/* =========================================================================
   Tianyi Ma — homepage styles
   Tailwind utility classes carry most of the layout; this file holds only
   custom rules that don't map cleanly to utilities.
   ========================================================================= */

:root {
  --color-accent: #2563eb;        /* blue-600 */
  --color-accent-strong: #1d4ed8; /* blue-700 */
  --color-text: #1f2937;          /* gray-800 */
  --color-muted: #6b7280;         /* gray-500 */
  --color-bg: #f8fafc;            /* slate-50 */
  --radius-card: 0.75rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* ---------- Page switching ---------- */
.page { display: none; }
.page.active { display: block; }

/* ---------- Section fade-in ---------- */
.fade-in-section {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeIn 0.6s ease-out forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Navigation links ---------- */
.nav-link {
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

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

.nav-link.active {
  color: var(--color-accent);
  font-weight: 500;
  border-bottom-color: var(--color-accent);
}

/* ---------- Inline content links ---------- */
.link {
  color: var(--color-accent);
  text-decoration: none;
}

.link:hover {
  text-decoration: underline;
}

/* ---------- Publication author list ---------- */
.publication-authors {
  font-style: italic;
}

.publication-authors .author-me {
  font-weight: 700;
  font-style: normal;
}

/* ---------- Misc utilities ---------- */
.uppercase { text-transform: uppercase; }

/* Slightly tighter spacing on news date column for narrow screens */
.news-date {
  font-weight: 600;
  color: var(--color-muted);
  width: 7rem;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .news-date { width: 5.5rem; }
}