/* ============================================================
   Vasu Rajat Kumar — portfolio
   Design language inspired by Cohere (Pentagram, 2023):
   alabaster base, warm-black ink, coral accent (#FF7759),
   Space Grotesk headlines + Space Mono labels, generous spacing,
   a small "cell" tag motif.
============================================================ */

:root {
  --bg:        #f9f8f4;   /* warm alabaster */
  --surface:   #ffffff;
  --card:      #ffffff;
  --ink:       #1c1a17;   /* warm near-black, not pure */
  --ink-2:     #565049;
  --ink-3:     #8b857b;
  --line:      rgba(28,26,23,0.10);
  --line-2:    rgba(28,26,23,0.16);

  --clay:      #ff7759;   /* Cohere "Bittersweet" coral — large accents/fills */
  --clay-deep: #d9532f;   /* deeper coral — small text, links, eyebrows */
  --clay-tint: rgba(255,119,89,0.12);

  --display: 'Space Grotesk', system-ui, sans-serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono: 'Space Mono', ui-monospace, 'SFMono-Regular', monospace;

  --maxw: 1200px;
  --pad: 48px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
::selection { background: var(--clay); color: #fff; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ---------- type primitives ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px; font-weight: 400;
  letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--clay-deep);
  display: inline-flex; align-items: center;
}
.eyebrow::before {                       /* the "cell" tag motif */
  content: ''; width: 8px; height: 8px; border-radius: 2px;
  background: var(--clay); margin-right: 10px; flex: none;
}
.display { font-family: var(--display); font-weight: 500; line-height: 1.04; letter-spacing: -0.02em; }
.clay { color: var(--clay-deep); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); position: relative; z-index: 2; }
section { position: relative; z-index: 2; }

/* ============================================================ NAV */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--pad);
  background: rgba(249,248,244,0.78);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent; transition: border-color .3s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-name { font-family: var(--display); font-weight: 600; font-size: 19px; letter-spacing: -0.01em; }
.nav-name .dot { color: var(--clay); }
.nav-right { display: flex; align-items: center; gap: 28px; }
.nav-link { font-family: var(--mono); font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-2); transition: color .2s; }
.nav-link:hover { color: var(--clay-deep); }
.nav-cta {
  font-family: var(--mono); font-size: 13px; text-transform: uppercase; letter-spacing: 0.02em;
  padding: 10px 18px; border-radius: 8px; background: var(--ink); color: #fff; transition: background .25s, transform .2s;
}
.nav-cta:hover { background: var(--clay); color: var(--ink); transform: translateY(-1px); }
@media (max-width: 640px){ .nav-links-hide { display: none; } }

/* ============================================================ HERO */
.hero { padding: 180px 0 110px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 72px; align-items: center; }
.hero-eyebrow { margin-bottom: 30px; }
.hero-name {
  font-family: var(--display); font-weight: 600;
  font-size: clamp(52px, 8.4vw, 104px); line-height: 0.96; letter-spacing: -0.035em; margin-bottom: 34px;
}
.hero-name .ln2 { color: var(--clay); }
.hero-thesis {
  font-family: var(--display); font-weight: 400;
  font-size: clamp(21px, 2.5vw, 29px); line-height: 1.35; letter-spacing: -0.015em; color: var(--ink); max-width: 30ch; margin-bottom: 26px;
}
.hero-thesis em { font-style: normal; color: var(--clay-deep); }
.hero-sub { font-size: 17px; color: var(--ink-2); max-width: 48ch; margin-bottom: 44px; line-height: 1.7; }
.hero-meta { display: flex; gap: 48px; flex-wrap: wrap; }
.hero-meta .k { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 7px; }
.hero-meta .v { font-size: 17px; font-weight: 600; }
.hero-meta .v .n { font-family: var(--display); color: var(--clay-deep); font-size: 21px; }

