/* =============================================
   NAVBAR
   ============================================= */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.1rem 0;
  background: rgba(10, 15, 30, 0.75);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid rgba(79, 142, 247, 0.1);
  transition: all var(--transition-normal);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: 1px;
}

.nav-logo span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 0.25rem;
}

.nav-links a {
  color: var(--color-text-light);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-heading);
  background: rgba(79, 142, 247, 0.1);
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.8rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(79, 142, 247, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(79, 142, 247, 0.45);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid rgba(79, 142, 247, 0.5);
}

.btn-outline:hover {
  background: rgba(79, 142, 247, 0.1);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  color: var(--color-primary);
}

.btn-gold {
  background: var(--gradient-gold);
  color: #0A0F1E;
  font-weight: 700;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(245, 200, 66, 0.4);
  color: #0A0F1E;
}

/* =============================================
   GLASS CARDS
   ============================================= */
.glass-card {
  background: var(--color-surface);
  border: var(--glass-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-4px);
  border: var(--glass-border-hover);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 0 1px rgba(79,142,247,0.1);
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  margin: 0 auto 2rem auto;
  position: relative;
  padding: 4px;
  background: linear-gradient(145deg, #4F8EF7, #F5C842);
  box-shadow: 0 0 0 4px rgba(79, 142, 247, 0.12), 0 8px 40px rgba(79, 142, 247, 0.25);
  animation: avatarPulse 4s ease-in-out infinite alternate;
}

.profile-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  border: 3px solid var(--color-bg);
}

@keyframes avatarPulse {
  0%   { box-shadow: 0 0 0 4px rgba(79,142,247,0.12), 0 8px 30px rgba(79,142,247,0.2); }
  100% { box-shadow: 0 0 0 8px rgba(79,142,247,0.06), 0 8px 55px rgba(27,79,216,0.3); }
}

/* =============================================
   STAT BADGES (hero metrics)
   ============================================= */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

.stat-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.85rem 1.5rem;
  background: rgba(79, 142, 247, 0.07);
  border: 1px solid rgba(79, 142, 247, 0.15);
  border-radius: 12px;
  min-width: 110px;
}

.stat-badge .stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-badge .stat-label {
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-text);
  font-weight: 500;
}

/* =============================================
   ABOUT SECTION
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  align-items: start;
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  background: rgba(79, 142, 247, 0.08);
  color: var(--color-text-light);
  border-radius: 6px;
  font-size: 0.82rem;
  border: 1px solid rgba(79, 142, 247, 0.15);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(79, 142, 247, 0.18);
  border-color: rgba(79, 142, 247, 0.4);
  color: var(--color-heading);
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* =============================================
   PROJECTS
   ============================================= */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.project-card p {
  flex-grow: 1;
  font-size: 0.93rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: var(--spacing-sm);
}

.tag {
  background: rgba(79, 142, 247, 0.08);
  color: var(--color-primary);
  padding: 0.2rem 0.7rem;
  border-radius: 5px;
  font-size: 0.78rem;
  border: 1px solid rgba(79, 142, 247, 0.2);
  font-weight: 500;
}

.featured-project {
  grid-column: 1 / -1;
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  background: linear-gradient(145deg, rgba(19, 29, 53, 0.9), rgba(10, 15, 30, 0.95));
  border-color: rgba(79, 142, 247, 0.3);
  position: relative;
  overflow: hidden;
}

.featured-project::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(79, 142, 247, 0.08), transparent 60%);
  pointer-events: none;
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid rgba(245,200,66,0.3);
  background: rgba(245,200,66,0.08);
  padding: 0.3rem 0.8rem;
  border-radius: 5px;
  margin-bottom: 0.8rem;
  width: fit-content;
}

.featured-content { flex: 1; z-index: 1; }

.featured-visual {
  flex: 0.9;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,0.6);
  border: 1px solid rgba(79, 142, 247, 0.15);
  display: flex;
}

/* Software Window Mockup */
.window-mockup {
  display: flex;
  flex-direction: column;
  background: #080C16;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(79, 142, 247, 0.2);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
  width: 100%;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.window-header {
  height: 38px;
  background: rgba(255, 255, 255, 0.03);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  border-bottom: 1px solid rgba(79, 142, 247, 0.15);
  flex-shrink: 0;
}

.window-dots {
  display: flex;
  gap: 6px;
  align-items: center;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.window-dot.close { background: #ff5f56; }
.window-dot.minimize { background: #ffbd2e; }
.window-dot.maximize { background: #27c93f; }

.window-title {
  color: var(--color-text-light);
  font-size: 0.75rem;
  font-family: var(--font-main);
  opacity: 0.65;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.window-tabs {
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.04);
  padding: 2px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.window-tab {
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: 0.7rem;
  font-family: var(--font-main);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.window-tab:hover {
  color: var(--color-heading);
  background: rgba(255, 255, 255, 0.05);
}

.window-tab.active {
  color: #fff;
  background: var(--gradient-primary);
  box-shadow: 0 2px 8px rgba(79, 142, 247, 0.3);
}

.window-content {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: radial-gradient(circle at center, #131D35 0%, #0A0F1E 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Default placeholder visual when video/gif is not present or loading */
.window-content::before {
  content: '\f3ed'; /* FontAwesome shield-halved icon hex code */
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: 3.5rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: absolute;
  z-index: 1;
  opacity: 0.25;
  transition: opacity var(--transition-normal);
}

