/* =========================================================
   Mayukh Mukherjee — Portfolio
   Design system: "Blueprint" — navy ink, paper ground,
   bronze/silver/gold accent drawn from medallion (lakehouse)
   architecture — bronze -> silver -> gold refinement, used as
   the career-timeline signature.
   ========================================================= */

:root{
  --navy: #0F1C33;
  --navy-2: #16294A;
  --paper: #F2F4F6;
  --paper-2: #E9ECEF;
  --ink: #121826;
  --steel: #56616F;
  --steel-light: #8893A1;
  --hairline: #D4DAE1;
  --hairline-dark: #2A3B59;

  --bronze: #A8754C;
  --silver: #8C97A6;
  --gold: #C7A24E;

  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  --max: 1080px;
}

*, *::before, *::after{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

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

.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- eyebrow / labels ---------- */
.eyebrow{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bronze);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before{
  content: "";
  width: 22px;
  height: 1px;
  background: var(--bronze);
  display: inline-block;
}

/* ---------- header ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--navy);
  border-bottom: 1px solid var(--hairline-dark);
}
.site-header .wrap{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand{
  display: flex;
  align-items: center;
  gap: 12px;
  color: #F4F1E9;
}
.brand-mark{
  width: 34px;
  height: 34px;
  border: 1px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--gold);
}
.brand-name{
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.01em;
}
.brand-role{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel-light);
  display: block;
  margin-top: 2px;
}
nav.site-nav{
  display: flex;
  align-items: center;
  gap: 28px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
nav.site-nav a{
  color: #C7CEDA;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
nav.site-nav a:hover,
nav.site-nav a.active{
  color: var(--gold);
  border-bottom-color: var(--gold);
}
nav.site-nav a.nav-cta{
  color: var(--navy);
  background: var(--gold);
  padding: 8px 14px;
  border-bottom: none;
}
nav.site-nav a.nav-cta:hover{ background:#D9B568; color: var(--navy); }

/* ---------- hero ---------- */
.hero{
  position: relative;
  background: var(--navy);
  color: #EDEFF3;
  overflow: hidden;
  padding: 88px 0 0;
}
.hero::before{
  /* faint blueprint grid */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(199,162,78,0.06) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(199,162,78,0.06) 0 1px, transparent 1px 64px);
  pointer-events: none;
}
.hero .wrap{
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 56px;
  align-items: end;
  padding-bottom: 56px;
}
.hero-title{
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.05;
  margin: 18px 0 16px;
  color: #FFFFFF;
}
.hero-sub{
  font-size: 18px;
  color: #B9C2D0;
  max-width: 46ch;
  margin: 0 0 28px;
}
.hero-meta{
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--mono);
  font-size: 13px;
  color: #9FAAB9;
  margin-bottom: 28px;
}
.hero-meta span{ display:inline-flex; align-items:center; gap:8px; }

.hero-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.btn{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 13px 20px;
  border: 1px solid var(--gold);
  color: var(--gold);
  transition: background .15s ease, color .15s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn:hover{ background: var(--gold); color: var(--navy); }
.btn.solid{ background: var(--gold); color: var(--navy); }
.btn.solid:hover{ background: #D9B568; }

.hero-photo{
  position: relative;
  justify-self: end;
  width: 240px;
}
.hero-photo .frame{
  border: 1px solid var(--gold);
  padding: 10px;
}
.hero-photo img{
  width: 100%;
  height: auto;
  filter: grayscale(8%) contrast(1.02);
  display: block;
}
.hero-photo .tick{
  position: absolute;
  width: 14px; height: 14px;
  border-top: 1px solid var(--gold);
  border-left: 1px solid var(--gold);
}
.hero-photo .tick.tl{ top: -6px; left: -6px; }
.hero-photo .tick.br{
  bottom: -6px; right: -6px;
  border-top: none; border-left: none;
  border-bottom: 1px solid var(--gold);
  border-right: 1px solid var(--gold);
}

/* ---------- stats strip ---------- */
.stats{
  background: var(--navy-2);
  border-top: 1px solid var(--hairline-dark);
}
.stats .wrap{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat{
  padding: 26px 28px;
  border-left: 1px solid var(--hairline-dark);
}
.stat:first-child{ border-left: none; padding-left: 0; }
.stat .num{
  font-family: var(--serif);
  font-size: 32px;
  color: #FFFFFF;
}
.stat .label{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #93A0B2;
  margin-top: 4px;
}

/* ---------- sections ---------- */
section{ padding: 80px 0; }
section + section{ border-top: 1px solid var(--hairline); }
.section-head{ margin-bottom: 36px; max-width: 64ch; }
.section-head h2{
  font-family: var(--serif);
  font-weight: 600;
  font-size: 32px;
  margin: 12px 0 0;
  color: var(--ink);
}
.section-head .lede{
  color: var(--steel);
  margin-top: 14px;
  font-size: 16px;
}

/* summary */
.summary-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.summary-grid p{ color: var(--ink); margin: 0 0 16px; }
.summary-grid .lead-graf{
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.5;
  color: var(--ink);
}
.summary-list{
  list-style: none;
  margin: 0;
  padding: 0;
}
.summary-list li{
  padding: 14px 0;
  border-top: 1px solid var(--hairline);
  font-size: 15px;
  color: var(--steel);
  display: flex;
  gap: 14px;
}
.summary-list li:last-child{ border-bottom: 1px solid var(--hairline); }
.summary-list .tag{
  font-family: var(--mono);
  font-size: 11px;
  color: var(--bronze);
  white-space: nowrap;
  padding-top: 2px;
}

