/* =========================================================
   Afsan Habib — Portfolio
   Design tokens
========================================================= */
:root{
  --bg: #FFFFFF;
  --bg-soft: #F6F6F3;
  --ink: #14161A;
  --ink-soft: #5B5F67;
  --ink-faint: #8A8E96;
  --line: #E4E4E0;
  --line-strong: #D3D3CD;
  --accent: #2E4FF0;
  --accent-ink: #1B2E99;
  --accent-soft: #EEF1FE;

  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Menlo, monospace;

  --radius-s: 6px;
  --radius-m: 10px;
  --maxw: 1120px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}

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

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul, ol{ margin:0; padding:0; list-style:none; }
button{ font:inherit; }

.mono{ font-family:var(--font-mono); }

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

.skip-link{
  position:absolute; left:-999px; top:0;
  background:var(--ink); color:#fff; padding:10px 16px; z-index:200;
}
.skip-link:focus{ left:16px; top:16px; }

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

/* =========================================================
   Buttons
========================================================= */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:13px 24px;
  border-radius:var(--radius-s);
  font-family:var(--font-display);
  font-weight:500;
  font-size:15px;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}
.btn-primary{
  background:var(--ink); color:#fff;
}
.btn-primary:hover{ background:var(--accent); transform:translateY(-1px); }
.btn-ghost{
  background:transparent; color:var(--ink); border-color:var(--line-strong);
}
.btn-ghost:hover{ border-color:var(--ink); transform:translateY(-1px); }
.btn-block{ width:100%; }

/* =========================================================
   Header / Nav
========================================================= */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  max-width:var(--maxw);
  margin:0 auto;
  padding:16px 28px;
  display:flex; align-items:center; justify-content:space-between;
  gap:24px;
}
.nav-mark{
  font-family:var(--font-display);
  font-weight:600;
  font-size:18px;
  letter-spacing:-.01em;
}
.nav-mark-dot{ color:var(--accent); }

.nav-links{
  display:flex; gap:28px;
  flex:1;
  justify-content:center;
}
.nav-links a{
  font-size:14.5px;
  color:var(--ink-soft);
  transition:color .15s var(--ease);
  position:relative;
}
.nav-links a:hover{ color:var(--ink); }

.nav-actions{ display:flex; align-items:center; gap:14px; }
.icon-link{
  color:var(--ink-soft);
  display:inline-flex;
  transition:color .15s var(--ease);
}
.icon-link:hover{ color:var(--accent); }

.menu-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  background:none; border:none; cursor:pointer;
  padding:6px;
}
.menu-toggle span{
  width:20px; height:2px; background:var(--ink); display:block;
  transition:transform .25s var(--ease), opacity .25s var(--ease);
}
.menu-toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2){ opacity:0; }
.menu-toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero
========================================================= */
.hero{
  padding:72px 0 40px;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:56px;
  align-items:center;
}
.eyebrow{
  font-size:13px;
  color:var(--accent-ink);
  background:var(--accent-soft);
  display:inline-block;
  padding:6px 12px;
  border-radius:100px;
  margin:0 0 22px;
  letter-spacing:.01em;
}
.hero-title{
  font-family:var(--font-display);
  font-size:clamp(32px, 4.4vw, 52px);
  line-height:1.08;
  letter-spacing:-.02em;
  font-weight:600;
  margin:0 0 22px;
}
.hero-sub{
  font-size:17px;
  color:var(--ink-soft);
  max-width:52ch;
  margin:0 0 32px;
}
.hero-ctas{ display:flex; gap:14px; margin-bottom:28px; flex-wrap:wrap; }
.hero-links{ font-size:13.5px; color:var(--ink-faint); }
.hero-links a{ color:var(--ink-soft); }
.hero-links a:hover{ color:var(--accent); }
.hero-links .dot{ margin:0 10px; }

.hero-visual{ display:flex; justify-content:center; }
.portrait{
  width:min(340px, 100%);
  aspect-ratio:6/7;
  border-radius:var(--radius-m);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--bg-soft);
}
.portrait img{ width:100%; height:100%; object-fit:cover; }

