/* =========================================================
   SUDDHA SATTWA BASU — PORTFOLIO
   Design language: "The Gazette" — a patent-office register.
   Twenty years read as a docket: numbered exhibits, granted
   seals, hairline rules on aged paper. Built for a career
   spent turning inventions into filed, granted, licensed assets.
   ========================================================= */

:root{
  --paper:      #F6F1E4;
  --paper-deep: #EEE5CD;
  --ink:        #1B2735;
  --ink-soft:   #4B5A67;
  --ink-faint:  #7C8894;
  --brass:      #A9762F;
  --brass-deep: #7C5320;
  --rule:       #D9CBA3;
  --white:      #FFFFFF;
  --seal-red:   #7B3230;
  --shadow:     rgba(27,39,53,0.12);

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

*{ 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;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
::selection{ background:var(--brass); color:var(--white); }

/* ---------- texture ---------- */
body::before{
  content:"";
  position:fixed; inset:0; pointer-events:none; z-index:0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(27,39,53,0.035) 1px, transparent 0);
  background-size:22px 22px;
  opacity:.5;
}

/* ---------- layout shell ---------- */
.wrap{ max-width:1120px; margin:0 auto; padding:0 32px; position:relative; z-index:1; }
@media (max-width:640px){ .wrap{ padding:0 20px; } }

.hairline{ border:none; border-top:1px solid var(--rule); margin:0; }

/* ---------- header / nav ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(246,241,228,0.92);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--rule);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:76px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:34px; height:34px; border-radius:50%;
  border:1.5px solid var(--brass);
  display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:11px; letter-spacing:.03em;
  color:var(--brass-deep);
}
.brand-name{ font-family:var(--serif); font-weight:600; font-size:18px; letter-spacing:.01em; }
.brand-role{ display:block; font-family:var(--mono); font-size:10.5px; color:var(--ink-faint); letter-spacing:.06em; text-transform:uppercase; }

nav.primary{ display:flex; gap:28px; align-items:center; }
nav.primary a{
  font-family:var(--mono); font-size:12.5px; letter-spacing:.05em; text-transform:uppercase;
  color:var(--ink-soft); position:relative; padding:6px 0;
}
nav.primary a:hover, nav.primary a.active{ color:var(--brass-deep); }
nav.primary a.active::after{
  content:""; position:absolute; left:0; right:0; bottom:0; height:2px; background:var(--brass);
}
.nav-toggle{ display:none; }
@media (max-width:860px){
  nav.primary{ display:none; }
  .nav-toggle{
    display:flex; width:38px; height:38px; border:1px solid var(--rule); border-radius:50%;
    align-items:center; justify-content:center; font-family:var(--mono); font-size:12px; cursor:pointer;
    background:transparent;
  }
  nav.primary.open{
    display:flex; position:absolute; top:76px; left:0; right:0; background:var(--paper);
    flex-direction:column; padding:12px 20px 24px; border-bottom:1px solid var(--rule); gap:16px;
  }
}

/* ---------- eyebrow / labels ---------- */
.eyebrow{
  font-family:var(--mono); font-size:12px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--brass-deep); display:flex; align-items:center; gap:10px; margin-bottom:16px;
}
.eyebrow::before{ content:""; width:22px; height:1px; background:var(--brass); display:inline-block; }

/* ---------- hero ---------- */
.hero{ padding:88px 0 64px; position:relative; }
.hero-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:56px; align-items:center; }
@media (max-width:900px){ .hero-grid{ grid-template-columns:1fr; gap:40px; } }
.hero h1{
  font-family:var(--serif); font-weight:600; font-size:clamp(34px,5vw,58px);
  line-height:1.06; margin:0 0 20px; letter-spacing:-0.01em;
}
.hero h1 em{ font-style:italic; color:var(--brass-deep); font-weight:500; }
.hero p.lede{ font-size:18px; color:var(--ink-soft); max-width:520px; margin:0 0 28px; }
.hero-photo-frame{
  border:8px solid var(--white); box-shadow:0 18px 40px var(--shadow);
  transform:rotate(-1deg);
  position:relative;
}
.hero-photo-frame::after{
  content:"EXHIBIT A"; position:absolute; bottom:-14px; right:-14px;
  background:var(--ink); color:var(--paper); font-family:var(--mono); font-size:10px;
  letter-spacing:.08em; padding:6px 10px; transform:rotate(2deg);
}
.hero-photo-frame img{ width:100%; height:auto; object-fit:cover; filter:sepia(.12) contrast(1.02); }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--mono); font-size:12.5px; letter-spacing:.05em; text-transform:uppercase;
  padding:13px 22px; border:1.5px solid var(--ink); border-radius:2px;
  background:var(--ink); color:var(--paper); transition:all .18s ease;
}
.btn:hover{ background:var(--paper); color:var(--ink); }
.btn.outline{ background:transparent; color:var(--ink); border-color:var(--ink); }
.btn.outline:hover{ background:var(--ink); color:var(--paper); }
.btn.brass{ background:var(--brass-deep); border-color:var(--brass-deep); color:var(--white); }
.btn.brass:hover{ background:transparent; color:var(--brass-deep); }
.btn-row{ display:flex; gap:14px; flex-wrap:wrap; }

