/* ============================================================
   Dr. Faisal Hassanein — Personal Portfolio
   Built on FH Design Tokens v1.0.0 · brand-guidelines.md v1.1
   Monochrome system · Poppins 300/500 only · no accent colour
   ============================================================ */

:root{
  --ink-900:#121212;
  --paper:#FFFFFF;
  --grey-100:#DEDEDE;
  --grey-400:#9A9A9A;
  --grey-700:#4E4E4E; /* rules only — never type */

  --font:"Poppins","Helvetica Neue",Arial,sans-serif;
  --w-light:300;
  --w-medium:500;

  --tr-tight:.02em;
  --tr-normal:.04em;
  --tr-wide:.09em;   /* name — always */
  --tr-wider:.16em;  /* role line */
  --tr-widest:.24em; /* eyebrow / discipline */

  --surface:var(--ink-900);
  --on-primary:var(--paper);
  --on-secondary:var(--grey-400);
  --on-tertiary:var(--grey-100);
  --rule:var(--grey-700);
  --rule-soft:#2E2E2E;

  --maxw:1060px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--surface);
  color:var(--on-primary);
  font-family:var(--font);
  font-weight:var(--w-light);
  font-size:16.5px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--paper);color:var(--ink-900)}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- text tiers ---------- */
.eyebrow{
  font-size:11px;
  font-weight:var(--w-light);
  letter-spacing:var(--tr-widest);
  text-transform:uppercase;
  color:var(--on-tertiary);
}
.role-line{
  font-size:12px;
  font-weight:var(--w-light);
  letter-spacing:var(--tr-wider);
  text-transform:uppercase;
  color:var(--on-primary);
}
.credentials{
  font-weight:var(--w-light);
  letter-spacing:var(--tr-normal);
  color:var(--on-secondary);
}

/* short hairline rule */
.rule{
  border:0;border-top:1px solid var(--rule);
  width:2.4em;margin:22px auto;
}
.rule.left{margin:22px 0}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(18,18,18,.92);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--rule-soft);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:16px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.nav-brand{display:flex;align-items:center;gap:14px}
.nav-brand img{height:26px;width:auto}
.nav-brand span{
  font-weight:var(--w-medium);
  font-size:12.5px;
  letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  color:var(--on-primary);
  white-space:nowrap;
}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{
  font-size:11px;font-weight:var(--w-light);
  letter-spacing:var(--tr-wider);text-transform:uppercase;
  color:var(--on-secondary);
  padding:6px 0;border-bottom:1px solid transparent;
  transition:color .2s,border-color .2s;
  white-space:nowrap;
}
.nav-links a:hover,.nav-links a.active{color:var(--on-primary);border-bottom-color:var(--on-primary)}

/* ---------- hero (vertical lockup) ---------- */
.hero{
  text-align:center;
  padding:110px 24px 96px;
  border-bottom:1px solid var(--rule-soft);
}
.hero-mark{height:150px;width:auto;margin:0 auto 44px} /* clearspace ≥ 25% via margins */
.hero h1{
  font-weight:var(--w-medium);
  font-size:clamp(24px,4.4vw,40px);
  letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  line-height:1.3;
  color:var(--on-primary);
}
.hero .credentials{font-size:clamp(15px,2vw,18px);margin-top:10px}
.hero .discipline{
  font-size:clamp(11px,1.5vw,13px);
  font-weight:var(--w-light);
  letter-spacing:var(--tr-widest);
  text-transform:uppercase;
  color:var(--on-tertiary);
}
.hero .lede{
  max-width:600px;margin:34px auto 0;
  color:var(--on-secondary);
  font-size:15.5px;
}

/* ---------- section scaffolding ---------- */
.section{padding:88px 0;border-bottom:1px solid var(--rule-soft)}
.section-head{text-align:center;margin-bottom:58px}
.section-head .eyebrow{display:block;margin-bottom:16px}
.section-head h2{
  font-weight:var(--w-medium);
  font-size:clamp(20px,3vw,28px);
  letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  color:var(--on-primary);
}
.section-head .lede{
  max-width:640px;margin:26px auto 0;color:var(--on-secondary);font-size:15.5px;
}

