:root {
  --ink: #12283D;
  --ink-2: #1C3C57;
  --paper: #EAE6D9;
  --paper-2: #F6F3EA;
  --line: #7FA0BC;
  --line-soft: rgba(127, 160, 188, 0.35);
  --amber: #D9822B;
  --amber-dark: #B9691C;
  --text: #182631;
  --muted: #5B6B77;
  --muted-on-ink: #A9BDCF;
  --teal: #4C8B72;
  --display: 'Space Grotesk', sans-serif;
  --body: 'IBM Plex Sans', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--display);
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

a {
  color: inherit;
}

::selection {
  background: var(--amber);
  color: #fff;
}

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

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

/* ---------- Blueprint corner marks & sheet labels ---------- */
.sheet {
  position: relative;
  border-top: 1px solid var(--line-soft);
  padding: 96px 0 88px;
}

.sheet::before,
.sheet::after {
  content: "";
  position: absolute;
  top: 0;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--line);
}

.sheet::before {
  left: 28px;
  border-left: 1px solid var(--line);
}

.sheet::after {
  right: 28px;
  border-right: 1px solid var(--line);
}

.sheet-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  margin-bottom: 48px;
}

.sheet-label span:last-child {
  color: var(--line);
}

/* ---------- Nav ---------- */
header.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(234, 230, 217, 0.88);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line-soft);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mark {
  width: 36px;
  height: 36px;
  border: 1px solid var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease, color .15s ease;
}

.nav-links a:hover {
  border-color: var(--amber);
  color: var(--amber-dark);
}

.nav-cta {
  font-family: var(--mono);
  font-size: 13px;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 8px 14px;
  transition: background .15s ease, color .15s ease;
}

.nav-cta:hover {
  background: var(--ink);
  color: var(--paper-2);
}

.nav-toggle {
  display: none;
}

/* ---------- Hero ---------- */
.hero {
  background: var(--ink);
  color: var(--paper-2);
  position: relative;
  overflow: hidden;
  padding: 168px 0 96px;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.16;
  mask-image: radial-gradient(ellipse at 30% 20%, black 40%, transparent 78%);
}

.hero-inner {
  position: relative;
  z-index: 2;
}

.hero-grid-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: start;
}

.hero-left {
  min-width: 0;
}

.hero-right {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 6px;
}

.hero-avatar-wrap {
  position: relative;
  width: 100%;
  max-width: 280px;
  border: 1px solid var(--line);
  padding: 8px;
  background: var(--ink-2);
  margin-bottom: 36px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(217, 130, 43, 0.2);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.hero-avatar-wrap::before,
.hero-avatar-wrap::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border-color: var(--amber);
  border-style: solid;
}

.hero-avatar-wrap::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}

.hero-avatar-wrap::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

.hero-avatar-wrap:hover {
  transform: translateY(-3px);
  border-color: var(--amber);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.45), 0 0 20px rgba(217, 130, 43, 0.3);
}

.hero-avatar {
  width: 100%;
  height: 310px;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  display: block;
  border-radius: 2px;
  filter: contrast(1.02);
}

.hero-avatar-caption {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted-on-ink);
  letter-spacing: 0.04em;
  margin-top: 8px;
  display: flex;
  justify-content: space-between;
  text-transform: uppercase;
}

.eyebrow-tech {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted-on-ink);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.eyebrow-tech .dot {
  width: 6px;
  height: 6px;
  background: var(--amber);
  border-radius: 50%;
  flex-shrink: 0;
}

.hero-name {
  font-size: clamp(26px, 3.8vw, 48px);
  line-height: 1.08;
  color: #fff;
  white-space: nowrap;
  letter-spacing: -0.015em;
  margin: 0;
}

.hero .role {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--amber);
  margin-top: 14px;
  display: block;
}

.hero p.lede {
  max-width: 52ch;
  margin-top: 24px;
  font-size: 18px;
  color: var(--muted-on-ink);
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--mono);
  font-size: 14px;
  text-decoration: none;
  padding: 13px 22px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--amber);
  color: #1A1006;
}

.btn-primary:hover {
  background: var(--amber-dark);
}

.btn-ghost {
  border-color: var(--muted-on-ink);
  color: var(--paper-2);
}

.btn-ghost:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.btn-ghost.on-paper {
  border-color: var(--ink);
  color: var(--ink);
}

