/* ============================================================
   Md Arif Shahriar - PhD Journey
   Shared stylesheet
   ============================================================ */

:root{
  --navy-900:#050b1a;
  --navy-800:#0a1428;
  --navy-700:#0f1d38;
  --navy-600:#152a4d;
  --line:rgba(120,170,255,.16);
  --line-strong:rgba(120,170,255,.32);

  --blue:#2f7fe4;
  --blue-bright:#5aa9ff;
  --blue-soft:#8fc4ff;
  --cyan:#4fd8e8;

  --text:#e8eefc;
  --text-dim:#a9b8d4;
  --text-faint:#7a8aa8;

  --card:rgba(14,26,50,.62);
  --card-hi:rgba(20,36,68,.78);

  --radius:14px;
  --maxw:1140px;
  --font:"Inter","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular",Consolas,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.7;
  color:var(--text);
  background:var(--navy-900);
  -webkit-font-smoothing:antialiased;
}

/* ---------- animated background ---------- */
#bg-canvas{
  position:fixed; inset:0;
  width:100%; height:100%;
  z-index:-2;
  display:block;
}
.bg-veil{
  position:fixed; inset:0; z-index:-1; pointer-events:none;
  background:
    radial-gradient(900px 620px at 12% 8%, rgba(47,127,228,.20), transparent 62%),
    radial-gradient(760px 560px at 88% 96%, rgba(79,216,232,.12), transparent 60%),
    linear-gradient(180deg, rgba(5,11,26,.30) 0%, rgba(5,11,26,.72) 100%);
}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{padding:64px 0}
a{color:var(--blue-bright);text-decoration:none}
a:hover{color:var(--blue-soft);text-decoration:underline}

/* ---------- header / nav ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  background:rgba(5,11,26,.72);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  gap:16px; height:66px;
}
.brand{display:flex;align-items:center;gap:11px;color:var(--text);font-weight:700;letter-spacing:.2px}
.brand:hover{text-decoration:none;color:var(--text)}
.brand .mark{
  width:34px;height:34px;border-radius:9px;flex:0 0 34px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  color:#04101f;font-weight:800;font-size:13px;letter-spacing:.5px;
}
.brand .who{display:flex;flex-direction:column;line-height:1.15}
.brand .who small{font-weight:500;font-size:11.5px;color:var(--text-faint);letter-spacing:.4px}

nav.links{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
nav.links a{
  color:var(--text-dim); font-size:14.5px; font-weight:500;
  padding:8px 13px; border-radius:9px; transition:.18s;
}
nav.links a:hover{color:#fff;background:rgba(90,169,255,.12);text-decoration:none}
nav.links a.active{color:#fff;background:rgba(90,169,255,.18);box-shadow:inset 0 0 0 1px var(--line-strong)}

.nav-toggle{
  display:none;background:none;border:1px solid var(--line-strong);
  color:var(--text);border-radius:9px;padding:7px 11px;font-size:17px;cursor:pointer;
}

/* ---------- hero ---------- */
.hero{padding:78px 0 56px}
.hero-grid{display:grid;grid-template-columns:1.35fr .9fr;gap:52px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12.5px;letter-spacing:1.6px;text-transform:uppercase;
  color:var(--blue-soft);font-weight:600;
  border:1px solid var(--line-strong);border-radius:999px;
  padding:6px 15px;background:rgba(47,127,228,.10);
}
h1.eyebrow{margin:0}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 9px var(--cyan)}
h1.name{
  font-size:clamp(2.3rem,5.2vw,3.5rem);
  line-height:1.08;margin:20px 0 12px;font-weight:800;letter-spacing:-1px;
}
h1.name .grad{
  background:linear-gradient(100deg,var(--blue-bright),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.role{font-size:1.12rem;color:var(--text-dim);margin:0 0 8px;font-weight:500}
.lede{color:var(--text-dim);font-size:1.02rem;max-width:60ch;margin:16px 0 0}

.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 20px;border-radius:11px;font-weight:600;font-size:14.5px;
  border:1px solid transparent;transition:.2s;cursor:pointer;
}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--blue),#1e63c4);color:#fff;box-shadow:0 8px 24px rgba(47,127,228,.32)}
.btn-primary:hover{color:#fff}
.btn-ghost{border-color:var(--line-strong);color:var(--text);background:rgba(255,255,255,.03)}
.btn-ghost:hover{color:#fff;background:rgba(90,169,255,.12)}

