/* ─── VARIABLES ───────────────────────────────────────────── */
:root {
  --navy:        #0a192f;
  --navy-alt:    #112240;
  --teal:        #64ffda;
  --teal-dim:    rgba(100, 255, 218, 0.08);
  --accent:      #0d9488;
  --accent-h:    #0f766e;
  --text:        #1e293b;
  --muted:       #64748b;
  --bg:          #ffffff;
  --bg-alt:      #f8fafc;
  --border:      #e2e8f0;
  --shadow:      0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-h:    0 8px 32px rgba(0,0,0,.13);
  --r:           12px;
  --nav-h:       64px;
  --font:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ease:        .2s ease;
}

/* ─── RESET ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img  { max-width: 100%; display: block; }
a    { text-decoration: none; color: inherit; }
ul   { list-style: none; }
button { font-family: var(--font); }

/* ─── SCROLLBAR ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--navy); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ─── NAV ─────────────────────────────────────────────────── */
#nav {
  position: fixed; top: 0; width: 100%; z-index: 100;
  height: var(--nav-h);
  transition: background var(--ease), box-shadow var(--ease);
}
#nav.scrolled {
  background: rgba(10, 25, 47, .96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,.07);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: 100%;
}
.nav-logo {
  font-size: 1.05rem; font-weight: 700;
  color: var(--teal); letter-spacing: -.01em;
  transition: opacity var(--ease);
}
.nav-logo:hover { opacity: .8; }
#nav ul { display: flex; gap: 4px; }
#nav ul li a {
  color: rgba(204, 214, 246, .8);
  font-size: .88rem; font-weight: 500;
  padding: 8px 16px; border-radius: 6px;
  transition: color var(--ease), background var(--ease);
}
#nav ul li a:hover { color: var(--teal); background: var(--teal-dim); }
.burger {
  display: none; background: none; border: none;
  cursor: pointer; color: rgba(204,214,246,.9);
  width: 36px; height: 36px;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.burger span {
  display: block; width: 22px; height: 2px;
  background: currentColor; border-radius: 2px;
  transition: transform var(--ease), opacity var(--ease);
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── HERO ────────────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  background: var(--navy);
  display: flex; align-items: center; justify-content: center;
  padding: calc(var(--nav-h) + 48px) 28px 96px;
  position: relative; overflow: hidden;
  text-align: center;
}
#hero::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 15% 60%, rgba(100,255,218,.07) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 20%, rgba(13,148,136,.09) 0%, transparent 55%);
}
/* subtle dot grid */
#hero::after {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(rgba(100,255,218,.08) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
.hero-content { position: relative; max-width: 700px; width: 100%; }

.hero-photo {
  width: 280px; height: 280px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 24px;
  border: 3px solid rgba(100,255,218,.35);
  box-shadow: 0 0 0 6px rgba(100,255,218,.08);
}
.hero-name {
  font-size: clamp(2rem, 7vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: #e6f1ff;
  margin-bottom: 12px;
}
.hero-tag {
  display: inline-block;
  font-size: .78rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--teal); margin-bottom: 24px;
}
.hero-content h1 {
  font-size: clamp(3.2rem, 9vw, 6.5rem);
  font-weight: 800; line-height: 1.05;
  letter-spacing: -.03em;
  color: #e6f1ff; margin-bottom: 28px;
}
.hero-bio {
  font-size: 1.08rem; line-height: 1.75;
  color: rgba(204,214,246,.78);
  max-width: 560px; margin: 0 auto 40px;
}
.hero-socials {
  display: flex; flex-wrap: wrap; gap: 10px;
  justify-content: center; margin-bottom: 44px;
}
.hero-socials a {
  color: rgba(204,214,246,.75);
  font-size: .88rem; font-weight: 500;
  padding: 8px 22px;
  border: 1px solid rgba(100,255,218,.22);
  border-radius: 40px;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.hero-socials a:hover { color: var(--teal); border-color: var(--teal); background: var(--teal-dim); }
.cta-btn {
  display: inline-block;
  color: var(--teal); font-size: .9rem; font-weight: 600;
  padding: 13px 36px;
  border: 1.5px solid var(--teal);
  border-radius: 6px;
  transition: background var(--ease);
  letter-spacing: .02em;
}
.cta-btn:hover { background: var(--teal-dim); }

