/* ==========================================================================
   Premium Personal Portfolio Stylesheet
   Designed by Antigravity (Google DeepMind)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Variables & Theme Configuration
   -------------------------------------------------------------------------- */
:root {
  /* Font Families */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Theme: Dark Mode (Default) */
  --bg-primary: #090d16;
  --bg-secondary: #111827;
  --bg-glass: rgba(17, 24, 39, 0.7);
  --bg-glass-hover: rgba(31, 41, 55, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(99, 102, 241, 0.4);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --primary: #6366f1; /* Indigo */
  --primary-rgb: 99, 102, 241;
  --secondary: #a855f7; /* Purple */
  --accent: #14b8a6; /* Teal */
  --accent-glow: rgba(20, 184, 166, 0.15);
  
  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.8);
  
  --glow-color-1: rgba(99, 102, 241, 0.18);
  --glow-color-2: rgba(168, 85, 247, 0.18);
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Theme: Light Mode Switch */
body.light-mode {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.75);
  --bg-glass-hover: rgba(241, 245, 249, 0.9);
  --border-color: rgba(0, 0, 0, 0.06);
  --border-color-hover: rgba(99, 102, 241, 0.3);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --primary: #4f46e5; /* Darker Indigo */
  --primary-rgb: 79, 70, 229;
  --secondary: #9333ea; /* Darker Purple */
  --accent: #0d9488; /* Darker Teal */
  --accent-glow: rgba(13, 148, 136, 0.1);
  
  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px -10px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.12);
  
  --glow-color-1: rgba(99, 102, 241, 0.08);
  --glow-color-2: rgba(168, 85, 247, 0.08);
}

/* --------------------------------------------------------------------------
   2. Reset & Global Styles
   -------------------------------------------------------------------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--secondary);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

ul {
  list-style: none;
}

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

/* --------------------------------------------------------------------------
   3. Decorative Components (Glow Blobs & Scrollbars)
   -------------------------------------------------------------------------- */
.bg-gradient-glow {
  position: fixed;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  z-index: -1;
  pointer-events: none;
  filter: blur(120px);
  opacity: 0.8;
  animation: float 20s infinite alternate;
}

.blob-1 {
  top: -10%;
  right: -10%;
  background: radial-gradient(circle, var(--glow-color-1) 0%, transparent 70%);
}

.blob-2 {
  bottom: -10%;
  left: -10%;
  background: radial-gradient(circle, var(--glow-color-2) 0%, transparent 70%);
  animation-delay: -5s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(5%, 5%) scale(1.1); }
  100% { transform: translate(-5%, -2%) scale(0.9); }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
  border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Selection Highlight */
::selection {
  background-color: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Glassmorphism Panel Helper */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-normal), background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-panel:hover {
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 15px -3px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -3px rgba(99, 102, 241, 0.6);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* Section Common Styles */
.section {
  padding: 8rem 0;
  position: relative;
}

.section-alt {
  background-color: rgba(17, 24, 39, 0.2);
}

body.light-mode .section-alt {
  background-color: rgba(241, 245, 249, 0.5);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-subtitle {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary);
  font-weight: 600;
  display: block;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.section-divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  margin: 1rem auto 0;
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(9, 13, 22, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

body.light-mode .header {
  background: rgba(248, 250, 252, 0.4);
}

.header.scrolled {
  padding: 0.5rem 0;
  background: rgba(9, 13, 22, 0.85);
  box-shadow: var(--shadow-sm);
}

body.light-mode .header.scrolled {
  background: rgba(255, 255, 255, 0.85);
}

.header-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: padding var(--transition-normal);
}

.header.scrolled .header-container {
  padding: 0.75rem 2rem;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.logo-dot {
  width: 10px;
  height: 10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary);
}

/* Nav Menu */
.nav-menu ul {
  display: flex;
  gap: 2.75rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.nav-link i {
  width: 16px;
  height: 16px;
  opacity: 0.8;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
}

body.light-mode .nav-link:hover,
body.light-mode .nav-link.active {
  background: rgba(99, 102, 241, 0.05);
}

/* Utilities (Theme Toggle & Mobile menu icon) */
.header-utils {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--primary);
  background: var(--bg-glass-hover);
  color: var(--primary);
}