/* portrait / badge card */
.hero-card{
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:26px;backdrop-filter:blur(8px);
  box-shadow:0 20px 50px rgba(0,0,0,.38);
}
.avatar{
  width:112px;height:112px;border-radius:50%;margin:0 auto 16px;
  display:grid;place-items:center;font-size:2.1rem;font-weight:800;color:#04101f;
  background:linear-gradient(135deg,var(--blue-bright),var(--cyan));
  box-shadow:0 0 0 6px rgba(90,169,255,.10),0 0 34px rgba(79,216,232,.28);
}
/* photo version of the avatar */
img.avatar{
  display:block;
  width:132px;height:132px;
  object-fit:cover;          /* fills the circle without squashing the photo */
  object-position:center 25%; /* bias upward so the face sits in frame */
  background:var(--navy-700);
  border:3px solid rgba(90,169,255,.38);
  transition:transform .3s ease, box-shadow .3s ease;
}
img.avatar:hover{
  transform:scale(1.04);
  box-shadow:0 0 0 6px rgba(90,169,255,.14),0 0 42px rgba(79,216,232,.42);
}

.hero-card h3{margin:0;text-align:center;font-size:1.06rem}
.hero-card .sub{text-align:center;color:var(--text-faint);font-size:13px;margin:4px 0 18px}
.facts{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.facts li{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--text-dim)}
.facts li b{color:var(--text);font-weight:600}
.facts .ic{color:var(--blue-bright);flex:0 0 18px;text-align:center}

/* ---------- section headings ---------- */
.sec-head{margin-bottom:34px}
.sec-head .kicker{
  font-size:12px;letter-spacing:2px;text-transform:uppercase;
  color:var(--blue-soft);font-weight:700;margin:0 0 8px;
}
.sec-head h2{
  font-size:clamp(1.6rem,3.2vw,2.15rem);margin:0 0 10px;
  font-weight:750;letter-spacing:-.5px;
}
.sec-head p{color:var(--text-dim);margin:0;max-width:70ch}
.rule{height:3px;width:58px;border-radius:3px;background:linear-gradient(90deg,var(--blue-bright),var(--cyan));margin-top:14px}

/* ---------- cards & grids ---------- */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;backdrop-filter:blur(6px);transition:.22s;
}
.card:hover{border-color:var(--line-strong);background:var(--card-hi);transform:translateY(-3px)}
.card h3{margin:0 0 8px;font-size:1.06rem;font-weight:650}
.card p{margin:0;color:var(--text-dim);font-size:14.6px}
.card .ico{
  width:42px;height:42px;border-radius:11px;display:grid;place-items:center;
  background:rgba(47,127,228,.16);color:var(--blue-bright);
  font-size:19px;margin-bottom:14px;border:1px solid var(--line-strong);
}

/* compact section-link cards */
.navcard{
  display:flex;align-items:center;gap:13px;
  padding:17px 20px;color:var(--text);text-decoration:none;
}
.navcard:hover{text-decoration:none;color:#fff}
.navcard .ico{
  width:34px;height:34px;flex:0 0 34px;margin:0;
  font-size:16px;border-radius:9px;display:grid;place-items:center;
  background:rgba(47,127,228,.16);color:var(--blue-bright);
  border:1px solid var(--line-strong);
}
.navcard .t{font-weight:650;font-size:1.02rem;flex:1}
.navcard .go{color:var(--blue-bright);font-size:17px;transition:transform .2s}
.navcard:hover .go{transform:translateX(4px)}

/* stat strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stats.cols-3{grid-template-columns:repeat(3,1fr)}
.stat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;text-align:center;
}
.stat .n{
  font-size:1.9rem;font-weight:800;line-height:1;
  background:linear-gradient(120deg,var(--blue-bright),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat .l{font-size:12.5px;color:var(--text-faint);letter-spacing:.6px;text-transform:uppercase;margin-top:7px}

/* ---------- timeline ---------- */
.timeline{position:relative;padding-left:34px}
.timeline::before{
  content:"";position:absolute;left:9px;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--blue),rgba(79,216,232,.15));
}
.tl-item{position:relative;margin-bottom:28px}
.tl-item::before{
  content:"";position:absolute;left:-30px;top:7px;width:12px;height:12px;border-radius:50%;
  background:var(--navy-900);border:2.5px solid var(--blue-bright);
  box-shadow:0 0 12px rgba(90,169,255,.55);
}
.tl-item .when{font-size:12.5px;color:var(--cyan);font-weight:600;letter-spacing:.6px;text-transform:uppercase}
.tl-item h3{margin:5px 0 3px;font-size:1.08rem}
.tl-item .where{color:var(--text-dim);font-size:14.5px;margin:0 0 9px}
.tl-item ul{margin:8px 0 0;padding-left:19px;color:var(--text-dim);font-size:14.6px}
.tl-item li{margin-bottom:6px}

/* ---------- publication list ---------- */
.pub{
  display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line);
}
.pub:last-child{border-bottom:none}
.pub .yr{
  flex:0 0 74px;font-family:var(--mono);font-size:13px;font-weight:700;
  color:var(--cyan);padding-top:3px;
}
.pub .body{flex:1}
.pub .title{font-weight:650;font-size:1.02rem;margin:0 0 6px;color:var(--text)}
.pub .authors{color:var(--text-dim);font-size:14px;margin:0 0 6px}
.pub .authors .me{color:var(--blue-soft);font-weight:700}
.pub .venue{color:var(--text-faint);font-size:13.6px;font-style:italic;margin:0}
.pub .links{margin-top:9px;display:flex;gap:9px;flex-wrap:wrap}

