*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --dark-navy:      #020c1b;
  --navy:           #0a192f;
  --light-navy:     #112240;
  --lightest-navy:  #233554;
  --slate:          #8892b0;
  --light-slate:    #a8b2d1;
  --lightest-slate: #ccd6f6;
  --white:          #e6f1ff;
  --green:          #64ffda;
  --green-tint:     rgba(100, 255, 218, 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'SF Mono', 'Fira Mono', monospace;
  --easing:    cubic-bezier(0.645, 0.045, 0.355, 1);
  --transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
  --border-radius: 4px;
  --nav-height:        100px;
  --nav-scroll-height:  70px;
}

html { scroll-behavior: smooth; }

body {
  background-color: var(--navy);
  color: var(--slate);
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.3;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--green); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--green); }
sup { font-size: 0.7em; }

/* ── SCROLLBAR ─────────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--navy); }
::-webkit-scrollbar-thumb { background: var(--lightest-navy); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--slate); }

/* ── HEADER ────────────────────────────────────── */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 0;
  z-index: 100;
  width: 100%;
  height: var(--nav-height);
  padding: 0 50px;
  transition: var(--transition);
}

header.scrolled {
  height: var(--nav-scroll-height);
  background-color: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}

.logo {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 2px;
  flex-shrink: 0;
}

nav { display: flex; align-items: center; }

nav ol {
  display: flex;
  list-style: none;
  counter-reset: nav-counter;
  gap: 4px;
}

nav ol li { counter-increment: nav-counter; }

nav ol li a {
  color: var(--lightest-slate);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 14px;
}

nav ol li a::before {
  content: "0" counter(nav-counter) ". ";
  color: var(--green);
}

nav ol li a:hover { color: var(--green); }

.resume-btn {
  display: inline-block;
  color: var(--green);
  background: transparent;
  border: 1px solid var(--green);
  border-radius: var(--border-radius);
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  margin-left: 15px;
  transition: var(--transition);
  cursor: pointer;
}
.resume-btn:hover { background-color: var(--green-tint); }

/* ── SIDE ELEMENTS ─────────────────────────────── */
.side {
  width: 40px;
  position: fixed;
  bottom: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.side::after {
  content: '';
  display: block;
  width: 1px;
  height: 90px;
  background-color: var(--light-slate);
}

.side-left  { left: 40px; }
.side-right { right: 40px; }

.side-links { display: flex; flex-direction: column; align-items: center; gap: 20px; }

.side-links a {
  color: var(--light-slate);
  display: flex;
  transition: var(--transition);
}
.side-links a:hover { color: var(--green); transform: translateY(-3px); }
.side-links svg { width: 20px; height: 20px; fill: currentColor; }

.side-email a {
  color: var(--light-slate);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  writing-mode: vertical-rl;
  transition: var(--transition);
}
.side-email a:hover { color: var(--green); transform: translateY(-3px); }

/* ── MAIN ──────────────────────────────────────── */
main {
  padding: 0 200px;
  max-width: 1600px;
  margin: 0 auto;
}

section {
  margin: 0 auto;
  max-width: 900px;
  padding: 100px 0;
}

/* ── FADE-IN ANIMATION ─────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--easing), transform 0.6s var(--easing);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ── SECTION HEADINGS ──────────────────────────── */
.section-heading {
  display: flex;
  align-items: center;
  margin-bottom: 40px;
  font-size: clamp(26px, 5vw, 32px);
  font-weight: 600;
  color: var(--lightest-slate);
  white-space: nowrap;
}
.section-heading .num {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: clamp(16px, 3vw, 20px);
  font-weight: 400;
  margin-right: 10px;
}
.section-heading::after {
  content: '';
  display: block;
  width: 100%;
  max-width: 300px;
  height: 1px;
  background-color: var(--lightest-navy);
  margin-left: 20px;
  flex-shrink: 1;
}