/* ---------- doors ---------- */
.doors{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--rule);}
.door{
  padding:56px 48px;
  display:flex;flex-direction:column;
  transition:background .25s;
}
.door + .door{border-left:1px solid var(--rule)}
.door:hover{background:#181818}
.door .num{
  font-weight:var(--w-light);
  font-size:12px;letter-spacing:var(--tr-widest);
  color:var(--on-tertiary);margin-bottom:26px;
}
.door h3{
  font-weight:var(--w-medium);
  font-size:clamp(18px,2.4vw,23px);
  letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  color:var(--on-primary);
  margin-bottom:18px;
}
.door p{color:var(--on-secondary);font-size:14.5px;margin-bottom:28px}
.door ul{list-style:none;margin:0 0 34px;display:flex;flex-direction:column;gap:11px}
.door li{
  font-size:13.5px;color:var(--on-tertiary);
  padding-left:22px;position:relative;
  letter-spacing:var(--tr-tight);
}
.door li::before{
  content:"";position:absolute;left:0;top:.85em;
  width:10px;height:1px;background:var(--grey-400);
}
.door .cta{margin-top:auto}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;
  background:var(--paper);
  color:var(--ink-900);
  font-size:11.5px;font-weight:var(--w-medium);
  letter-spacing:var(--tr-wider);
  text-transform:uppercase;
  padding:16px 36px 15px;
  transition:opacity .2s;
}
.btn:hover{opacity:.82}
.btn.ghost{
  background:transparent;color:var(--on-primary);
  border:1px solid var(--grey-400);
}
.btn.ghost:hover{opacity:1;border-color:var(--paper)}

/* ---------- stats band ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  border:1px solid var(--rule);
  text-align:center;
}
.stat{padding:44px 16px 38px}
.stat + .stat{border-left:1px solid var(--rule)}
.stat .n{
  font-weight:var(--w-medium);
  font-size:clamp(26px,3.4vw,38px);
  letter-spacing:var(--tr-normal);
  color:var(--on-primary);
  line-height:1;margin-bottom:14px;
}
.stat .t{
  font-size:10.5px;font-weight:var(--w-light);
  letter-spacing:var(--tr-wider);text-transform:uppercase;
  color:var(--on-secondary);
}

/* ---------- timeline ---------- */
.timeline{position:relative;max-width:780px;margin:0 auto}
.timeline::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;
  width:1px;background:var(--rule);
}
.t-item{position:relative;padding:0 0 52px 42px}
.t-item:last-child{padding-bottom:0}
.t-item::before{
  content:"";position:absolute;left:-3.5px;top:9px;
  width:7px;height:7px;background:var(--paper);
}
.t-item .when{
  font-size:11px;font-weight:var(--w-light);
  letter-spacing:var(--tr-wider);text-transform:uppercase;
  color:var(--on-tertiary);margin-bottom:8px;
}
.t-item h3{
  font-weight:var(--w-medium);
  font-size:17px;letter-spacing:var(--tr-normal);
  color:var(--on-primary);
}
.t-item .where{
  font-size:14px;color:var(--on-secondary);
  letter-spacing:var(--tr-tight);
  margin:3px 0 14px;
}
.t-item ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.t-item li{
  font-size:14px;color:var(--on-tertiary);
  padding-left:20px;position:relative;
  letter-spacing:var(--tr-tight);
}
.t-item li::before{
  content:"";position:absolute;left:0;top:.85em;
  width:9px;height:1px;background:var(--grey-400);
}

/* ---------- card grids ---------- */
.grid{display:grid;gap:0;border:1px solid var(--rule)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3 .card + .card{border-left:1px solid var(--rule)}
.grid.cols-2 .card + .card{border-left:1px solid var(--rule)}
.card{padding:40px 36px}
.card .eyebrow{display:block;margin-bottom:16px;font-size:10px}
.card h4{
  font-weight:var(--w-medium);
  font-size:15.5px;letter-spacing:var(--tr-normal);
  color:var(--on-primary);margin-bottom:12px;
}
.card p{font-size:13.5px;color:var(--on-secondary)}

/* competency list */
.pills{
  display:flex;flex-wrap:wrap;gap:12px;justify-content:center;
  max-width:860px;margin:0 auto;
}
.pill{
  border:1px solid var(--rule);
  padding:11px 24px 10px;
  font-size:11.5px;font-weight:var(--w-light);
  letter-spacing:var(--tr-wider);
  text-transform:uppercase;
  color:var(--on-tertiary);
}

