/* ===== Design Tokens ===== */
:root {
  --bg-primary: #FFFDF7;
  --bg-secondary: #FFF9EE;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #7a7a6c;
  --accent: #8B7355;
  --accent-hover: #6B5640;
  --border: #EDE6D6;
  --tag-bg: #F5EFE0;
  --tag-text: #6B5B3E;

  --font-body: 'Source Serif 4', 'Georgia', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Menlo', monospace;

  --max-width: 700px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3.5rem;
  --spacing-2xl: 6rem;
}

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

html {
  scroll-behavior: smooth;
  font-size: 17px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  min-height: 100vh;
}

/* Subtle paper grain texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.022;
  pointer-events: none;
  z-index: 1000;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

::selection {
  background-color: #EDE6D6;
  color: var(--text-primary);
}

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 253, 247, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-sm) 0;
  transition: box-shadow 0.3s ease;
}

.nav.scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

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

.nav__name {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav__name:hover {
  color: var(--text-primary);
}

.nav__links {
  display: flex;
  gap: var(--spacing-lg);
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

.nav__links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav__links a:hover {
  color: var(--text-primary);
}

/* ===== Links ===== */
a {
  color: var(--accent);
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-hover);
}

/* Animated underline for inline links */
.link-underline {
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.3s ease, color 0.2s ease;
  padding-bottom: 1px;
}

.link-underline:hover {
  background-size: 100% 1px;
  color: var(--accent-hover);
}

/* ===== Hero / Elevator Pitch ===== */
.hero {
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  border-bottom: 1px solid var(--border);
}

.hero__pitch {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.01em;
}

.hero__pitch p {
  margin-bottom: var(--spacing-md);
}

.hero__pitch p:last-child {
  margin-bottom: 0;
}

.hero__pitch strong {
  color: var(--text-primary);
  font-weight: 500;
}

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.hero__links a {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.hero__links a:hover {
  color: var(--accent-hover);
}

.hero__links .separator {
  color: var(--border);
  user-select: none;
}

/* ===== Sections ===== */
.section {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--border);
}

.section:last-of-type {
  border-bottom: none;
}

.section__title {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

/* ===== Highlights ===== */
.highlights-list {
  list-style: none;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.highlight-item:last-child {
  margin-bottom: 0;
}

.highlight-item strong {
  color: var(--text-primary);
  font-weight: 500;
}

.highlight-icon {
  flex-shrink: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== Publications ===== */
.pub-list {
  list-style: none;
}

.pub-item {
  margin-bottom: var(--spacing-lg);
  padding-left: 0;
}

.pub-item:last-child {
  margin-bottom: 0;
}

.pub-item__title {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: var(--spacing-xs);
}

.pub-item__title a {
  color: var(--text-primary);
  transition: color 0.2s ease;
}

.pub-item__title a:hover {
  color: var(--accent);
}

.pub-item__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-sans);
  font-size: 0.8rem;
}

.pub-tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.15em 0.6em;
  border-radius: 3px;
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.pub-tag--award {
  background: #F0E6C8;
  color: #7A6530;
}

.pub-item__links {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.pub-item__links a {
  color: var(--accent);
  margin-right: var(--spacing-sm);
}

/* ===== Experience ===== */
.exp-list {
  list-style: none;
}

.exp-item {
  margin-bottom: var(--spacing-lg);
  padding-left: 0;
}

.exp-item:last-child {
  margin-bottom: 0;
}

.exp-item__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: 0.2rem;
}

.exp-item__role {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

.exp-item__date {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.exp-item__org {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.exp-item__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== Education ===== */
.edu-item {
  margin-bottom: var(--spacing-lg);
}

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

.edu-item__school {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

.edu-item__degree {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.edu-item__details {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ===== Awards ===== */
.awards-list {
  list-style: none;
}

.award-item {
  margin-bottom: var(--spacing-md);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.award-item:last-child {
  margin-bottom: 0;
}

.award-item strong {
  font-weight: 500;
  color: var(--text-primary);
}

/* ===== Footer ===== */
.footer {
  padding: var(--spacing-xl) 0 var(--spacing-2xl);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Scroll Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-children .fade-in-child {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.stagger-children .fade-in-child.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
  }

  .hero__pitch {
    font-size: 0.85rem;
  }

  .section {
    padding: var(--spacing-lg) 0;
  }

  .exp-item__header {
    flex-direction: column;
    gap: 0;
  }

  .nav__links {
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .hero__pitch {
    font-size: 0.82rem;
  }

  .hero__links {
    gap: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
  }

  .nav__links {
    gap: var(--spacing-sm);
    font-size: 0.8rem;
  }
}