/* Global layout */
:root {
  --bg: #0d1117;
  --text: #c9d1d9;
  --muted: #8b949e;
  --accent: #00ff66; /* Terminal green */
  --border: #30363d;
  --card-bg: #161b22;
  --radius: 10px;
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(13, 17, 23, 0.96);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.brand-title {
  font-weight: 650;
  font-size: 1.05rem;
  color: #ffffff;
}

.brand-tagline {
  font-size: 0.9rem;
  color: var(--muted);
}

.site-nav a {
  font-size: 0.9rem;
  margin-left: 10px;
  color: var(--muted);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Hero / layout */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 24px;
  margin-top: 20px;
  align-items: center;
}

@media (max-width: 720px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  padding: 18px 18px 16px;
  margin-top: 16px;
}

.card h2, .card h3 {
  margin-top: 0;
}

/* Sections */
.section-title {
  font-size: 1.1rem;
  margin-bottom: 4px;
  font-weight: 600;
}
.section-subtitle {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 4px;
}

/* Typography */
h1 {
  font-size: 1.8rem;
  margin: 0 0 4px;
  color: #ffffff;
}
h2 {
  font-size: 1.2rem;
  margin: 16px 0 4px;
  color: #ffffff;
}
h3 {
  font-size: 1rem;
  margin: 10px 0 2px;
  color: #ffffff;
}
.muted {
  color: var(--muted);
  font-size: 0.9rem;
}
.small {
  font-size: 0.85rem;
}

/* Hero avatar */
.avatar-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.avatar-circle {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, #80ffb5, #008033);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #f9fafb;
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 10px;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.avatar-circle img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Meta rows */
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  justify-content: space-between;
}
.meta-label {
  font-size: 0.85rem;
  color: var(--muted);
}

/* Project / research items */
.item-block {
  margin-top: 10px;
}
.item-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px;
  align-items: baseline;
}
.item-title {
  font-weight: 550;
}
.item-meta {
  font-size: 0.85rem;
  color: var(--muted);
}
.item-links a {
  font-size: 0.85rem;
}

/* Timeline */
.timeline {
  border-left: 2px solid var(--border);
  margin-top: 12px;
  padding-left: 16px;
}
.timeline-entry {
  position: relative;
  margin-bottom: 16px;
}
.timeline-entry::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
}
.timeline-year {
  font-weight: 600;
  margin-top: 18px;
}

/* Lists */
ul {
  padding-left: 1.2rem;
  margin: 6px 0 4px;
}
li {
  margin-bottom: 4px;
}

/* Footer */
.site-footer {
  margin-top: 32px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Utility */
.chip {
  display: inline-block;
  font-size: 0.8rem;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(0, 255, 102, 0.1);
  color: var(--accent);
  border: 1px solid rgba(0, 255, 102, 0.2);
  margin-right: 4px;
}