/* ── HERO ──────────────────────────────────────── */
#hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  padding: 0;
  max-width: 1000px;
}

.hero-overline {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: clamp(14px, 5vw, 16px);
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(40px, 8vw, 80px);
  font-weight: 600;
  color: var(--lightest-slate);
  line-height: 1.1;
  margin-bottom: 10px;
}

.hero-subtitle {
  font-size: clamp(30px, 6vw, 70px);
  font-weight: 600;
  color: var(--slate);
  line-height: 1.1;
  margin-bottom: 25px;
}

.hero-description {
  max-width: 560px;
  color: var(--slate);
  font-size: 18px;
  line-height: 1.65;
  margin-bottom: 50px;
}

.hero-cta { display: flex; gap: 20px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  color: var(--green);
  background: transparent;
  border: 1px solid var(--green);
  border-radius: var(--border-radius);
  padding: 16px 28px;
  font-family: var(--font-mono);
  font-size: 14px;
  transition: var(--transition);
}
.btn::after { content: ' →'; }
.btn:hover { background-color: var(--green-tint); }

.resume-btn::after { content: ' ↗'; }

/* ── ABOUT ─────────────────────────────────────── */
.about-inner {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 50px;
  align-items: start;
}

.about-text p {
  color: var(--slate);
  line-height: 1.8;
  margin-bottom: 16px;
  font-size: 17px;
}
.about-text p:last-of-type { margin-bottom: 20px; }

.skills-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 10px;
  list-style: none;
  padding: 0;
}
.skills-list li {
  color: var(--light-slate);
  font-family: var(--font-mono);
  font-size: 13px;
  position: relative;
  padding-left: 18px;
}
.skills-list li::before { content: '▹'; color: var(--green); position: absolute; left: 0; }

.skills-groups { display: flex; flex-direction: column; gap: 14px; }
.skills-group-label {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.about-img-wrapper { max-width: 300px; margin-top: 8px; }

.about-img-box { position: relative; }
.about-img-box::after {
  content: '';
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  border: 2px solid var(--green);
  border-radius: var(--border-radius);
  top: 15px;
  left: 15px;
  z-index: -1;
  transition: var(--transition);
}
.about-img-box:hover::after { top: 10px; left: 10px; }

.about-img-photo {
  width: 100%;
  border-radius: var(--border-radius);
  display: block;
  filter: grayscale(20%) contrast(1.05);
  transition: var(--transition);
  mix-blend-mode: normal;
}
.about-img-box:hover .about-img-photo {
  filter: none;
}

/* ── EXPERIENCE ────────────────────────────────── */
.experience-inner {
  display: flex;
  gap: 20px;
  min-height: 360px;
}

.tab-list {
  display: flex;
  flex-direction: column;
  width: 140px;
  flex-shrink: 0;
  border-left: 2px solid var(--lightest-navy);
}

.tab-btn {
  background: none;
  border: none;
  border-left: 2px solid transparent;
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 12px 20px;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  margin-left: -2px;
  white-space: nowrap;
}
.tab-btn:hover   { color: var(--green); background-color: var(--green-tint); }
.tab-btn.active  { color: var(--green); border-left-color: var(--green); background-color: var(--green-tint); }

.tab-panels { flex: 1; padding: 10px 30px; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.tab-panel h3 {
  color: var(--lightest-slate);
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 5px;
}
.tab-panel h3 .company { color: var(--green); }

.tab-panel .period {
  color: var(--light-slate);
  font-family: var(--font-mono);
  font-size: 13px;
  margin-bottom: 25px;
  line-height: 1.8;
}

.tab-panel ul { list-style: none; padding: 0; }
.tab-panel ul li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 12px;
  color: var(--slate);
  line-height: 1.65;
  font-size: 16px;
}
.tab-panel ul li::before { content: '▹'; color: var(--green); position: absolute; left: 0; top: 2px; }
.tab-panel ul li strong { color: var(--lightest-slate); }