.btn-ghost.on-paper:hover {
  background: var(--ink);
  color: var(--paper-2);
}

.waveform {
  margin-top: 64px;
  width: 100%;
  max-width: 640px;
}

.waveform path {
  fill: none;
  stroke: var(--amber);
  stroke-width: 2;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: draw 2.6s ease-out .3s forwards;
}

.waveform .baseline {
  stroke: var(--line-soft);
  stroke-width: 1;
  stroke-dasharray: none;
  stroke-dashoffset: 0;
  animation: none;
}

@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .waveform path {
    animation: none;
    stroke-dashoffset: 0;
  }
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 64px;
  align-items: start;
}

.lead-text {
  font-size: 20px;
  color: var(--ink);
  max-width: 46ch;
}

.lead-text strong {
  color: var(--amber-dark);
  font-weight: 600;
}

.profile-right {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.profile-img-wrap {
  position: relative;
  border: 1px solid var(--line);
  padding: 8px;
  background: var(--paper-2);
  margin-bottom: 8px;
  box-shadow: 0 4px 16px rgba(18, 40, 61, 0.06);
}

.profile-img-wrap::before,
.profile-img-wrap::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-color: var(--amber);
  border-style: solid;
}

.profile-img-wrap::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}

.profile-img-wrap::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

.profile-img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center top;
  display: block;
  filter: contrast(1.02);
}

.profile-img-caption {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-top: 8px;
  display: flex;
  justify-content: space-between;
  text-transform: uppercase;
}

.meta-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 13px;
}

.meta-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  color: var(--text);
}

.meta-list li span:first-child {
  color: var(--muted);
}

.meta-list li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

/* ---------- Experience ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tl-item {
  display: grid;
  grid-template-columns: 160px 1px 1fr;
  gap: 0;
  padding-bottom: 56px;
  position: relative;
}

.tl-item:last-child {
  padding-bottom: 0;
}

.tl-date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  padding-top: 4px;
}

.tl-rule {
  position: relative;
  background: var(--line-soft);
}

.tl-rule::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid var(--amber);
  transform: translateX(-50%);
  border-radius: 50%;
}

.tl-content {
  padding-left: 32px;
}

.tl-content h3 {
  font-size: 21px;
}

.tl-content .org {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--amber-dark);
  margin-top: 4px;
  display: block;
}

.tl-content ul {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--text);
}

.tl-content li {
  margin-bottom: 8px;
  max-width: 64ch;
}

.tl-content li::marker {
  color: var(--line);
}

/* ---------- Projects ---------- */
.proj {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 32px;
  padding: 36px 0;
  border-top: 1px solid var(--line-soft);
}

.proj:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.proj-icon {
  padding-top: 6px;
}

.proj-icon svg {
  width: 64px;
  height: 64px;
}

.proj h3 {
  font-size: 22px;
}

.proj .tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  display: block;
  margin-top: 6px;
}

.proj p.desc {
  margin-top: 14px;
  max-width: 66ch;
  color: var(--text);
}

.proj ul {
  margin: 14px 0 0;
  padding-left: 18px;
  max-width: 66ch;
}

.proj li {
  margin-bottom: 6px;
}

.proj li::marker {
  color: var(--line);
}

.clientline {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
}

.more-projects {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid var(--line-soft);
  padding: 7px 12px;
  color: var(--text);
}

/* ---------- Research spotlight ---------- */
.research {
  background: var(--ink);
  color: var(--paper-2);
  margin: 0;
  padding: 96px 0;
}

.research .sheet-label {
  color: var(--muted-on-ink);
}

.research .sheet-label span:last-child {
  color: var(--line);
}

.research::before,
.research::after {
  display: none;
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.research h2 {
  color: #fff;
  font-size: clamp(26px, 3vw, 34px);
  max-width: 16ch;
}

.research .status {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--amber);
  border: 1px solid var(--amber);
  display: inline-block;
  padding: 5px 10px;
  margin-bottom: 20px;
}

.research p {
  color: var(--muted-on-ink);
  margin-top: 18px;
  max-width: 52ch;
}

.research .specs {
  margin-top: 26px;
  list-style: none;
  padding: 0;
  font-family: var(--mono);
  font-size: 13px;
}

.research .specs li {
  padding: 10px 0;
  border-top: 1px solid rgba(169, 189, 207, 0.25);
  display: flex;
  gap: 14px;
}