/* CE list */
.ce-list{max-width:780px;margin:0 auto}
.ce-item{
  display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  padding:18px 4px;
  border-bottom:1px solid var(--rule-soft);
}
.ce-item:first-child{border-top:1px solid var(--rule-soft)}
.ce-item .name{font-size:14px;color:var(--on-tertiary);letter-spacing:var(--tr-tight)}
.ce-item .meta{
  font-size:10.5px;font-weight:var(--w-light);
  letter-spacing:var(--tr-wider);text-transform:uppercase;
  color:var(--on-secondary);white-space:nowrap;
}

/* publication */
.pub{padding:40px 36px}
.pub + .pub{border-left:1px solid var(--rule)}
.pub .eyebrow{display:block;margin-bottom:16px;font-size:10px}
.pub h4{
  font-weight:var(--w-medium);font-size:15px;
  letter-spacing:var(--tr-tight);line-height:1.6;
  color:var(--on-primary);margin-bottom:10px;
}
.pub p{font-size:13px;color:var(--on-secondary)}

/* ---------- page hero (interior) ---------- */
.page-hero{
  text-align:center;
  padding:88px 24px 76px;
  border-bottom:1px solid var(--rule-soft);
}
.page-hero .eyebrow{display:block;margin-bottom:20px}
.page-hero h1{
  font-weight:var(--w-medium);
  font-size:clamp(22px,3.8vw,34px);
  letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  color:var(--on-primary);
}
.page-hero .lede{
  max-width:640px;margin:28px auto 0;
  color:var(--on-secondary);font-size:15.5px;
}

/* ---------- cross-link band ---------- */
.crossband{
  text-align:center;
  padding:80px 24px;
  border-bottom:1px solid var(--rule-soft);
}
.crossband h2{
  font-weight:var(--w-medium);
  font-size:clamp(18px,2.8vw,24px);
  letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  color:var(--on-primary);
  margin:18px 0 34px;
}

/* ---------- footer ---------- */
.footer{
  padding:76px 24px 48px;
  text-align:center;
}
.footer img{height:56px;width:auto;margin:0 auto 30px}
.footer .f-name{
  font-weight:var(--w-medium);
  font-size:13px;letter-spacing:var(--tr-wide);
  text-transform:uppercase;
  color:var(--on-primary);margin-bottom:6px;
}
.footer .f-cred{font-size:13px;color:var(--on-secondary);letter-spacing:var(--tr-normal);margin-bottom:34px}
.footer .f-contact{
  display:flex;gap:34px;justify-content:center;flex-wrap:wrap;
  margin-bottom:38px;
}
.footer .f-contact a{
  font-size:12.5px;font-weight:var(--w-light);
  letter-spacing:var(--tr-tight);
  color:var(--on-tertiary);
  border-bottom:1px solid var(--rule);
  padding-bottom:4px;
  transition:color .2s,border-color .2s;
}
.footer .f-contact a:hover{color:var(--on-primary);border-color:var(--grey-400)}
.footer .f-small{
  font-size:10.5px;letter-spacing:var(--tr-wider);text-transform:uppercase;
  color:var(--on-secondary);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .door,.btn{transition:none}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .doors{grid-template-columns:1fr}
  .door + .door{border-left:0;border-top:1px solid var(--rule)}
  .grid.cols-3{grid-template-columns:1fr}
  .grid.cols-3 .card + .card{border-left:0;border-top:1px solid var(--rule)}
  .stats{grid-template-columns:1fr 1fr}
  .stat:nth-child(3){border-left:0}
  .stat:nth-child(n+3){border-top:1px solid var(--rule)}
}
@media (max-width:680px){
  .nav-links{gap:18px}
  .nav-links a{font-size:9.5px;letter-spacing:.12em}
  .nav-brand span{display:none}
  .grid.cols-2{grid-template-columns:1fr}
  .grid.cols-2 .card + .card,.pub + .pub{border-left:0;border-top:1px solid var(--rule)}
  .hero{padding:80px 18px 68px}
  .hero-mark{height:112px}
  .section{padding:64px 0}
  .ce-item{flex-direction:column;gap:5px}
}