/* =========================================================
   Spandan Banerjee — portfolio
   Shared design system. Warm light, Fraunces, calm.
   ========================================================= */

:root {
  --paper:      #FAF3E8;
  --paper-deep: #F3E7D3;
  --glow-core:  #FDE7BC;
  --glow-warm:  #F7CE94;
  --ink:        #33271B;
  --ink-mid:    #5A4A3A;
  --ink-soft:   #7A6650;
  --hairline:   rgba(51, 39, 27, 0.14);
  --hairline-2: rgba(51, 39, 27, 0.08);

  --measure: 40rem;          /* reading width for prose */
  --page:    72rem;          /* max page width */
  --gutter:  clamp(1.5rem, 5vw, 5rem);

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
}

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

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: var(--serif);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---------- Ambient light + grain (the signature) ---------- */
.light {
  position: fixed;
  inset: -25% 0 auto 0;
  height: 90vh;
  z-index: 0;
  background:
    radial-gradient(55% 60% at 78% 18%, var(--glow-core) 0%, rgba(253,231,188,0) 60%),
    radial-gradient(80% 75% at 88% 8%, var(--glow-warm) 0%, rgba(247,206,148,0) 68%);
  filter: blur(8px);
  pointer-events: none;
  animation: drift 18s ease-in-out infinite;
}
.vignette {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: radial-gradient(125% 105% at 70% 0%, rgba(243,231,211,0) 55%, var(--paper-deep) 100%);
  pointer-events: none;
}
.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.45;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@keyframes drift {
  0%, 100% { transform: translate(0, 0) scale(1);        opacity: 0.9; }
  50%      { transform: translate(-2%, 1.5%) scale(1.05); opacity: 1;  }
}

/* ---------- Layout scaffold ---------- */
.page {
  position: relative;
  z-index: 2;
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1 0 auto; }

/* ---------- Nav ---------- */
.nav {
  position: relative;
  z-index: 2;
  max-width: var(--page);
  margin: 0 auto;
  padding: clamp(1.5rem, 3.5vh, 2.5rem) var(--gutter);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}
.nav__mark {
  font-size: 1.05rem;
  font-weight: 460;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.nav__mark span { color: var(--ink-soft); font-style: italic; font-weight: 380; }
.nav__links {
  display: flex;
  gap: clamp(1.1rem, 3vw, 2rem);
  align-items: baseline;
}
.nav__links a {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.3s ease, border-color 0.3s ease;
}
.nav__links a:hover,
.nav__links a:focus-visible { color: var(--ink); border-color: var(--ink); }
.nav__links a.is-active { color: var(--ink); border-color: var(--hairline); }

/* ---------- Footer ---------- */
.foot {
  flex-shrink: 0;
  max-width: var(--page);
  margin: clamp(4rem, 12vh, 9rem) auto 0;
  padding: clamp(2rem, 4vh, 3rem) var(--gutter) clamp(2rem, 5vh, 3.5rem);
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.foot a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--hairline); padding-bottom: 1px; transition: color 0.3s ease, border-color 0.3s ease; }
.foot a:hover, .foot a:focus-visible { color: var(--ink); border-color: var(--ink); }

/* ---------- Shared type helpers ---------- */
.eyebrow {
  font-size: clamp(0.72rem, 1.4vw, 0.82rem);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 480;
}

.lede {
  max-width: var(--measure);
  font-size: clamp(1.1rem, 2.1vw, 1.35rem);
  line-height: 1.62;
  color: var(--ink-mid);
  font-weight: 360;
}
.lede em { color: var(--ink); font-style: italic; }

/* ---------- Hero (home) ---------- */
.hero { padding: clamp(3rem, 9vh, 7rem) 0 clamp(2.5rem, 7vh, 5rem); }
.hero__eyebrow { margin-bottom: clamp(1.6rem, 4vh, 2.4rem); }
.hero__statement {
  font-weight: 300;
  font-size: clamp(2rem, 6.2vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.018em;
  max-width: 20ch;
  margin-bottom: clamp(1.8rem, 4vh, 2.6rem);
}
.hero__statement em { font-style: italic; font-weight: 320; color: var(--ink-mid); }
.hero__current {
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  font-style: italic;
}

/* ---------- Work index (home) ---------- */
.work { padding-top: clamp(1rem, 3vh, 2rem); }
.work__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--hairline);
}
.work__head .eyebrow { color: var(--ink-mid); }
.work__count { font-size: 0.82rem; letter-spacing: 0.16em; color: var(--ink-soft); }

.proj {
  display: block;
  text-decoration: none;
  color: inherit;
  margin-bottom: clamp(3rem, 8vh, 6rem);
}
.proj:last-child { margin-bottom: 0; }
.proj__figure {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  border: 1px solid var(--hairline);
  background:
    linear-gradient(135deg, rgba(253,231,188,0.55), rgba(243,231,211,0.55)),
    var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 24px 50px -34px rgba(51,39,27,0.45);
  transition: transform 0.5s cubic-bezier(0.2,0.8,0.2,1), box-shadow 0.5s ease;
}
.proj:hover .proj__figure {
  transform: translateY(-5px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 36px 64px -34px rgba(51,39,27,0.5);
}
.proj__arrow {
  position: absolute;
  top: 1.1rem;
  right: 1.35rem;
  font-size: 1.3rem;
  color: var(--ink-soft);
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.proj:hover .proj__arrow { opacity: 1; transform: translate(0, 0); }
.proj__impact {
  margin-top: clamp(1.3rem, 3vh, 2rem);
  font-size: clamp(1.3rem, 3vw, 2.05rem);
  font-weight: 330;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 32ch;
}
.proj__tags {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.proj:focus-visible { outline: 2px solid var(--ink); outline-offset: 6px; border-radius: 10px; }