.hero-photo { position: relative; }
.hero-photo img { width: 100%; aspect-ratio: 4/5; object-fit: cover; object-position: center 20%; border-radius: 14px; }
@media (max-width: 860px){
  .hero { padding: 132px 0 72px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-photo { order: -1; max-width: 320px; }
}

/* ============================================================ THE THREAD */
.thread { padding: 108px 0; border-top: 1px solid var(--line); }
.thread-head { max-width: 760px; margin-bottom: 64px; }
.thread-title { font-family: var(--display); font-weight: 600; font-size: clamp(32px, 4.8vw, 54px); line-height: 1.06; letter-spacing: -0.03em; margin-top: 22px; }
.thread-title em { font-style: normal; color: var(--clay); }

.thread-grid { display: grid; grid-template-columns: 0.92fr 1.08fr; gap: 64px; align-items: start; }
.thread-photo img { width: 100%; aspect-ratio: 3/4; object-fit: cover; object-position: center 30%; border-radius: 14px; }
.thread-photo .cap { font-family: var(--mono); font-size: 12px; color: var(--ink-3); margin-top: 14px; line-height: 1.5; }
.thread-body p { color: var(--ink-2); margin-bottom: 22px; font-size: 18px; }
.thread-body p strong { color: var(--ink); font-weight: 600; }

.strands { margin-top: 38px; }
.strand { padding: 26px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 150px 1fr; gap: 24px; }
.strand:last-child { border-bottom: 1px solid var(--line); }
.strand-name { font-family: var(--display); font-weight: 600; font-size: 21px; color: var(--clay-deep); letter-spacing: -0.01em; }
.strand-txt { color: var(--ink-2); font-size: 16.5px; }
@media (max-width: 860px){
  .thread { padding: 72px 0; }
  .thread-grid { grid-template-columns: 1fr; gap: 40px; }
  .thread-photo { max-width: 320px; }
  .strand { grid-template-columns: 1fr; gap: 6px; }
}

/* ============================================================ SELECTED WORK */
.work { padding: 108px 0 48px; border-top: 1px solid var(--line); }
.work-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 28px; margin-bottom: 26px; flex-wrap: wrap; }
.work-title { font-family: var(--display); font-weight: 600; font-size: clamp(30px,4.4vw,50px); letter-spacing: -0.03em; margin-top: 14px; }
.work-intro { max-width: 44ch; color: var(--ink-2); font-size: 16px; }

.case-row {
  display: grid; grid-template-columns: 64px 1fr auto; gap: 30px; align-items: center;
  padding: 34px 6px; border-top: 1px solid var(--line);
  transition: padding-left .3s ease, background .3s ease; cursor: pointer;
}
.case-row:last-of-type { border-bottom: 1px solid var(--line); }
.case-row:hover { padding-left: 18px; background: linear-gradient(90deg, var(--clay-tint), transparent 60%); }
.case-row:hover .case-name { color: var(--clay-deep); }
.case-row:hover .case-arrow { transform: translate(4px,-4px); color: var(--clay-deep); }
.case-idx { font-family: var(--mono); font-size: 14px; color: var(--ink-3); }
.case-room { font-family: var(--mono); font-size: 12px; letter-spacing: 0.02em; text-transform: uppercase; color: var(--clay-deep); margin-bottom: 9px; }
.case-name { font-family: var(--display); font-weight: 600; font-size: clamp(23px,2.7vw,31px); letter-spacing: -0.025em; line-height: 1.1; transition: color .25s; }
.case-name .sub { color: var(--ink-3); font-weight: 400; }
.case-desc { color: var(--ink-2); font-size: 15.5px; margin-top: 9px; max-width: 60ch; }
.case-tags { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.tag { font-family: var(--mono); font-size: 11px; letter-spacing: 0.02em; text-transform: uppercase; padding: 5px 11px; border-radius: 6px; border: 1px solid var(--line-2); color: var(--ink-3); }
.tag.strand-tag { color: var(--clay-deep); border-color: var(--clay-tint); background: var(--clay-tint); }
.case-meta-r { text-align: right; min-width: 140px; }
.case-metric { font-family: var(--display); font-weight: 600; font-size: 23px; color: var(--ink); line-height: 1.1; letter-spacing: -0.02em; }
.case-metric-l { font-family: var(--mono); font-size: 11px; color: var(--ink-3); margin-top: 5px; text-transform: uppercase; letter-spacing: 0.02em; }
.case-arrow { font-size: 21px; color: var(--ink-3); transition: transform .25s, color .25s; margin-top: 12px; display: inline-block; }
@media (max-width: 760px){
  .work { padding: 72px 0 40px; }
  .case-row { grid-template-columns: 1fr; gap: 6px; }
  .case-idx { display: none; }
  .case-meta-r { text-align: left; margin-top: 12px; display: flex; align-items: baseline; gap: 10px; }
  .case-metric-l { margin-top: 0; }
  .case-arrow { display: none; }
}