/* ---------- section scaffolding ---------- */
section{ padding:72px 0; position:relative; }
section.tight{ padding:48px 0; }
.section-head{ display:flex; justify-content:space-between; align-items:flex-end; gap:24px; margin-bottom:44px; flex-wrap:wrap; }
.section-head h2{ font-family:var(--serif); font-size:clamp(26px,3.4vw,38px); margin:0; font-weight:600; letter-spacing:-.01em; }
.section-head .sub{ color:var(--ink-soft); max-width:460px; font-size:15px; }
.on-paper{ background:var(--paper-deep); }
.on-ink{ background:var(--ink); color:var(--paper); }
.on-ink .eyebrow{ color:#D8B978; }
.on-ink .eyebrow::before{ background:#D8B978; }

/* ---------- claim / numbered blocks (used only where sequence is real: career chronology) ---------- */
.claim{
  display:grid; grid-template-columns:90px 1fr; gap:28px; padding:30px 0; border-top:1px solid var(--rule);
}
.claim:last-child{ border-bottom:1px solid var(--rule); }
.claim-no{ font-family:var(--mono); font-size:13px; color:var(--brass-deep); letter-spacing:.05em; padding-top:4px; }
.claim-body h3{ font-family:var(--serif); font-size:21px; margin:0 0 6px; }
.claim-meta{ font-family:var(--mono); font-size:11.5px; color:var(--ink-faint); letter-spacing:.04em; text-transform:uppercase; margin-bottom:10px; }
.claim-body p{ margin:0 0 10px; color:var(--ink-soft); font-size:15px; }

/* ---------- seal (company mark) ---------- */
.seal-card{
  display:block; background:var(--white); border:1px solid var(--rule); border-radius:4px;
  padding:28px 24px; transition:transform .18s ease, box-shadow .18s ease; position:relative;
  overflow:hidden;
}
.seal-card:hover{ transform:translateY(-4px); box-shadow:0 16px 32px var(--shadow); }
.seal{
  width:64px; height:64px; border-radius:50%; border:2px solid var(--brass-deep);
  display:flex; align-items:center; justify-content:center; margin-bottom:18px; position:relative;
}
.seal::before{
  content:""; position:absolute; inset:5px; border:1px dashed var(--brass);
  border-radius:50%;
}
.seal span{ font-family:var(--serif); font-weight:700; font-size:17px; color:var(--brass-deep); letter-spacing:.02em; }
.seal-card .co-name{ font-family:var(--serif); font-size:19px; font-weight:600; margin:0 0 4px; }
.seal-card .co-role{ font-family:var(--mono); font-size:11px; color:var(--ink-faint); text-transform:uppercase; letter-spacing:.04em; margin-bottom:12px; display:block; }
.seal-card .co-kpi{ font-size:14px; color:var(--ink-soft); margin:0; }
.seal-card .docket{
  position:absolute; top:18px; right:18px; font-family:var(--mono); font-size:9.5px; color:var(--ink-faint);
  letter-spacing:.05em; text-align:right;
}
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:22px; }
@media (max-width:900px){ .grid-3{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:640px){ .grid-3, .grid-2{ grid-template-columns:1fr; } }

/* ---------- stamp / granted ribbon ---------- */
.stamp{
  display:inline-flex; align-items:center; gap:8px; border:1.5px solid var(--seal-red); color:var(--seal-red);
  font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; text-transform:uppercase; padding:6px 12px;
  border-radius:2px; transform:rotate(-2deg);
}

/* ---------- KPI strip ---------- */
.kpi-strip{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; border:1px solid var(--rule); border-radius:4px; overflow:hidden; background:var(--white); }
.kpi{ padding:26px 20px; border-right:1px solid var(--rule); }
.kpi:last-child{ border-right:none; }
.kpi .num{ font-family:var(--serif); font-size:30px; font-weight:600; color:var(--brass-deep); display:block; }
.kpi .label{ font-family:var(--mono); font-size:11px; color:var(--ink-soft); text-transform:uppercase; letter-spacing:.04em; }
@media (max-width:760px){ .kpi-strip{ grid-template-columns:repeat(2,1fr); } .kpi{ border-bottom:1px solid var(--rule); } }

