:root {
  --bg: #0B0F13;
  --surface: #12171C;
  --surface-2: #171D23;
  --border: #223038;
  --border-strong: #2C5F82;
  --text: #EDF1F3;
  --text-secondary: #93A1AA;
  --text-muted: #5C6B74;
  --blue: #3B82C4;
  --blue-dim: #2C5F82;
  --amber: #F2A93B;
  --green: #4FA973;
  --blueprint-bg: #E9EEF3;
  --blueprint-grid: #C7D4DE;
  --blueprint-ink: #132C45;
  --blueprint-ink-2: #3D5A75;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* ── Skip link ─────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.5rem 1rem;
  background: var(--blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border-radius: 0 0 4px 4px;
  text-decoration: none;
  transition: top 0.1s;
}
.skip-link:focus { top: 0; }

/* ── Keyboard focus rings ──────────────────────────────── */
:focus { outline: none; }

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

.nav a:focus-visible,
.nav-mark:focus-visible,
.nav-status:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
  border-radius: 3px;
}

.tb-link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-radius: 2px;
  text-decoration-color: var(--blue);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.4); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes drawIn {
  to { stroke-dashoffset: 0; }
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.7, 0.3, 1), transform 0.7s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

body {
  margin: 0;
  background-color: var(--bg);
  background-image: radial-gradient(circle, rgba(59, 130, 196, 0.14) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

h1, h2, h3 { font-family: var(--font-display); margin: 0; font-weight: 500; }

a { color: inherit; text-decoration: none; }

section, header, footer { padding: 0 6vw; }

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 6vw;
  background: rgba(11, 15, 19, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 0.5px solid transparent;
  transition: border-color 0.3s ease, padding 0.3s ease;
}
.nav.scrolled {
  border-bottom-color: var(--border);
  padding: 12px 6vw;
}
.nav-mark {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.05em;
}
.nav-links { display: flex; gap: 28px; }

/* ── Hamburger ─────────────────────────────────────────── */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-burger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease, background 0.2s ease;
}
.nav-burger:hover span { background: var(--text); }
.nav.open .nav-burger span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav.open .nav-burger span:nth-child(2) { opacity: 0; }
.nav.open .nav-burger span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
.nav-links a {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  border: 0.5px solid var(--border-strong);
  border-radius: 20px;
  padding: 6px 12px;
  white-space: nowrap;
}
.nav-status .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(79,169,115,0.6);
  animation: pulse-dot 2.4s infinite;
}
@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(79,169,115,0.5); }
  70% { box-shadow: 0 0 0 6px rgba(79,169,115,0); }
  100% { box-shadow: 0 0 0 0 rgba(79,169,115,0); }
}

/* HERO */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 82vh;
  padding-top: 6vh;
  position: relative;
  overflow: hidden;
}
.hero-content { position: relative; z-index: 1; max-width: 640px; }
.avatar-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 22px;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0s;
}
.avatar {
  width: 112px;
  height: 112px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--blue);
  display: block;
}
.avatar-status {
  position: absolute;
  bottom: 6px;
  right: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--green);
  border: 3px solid var(--bg);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--blue);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.05s;
}
.hero h1 {
  font-size: clamp(42px, 7vw, 84px);
  letter-spacing: -0.02em;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.15s;
}
.role {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--blue);
  margin: 10px 0 22px;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.28s;
}
.hero-desc {
  color: var(--text-secondary);
  max-width: 56ch;
  margin: 0 auto;
  font-size: 16px;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.4s;
}
.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  border: 0.5px solid var(--border-strong);
  border-radius: 20px;
  padding: 7px 16px;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.52s;
}
.hero-status .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(79, 169, 115, 0.6);
  animation: pulse-dot 2.4s infinite;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.45;
  background-image:
    linear-gradient(30deg, var(--border) 1px, transparent 1px),
    linear-gradient(150deg, var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 44px 76px;
  mask-image: radial-gradient(ellipse 60% 55% at 50% 45%, #000 30%, transparent 75%);
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 196, 0.12) 50%, transparent 100%);
  animation: heroScan 6s ease-in-out infinite;
}
@keyframes heroScan {
  0%, 100% { transform: translateY(-40%); }
  50% { transform: translateY(40%); }
}

.node-circle {
  fill: var(--surface-2);
  stroke: var(--blue);
  stroke-width: 1.5;
  cursor: pointer;
  transition: fill 0.2s ease, stroke 0.2s ease;
  transform-origin: center;
  transform-box: fill-box;
}
.node-circle:hover, .node-circle.active { fill: var(--blue-dim); stroke: var(--amber); }
.node-group { cursor: pointer; }
.node-group:focus { outline: none; }
.node-group:focus-visible .node-circle {
  stroke: var(--amber);
  stroke-width: 3;
  filter: drop-shadow(0 0 6px var(--amber));
}
.node-group {
  opacity: 0;
  animation: popIn 0.5s cubic-bezier(0.2, 0.9, 0.3, 1.3) forwards;
}
.edge-line {
  stroke: var(--border-strong);
  stroke-width: 1;
  fill: none;
  opacity: 0.7;
  animation: drawIn 1s ease forwards;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface-2);
  border: 0.5px solid var(--border-strong);
  border-radius: 6px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  opacity: 0;
  transform: translate(-50%, -110%);
  transition: opacity 0.12s ease;
  white-space: nowrap;
  z-index: 10;
}
.tooltip.visible { opacity: 1; }
.tooltip .tt-role { color: var(--amber); font-size: 10px; display: block; margin-top: 2px; }

