/* ==========================================================================
   CSS Variables & Design Tokens (Dark & Light Theme)
   ========================================================================== */
:root {
  /* Common Palette - BASIL Green Theme */
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-glow: rgba(16, 185, 129, 0.35);
  --secondary: #22c55e;
  --accent: #14b8a6;
  --success: #10b981;
  --warning: #f59e0b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s ease;

  /* Layout */
  --container-max: 1140px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(16, 185, 129, 0.4);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --nav-bg: rgba(11, 15, 25, 0.85);
  --glow-1: rgba(16, 185, 129, 0.14);
  --glow-2: rgba(34, 197, 94, 0.12);
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

/* Light Theme */
[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(16, 185, 129, 0.4);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --nav-bg: rgba(248, 250, 252, 0.85);
  --glow-1: rgba(16, 185, 129, 0.10);
  --glow-2: rgba(34, 197, 94, 0.08);

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 24px rgba(0, 0, 0, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Background Ambient Glows */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow-1 {
  width: 500px;
  height: 500px;
  background: var(--glow-1);
  top: -100px;
  right: -100px;
}

.bg-glow-2 {
  width: 600px;
  height: 600px;
  background: var(--glow-2);
  bottom: 10%;
  left: -150px;
}

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

.section {
  padding: 6rem 0;
  position: relative;
  z-index: 1;
}

/* Typography & Utilities */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
}

p {
  color: var(--text-secondary);
}

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

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Section Headers */
.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  letter-spacing: 0.05em;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
  backdrop-filter: blur(10px);
}

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

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.nav-logo {
  font-family: var(--font-mono);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  text-decoration: none;
}

.logo-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-fullname {
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1;
  font-family: var(--font-sans);
}


.nav-list {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-base);
  border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.theme-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: rotate(15deg);
}

[data-theme="dark"] .sun-icon {
  display: inline-block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: inline-block;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.hamburger-bar {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-base);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  min-height: calc(100vh - 4.5rem);
  display: flex;
  align-items: center;
  padding-top: 3rem;
  padding-bottom: 5rem;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 4rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}


.hero-description {
  font-size: 1.1rem;
  max-width: 520px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

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

.social-link {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.15rem;
  transition: all var(--transition-fast);
}

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

/* Avatar Card / Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.avatar-card {
  position: relative;
  width: 280px;
  height: 280px;
}

.avatar-glow {
  position: absolute;
  inset: -10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-lg);
  filter: blur(25px);
  opacity: 0.3;
}

.avatar-inner {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.avatar-icon {
  font-size: 5rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.basil-leaf-img {
  width: 220px;
  height: 220px;
  object-fit: contain;
  border-radius: var(--radius-md);
  filter: drop-shadow(0 6px 20px rgba(16, 185, 129, 0.35));
  transition: transform var(--transition-base), filter var(--transition-base);
}

.avatar-card:hover .basil-leaf-img {
  transform: scale(1.05) rotate(-1deg);
  filter: drop-shadow(0 10px 28px rgba(34, 197, 94, 0.55));
}

.avatar-badge {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  animation: float 4s ease-in-out infinite;
}

.avatar-badge-1 {
  top: -15px;
  right: -20px;
  color: var(--primary);
  animation-delay: 0s;
}

.avatar-badge-2 {
  bottom: 20px;
  left: -30px;
  color: var(--secondary);
  animation-delay: 1.5s;
}

.avatar-badge-3 {
  bottom: -15px;
  right: 10px;
  color: var(--warning);
  animation-delay: 2.5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-base);
}

.about-card:hover {
  border-color: var(--border-hover);
}

.about-card h3 {
  font-size: 1.4rem;
  margin-bottom: 1.25rem;
}

.main-about p {
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.stat-card {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.highlights-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.highlights-list li {
  display: flex;
  gap: 1rem;
}

.highlight-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.12);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.highlights-list h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.highlights-list p {
  font-size: 0.9rem;
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.skill-category-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.category-header i {
  font-size: 1.25rem;
  color: var(--primary);
}

.category-header h3 {
  font-size: 1.15rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.skill-pill i {
  color: var(--primary);
}

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

/* ==========================================================================
   Projects Section
   ========================================================================== */
.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 4px 10px var(--primary-glow);
}

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

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), border-color var(--transition-base), opacity var(--transition-base);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.project-card.hide {
  display: none;
}

.project-preview {
  height: 180px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.preview-gradient-1 {
  background: linear-gradient(135deg, #064e3b 0%, #10b981 100%);
}
.preview-gradient-2 {
  background: linear-gradient(135deg, #065f46 0%, #22c55e 100%);
}
.preview-gradient-3 {
  background: linear-gradient(135deg, #047857 0%, #34d399 100%);
}
.preview-gradient-neuro {
  background: #090d16;
}

.preview-white {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  height: 210px;
}

.project-preview-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.5rem;
  transition: transform var(--transition-base);
}

.project-card:hover .project-preview-img {
  transform: scale(1.04);
}

.project-preview-icon {
  font-size: 4rem;
  color: rgba(255, 255, 255, 0.4);
  transition: transform var(--transition-base);
}

