/* ---------------------------------------------------
   Vishwa Shah — personal site
   Top nav + centered content column, blue/light-blue theme
--------------------------------------------------- */

:root {
  --ink: #1f2328;
  --ink-soft: #4a5158;
  --rule: #dde3ea;
  --paper: #fbfcfe;
  --accent: #2b6ca3;
  --accent-light: #eaf4fb;
  --card-shadow: rgba(20, 60, 90, 0.1);
  --nav-h: 64px;
  --content-max: 760px;
  --font-serif: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--paper) 520px);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover { border-bottom-color: var(--accent); }

/* ---------------- Top nav ---------------- */

.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--accent-light) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.navbar__inner {
  width: 100%;
  max-width: 980px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.navbar__brand {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  border-bottom: none;
  white-space: nowrap;
}
.navbar__brand:hover { color: var(--accent); }

.navbar__links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.navbar__links::-webkit-scrollbar { display: none; }

.navbar__links a {
  color: var(--ink-soft);
  font-size: 0.92rem;
  font-weight: 500;
  border-bottom: none;
  white-space: nowrap;
  padding: 0.3rem 0;
  position: relative;
}
.navbar__links a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s ease;
}
.navbar__links a:hover { color: var(--accent); }
.navbar__links a:hover::after,
.navbar__links a.active::after { transform: scaleX(1); }
.navbar__links a.active { color: var(--accent); }

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

.main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 6rem;
}

section { margin-bottom: 3.25rem; }
section:last-of-type { margin-bottom: 2rem; }

.section-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

/* ---------------- Hero (index page) ---------------- */

.hero {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.hero__photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--accent-light);
  flex: none;
  border: 4px solid var(--accent-light);
}

.hero__name {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 700;
  margin: 0 0 1rem;
  line-height: 1.2;
}

.hero__tagline {
  font-size: 1rem;
  color: var(--ink-soft);
  margin: 0 0 0.9rem;
}

.hero__socials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  font-size: 0.9rem;
}
.hero__socials a {
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-bottom: none;
}
.hero__socials a:hover { color: var(--accent); }
.hero__socials svg { width: 14px; height: 14px; flex: none; }

.about { margin-bottom: 3.25rem; }
.about p { margin: 0 0 1rem; }
.about p:last-child { margin-bottom: 0; }

.news-scroll {
  height: 190px;
  overflow-y: scroll;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) transparent;
}
.news-scroll::-webkit-scrollbar { width: 8px; }
.news-scroll::-webkit-scrollbar-track { background: transparent; }
.news-scroll::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }
.news-scroll::-webkit-scrollbar-thumb:hover { background: var(--ink-soft); }

.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li { margin-bottom: 0.65rem; font-size: 0.95rem; padding-left: 0.85rem; border-left: 2px solid var(--rule); }
.news-list li:last-child { margin-bottom: 0; }
.news-date { color: var(--accent); font-weight: 600; margin-right: 0.4rem; white-space: nowrap; }

/* ---------------- Entries ---------------- */

.entry {
  margin-bottom: 1.1rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.entry:last-child { margin-bottom: 0; }
.entry:hover {
  border-color: var(--accent);
  box-shadow: 0 6px 16px var(--card-shadow);
  transform: translateY(-2px);
}

.entry--logo {
  display: flex;
  gap: 1rem;
}

.entry__logo-wrap {
  width: 64px;
  height: 64px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  overflow: hidden;
}
.entry__logo { max-width: 82%; max-height: 82%; object-fit: contain; }

.entry__body { flex: 1; min-width: 0; }

.entry__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.entry__title { font-weight: 600; font-size: 1.02rem; }

.entry__meta {
  font-size: 0.88rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.entry__subtitle {
  font-size: 0.92rem;
  color: var(--ink-soft);
  font-style: italic;
  margin: 0.15rem 0 0.5rem;
}

.entry ul { margin: 0.4rem 0 0; padding-left: 1.1rem; }
.entry li { margin-bottom: 0.3rem; font-size: 0.95rem; }
.entry li:last-child { margin-bottom: 0; }

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

.pub {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 1.1rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.pub:last-child { margin-bottom: 0; }
.pub:hover {
  border-color: var(--accent);
  box-shadow: 0 6px 16px var(--card-shadow);
  transform: translateY(-2px);
}
.pub__year {
  flex: 0 0 3.2rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
  padding-top: 0.15rem;
}
.pub__title { font-weight: 600; font-size: 0.98rem; margin-bottom: 0.2rem; }
.pub__authors { font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 0.25rem; }
.pub__authors strong { color: var(--ink); font-weight: 600; }
.pub__meta { font-size: 0.86rem; }
.pub__meta .venue { color: var(--accent); font-weight: 600; }
.pub__links a { margin-right: 0.75rem; font-size: 0.85rem; }

.todo {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #a15b00;
  background: #fff2df;
  border: 1px solid #f0d6a8;
  border-radius: 3px;
  padding: 0.05rem 0.4rem;
  margin-left: 0.4rem;
}

footer.page-footer {
  font-size: 0.82rem;
  color: var(--ink-soft);
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

/* ---------------- Emerging / entrance animation ---------------- */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: fadeInUp 0.7s cubic-bezier(.16, .8, .24, 1) both;
}
.reveal.d1 { animation-delay: 0s; }
.reveal.d2 { animation-delay: .1s; }
.reveal.d3 { animation-delay: .2s; }
.reveal.d4 { animation-delay: .3s; }
.reveal.d5 { animation-delay: .4s; }
.reveal.d6 { animation-delay: .5s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { animation: none; }
}

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

@media (max-width: 700px) {
  .navbar__inner { padding: 0 1rem; }
  .navbar__links { gap: 1rem; }
  .hero { flex-direction: column; align-items: flex-start; text-align: left; gap: 1.1rem; }
  .hero__photo { width: 140px; height: 140px; }
  .main { padding: 2.5rem 1.25rem 4rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7e4de;
    --ink-soft: #a8a49c;
    --rule: #2a2f36;
    --paper: #14181d;
    --accent: #6fb3e0;
    --accent-light: #1b2733;
    --card-shadow: rgba(0, 0, 0, 0.45);
  }
  .todo { background: #2a2214; border-color: #4a3a1c; color: #e0ab5f; }
}