/* ═══════════════════════════════════════════
   Andrew Anogie Uduimoh — Personal Website
   Theme: Clear, Minimal, Cyber-Academic
   Fonts: IBM Plex Sans + IBM Plex Mono
═══════════════════════════════════════════ */

/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #F8F7F4;
  --bg-alt:    #F0EEE9;
  --surface:   #FFFFFF;
  --border:    #D8D5CE;
  --border-strong: #BEBAB2;
  --text:      #1A1916;
  --text-2:    #4A4840;
  --text-3:    #7A7670;
  --accent:    #0A4F3C;       /* deep forest green — cyber-secure feel */
  --accent-2:  #1A8C64;       /* lighter green */
  --mono:      'IBM Plex Mono', monospace;
  --sans:      'IBM Plex Sans', sans-serif;
  --rad:       4px;
  --nav-h:     64px;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
strong { font-weight: 500; }

/* ─── Nav ─── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(248, 247, 244, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

#nav.scrolled { box-shadow: 0 1px 20px rgba(0,0,0,0.06); }

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 4px 10px;
  border-radius: var(--rad);
  transition: background 0.2s, color 0.2s;
}
.nav-logo:hover { background: var(--accent); color: #fff; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--text-2);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { transform: scaleX(1); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.25s, opacity 0.25s;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 1rem 2rem;
  border-top: 1px solid var(--border);
  gap: 0;
}
.mobile-menu.open { display: flex; }

.mobile-link {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--text-2);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}
.mobile-link:last-child { border-bottom: none; }
.mobile-link:hover { color: var(--accent); }

/* ─── Buttons ─── */
.btn-primary {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  padding: 10px 22px;
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  border-radius: var(--rad);
  transition: background 0.2s, transform 0.15s;
}
.btn-primary:hover { background: #083d30; transform: translateY(-1px); }

.btn-ghost {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  padding: 10px 22px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--rad);
  transition: background 0.2s, color 0.2s, transform 0.15s;
}
.btn-ghost:hover { background: var(--accent); color: #fff; transform: translateY(-1px); }

/* ─── Section Shared ─── */
.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header { margin-bottom: 3.5rem; }

.section-tag {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent-2);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--sans);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
}

/* ─── Hero ─── */
.hero {
  min-height: 100vh;
  padding-top: var(--nav-h);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* subtle grid background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.35;
  pointer-events: none;
}

.hero-grid {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 4rem;
  align-items: center;
  position: relative;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  margin-bottom: 1.25rem;
}

.hero-name {
  font-family: var(--sans);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.hero-role {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--text-2);
}

.hero-affil {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-3);
  margin-bottom: 1.75rem;
}
.hero-affil a { color: var(--accent-2); border-bottom: 1px solid transparent; transition: border-color 0.2s; }
.hero-affil a:hover { border-color: var(--accent-2); }

.hero-bio {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-2);
  max-width: 500px;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.hero-socials {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-3);
  transition: color 0.2s;
}
.social-link svg { flex-shrink: 0; }
.social-link:hover { color: var(--accent); }

/* Photo frame */
.hero-image-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.hero-image-frame {
  position: relative;
  width: 300px;
  height: 360px;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  border-radius: var(--rad);
  filter: grayscale(8%);
}

.frame-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border-color: var(--accent);
  border-style: solid;
}
.frame-corner.tl { top: -6px; left: -6px; border-width: 2px 0 0 2px; }
.frame-corner.tr { top: -6px; right: -6px; border-width: 2px 2px 0 0; }
.frame-corner.bl { bottom: -6px; left: -6px; border-width: 0 0 2px 2px; }
.frame-corner.br { bottom: -6px; right: -6px; border-width: 0 2px 2px 0; }

.hero-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-2);
  border-radius: 50%;
  animation: pulse 2.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-3);
}

.scroll-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(to bottom, var(--text-3), transparent);
  animation: scrollDrop 2s ease-in-out infinite;
}

@keyframes scrollDrop {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  100% { opacity: 0; transform: scaleY(1); transform-origin: bottom; }
}

/* ─── About ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 4rem;
  margin-bottom: 3rem;
}

.about-bio p {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-2);
  line-height: 1.85;
  margin-bottom: 1.25rem;
}
.about-bio p:last-child { margin-bottom: 0; }

.meta-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--rad);
  background: var(--surface);
  margin-bottom: 1rem;
}
.meta-card:last-child { margin-bottom: 0; }

.meta-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--accent-2);
  margin-bottom: 0.75rem;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-list li {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-2);
  background: var(--bg);
}

.edu-item { margin-bottom: 1rem; }
.edu-item:last-child { margin-bottom: 0; }

.edu-degree {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
}
.edu-school {
  display: block;
  font-size: 0.8rem;
  color: var(--text-2);
  margin-top: 2px;
}
.edu-detail {
  display: block;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
  margin-top: 3px;
}

.cert-list {
  list-style: none;
}
.cert-list li {
  font-size: 0.83rem;
  color: var(--text-2);
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.cert-list li:last-child { border-bottom: none; }

