/* --- Design tokens (from Figma: responsiveness-research / portfolio-site) --- */
:root {
  --bg: #232107;
  --tile: #2b2a1a;
  --card-bg: #0e0e05;
  --white: #ffffff;
  --cream: #fef9f1;
  --muted: rgba(255, 255, 255, 0.6);
  --label: #cccccc;
  --yellow: #ffeb00;
  --purple: #8f2099;
  --font-head: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --container: 1200px;
  --gutter: 24px;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--yellow); outline-offset: 4px; border-radius: 2px; }

.container { width: 100%; max-width: calc(var(--container) + var(--gutter) * 2); margin: 0 auto; padding: 0 var(--gutter); }

/* --- Shader background --- */
.shader-bg {
  position: absolute; z-index: 0; pointer-events: none;
  top: -80px; left: 0; width: 100%; height: 715px;   /* Figma: 628 overlay + 145 fade, offset -80 */
}
.shader-bg.no-webgl {                                 /* fallback when WebGL is unavailable */
  background: linear-gradient(180deg, #060645 0%, #202099 40%, #8f2099 62%, var(--bg) 92%);
}
.page { position: relative; z-index: 1; }

/* --- Progressive reveal (only hidden once JS is confirmed running) --- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(6px);
  transition: opacity .9s cubic-bezier(.2, .7, .2, 1), transform .9s cubic-bezier(.2, .7, .2, 1), filter .9s ease;
  transition-delay: var(--reveal-delay, 0ms);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; filter: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1; transform: none; filter: none; transition: none; }
}

/* --- Brand: mark + "subhrajit.[rotating word]" --- */
.brand { display: flex; align-items: center; gap: 20px; }
.brand__mark { width: 36px; height: auto; flex-shrink: 0; }
.brand__text {
  display: flex; align-items: baseline; white-space: nowrap;
  font-family: var(--font-head); font-weight: 700; line-height: 1.2;
  font-size: clamp(22px, 6.2vw, 48px);
}
.brand__dot { color: var(--yellow); }

.rotator {
  position: relative; display: inline-block; overflow: hidden;
  height: 1.2em; vertical-align: bottom;
  transition: width .5s cubic-bezier(.65, 0, .35, 1);
}
.rotator__word {
  position: absolute; left: 0; top: 0; color: var(--muted);
  transform: translateY(105%); opacity: 0;
  transition: transform .55s cubic-bezier(.65, 0, .35, 1), opacity .4s ease;
}
.rotator__word.is-active { position: relative; transform: none; opacity: 1; }
.rotator__word.is-leaving { transform: translateY(-105%); opacity: 0; }

/* --- Section title ("previously worked with", "recent works") --- */
.section-title { font-family: var(--font-head); font-weight: 400; font-size: 24px; line-height: 1.2; color: var(--yellow); }

/* --- Footer --- */
.footer { padding: 0 0 64px; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; color: var(--cream); }
.footer__social { display: flex; align-items: center; gap: 16px; }
.footer__social a { display: flex; transition: opacity .2s; }
.footer__social a:hover { opacity: .7; }
.footer__social img { width: 24px; height: 24px; }

@media (max-width: 640px) {
  :root { --gutter: 20px; }
  .brand { gap: 12px; }
  .brand__mark { width: 26px; }
  .footer { padding-bottom: 40px; }
}