/* ============================================================
   SAIKAT MONDAL — ACADEMIC PORTFOLIO
   Matching mrinanksharma.net warm-cream aesthetic
   ============================================================ */

:root {
  --nav-h: 60px;
  --bg: #fdf0e6;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --text-primary: #111111;
  --text-secondary: #333333;
  --text-muted: #777777;
  --border: #e8d8c8;
  --border-light: #f0e4d6;
  --tag-bg: #f5e6d5;
  --tag-text: #5c3a1e;
  --tag-border: #e0c9b0;
  --link-color: #1a1a1a;
  --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --content-w: 960px;
  --radius: 4px;
  --shadow-card: 0 1px 2px rgba(92, 58, 30, 0.06), 0 5px 14px rgba(92, 58, 30, 0.10);
  --shadow-card-hover: 0 2px 5px rgba(92, 58, 30, 0.08), 0 12px 26px rgba(92, 58, 30, 0.16);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 24px); }
body {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-primary);
  background: var(--bg);
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ════════════════════════════════════════
   TOP NAVIGATION BAR
════════════════════════════════════════ */
.topnav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg);
  height: var(--nav-h);
  border: 1px solid #000;
}

.nav-inner {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-brand {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0;
}

.nav-brand:hover { opacity: 0.7; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-secondary);
  padding: 4px 12px;
  transition: color 0.15s;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* Hamburger — hidden on desktop */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 6px 8px;
  transition: color 0.15s;
  flex-shrink: 0;
}
.nav-toggle:hover { color: var(--text-primary); }

/* ════════════════════════════════════════
   HERO / PROFILE HEADER
════════════════════════════════════════ */
.hero {
  background: var(--bg);
  padding: 40px 0 64px;
}

.hero-inner {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 56px;
  align-items: center;
}

.profile-photo {
  width: 100%;
  max-width: 270px;
  height: auto;
  border-radius: 9px;
  display: block;
  margin: 0 auto;
}

.hero-bio {
  padding-top: 8px;
}

.hero-about {
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.hero-bio h1 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  line-height: 1.25;
  margin-bottom: 10px;
}

.hero-role {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.hero-dept {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.hero-links a {
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: #fff8f2;
  transition: all 0.18s;
  text-decoration: none;
}

.hero-links a i {
  font-size: 0.78rem;
  width: 13px;
  text-align: center;
  color: var(--text-muted);
  flex-shrink: 0;
}

.hero-links a:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: var(--tag-bg);
}

.hero-links a:hover i { color: var(--text-primary); }

.hero-link-unavailable {
  font-family: var(--font-sans);
  font-size: 0.76rem;
  color: #c8b8a8;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border: 1px solid var(--border-light);
  border-radius: 20px;
  cursor: default;
  text-decoration: line-through;
  text-decoration-color: #d8c8b8;
}

/* ════════════════════════════════════════
   MAIN CONTENT
════════════════════════════════════════ */
.main-content {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 40px 80px;
}

/* Section-only pages (no hero) */
.page-main { padding-top: 56px; }

/* ── SECTIONS ── */
.section {
  margin-bottom: 64px;
  padding-bottom: 64px;
  border-bottom: 1px solid var(--border);
}

.section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.section-title {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 28px;
  display: block;
}

/* In-content text */
.section > p,
#about-content p {
  font-family: var(--font-serif);
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.85;
  margin-bottom: 14px;
}
.section > p:last-of-type,
#about-content p:last-of-type { margin-bottom: 0; }

/* In-content links — dark with underline like reference */
.section a,
#about-content a,
.timeline-body a,
.pub-desc a {
  color: var(--link-color);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.section a:hover,
#about-content a:hover { opacity: 0.65; }

/* ── TAGS ── */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  padding: 2px 10px;
  border-radius: 20px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.6;
}

/* ════════════════════════════════════════
   TIMELINE (Education / Experience)
════════════════════════════════════════ */
.timeline { display: flex; flex-direction: column; }

.timeline-item {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 32px;
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-light);
}

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

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-right: 24px;
  border-right: 1px solid var(--border);
  position: relative;
}

