/* =====================================================
   Advanced Portfolio - Purple-Pink Gradient Theme
   Complete Styling with Glassmorphism & Animations
   ===================================================== */

/* ===== CSS VARIABLES ===== */
:root {
  /* Primary Colors - Purple/Pink Gradient */
  --primary: #667eea;
  --primary-dark: #5a67d8;
  --secondary: #764ba2;
  --accent: #f093fb;
  --accent-light: #f5d0fe;
  --success: #10b981;
  --warning: #f59e0b;
  --info: #4facfe;

  /* Dark Theme (Default) */
  --bg-primary: #0f0f23;
  --bg-secondary: #16213e;
  --bg-tertiary: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Glass Effects */
  --glass-bg: rgba(15, 23, 42, 0.75);
  --glass-border: rgba(148, 163, 184, 0.25);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  --gradient-bg: linear-gradient(135deg, #0f0f23 0%, #16213e 50%, #2d1b69 100%);
  --gradient-text: linear-gradient(120deg, var(--primary), var(--accent), var(--info));

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.4);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(15, 23, 42, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --gradient-bg: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #fce7f3 100%);
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--gradient-bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.7;
  transition: background var(--transition-slow), color var(--transition-normal);
}

/* ===== ANIMATED BACKGROUND ===== */
.bg-animation {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.floating-shapes {
  position: absolute;
  inset: 0;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent), var(--primary));
  opacity: 0.12;
  filter: blur(1px);
  animation: float 25s ease-in-out infinite;
}

.shape:nth-child(1) {
  width: 120px;
  height: 120px;
  top: 10%;
  left: 8%;
  animation-delay: 0s;
}

.shape:nth-child(2) {
  width: 200px;
  height: 200px;
  top: 60%;
  right: 5%;
  animation-delay: 5s;
}

.shape:nth-child(3) {
  width: 80px;
  height: 80px;
  top: 75%;
  left: 15%;
  animation-delay: 10s;
}

.shape:nth-child(4) {
  width: 150px;
  height: 150px;
  top: 5%;
  right: 20%;
  animation-delay: 15s;
}

.shape:nth-child(5) {
  width: 100px;
  height: 100px;
  top: 40%;
  left: 50%;
  animation-delay: 8s;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0) rotate(0deg) scale(1);
  }

  25% {
    transform: translateY(-20px) rotate(90deg) scale(1.05);
  }

  50% {
    transform: translateY(10px) rotate(180deg) scale(0.95);
  }

  75% {
    transform: translateY(-15px) rotate(270deg) scale(1.02);
  }
}

/* ===== PARTICLE CANVAS ===== */
#particleCanvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.4;
}

/* ===== PAGE LOADER ===== */
.loader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
}

.loader-spinner {
  width: 60px;
  height: 60px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

.loader-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

[data-theme="light"] .header {
  background: rgba(255, 255, 255, 0.85);
}

.header.scrolled {
  padding: 10px 0;
  box-shadow: var(--shadow-md);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: 'Playfair Display', 'Georgia', serif;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-left: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-primary);
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--primary);
  color: white;
  transform: rotate(15deg) scale(1.05);
  box-shadow: var(--shadow-glow);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-primary);
  cursor: pointer;
}

/* ===== MAIN CONTENT ===== */
main {
  padding-top: 100px;
  min-height: 100vh;
}

/* ===== PAGE TITLE ===== */
.page-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  text-align: center;
  margin-bottom: 50px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.page-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 3px;
}

/* ===== GLASS CARD ===== */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  transform: translateX(-100%);
  transition: transform 0.7s ease;
}

.glass-card:hover::before {
  transform: translateX(100%);
}

.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(102, 126, 234, 0.3);
}

/* ===== HERO SECTION (HOME) ===== */
.hero {
  min-height: calc(100vh - 100px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: center;
  max-width: 1100px;
}

.hero-image-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.profile-ring {
  padding: 5px;
  border-radius: 50%;
  background: conic-gradient(from 180deg, var(--primary), var(--accent), var(--info), var(--primary));
}

.profile-image {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-primary);
  box-shadow: var(--shadow-lg);
  animation: floatImage 6s ease-in-out infinite;
}

@keyframes floatImage {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-12px);
  }
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.hero-pill {
  padding: 8px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
}

