/* ── Reset & Base ───────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --blue:    #0070C0;
  --blue-lt: #E8F2FB;
  --blue-dk: #005A9E;
  --gold:    #B8860B;
  --gold-lt: #FDF6E3;
  --dark:    #0F172A;
  --body:    #334155;
  --muted:   #64748B;
  --border:  #E2E8F0;
  --bg:      #F8FAFC;
  --card:    #FFFFFF;
  --radius:  12px;
  --shadow:  0 1px 3px rgba(15,23,42,.06), 0 4px 16px rgba(15,23,42,.06);
  --shadow-hover: 0 4px 8px rgba(15,23,42,.08), 0 12px 32px rgba(0,112,192,.12);
}
/* ── Justify long-form text ──────────────────── */
.about-card,
.exp-bullets li,
.project-desc,
.pub-desc {
  text-align: justify;
  hyphens: auto;
  text-wrap: pretty;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--body);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

/* ── Nav ───────────────────────────────────── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 5%;
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.nav-name { font-weight: 700; font-size: 15px; color: var(--dark); letter-spacing: -.3px; }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { font-size: 13px; font-weight: 500; color: var(--muted); transition: color .2s; }
.nav-links a:hover { color: var(--blue); text-decoration: none; }

/* ── Hero ──────────────────────────────────── */
.hero {
  background: linear-gradient(150deg, #07111F 0%, #0D2137 45%, #0A3255 75%, #0070C0 100%);
  color: white;
  padding: 80px 5% 72px;
  position: relative;
  overflow: hidden;
}
/* Circuit board trace pattern */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  opacity: .18;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cg stroke='%2360B4FF' stroke-width='0.8' fill='none'%3E%3Cpath d='M0 40 H55 V15 H95 V40 H140'/%3E%3Cpath d='M60 0 V15'/%3E%3Cpath d='M140 40 H160 V70 H200'/%3E%3Cpath d='M0 100 H30 V80 H80 V100 H120 V120 H160 V100 H200'/%3E%3Cpath d='M80 80 V60 H110 V0'/%3E%3Cpath d='M30 100 V140 H0'/%3E%3Cpath d='M120 120 V160 H80 V200'/%3E%3Cpath d='M160 100 V80 H200'/%3E%3Cpath d='M0 160 H50 V180 H100 V160 H130 V200'/%3E%3Cpath d='M100 180 H160 V160 H200'/%3E%3C/g%3E%3Ccircle cx='55' cy='40' r='2.5' fill='%2360B4FF' opacity='.6'/%3E%3Ccircle cx='95' cy='40' r='2.5' fill='%2360B4FF' opacity='.6'/%3E%3Ccircle cx='80' cy='100' r='2.5' fill='%2360B4FF' opacity='.6'/%3E%3Ccircle cx='120' cy='100' r='2' fill='%2360B4FF' opacity='.5'/%3E%3Ccircle cx='30' cy='100' r='2' fill='%2360B4FF' opacity='.5'/%3E%3Ccircle cx='160' cy='100' r='2' fill='%2360B4FF' opacity='.5'/%3E%3Ccircle cx='80' cy='80' r='2' fill='%2360B4FF' opacity='.4'/%3E%3Ccircle cx='110' cy='60' r='1.5' fill='%2360B4FF' opacity='.4'/%3E%3Ccircle cx='100' cy='180' r='2' fill='%2360B4FF' opacity='.5'/%3E%3Ccircle cx='50' cy='180' r='1.5' fill='%2360B4FF' opacity='.4'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}
/* Subtle radial glow on right */
.hero::after {
  content: '';
  position: absolute;
  right: -100px; top: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,112,192,.25) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner { max-width: 860px; position: relative; }
.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 20px;
  color: rgba(255,255,255,.9);
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.1;
  margin-bottom: 12px;
  color: #fff;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 400;
  color: rgba(255,255,255,.75);
  margin-bottom: 28px;
  max-width: 600px;
  line-height: 1.5;
}
.hero-links {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-bottom: 48px;
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 13px; font-weight: 600;
  transition: all .2s;
  cursor: pointer;
}
.btn-white {
  background: white; color: var(--dark);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.btn-white:hover { background: #F1F5F9; text-decoration: none; transform: translateY(-1px); }
.btn-outline {
  background: rgba(255,255,255,.1);
  color: white;
  border: 1px solid rgba(255,255,255,.25);
}
.btn-outline:hover { background: rgba(255,255,255,.18); text-decoration: none; }
.hero-stats {
  display: flex; flex-wrap: wrap; gap: 16px;
}
.stat-card {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 10px;
  padding: 16px 24px;
  text-align: center;
  min-width: 120px;
}
.stat-num {
  font-size: 26px; font-weight: 800;
  color: #fff; line-height: 1;
  margin-bottom: 4px;
}
.stat-num span { color: #60B4FF; }
.stat-label { font-size: 11px; font-weight: 500; color: rgba(255,255,255,.65); text-transform: uppercase; letter-spacing: .5px; }