/* ── FEATURED PROJECTS ─────────────────────────── */
.featured-projects { display: flex; flex-direction: column; gap: 80px; }

.featured-project {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: center;
}

.project-content {
  position: relative;
  z-index: 2;
  grid-column: 1 / 8;
  grid-row: 1;
}
.featured-project.right .project-content {
  grid-column: 6 / 13;
  text-align: right;
}

.project-image {
  grid-column: 6 / 13;
  grid-row: 1;
  position: relative;
  z-index: 1;
}
.featured-project.right .project-image { grid-column: 1 / 8; }

.project-img-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  border-radius: var(--border-radius);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.project-img-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background-color: rgba(10, 25, 47, 0.6);
  transition: var(--transition);
}
.featured-project:hover .project-img-placeholder::after { background-color: rgba(10, 25, 47, 0.2); }
.project-img-placeholder svg { width: 80px; height: 80px; fill: var(--green); opacity: 0.35; position: relative; z-index: 1; }

.project-overline {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  margin-bottom: 10px;
}

.project-title {
  color: var(--lightest-slate);
  font-size: 26px;
  font-weight: 600;
  margin-bottom: 20px;
}
.project-title a { color: inherit; }
.project-title a:hover { color: var(--green); }

.project-desc {
  background-color: var(--light-navy);
  border-radius: var(--border-radius);
  padding: 25px;
  color: var(--light-slate);
  font-size: 15px;
  line-height: 1.75;
  box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
  position: relative;
  z-index: 2;
}
.featured-project.right .project-desc { text-align: left; }

.project-tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  list-style: none;
  padding: 0;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--light-slate);
}
.featured-project.right .project-tech-list { justify-content: flex-end; }

.project-links {
  display: flex;
  gap: 15px;
  margin-top: 12px;
  align-items: center;
}
.featured-project.right .project-links { justify-content: flex-end; }
.project-links a { color: var(--light-slate); display: flex; }
.project-links a:hover { color: var(--green); }
.project-links svg { width: 20px; height: 20px; fill: currentColor; }
.project-links .tag-link {
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--green);
  color: var(--green);
  padding: 4px 10px;
  border-radius: var(--border-radius);
}
.project-links .tag-link::after { content: ' ↗'; }
.project-links .tag-link:hover { background-color: var(--green-tint); }

/* ── OTHER PROJECTS GRID ───────────────────────── */
#other-projects { padding-top: 20px; }

.other-heading {
  text-align: center;
  color: var(--lightest-slate);
  font-size: 26px;
  font-weight: 600;
  margin-bottom: 8px;
}
.other-sub {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate);
  margin-bottom: 40px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 15px;
}

.project-card {
  background-color: var(--light-navy);
  border-radius: var(--border-radius);
  padding: 30px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}
.project-card:hover { transform: translateY(-5px); box-shadow: 0 20px 30px -15px rgba(2, 12, 27, 0.7); }

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 30px;
}
.card-year {
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
}
.folder-icon svg { width: 40px; height: 40px; fill: var(--green); }

.card-links { display: flex; gap: 12px; }
.card-links a { color: var(--light-slate); display: flex; }
.card-links a:hover { color: var(--green); }
.card-links svg { width: 18px; height: 18px; fill: currentColor; }

.card-title {
  color: var(--lightest-slate);
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 12px;
  transition: var(--transition);
}
.project-card:hover .card-title { color: var(--green); }
.card-title a.stretched-link::after { content: ''; position: absolute; inset: 0; z-index: 1; }

.card-desc {
  color: var(--light-slate);
  font-size: 14px;
  line-height: 1.65;
  flex: 1;
}

.card-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
}

.card-tag-links {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  position: relative;
  z-index: 2;
}
.card-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  border: 1px solid var(--green);
  color: var(--green);
  padding: 3px 9px;
  border-radius: var(--border-radius);
  transition: var(--transition);
}
.card-tag::after { content: ' ↗'; }
.card-tag:hover { background-color: var(--green-tint); }