.hero-text {
  text-align: left;
}

.hero-kicker {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  min-height: 1.5em;
  margin-bottom: 20px;
}

.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1.2em;
  background: var(--accent);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
}

@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

.hero-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 28px;
}

/* Stats */
.hero-stats {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.stat-item {
  text-align: center;
  padding: 16px 24px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  min-width: 100px;
  transition: all var(--transition-fast);
}

.stat-item:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.stat-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* CTA Buttons */
.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Current Research Banner */
.current-research {
  margin-top: 40px;
  padding: 24px;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(240, 147, 251, 0.1));
  border: 1px solid rgba(102, 126, 234, 0.3);
  border-left: 4px solid var(--primary);
  border-radius: 16px;
}

.current-research h3 {
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.current-research p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.current-research ul {
  list-style: none;
  padding: 0;
}

.current-research li {
  position: relative;
  padding-left: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.current-research li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: bold;
}

/* ===== SKILLS SECTION ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 24px;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.skill-card:hover::before {
  transform: scaleX(1);
}

.skill-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.skill-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 12px;
  font-size: 1.3rem;
}

.skill-card h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-pill {
  padding: 8px 14px;
  font-size: 0.85rem;
  background: rgba(102, 126, 234, 0.1);
  border: 1px solid var(--glass-border);
  border-radius: 30px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.skill-pill:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: scale(1.05);
}

.skill-pill i {
  font-size: 0.9rem;
}

/* ===== PROJECTS SECTION ===== */
.projects-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 30px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--gradient-primary);
  color: white;
  border-color: transparent;
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.35);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.project-card.featured {
  border: 2px solid var(--primary);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(240, 147, 251, 0.05));
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.project-badge {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--gradient-primary);
  color: white;
  border-radius: 20px;
  margin-bottom: 16px;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.project-meta {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.project-highlights {
  list-style: none;
  padding: 0;
  margin-bottom: 16px;
}

.project-highlights li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--glass-border);
}

.project-highlights li:last-child {
  border-bottom: none;
}

.project-highlights i {
  color: var(--success);
  margin-top: 3px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tech-badge {
  padding: 6px 12px;
  font-size: 0.8rem;
  background: rgba(102, 126, 234, 0.1);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tech-badge:hover {
  background: var(--primary);
  color: white;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.85rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ===== EXPERIENCE SECTION ===== */
.experience-category {
  margin-bottom: 50px;
}

.experience-category h2 {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary);
  display: inline-flex;
}

.experience-grid {
  display: grid;
  gap: 20px;
}

.experience-item {
  position: relative;
  padding-left: 36px;
}

.experience-item::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  opacity: 0.5;
}

.experience-dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--gradient-primary);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

.experience-dot.current {
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {

  0%,
  100% {
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
  }

  50% {
    box-shadow: 0 0 0 8px rgba(102, 126, 234, 0.1);
  }
}

.experience-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
}

.experience-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.experience-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.experience-org {
  font-size: 0.95rem;
  color: var(--accent);
  margin-top: 4px;
}

.experience-date {
  padding: 6px 14px;
  font-size: 0.8rem;
  background: rgba(102, 126, 234, 0.1);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  color: var(--info);
}

.experience-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.experience-highlights {
  list-style: none;
  padding: 0;
  margin-top: 16px;
}

.experience-highlights li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px dashed var(--glass-border);
}

.experience-highlights li:last-child {
  border-bottom: none;
}

.experience-highlights i {
  color: var(--success);
  margin-top: 4px;
}

/* ===== CERTIFICATIONS ===== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.cert-card {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
}

.cert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.cert-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 14px;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.cert-content h4 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.cert-issuer {
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.cert-topics {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===== EDUCATION TIMELINE ===== */
.education-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.education-timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--primary), var(--accent), var(--info));
  border-radius: 3px;
  opacity: 0.6;
}

.edu-item {
  position: relative;
  margin-left: 50px;
  margin-bottom: 32px;
}

.edu-dot {
  position: absolute;
  left: -42px;
  top: 8px;
  width: 18px;
  height: 18px;
  background: var(--gradient-primary);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 0 6px rgba(102, 126, 234, 0.3);
}

