/* ==========================================================================
   Faculty Website: Dr. Sarvesh Kumar Dubey
   Centre for Atmospheric Sciences, Indian Institute of Technology Delhi
   Design System & Modern Academic Styling
   ========================================================================== */

:root {
  --iitd-maroon: #8D1437;
  --iitd-maroon-dark: #680d27;
  --iitd-maroon-light: #ab2148;
  --iitd-navy: #0e2a47;
  --iitd-navy-dark: #07192c;
  --iitd-navy-light: #1b4976;
  --iitd-gold: #c99738;
  --iitd-gold-light: #fef8eb;
  --iitd-gold-dark: #a87922;

  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-secondary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-focus: #cbd5e1;

  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-white: #ffffff;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--iitd-navy-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--iitd-maroon);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   TOP INSTITUTIONAL BANNER
   ========================================================================== */
.iitd-topbar {
  background: linear-gradient(135deg, var(--iitd-maroon-dark) 0%, var(--iitd-maroon) 50%, #9e1c41 100%);
  color: var(--text-white);
  border-bottom: 3px solid var(--iitd-gold);
  position: relative;
  z-index: 50;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.iitd-topbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.5rem;
  gap: 1.5rem;
}

.iitd-brand-group {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.iitd-logo-badge {
  background: #ffffff;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  width: 72px;
  height: 72px;
}

.iitd-logo-badge img {
  width: 60px;
  height: 60px;
  object-fit: contain;
  display: block;
}

.iitd-titles {
  display: flex;
  flex-direction: column;
}

.iitd-hindi-name {
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  color: #ffeed3;
  font-weight: 500;
  line-height: 1.2;
}

.iitd-english-name {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  line-height: 1.25;
  color: #ffffff;
  text-transform: uppercase;
}

.iitd-dept-name {
  font-size: 0.92rem;
  font-weight: 500;
  color: #fce7eb;
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.iitd-dept-name .badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.iitd-topbar-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.top-pill-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

.top-pill-link:hover {
  background: #ffffff;
  color: var(--iitd-maroon-dark);
  border-color: #ffffff;
}

.top-pill-link.highlight {
  background: var(--iitd-gold);
  color: var(--iitd-navy-dark);
  border-color: var(--iitd-gold);
  font-weight: 600;
}

.top-pill-link.highlight:hover {
  background: #f1bf55;
  color: #000;
}

/* ==========================================================================
   NAVIGATION BAR
   ========================================================================== */
.main-nav-wrapper {
  background: var(--iitd-navy);
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 54px;
}

.nav-faculty-name {
  color: #ffffff;
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: 0.3px;
}

.nav-faculty-name:hover {
  color: var(--iitd-gold);
}

.nav-faculty-name .sub-role {
  font-size: 0.8rem;
  font-weight: 400;
  color: #94a3b8;
  display: inline-block;
  padding-left: 0.5rem;
  border-left: 1px solid #334155;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.25rem;
  height: 100%;
}

.nav-item {
  height: 100%;
  display: flex;
  align-items: center;
}

.nav-link {
  color: #cbd5e1;
  font-weight: 500;
  font-size: 0.88rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0.85rem;
  right: 0.85rem;
  height: 3px;
  background: var(--iitd-gold);
  border-radius: 2px 2px 0 0;
}

.nav-link .badge-count {
  background: var(--iitd-maroon);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  font-size: 1.25rem;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ==========================================================================
   HERO / PROFILE IDENTITY SECTION
   ========================================================================== */
.hero-section {
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 3rem 0 2.5rem;
}

.profile-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.profile-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  text-align: center;
  position: relative;
}

.photo-container {
  position: relative;
  width: 220px;
  height: 235px;
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  border: 4px solid #ffffff;
  outline: 2px solid var(--iitd-maroon);
}

.photo-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.profile-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: #ecfdf5;
  color: #065f46;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  border: 1px solid #a7f3d0;
}

.profile-status-badge::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
}

.quick-contact-list {
  list-style: none;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  text-align: left;
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quick-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  color: var(--text-muted);
}

.quick-contact-item strong {
  color: var(--text-main);
  min-width: 50px;
}

.quick-contact-item svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--iitd-maroon);
}

.profile-hero-content {
  display: flex;
  flex-direction: column;
}

.faculty-title-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--iitd-maroon);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

.faculty-title-tag::before {
  content: "";
  width: 18px;
  height: 3px;
  background: var(--iitd-maroon);
  border-radius: 2px;
}

.faculty-main-heading {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--iitd-navy);
  line-height: 1.15;
  margin-bottom: 0.5rem;
}

.faculty-designation {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.faculty-designation .tenure-note {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--iitd-maroon);
  background: var(--iitd-gold-light);
  border: 1px solid #f9dfad;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-left: 0.5rem;
  white-space: nowrap;
}

