:root {
  --paper: #f3f2ee;
  --panel: #ffffff;
  --ink: #15161a;
  --ink-soft: #3a3b42;
  --muted: #6c6e77;
  --line: #d8d6cf;
  --line-strong: #15161a;
  --accent: #1f3fd6;
  --accent-soft: #5e7bff;
  --max: 1180px;
  --gut: 28px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gut);
}

h1, h2, h3, h4 { font-family: "Archivo", sans-serif; line-height: 1.02; }

.kicker, .idx, .spec-row dt, .entry-when, .portrait-tag,
.nav-links i, .skill-col h4, .edu-meta, .footer-inner,
.metric .cap, .contact-loc, .btn {
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 0.04em;
}

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
  z-index: 100;
  transition: width 0.08s linear;
}

/* ---------- Reveal (only when JS is present, so content survives JS failure) ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 242, 238, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-strong);
}
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
}
.brand-mark { width: 19px; height: 19px; color: var(--accent); }
.nav-links { display: flex; gap: 30px; }
.nav-links a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  position: relative;
  padding-bottom: 3px;
  transition: color 0.15s ease;
}
.nav-links a i { font-style: normal; font-size: 0.65rem; color: var(--muted); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.25s var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a:hover i, .nav-links a.active i { color: var(--accent); }
.nav-links a.active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: 0; cursor: pointer; padding: 6px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); transition: 0.25s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding-top: clamp(48px, 8vw, 96px); overflow: hidden; }
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(21,22,26,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(21,22,26,0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 90% at 70% 0%, #000 35%, transparent 80%);
          mask-image: radial-gradient(120% 90% at 70% 0%, #000 35%, transparent 80%);
  pointer-events: none;
}
.hero > .container { position: relative; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(32px, 6vw, 80px);
  align-items: end;
  padding-bottom: clamp(28px, 5vw, 56px);
}
.kicker { font-size: 0.78rem; text-transform: uppercase; color: var(--muted); margin-bottom: 26px; }
.kicker span { color: var(--accent); margin-inline: 4px; }

.display {
  font-weight: 900;
  font-size: clamp(4rem, 15vw, 11rem);
  letter-spacing: -0.045em;
  line-height: 0.86;
  margin-bottom: 30px;
}
.lead {
  max-width: 46ch;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--ink-soft);
  margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.btn {
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  padding: 13px 22px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-2px); }
.btn-link {
  background: none; color: var(--ink); border-color: transparent;
  padding-inline: 6px; text-decoration: underline; text-underline-offset: 4px;
}
.btn-link:hover { background: none; color: var(--accent); transform: none; }

.hero-portrait { position: relative; }
.hero-portrait img {
  width: clamp(180px, 24vw, 280px);
  height: clamp(220px, 30vw, 340px);
  object-fit: cover;
  filter: grayscale(1) contrast(1.05);
  border: 1px solid var(--line-strong);
  display: block;
  transition: filter 0.5s var(--ease);
}
.hero-portrait:hover img { filter: grayscale(0) contrast(1); }
.portrait-tag {
  position: absolute;
  bottom: 10px; left: 10px;
  font-size: 0.62rem;
  background: var(--paper);
  color: var(--ink);
  padding: 3px 7px;
  border: 1px solid var(--line-strong);
}

/* Truss */
.truss { width: 100%; height: clamp(54px, 7vw, 88px); display: block; margin: 6px 0 18px; }
.truss-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 3000;
  stroke-dashoffset: 3000;
  animation: draw 2.2s var(--ease) forwards;
}
.truss-line:nth-child(2) { animation-delay: 0.25s; }
.truss-line:nth-child(3) { animation-delay: 0.5s; }
.truss-nodes circle { fill: var(--accent); opacity: 0; animation: pop 0.4s var(--ease) forwards 1.6s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes pop { to { opacity: 1; } }

/* Spec row */
.spec-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}
.spec-row > div { padding: 16px 20px; border-left: 1px solid var(--line); }
.spec-row > div:first-child { border-left: 0; padding-left: 0; }
.spec-row dt { font-size: 0.68rem; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.spec-row dd { font-size: 0.92rem; font-weight: 500; }

/* ---------- Metrics ---------- */
.metrics { background: var(--ink); color: var(--paper); }
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-block: clamp(40px, 6vw, 64px);
  gap: 1px;
}
.metric { padding: 8px 24px; border-left: 1px solid rgba(243,242,238,0.16); }
.metric:first-child { border-left: 0; padding-left: 0; }
.metric .num {
  display: block;
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 12px;
}
.metric .cap { font-size: 0.72rem; color: rgba(243,242,238,0.6); text-transform: uppercase; line-height: 1.5; }

/* ---------- Sections ---------- */
.section { padding: clamp(56px, 9vw, 104px) 0; border-top: 1px solid var(--line); }
.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 48px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-strong);
}
.idx { font-size: 0.8rem; color: var(--accent); }
.section-head h2 { font-weight: 800; font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -0.02em; }

/* About */
.about-body { max-width: 760px; margin-left: auto; display: grid; gap: 20px; }
.about-lead {
  font-family: "Archivo", sans-serif;
  font-weight: 500;
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
}
.about-body p:not(.about-lead) { color: var(--ink-soft); font-size: 1.05rem; }