.edu-dot.current {
  animation: pulseDot 2s ease-in-out infinite;
}

.edu-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
}

.edu-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.edu-card.current {
  border-color: var(--success);
  border-left: 4px solid var(--success);
}

.current-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--success);
  color: white;
  border-radius: 20px;
  margin-bottom: 12px;
}

.edu-degree {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.edu-inst {
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.edu-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.edu-focus {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--glass-border);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ===== CONTACT SECTION ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  text-decoration: none;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.contact-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 14px;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.contact-details h4 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.contact-details p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.contact-details a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
}

/* Social Links */
.social-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 40px 0;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  text-decoration: none;
  backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.social-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.03), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.social-link:hover::before {
  transform: translateX(100%);
}

.social-link:hover {
  transform: translateY(-4px);
}

/* Platform-specific shadows */
.social-link[data-platform="email"]:hover {
  box-shadow: 0 12px 32px rgba(234, 67, 53, 0.35);
  border-color: #ea4335;
}

.social-link[data-platform="whatsapp"]:hover {
  box-shadow: 0 12px 32px rgba(37, 211, 102, 0.35);
  border-color: #25d366;
}

.social-link[data-platform="linkedin"]:hover {
  box-shadow: 0 12px 32px rgba(0, 119, 181, 0.4);
  border-color: #0077b5;
}

.social-link[data-platform="github"]:hover {
  box-shadow: 0 12px 32px rgba(110, 84, 148, 0.4);
  border-color: #6e5494;
}

.social-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 12px;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.social-details h4 {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.social-details p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Quick Actions */
.quick-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin: 40px 0;
}

/* Contact Form */
.contact-form-container {
  margin-top: 50px;
}

.contact-form-container h3 {
  text-align: center;
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 24px;
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-status {
  text-align: center;
  font-size: 0.9rem;
  margin-top: 16px;
  min-height: 1.5em;
}

.form-status.success {
  color: var(--success);
}

.form-status.error {
  color: #f87171;
}

/* ===== CV PAGE ===== */
.cv-intro {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

.cv-intro p {
  flex: 1;
  min-width: 200px;
  color: var(--text-secondary);
}

.cv-frame {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  overflow: hidden;
}

.cv-frame iframe {
  width: 100%;
  height: 900px;
  border: none;
}

/* ===== FOOTER ===== */
.footer {
  margin-top: 80px;
  padding: 40px 24px;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  background: rgba(15, 15, 35, 0.5);
}

[data-theme="light"] .footer {
  background: rgba(255, 255, 255, 0.5);
}

.footer-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.footer-links a {
  font-size: 1.3rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
  transform: scale(1.2);
}

/* ===== SCROLL TO TOP ===== */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 14px;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 50;
  box-shadow: var(--shadow-md);
}

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

.scroll-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* ===== SCROLL ANIMATIONS ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-text {
    text-align: center;
  }

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

  .cta-buttons {
    justify-content: center;
  }

  .current-research {
    text-align: left;
  }

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

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

@media (max-width: 768px) {

  /* Navigation */
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(15, 15, 35, 0.98);
    backdrop-filter: blur(20px);
    padding: 20px;
    transform: translateY(-120%);
    transition: transform var(--transition-normal);
    border-bottom: 1px solid var(--glass-border);
    z-index: 999;
  }

  [data-theme="light"] .nav-links {
    background: rgba(255, 255, 255, 0.98);
  }

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

  .nav-link {
    padding: 12px 16px;
    font-size: 1rem;
  }

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

  .theme-toggle {
    position: absolute;
    right: 70px;
    top: 50%;
    transform: translateY(-50%);
    width: 38px;
    height: 38px;
  }

  /* General */
  .section {
    padding: 60px 20px;
  }

  .page-title {
    font-size: 2rem;
  }

  /* Hero */
  .profile-image {
    width: 200px;
    height: 200px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .stat-item {
    min-width: 80px;
    padding: 12px 16px;
  }

  .stat-number {
    font-size: 1.4rem;
  }

  /* Forms */
  .form-row {
    grid-template-columns: 1fr;
  }

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

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

  .contact-form-container {
    padding: 20px;
  }

  .contact-form-container h3 {
    font-size: 1.3rem;
  }

  /* Projects */
  .projects-filters {
    gap: 8px;
  }

  .filter-btn {
    padding: 8px 16px;
    font-size: 0.85rem;
  }

  /* Cards */
  .glass-card {
    padding: 20px;
  }

  .project-card {
    padding: 20px;
  }

  /* Experience */
  .experience-header {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Certifications */
  .cert-grid {
    grid-template-columns: 1fr;
  }