.theme-toggle-btn .sun-icon {
  display: block;
}
.theme-toggle-btn .moon-icon {
  display: none;
}

body.light-mode .theme-toggle-btn .sun-icon {
  display: none;
}
body.light-mode .theme-toggle-btn .moon-icon {
  display: block;
}

.mobile-nav-toggle-btn {
  display: none;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-nav-toggle-btn .close-icon {
  display: none;
}

.mobile-nav-toggle-btn.active .menu-icon {
  display: none;
}
.mobile-nav-toggle-btn.active .close-icon {
  display: block;
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 4rem;
  width: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.badge-container {
  margin-bottom: 1.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(20, 184, 166, 0.1);
  border: 1px solid rgba(20, 184, 166, 0.25);
  color: var(--accent);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(20, 184, 166, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(20, 184, 166, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(20, 184, 166, 0); }
}

.hero-title {
  font-size: 4rem;
  font-weight: 850;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--text-primary) 20%, var(--text-secondary) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.75rem;
}

.hero-subtitle {
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 1.25rem;
}

.hero-tagline-wrap {
  font-size: 1.35rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  font-weight: 400;
  height: 2rem; /* Keep text flow stable */
}

.typewriter-text {
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 2px solid var(--secondary);
  padding-bottom: 2px;
}

.typewriter-cursor {
  color: var(--secondary);
  font-weight: 300;
  animation: blink 0.8s infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-social-links {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.social-icon-btn {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 6px 20px -8px var(--primary);
}

.social-icon-btn i {
  width: 20px;
  height: 20px;
}

.hero-cta-group {
  display: flex;
  gap: 1.5rem;
}

/* Hero Illustration (Avatar animations) */
.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.avatar-frame {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed var(--primary);
  opacity: 0.3;
}

.ring-1 {
  width: 360px;
  height: 360px;
  animation: rotateCW 35s linear infinite;
}

.ring-2 {
  width: 390px;
  height: 390px;
  border: 1.5px solid var(--secondary);
  border-style: dotted;
  opacity: 0.2;
  animation: rotateCCW 25s linear infinite;
}

.ring-3 {
  width: 330px;
  height: 330px;
  border: 2px solid var(--border-color);
  opacity: 0.15;
}

@keyframes rotateCW {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateCCW {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

.avatar-image {
  width: 300px;
  height: 300px;
  object-fit: cover;
  border-radius: 35% 65% 60% 40% / 45% 45% 55% 55%; /* Smooth blob shape */
  border: 4px solid var(--bg-secondary);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(99, 102, 241, 0.2);
  transition: all var(--transition-slow);
  animation: blobMorph 8s ease-in-out infinite alternate;
}

@keyframes blobMorph {
  0% { border-radius: 35% 65% 60% 40% / 45% 45% 55% 55%; }
  50% { border-radius: 50% 50% 30% 70% / 50% 60% 40% 50%; }
  100% { border-radius: 35% 65% 60% 40% / 45% 45% 55% 55%; }
}

/* Mouse Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: center;
}

.mouse {
  width: 26px;
  height: 42px;
  border: 2px solid var(--text-muted);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.mouse:hover {
  border-color: var(--primary);
}

.wheel {
  width: 4px;
  height: 8px;
  background-color: var(--primary);
  border-radius: 2px;
  animation: scrollDown 1.5s infinite;
}

@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}

/* --------------------------------------------------------------------------
   6. About Me Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 4rem;
  align-items: flex-start;
}

.about-card-left {
  position: sticky;
  top: 100px;
}

.profile-card {
  composes: glass-panel;
  padding: 2.25rem 2rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

.profile-card-header {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.profile-card-header h3 {
  font-size: 1.25rem;
  color: var(--primary);
}

.profile-info-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.profile-info-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.profile-info-list li i {
  width: 22px;
  height: 22px;
  color: var(--secondary);
  flex-shrink: 0;
  margin-top: 3px;
}

.profile-info-list li strong {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.profile-info-list li span {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
  word-break: break-word;
}

.about-content-right {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-greeting {
  font-size: 1.75rem;
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.about-bio,
.about-bio-detailed {
  font-size: 1.05rem;
  color: var(--text-secondary);
  text-align: justify;
}

.about-bio .link {
  font-weight: 600;
  border-bottom: 1px dashed var(--primary);
}

/* Research interests grid */
.research-interests {
  margin-top: 2rem;
}

.research-interests h4 {
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  border-left: 3px solid var(--primary);
  padding-left: 0.75rem;
}

