/* ==========================================================================
   Rayyan Ahmad — Portfolio
   Design system: circuit / network topology motif
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  /* palette */
  --bg:            #0a0e1a;
  --bg-alt:        #0d1322;
  --bg-elevated:   #121a2e;
  --bg-card:       #141c33;
  --bg-card-hover: #182342;
  --line:          rgba(160, 180, 220, 0.12);
  --line-strong:   rgba(160, 180, 220, 0.22);

  --teal:          #2bd9b9;
  --teal-dim:      rgba(43, 217, 185, 0.14);
  --amber:         #f5a83c;
  --amber-dim:     rgba(245, 168, 60, 0.14);

  --text:          #eef1f8;
  --text-muted:    #97a1b8;
  --text-dim:      #5e6883;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --container: 1160px;

  --ease: cubic-bezier(.16,.84,.44,1);
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* background circuit texture */
body::before{
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 15% 8%, rgba(43,217,185,0.07), transparent 40%),
    radial-gradient(circle at 85% 92%, rgba(245,168,60,0.06), transparent 45%),
    var(--bg);
  pointer-events: none;
}

body::after{
  content:'';
  position: fixed;
  inset:0;
  z-index:-1;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 75%);
  pointer-events: none;
}

h1,h2,h3,h4{
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}

p{ margin: 0 0 1em; color: var(--text-muted); }
a{ color: inherit; text-decoration: none; }
img{ max-width: 100%; display: block; }
ul{ margin:0; padding:0; list-style: none; }

.mono{ font-family: 'JetBrains Mono', monospace; }

.eyebrow{
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.eyebrow::before{
  content:'';
  width: 22px; height: 1px;
  background: var(--teal);
  display:inline-block;
}

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------------------------------- nav ---------------------------------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px) saturate(140%);
  background: rgba(10,14,26,0.72);
  border-bottom: 1px solid var(--line);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 18px 28px;
  max-width: var(--container);
  margin: 0 auto;
}
.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  font-family:'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.brand .node-dot{
  width:9px;height:9px;border-radius:50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px var(--teal-dim);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot{
  0%,100%{ box-shadow: 0 0 0 4px var(--teal-dim); }
  50%{ box-shadow: 0 0 0 8px transparent; }
}

.nav-links{
  display:flex;
  gap: 6px;
  align-items:center;
}
.nav-links a{
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 20px;
  transition: color .25s var(--ease), background .25s var(--ease);
  position: relative;
}
.nav-links a:hover{ color: var(--text); background: var(--bg-elevated); }
.nav-links a.active{ color: var(--bg); background: var(--teal); }

.nav-cta{
  display:flex; gap:12px; align-items:center;
}

.nav-toggle{
  display:none;
  background:none; border:1px solid var(--line-strong);
  border-radius: 8px;
  width:40px; height:40px;
  color: var(--text);
  cursor:pointer;
  align-items:center; justify-content:center;
}

/* ------------------------------- buttons -------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:'Inter',sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 12px 22px;
  border-radius: 30px;
  border: 1px solid transparent;
  cursor:pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
  white-space: nowrap;
}
.btn-primary{
  background: var(--teal);
  color: #06231d;
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 10px 30px -8px rgba(43,217,185,0.55); }
.btn-ghost{
  background: transparent;
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-ghost:hover{ border-color: var(--teal); color: var(--teal); transform: translateY(-2px); }
.btn-sm{ padding: 9px 16px; font-size: 0.82rem; }

/* -------------------------------- hero ----------------------------------- */
.hero{
  position: relative;
  padding: 92px 0 80px;
  overflow: hidden;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items:center;
}
.hero-kicker{
  display:flex; align-items:center; gap:10px;
  margin-bottom: 22px;
}
.status-chip{
  display:inline-flex; align-items:center; gap:8px;
  font-family:'JetBrains Mono',monospace;
  font-size: 0.74rem;
  color: var(--teal);
  background: var(--teal-dim);
  border: 1px solid rgba(43,217,185,0.3);
  padding: 6px 12px;
  border-radius: 20px;
}
.status-chip .dot{ width:6px;height:6px;border-radius:50%; background:var(--teal); animation: pulse-dot 2s infinite; }