  /* Education Timeline */
  .edu-item {
    margin-left: 40px;
  }

  .edu-dot {
    left: -36px;
  }
}

@media (max-width: 480px) {

  /* Typography */
  .page-title {
    font-size: 1.6rem;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-kicker {
    font-size: 0.85rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  /* Stats */
  .hero-stats {
    gap: 10px;
  }

  .stat-item {
    min-width: 70px;
    padding: 10px 12px;
  }

  .stat-number {
    font-size: 1.2rem;
  }

  .stat-label {
    font-size: 0.7rem;
  }

  /* Buttons */
  .btn {
    padding: 12px 20px;
    font-size: 0.9rem;
  }

  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }

  .cta-buttons .btn {
    width: 100%;
  }

  /* Profile */
  .profile-image {
    width: 180px;
    height: 180px;
  }

  .hero-pill {
    font-size: 0.75rem;
    padding: 6px 12px;
  }

  /* Scroll to top */
  .scroll-top {
    width: 44px;
    height: 44px;
    bottom: 80px;
    /* Move up to avoid overlapping form */
    right: 20px;
  }

  /* Current Research */
  .current-research {
    padding: 18px;
    margin-top: 30px;
  }

  .current-research h3 {
    font-size: 1rem;
  }

  .current-research p {
    font-size: 0.85rem;
  }

  .current-research li {
    font-size: 0.8rem;
  }

  /* Cards */
  .glass-card {
    padding: 16px;
  }

  .project-card,
  .experience-card,
  .edu-card {
    padding: 16px;
  }

  .skill-card {
    padding: 18px;
  }

  /* Contact */
  .contact-card {
    padding: 16px;
  }

  .contact-icon {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }

  .contact-details h4 {
    font-size: 0.95rem;
  }

  .contact-details p {
    font-size: 0.85rem;
  }

  .social-link {
    padding: 14px;
  }

  .social-icon {
    font-size: 1.5rem;
  }

  .social-details h4 {
    font-size: 0.95rem;
  }

  .social-details p {
    font-size: 0.8rem;
  }

  .contact-form-container h3 {
    font-size: 1.1rem;
  }

  .form-group label {
    font-size: 0.9rem;
  }

  .form-group input,
  .form-group textarea {
    font-size: 0.9rem;
  }

  /* Quick actions */
  .quick-actions {
    flex-direction: column;
    gap: 10px;
  }

  .quick-actions .btn {
    width: 100%;
  }

  /* Projects */
  .project-title {
    font-size: 1rem;
  }

  .project-desc {
    font-size: 0.85rem;
  }

  .project-meta {
    font-size: 0.8rem;
  }

  .tech-badge {
    font-size: 0.75rem;
    padding: 5px 10px;
  }

  /* Experience */
  .experience-title {
    font-size: 1rem;
  }

  .experience-org {
    font-size: 0.85rem;
  }

  .experience-desc,
  .experience-highlights li {
    font-size: 0.85rem;
  }

  /* Certifications */
  .cert-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .cert-icon {
    width: 50px;
    height: 50px;
    font-size: 1.3rem;
  }

  .cert-content h4 {
    font-size: 0.95rem;
  }

  .cert-issuer {
    font-size: 0.8rem;
  }

  .cert-topics {
    font-size: 0.75rem;
  }

  /* Education */
  .edu-item {
    margin-left: 30px;
  }

  .edu-dot {
    left: -28px;
    width: 14px;
    height: 14px;
  }

  .education-timeline::before {
    left: 13px;
  }

  .edu-degree {
    font-size: 1rem;
  }

  .edu-inst {
    font-size: 0.85rem;
  }

  .edu-meta {
    font-size: 0.8rem;
  }

  .edu-focus {
    font-size: 0.8rem;
  }

  /* Footer */
  .footer-content {
    flex-direction: column;
    gap: 16px;
  }

  .footer-links {
    gap: 16px;
  }
}