.interests-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.interest-card {
  composes: glass-panel;
  padding: 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: all var(--transition-fast);
}

.interest-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  background-color: var(--bg-glass-hover);
}

.interest-card h3 {
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.interest-card h3::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary);
}

.interest-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   7. News Section (Timeline)
   -------------------------------------------------------------------------- */
.timeline-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 2rem;
}

.timeline-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 5px;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--primary), var(--secondary), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

/* Timeline dot */
.timeline-dot {
  position: absolute;
  left: -2.35rem;
  top: 1rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 3px solid var(--primary);
  z-index: 2;
  box-shadow: 0 0 10px var(--primary);
  transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
  background-color: var(--secondary);
  border-color: var(--secondary);
  transform: scale(1.3);
  box-shadow: 0 0 12px var(--secondary);
}

/* News Content Card */
.timeline-card {
  composes: glass-panel;
  padding: 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: all var(--transition-fast);
}

.timeline-card:hover {
  transform: translateX(5px);
  border-color: var(--border-color-hover);
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.timeline-date {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.12);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

body.light-mode .timeline-date {
  background: rgba(99, 102, 241, 0.06);
}

.timeline-title {
  font-size: 1.05rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.timeline-title b {
  font-weight: 600;
  color: var(--text-primary);
}

.timeline-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--primary);
  margin-top: 0.5rem;
  font-weight: 500;
}

.timeline-link i {
  width: 14px;
  height: 14px;
}

.timeline-link:hover {
  color: var(--secondary);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   8. Publications Section
   -------------------------------------------------------------------------- */
.pubs-filter-bar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

@media(min-width: 768px) {
  .pubs-filter-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* Realtime Search */
.search-input-wrapper {
  position: relative;
  flex-grow: 1;
  max-width: 500px;
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-clear-btn {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem;
  display: none;
  transition: color var(--transition-fast);
}

.search-clear-btn:hover {
  color: var(--text-primary);
}

.search-clear-btn i {
  width: 16px;
  height: 16px;
}

#pub-search {
  width: 100%;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.8rem 2.8rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-fast);
}

#pub-search:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
  background-color: var(--bg-glass-hover);
}

/* Category Filter Tabs */
.filter-tabs-wrapper {
  display: flex;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  padding: 0.35rem;
  border-radius: 12px;
  gap: 0.25rem;
  overflow-x: auto;
  align-self: flex-start;
}

.filter-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

/* Publications Metadata */
.pubs-meta-info {
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Publication Card */
.pub-card {
  composes: glass-panel;
  padding: 2rem;
  margin-bottom: 1.75rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pub-card:last-child {
  margin-bottom: 0;
}

.pub-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-color-hover);
}

.pub-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.pub-badge {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.badge-journal {
  background: rgba(20, 184, 166, 0.12);
  color: var(--accent);
  border: 1px solid rgba(20, 184, 166, 0.2);
}

.badge-conference {
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.badge-review {
  background: rgba(168, 85, 247, 0.12);
  color: var(--secondary);
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.pub-year {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pub-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-top: 0.25rem;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.pub-authors b {
  color: var(--text-primary);
  font-weight: 600;
}

.pub-venue {
  font-size: 0.9rem;
  font-weight: 500;
  font-style: italic;
  color: var(--text-muted);
}

.pub-note {
  font-size: 0.8rem;
  color: var(--accent);
  font-style: italic;
  margin-top: -0.25rem;
}

/* Pub Actions/Buttons */
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.pub-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  cursor: pointer;
}

body.light-mode .pub-link-btn {
  background: rgba(0, 0, 0, 0.02);
}

.pub-link-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--primary);
  color: var(--primary);
}

.pub-link-btn i {
  width: 14px;
  height: 14px;
}

/* --------------------------------------------------------------------------
   9. Academic Services Section
   -------------------------------------------------------------------------- */
.services-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.services-card {
  composes: glass-panel;
  padding: 3rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
}

.services-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.services-icon {
  width: 28px;
  height: 28px;
  color: var(--secondary);
}

.services-header h3 {
  font-size: 1.5rem;
  color: var(--text-primary);
}

.services-desc {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.services-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media(min-width: 600px) {
  .services-list {
    grid-template-columns: 1fr 1fr;
  }
}

.services-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

body.light-mode .services-list li {
  background: rgba(0, 0, 0, 0.01);
}

.services-list li:hover {
  border-color: var(--primary);
  color: var(--text-primary);
  background-color: var(--bg-glass-hover);
  transform: translateX(3px);
}