.project-card:hover .project-preview-icon {
  transform: scale(1.1);
}

.project-links-overlay {
  position: absolute;
  inset: 0;
  background: rgba(11, 15, 25, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.project-card:hover .project-links-overlay {
  opacity: 1;
}

.project-link-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #ffffff;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: transform var(--transition-fast);
}

.project-link-icon:hover {
  transform: scale(1.15);
}

.project-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.project-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(16, 185, 129, 0.12);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.project-external-links {
  display: flex;
  gap: 0.75rem;
}

.project-external-links a {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.project-external-links a:hover {
  color: var(--primary);
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

.project-description {
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

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

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Experience / Timeline Section
   ========================================================================== */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-left: 55px;
  margin-bottom: 2.5rem;
}

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

.timeline-dot {
  position: absolute;
  left: 13px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-main);
  border: 3px solid var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
  z-index: 2;
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-base);
}

.timeline-content:hover {
  border-color: var(--border-hover);
}

.timeline-date {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.4rem;
}

.timeline-title {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.timeline-subtitle {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.timeline-desc {
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

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

.timeline-tags span {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-base);
}

.contact-card:hover {
  border-color: var(--border-hover);
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.12);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.contact-card h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.contact-card a,
.contact-card span {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
}

.contact-card a:hover {
  color: var(--primary);
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1.1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.btn-submit {
  width: 100%;
  padding: 1rem;
  font-size: 1rem;
  margin-top: 0.5rem;
}

.form-status {
  margin-top: 0.5rem;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  display: none;
  text-align: center;
}

.form-status.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  position: relative;
  z-index: 1;
}

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

.footer-logo {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-mono);
  display: inline-block;
  margin-bottom: 0.4rem;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.back-to-top {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.back-to-top:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* ==========================================================================
   Research Pillars Section
   ========================================================================== */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.pillar-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.pillar-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(34, 197, 94, 0.15));
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.pillar-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.pillar-card p {
  font-size: 0.92rem;
  line-height: 1.6;
  flex-grow: 1;
}

.pillar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.25rem;
}

.pillar-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  color: var(--primary);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

/* ==========================================================================
   Publications Section
   ========================================================================== */
.pub-scholar-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.pub-scholar-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.pub-summary-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.pub-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: all var(--transition-base);
}

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

.pub-stat-val {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  display: block;
}

.pub-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 0.25rem;
}

.pub-controls-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.pub-search-box {
  position: relative;
  max-width: 550px;
  margin: 0 auto;
  width: 100%;
}

.pub-search-box i {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
}

.pub-search-input {
  width: 100%;
  padding: 0.85rem 1.1rem 0.85rem 2.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.pub-search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

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

.publication-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
  position: relative;
}

.publication-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.publication-card.hide {
  display: none;
}

.pub-meta-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

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

.pub-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.pub-badge-year {
  background: rgba(16, 185, 129, 0.12);
  color: var(--primary);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.pub-badge-first-author {
  background: rgba(16, 185, 129, 0.12);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.pub-badge-journal {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.pub-citation-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.pub-citation-badge.high-citation {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(245, 158, 11, 0.15));
  color: #fb923c;
  border-color: rgba(251, 146, 60, 0.4);
  box-shadow: 0 0 12px rgba(251, 146, 60, 0.2);
}

.pub-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  line-height: 1.5;
}

.pub-authors .author-me {
  color: var(--primary);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.pub-journal-venue {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.pub-journal-venue span {
  font-style: normal;
  font-weight: 600;
  color: var(--text-secondary);
}

.pub-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}

.pub-tag {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.pub-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.pub-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pub-btn:hover {
  background: var(--bg-card-hover);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.pub-btn i {
  font-size: 0.85rem;
}

/* Toast Alert for Copy */
.toast-msg {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-base);
  pointer-events: none;
}

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

.toast-msg i {
  color: var(--success);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .social-links {
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 4.5rem;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    transform: translateY(-150%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
  }

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

  .nav-list {
    flex-direction: column;
    gap: 1.25rem;
    align-items: flex-start;
  }

  .nav-link {
    font-size: 1.1rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }

  .pi-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .team-photo-wrap {
    margin: 0 auto;
  }

  .team-links {
    justify-content: center;
  }
}

/* ==========================================================================
   Team Section
   ========================================================================== */
.team-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}

/* PI Card */
.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  overflow: hidden;
}

.team-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
}

.pi-card {
  display: flex;
  gap: 2rem;
  padding: 2rem;
  align-items: flex-start;
}

.team-photo-wrap {
  flex-shrink: 0;
  width: 160px;
  height: 200px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

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

.team-info {
  flex: 1;
}

.team-role-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.6rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.team-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.team-affil {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.team-affil i {
  color: var(--primary);
  margin-right: 0.4rem;
}

.team-bio {
  margin-bottom: 1.25rem;
}

.team-bio p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 0.75rem;
}

.team-bio p:last-child {
  margin-bottom: 0;
}

.team-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.team-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.35rem 1rem;
  transition: all var(--transition-fast);
}

.team-link:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* Join Us Card */
.join-card {
  padding: 2.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
}

.join-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 0.5rem;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
}

.join-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.join-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   News Section
   ========================================================================== */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all var(--transition-base);
  position: relative;
}

.news-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.news-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.news-date {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
}

.news-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.news-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.news-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}