/* ---------------------------------------------------------------
   StackMoth — landing page
   Dark charcoal foundation · warm amber light · warm off-white text
   --------------------------------------------------------------- */

:root {
  --bg: #131109;
  --bg-raised: #1a1710;
  --text: #f1ead9;
  --muted: #b3a891;
  --amber: #e6a53d;
  --amber-hi: #f4bc5e;
  --amber-dim: rgba(230, 165, 61, 0.14);
  --line: #2c2617;
  --line-strong: #453b22;

  --sans: "Avenir Next", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

  --space-section: clamp(4.5rem, 10vw, 8rem);
  --mx: 50%;
  --my: 18rem;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; }
a { color: var(--amber); text-decoration-color: rgba(230, 165, 61, 0.4); text-underline-offset: 0.18em; }
a:hover { color: var(--amber-hi); }

/* Pointer-responsive light (position set from JS on fine pointers) */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    34rem 34rem at var(--mx) var(--my),
    rgba(230, 165, 61, 0.055),
    transparent 72%
  );
  z-index: 0;
}
body > * { position: relative; z-index: 1; }

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  background: var(--amber);
  color: #171307;
  font-weight: 600;
  padding: 0.6rem 1rem;
  border-radius: 4px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 1rem; color: #171307; }

/* ---------- Layout ---------- */
.container {
  width: min(70rem, 100% - 3rem);
  margin-inline: auto;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(19, 17, 9, 0.92);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-block: 0.85rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  text-decoration: none;
}
.brand__word {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.01em;
}
.brand__mark { color: var(--amber); }
.site-nav {
  display: flex;
  gap: 1.4rem;
  margin-left: auto;
}
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.18s ease;
}
.site-nav a:hover { color: var(--amber-hi); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  padding: 0.85rem 1.6rem;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: transform 0.18s ease, background-color 0.18s ease,
              border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}
.btn--primary {
  background: var(--amber);
  color: #171307;
  box-shadow: 0 0 0 0 rgba(230, 165, 61, 0);
}
.btn--primary:hover {
  background: var(--amber-hi);
  color: #171307;
  transform: translateY(-1px);
  box-shadow: 0 6px 22px -8px rgba(230, 165, 61, 0.45);
}
.btn--ghost {
  border-color: var(--line-strong);
  color: var(--text);
  background: transparent;
}
.btn--ghost:hover {
  border-color: var(--amber);
  color: var(--amber-hi);
  transform: translateY(-1px);
}
.btn--small { padding: 0.5rem 1rem; font-size: 0.9375rem; }
.btn:active { transform: translateY(0); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4rem, 9vw, 7.5rem) clamp(4.5rem, 9vw, 7rem);
}
/* faint stack-grid, fading out toward the edges */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(230, 165, 61, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 165, 61, 0.05) 1px, transparent 1px);
  background-size: 4.5rem 4.5rem;
  -webkit-mask-image: radial-gradient(75% 70% at 50% 32%, #000 30%, transparent 78%);
  mask-image: radial-gradient(75% 70% at 50% 32%, #000 30%, transparent 78%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
}
.hero__inner > * { min-width: 0; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 1.1rem;
}
h1 {
  font-size: clamp(2.5rem, 5.6vw, 4.35rem);
  line-height: 1.06;
  letter-spacing: -0.022em;
  font-weight: 700;
  max-width: 14ch;
}
.lede {
  margin-top: 1.4rem;
  max-width: 36rem;
  font-size: clamp(1.0625rem, 1.6vw, 1.2rem);
  color: var(--muted);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2.2rem;
}