/* ─── SECTION SHARED ──────────────────────────────────────── */
section { padding: 100px 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header h2 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 800; letter-spacing: -.025em;
  color: var(--text); display: inline-block; position: relative;
}
.section-header h2::after {
  content: '';
  position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%);
  width: 44px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--teal));
}
.section-header p {
  color: var(--muted); font-size: 1.05rem; margin-top: 24px;
}

/* ─── PROJECTS ────────────────────────────────────────────── */
#projects { background: var(--bg-alt); }
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 28px;
}
.project-card {
  background: var(--bg);
  border-radius: var(--r); overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer; display: flex; flex-direction: column;
  transition: transform var(--ease), box-shadow var(--ease);
  border: 1px solid transparent;
}
.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-h);
  border-color: var(--border);
}
.card-img {
  aspect-ratio: 16/9; overflow: hidden;
  background: var(--bg-alt); position: relative;
}
.card-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
}
.card-img--contain img { object-fit: contain; }
.project-card:hover .card-img img { transform: scale(1.05); }
.card-body { padding: 22px 24px; flex: 1; display: flex; flex-direction: column; }
.card-cat {
  font-size: .72rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 8px;
}
.card-body h3 {
  font-size: 1.05rem; font-weight: 700;
  color: var(--text); line-height: 1.35; margin-bottom: 10px;
}
.card-desc {
  font-size: .88rem; color: var(--muted);
  line-height: 1.65; flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-footer {
  padding: 14px 24px 20px;
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  flex-wrap: wrap;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 5px; }
.tag {
  font-size: .7rem; font-weight: 500;
  background: var(--bg-alt); color: var(--muted);
  padding: 3px 9px; border-radius: 4px;
  border: 1px solid var(--border);
}
.read-more {
  font-size: .82rem; font-weight: 700;
  color: var(--accent); white-space: nowrap;
  transition: color var(--ease);
  align-self: flex-end;
}
.project-card:hover .read-more { color: var(--accent-h); }

/* ─── EDUCATION ───────────────────────────────────────────── */
#education { background: var(--bg); }
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.edu-card {
  background: var(--bg-alt);
  border-radius: var(--r); padding: 28px 28px 24px;
  border: 1px solid var(--border);
  transition: box-shadow var(--ease), transform var(--ease);
}
.edu-card:hover { box-shadow: var(--shadow-h); transform: translateY(-3px); }
.edu-year {
  font-size: .75rem; font-weight: 700;
  letter-spacing: .07em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
.edu-card h3 {
  font-size: 1.05rem; font-weight: 700;
  color: var(--text); line-height: 1.3; margin-bottom: 4px;
}
.edu-inst { font-size: .9rem; color: var(--muted); margin-bottom: 14px; }
.edu-thesis {
  font-size: .84rem; color: var(--muted);
  font-style: italic; line-height: 1.55; margin-bottom: 16px;
}
.edu-tags { display: flex; flex-wrap: wrap; gap: 6px; }

/* ─── EXPERIENCE ──────────────────────────────────────────── */
#experience { background: var(--bg-alt); }
.timeline { max-width: 820px; margin: 0 auto; }
.tl-item { display: flex; gap: 24px; padding-bottom: 48px; position: relative; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item:not(:last-child)::before {
  content: '';
  position: absolute; left: 11px; top: 26px;
  width: 2px; height: calc(100% - 14px);
  background: var(--border);
}
.tl-dot {
  width: 24px; height: 24px; min-width: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #22d3ee);
  margin-top: 2px; position: relative; z-index: 1;
  box-shadow: 0 0 0 4px rgba(13,148,136,.15);
}
.tl-body { flex: 1; }
.tl-date {
  font-size: .76rem; font-weight: 700;
  letter-spacing: .07em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 6px;
}
.tl-body h3 { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.tl-company { font-size: .92rem; color: var(--muted); margin-bottom: 14px; }
.tl-body ul {
  padding-left: 18px; list-style: disc;
  font-size: .89rem; color: var(--muted); line-height: 1.7;
}
.tl-body ul li + li { margin-top: 4px; }

