0 1.25rem;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.75rem; }
.footer-col a { color: var(--on-surface-variant); font-size: 0.9375rem; transition: color 0.2s ease; }
.footer-col a:hover { color: var(--on-surface); }
.footer-bottom {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8125rem;
  color: var(--on-surface-muted);
  border-top: 1px solid color-mix(in oklab, var(--outline-variant) 40%, transparent);
}

.footer-wordmark {
  padding: 3rem 0 2rem;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(3rem, 9vw, 7rem);
  line-height: 1;
  color: color-mix(in oklab, var(--on-surface) 10%, transparent);
  display: flex;
  justify-content: space-around;
  gap: 2rem;
  flex-wrap: wrap;
  background: var(--surface-container-highest);
  text-align: center;
}

/* ---------- Tonal blocks (imagery placeholders) ---------- */

.tonal {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
}
.tonal::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    color-mix(in oklab, var(--on-surface) 3%, transparent),
    color-mix(in oklab, var(--on-surface) 3%, transparent) 1px,
    transparent 1px,
    transparent 8px
  );
  opacity: 0.7;
  pointer-events: none;
}
.tonal-sage { background: color-mix(in oklab, var(--primary) 75%, var(--surface-container)); }
.tonal-deep { background: #2a3d2e; }
.tonal-sand { background: var(--surface-container-highest); }
.tonal-paper { background: var(--surface-container-low); }
.tonal-ink { background: #1c1c19; }

.tonal-label {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: color-mix(in oklab, currentColor 60%, transparent);
  z-index: 2;
}
.tonal-deep .tonal-label,
.tonal-ink .tonal-label { color: color-mix(in oklab, #fff 50%, transparent); }

/* Abstract "portrait" silhouette */
.portrait {
  position: relative;
  aspect-ratio: 4/5;
  background: linear-gradient(160deg, #3a5540 0%, #2a3d2e 100%);
  overflow: hidden;
  border-radius: var(--radius-md);
}
.portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.025),
    rgba(255,255,255,0.025) 1px,
    transparent 1px,
    transparent 6px
  );
}
.portrait-silhouette {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 75%;
  aspect-ratio: 1/1.3;
}
.portrait-silhouette svg { width: 100%; height: 100%; }
.portrait-caption {
  position: absolute;
  top: 1rem;
  left: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  z-index: 2;
}

/* ---------- Reveal on scroll ---------- */

.reveal {
  opacity: 1;
  transform: translateY(0);
}
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

/* ---------- Tweaks panel ---------- */

.tweaks {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  width: 300px;
  background: color-mix(in oklab, var(--surface) 95%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 40px -12px rgba(28,28,25,0.15);
  padding: 1.25rem;
  z-index: 100;
  font-family: var(--font-body);
  display: none;
}
.tweaks.open { display: block; }
.tweaks h4 {
  margin: 0 0 1rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--on-surface-muted);
  display: flex;
  justify-content: space-between;
}
.tweak-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.tweak-row > span {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
}
.tweak-swatches {
  display: flex;
  gap: 0.5rem;
}
.tweak-swatch {
  width: 28px; height: 28px;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease;
}
.tweak-swatch.active { border-color: var(--on-surface); }
.tweak-seg {
  display: flex;
  background: var(--surface-container);
  border-radius: var(--radius-sm);
  padding: 3px;
}
.tweak-seg button {
  flex: 1;
  padding: 0.5rem 0.5rem;
  border: none;
  background: transparent;
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  cursor: pointer;
  border-radius: calc(var(--radius-sm) + 1px);
  font-family: var(--font-body);
  letter-spacing: 0.04em;
}
.tweak-seg button.active {
  background: var(--surface);
  color: var(--on-surface);
  box-shadow: 0 1px 2px rgba(28,28,25,0.04);
}

/* ---------- Misc ---------- */

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--primary);
}
.divider-gap { height: 2rem; }
.rule-dot {
  display: inline-block;
  width: 3px; height: 3px; border-radius: 999px;
  background: currentColor;
  margin: 0 0.5rem;
  transform: translateY(-3px);
}

.pull-quote {
  font-family: var(--font-display);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--on-surface);
}

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

/* Medium — tight desktop / large tablet */
@media (max-width: 1100px) {
  .nav-links { gap: 1.25rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}

/* Small — tablet / narrow browser */
@media (max-width: 900px) {
  .nav-links { gap: 0.75rem; }
  .nav-link:not(.active):not(.btn) { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  :root { --density-scale: 0.7; }
}

/* Extra small — mobile */
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; }
  .container,
  .container-narrow { padding: 0 clamp(1.25rem, 5vw, 1.75rem); }
}