/* expertise / skills */
.expertise-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.expertise-card{
  background: var(--paper);
  padding: 26px 26px 22px;
}
.expertise-card h3{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bronze);
  margin: 0 0 14px;
}
.expertise-card ul{
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14.5px;
  color: var(--ink);
}
.expertise-card li{
  padding: 6px 0;
  border-top: 1px dashed var(--hairline);
}
.expertise-card li:first-child{ border-top: none; }

/* education on home */
.edu-list{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.edu-item{
  border-left: 2px solid var(--gold);
  padding-left: 18px;
}
.edu-item .deg{ font-family: var(--serif); font-size: 18px; }
.edu-item .school{ color: var(--steel); margin-top: 4px; font-size: 14.5px; }
.edu-item .yr{ font-family: var(--mono); font-size: 12px; color: var(--bronze); margin-top: 6px; display:block; }

/* ---------- timeline (the signature element) ---------- */
.timeline{
  position: relative;
  margin-top: 8px;
}
.timeline::before{
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), var(--silver) 55%, var(--bronze));
}
.t-item{
  position: relative;
  padding-left: 38px;
  padding-bottom: 48px;
}
.t-item:last-child{ padding-bottom: 0; }
.t-item .node{
  position: absolute;
  left: 0; top: 4px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}
.t-item.tier-silver .node{ border-color: var(--silver); }
.t-item.tier-bronze .node{ border-color: var(--bronze); }

.t-head{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-bottom: 6px;
}
.t-role{ font-family: var(--serif); font-size: 22px; color: var(--ink); }
.t-dates{ font-family: var(--mono); font-size: 12px; color: var(--bronze); white-space: nowrap; }
.t-org{
  font-size: 14.5px;
  color: var(--steel);
  margin-bottom: 4px;
}
.t-org .co{ color: var(--ink); font-weight: 600; }
.t-sub{
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .03em;
  color: var(--steel-light);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.t-bullets{
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 70ch;
}
.t-bullets li{
  position: relative;
  padding-left: 18px;
  margin-bottom: 9px;
  font-size: 14.5px;
  color: var(--ink);
}
.t-bullets li::before{
  content: "—";
  position: absolute;
  left: 0;
  color: var(--steel-light);
}

.timeline-caption{
  font-family: var(--serif);
  font-style: italic;
  color: var(--steel);
  font-size: 15px;
  margin: -10px 0 36px;
  max-width: 60ch;
}

.tl-cta{
  margin-top: 36px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.tl-cta a{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--navy);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
}
.tl-cta a:hover{ color: var(--bronze); }

/* prior work table */
.table-wrap{ overflow-x: auto; }
table.prior{
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
table.prior th{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--steel);
  text-align: left;
  padding: 0 16px 12px 0;
  border-bottom: 1px solid var(--hairline-dark);
}
table.prior td{
  padding: 16px 16px 16px 0;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
table.prior td.org{ font-weight: 600; color: var(--ink); }
table.prior td.tenure{ font-family: var(--mono); font-size: 12.5px; color: var(--bronze); white-space: nowrap; }
table.prior td.desc{ color: var(--steel); max-width: 46ch; }

/* awards */
.awards-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.award-card{
  background: var(--paper);
  padding: 24px 22px;
  border-top: 2px solid var(--gold);
}
.award-card .yr{ font-family: var(--mono); font-size: 12px; color: var(--bronze); }
.award-card h3{ font-family: var(--serif); font-size: 17px; margin: 8px 0 10px; }
.award-card p{ font-size: 13.5px; color: var(--steel); margin: 0; }

/* geographies */
.geo-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.geo-item .reg{
  font-family: var(--mono);
  font-size: 11px;
  color: var(--bronze);
  letter-spacing: .08em;
}
.geo-item .places{
  font-family: var(--serif);
  font-size: 17px;
  margin-top: 8px;
}

/* dark CTA / footer */
.cta-band{
  background: var(--navy);
  color: #EDEFF3;
}
.cta-band .wrap{
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding: 56px 32px;
}
.cta-band h2{
  font-family: var(--serif);
  font-size: 28px;
  margin: 0;
  max-width: 28ch;
}
.cta-band .actions{ display:flex; gap: 12px; flex-wrap: wrap; }

footer.site-footer{
  background: var(--navy);
  border-top: 1px solid var(--hairline-dark);
}
footer.site-footer .wrap{
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 24px 32px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: #8893A1;
  letter-spacing: .03em;
}
footer.site-footer a{ color: #C7CEDA; }
footer.site-footer a:hover{ color: var(--gold); }

/* ---------- responsive ---------- */
@media (max-width: 880px){
  .hero .wrap{ grid-template-columns: 1fr; padding-top: 8px; }
  .hero-photo{ justify-self: start; width: 160px; order: -1; }
  .stats .wrap{ grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3){ border-left: none; }
  .stat{ border-left: none; border-top: 1px solid var(--hairline-dark); padding-top: 18px; }
  .stat:first-child, .stat:nth-child(2){ border-top: none; }
  .summary-grid{ grid-template-columns: 1fr; }
  .expertise-grid{ grid-template-columns: 1fr 1fr; }
  .edu-list{ grid-template-columns: 1fr; }
  .awards-grid{ grid-template-columns: 1fr 1fr; }
  .geo-grid{ grid-template-columns: 1fr 1fr; }
  nav.site-nav{ gap: 16px; }
}
@media (max-width: 560px){
  .wrap{ padding: 0 20px; }
  section{ padding: 56px 0; }
  .expertise-grid{ grid-template-columns: 1fr; }
  .awards-grid{ grid-template-columns: 1fr; }
  .geo-grid{ grid-template-columns: 1fr; }
  .t-head{ flex-direction: column; align-items: flex-start; }
  .cta-band .wrap{ flex-direction: column; align-items: flex-start; }
  table.prior td.desc{ max-width: none; }
}