.timeline-meta::after {
  content: '';
  position: absolute;
  right: -5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--text-muted);
}

.timeline-meta h3 {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.tl-degree {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.4;
}

.tl-period {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: 4px;
}

.tl-period i { font-size: 0.65rem; }

.tl-grade {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-style: italic;
}

.timeline-body {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.85;
  padding-top: 2px;
}

/* ════════════════════════════════════════
   NEWS
════════════════════════════════════════ */
.news-heading {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: none;
  color: #172033;               /* deep navy */
}

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

.news-item {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);   /* same thin divider as the rest of the site */
}

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

.news-date {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #7C8798;               /* muted gray-blue */
  padding-top: 3px;
  white-space: nowrap;
}

.news-body {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  color: #39424F;              /* dark slate — readable on cream, softer than the navy heading */
  line-height: 1.75;
}

.news-body strong {
  color: #1E3A8A;             /* deep blue — highlights paper / venue names */
  font-weight: 700;
}

@media (max-width: 720px) {
  .news-item { grid-template-columns: 1fr; gap: 4px; }
}

/* ════════════════════════════════════════
   PUBLICATIONS
════════════════════════════════════════ */
.pub-card {
  display: flex;
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-light);
}

.pub-card:first-child { padding-top: 0; }
.pub-card:last-child { border-bottom: none; padding-bottom: 0; }

/* Numbering — bold, dark black */
.pub-index {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  min-width: 28px;
  padding-top: 3px;
  flex-shrink: 0;
}

/* Teaser figure — an elevated white card that floats above the page.
   The plate is a fixed size so the column stays even however the source
   figures are proportioned; the figure is contained, never cropped. */
.pub-thumb {
  width: 200px;
  aspect-ratio: 4 / 3;
  flex-shrink: 0;
  align-self: flex-start;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  background: #fff;
  border: 1px solid rgba(92, 58, 30, 0.07);
  border-radius: 10px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}

.pub-thumb img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 3px;
}

/* Only the linked variant reacts to the pointer — it lifts further off the page */
a.pub-thumb:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

@media (prefers-reduced-motion: reduce) {
  .pub-thumb { transition: none; }
  a.pub-thumb:hover { transform: none; }
}

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

/* Author byline — the site owner's own name is emphasised */
.pub-authors {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 6px;
}

.pub-author-self {
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.55;
  margin-bottom: 6px;
}

.pub-venue {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 8px;
  display: flex;
  align-items: flex-start;
  gap: 6px;
  line-height: 1.55;
}

.pub-venue i {
  color: var(--text-muted);
  margin-top: 2px;
  flex-shrink: 0;
  font-style: normal;
}

.pub-desc {
  font-family: var(--font-serif);
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 8px;
}

/* Action buttons — Paper primary, Code secondary */
.pub-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }

/* Scoped under .pub-links so these beat the global `.section a` underline rule */
.pub-links .pub-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 3px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: all 0.18s;
}

.pub-links .pub-link i { font-size: 0.8rem; color: var(--text-muted); }

/* Outlined at rest — Paper and Code share the same treatment */
.pub-links .pub-link-primary,
.pub-links .pub-link-secondary {
  background: transparent;
  border-color: var(--text-primary);
  color: var(--text-secondary);
}

/* Hover — same warm tan as the profile page's email / LinkedIn / GitHub buttons */
.pub-links .pub-link:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: var(--tag-bg);
}
.pub-links .pub-link:hover i { color: var(--text-primary); }

/* ════════════════════════════════════════
   PROJECTS
════════════════════════════════════════ */
.project-card {
  padding: 24px 0;
  border-bottom: 1px solid var(--border-light);
}

.project-card:first-child { padding-top: 0; }
.project-card:last-child { border-bottom: none; padding-bottom: 0; }

.project-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.project-header h3 {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
}

.project-date {
  font-family: var(--font-sans);
  font-size: 0.73rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.project-card p {
  font-family: var(--font-serif);
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 8px;
}

/* ════════════════════════════════════════
   SKILLS
════════════════════════════════════════ */
.skills-table { display: flex; flex-direction: column; }

