/* ================================================
   DIPANKAR SRIRAG — Personal Academic Website
   ================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:           #ffffff;
  --text:         #1c1c1e;
  --text-muted:   #58585e;
  --accent:       #0057b8;
  --accent-hover: #003d8f;
  --border:       #e4e4e8;
  --bg-subtle:    #f5f5f7;
  --max-w:        720px;
  --font:         -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:         "SF Mono", "Fira Code", "Consolas", monospace;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Typography ──────────────────────────────── */

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

p {
  margin-bottom: 0.9em;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

code, pre {
  font-family: var(--mono);
  font-size: 0.875em;
}

code {
  background: var(--bg-subtle);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
}

/* ─── Layout ──────────────────────────────────── */

main {
  flex: 1;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

/* ─── Navigation ──────────────────────────────── */

nav {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.015em;
}

.nav-brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
  padding: 0.3rem 0.55rem;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--bg-subtle);
  text-decoration: none;
}

/* ─── Footer ──────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ─── Home: Profile ───────────────────────────── */

.profile {
  display: grid;
  grid-template-columns: 148px 1fr;
  gap: 2.5rem;
  align-items: start;
  padding: 2.75rem 0 3rem;
}

.profile-photo img {
  width: 148px;
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: center top;
  border-radius: 6px;
  display: block;
}

.profile-info h1 {
  font-size: 1.55rem;
  letter-spacing: -0.03em;
  margin-bottom: 0.2rem;
}

.profile-role {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
  line-height: 1.5;
}

.profile-bio {
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.8;
}

.profile-bio a {
  font-weight: 500;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.1rem;
  margin-top: 1.25rem;
}

.social-link {
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.social-link:hover {
  background: var(--bg-subtle);
  color: var(--accent);
  text-decoration: none;
}

.social-sep {
  color: var(--border);
  font-size: 0.8rem;
  padding: 0 0.05rem;
  user-select: none;
}

/* ─── Home: Sections ──────────────────────────── */

.home-section {
  padding-top: 2rem;
  margin-bottom: 2rem;
  border-top: 1px solid var(--border);
}

.section-label {
  font-size: 0.675rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

/* ─── News ────────────────────────────────────── */

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

.news-item {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 1.25rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  align-items: baseline;
}

.news-item:first-child {
  padding-top: 0;
}

.news-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.news-date {
  color: var(--text-muted);
  font-size: 0.75rem;
  white-space: nowrap;
}

.news-text {
  color: var(--text);
  line-height: 1.65;
}

.news-text p {
  margin: 0;
}

/* ─── Publications ────────────────────────────── */

.pub-list {
  display: flex;
  flex-direction: column;
}

.pub-entry {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.pub-entry:first-child {
  padding-top: 0;
}

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

.pub-title {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 0.3rem;
  color: var(--text);
}

.pub-title a {
  color: var(--text);
  font-weight: 500;
}

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

.pub-authors {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  line-height: 1.5;
}

.pub-authors .self {
  color: var(--text);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 2px;
}

.pub-venue {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.pub-venue .venue-name {
  color: var(--accent);
  font-weight: 500;
}

.pub-note {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.pub-links {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.pub-link {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.pub-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0, 87, 184, 0.04);
  text-decoration: none;
}

/* Publications page: section headings */

.pub-section-heading {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  padding-top: 0;
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--text);
  margin-bottom: 0;
}

.pub-section-heading--spaced {
  margin-top: 3.5rem;
  padding-top: 0;
}

/* Publications page: year groups */

.pub-year-group + .pub-year-group {
  margin-top: 0;
}

.pub-year-heading {
  font-size: 0.675rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--border);
  margin-bottom: 0;
}

.pub-year-group:first-child .pub-year-heading {
  border-top: none;
  padding-top: 1rem;
}

/* Publication entry left accents */

.pub-section--preprint .pub-entry,
.pub-section--published .pub-entry {
  padding-left: 0.9rem;
  border-left: 2px solid transparent;
  transition: border-color 0.15s;
}

.pub-section--preprint .pub-entry {
  border-left-color: var(--border);
}

.pub-section--preprint .pub-entry:hover,
.pub-section--published .pub-entry:hover {
  border-left-color: var(--accent);
}

/* Badges */

.badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  vertical-align: middle;
  margin-left: 0.4rem;
}

.badge-preprint {
  color: #92400e;
  background: #fef3c7;
  border: 1px solid #fcd34d;
}

/* ─── BibTeX cite box ─────────────────────────── */

.pub-cite {
  display: inline-block;
}

.pub-cite > summary {
  list-style: none;
  cursor: pointer;
}

.pub-cite > summary::-webkit-details-marker {
  display: none;
}

.pub-cite-box {
  position: relative;
  margin-top: 0.75rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.1rem 1.1rem;
  width: min(540px, 92vw);
  cursor: pointer;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.pub-cite-box:hover {
  border-color: #c0cfe8;
  background: #f0f4fb;
  box-shadow: 0 2px 12px rgba(0, 87, 184, 0.06);
}