.window-content::after {
  content: 'Image Steganography Suite';
  position: absolute;
  bottom: 2rem;
  font-size: 0.75rem;
  color: var(--color-text);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  z-index: 1;
  opacity: 0.4;
  font-weight: 600;
}

/* Hide fallback text and icon when media is loaded and active */
.window-content.has-media::before,
.window-content.has-media::after {
  opacity: 0;
  pointer-events: none;
}

.featured-media {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  z-index: 2;
  border: none;
  opacity: 0;
  transition: opacity 0.5s ease;
}

/* Class to fade in the media when fully loaded */
.featured-media.loaded {
  opacity: 1;
}

/* Glow and subtle lift on featured project hover */
.featured-project:hover .window-mockup {
  border-color: rgba(79, 142, 247, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 20px 50px rgba(79, 142, 247, 0.15);
}

@media (max-width: 900px) {
  .featured-project { flex-direction: column; }
}

/* =============================================
   PUBLICATIONS
   ============================================= */
.pub-list {
  list-style: none;
  margin-bottom: 2.5rem;
}

.pub-item {
  display: flex;
  gap: 1rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid rgba(79, 142, 247, 0.08);
  transition: background var(--transition-fast);
}

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

.pub-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(79, 142, 247, 0.12);
  border: 1px solid rgba(79, 142, 247, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 2px;
}

.pub-content { flex: 1; }

.pub-content strong { color: var(--color-heading); }

.pub-journal {
  font-style: italic;
  color: var(--color-text);
}

.pub-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(79, 142, 247, 0.1);
  border: 1px solid rgba(79, 142, 247, 0.2);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-top: 0.4rem;
  transition: all var(--transition-fast);
}

.pub-link:hover {
  background: rgba(79, 142, 247, 0.2);
  color: #fff;
}

.pdf-link {
  color: #E8A800;
  background: rgba(245, 200, 66, 0.08);
  border-color: rgba(245, 200, 66, 0.25);
}

.pdf-link:hover {
  background: rgba(245, 200, 66, 0.2);
  border-color: var(--color-accent);
  color: #0A0F1E;
}

.pub-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: #0A0F1E;
  background: var(--gradient-gold);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-left: 0.4rem;
  vertical-align: middle;
}

.pub-section-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(79, 142, 247, 0.15);
}

/* =============================================
   EDUCATION SECTION
   ============================================= */
.education-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.edu-card {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border: var(--glass-border);
  border-radius: var(--border-radius);
  transition: all var(--transition-normal);
}

.edu-card:hover {
  border-color: rgba(79, 142, 247, 0.3);
  transform: translateX(4px);
}

.edu-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
}

.edu-content { flex: 1; }

.edu-degree {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 0.25rem;
}

.edu-institution {
  font-size: 0.9rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.edu-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--color-text);
  margin-bottom: 0.6rem;
}

.edu-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.edu-highlight {
  font-size: 0.87rem;
  color: var(--color-text);
  line-height: 1.6;
  padding-left: 1rem;
  border-left: 2px solid rgba(245, 200, 66, 0.4);
}

.distinction-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #0A0F1E;
  background: var(--gradient-gold);
  padding: 0.25rem 0.75rem;
  border-radius: 5px;
  margin-top: 0.6rem;
}

/* =============================================
   SOCIAL LINKS / FOOTER
   ============================================= */
.footer {
  border-top: 1px solid rgba(79, 142, 247, 0.1);
  padding: 2.5rem 0 1.5rem;
  background: rgba(0,0,0,0.3);
}

.social-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  background: var(--color-surface);
  border: var(--glass-border);
  color: var(--color-text);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all var(--transition-normal);
  min-width: 72px;
  text-align: center;
}

.social-link i,
.social-link img {
  font-size: 1.4rem;
  width: 1.4rem;
  height: 1.4rem;
}

/* Brand-specific colors on hover */
.social-link:hover { transform: translateY(-3px); color: #fff; }
.social-link[aria-label="GitHub"]:hover        { background: #24292e; border-color: #555; }
.social-link[aria-label="Google Scholar"]:hover { background: #4285F4; border-color: #4285F4; }
.social-link[aria-label="ResearchGate"]:hover  { background: #00CCBB; border-color: #00CCBB; }
.social-link[aria-label="Scopus"]:hover        { background: #E9711C; border-color: #E9711C; }
.social-link[aria-label="ORCID"]:hover         { background: #A6CE39; border-color: #A6CE39; color: #000; }
.social-link[aria-label="Web of Science"]:hover{ background: #5E33BF; border-color: #5E33BF; }
.social-link[aria-label="Vidwan"]:hover        { background: #0066CC; border-color: #0066CC; }
.social-link[aria-label="Email"]:hover         { background: var(--gradient-primary); border-color: var(--color-primary); }

/* =============================================
   PUBLICATION IMPACT SUMMARIES
   ============================================= */
.pub-impact {
  font-size: 0.85rem;
  color: var(--color-text);
  line-height: 1.65;
  margin-top: 0.6rem;
  padding: 0.65rem 1rem;
  background: rgba(79, 142, 247, 0.05);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 6px 6px 0;
}

.pub-impact i {
  color: var(--color-accent);
  margin-right: 0.35rem;
}

/* =============================================
   BACK TO TOP BUTTON
   ============================================= */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-normal), transform var(--transition-normal), box-shadow var(--transition-fast);
  box-shadow: 0 4px 16px rgba(79, 142, 247, 0.35);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  box-shadow: 0 6px 24px rgba(79, 142, 247, 0.55);
  transform: translateY(-3px);
}