.faculty-affiliation {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.faculty-research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.research-tag {
  background: var(--bg-secondary);
  color: var(--iitd-navy);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition);
}

.research-tag:hover {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

/* Scholarly Identity Cards */
.scholar-badges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.scholar-badge-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  background: #ffffff;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.scholar-badge-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--iitd-navy-light);
}

.scholar-badge-card img, .scholar-badge-card svg {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex-shrink: 0;
}

.scholar-badge-info {
  display: flex;
  flex-direction: column;
}

.scholar-badge-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
}

.scholar-badge-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   MAIN CONTENT LAYOUT & SECTIONS
   ========================================================================== */
.main-content {
  flex: 1;
  padding: 2.5rem 0;
}

.section-wrapper {
  margin-bottom: 3.5rem;
  scroll-margin-top: 75px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

.section-header::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--iitd-maroon);
}

.section-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--iitd-navy);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.section-title svg {
  color: var(--iitd-maroon);
}

.section-header-action {
  font-size: 0.88rem;
  font-weight: 600;
}

/* Cards & Content blocks */
.content-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.content-card:hover {
  box-shadow: var(--shadow-md);
}

.prose-text {
  font-size: 1.02rem;
  line-height: 1.8;
  color: #334155;
  text-align: justify;
}

.prose-text p {
  margin-bottom: 1.25rem;
}

.prose-text p:last-child {
  margin-bottom: 0;
}

/* tropX Lab Highlight Banner */
.tropx-banner-card {
  background: linear-gradient(135deg, #0d233a 0%, #173b5c 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 220px 1fr auto;
  gap: 2rem;
  align-items: center;
  box-shadow: var(--shadow-lg);
  margin-top: 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.tropx-logo-box {
  background: #ffffff;
  padding: 12px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tropx-logo-box img {
  max-height: 120px;
  width: auto;
  object-fit: contain;
}

.tropx-content h3 {
  font-size: 1.45rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tropx-content h3 .tag {
  background: var(--iitd-gold);
  color: var(--iitd-navy-dark);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  font-weight: 700;
}

.tropx-content p {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.6;
}

.btn-tropx {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #ffffff;
  color: var(--iitd-navy);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  white-space: nowrap;
  transition: var(--transition);
}

.btn-tropx:hover {
  background: var(--iitd-gold);
  color: var(--iitd-navy-dark);
  transform: translateY(-2px);
}

/* ==========================================================================
   BIOSKETCH & TIMELINES
   ========================================================================== */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.subsection-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--iitd-navy);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.subsection-title svg {
  color: var(--iitd-maroon);
}

/* Area of interest cards */
.interest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.interest-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--iitd-maroon);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: var(--transition);
}

.interest-card:hover {
  transform: translateX(4px);
  border-left-color: var(--iitd-gold);
  box-shadow: var(--shadow-md);
}

.interest-icon {
  background: #fdf2f4;
  color: var(--iitd-maroon);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.interest-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.interest-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Modern Timelines */
.timeline {
  position: relative;
  padding-left: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  background: #e2e8f0;
}

.timeline-item {
  position: relative;
}

.timeline-dot {
  position: absolute;
  top: 5px;
  left: -2rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--iitd-maroon);
  box-shadow: 0 0 0 2px rgba(141, 20, 55, 0.15);
}

.timeline-dot.gold {
  border-color: var(--iitd-gold);
  box-shadow: 0 0 0 2px rgba(201, 151, 56, 0.2);
}

.timeline-content {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.timeline-content:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

.timeline-period {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--iitd-maroon);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.25rem;
  display: inline-block;
}

.timeline-role {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.timeline-place {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   PUBLICATIONS SECTION & INTERACTIVE CONTROLS
   ========================================================================== */
.pub-toolbar {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.pub-filters {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.pub-filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
}

.pub-filter-btn:hover {
  background: #e2e8f0;
}

.pub-filter-btn.active {
  background: var(--iitd-navy);
  color: #ffffff;
  border-color: var(--iitd-navy);
}

.pub-search-box {
  position: relative;
  min-width: 260px;
  flex: 1;
  max-width: 360px;
}

.pub-search-box input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  outline: none;
  transition: var(--transition);
}

.pub-search-box input:focus {
  border-color: var(--iitd-navy);
  box-shadow: 0 0 0 3px rgba(14, 42, 71, 0.1);
}

.pub-search-box svg {
  position: absolute;
  top: 50%;
  left: 0.85rem;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 16px;
  height: 16px;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.pub-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 1.25rem;
  transition: var(--transition);
}

.pub-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.pub-index {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--iitd-maroon);
  background: #fdf2f4;
  height: 44px;
  width: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.pub-body {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.pub-meta-top {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.2rem;
  flex-wrap: wrap;
}