/* Signature pipeline element */
.pipeline{
  margin-top:56px;
  padding:28px 20px;
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  display:flex; align-items:center; justify-content:space-between;
  gap:6px;
  overflow-x:auto;
}
.pipeline-node{
  display:flex; flex-direction:column; align-items:center; gap:8px;
  min-width:64px;
  flex-shrink:0;
}
.pipeline-dot{
  width:9px; height:9px; border-radius:50%;
  background:var(--ink);
}
.pipeline-dot-end{ background:var(--accent); }
.pipeline-label{
  font-size:11.5px;
  color:var(--ink-soft);
  white-space:nowrap;
}
.pipeline-line{
  flex:1;
  height:1px;
  background:var(--line-strong);
  position:relative;
  min-width:28px;
}
.pipeline-pulse{
  position:absolute; top:50%; left:0;
  width:6px; height:6px;
  margin-top:-3px;
  border-radius:50%;
  background:var(--accent);
  animation:travel 3.6s linear infinite;
  opacity:0;
}
@keyframes travel{
  0%{ left:0; opacity:0; }
  8%{ opacity:1; }
  92%{ opacity:1; }
  100%{ left:100%; opacity:0; }
}

/* =========================================================
   Sections (shared)
========================================================= */
.section{ padding:96px 0; border-top:1px solid var(--line); }
.section-alt{ background:var(--bg-soft); }
.section-eyebrow{
  font-size:13px; color:var(--ink-faint); margin:0 0 14px; letter-spacing:.04em; text-transform:uppercase;
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(26px, 3vw, 36px);
  font-weight:600;
  letter-spacing:-.015em;
  line-height:1.18;
  margin:0 0 18px;
  max-width:26ch;
}
.section-lead{
  color:var(--ink-soft);
  font-size:16px;
  max-width:60ch;
  margin:0 0 44px;
}

/* About */
.about-grid{ display:grid; grid-template-columns:.85fr 1.15fr; gap:48px; }
.about-body p{ color:var(--ink-soft); margin:0 0 16px; max-width:62ch; }
.about-facts{
  margin-top:56px;
  display:grid; grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line);
}
.fact{
  padding:22px 20px 0;
  border-left:1px solid var(--line);
}
.fact:first-child{ border-left:none; padding-left:0; }
.fact-label{ display:block; font-size:12px; color:var(--ink-faint); margin-bottom:8px; }
.fact-value{ font-family:var(--font-display); font-size:16px; font-weight:500; }

/* Skills */
.skills-grid{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  overflow:hidden;
}
.skill-card{ background:var(--bg); padding:26px 24px; }
.skill-card-wide{ grid-column:span 2; }
.skill-cat{ font-size:12.5px; color:var(--accent-ink); margin:0 0 16px; }
.skill-tags{ display:flex; flex-wrap:wrap; gap:8px; }
.skill-tags li{
  font-size:13.5px;
  padding:6px 12px;
  border:1px solid var(--line-strong);
  border-radius:100px;
  color:var(--ink-soft);
}

/* Projects */
.filter-bar{ display:flex; gap:10px; margin-bottom:36px; flex-wrap:wrap; }
.filter-btn{
  background:transparent;
  border:1px solid var(--line-strong);
  color:var(--ink-soft);
  padding:8px 16px;
  border-radius:100px;
  font-size:13.5px;
  cursor:pointer;
  transition:all .15s var(--ease);
}
.filter-btn:hover{ border-color:var(--ink); color:var(--ink); }
.filter-btn.is-active{ background:var(--ink); color:#fff; border-color:var(--ink); }

.project-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:22px;
}
.project-card{
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  padding:28px;
  transition:border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
  display:flex; flex-direction:column;
}
.project-card:hover{
  border-color:var(--line-strong);
  transform:translateY(-3px);
  box-shadow:0 12px 28px -18px rgba(20,22,26,.28);
}
.project-card.is-hidden{ display:none; }
.project-top{ display:flex; justify-content:space-between; align-items:center; margin-bottom:14px; }
.project-tag{ font-size:11.5px; color:var(--accent-ink); background:var(--accent-soft); padding:4px 10px; border-radius:100px; }
.project-date{ font-size:11.5px; color:var(--ink-faint); }
.project-name{ font-family:var(--font-display); font-size:20px; font-weight:600; margin:0 0 10px; }
.project-desc{ color:var(--ink-soft); font-size:14.5px; margin:0 0 14px; }
.project-features{ margin:0 0 16px; padding-left:18px; }
.project-features li{ list-style:disc; font-size:13.5px; color:var(--ink-soft); margin-bottom:4px; }
.project-stack{ font-size:12px; color:var(--ink-faint); margin-bottom:18px; margin-top:auto; }
.project-links{ display:flex; gap:18px; }
.project-links a{ font-size:14px; font-weight:500; color:var(--ink); }
.project-links a:hover{ color:var(--accent); }
.projects-more{ margin-top:32px; font-size:13px; color:var(--ink-faint); }
.projects-more a{ color:var(--ink-soft); text-decoration:underline; text-underline-offset:3px; }