.services-list li::before {
  content: '✓';
  color: var(--accent);
  font-weight: bold;
}

/* --------------------------------------------------------------------------
   10. Footer Section
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 4rem 0;
  transition: background-color var(--transition-normal);
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

@media(min-width: 768px) {
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 400px;
}

.footer-right {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: left;
}

@media(min-width: 768px) {
  .footer-right {
    text-align: right;
  }
}

.footer-copy {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-attribution {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   11. Floating UI Controls (Back to Top & Modals)
   -------------------------------------------------------------------------- */
.back-to-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top-btn:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.back-to-top-btn i {
  width: 20px;
  height: 20px;
}

/* BibTeX Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(9, 13, 22, 0.7);
  backdrop-filter: blur(8px);
  z-index: 1100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.modal.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  width: 90%;
  max-width: 600px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
}

.modal.open .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.25rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.75rem;
  cursor: pointer;
  transition: color var(--transition-fast);
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
}

.modal-body pre {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  background-color: rgba(0, 0, 0, 0.1);
}

/* --------------------------------------------------------------------------
   12. Responsive Menu & Layout Fixes
   -------------------------------------------------------------------------- */
@media (max-width: 991px) {
  /* Hero section single column */
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
    padding-top: 2rem;
  }
  
  .hero-content {
    align-items: center;
    order: 2;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.5rem;
  }
  
  .hero-illustration {
    order: 1;
  }
  
  .avatar-frame {
    width: 260px;
    height: 260px;
  }
  
  .avatar-image {
    width: 240px;
    height: 240px;
  }
  
  .ring-1 { width: 280px; height: 280px; }
  .ring-2 { width: 300px; height: 300px; }
  .ring-3 { width: 260px; height: 260px; }

  /* About grid single column */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .about-card-left {
    position: static;
  }
}

@media (max-width: 767px) {
  .section {
    padding: 5rem 0;
  }
  
  .section-title {
    font-size: 2rem;
  }

  /* Hamburger Menu implementation */
  .mobile-nav-toggle-btn {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 999;
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .nav-menu ul {
    flex-direction: column;
    gap: 1.5rem;
  }

  .nav-link {
    font-size: 1.15rem;
    padding: 0.75rem 1rem;
    width: 100%;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    justify-content: center;
  }
  
  .services-card {
    padding: 1.5rem;
  }
  
  .pub-card {
    padding: 1.25rem;
  }
  
  .pub-title {
    font-size: 1.05rem;
  }
}
/* --------------------------------------------------------------------------
   13. Education & Skills Sections
   -------------------------------------------------------------------------- */
.about-extra-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  margin-top: 5rem;
  align-items: flex-start;
}

@media(max-width: 991px) {
  .about-extra-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

.subsection-title {
  font-size: 1.5rem;
  font-weight: 750;
  margin-bottom: 2rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.subsection-title i {
  color: var(--primary);
  width: 26px;
  height: 26px;
}

.edu-item {
  position: relative;
  padding-left: 1.75rem;
  border-left: 2px solid var(--border-color);
  margin-bottom: 2.5rem;
  transition: border-color var(--transition-fast);
}

.edu-item:last-child {
  margin-bottom: 0;
  border-left: 2px solid transparent; /* Hide bottom line */
}

.edu-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 2px solid var(--primary);
  transition: all var(--transition-fast);
}

.edu-item:hover::before {
  background-color: var(--secondary);
  border-color: var(--secondary);
  transform: scale(1.3);
}

.edu-item:hover {
  border-left-color: var(--primary);
}

.edu-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.edu-degree {
  font-size: 1.1rem;
  font-weight: 750;
  color: var(--text-primary);
}

.edu-period {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
}

.edu-institution {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.edu-details {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.edu-details b {
  color: var(--text-secondary);
}

/* Skills Badges Category blocks */
.skills-category-block {
  margin-bottom: 2rem;
}

.skills-category-block:last-child {
  margin-bottom: 0;
}

.skills-category-block h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.skills-badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-badge {
  padding: 0.45rem 0.9rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.skill-badge:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12);
  background: var(--bg-glass-hover);
}

/* --------------------------------------------------------------------------
   14. Experience & Training Section
   -------------------------------------------------------------------------- */
.experience-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: flex-start;
}