.cert-year {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text-3);
}

/* Stats */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--rad);
  overflow: hidden;
  background: var(--surface);
}

.stat {
  flex: 1;
  padding: 1.5rem 1rem;
  text-align: center;
}

.stat-num {
  display: block;
  font-family: var(--mono);
  font-size: 2rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-desc {
  font-size: 0.75rem;
  color: var(--text-3);
  line-height: 1.4;
}

.stat-divider {
  width: 1px;
  height: 60px;
  background: var(--border);
  flex-shrink: 0;
}

/* ─── Research ─── */
.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.research-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.research-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(10, 79, 60, 0.06);
}

.rc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.rc-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  padding: 3px 8px;
  border: 1px solid var(--accent-2);
  border-radius: 2px;
}

.rc-status {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border-radius: 2px;
}
.rc-status.active { background: #E8F5F0; color: var(--accent); }
.rc-status.completed { background: var(--bg-alt); color: var(--text-3); }

.rc-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}

.rc-desc {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.7;
}

.rc-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.rc-bullets li {
  font-size: 0.8rem;
  color: var(--text-3);
  padding-left: 1rem;
  position: relative;
}
.rc-bullets li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-size: 0.7rem;
}

.rc-date {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: var(--text-3);
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

/* ─── Publications ─── */
.pub-group { margin-bottom: 2.5rem; }
.pub-group:last-of-type { margin-bottom: 0; }

.pub-group-title {
  margin-bottom: 1.25rem;
}

.pub-type-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--text-3);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 2px;
}

.pub-list {
  list-style: none;
  counter-reset: pub-counter;
}

.pub-item {
  counter-increment: pub-counter;
  padding: 1.25rem 0 1.25rem 2.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: relative;
}
.pub-item:last-child { border-bottom: none; }
.pub-item::before {
  content: counter(pub-counter, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.4rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-3);
  letter-spacing: 0.05em;
}

.pub-authors {
  font-size: 0.82rem;
  color: var(--text-3);
}
.pub-authors strong { color: var(--text); font-weight: 500; }

.pub-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
}

.pub-venue {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-2);
  font-style: italic;
}

.pub-cta { margin-top: 2rem; }

/* ─── Teaching ─── */
.teaching-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.teaching-sub {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 1rem;
}

.teaching-p {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.course-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.course-table th {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-3);
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.course-table td {
  padding: 0.65rem 0.75rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.course-table td:first-child {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  white-space: nowrap;
}
.course-table td:last-child {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
  white-space: nowrap;
}
.course-table tr:last-child td { border-bottom: none; }

.supervision-years {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.supervision-years span {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-2);
  background: var(--surface);
}

/* Timeline */
.exp-timeline { display: flex; flex-direction: column; gap: 0; }

.exp-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.exp-item:first-child { padding-top: 0; }
.exp-item:last-child { border-bottom: none; }

.exp-period {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  color: var(--text-3);
  padding-top: 3px;
  line-height: 1.5;
}

.exp-body { font-size: 0.85rem; color: var(--text-2); }
.exp-body strong { color: var(--text); display: block; margin-bottom: 0.25rem; }
.exp-body p { font-size: 0.8rem; color: var(--text-3); margin-top: 0.35rem; line-height: 1.6; }

/* ─── Service ─── */
.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 1.5rem;
}

.sc-year {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  margin-bottom: 0.5rem;
}

.sc-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.35rem;
  line-height: 1.35;
}

.sc-org {
  font-size: 0.78rem;
  color: var(--text-3);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.sc-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sc-bullets li {
  font-size: 0.8rem;
  color: var(--text-2);
  padding-left: 1rem;
  position: relative;
  line-height: 1.5;
}
.sc-bullets li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--text-3);
}

/* ─── Contact ─── */
.contact-container { max-width: 800px; }

.contact-intro {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-2);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 1.25rem;
}

.contact-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--text-3);
  margin-bottom: 0.5rem;
}

.contact-value {
  font-size: 0.9rem;
  color: var(--text);
  word-break: break-all;
  transition: color 0.2s;
}
a.contact-value:hover { color: var(--accent); }

.contact-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ─── Footer ─── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-name {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-2);
  font-weight: 500;
}

.footer-sep { color: var(--border); }

.footer-dept {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-3);
}

.footer-copy {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-3);
  margin-left: auto;
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero-image-wrap { order: -1; }
  .hero-image-frame { width: 220px; height: 270px; margin: 0 auto; }
  .hero-name { font-size: clamp(2.5rem, 8vw, 3.5rem); }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .research-grid { grid-template-columns: 1fr; }
  .teaching-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .service-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-direction: column; }
  .stat-divider { width: 60px; height: 1px; }
}

@media (max-width: 600px) {
  .section { padding: 4rem 0; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary,
  .hero-actions .btn-ghost { text-align: center; }
  .contact-links { flex-direction: column; }
  .exp-item { grid-template-columns: 1fr; gap: 0.25rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .footer-copy { margin-left: 0; }
}

/* ─── Animations ─── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}