/* ============================================================
   Design Tokens
   ============================================================ */
:root {
  --color-bg: #d4d4e8;
  --color-surface: #eaeaf5;
  --color-surface-dark: #c8c8dc;
  --color-accent: #5a3e6b;
  --color-accent-dark: #3d2a4a;
  --color-text: #1e2240;
  --color-text-muted: #4a5470;
  --color-border: #c0c0d8;

  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Inter', system-ui, sans-serif;

  --max-width: 800px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
}

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

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

body {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background: linear-gradient(135deg, #e8e8f5 0%, #d4d4e8 50%, #c8c8dc 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

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

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

ul {
  list-style: none;
}

/* ============================================================
   Layout
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  min-height: 60vh;
}

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; font-weight: 500; }

.label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* ============================================================
   Navigation
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(232, 232, 245, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.site-name:hover {
  color: var(--color-accent);
}

.site-nav ul {
  display: flex;
  gap: 2rem;
}

.site-nav a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md) 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-name {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.footer-contact {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-contact a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

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

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-md);
  align-items: center;
}

.hero-text .label {
  display: block;
  margin-bottom: var(--spacing-sm);
}

.hero-text h1 {
  margin-bottom: 0.75rem;
}

.hero-text .hero-position {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.cv-link {
  display: inline-block;
  margin-top: 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: opacity 0.2s;
}

.cv-link:hover {
  opacity: 0.7;
}

.hero-image img {
  width: 160px;
  height: 200px;
  object-fit: cover;
  object-position: top center;
  border-radius: 2px;
  filter: grayscale(15%);
}

/* ============================================================
   Page Header (inner pages)
   ============================================================ */
.page-header {
  padding: var(--spacing-lg) 0 var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

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

.section:last-child {
  border-bottom: none;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: var(--spacing-md);
}

.section-heading h2 {
  line-height: 1;
}

/* ============================================================
   Bio / About
   ============================================================ */
.bio p + p {
  margin-top: 1rem;
}

/* ============================================================
   Role Cards (home page)
   ============================================================ */
.role-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.role-card {
  display: block;
  padding: 2rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  color: var(--color-text);
}

.role-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(124, 107, 170, 0.12);
  color: var(--color-text);
}

.role-card h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.role-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.role-card .card-link {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* ============================================================
   Publication / Project Lists
   ============================================================ */
.item-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.item {
  padding-left: 1.25rem;
  border-left: 2px solid var(--color-border);
  transition: border-color 0.2s ease;
}

.item:hover {
  border-left-color: var(--color-accent);
}

.item-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 0.25rem;
}

.item-title a {
  color: var(--color-text);
}

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

.item-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.item-desc {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Tags / Chips
   ============================================================ */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.825rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Current Projects
   ============================================================ */
.project-card {
  padding: 1.5rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.project-card + .project-card {
  margin-top: 1rem;
}

.project-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Contact
   ============================================================ */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-links a {
  font-size: 1rem;
}

/* ============================================================
   Consulting Page
   ============================================================ */
.expertise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.expertise-item {
  padding: 1.25rem 1.5rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.expertise-item h3 {
  font-size: 1rem;
  font-family: var(--font-serif);
  margin-bottom: 0.25rem;
}

.expertise-item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 1rem;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-image {
    order: -1;
  }

  .hero-image img {
    width: 120px;
    height: 150px;
  }

  .role-cards {
    grid-template-columns: 1fr;
  }

  .expertise-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}