.tag{
  display:inline-block;font-size:12px;font-weight:600;letter-spacing:.4px;
  padding:4px 11px;border-radius:999px;
  background:rgba(47,127,228,.14);color:var(--blue-soft);
  border:1px solid var(--line-strong);
}
.tag.warn{background:rgba(255,186,73,.12);color:#ffcf80;border-color:rgba(255,186,73,.3)}
.tag.ok{background:rgba(79,216,232,.12);color:var(--cyan);border-color:rgba(79,216,232,.3)}
.tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
table{width:100%;border-collapse:collapse;min-width:520px}
th,td{padding:14px 18px;text-align:left;font-size:14.6px;border-bottom:1px solid var(--line)}
th{color:var(--blue-soft);font-size:12.5px;letter-spacing:1px;text-transform:uppercase;font-weight:700}
tr:last-child td{border-bottom:none}
td{color:var(--text-dim)}
td b{color:var(--text);font-weight:600}

/* ---------- misc ---------- */
.callout{
  border-left:3px solid var(--blue-bright);
  background:rgba(47,127,228,.09);
  border-radius:0 12px 12px 0;padding:18px 22px;color:var(--text-dim);font-size:15px;
}
.quote{
  font-size:1.12rem;line-height:1.75;color:var(--text);font-style:italic;
  border-left:3px solid var(--cyan);padding-left:22px;margin:0;
}
ul.clean{list-style:none;padding:0;margin:0;display:grid;gap:11px}
ul.clean li{display:flex;gap:11px;align-items:flex-start;color:var(--text-dim);font-size:15px}
ul.clean li::before{content:"\25B9";color:var(--blue-bright);font-weight:700;flex:0 0 auto}

/* compact contact rows */
.crows{display:grid;gap:2px}
.crow{
  display:grid;grid-template-columns:26px 92px 1fr;gap:12px;align-items:start;
  padding:11px 0;border-bottom:1px solid var(--line);
}
.crow:last-child{border-bottom:none}
.crow .ic{color:var(--blue-bright);font-size:15px;line-height:1.5}
.crow .k{color:var(--text-faint);font-size:12.5px;letter-spacing:.7px;text-transform:uppercase;font-weight:700;padding-top:2px}
.crow .v{color:var(--text-dim);font-size:14.6px}
.crow .v b{color:var(--text);font-weight:600}
.crow .v .note{display:block;color:var(--text-faint);font-size:12.6px;margin-top:2px}
.crow .v a{word-break:break-word}
.plinks{display:flex;flex-wrap:wrap;gap:8px}
.plinks a{
  font-size:13px;padding:5px 12px;border-radius:8px;
  background:rgba(47,127,228,.12);border:1px solid var(--line-strong);color:var(--blue-soft);font-weight:600;
}
.plinks a:hover{background:rgba(47,127,228,.22);color:#fff;text-decoration:none}
@media (max-width:560px){
  .crow{grid-template-columns:22px 1fr;gap:9px}
  .crow .k{grid-column:2;padding-top:0}
  .crow .v{grid-column:2}
}

/* placeholder text still to be filled in by the author */
.todo{
  background:rgba(255,186,73,.16);
  color:#ffcf80;
  border:1px dashed rgba(255,186,73,.5);
  border-radius:6px;
  padding:1px 7px;
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.3px;
}

.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{
  font-size:13px;padding:6px 13px;border-radius:9px;
  background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--text-dim);
}

/* ---------- footer ---------- */
footer.site{
  border-top:1px solid var(--line);margin-top:40px;
  background:rgba(5,11,26,.62);backdrop-filter:blur(10px);
}
.foot{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:30px 0;flex-wrap:wrap}
.foot p{margin:0;color:var(--text-faint);font-size:13.6px}
.foot .social{display:flex;gap:10px}
.foot .social a{
  width:38px;height:38px;border-radius:10px;display:grid;place-items:center;
  border:1px solid var(--line);color:var(--text-dim);font-size:13px;font-weight:700;transition:.2s;
}
.foot .social a:hover{color:#fff;border-color:var(--blue-bright);background:rgba(47,127,228,.16);text-decoration:none}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:940px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .stats,.stats.cols-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:720px){
  .nav-toggle{display:block}
  nav.links{
    display:none;position:absolute;top:66px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:4px;padding:14px 24px 20px;
    background:rgba(6,13,30,.98);border-bottom:1px solid var(--line);
  }
  nav.links.open{display:flex}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .stats,.stats.cols-3{grid-template-columns:repeat(2,1fr)}
  section{padding:48px 0}
  .pub{flex-direction:column;gap:6px}
  .pub .yr{flex:none}
  .foot{flex-direction:column;text-align:center}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}