/* ── Section Wrapper ───────────────────────── */
section { padding: 64px 5%; }
section:nth-child(even) { background: white; }
.section-header { margin-bottom: 36px; }
.section-tag {
  display: inline-block;
  background: var(--blue-lt);
  color: var(--blue);
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  padding: 3px 10px; border-radius: 4px;
  margin-bottom: 8px;
}
.section-header h2 {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700; color: var(--dark);
  letter-spacing: -.5px;
}

/* ── Hero credibility line ─────────────────── */
.hero-credibility {
  font-size: 13px;
  color: rgba(255,255,255,.5);
  margin-top: -16px;
  margin-bottom: 24px;
  font-weight: 400;
  letter-spacing: .2px;
}

/* ── About ─────────────────────────────────── */
.about-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow);
  font-size: 15.5px; line-height: 1.8;
  color: var(--body);
}

/* ── What I Do cards ──────────────────────── */
.whatido-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}
.whatido-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
}
.whatido-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.whatido-icon {
  width: 40px; height: 40px;
  background: var(--blue-lt);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px;
  color: var(--blue);
}
.whatido-title { font-size: 14px; font-weight: 700; color: var(--dark); margin-bottom: 5px; }
.whatido-desc { font-size: 12.5px; color: var(--muted); line-height: 1.55; }

/* ── Impact badges on experience cards ─────── */
.impact-badges {
  display: flex; flex-wrap: wrap; gap: 7px;
  margin-bottom: 14px;
}
.impact-badge {
  background: var(--blue-lt);
  border: 1px solid #B9D9F5;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 11.5px; font-weight: 600;
  color: var(--blue-dk);
}

/* ── Skills ────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
}
.skill-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.skill-card-title {
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .8px;
  color: var(--blue); margin-bottom: 12px;
  display: flex; align-items: center; gap: 8px;
}
.skill-card-title .icon {
  width: 28px; height: 28px;
  background: var(--blue-lt);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 9px;
  font-size: 12px; font-weight: 500;
  color: var(--body);
}
.tag-blue { background: var(--blue-lt); border-color: #B9D9F5; color: var(--blue-dk); }

/* ── Experience Timeline ───────────────────── */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: '';
  position: absolute; left: 6px; top: 8px; bottom: 0;
  width: 2px; background: var(--border);
}
.exp-item { position: relative; margin-bottom: 36px; }
.exp-item::before {
  content: '';
  position: absolute; left: -25px; top: 12px;
  width: 12px; height: 12px;
  background: var(--blue);
  border: 2px solid white;
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--blue-lt);
}
.exp-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s;
}
.exp-card:hover { box-shadow: var(--shadow-hover); }
.exp-header {
  display: flex; flex-wrap: wrap;
  justify-content: space-between; align-items: flex-start;
  gap: 8px; margin-bottom: 4px;
}
.exp-role { font-size: 16px; font-weight: 700; color: var(--dark); }
.exp-date {
  font-size: 12px; font-weight: 500;
  color: white; background: var(--blue);
  padding: 2px 10px; border-radius: 20px;
  white-space: nowrap;
}
.exp-date.current { background: #059669; }
.exp-company { font-size: 13px; font-weight: 500; color: var(--muted); margin-bottom: 14px; }
.exp-company em { color: var(--blue); font-style: normal; }
.exp-bullets { list-style: none; padding: 0; }
.exp-bullets li {
  position: relative; padding-left: 16px;
  font-size: 13.5px; color: var(--body);
  margin-bottom: 7px; line-height: 1.6;
}
.exp-bullets li::before {
  content: '▸';
  position: absolute; left: 0;
  color: var(--blue); font-size: 11px; top: 2px;
}
.exp-client {
  display: inline-block;
  background: #F0FDF4; border: 1px solid #BBF7D0;
  border-radius: 4px; padding: 2px 8px;
  font-size: 12px; font-weight: 600; color: #15803D;
  margin-bottom: 10px;
}
.exp-divider { border: none; border-top: 1px dashed var(--border); margin: 14px 0; }
.career-break {
  background: var(--gold-lt);
  border: 1px solid #EDD68A;
  border-left: 4px solid var(--gold);
}
.career-break .exp-role { color: var(--gold); }
.career-break .exp-date { background: var(--gold); }

/* ── Projects ──────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
  display: flex; flex-direction: column;
}
.project-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.project-title { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.project-desc { font-size: 13.5px; color: var(--body); line-height: 1.65; flex: 1; margin-bottom: 14px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.project-tags .tag { font-size: 11px; }