.hero h1{
  font-size: clamp(2.4rem, 4.6vw, 3.7rem);
  color: var(--text);
}
.hero h1 span{
  background: linear-gradient(100deg, var(--teal), var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead{
  font-size: 1.08rem;
  max-width: 540px;
  margin-bottom: 30px;
}
.hero-actions{ display:flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }

.hero-meta{
  display:flex; gap: 28px; flex-wrap:wrap;
}
.hero-meta div{ }
.hero-meta .num{
  font-family:'Space Grotesk',sans-serif;
  font-size: 1.5rem; font-weight:700; color: var(--text);
}
.hero-meta .label{
  font-family:'JetBrains Mono',monospace;
  font-size: 0.68rem; letter-spacing:.08em; text-transform:uppercase; color: var(--text-dim);
}

/* portrait / network visual */
.hero-visual{
  position: relative;
  display:flex; align-items:center; justify-content:center;
}
.node-canvas-wrap{
  position: relative;
  width: 100%;
  aspect-ratio: 1/1;
  max-width: 440px;
  margin: 0 auto;
}
#networkCanvas{
  position:absolute; inset:0;
  width:100%; height:100%;
}
.portrait-ring{
  position:absolute;
  inset: 14%;
  border-radius: 50%;
  overflow:hidden;
  border: 2px solid var(--line-strong);
  box-shadow: 0 0 0 10px var(--bg), 0 30px 60px -20px rgba(0,0,0,0.6);
  background: var(--bg-elevated);
}
.portrait-ring img{ width:100%; height:100%; object-fit:cover; }

/* ------------------------------ sections --------------------------------- */
section{ padding: 88px 0; position: relative; }
.section-head{
  display:flex; justify-content:space-between; align-items:flex-end;
  gap: 20px; margin-bottom: 44px; flex-wrap: wrap;
}
.section-head h2{ font-size: clamp(1.7rem, 3vw, 2.3rem); }
.section-head p{ max-width: 460px; margin:0; }

.divider-trace{
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  margin: 0;
}

/* reveal on scroll */
.reveal{ opacity:0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in-view{ opacity:1; transform: translateY(0); }
.reveal-stagger > *{ opacity:0; transform: translateY(24px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal-stagger.in-view > *{ opacity:1; transform: translateY(0); }
.reveal-stagger.in-view > *:nth-child(1){ transition-delay: .02s; }
.reveal-stagger.in-view > *:nth-child(2){ transition-delay: .09s; }
.reveal-stagger.in-view > *:nth-child(3){ transition-delay: .16s; }
.reveal-stagger.in-view > *:nth-child(4){ transition-delay: .23s; }
.reveal-stagger.in-view > *:nth-child(5){ transition-delay: .30s; }
.reveal-stagger.in-view > *:nth-child(6){ transition-delay: .37s; }

/* --------------------------------- cards --------------------------------- */
.card{
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 26px;
  transition: transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease);
}
.card:hover{ transform: translateY(-5px); border-color: var(--line-strong); background: var(--bg-card-hover); }

.grid{ display:grid; gap: 22px; }
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-2{ grid-template-columns: repeat(2, 1fr); }

/* skill / stat tags */
.tag{
  display:inline-flex; align-items:center; gap:6px;
  font-family:'JetBrains Mono',monospace;
  font-size: 0.74rem;
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--line-strong);
  color: var(--text-muted);
  background: var(--bg-elevated);
}

/* timeline (experience/education) */
.timeline{ position: relative; padding-left: 32px; }
.timeline::before{
  content:'';
  position:absolute; left: 5px; top: 6px; bottom: 6px;
  width: 1px;
  background: linear-gradient(var(--teal), var(--line) 90%);
}
.timeline-item{ position: relative; padding-bottom: 40px; }
.timeline-item:last-child{ padding-bottom: 0; }
.timeline-item::before{
  content:'';
  position:absolute; left: -32px; top: 4px;
  width: 11px; height:11px; border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--teal);
  box-shadow: 0 0 0 4px var(--teal-dim);
}
.timeline-item .when{
  font-family:'JetBrains Mono',monospace;
  font-size: 0.72rem;
  color: var(--amber);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 6px;
  display:block;
}
.timeline-item h3{ font-size: 1.1rem; margin-bottom: 2px; }
.timeline-item .org{ color: var(--teal); font-size: 0.88rem; font-weight:500; margin-bottom:10px; display:block; }