@media(max-width: 991px) {
  .experience-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

.subsection-title-icon {
  font-size: 1.5rem;
  font-weight: 750;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.subsection-title-icon i {
  color: var(--secondary);
  width: 26px;
  height: 26px;
}

.exp-item {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--border-color);
  margin-bottom: 3rem;
  transition: border-color var(--transition-fast);
}

.exp-item:last-child {
  margin-bottom: 0;
  border-left: 2px solid transparent;
}

.exp-item::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 3px solid var(--secondary);
  z-index: 2;
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.4);
  transition: all var(--transition-fast);
}

.exp-item:hover::before {
  background-color: var(--primary);
  border-color: var(--primary);
  transform: scale(1.3);
  box-shadow: 0 0 10px var(--primary);
}

.exp-item:hover {
  border-left-color: var(--secondary);
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.exp-role {
  font-size: 1.15rem;
  font-weight: 750;
  color: var(--text-primary);
}

.exp-period {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--secondary);
  background: rgba(168, 85, 247, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
}

.exp-company {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.exp-details {
  list-style: disc;
  margin-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.exp-details li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: justify;
}

/* Industrial Training Lists */
.training-item {
  composes: glass-panel;
  padding: 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 1.5rem;
  transition: all var(--transition-fast);
}

.training-item:last-child {
  margin-bottom: 0;
}

.training-item:hover {
  transform: translateX(5px);
  border-color: var(--secondary);
}

.training-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.training-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-primary);
}

.training-period {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.training-provider {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.training-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   15. Projects Section
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  composes: glass-panel;
  padding: 2.25rem 2rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
  transition: all var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
}

.project-info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.project-icon-box {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.08);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card:hover .project-icon-box {
  background: var(--primary);
  color: #ffffff;
}

.project-icon-box i {
  width: 20px;
  height: 20px;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-primary);
  line-height: 1.3;
}

.project-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  text-align: justify;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tag {
  font-size: 0.75rem;
  background: rgba(168, 85, 247, 0.08);
  color: var(--secondary);
  border: 1px solid rgba(168, 85, 247, 0.15);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-weight: 600;
}

.project-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  align-self: flex-start;
  transition: all var(--transition-fast);
}

.project-link-btn:hover {
  color: var(--secondary);
  transform: translateX(3px);
}

/* --------------------------------------------------------------------------
   16. Awards & Certifications
   -------------------------------------------------------------------------- */
.awards-certs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

@media(max-width: 991px) {
  .awards-certs-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

.award-item {
  composes: glass-panel;
  padding: 1.75rem 2rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  transition: all var(--transition-fast);
}

.award-item:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.award-trophy-box {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(251, 191, 36, 0.1);
  color: #fbbf24;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.award-trophy-box i {
  width: 22px;
  height: 22px;
}

.award-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.award-title {
  font-size: 1.1rem;
  font-weight: 750;
  color: var(--text-primary);
}

.award-issuer {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.award-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.award-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 0.25rem;
}

/* Certifications Grid */
.certs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media(min-width: 600px) {
  .certs-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.cert-card {
  composes: glass-panel;
  padding: 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.cert-card:hover {
  transform: translateY(-2px);
  border-color: var(--secondary);
}

.cert-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.cert-issuer {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--secondary);
}

.cert-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   17. Academic References
   -------------------------------------------------------------------------- */
.references-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

.reference-card {
  composes: glass-panel;
  padding: 2.5rem 2rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  overflow: hidden;
}

.reference-card::before {
  content: '"';
  position: absolute;
  right: 1.5rem;
  bottom: -1rem;
  font-size: 10rem;
  color: rgba(99, 102, 241, 0.05);
  font-family: serif;
  font-weight: bold;
  line-height: 1;
}

.reference-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.ref-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.ref-avatar-box {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

.ref-info {
  display: flex;
  flex-direction: column;
}

.ref-name {
  font-size: 1.2rem;
  font-weight: 750;
  color: var(--text-primary);
}

.ref-role {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
}

.ref-details {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.ref-dept,
.ref-inst {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.ref-email-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  align-self: flex-start;
  transition: all var(--transition-fast);
}

body.light-mode .ref-email-btn {
  background: rgba(0, 0, 0, 0.02);
}

.ref-email-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--primary);
  color: var(--primary);
}

.ref-email-btn i {
  width: 14px;
  height: 14px;
}