:root {
  --bg: #f8f8f6;
  --surface: #ffffff;
  --ink: #111111;
  --muted: #777777;
  --faint: #e8e8e4;
  --accent: #0047ab;
  --accent-light: #eef2ff;
}

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

body {
  font-family: "IBM Plex Sans", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* NAV */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 248, 246, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--faint);
}
.nav-inner {
  max-width: 1000px;
  margin: auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}
.nav-name {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
  letter-spacing: 0.03em;
}
.nav-links a:hover {
  color: var(--accent);
}

/* LAYOUT */
.container {
  max-width: 1000px;
  margin: auto;
  padding: 0 2rem;
}
section {
  padding: 4.5rem 0;
}
section + section {
  border-top: 1px solid var(--faint);
}

.section-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
}

/* HERO */
#about {
  padding-top: 7rem;
  padding-bottom: 5rem;
}
.hero-layout {
  display: grid;
  grid-template-columns: 1fr 140px;
  gap: 3rem;
  align-items: start;
}
h1 {
  font-family: "IBM Plex Serif", serif;
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  font-weight: 500;
  line-height: 1.15;
  margin-bottom: 0.6rem;
  animation: fadeUp 0.5s ease both;
}
.hero-role {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 1.4rem;
  animation: fadeUp 0.5s 0.1s ease both;
}
.hero-bio {
  color: #444;
  font-size: 0.97rem;
  max-width: 500px;
  margin-bottom: 1.8rem;
  animation: fadeUp 0.5s 0.2s ease both;
}
.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  animation: fadeUp 0.5s 0.3s ease both;
}
.btn {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.45rem 1rem;
  border-radius: 2px;
  text-decoration: none;
  transition: all 0.15s;
  border: 1px solid transparent;
  display: inline-block;
}
.btn-primary {
  background: var(--ink);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent);
}
.btn-ghost {
  border-color: var(--faint);
  color: var(--muted);
  background: var(--surface);
}
.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.avatar-wrap {
  animation: fadeUp 0.5s 0.15s ease both;
}
.avatar {
  width: 130px;
  height: 130px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  overflow: hidden;
  border-radius: 50%;
}
.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* INTERESTS */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.25rem 0.7rem;
  border-radius: 2px;
  border: 1px solid #c7d5f7;
}

/* PUBLICATIONS */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.pub-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1.2rem;
  padding: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--faint);
  border-radius: 2px;
  transition: border-color 0.15s;
}
.pub-item:hover {
  border-color: #ccc;
}
.pub-year {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--muted);
  padding-top: 0.2rem;
  text-align: right;
}
.pub-title {
  font-family: "IBM Plex Serif", serif;
  font-size: 0.97rem;
  font-weight: 500;
  margin-bottom: 0.2rem;
  line-height: 1.4;
}
.pub-authors {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}
.pub-authors strong {
  color: var(--ink);
  font-weight: 500;
}
.pub-venue {
  font-size: 0.78rem;
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  margin-bottom: 0.7rem;
}
.pub-badges {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.badge {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--faint);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  text-decoration: none;
  transition: all 0.12s;
}
.badge:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* CV / TIMELINE */
.tl {
  display: flex;
  flex-direction: column;
}
.tl-item {
  display: grid;
  grid-template-columns: 115px 1fr;
  gap: 1.5rem;
  position: relative;
  padding-bottom: 2rem;
}
.tl-item:last-child {
  padding-bottom: 0;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: 112px;
  top: 10px;
  bottom: 0;
  width: 1px;
  background: var(--faint);
}
.tl-item:last-child::before {
  display: none;
}
.tl-item::after {
  content: "";
  position: absolute;
  left: 109px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--surface);
  border: 1.5px solid var(--accent);
}
.tl-date {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--muted);
  text-align: right;
  padding-top: 0.1rem;
  padding-right: 1rem;
  line-height: 1.5;
}
.tl-body h3 {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.1rem;
}
.tl-org {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.tl-body p {
  font-size: 0.85rem;
  color: #555;
}

.skills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}
.skill {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: #555;
  background: var(--surface);
  border: 1px solid var(--faint);
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
}

.skill.language {
  background: var(--accent-light);
  color: var(--accent);
}
.skill.techno {
  background: #fff0fd;
  color: #ff03dd;
}
.skill.subject {
  background: #fff9f0;
  color: #f79000;
}

/* PROJECTS */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--faint);
  border-radius: 2px;
  padding: 1.3rem;
  transition: border-color 0.15s;
}
.project-card:hover {
  border-color: #aaa;
}
.project-card h3 {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.project-card p {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}
.project-link {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--accent);
  text-decoration: none;
}
.project-link:hover {
  text-decoration: underline;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 0.8rem;
}
.ptag {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.65rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--faint);
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
}

/* CONTACT */
.contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.contact-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--faint);
  border-radius: 2px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s;
}
.contact-row:hover {
  border-color: var(--accent);
}
.c-icon {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  color: var(--muted);
  width: 80px;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}
.c-val {
  font-size: 0.88rem;
}

/* FOOTER */
footer {
  border-top: 1px solid var(--faint);
  text-align: center;
  padding: 2rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--muted);
}

/* ANIMATIONS */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* RESPONSIVE */
@media (max-width: 580px) {
  .hero-layout {
    grid-template-columns: 1fr;
  }
  .avatar-wrap {
    display: none;
  }
  .tl-item {
    grid-template-columns: 80px 1fr;
  }
  .tl-item::before {
    left: 77px;
  }
  .tl-item::after {
    left: 74px;
  }
  .nav-links {
    gap: 1.2rem;
  }
}