/* ─── CONTACT ─────────────────────────────────────────────── */
#contact {
  background: var(--navy);
  text-align: center; padding: 100px 28px;
}
#contact h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800; letter-spacing: -.025em;
  color: #e6f1ff; margin-bottom: 16px;
}
#contact .sub {
  color: rgba(204,214,246,.65); font-size: 1.05rem; margin-bottom: 36px;
}
.email-pill {
  display: inline-block;
  color: var(--teal); font-size: 1.05rem; font-weight: 600;
  padding: 13px 36px;
  border: 1.5px solid rgba(100,255,218,.35);
  border-radius: 8px; margin-bottom: 52px;
  transition: background var(--ease), border-color var(--ease);
}
.email-pill:hover { background: var(--teal-dim); border-color: var(--teal); }
.contact-icons {
  display: flex; flex-wrap: wrap; gap: 20px;
  justify-content: center; align-items: center;
}
.contact-icons a {
  display: flex; align-items: center; gap: 8px;
  color: rgba(204,214,246,.6);
  font-size: .9rem; font-weight: 500;
  transition: color var(--ease);
}
.contact-icons a:hover { color: var(--teal); }
.contact-icons .sep {
  color: rgba(204,214,246,.2); font-size: 1.2rem;
}

/* ─── FOOTER ──────────────────────────────────────────────── */
footer {
  background: #060d1a;
  text-align: center; padding: 24px;
  color: rgba(204,214,246,.35); font-size: .83rem;
}

/* ─── MODAL ───────────────────────────────────────────────── */
.overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(6, 13, 26, .85);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  display: none; align-items: flex-start; justify-content: center;
  padding: 40px 20px; overflow-y: auto;
}
.overlay.open { display: flex; }
.modal {
  background: var(--bg); border-radius: var(--r);
  max-width: 800px; width: 100%;
  position: relative; overflow: hidden;
  animation: pop-in .25s ease;
  margin: auto;
}
@keyframes pop-in {
  from { opacity: 0; transform: translateY(24px) scale(.97); }
  to   { opacity: 1; transform: none; }
}
.modal-close {
  position: absolute; top: 14px; right: 14px;
  background: var(--bg-alt); border: 1px solid var(--border);
  cursor: pointer; width: 34px; height: 34px;
  border-radius: 50%; font-size: 1rem; color: var(--muted);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--ease); z-index: 10;
}
.modal-close:hover { background: var(--border); }
.modal-hero { aspect-ratio: 16/9; overflow: hidden; background: var(--bg-alt); }
.modal-hero img { width: 100%; height: 100%; object-fit: cover; }
.modal-hero--contain img { object-fit: contain; }
.modal-hero--tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 0; aspect-ratio: 4/3; }
.modal-hero--tiles img { width: 100%; height: 100%; object-fit: cover; display: block; }
.modal-bd { padding: 32px; }
.modal-cat {
  font-size: .72rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.modal-bd h2 {
  font-size: 1.55rem; font-weight: 800;
  color: var(--text); line-height: 1.25; margin-bottom: 22px;
  letter-spacing: -.015em;
}
.modal-text {
  font-size: .93rem; color: var(--muted);
  line-height: 1.78; white-space: pre-line;
}
.modal-text p + p { margin-top: 14px; }
.modal-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 28px; }
.modal-tags .tag { font-size: .78rem; padding: 4px 11px; }
.modal-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.modal-link {
  display: inline-block;
  font-size: .88rem; font-weight: 600;
  color: var(--accent);
  padding: 8px 20px;
  border: 1.5px solid var(--accent);
  border-radius: 6px;
  transition: background var(--ease), color var(--ease);
}
.modal-link:hover { background: var(--accent); color: #fff; }

/* ─── FADE-UP ANIMATION ───────────────────────────────────── */
.fu {
  opacity: 0; transform: translateY(28px);
  transition: opacity .6s ease, transform .6s ease;
}
.fu.vis { opacity: 1; transform: none; }

/* ─── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 768px) {
  #nav ul { display: none; flex-direction: column; gap: 2px; }
  #nav ul.open {
    display: flex; position: absolute;
    top: var(--nav-h); left: 0; width: 100%;
    background: rgba(10,25,47,.97);
    padding: 16px 20px 24px; border-top: 1px solid rgba(255,255,255,.07);
  }
  #nav ul.open li a { display: block; padding: 11px 16px; }
  .burger { display: flex; }
  .projects-grid { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
  section { padding: 72px 0; }
  .modal-bd { padding: 22px; }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 2.8rem; }
  #contact { padding: 72px 20px; }
}