/* ---------- skills ledger ---------- */
.ledger{ border-top:1px solid var(--rule); }
.ledger-row{
  display:grid; grid-template-columns:64px 260px 1fr; gap:24px; padding:26px 0; border-bottom:1px solid var(--rule);
  align-items:start;
}
@media (max-width:760px){ .ledger-row{ grid-template-columns:44px 1fr; } .ledger-row .ledger-title{ grid-column:2; } .ledger-row .ledger-desc{ grid-column:2; } }
.ledger-no{ font-family:var(--mono); color:var(--brass-deep); font-size:13px; padding-top:3px; }
.ledger-title{ font-family:var(--serif); font-size:19px; font-weight:600; }
.ledger-desc{ color:var(--ink-soft); font-size:14.5px; }
.tag-row{ display:flex; gap:8px; flex-wrap:wrap; margin-top:10px; }
.tag{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.03em; color:var(--ink-soft);
  border:1px solid var(--rule); border-radius:20px; padding:4px 11px; background:var(--white);
}

/* ---------- education cards ---------- */
.edu-card{ background:var(--white); border:1px solid var(--rule); border-radius:4px; padding:30px; }
.edu-card h3{ font-family:var(--serif); font-size:21px; margin:0 0 4px; }
.edu-card .inst{ font-family:var(--mono); font-size:12px; color:var(--brass-deep); letter-spacing:.04em; margin-bottom:14px; display:block; }
.edu-card p{ color:var(--ink-soft); font-size:14.5px; margin:0; }

/* ---------- quote / photo caption block ---------- */
.figure{ text-align:center; }
.figure img{ border:8px solid var(--white); box-shadow:0 14px 30px var(--shadow); margin:0 auto; }
.figure figcaption{ font-family:var(--mono); font-size:12px; color:var(--ink-faint); letter-spacing:.03em; margin-top:14px; }

/* ---------- gallery ---------- */
.gallery{ display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
@media (max-width:760px){ .gallery{ grid-template-columns:1fr 1fr; } }
.gallery figure{ margin:0; }
.gallery img{ width:100%; height:220px; object-fit:cover; filter:sepia(.1) contrast(1.02); }
.gallery figcaption{ font-family:var(--mono); font-size:10.5px; color:var(--ink-faint); margin-top:8px; letter-spacing:.02em; }

/* ---------- case study detail page ---------- */
.cs-hero{ padding:56px 0 40px; border-bottom:1px solid var(--rule); }
.cs-hero .seal{ width:88px; height:88px; }
.cs-hero .seal span{ font-size:22px; }
.cs-meta-strip{ display:flex; gap:32px; flex-wrap:wrap; margin-top:22px; }
.cs-meta-strip div{ font-family:var(--mono); font-size:11px; color:var(--ink-soft); text-transform:uppercase; letter-spacing:.04em; }
.cs-meta-strip strong{ display:block; font-family:var(--serif); color:var(--ink); font-size:16px; text-transform:none; letter-spacing:0; margin-top:3px; }
.cs-body{ max-width:760px; }
.cs-body h2{ font-family:var(--serif); font-size:26px; margin:44px 0 16px; }
.cs-body ul{ padding-left:20px; }
.cs-body li{ margin-bottom:10px; color:var(--ink-soft); }
.pager{ display:flex; justify-content:space-between; padding:36px 0; border-top:1px solid var(--rule); font-family:var(--mono); font-size:12.5px; text-transform:uppercase; letter-spacing:.05em; }

/* ---------- footer ---------- */
footer.site-footer{ background:var(--ink); color:var(--paper); padding:56px 0 36px; margin-top:40px; }
footer .foot-grid{ display:flex; justify-content:space-between; gap:32px; flex-wrap:wrap; }
footer h4{ font-family:var(--serif); font-size:19px; margin:0 0 10px; }
footer p{ color:#B9C2CA; font-size:14px; max-width:340px; }
footer .links{ display:flex; gap:22px; flex-wrap:wrap; }
footer a{ font-family:var(--mono); font-size:12px; letter-spacing:.04em; text-transform:uppercase; color:#D8B978; }
footer a:hover{ text-decoration:underline; }
.copyright{ margin-top:36px; padding-top:20px; border-top:1px solid #33414f; font-family:var(--mono); font-size:11px; color:#7C8894; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; }

/* ---------- misc ---------- */
.prose{ max-width:680px; font-size:16px; color:var(--ink-soft); }
.prose p{ margin:0 0 18px; }
.two-col{ display:grid; grid-template-columns:1fr 1fr; gap:48px; }
@media (max-width:800px){ .two-col{ grid-template-columns:1fr; } }
.center{ text-align:center; }
.mt-lg{ margin-top:48px; }
.reveal{ opacity:0; transform:translateY(14px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){ .reveal{ opacity:1; transform:none; transition:none; } }