.skill-row {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}

.skill-row:last-child { border-bottom: none; }

.skill-cat {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  min-width: 105px;
  padding-top: 5px;
  flex-shrink: 0;
}

/* ════════════════════════════════════════
   CERTIFICATIONS
════════════════════════════════════════ */
.cert-list { display: flex; flex-direction: column; }

.cert-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}

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

.cert-icon {
  width: 32px;
  height: 32px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.cert-content { display: flex; flex-direction: column; gap: 3px; }

.cert-content strong {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cert-meta {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ════════════════════════════════════════
   FOOTER
════════════════════════════════════════ */
.site-footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 24px 40px;
  text-align: center;
}

.site-footer p {
  font-family: var(--font-sans);
  font-size: 0.76rem;
  color: var(--text-muted);
}
.site-footer a { color: var(--text-muted); text-decoration: underline; }
.site-footer a:hover { color: var(--text-primary); }

/* ════════════════════════════════════════
   RESPONSIVE — TABLET (≤ 960px)
════════════════════════════════════════ */
@media (max-width: 960px) {
  .nav-inner { padding: 0 24px; }
  .hero { padding: 32px 0 52px; }
  .hero-inner { padding: 0 24px; gap: 36px; }
  .main-content { padding: 0 24px 64px; }

  /* Give the text column back the room the full-size plate was taking */
  .pub-card { gap: 14px; }
  .pub-thumb { width: 150px; padding: 8px; }
  .pub-index { min-width: 22px; }
}

/* ════════════════════════════════════════
   RESPONSIVE — MOBILE (≤ 720px)
════════════════════════════════════════ */
@media (max-width: 720px) {
  .nav-toggle { display: flex; align-items: center; justify-content: center; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
    gap: 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  }

  .nav-links.open { display: flex; }

  .nav-links li a {
    padding: 11px 28px;
    font-size: 0.82rem;
    border-radius: 0;
    display: block;
    color: var(--text-secondary);
  }

  /* Hero stacks on mobile */
  .hero { padding: 28px 0 44px; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 20px;
  }

  .profile-photo {
    max-width: 220px;
    /* Square crop disabled - the photo keeps its natural aspect ratio.
       aspect-ratio: 1 / 1;
       object-fit: cover; */
  }

  .hero-bio h1 { font-size: 1.4rem; }

  .main-content { padding: 0 20px 52px; }
  .section { margin-bottom: 48px; padding-bottom: 48px; }

  .timeline-item { grid-template-columns: 1fr; gap: 10px; }
  .timeline-meta {
    border-right: none;
    border-left: 1px solid var(--border);
    padding-right: 0;
    padding-left: 14px;
  }
  .timeline-meta::after { right: auto; left: -5px; }

  /* Figure leads, then the number and text share a row — a stacked column
     would strand the "01" alone on a line of its own. */
  .pub-card { flex-wrap: wrap; gap: 12px 14px; }
  .pub-thumb {
    order: 0;
    flex: 0 0 100%;   /* a clamped basis would let the index share this line */
    max-width: none;
    /* Height-driven instead of ratio-driven: a full-width 4:3 plate runs ~270px
       tall on a phone and buries the title. The figure is centred in the band. */
    aspect-ratio: auto;
    height: 150px;
    padding: 8px;
  }
  .pub-index { order: 1; font-size: 1rem; min-width: 20px; padding-top: 2px; }
  .pub-content { order: 2; flex: 1 1 0; }
  .pub-title { font-size: 0.95rem; }
  .pub-authors { font-size: 0.8rem; }
  .pub-links { gap: 8px; }

  .project-header { flex-direction: column; gap: 4px; }

  .skill-row { flex-direction: column; gap: 8px; }
  .skill-cat { min-width: auto; padding-top: 0; }
}

@media (max-width: 440px) {
  .main-content { padding: 0 16px 40px; }
  .hero-inner { padding: 0 16px; }
  .hero-links { gap: 8px 14px; }

  .pub-card { gap: 10px 12px; }
  .pub-thumb { height: 130px; }
  .pub-links .pub-link { font-size: 0.72rem; padding: 3px 9px; }
}