/* ===================================================================
   DESIGN TOKENS
   Concept: a senior product designer who thinks in systems.
   The site itself behaves like a design system: tokens, components,
   restraint. Case studies are formatted like specs, not slideshows.
   =================================================================== */

:root {
  /* Color */
  --ink:        #16191D;   /* primary text / dark surfaces */
  --paper:      #FAF8F4;   /* page background, warm paper white */
  --paper-dim:  #F1EEE6;   /* secondary surface */
  --line:       #DEDACD;   /* hairline borders on paper */
  --line-dark:  #2A2E33;   /* hairline borders on ink */
  --slate:      #5B6168;   /* secondary text */
  --slate-dim:  #8A8F94;   /* tertiary text / placeholders */
  --clay:       #A8553D;   /* the one accent — used like a token */
  --clay-dim:   #C98B77;   /* clay, lightened, for dark surfaces */
  --clay-deep:  #7E3F2C;   /* clay, darkened, for hover states */

  /* Type */
  --font-display: "Fraunces", "Iowan Old Style", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", monospace;

  /* Layout */
  --max-width: 1180px;
  --gutter: clamp(24px, 5vw, 64px);
  --radius: 2px; /* near-zero radius: structural, not soft */
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

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

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---- Type scale ---- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}
h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); line-height: 1.02; font-weight: 500; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); line-height: 1.1; }
h3 { font-size: 1.3rem; line-height: 1.3; }

p { margin: 0 0 1.1em; color: var(--slate); max-width: 640px; }
p:last-child { margin-bottom: 0; }

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--slate);
  max-width: 600px;
}

/* ---- Mono labels: the "spec" texture ---- */
.label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-dim);
}
.label.on-dark { color: var(--clay-dim); }

/* ---- Nav ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 248, 244, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 22px;
  padding-bottom: 22px;
}
.nav-mark {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
}
.nav-mark span { color: var(--clay); }
.nav-links {
  display: flex;
  gap: clamp(20px, 3vw, 40px);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.nav-links a { margin-left: clamp(20px, 3vw, 40px); }
.nav-links a:first-child { margin-left: 0; }
.nav-links a {
  color: var(--slate);
  position: relative;
  padding-bottom: 4px;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--clay);
}
.nav-toggle { display: none; }

@media (max-width: 720px) {
  .nav-links {
    position: static;
    gap: 16px;
  }
  .nav-links a { margin-left: 16px; font-size: 11px; }
}

@media (max-width: 480px) {
  .nav-links a { margin-left: 12px; font-size: 10px; }
}

/* ---- Buttons / links-as-action ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 13px 22px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--clay); border-color: var(--clay); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { border-color: var(--clay); color: var(--clay); }
.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---- Section rhythm ---- */
section { padding: clamp(64px, 10vw, 120px) 0; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: clamp(36px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  padding-bottom: 20px;
}
.section-head h2 { flex: 1; }

/* ---- Footer ---- */
.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(56px, 8vw, 96px) 0 32px;
}
.site-footer h2 { color: var(--paper); }
.site-footer .lede { color: var(--slate-dim); }
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  flex-wrap: wrap;
  padding-bottom: 56px;
}
.footer-bottom {
  border-top: 1px solid var(--line-dark);
  margin-top: 32px;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate-dim);
  letter-spacing: 0.04em;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a:hover { color: var(--clay-dim); }

/* ---- Utility ---- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}

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

/* ---- Motion primitives ---- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1), transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.mask-line { overflow: hidden; }
.mask-line span {
  display: block;
  transform: translateY(105%);
  transition: transform 0.85s cubic-bezier(0.22, 1, 0.36, 1);
}
.mask-line.is-loaded span,
.mask-line.is-visible span { transform: translateY(0); }

.site-nav {
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), background 0.3s ease;
}
.site-nav.nav-hidden { transform: translateY(-100%); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .mask-line span { transform: none; }
}