/* ── Registered custom properties ── */
@property --heat {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}
@property --heat-x {
  syntax: '<number>';
  inherits: true;
  initial-value: 50;
}

/* ── Font ── */
@font-face {
  font-family: 'Inter';
  src: url('/fonts/InterVariable.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: block;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC,
    U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ── Design tokens ── */
:root {
  --canvas:     #F5F3EF;               /* off-white background */
  --pour:       #FF6A00;               /* Kwark orange */
  --type:       #111111;               /* primary text */
  --type-quiet: rgba(17, 17, 17, 0.48);
  --utility:    rgba(17, 17, 17, 0.42);

  --margin: clamp(1.5rem, 7vw, 8rem);
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--canvas);
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Page container ── */
.page {
  position: fixed;
  inset: 0;
  overflow: hidden;
  background: var(--canvas);
}

/* ── Heat field ──
   On a light background, multiply blend mode darkens toward warm orange
   rather than brightening (screen). Transparent gradient stops = white
   in multiply = no effect, so the canvas reads cold everywhere except
   the floor zone where orange multiplies in.

   Geometry identical to kwarkgroup.com:
     Bloom  — center 108% from top, 68% v-radius → transparent above ~60%
     Body   — center 108% from top, 45% v-radius → transparent above ~77%
     Core   — center 104% from top, 12% v-radius → bottom 8% only
*/
.heat {
  position: absolute;
  inset: 0;
  pointer-events: none;
  transform: translateY(14%);
  transition: transform 1200ms cubic-bezier(0.16, 1, 0.3, 1);
}

.heat.risen {
  transform: translateY(0);
}

.heat-floor,
.heat-bloom,
.heat-body,
.heat-core {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Warm base — no blend mode, just softens the transition to canvas */
.heat-floor {
  background: linear-gradient(
    to top,
    rgba(255, 140, 40, 0.07) 0%,
    transparent 33%
  );
}

/* Outer falloff — wide, very soft amber-orange */
.heat-bloom {
  background: radial-gradient(
    ellipse 130% 68% at calc(var(--heat-x) * 1%) 108%,
    rgba(200, 88, 18, calc(0.22 * var(--heat))) 0%,
    transparent 70%
  );
  filter: blur(110px);
  mix-blend-mode: multiply;
}

/* Body — Kwark orange */
.heat-body {
  background: radial-gradient(
    ellipse 95% 45% at calc(var(--heat-x) * 1%) 108%,
    rgba(255, 106, 0, calc(0.32 * var(--heat))) 0%,
    transparent 67%
  );
  filter: blur(55px);
  mix-blend-mode: multiply;
}

/* Core — deepest orange, hugging the floor */
.heat-core {
  background: radial-gradient(
    ellipse 80% 12% at calc(var(--heat-x) * 1%) 104%,
    rgba(255, 75, 0, calc(0.48 * var(--heat))) 0%,
    transparent 100%
  );
  filter: blur(24px);
  mix-blend-mode: multiply;
}

/* ── Wordmark ── */
.wordmark {
  position: absolute;
  top: clamp(1.5rem, 3.5vh, 2.5rem);
  left: var(--margin);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--type);
  line-height: 1;
  opacity: 0;
  transition: opacity 400ms ease;
  user-select: none;
}

/* ── Statement ── */
.statement {
  position: absolute;
  left: var(--margin);
  top: 48%;
  transform: translateY(-50%);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: clamp(1.6rem, 4.4vw, 3.75rem);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.12;
  font-style: normal;
}

.line {
  display: block;
}

.sentence {
  display: block;
}

.sentence--setup {
  color: var(--type-quiet);
  opacity: 0;
  transition: opacity 500ms ease;
}

.sentence--claim {
  color: var(--type);
  opacity: 0;
  transition: opacity 550ms ease;
}

/* ── Footer ── */
footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0 var(--margin) clamp(1.5rem, 3.5vh, 2.5rem);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  opacity: 0;
  transition: opacity 400ms ease;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-left p,
.footer-link {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.footer-left p {
  color: var(--utility);
}

.footer-link {
  color: var(--utility);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(17, 17, 17, 0.18);
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

.footer-link:hover {
  color: var(--type);
  text-decoration-color: rgba(17, 17, 17, 0.5);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.social-link {
  display: flex;
  align-items: center;
  color: var(--utility);
  transition: color 160ms ease;
}

.social-link:hover {
  color: var(--type);
}

/* ── Focus styles ── */
:focus-visible {
  outline: 1px solid var(--pour);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ── Mobile: ≤640px ── */
@media (max-width: 640px) {
  .statement {
    font-size: clamp(1.35rem, 6.5vw, 1.9rem);
    line-height: 1.18;
    max-width: 28ch;
    right: var(--margin);
  }

  .line {
    display: inline;
  }

  .sentence {
    display: block;
    text-wrap: balance;
  }

  .sentence--claim {
    margin-top: 1.1em;
  }

  /* Reduce blur for mobile GPU headroom */
  .heat-bloom { filter: blur(65px); }
  .heat-body  { filter: blur(32px); }
  .heat-core  { filter: blur(14px); }
}

/* ── Very narrow: ≤400px ── */
@media (max-width: 400px) {
  :root {
    --margin: 1.25rem;
  }
}

/* ── Reduced motion: settled poster ── */
@media (prefers-reduced-motion: reduce) {
  .heat {
    transform: translateY(0) !important;
    transition: none !important;
  }

  .wordmark,
  .sentence--setup,
  .sentence--claim,
  footer {
    opacity: 1 !important;
    transition: none !important;
  }
}