.pub-year-badge {
  background: var(--iitd-gold-light);
  color: var(--iitd-gold-dark);
  border: 1px solid #f8e1b4;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.pub-type-badge {
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #dbeafe;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--iitd-navy);
  line-height: 1.45;
}

.pub-authors {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.5;
}

.pub-authors strong {
  color: var(--iitd-maroon);
  font-weight: 700;
}

.pub-venue {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
}

.pub-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.pub-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: #ffffff;
  color: var(--iitd-navy);
  transition: var(--transition);
}

.pub-link-btn:hover {
  background: var(--iitd-navy);
  color: #ffffff;
  border-color: var(--iitd-navy);
}

/* ==========================================================================
   SPONSORED RESEARCH PROJECTS
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  border-top: 4px solid var(--iitd-maroon);
  transition: var(--transition);
}

.project-card.ongoing {
  border-top-color: #10b981;
}

.project-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.project-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  width: fit-content;
}

.project-status.ongoing {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.project-status.completed {
  background: #f1f5f9;
  color: #475569;
  border: 1px solid #cbd5e1;
}

.project-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--iitd-navy);
  line-height: 1.4;
  margin-bottom: 1rem;
}

.project-details {
  list-style: none;
  font-size: 0.88rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 0.85rem;
  margin-top: auto;
}

.project-detail-item {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
}

.project-detail-label {
  color: var(--text-muted);
  font-weight: 500;
}

.project-detail-val {
  font-weight: 600;
  color: var(--text-main);
  text-align: right;
}

/* ==========================================================================
   RESEARCH GROUP / STUDENTS
   ========================================================================== */
.students-tabs {
  margin-top: 1.5rem;
}

.students-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.student-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: var(--transition);
}

.student-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.student-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--iitd-navy) 0%, var(--iitd-navy-light) 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.student-avatar.graduated {
  position: relative;
  box-shadow: 0 0 0 2px var(--iitd-gold);
}

.student-avatar .avatar-crown {
  position: absolute;
  top: -13px;
  left: 50%;
  width: 20px;
  height: 14px;
  transform: translateX(-50%) rotate(-12deg);
  fill: var(--iitd-gold);
  stroke: var(--iitd-gold-dark);
  stroke-width: 1;
  filter: drop-shadow(0 1px 1px rgba(0,0,0,0.2));
}

.student-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.student-info .student-joined {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--iitd-maroon);
  margin-bottom: 0.25rem;
}

.student-info .student-topic {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   COURSES & TEACHING
   ========================================================================== */
.courses-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.course-year-block {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.course-year-header {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--iitd-maroon);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.course-cards-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.course-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.course-code-badge {
  background: var(--iitd-navy);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.course-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.contact-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.contact-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--iitd-navy);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-details-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: #fdf2f4;
  color: var(--iitd-maroon);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item-info h5 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.contact-item-info p, .contact-item-info a {
  font-size: 1rem;
  color: var(--text-main);
  font-weight: 500;
}

.copy-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  margin-left: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.copy-btn:hover {
  background: var(--iitd-navy);
  color: #fff;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: var(--iitd-navy-dark);
  color: #cbd5e1;
  padding: 3rem 0 1.5rem;
  border-top: 4px solid var(--iitd-maroon);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}

.footer-brand img {
  width: 64px;
  height: 64px;
  background: #ffffff;
  padding: 4px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.footer-brand h4 {
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.5;
  color: #94a3b8;
}

.footer-column h5 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--iitd-gold);
  padding-bottom: 0.35rem;
  display: inline-block;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.88rem;
}

.footer-links a {
  color: #94a3b8;
}

.footer-links a:hover {
  color: #ffffff;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid #1e3a5f;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: #64748b;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 992px) {
  .profile-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .profile-card {
    max-width: 420px;
    margin: 0 auto;
  }

  .grid-2col, .contact-grid {
    grid-template-columns: 1fr;
  }

  .tropx-banner-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .tropx-logo-box {
    margin: 0 auto;
  }

  .btn-tropx {
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .iitd-topbar-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .iitd-topbar-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.25rem;
  }

  .mobile-menu-btn {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 54px;
    left: 0;
    right: 0;
    background: var(--iitd-navy-dark);
    flex-direction: column;
    height: auto;
    padding: 1rem;
    border-top: 1px solid #1e3a5f;
    box-shadow: var(--shadow-xl);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-item {
    width: 100%;
    height: auto;
  }

  .nav-link {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .faculty-main-heading {
    font-size: 1.85rem;
  }

  .pub-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .pub-search-box {
    max-width: 100%;
  }

  .pub-card {
    grid-template-columns: 1fr;
  }

  .pub-index {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }
}