.pub-cite-pre {
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.75;
  white-space: pre;
  overflow-x: auto;
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: var(--text-muted);
}

/* BibTeX token colours */
.bib-at    { color: var(--accent); font-weight: 600; }
.bib-key   { color: #b45309; }
.bib-field { color: var(--text); font-weight: 500; }
.bib-val   { color: #16a34a; }
.bib-num   { color: #b45309; }

.pub-cite-toast {
  position: absolute;
  bottom: 0.65rem;
  right: 0.85rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--accent);
  opacity: 0;
  transform: translateY(3px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}

.pub-cite-toast--show {
  opacity: 1;
  transform: translateY(0);
}

/* ─── See All ─────────────────────────────────── */

.see-all {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  display: inline-block;
  margin-top: 0.75rem;
}

.see-all:hover {
  color: var(--accent-hover);
}

/* ─── Page: Generic ───────────────────────────── */

.page-header {
  padding-bottom: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 0.4rem;
}

.page-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 540px;
  margin-bottom: 0;
}

.page-content {
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.page-content h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}

.page-content ul,
.page-content ol {
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
}

.page-content li {
  margin-bottom: 0.3rem;
}

.page-content strong {
  font-weight: 600;
}

.page-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.75rem 0;
}

/* ─── Data Section ────────────────────────────── */

.data-list {
  display: flex;
  flex-direction: column;
}

.data-entry {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.data-entry:first-child {
  padding-top: 0;
}

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

.data-title {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

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

.data-title a:hover {
  color: var(--accent);
  text-decoration: none;
}

.data-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.data-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.data-tag {
  font-size: 0.68rem;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* ─── Teaching ───────────────────────────────── */

.teaching-list {
  display: flex;
  flex-direction: column;
}

.teaching-year-group {
  margin-bottom: 0;
}

.teaching-year-heading {
  font-size: 0.675rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--border);
  margin-bottom: 0;
}

.teaching-year-group:first-child .teaching-year-heading {
  border-top: none;
  padding-top: 0;
}

.teaching-entries {
  display: flex;
  flex-direction: column;
}

.teaching-entry {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1.25rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
  transition: border-left-color 0.15s;
  padding-left: 0.9rem;
  border-left: 2px solid transparent;
}

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

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

.teaching-code {
  font-size: 0.775rem;
  font-weight: 600;
  font-family: var(--mono);
  color: var(--text-muted);
  letter-spacing: 0.02em;
  padding-top: 0.15rem;
}

.teaching-details {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.teaching-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
}

.teaching-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}

.teaching-role {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.teaching-institution {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}

.teaching-term {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  font-family: var(--mono);
}

.teaching-feedback {
  font-size: 0.75rem;
  font-weight: 600;
  color: #16a34a;
  margin-left: 0.2rem;
}

.teaching-feedback-label {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.725rem;
}

@media (max-width: 620px) {
  .teaching-entry {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
}

/* ─── Hobbies / Gallery ───────────────────────── */

.gallery-intro {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 600px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 0.6rem;
}

.gallery-item {
  overflow: hidden;
  border-radius: 5px;
  background: var(--bg-subtle);
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease, opacity 0.2s;
}

.gallery-item:hover img {
  transform: scale(1.03);
  opacity: 0.92;
}

.gallery-caption {
  font-size: 0.73rem;
  color: var(--text-muted);
  padding: 0.35rem 0.6rem 0.5rem;
  text-align: center;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

/* ─── Generic List Page ───────────────────────── */

.list-page {
  display: flex;
  flex-direction: column;
}

.list-item {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}

.list-item:first-child {
  padding-top: 0;
}

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

.list-date {
  font-size: 0.775rem;
  color: var(--text-muted);
  padding-top: 0.1rem;
}

.list-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.2rem;
  line-height: 1.4;
}

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

.list-title a:hover {
  color: var(--accent);
  text-decoration: none;
}

.list-summary {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ─── Inline link class (used in news content) ── */

a.link {
  color: var(--accent);
  font-weight: 500;
}

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

/* ─── Responsive ──────────────────────────────── */

@media (max-width: 620px) {
  .profile {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 0 2.25rem;
  }

  .profile-photo {
    display: flex;
  }

  .profile-photo img {
    width: 110px;
  }

  .profile-info h1 {
    font-size: 1.3rem;
  }

  .nav-inner {
    height: auto;
    padding: 0.65rem 1.5rem;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .nav-links {
    gap: 0;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .list-item {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}