/* ---------- Case study ---------- */
.cs-hero { padding: clamp(2.5rem, 7vh, 5rem) 0 clamp(2rem, 5vh, 3.5rem); }
.cs-hero__eyebrow { margin-bottom: clamp(1.4rem, 3.5vh, 2rem); }
.cs-title {
  font-weight: 300;
  font-size: clamp(2.4rem, 8vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-bottom: clamp(1.2rem, 3vh, 1.8rem);
}
.cs-sub {
  max-width: var(--measure);
  font-size: clamp(1.15rem, 2.3vw, 1.5rem);
  line-height: 1.5;
  color: var(--ink-mid);
  font-style: italic;
  font-weight: 340;
}

.cs-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 1.5rem 2rem;
  padding: clamp(2rem, 5vh, 3rem) 0;
  margin-top: clamp(1.5rem, 4vh, 2.5rem);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.cs-meta dt {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
}
.cs-meta dd { font-size: 1.02rem; color: var(--ink); font-weight: 380; }

.cs-body { padding-top: clamp(2.5rem, 7vh, 5rem); }
.cs-section { padding-bottom: clamp(2.5rem, 7vh, 4.5rem); }
.cs-section__label {
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}
.cs-section h2 {
  font-weight: 320;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  max-width: 24ch;
  margin-bottom: 1.4rem;
}
.cs-section p {
  max-width: var(--measure);
  font-size: clamp(1.05rem, 1.9vw, 1.18rem);
  line-height: 1.66;
  color: var(--ink-mid);
  font-weight: 350;
  margin-bottom: 1.1rem;
}
.cs-section p:last-child { margin-bottom: 0; }
.cs-section p em { color: var(--ink); font-style: italic; }

/* figure placeholder — a product screen goes here */
.figure {
  margin: clamp(2rem, 5vh, 3rem) 0 0.75rem;
  border-radius: 14px;
  border: 1px solid var(--hairline);
  background:
    linear-gradient(135deg, rgba(253,231,188,0.5), rgba(243,231,211,0.5)),
    var(--paper);
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 20px 40px -30px rgba(51,39,27,0.4);
}
.figure--tall { aspect-ratio: 4 / 5; }
.figure__label {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-style: italic;
}
.figure-caption {
  font-size: 0.85rem;
  color: var(--ink-soft);
  font-style: italic;
  max-width: var(--measure);
}
.figure-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1rem, 2.5vw, 1.5rem);
  margin-top: clamp(2rem, 5vh, 3rem);
}
.figure-row .figure { margin-top: 0; }

/* prev / next */
.cs-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: clamp(2rem, 5vh, 3rem);
  border-top: 1px solid var(--hairline);
}
.cs-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.3s ease;
}
.cs-nav a:hover, .cs-nav a:focus-visible { color: var(--ink); }
.cs-nav .lbl { display: block; font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 0.4rem; }
.cs-nav .ttl { font-size: clamp(1.1rem, 2.4vw, 1.5rem); font-weight: 340; color: var(--ink); }
.cs-nav .next { text-align: right; }

/* ---------- Contact ---------- */
.contact { padding: clamp(2.5rem, 8vh, 6rem) 0 0; }
.contact__title {
  font-weight: 300;
  font-size: clamp(2.6rem, 9vw, 6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: clamp(1.4rem, 3.5vh, 2rem);
}
.contact__title em { font-style: italic; color: var(--ink-mid); font-weight: 320; }

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  padding-top: clamp(2.5rem, 6vh, 4rem);
  margin-top: clamp(2rem, 5vh, 3.5rem);
  border-top: 1px solid var(--hairline);
}
.contact__block h2 {
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 480;
  margin-bottom: 1.4rem;
}
.contact__link {
  display: block;
  font-size: clamp(1.2rem, 2.6vw, 1.7rem);
  font-weight: 330;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  margin-bottom: 0.7rem;
  width: fit-content;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}
.contact__link:hover, .contact__link:focus-visible { border-color: var(--ink); }
.contact__link .at { color: var(--ink-soft); font-style: italic; }

.contact__note { font-size: 0.95rem; color: var(--ink-soft); font-style: italic; margin-top: 0.4rem; }

/* résumé / experience list */
.exp { list-style: none; }
.exp li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--hairline-2);
  font-size: 1rem;
}
.exp li:last-child { border-bottom: 0; }
.exp .role { color: var(--ink); font-weight: 380; }
.exp .role span { display: block; color: var(--ink-soft); font-style: italic; font-weight: 340; font-size: 0.9rem; margin-top: 0.15rem; }
.exp .yr { color: var(--ink-soft); font-size: 0.82rem; letter-spacing: 0.08em; white-space: nowrap; font-variant-numeric: tabular-nums; padding-top: 0.15rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.6rem;
  padding: 0.85rem 1.5rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background 0.3s ease, color 0.3s ease;
}
.btn:hover, .btn:focus-visible { background: var(--ink); color: var(--paper); }

/* ---------- Entrance motion ---------- */
.reveal { opacity: 0; transform: translateY(16px); animation: rise 0.9s cubic-bezier(0.2,0.8,0.2,1) forwards; }
.reveal.d1 { animation-delay: 0.08s; }
.reveal.d2 { animation-delay: 0.18s; }
.reveal.d3 { animation-delay: 0.28s; }
.reveal.d4 { animation-delay: 0.38s; }
.reveal.d5 { animation-delay: 0.48s; }

@keyframes rise {
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .contact__grid { grid-template-columns: 1fr; gap: 3rem; }
  .figure-row { grid-template-columns: 1fr; }
  .cs-nav .next { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .light { animation: none; }
  .reveal { opacity: 1; transform: none; animation: none; }
  .proj__figure, .proj__arrow { transition: none; }
}