/* ============================================================
   Aryaman Saraogi — portfolio
   Committed dark theme. Vanilla CSS, no build step.
   ============================================================ */

:root {
  --bg:        #0a0a0b;
  --bg-elev:   #121216;
  --bg-elev-2: #17171c;
  --border:    #26262d;
  --border-2:  #33333c;

  --text:      #ededf0;
  --text-dim:  #a6a6b0;
  --text-mute: #74747f;

  --accent:      #ff5c35;
  --accent-2:    #ffd7cb;
  --accent-soft: rgba(255, 92, 53, 0.12);
  --accent-line: rgba(255, 92, 53, 0.35);

  --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-body:    'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Consolas', ui-monospace, monospace;

  --maxw: 1120px;
  --pad: clamp(1.25rem, 5vw, 3rem);
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  position: relative;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

/* subtle background grid + glow — anchored to the top of the page,
   absolute (not fixed) so it never trips up scroll compositing */
body::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1500px;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 88% -8%, rgba(255,92,53,0.12), transparent 62%),
    radial-gradient(700px 500px at -5% 18%, rgba(90,120,255,0.06), transparent 60%);
  pointer-events: none;
}
body::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1200px;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.12;
  mask-image: linear-gradient(#000 10%, transparent 92%);
  -webkit-mask-image: linear-gradient(#000 10%, transparent 92%);
  pointer-events: none;
}

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

.wrap {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
  width: 100%;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #12070b;
  padding: 0.6rem 1rem;
  font-weight: 600;
  z-index: 999;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(10,10,11,0.55);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease;
}
.site-header.is-scrolled {
  background: rgba(10,10,11,0.9);
  border-bottom-color: var(--border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand__mark { width: 26px; height: 26px; color: var(--accent); }
.brand__name { font-size: 0.98rem; }

.site-nav { display: flex; gap: 1.9rem; }
.site-nav a {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 500;
  position: relative;
  padding: 0.35rem 0;
  transition: color .18s ease;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s ease;
}
.site-nav a:hover { color: var(--text); }
.site-nav a:hover::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  background: none;
  border: 1px solid var(--border-2);
  border-radius: 10px;
  cursor: pointer;
  padding: 11px 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease;
}
.nav-toggle span + span { margin-top: 4px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 0.5rem var(--pad) 1.25rem;
  border-bottom: 1px solid var(--border);
  background: rgba(10,10,11,0.97);
}
.mobile-nav a {
  padding: 0.85rem 0;
  color: var(--text-dim);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}
.mobile-nav a:last-child { border-bottom: none; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.72rem 1.15rem;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  color: var(--text);
  background: var(--bg-elev);
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}
.btn:hover { border-color: var(--text-mute); transform: translateY(-2px); }
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a0a04;
  font-weight: 600;
}
.btn--primary:hover { background: #ff714f; border-color: #ff714f; }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding-top: clamp(3.5rem, 9vw, 7rem);
  padding-bottom: clamp(3.5rem, 9vw, 6.5rem);
}
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.4rem;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.3rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.hero__title .accent { color: var(--accent); }
.hero__lead {
  margin-top: 1.6rem;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  color: var(--text-dim);
  max-width: 46ch;
}
.hero__actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}
.hero__stats {
  margin-top: 2.6rem;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  border-top: 1px solid var(--border);
  padding-top: 1.6rem;
}
.hero__stats strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}
.hero__stats span {
  font-size: 0.8rem;
  color: var(--text-mute);
}

.hero__portrait {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border-2);
  aspect-ratio: 1 / 1;
  background:
    linear-gradient(135deg, #1c1c22, #0e0e12);
}
.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.15) contrast(1.03);
}
.hero__portrait::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  box-shadow: inset 0 0 90px rgba(0,0,0,0.55);
  pointer-events: none;
}
.hero__portrait.no-img img { display: none; }
.hero__portrait.no-img::after {
  content: attr(data-initials);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

/* ---------- about ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  align-items: center;
  margin-bottom: clamp(2.5rem, 6vw, 3.75rem);
}
.about__portrait {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-2);
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, #1c1c22, #0e0e12);
  position: relative;
}
.about__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}
.about__portrait.no-img img { display: none; }
.about__portrait.no-img::after {
  content: attr(data-initials);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.about__text .section__title { margin-bottom: 1rem; }
.about__text p { color: var(--text-dim); margin-bottom: 0.9rem; max-width: 52ch; }
.about__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

/* ---------- lab strip ---------- */
.lab-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.lab-strip__item {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-elev);
}
.lab-strip__item img {
  width: 100%;
  height: clamp(240px, 36vw, 400px);
  object-fit: cover;
  object-position: center 22%;
  filter: grayscale(0.1);
}
.lab-strip__item figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-mute);
  padding: 0.7rem 0.95rem;
  border-top: 1px solid var(--border);
}