/* Experience */
.entry {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: clamp(20px, 5vw, 64px);
  padding: 30px 0;
  border-top: 1px solid var(--line);
}
.entry:first-of-type { border-top: 0; padding-top: 0; }
.entry-when { display: flex; flex-direction: column; gap: 2px; font-size: 0.78rem; color: var(--muted); padding-top: 4px; }
.entry-when span:first-child { color: var(--ink); font-weight: 500; }
.entry-main h3 { font-weight: 700; font-size: 1.3rem; letter-spacing: -0.01em; }
.entry-main .org { color: var(--accent); font-size: 0.9rem; margin: 5px 0 0; font-weight: 500; }
.entry-main ul { list-style: none; margin-top: 16px; display: grid; gap: 9px; }
.entry-main li { position: relative; padding-left: 22px; color: var(--ink-soft); font-size: 0.98rem; }
.entry-main li::before { content: "—"; position: absolute; left: 0; color: var(--accent); }

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.skill-col { background: var(--paper); padding: 24px; transition: background 0.2s ease; }
.skill-col:hover { background: var(--panel); }
.skill-col h4 { font-size: 0.72rem; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; font-weight: 500; }
.skill-col ul { list-style: none; display: grid; gap: 10px; }
.skill-col li { font-size: 0.96rem; font-weight: 500; }

/* Education */
.edu-list { display: grid; }
.edu-row {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr auto;
  gap: 24px;
  align-items: baseline;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  transition: padding-left 0.25s var(--ease);
}
.edu-row:first-child { border-top: 0; }
.edu-row:hover { padding-left: 12px; }
.edu-school h3 { font-weight: 700; font-size: 1.25rem; }
.edu-school p { color: var(--muted); font-size: 0.85rem; margin-top: 3px; }
.edu-detail { color: var(--ink-soft); font-size: 1rem; }
.edu-meta { text-align: right; font-size: 0.82rem; color: var(--ink); white-space: nowrap; }
.edu-meta span { color: var(--muted); }

/* Testimonial */
.section-quote { background: var(--panel); }
.quote { max-width: 920px; margin-inline: auto; text-align: center; }
.quote blockquote {
  font-family: "Archivo", sans-serif;
  font-weight: 500;
  font-size: clamp(1.5rem, 3.6vw, 2.5rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.quote figcaption { margin-top: 32px; display: flex; flex-direction: column; gap: 4px; }
.q-name { font-weight: 700; font-family: "Archivo", sans-serif; }
.q-role { font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; color: var(--muted); }

/* Contact */
.section-contact { background: var(--ink); color: var(--paper); border-top: 1px solid var(--ink); }
.section-contact .section-head { border-color: rgba(243,242,238,0.25); }
.section-contact .section-head h2 { color: var(--paper); }
.section-contact .idx { color: var(--accent-soft); }
.contact-lead {
  font-family: "Archivo", sans-serif;
  font-weight: 500;
  font-size: clamp(1.4rem, 3.5vw, 2.4rem);
  letter-spacing: -0.015em;
  max-width: 18ch;
  margin-bottom: 28px;
}
.contact-link {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: clamp(1.8rem, 6vw, 3.6rem);
  letter-spacing: -0.03em;
  color: var(--paper);
  text-decoration: none;
  display: inline-block;
  border-bottom: 2px solid rgba(243,242,238,0.3);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.contact-link:hover { color: var(--accent-soft); border-color: var(--accent-soft); }
.contact-loc { font-size: 0.85rem; color: rgba(243,242,238,0.6); margin-top: 26px; text-transform: uppercase; letter-spacing: 0.05em; }

/* Footer */
.site-footer { background: var(--ink); color: rgba(243,242,238,0.6); padding: 22px 0 36px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.06em; }
.footer-inner a { color: rgba(243,242,238,0.6); text-decoration: none; }
.footer-inner a:hover { color: var(--paper); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-row { grid-template-columns: repeat(2, 1fr); }
  .spec-row > div:nth-child(3) { border-left: 0; padding-left: 0; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 28px 1px; }
  .metric:nth-child(3) { border-left: 0; padding-left: 0; }
}
@media (max-width: 680px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 60px; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--panel);
    border-bottom: 1px solid var(--line-strong);
    padding: 6px 28px 14px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
  .hero-grid { grid-template-columns: 1fr; align-items: start; }
  .hero-portrait { order: -1; }
  .hero-portrait img { width: 150px; height: 185px; }
  .entry { grid-template-columns: 1fr; gap: 8px; }
  .entry-when { flex-direction: row; gap: 8px; }
  .entry-when span:nth-child(2)::before { content: "– "; }
  .edu-row { grid-template-columns: 1fr; gap: 4px; }
  .edu-meta { text-align: left; }
  .edu-row:hover { padding-left: 0; }
}
@media (max-width: 460px) {
  .skills-grid { grid-template-columns: 1fr; }
  .spec-row, .metrics-grid { grid-template-columns: 1fr; }
  .spec-row > div, .metric { border-left: 0; padding-left: 0; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .truss-line { stroke-dashoffset: 0; animation: none; }
  .truss-nodes circle { opacity: 1; animation: none; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}