/* Hero visual: moth above a stack of layers */
.hero__visual {
  display: flex;
  justify-content: center;
}
.hero__moth {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.6rem;
  padding: 2.5rem 2rem;
}
.hero__moth::before {
  content: "";
  position: absolute;
  inset: -12%;
  background: radial-gradient(closest-side, rgba(230, 165, 61, 0.13), transparent 72%);
  pointer-events: none;
}
.moth {
  width: clamp(9rem, 16vw, 12.5rem);
  height: auto;
  position: relative;
}
.moth path {
  fill: none;
  stroke: var(--amber);
  stroke-width: 2.4;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.moth .moth__detail { stroke-width: 1.6; opacity: 0.75; }
.moth .moth__body path:nth-child(3),
.moth .moth__body path:nth-child(4) { fill: var(--amber); stroke: none; }
.moth__wing { transform-box: fill-box; animation: wing-breathe 7s ease-in-out infinite; }
.moth__wing--left { transform-origin: 100% 45%; }
.moth__wing--right { transform-origin: 0% 45%; }
@keyframes wing-breathe {
  0%, 100% { transform: scaleX(1); }
  50% { transform: scaleX(0.93); }
}
.hero__stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
}
.hero__stack span {
  display: block;
  height: 0.45rem;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}
.hero__stack span:nth-child(1) { width: 5.5rem; }
.hero__stack span:nth-child(2) { width: 7.5rem; border-color: rgba(230, 165, 61, 0.35); }
.hero__stack span:nth-child(3) { width: 9.5rem; }

/* ---------- Sections ---------- */
.section {
  padding-block: var(--space-section);
  border-top: 1px solid var(--line);
}
h2 {
  font-size: clamp(1.85rem, 3.4vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.018em;
  font-weight: 700;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  max-width: 22ch;
}
h3 {
  font-size: 1.1875rem;
  line-height: 1.3;
  letter-spacing: -0.008em;
}

/* Capabilities */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.8rem, 4vw, 3rem) clamp(2rem, 5vw, 4rem);
}
.cap {
  border-top: 1px solid var(--line-strong);
  padding-top: 1.2rem;
}
.cap h3 {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 0.55rem;
}
.cap__num {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--amber);
}
.cap p, .approach p { color: var(--muted); }

/* Work */
.work-list { border-bottom: 1px solid var(--line); }
.work {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem 2.5rem;
  align-items: start;
  padding-block: 1.8rem;
  border-top: 1px solid var(--line);
}
.work__main h3 { margin-bottom: 0.45rem; }
.work__main p { color: var(--muted); max-width: 44rem; }
.work__meta {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--amber);
  white-space: nowrap;
  padding-top: 0.2rem;
}
.section-note {
  margin-top: 1.8rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

/* Approach */
.approach-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.8rem, 4vw, 3rem) clamp(2rem, 5vw, 4rem);
}
.approach {
  border-top: 1px solid var(--line-strong);
  padding-top: 1.2rem;
}
.approach h3 { margin-bottom: 0.55rem; }

/* Contact */
.section--contact { background: var(--bg-raised); }
.contact-lede {
  max-width: 34rem;
  color: var(--muted);
  font-size: clamp(1.0625rem, 1.6vw, 1.2rem);
  margin-top: -1rem;
}
.section--contact h2 { margin-bottom: 1.4rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2.6rem;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem 2rem;
}
.site-footer__tag { color: var(--muted); font-size: 0.9375rem; }
.site-footer__links {
  display: flex;
  gap: 1.3rem;
  margin-left: auto;
}
.site-footer__links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.18s ease;
}
.site-footer__links a:hover { color: var(--amber-hi); }
.site-footer__fine {
  flex-basis: 100%;
  color: #7d7462;
  font-size: 0.8125rem;
  margin-top: 0.6rem;
}

/* ---------- 404 ---------- */
.notfound {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1.1rem;
  padding: 2rem;
}
.notfound svg { width: 6rem; height: auto; }
.notfound h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); max-width: none; }
.notfound p { color: var(--muted); max-width: 30rem; }

/* ---------- Scroll reveal (JS-gated; no-JS stays visible) ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 52rem) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .hero__moth { padding: 0.5rem 0 1rem; }
  .moth { width: 8rem; }
  .hero__stack span:nth-child(1) { width: 4rem; }
  .hero__stack span:nth-child(2) { width: 5.5rem; }
  .hero__stack span:nth-child(3) { width: 7rem; }
  h1 { max-width: 18ch; }
  .work { grid-template-columns: 1fr; gap: 0.5rem; }
  .work__meta { padding-top: 0; }
}
@media (max-width: 40rem) {
  .cap-grid, .approach-grid { grid-template-columns: 1fr; }
  .site-nav { display: none; }
  .site-header__cta { margin-left: auto; }
  .eyebrow { font-size: 0.75rem; letter-spacing: 0.11em; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html.js .reveal { opacity: 1; transform: none; }
}