/* TICKER */
.ticker {
  border-top: 0.5px solid var(--border);
  border-bottom: 0.5px solid var(--border);
  overflow: hidden;
  padding: 12px 0;
  margin: 6vh 0;
}
.ticker-track {
  display: flex;
  gap: 14px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  width: max-content;
  animation: ticker 28s linear infinite;
}
@keyframes ticker { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* SECTIONS */
h2 { font-size: 28px; margin-bottom: 40px; display: flex; align-items: baseline; gap: 12px; }
.num { font-family: var(--font-mono); font-size: 14px; color: var(--blue); }

/* EXPERTISE */
.expertise { margin-bottom: 10vh; }
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}
.expertise-block {
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
}
.expertise-block h3 { font-size: 15px; margin-bottom: 14px; color: var(--text); }
.tags { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tags li {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  border: 0.5px solid var(--border);
  border-radius: 4px;
  padding: 3px 7px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.tag-icon { width: 11px; height: 11px; fill: var(--text-secondary); flex-shrink: 0; }
.expertise-block .tags li { color: var(--text-secondary); }
.cert-strip {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  border-top: 0.5px solid var(--border);
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 0;
}

.experience, .education { margin-bottom: 10vh; }

.experience-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 48px;
  align-items: start;
}

.experience-visual { position: sticky; top: 96px; }
.strip-viewport {
  width: 100%;
  height: 190px;
  overflow: hidden;
  position: relative;
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: 10px;
}
#filmstrip { position: absolute; top: 0; left: 0; height: 100%; will-change: transform; }
.playhead {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--amber);
  opacity: 0.55;
  pointer-events: none;
}
.playhead::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--amber);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 8px 2px rgba(242, 169, 59, 0.55);
}
.visual-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin: 10px 2px 0;
}

.sat-line { stroke: var(--border); stroke-width: 1; opacity: 0.8; }
.sat-node {
  fill: var(--surface-2);
  stroke: var(--border-strong);
  stroke-width: 1.2;
  cursor: pointer;
}
.sat-node.sat-cert { stroke: var(--amber); }
.sat-node.sat-icon { stroke: var(--blue); }
.sat-node:hover { fill: var(--blue-dim); }
.sat-icon-path { fill: var(--text-secondary); }
.sat-group:hover .sat-icon-path { fill: var(--blue); }
.sat-label {
  fill: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 8px;
  text-anchor: middle;
  pointer-events: none;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 0.5px solid var(--border);
}

.entry .years { position: relative; }
.entry.in-view .years::after {
  content: "";
  position: absolute;
  left: -14px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  border: 1.5px solid var(--amber);
  animation: handshake 0.9s ease-out 1;
}
@keyframes handshake {
  0% { transform: scale(0.3); opacity: 1; }
  100% { transform: scale(2.4); opacity: 0; }
}

@media (max-width: 900px) {
  .experience-layout { grid-template-columns: 1fr; }
  .experience-visual { display: none; }
}

.entry {
  padding: 28px 0;
  border-bottom: 0.5px solid var(--border);
  transition: background 0.4s ease;
}
.entry.highlight { background: rgba(59, 130, 196, 0.08); }
.entry-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.years { font-family: var(--font-mono); font-size: 12px; color: var(--blue); }
.badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 10px;
  border: 0.5px solid;
}
.badge-active { color: var(--green); border-color: var(--green); }
.badge-done { color: var(--text-muted); border-color: var(--border); }
.badge-progress { color: var(--amber); border-color: var(--amber); }

.entry h3 { font-size: 20px; margin-bottom: 4px; }
.entry .org { color: var(--blue); font-size: 14px; margin: 0 0 10px; font-family: var(--font-mono); }
.entry p:not(.org) { color: var(--text-secondary); max-width: 70ch; margin: 0; }

/* CONTACT / BLUEPRINT TITLE BLOCK */
.contact { padding-bottom: 6vh; }
.title-block {
  background: var(--blueprint-bg);
  background-image:
    linear-gradient(var(--blueprint-grid) 0.5px, transparent 0.5px),
    linear-gradient(90deg, var(--blueprint-grid) 0.5px, transparent 0.5px);
  background-size: 24px 24px;
  border: 1px solid var(--blueprint-ink);
  border-radius: 10px;
  padding: 32px 36px;
  color: var(--blueprint-ink);
}
.title-block-head {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--blueprint-ink-2);
  margin-bottom: 20px;
}
.title-block h2 { color: var(--blueprint-ink); font-size: 30px; margin-bottom: 24px; }
.title-block-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 18px;
  border-top: 1px solid var(--blueprint-ink);
  padding-top: 16px;
}
.title-block-grid > div { display: flex; flex-direction: column; gap: 4px; }
.tb-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--blueprint-ink-2);
}
.tb-value { font-size: 14px; color: var(--blueprint-ink); }
.tb-link:hover { text-decoration: underline; }

.copyright {
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  margin: 32px 0 0;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero { min-height: auto; padding-top: 40px; }
  section, header, footer { padding: 0 5vw; }

  .nav-burger { display: flex; }
  .nav-status { display: none; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(11, 15, 19, 0.97);
    backdrop-filter: blur(8px);
    border-bottom: 0.5px solid var(--border);
    padding: 4px 0 12px;
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a {
    padding: 13px 6vw;
    font-size: 14px;
    border-top: 0.5px solid var(--border);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ticker-track, .nav-status .dot, .hero-status .dot { animation: none; }
  .eyebrow, .hero h1, .role, .hero-desc, .hero-status, .node-group, .edge-line {
    animation: none; opacity: 1; stroke-dashoffset: 0; transform: none;
  }
  .hero-bg::after { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .entry.in-view .years::after { animation: none; display: none; }
}