/* ── PUBLICATIONS ──────────────────────────────── */
.publication-item {
  background-color: var(--light-navy);
  border-radius: var(--border-radius);
  padding: 30px;
  transition: var(--transition);
}
.publication-item:hover { transform: translateY(-3px); box-shadow: 0 20px 30px -15px rgba(2, 12, 27, 0.7); }

.pub-venue {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  margin-bottom: 10px;
}

.pub-title {
  color: var(--lightest-slate);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.pub-authors {
  color: var(--light-slate);
  font-size: 15px;
  margin-bottom: 5px;
}
.pub-authors strong { color: var(--lightest-slate); }

.pub-note {
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  margin-bottom: 15px;
}

.pub-contribution {
  color: var(--slate);
  font-size: 14px;
  line-height: 1.7;
  border-top: 1px solid var(--lightest-navy);
  padding-top: 15px;
  margin-top: 15px;
}

.contrib-label {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 12px;
  display: block;
  margin-bottom: 6px;
}

.pub-links { display: flex; gap: 12px; margin-top: 18px; }
.pub-links a {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  border: 1px solid var(--green);
  border-radius: var(--border-radius);
  padding: 6px 14px;
  transition: var(--transition);
}
.pub-links a::after { content: ' ↗'; }
.pub-links a:hover { background-color: var(--green-tint); }

/* ── CONTACT ───────────────────────────────────── */
#contact {
  max-width: 600px;
  text-align: center;
  padding: 100px 0 200px;
}

.contact-overline {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 16px;
  margin-bottom: 20px;
}
.contact-overline::before { content: "05. "; }

.contact-title {
  color: var(--lightest-slate);
  font-size: clamp(40px, 5vw, 60px);
  font-weight: 600;
  margin-bottom: 20px;
}

.contact-text {
  color: var(--slate);
  font-size: 18px;
  line-height: 1.7;
  margin-bottom: 50px;
}

/* ── FOOTER ────────────────────────────────────── */
footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate);
}
footer p + p { margin-top: 8px; }

/* ── RESPONSIVE ────────────────────────────────── */
@media (max-width: 1080px) {
  main { padding: 0 100px; }
  .side-left  { left: 20px; }
  .side-right { right: 20px; }
}

@media (max-width: 768px) {
  main { padding: 0 25px; }
  header { padding: 0 25px; }
  nav ol { display: none; }
  .resume-btn { display: none; }
  .side { display: none; }
  .about-inner { grid-template-columns: 1fr; }
  .about-img-wrapper { max-width: 200px; margin: 0 auto; }

  .experience-inner { flex-direction: column; }
  .tab-list {
    flex-direction: row;
    width: 100%;
    border-left: none;
    border-bottom: 2px solid var(--lightest-navy);
    overflow-x: auto;
    scrollbar-width: none;
  }
  .tab-list::-webkit-scrollbar { display: none; }
  .tab-btn {
    border-left: none;
    border-bottom: 2px solid transparent;
    margin-left: 0;
    margin-bottom: -2px;
    padding: 10px 16px;
  }
  .tab-btn.active { border-left: none; border-bottom-color: var(--green); }
  .tab-panels { padding: 15px 0; }

  .featured-project {
    grid-template-columns: 1fr;
    background-color: var(--light-navy);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
  }
  .project-content,
  .featured-project.right .project-content {
    grid-column: 1 / -1;
    text-align: left;
  }
  .project-image { display: none; }
  .project-desc { padding: 0; background: none; box-shadow: none; }
  .project-tech-list,
  .featured-project.right .project-tech-list { justify-content: flex-start; }
  .project-links,
  .featured-project.right .project-links { justify-content: flex-start; }
}

@media (max-width: 480px) {
  main { padding: 0 15px; }
  header { padding: 0 15px; }
  .hero-cta { flex-direction: column; }
  .btn { text-align: center; }
}