/* progress bars for skills */
.skill-bar{ margin-bottom: 18px; }
.skill-bar .row{ display:flex; justify-content:space-between; font-size:0.86rem; margin-bottom:8px; }
.skill-bar .track{ height:6px; border-radius:4px; background: var(--bg-elevated); overflow:hidden; }
.skill-bar .fill{ height:100%; border-radius:4px; background: linear-gradient(90deg, var(--teal), var(--amber)); width:0%; transition: width 1.2s var(--ease); }

/* certificate grid */
.cert-card{
  cursor:pointer;
  display:flex; flex-direction:column; gap:14px;
}
.cert-card .cert-icon{
  width:44px;height:44px;border-radius:10px;
  background: var(--teal-dim);
  color: var(--teal);
  display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;
}
.cert-card h4{ font-size:1rem; margin-bottom:4px; }
.cert-card .issuer{ font-size:0.82rem; color:var(--text-dim); }
.cert-card .view-link{
  margin-top:auto;
  font-family:'JetBrains Mono',monospace;
  font-size:0.72rem;
  color: var(--amber);
  display:flex; align-items:center; gap:6px;
}

/* modal (certificate viewer) */
.modal-overlay{
  position: fixed; inset:0; z-index: 1000;
  background: rgba(4,6,12,0.82);
  backdrop-filter: blur(6px);
  display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none;
  transition: opacity .3s var(--ease);
  padding: 40px 20px;
}
.modal-overlay.open{ opacity:1; pointer-events:auto; }
.modal-box{
  background: var(--bg-elevated);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  width: min(880px, 100%);
  max-height: 86vh;
  display:flex; flex-direction:column;
  transform: scale(.94) translateY(10px);
  transition: transform .35s var(--ease);
  overflow:hidden;
}
.modal-overlay.open .modal-box{ transform: scale(1) translateY(0); }
.modal-head{
  display:flex; justify-content:space-between; align-items:center;
  padding: 16px 22px; border-bottom: 1px solid var(--line);
}
.modal-head h4{ margin:0; font-size:1rem; }
.modal-close{
  background:none;border:1px solid var(--line-strong); color:var(--text);
  width:32px;height:32px;border-radius:50%; cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition: border-color .2s, color .2s;
}
.modal-close:hover{ border-color: var(--teal); color: var(--teal); }
.modal-body{ flex:1; overflow:auto; background:#0c1120; }
.modal-body iframe{ width:100%; height: 72vh; border:none; display:block; }
.modal-foot{ padding: 14px 22px; border-top: 1px solid var(--line); display:flex; justify-content:flex-end; }

/* project card */
.project-card{ overflow:hidden; padding:0; }
.project-thumb{ aspect-ratio: 16/10; overflow:hidden; position:relative; }
.project-thumb img{ width:100%; height:100%; object-fit:cover; transition: transform .6s var(--ease); }
.project-card:hover .project-thumb img{ transform: scale(1.06); }
.project-thumb::after{
  content:''; position:absolute; inset:0;
  background: linear-gradient(180deg, transparent 40%, rgba(6,9,18,0.85));
}
.project-body{ padding: 22px; }
.project-body .cat{ font-family:'JetBrains Mono',monospace; font-size:0.7rem; color:var(--amber); text-transform:uppercase; letter-spacing:.08em; }
.project-body h3{ font-size: 1.12rem; margin: 8px 0 8px; }

/* services */
.service-card{ text-align:left; }
.service-card .num{
  font-family:'Space Grotesk',sans-serif;
  font-size: 0.8rem; color: var(--text-dim);
  margin-bottom: 14px; display:block;
}
.service-card .icon{
  width: 46px; height:46px; border-radius: 12px;
  display:flex; align-items:center; justify-content:center;
  background: var(--amber-dim); color: var(--amber);
  margin-bottom: 18px; font-size:1.25rem;
}