/* ---------- sections ---------- */
.section {
  padding-block: clamp(4rem, 10vw, 7rem);
  border-top: 1px solid var(--border);
}
.section--alt { background: linear-gradient(180deg, var(--bg-elev) 0%, var(--bg) 100%); }

.section__head { max-width: 62ch; margin-bottom: clamp(2.5rem, 6vw, 4rem); }
.section__index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}
.section__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.section__sub {
  margin-top: 1rem;
  color: var(--text-dim);
  font-size: 1.02rem;
}

/* ---------- group titles ---------- */
.group-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 2.5vw, 1.45rem);
  letter-spacing: -0.01em;
  color: var(--text);
  margin: clamp(2.5rem, 6vw, 4rem) 0 2rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.9rem;
}
.group-title:first-of-type { margin-top: 0; }
.group-title__num {
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  border-radius: 8px;
  background: var(--accent-soft);
}

/* ---------- project ---------- */
.project {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.25rem);
  align-items: start;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: 1.5rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.project--reverse .project__media { order: 2; }
.project--compact { grid-template-columns: 1fr; max-width: 760px; }

.project__media {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-2);
  background: #000;
  align-self: start;
}
.project__media video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: contain;   /* show the whole frame, never crop */
  background: #000;
}
.project__media--portrait {
  align-self: center;
  max-width: 340px;
  margin-inline: auto;
  width: 100%;
}
.project__media--portrait video {
  aspect-ratio: 9 / 16;
  object-fit: contain;
}

.project__body { align-self: center; }
.project__kicker {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 0.7rem;
}
.project__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-bottom: 0.9rem;
}
.project__lead {
  color: var(--text);
  font-size: 1.05rem;
  margin-bottom: 1rem;
}
.project__body p { color: var(--text-dim); margin-bottom: 0.9rem; }
.project__body p strong { color: var(--text); font-weight: 600; }
.project__note {
  font-size: 0.92rem;
  color: var(--text-dim);
  border-left: 2px solid var(--accent-line);
  padding-left: 0.9rem;
  margin-top: 1.1rem;
}

.steps {
  list-style: none;
  counter-reset: step;
  margin: 0 0 1.1rem;
  display: grid;
  gap: 0.75rem;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.1rem;
  color: var(--text-dim);
  font-size: 0.94rem;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0.05rem;
  width: 1.5rem; height: 1.5rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  border-radius: 6px;
}

.specs {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem 1rem;
  margin: 0 0 1.2rem;
  padding: 1rem 1.1rem;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.specs li { display: flex; flex-direction: column; gap: 0.1rem; }
.specs span { font-size: 0.72rem; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.03em; }
.specs strong { font-family: var(--font-mono); font-size: 0.9rem; font-weight: 500; color: var(--text); }

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.1rem;
}
.chips li {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  padding: 0.32rem 0.6rem;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  background: var(--bg-elev-2);
}

/* ---------- grids of cards ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.project-grid--three { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 3vw, 1.9rem);
  transition: border-color .2s ease, transform .2s ease;
}
.card:hover { border-color: var(--border-2); transform: translateY(-3px); }
.card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  line-height: 1.25;
  margin: 0.5rem 0 0.7rem;
  letter-spacing: -0.01em;
}
.card p { color: var(--text-dim); font-size: 0.94rem; }
.card--research { border-left: 2px solid var(--accent-line); }

/* ---------- timeline ---------- */
.timeline {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--border-2);
  margin-left: 0.5rem;
}
.tl-item {
  position: relative;
  padding: 0 0 2.2rem 1.9rem;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -5px; top: 0.4rem;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}
.tl-item__meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-mute);
  letter-spacing: 0.02em;
  margin-bottom: 0.35rem;
}
.tl-item__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.16rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}
.tl-item p { color: var(--text-dim); font-size: 0.95rem; }

/* ---------- contact ---------- */
.contact { text-align: center; }
.contact .section__head { margin-inline: auto; }
.contact__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
}
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-mute);
}

/* ---------- reveal animation ---------- */
/* only hide when JS is running, so a JS failure never hides content */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s ease, transform .5s ease;
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .site-nav { display: none; }
  .nav-toggle { display: block; }
  .mobile-nav.is-open { display: flex; }
  .lab-strip { grid-template-columns: 1fr; }
  .about__grid {
    grid-template-columns: 1fr;
    justify-items: start;
  }
  .about__portrait { max-width: 260px; }
  .hero {
    grid-template-columns: 1fr;
    padding-top: 2.5rem;
  }
  .hero__portrait {
    order: -1;
    max-width: 300px;
  }
  .project {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .project--reverse .project__media { order: -1; }
  .project__media--portrait { max-width: 300px; }
  .project-grid,
  .project-grid--three { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .hero__stats { gap: 1.1rem; }
  .specs { grid-template-columns: 1fr; }
  .steps li { padding-left: 1.9rem; }
}