/* ── Certs ─────────────────────────────────── */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.cert-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
  display: flex; align-items: flex-start; gap: 14px;
  transition: box-shadow .2s, transform .2s;
}
.cert-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.cert-icon {
  width: 38px; height: 38px; border-radius: 8px;
  background: var(--blue-lt);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.cert-name { font-size: 13.5px; font-weight: 600; color: var(--dark); margin-bottom: 3px; }
.cert-issuer { font-size: 12px; color: var(--muted); }
.cert-link { font-size: 11px; color: var(--blue); font-weight: 500; }

/* ── Education ─────────────────────────────── */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}
.edu-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}
.edu-degree { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.edu-uni { font-size: 13px; font-weight: 500; color: var(--muted); margin-bottom: 10px; }
.gold-badge {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--gold-lt); border: 1px solid #EDD68A;
  color: var(--gold); border-radius: 6px;
  padding: 4px 10px; font-size: 12px; font-weight: 700;
}

/* ── Publications ──────────────────────────── */
.pub-list { display: flex; flex-direction: column; gap: 14px; }
.pub-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 18px 22px;
  box-shadow: var(--shadow);
}
.pub-title { font-size: 14px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.pub-meta { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.pub-desc { font-size: 13px; color: var(--body); }

/* ── Achievements ──────────────────────────── */
.achieve-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.achieve-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  text-align: center;
}
.achieve-icon { font-size: 28px; margin-bottom: 8px; }
.achieve-title { font-size: 13.5px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.achieve-sub { font-size: 12px; color: var(--muted); }

/* ── Contact ───────────────────────────────── */
.contact-section {
  background: linear-gradient(135deg, #0F172A 0%, #1E3A5F 100%);
  color: white; text-align: center;
}
.contact-section h2 { color: white; }
.contact-section .section-tag { background: rgba(255,255,255,.1); color: rgba(255,255,255,.8); }
.contact-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; }
.contact-email {
  font-size: 18px; font-weight: 300; color: rgba(255,255,255,.75);
  margin: 12px 0 4px; letter-spacing: .3px;
}
.contact-loc { font-size: 13px; color: rgba(255,255,255,.5); margin-bottom: 4px; }

/* ── Footer ────────────────────────────────── */
footer {
  background: #0F172A;
  color: rgba(255,255,255,.4);
  text-align: center;
  font-size: 12px;
  padding: 18px 5%;
}

/* ── Responsive ────────────────────────────── */
@media (max-width: 640px) {
  nav { padding: 0 4%; }
  .nav-links { display: none; }
  section { padding: 48px 4%; }
  .hero { padding: 56px 4% 52px; }
  .hero-stats { gap: 10px; }
  .stat-card { padding: 12px 16px; min-width: 90px; }
}

/* ── Scroll Progress Bar ───────────────────── */
#scroll-progress {
  position: fixed; top: 0; left: 0; z-index: 200;
  height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--blue), #60B4FF);
  transition: width .1s linear;
}

/* ── Nav scrolled state ────────────────────── */
nav.scrolled {
  box-shadow: 0 2px 16px rgba(15,23,42,.1);
}
nav .nav-cta {
  display: inline-flex; align-items: center;
  background: var(--blue); color: white;
  padding: 6px 14px; border-radius: 6px;
  font-size: 12px; font-weight: 600;
  transition: background .2s;
}
nav .nav-cta:hover { background: var(--blue-dk); text-decoration: none; }

/* ── Scroll Animations ─────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .55s ease, transform .55s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up.delay-1 { transition-delay: .1s; }
.fade-up.delay-2 { transition-delay: .2s; }
.fade-up.delay-3 { transition-delay: .3s; }
.fade-up.delay-4 { transition-delay: .4s; }
.fade-up.delay-5 { transition-delay: .5s; }
.fade-up.delay-6 { transition-delay: .6s; }

/* ── Mobile nav hamburger ──────────────────── */
.nav-menu-btn {
  display: none;
  background: none; border: none; cursor: pointer;
  padding: 6px; color: var(--dark); line-height: 0;
}
@media (max-width: 640px) {
  .nav-menu-btn { display: flex; align-items: center; }
  .nav-links {
    display: none;
    position: fixed; top: 56px; left: 0; right: 0; z-index: 99;
    flex-direction: column; gap: 0;
    background: white;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(15,23,42,.1);
    padding: 4px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block; padding: 13px 5%;
    font-size: 15px; color: var(--body);
    border-bottom: 1px solid var(--border);
  }
  .nav-links li:last-child a { border-bottom: none; }
  .nav-links a.nav-cta {
    background: none; color: var(--blue);
    border-radius: 0; padding: 13px 5%;
  }
}

/* ── Section divider wave ──────────────────── */
.wave-divider {
  line-height: 0; overflow: hidden;
  background: var(--bg);
}
.wave-divider.white { background: white; }
.wave-divider svg { display: block; width: 100%; }

@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

/* ── Stat counter ──────────────────────────── */
.stat-num { transition: color .3s; }