/* ================================================
   Ink & Paper — Minimal Academic Design
   ================================================ */

:root {
  --color-bg: #fafaf9;
  --color-text: #1c1917;
  --color-accent: #059669;
  --color-accent-light: #d1fae5;
  --color-meta: #78716c;
  --color-border: #e7e5e4;
  --color-surface: #ffffff;
  --color-hover: #f5f5f4;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  --max-width: 800px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0c0a09;
    --color-text: #e7e5e4;
    --color-accent: #34d399;
    --color-accent-light: #064e3b;
    --color-meta: #a8a29e;
    --color-border: #292524;
    --color-surface: #1c1917;
    --color-hover: #292524;
  }
}

/* ---- 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);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- Layout ---- */

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

/* ---- Header / Nav ---- */

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

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

.nav-left,
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-lang {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-meta);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all 0.2s;
}

.nav-lang:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* ---- Footer ---- */

.site-footer {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  font-size: 0.8rem;
  color: var(--color-meta);
}

/* ---- Home Page ---- */

.home-name {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-xs);
  line-height: 1.2;
}

.home-name-sub {
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--color-meta);
  margin-bottom: var(--spacing-xl);
}

.affiliation-list {
  list-style: none;
  margin-bottom: var(--spacing-xl);
}

.affiliation-item {
  margin-bottom: var(--spacing-md);
}

.affiliation-role {
  font-weight: 500;
  font-size: 0.95rem;
}

.affiliation-org {
  font-size: 0.85rem;
  color: var(--color-meta);
}

.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-xl) 0;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-meta);
  margin-bottom: var(--spacing-md);
}

.interest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.interest-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 999px;
}

.pub-list-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  margin-bottom: var(--spacing-sm);
  transition: color 0.2s;
}

.pub-list-link:hover {
  color: var(--color-text);
}

.contact-email {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-meta);
  margin-bottom: var(--spacing-md);
}

.social-links {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.social-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-meta);
  text-decoration: none;
  transition: color 0.2s;
}

.social-link:hover {
  color: var(--color-accent);
}

.social-link i,
.social-link .ai {
  font-size: 1.1rem;
}

/* ---- Publications Page ---- */

.page-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.pub-note {
  font-size: 0.85rem;
  color: var(--color-meta);
  margin-bottom: var(--spacing-xl);
}

.pub-note a {
  color: var(--color-accent);
  text-decoration: none;
}

.pub-note a:hover {
  text-decoration: underline;
}

/* Publication layout — sidebar + main */
.pub-layout {
  display: flex;
  gap: var(--spacing-xl);
  max-width: calc(var(--max-width) + 120px);
  margin: var(--spacing-2xl) auto 0;
}

.year-sidebar {
  position: sticky;
  top: var(--spacing-lg);
  align-self: flex-start;
  flex-shrink: 0;
  width: 90px;
  max-height: calc(100vh - var(--spacing-2xl));
  overflow-y: auto;
}

.year-nav-home {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  text-align: center;
  transition: all 0.2s;
  margin-bottom: var(--spacing-md);
}

.year-nav-home:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

.year-nav-lang {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-meta);
  text-decoration: none;
  text-align: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  margin-bottom: var(--spacing-lg);
  transition: all 0.2s;
}

.year-nav-section {
  margin-bottom: var(--spacing-md);
}

.year-nav-section-title {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
  transition: color 0.2s;
  cursor: pointer;
}

.year-nav-section-title:hover {
  color: var(--color-accent);
}

.year-nav-section .year-nav-links {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.year-nav-section:hover .year-nav-links {
  max-height: 600px;
}

.year-nav-lang:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.year-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.year-nav-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-meta);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 3px;
  transition: all 0.2s;
}

.year-nav-item:hover {
  color: var(--color-accent);
  background: var(--color-hover);
}

.pub-main {
  flex: 1;
  min-width: 0;
}

/* Year section */
.year-section {
  margin-bottom: var(--spacing-2xl);
}

.year-heading {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-accent);
}

/* Category tag on each entry */
.pub-category-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 1px 8px;
  border-radius: 3px;
  margin-bottom: var(--spacing-xs);
}

.pub-peer-reviewed-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 1px 6px;
  border-radius: 3px;
  margin-bottom: var(--spacing-xs);
  margin-left: var(--spacing-xs);
}

/* Publication entry */
.pub-entry {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.pub-entry:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pub-entry--compact {
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: none;
}

.pub-entry--compact:last-child {
  padding-bottom: 0;
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--color-meta);
  margin-bottom: var(--spacing-xs);
  line-height: 1.5;
}

.pub-authors .author-highlight {
  color: var(--color-accent);
  font-weight: 600;
}

.pub-title {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: var(--spacing-xs);
}

.pub-venue {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-meta);
  line-height: 1.5;
  margin-bottom: var(--spacing-sm);
}

.pub-links {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--color-meta);
  text-decoration: none;
  padding: 4px;
  transition: color 0.2s;
}

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

.pub-badge {
  display: inline-flex;
  align-items: center;
  font-size: 1.1rem;
  color: var(--color-accent);
  padding: 4px;
}

/* Entries without timeline (awards, organizing, etc.) */
.entry-list {
  list-style: none;
}

.entry-item {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.entry-item:last-child {
  border-bottom: none;
}

.entry-text {
  font-size: 0.9rem;
  line-height: 1.6;
}

.entry-detail {
  font-size: 0.85rem;
  color: var(--color-meta);
  line-height: 1.5;
}

/* Organizing activities sub-sections */
.sub-section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-meta);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.sub-list {
  list-style: none;
}

.sub-list li {
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-meta);
}

/* ---- Responsive ---- */

@media (max-width: 600px) {
  .home-name {
    font-size: 1.6rem;
  }

  .home-name-sub {
    font-size: 1rem;
  }

  .page-title {
    font-size: 1.6rem;
  }

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

  .interest-tags {
    gap: var(--spacing-xs);
  }

  .interest-tag {
    font-size: 0.75rem;
    padding: 2px var(--spacing-sm);
  }

  .pub-layout {
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
  }

  .year-sidebar {
    position: static;
    width: 100%;
    max-height: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .year-nav-home {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .year-nav-links {
    flex-direction: row;
    gap: 2px;
    flex-wrap: nowrap;
  }
}