/* Journey timeline */
.timeline{ border-left:1px solid var(--line-strong); }
.timeline-item{ padding:0 0 40px 28px; position:relative; }
.timeline-item:last-child{ padding-bottom:0; }
.timeline-item::before{
  content:'';
  position:absolute; left:-5px; top:4px;
  width:9px; height:9px; border-radius:50%;
  background:var(--bg); border:2px solid var(--accent);
}
.timeline-marker{ font-size:12px; color:var(--accent-ink); display:block; margin-bottom:6px; }
.timeline-title{ font-family:var(--font-display); font-size:19px; font-weight:600; margin:0 0 8px; }
.timeline-desc{ color:var(--ink-soft); font-size:14.5px; max-width:60ch; margin:0; }

/* Certifications */
.cert-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; margin-bottom:20px; }
.cert-card{
  border:1px solid var(--line); border-radius:var(--radius-m);
  padding:24px; display:flex; gap:16px; align-items:center;
}
.cert-icon{
  width:44px; height:44px; flex-shrink:0;
  border-radius:var(--radius-s);
  background:var(--accent-soft); color:var(--accent-ink);
  display:flex; align-items:center; justify-content:center;
  font-size:13px; font-weight:600;
}
.cert-title{ font-family:var(--font-display); font-size:15.5px; font-weight:600; margin:0 0 4px; }
.cert-org{ font-size:13.5px; color:var(--ink-soft); margin:0; }
.cert-note{ font-size:12.5px; color:var(--ink-faint); }

/* GitHub stats */
.gh-stats{ display:flex; gap:64px; margin-bottom:36px; flex-wrap:wrap; }
.gh-stat{ display:flex; flex-direction:column; gap:8px; }
.gh-num{ font-family:var(--font-display); font-size:44px; font-weight:600; letter-spacing:-.02em; }
.gh-label{ font-size:12.5px; color:var(--ink-faint); }

/* Dashboard */
.dash-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; margin-bottom:40px; }
.dash-card{ border:1px solid var(--line); border-radius:var(--radius-m); padding:22px; }
.dash-label{ font-size:12px; color:var(--ink-faint); display:block; margin-bottom:14px; }
.dash-value{ font-family:var(--font-display); font-size:32px; font-weight:600; display:block; margin-bottom:14px; }
.dash-bar{ height:4px; background:var(--line); border-radius:4px; overflow:hidden; }
.dash-bar span{ display:block; height:100%; background:var(--accent); border-radius:4px; }

.dash-row{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:var(--radius-m); overflow:hidden; }
.dash-mini{ background:var(--bg); padding:22px; }
.dash-mini-label{ font-size:11.5px; color:var(--ink-faint); display:block; margin-bottom:8px; }
.dash-mini-value{ font-family:var(--font-display); font-size:15px; font-weight:500; }

/* Architecture showcase */
.arch-diagram{
  display:flex; align-items:center; gap:8px; flex-wrap:wrap;
  margin-bottom:32px;
}
.arch-node{
  background:var(--bg); border:1px solid var(--line-strong); color:var(--ink);
  padding:12px 18px; border-radius:var(--radius-s);
  font-family:var(--font-mono); font-size:13px;
  cursor:pointer;
  transition:all .15s var(--ease);
}
.arch-node:hover{ border-color:var(--accent); color:var(--accent-ink); }
.arch-node.is-active{ background:var(--ink); border-color:var(--ink); color:#fff; }
.arch-arrow{ color:var(--ink-faint); font-size:14px; }
.arch-detail{
  border:1px solid var(--line); border-radius:var(--radius-m);
  padding:26px 28px; background:var(--bg);
  min-height:96px;
}
.arch-detail-key{ font-size:12.5px; color:var(--accent-ink); margin:0 0 8px; }
.arch-detail-text{ color:var(--ink-soft); margin:0; max-width:64ch; font-size:15px; }