/* ============================================================ EXPERIENCE */
.exp { padding: 108px 0; border-top: 1px solid var(--line); }
.exp-grid { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 64px; }
.exp-title { font-family: var(--display); font-weight: 600; font-size: clamp(30px,4.4vw,50px); letter-spacing: -0.03em; margin-top: 14px; }
.exp-note { color: var(--ink-2); margin-top: 20px; font-size: 16.5px; max-width: 34ch; }
.exp-dl { font-family: var(--mono); display: inline-flex; align-items: center; gap: 8px; margin-top: 28px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.02em; color: var(--clay-deep); border-bottom: 1px solid var(--clay-tint); padding-bottom: 4px; }
.exp-dl:hover { border-bottom-color: var(--clay); }
.exp-row { display: grid; grid-template-columns: 100px 1fr auto; gap: 22px; padding: 22px 0; border-top: 1px solid var(--line); align-items: center; }
.exp-row:last-child { border-bottom: 1px solid var(--line); }
.exp-logo-cell { display: flex; align-items: center; }
.exp-logo { height: 25px; max-width: 88px; width: auto; object-fit: contain; object-position: left center; opacity: 0.68; transition: opacity .25s; }
.exp-row:hover .exp-logo { opacity: 1; }
.exp-logo-text { font-family: var(--display); font-weight: 600; font-size: 17px; color: var(--ink); opacity: 0.55; }
.exp-org { font-family: var(--display); font-weight: 600; font-size: 19px; letter-spacing: -0.01em; }
.exp-role { color: var(--ink-2); font-size: 15.5px; margin-top: 3px; }
.exp-when { font-family: var(--mono); color: var(--ink-3); font-size: 12.5px; white-space: nowrap; text-align: right; padding-top: 4px; }
@media (max-width: 860px){ .exp { padding: 72px 0; } .exp-grid { grid-template-columns: 1fr; gap: 38px; } }
@media (max-width: 560px){
  .exp-row { grid-template-columns: 56px 1fr; gap: 14px; }
  .exp-logo { height: 20px; max-width: 52px; }
  .exp-when { grid-column: 2; text-align: left; padding-top: 2px; }
}

/* ============================================================ CONTACT (dark block) */
.contact { padding: 120px 0; background: var(--ink); color: var(--bg); position: relative; overflow: hidden; }
.contact::after {                                  /* faint coral cell glow */
  content: ''; position: absolute; right: -10%; top: -30%; width: 50%; height: 160%;
  background: radial-gradient(circle, rgba(255,119,89,0.18), transparent 60%); pointer-events: none;
}
.contact-title { font-family: var(--display); font-weight: 600; font-size: clamp(36px,6.2vw,74px); letter-spacing: -0.035em; line-height: 1.0; max-width: 18ch; }
.contact-title em { font-style: normal; color: var(--clay); }
.contact .eyebrow { color: var(--clay); margin-bottom: 24px; }
.contact-rows { margin-top: 50px; max-width: 640px; }
.contact-row { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; border-top: 1px solid rgba(255,255,255,0.14); transition: padding-left .25s; }
.contact-row:last-child { border-bottom: 1px solid rgba(255,255,255,0.14); }
.contact-row:hover { padding-left: 12px; }
.contact-row:hover .contact-v { color: var(--clay); }
.contact-k { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase; color: rgba(249,248,244,0.55); }
.contact-v { font-size: 17px; font-weight: 500; transition: color .2s; }