.research .specs li span:first-child {
  color: var(--muted-on-ink);
  flex-shrink: 0;
  width: 130px;
}

.research .specs li span:last-child {
  color: #fff;
}

.echo-diagram {
  width: 100%;
  height: auto;
}

.echo-diagram .pulse {
  fill: none;
  stroke: var(--amber);
  stroke-width: 2;
}

.echo-diagram .grid-line {
  stroke: rgba(169, 189, 207, 0.25);
  stroke-width: 1;
}

.echo-diagram .node {
  fill: var(--ink);
  stroke: var(--teal);
  stroke-width: 1.5;
}

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px 32px;
}

.skill-group h3 {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  text-transform: none;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.skill-tags span {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text);
  border: 1px solid var(--line-soft);
  padding: 6px 10px;
}

/* ---------- Teaching ---------- */
.teach-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.teach-item {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.teach-item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.teach-item h4 {
  font-size: 17px;
  font-weight: 500;
}

.teach-item .inst {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
  display: block;
}

.teach-item .dates {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--amber-dark);
  text-align: right;
  padding-top: 2px;
}

/* ---------- Education / certs ---------- */
.ed-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}

.ed-item {
  margin-bottom: 26px;
}

.ed-item h4 {
  font-size: 17px;
  font-weight: 500;
}

.ed-item .inst {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  display: block;
  margin-top: 4px;
}

.cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.cert-list li {
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 14.5px;
}

.cert-list li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.cert-list .issuer {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  display: block;
  margin-top: 3px;
}

/* ---------- Contact / footer ---------- */
.contact {
  background: var(--ink);
  color: var(--paper-2);
}

.contact::before,
.contact::after {
  border-color: var(--muted-on-ink);
}

.contact .sheet-label {
  color: var(--muted-on-ink);
}

.contact .sheet-label span:last-child {
  color: var(--line);
}

.contact h2 {
  color: #fff;
  font-size: clamp(30px, 4vw, 44px);
  max-width: 16ch;
}

.contact p {
  color: var(--muted-on-ink);
  margin-top: 16px;
  max-width: 48ch;
  font-size: 17px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  margin-top: 48px;
  align-items: start;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 14px;
}

.contact-list li {
  padding: 14px 0;
  border-top: 1px solid rgba(169, 189, 207, 0.25);
}

.contact-list li:last-child {
  border-bottom: 1px solid rgba(169, 189, 207, 0.25);
}

.contact-list li span {
  color: var(--muted-on-ink);
  display: block;
  font-size: 11px;
  margin-bottom: 4px;
}

.contact-list a {
  text-decoration: none;
  color: #fff;
  border-bottom: 1px solid transparent;
}

.contact-list a:hover {
  border-color: var(--amber);
}

.reference-note {
  font-size: 13px;
  color: var(--muted-on-ink);
  margin-top: 24px;
  font-family: var(--mono);
  line-height: 1.7;
}

footer.site-footer {
  background: var(--ink);
  border-top: 1px solid rgba(169, 189, 207, 0.25);
  padding: 28px 0;
  color: var(--muted-on-ink);
  font-family: var(--mono);
  font-size: 12px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-socials a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted-on-ink);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 12px;
  transition: color 0.15s ease, transform 0.15s ease;
}

.footer-socials a:hover {
  color: var(--amber);
  transform: translateY(-1px);
}

.footer-socials svg {
  flex-shrink: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .hero-grid-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-right {
    justify-content: flex-start;
  }

  .hero-avatar-wrap {
    max-width: 240px;
    margin-bottom: 24px;
  }

  .hero-avatar {
    height: 270px;
  }

  .hero-name {
    white-space: normal;
  }
}

@media (max-width: 860px) {

  .about-grid,
  .research-grid,
  .ed-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
  }

  .tl-item {
    grid-template-columns: 100px 1px 1fr;
  }

  .proj {
    grid-template-columns: 56px 1fr;
  }

  .proj-icon svg {
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 640px) {
  .hero-name {
    font-size: clamp(24px, 6.5vw, 36px);
    white-space: normal;
  }

  .hero-name-row {
    gap: 14px;
  }

  .hero-avatar-ring {
    width: 84px;
    height: 84px;
    padding: 3px;
  }

  .nav-links {
    display: none;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .teach-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .teach-item .dates {
    text-align: left;
  }

  .sheet {
    padding: 72px 0 64px;
  }

  .hero {
    padding: 140px 0 72px;
  }
}