/* Contact */
.contact-grid{ display:grid; grid-template-columns:.9fr 1.1fr; gap:64px; }
.contact-list{ display:flex; flex-direction:column; gap:12px; margin-top:8px; }
.contact-list a{ color:var(--ink-soft); font-size:14.5px; }
.contact-list a:hover{ color:var(--accent); }

.contact-form{ border:1px solid var(--line); border-radius:var(--radius-m); padding:32px; }
.form-row{ margin-bottom:20px; display:flex; flex-direction:column; gap:8px; }
.form-row label{ font-size:13px; color:var(--ink-soft); }
.form-row input, .form-row textarea{
  font:inherit; font-size:14.5px;
  padding:11px 14px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-s);
  background:var(--bg);
  color:var(--ink);
  resize:vertical;
  transition:border-color .15s var(--ease);
}
.form-row input:focus, .form-row textarea:focus{ border-color:var(--accent); }
.form-row.has-error input, .form-row.has-error textarea{ border-color:#D14343; }
.form-error{ font-size:12px; color:#D14343; min-height:14px; }
.form-hp{ position:absolute; left:-9999px; width:1px; height:1px; overflow:hidden; }
.form-status{ font-size:13.5px; margin:14px 0 0; min-height:18px; }
.form-status.is-success{ color:#1F7A4D; }
.form-status.is-error{ color:#D14343; }
.form-note{ font-size:11.5px; color:var(--ink-faint); margin:10px 0 0; }

/* Footer */
.site-footer{ border-top:1px solid var(--line); padding:32px 0; }
.footer-grid{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px; }
.footer-grid .mono{ font-size:12.5px; color:var(--ink-faint); }
.footer-links{ display:flex; gap:22px; }
.footer-links a{ font-size:13px; color:var(--ink-soft); }
.footer-links a:hover{ color:var(--accent); }

/* =========================================================
   Reveal on scroll
========================================================= */
.reveal{ opacity:0; transform:translateY(16px); transition:opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.is-visible{ opacity:1; transform:translateY(0); }

/* =========================================================
   Responsive
========================================================= */
@media (max-width: 980px){
  .about-grid, .contact-grid{ grid-template-columns:1fr; gap:32px; }
  .skills-grid{ grid-template-columns:repeat(2,1fr); }
  .skill-card-wide{ grid-column:span 2; }
  .dash-grid{ grid-template-columns:repeat(2,1fr); }
  .dash-row{ grid-template-columns:1fr; }
  .cert-grid{ grid-template-columns:1fr; }
  .project-grid{ grid-template-columns:1fr; }
  .hero-grid{ grid-template-columns:1fr; }
  .hero-visual{ order:-1; }
  .portrait{ width:220px; margin:0 auto; }
}

@media (max-width: 720px){
  .nav-links{
    position:fixed; top:64px; left:0; right:0;
    background:var(--bg);
    flex-direction:column;
    align-items:flex-start;
    padding:20px 28px 28px;
    border-bottom:1px solid var(--line);
    gap:4px;
    transform:translateY(-8px);
    opacity:0;
    pointer-events:none;
    transition:opacity .2s var(--ease), transform .2s var(--ease);
  }
  .nav-links.is-open{ opacity:1; transform:translateY(0); pointer-events:auto; }
  .nav-links li{ width:100%; }
  .nav-links a{ display:block; padding:12px 0; font-size:16px; border-bottom:1px solid var(--line); }
  .menu-toggle{ display:flex; }

  .about-facts{ grid-template-columns:repeat(2,1fr); row-gap:24px; }
  .fact:nth-child(2){ border-left:1px solid var(--line); }
  .fact:nth-child(3){ border-left:none; padding-left:0; }

  .skills-grid{ grid-template-columns:1fr; }
  .skill-card-wide{ grid-column:span 1; }

  .section{ padding:64px 0; }
  .hero{ padding:44px 0 28px; }
  .pipeline{ justify-content:flex-start; }

  .cert-grid{ grid-template-columns:1fr; }
  .gh-stats{ gap:36px; }
  .arch-diagram{ gap:6px; }
  .arch-node{ padding:10px 12px; font-size:12px; }
}






/* Success State Card */
.form-success-card {
  text-align: center;
  padding: 3rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.success-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.form-success-card h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--fg, #111);
}

.form-success-card p {
  color: #666;
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  max-width: 320px;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}