.footer { padding: 32px 0 52px; border-top: 1px solid var(--line); display: flex; }
.footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; width: 100%; }
.footer, .footer a { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.02em; color: var(--ink-3); }
.footer a:hover { color: var(--clay-deep); }

/* ============================================================ CASE STUDY PAGE */
.cs-hero { padding: 150px 0 54px; }
.cs-back { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--ink-3); display: inline-flex; gap: 8px; margin-bottom: 46px; transition: color .2s, gap .2s; }
.cs-back:hover { color: var(--clay-deep); gap: 12px; }
.cs-room { margin-bottom: 22px; }
.cs-title { font-family: var(--display); font-weight: 600; font-size: clamp(36px, 6vw, 70px); line-height: 1.02; letter-spacing: -0.035em; max-width: 18ch; }
.cs-title em { font-style: normal; color: var(--clay); }
.cs-lede { font-family: var(--display); font-weight: 400; font-size: clamp(19px,2.3vw,26px); line-height: 1.4; color: var(--ink-2); max-width: 42ch; margin-top: 28px; letter-spacing: -0.01em; }

.cs-meta { display: flex; gap: 48px; flex-wrap: wrap; margin-top: 46px; padding: 28px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cs-meta .k { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 7px; }
.cs-meta .v { font-size: 16px; font-weight: 600; }

.cs-figure { margin: 60px 0; }
.cs-figure img { width: 100%; border-radius: 14px; border: 1px solid var(--line); }
.cs-figure .cap { font-family: var(--mono); font-size: 12px; color: var(--ink-3); margin-top: 14px; }

.cs-body { max-width: 680px; margin: 60px auto 0; }
.cs-body p { font-size: 19px; line-height: 1.75; color: var(--ink-2); margin-bottom: 28px; }
.cs-body p strong { color: var(--ink); font-weight: 600; }

.cs-pull { max-width: 780px; margin: 64px auto; padding: 8px 0 8px 32px; border-left: 3px solid var(--clay); }
.cs-pull p { font-family: var(--display); font-weight: 500; font-size: clamp(23px,3vw,32px); line-height: 1.3; letter-spacing: -0.025em; color: var(--ink); }

.cs-outcome { max-width: 680px; margin: 0 auto; display: grid; grid-template-columns: repeat(3,1fr); gap: 32px; padding: 36px 0; }
.cs-outcome .num { font-family: var(--display); font-weight: 600; font-size: clamp(28px,3.6vw,40px); color: var(--clay-deep); line-height: 1; letter-spacing: -0.03em; }
.cs-outcome .lab { font-family: var(--mono); font-size: 12px; line-height: 1.5; color: var(--ink-2); margin-top: 12px; }
@media (max-width: 640px){ .cs-outcome { grid-template-columns: 1fr; gap: 22px; } }

.cs-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 88px; border-top: 1px solid var(--line); }
.cs-nav a { padding: 38px 0; transition: padding .25s; }
.cs-nav a:hover { color: var(--clay-deep); }
.cs-nav .dir { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.cs-nav .t { font-family: var(--display); font-weight: 600; font-size: 22px; letter-spacing: -0.02em; }
.cs-nav .next { text-align: right; }
.cs-nav a:hover .dir { color: var(--clay-deep); }
@media (max-width: 640px){ .cs-nav { grid-template-columns: 1fr; } .cs-nav .next { text-align: left; } }

/* ============================================================ reveal + a11y */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--clay-deep); outline-offset: 3px; border-radius: 3px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition: none !important; }
}