/* contact */
.contact-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.social-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap:14px; }
.social-card{
  display:flex; flex-direction:column; gap:10px; align-items:flex-start;
  padding: 20px; text-align:left;
}
.social-card .icon{ font-size:1.3rem; color: var(--teal); }
.social-card .handle{ color: var(--text-muted); font-size:0.86rem; }

.form-field{ margin-bottom: 18px; }
.form-field label{ display:block; font-size:0.82rem; margin-bottom:8px; color: var(--text-muted); font-family:'JetBrains Mono',monospace; }
.form-field input, .form-field textarea{
  width:100%; background: var(--bg-elevated); border:1px solid var(--line-strong);
  border-radius: 10px; padding: 13px 14px; color: var(--text); font-family:'Inter',sans-serif; font-size:0.94rem;
  transition: border-color .25s;
}
.form-field input:focus, .form-field textarea:focus{ outline:none; border-color: var(--teal); }
.form-field textarea{ resize: vertical; min-height: 120px; }

/* footer */
.site-footer{ border-top:1px solid var(--line); padding: 44px 0 30px; margin-top: 40px; }
.footer-grid{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:20px; }
.footer-links{ display:flex; gap:18px; flex-wrap:wrap; }
.footer-links a{ color: var(--text-muted); font-size:0.85rem; transition: color .2s; }
.footer-links a:hover{ color: var(--teal); }
.footer-note{ font-size:0.8rem; color: var(--text-dim); margin-top: 16px; }

/* page hero (inner pages) */
.page-hero{ padding: 64px 0 40px; }
.page-hero h1{ font-size: clamp(2rem, 4vw, 2.9rem); }
.breadcrumb{
  font-family:'JetBrains Mono',monospace; font-size:0.75rem; color:var(--text-dim);
  display:flex; align-items:center; gap:8px; margin-bottom:16px;
}
.breadcrumb a{ color:var(--teal); }

/* blog cards */
.blog-card{ display:flex; flex-direction:column; }
.blog-card .meta{ font-family:'JetBrains Mono',monospace; font-size:0.72rem; color: var(--text-dim); margin-bottom:12px; display:flex; gap:12px; }
.blog-card h3{ font-size:1.1rem; margin-bottom:10px; }
.blog-card .tags{ display:flex; gap:8px; margin-top:16px; flex-wrap:wrap; }

/* CTA band */
.cta-band{
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(43,217,185,0.12), rgba(245,168,60,0.08));
  border: 1px solid var(--line-strong);
  padding: 54px;
  text-align:center;
  position: relative;
  overflow:hidden;
}
.cta-band h2{ font-size: clamp(1.6rem,3vw,2.2rem); margin-bottom: 14px; }
.cta-band p{ max-width: 480px; margin: 0 auto 26px; }
.cta-actions{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }

/* back to top */
.back-top{
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 46px; height:46px; border-radius:50%;
  background: var(--bg-elevated); border:1px solid var(--line-strong);
  color: var(--text); display:flex; align-items:center;justify-content:center;
  cursor:pointer; opacity:0; pointer-events:none; transform: translateY(10px);
  transition: opacity .3s, transform .3s, border-color .3s;
}
.back-top.show{ opacity:1; pointer-events:auto; transform:translateY(0); }
.back-top:hover{ border-color: var(--teal); color: var(--teal); }

/* utility */
.text-center{ text-align:center; }
.mt-0{margin-top:0;}
.flex{display:flex;}
.gap-2{gap:8px;}
.gap-3{gap:14px;}

/* responsive */
@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-visual{ order:-1; }
  .grid-3{ grid-template-columns: repeat(2,1fr); }
  .contact-grid{ grid-template-columns: 1fr; }
  .social-grid{ grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 720px){
  .nav-links, .nav-cta .btn-ghost span.full{ display:none; }
  .nav-toggle{ display:flex; }
  .nav-links.mobile-open{
    display:flex; position:absolute; top:100%; left:0; right:0;
    background: var(--bg-elevated); flex-direction:column; padding:14px 20px;
    border-bottom:1px solid var(--line); gap:4px;
  }
  .grid-3, .grid-2{ grid-template-columns: 1fr; }
  .social-grid{ grid-template-columns: 1fr 1fr; }
  .section-head{ flex-direction:column; align-items:flex-start; }
  .cta-band{ padding: 34px 22px; }
}