/* Modern Portfolio CSS with Glassmorphism and Advanced Styling */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* CSS Custom Properties for Theming */
:root {
  /* Color Palette */
  --primary-navy: #0A1628;
  --electric-blue: #00D4FF;
  --neon-green: #00FF88;
  --warm-white: #FAFAFA;
  --charcoal: #2D3748;
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.2);
  --shadow-heavy: rgba(0, 0, 0, 0.3);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #0A1628 0%, #00D4FF 100%);
  --gradient-secondary: linear-gradient(135deg, #00D4FF 0%, #00FF88 100%);
  --gradient-accent: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
  
  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --section-padding: 120px 0;
  --container-padding: 0 2rem;
  --border-radius: 20px;
  --border-radius-small: 12px;
  
  /* Animations */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Dark Mode Variables */
body.dark-mode {
  --warm-white: #1A202C;
  --charcoal: #E2E8F0;
  --glass-bg: rgba(0, 0, 0, 0.2);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-light: rgba(255, 255, 255, 0.05);
  --shadow-medium: rgba(255, 255, 255, 0.1);
  --shadow-heavy: rgba(255, 255, 255, 0.15);
}

body.dark-mode .skill-card,
body.dark-mode .profile-card,
body.dark-mode .project-card,
body.dark-mode .certificate-card {
  background: #2D3748;
  color: #E2E8F0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background: var(--warm-white);
  color: var(--charcoal);
  line-height: 1.7;
  overflow-x: hidden;
  transition: var(--transition-smooth);
}

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0.03;
  z-index: -2;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { transform: translateX(0) translateY(0) rotate(0deg); }
  25% { transform: translateX(-5px) translateY(-5px) rotate(1deg); }
  50% { transform: translateX(5px) translateY(5px) rotate(-1deg); }
  75% { transform: translateX(-3px) translateY(3px) rotate(0.5deg); }
}

/* Floating Particles */
.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--electric-blue);
  border-radius: 50%;
  opacity: 0.6;
  animation: float 20s infinite linear;
}

@keyframes float {
  0% {
    transform: translateY(100vh) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-100px) translateX(100px);
    opacity: 0;
  }
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--container-padding);
}

/* Glassmorphism Utility Classes */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-small);
  box-shadow: 0 8px 32px var(--shadow-light);
  transition: var(--transition-smooth);
}

.glass-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-medium);
  border-color: var(--electric-blue);
}

/* Header Section */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition-smooth);
}

.header.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 20px var(--shadow-light);
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-navy);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.logo .highlight {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
}

.nav-link {
  color: var(--charcoal);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: var(--transition-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-secondary);
  transition: var(--transition-smooth);
}

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

.nav-link:hover {
  color: var(--electric-blue);
}

.theme-toggle {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-bounce);
  color: var(--charcoal);
}

.theme-toggle:hover {
  transform: scale(1.1) rotate(180deg);
  background: var(--electric-blue);
  color: white;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--charcoal);
  transition: var(--transition-smooth);
  border-radius: 2px;
}

/* Hero/About Section */
.about {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: var(--gradient-primary);
  color: white;
  overflow: hidden;
}

.about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(10px, 10px); }
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.about-text h2 {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.about-text h2 .highlight {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-text p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  line-height: 1.8;
}

.about-photo {
  display: flex;
  justify-content: center;
  position: relative;
}

.about-photo::before {
  content: '';
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
  background: var(--gradient-secondary);
  border-radius: 50%;
  opacity: 0.2;
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.2; }
  50% { transform: scale(1.05); opacity: 0.3; }
}

.about-photo img {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(255, 255, 255, 0.3);
  position: relative;
  z-index: 2;
  transition: var(--transition-smooth);
}

.about-photo img:hover {
  transform: scale(1.05);
  border-color: var(--neon-green);
}

/* Modern Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border: none;
  border-radius: var(--border-radius-small);
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-bounce);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition-smooth);
}

.btn:hover::before {
  left: 100%;
}

.primary-btn {
  background: var(--gradient-secondary);
  color: white;
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.primary-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
}

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

.secondary-btn:hover {
  transform: translateY(-3px);
  background: var(--electric-blue);
  color: white;
}

/* Skills Section */
.skills {
  padding: var(--section-padding);
  position: relative;
  background: var(--warm-white);
}

.skills h2 {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 3rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.skill-card {
  padding: 2rem;
  text-align: center;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  background: white;
  border-radius: var(--border-radius-small);
  box-shadow: 0 8px 32px var(--shadow-light);
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-accent);
  opacity: 0;
  transition: var(--transition-smooth);
  z-index: -1;
}

.skill-card:hover::before {
  opacity: 0.1;
}

.skill-card img {
  width: 80px;
  height: 80px;
  margin-bottom: 1.5rem;
  transition: var(--transition-bounce);
  filter: drop-shadow(0 4px 8px var(--shadow-light));
}

.skill-card:hover img {
  transform: scale(1.1) rotate(5deg);
}

.skill-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--primary-navy);
}

.skill-card p {
  font-size: 1rem;
  line-height: 1.6;
  opacity: 0.8;
}

/* Profiles Section */
.profiles {
  padding: var(--section-padding);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  position: relative;
}

.profiles h2 {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 3rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Profiles Grid */
.profiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.profile-card {
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition-bounce);
  position: relative;
  background: white;
  border-radius: var(--border-radius-small);
  box-shadow: 0 4px 16px var(--shadow-light);
}

.profile-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-secondary);
  opacity: 0;
  transition: var(--transition-smooth);
  z-index: -1;
  border-radius: var(--border-radius-small);
}

.profile-card:hover::after {
  opacity: 0.1;
}

.profile-card:hover {
  transform: translateY(-10px) scale(1.02);
}

.profile-card img {
  width: 60px;
  height: 60px;
  margin-bottom: 1rem;
  border-radius: var(--border-radius-small);
  transition: var(--transition-smooth);
}

.profile-card:hover img {
  transform: scale(1.1);
  filter: brightness(1.1);
}

.profile-card a {
  text-decoration: none;
  color: inherit;
}

.profile-card p {
  font-weight: 600;
  font-size: 1rem;
}

/* Projects Section */
.projects {
  padding: var(--section-padding);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  position: relative;
}

.projects h2 {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 3rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.project-card {
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition-smooth);
  position: relative;
  background: white;
  box-shadow: 0 10px 30px var(--shadow-light);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-smooth);
  z-index: 1;
}

.project-card:hover::before {
  opacity: 0.05;
}

.project-card:hover {
  transform: translateY(-15px);
  box-shadow: 0 25px 50px var(--shadow-medium);
}

.project-card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 1.5rem;
  color: var(--primary-navy);
}

.project-card p {
  font-size: 1rem;
  line-height: 1.6;
  margin: 0 1.5rem 1.5rem;
  opacity: 0.8;
}

/* Certificates Section */
.certificates {
  padding: var(--section-padding);
  background: var(--warm-white);
}

.certificates h2 {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 3rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.certificate-card {
  padding: 2rem;
  text-align: center;
  border-radius: var(--border-radius);
  transition: var(--transition-smooth);
  position: relative;
  background: white;
  box-shadow: 0 5px 20px var(--shadow-light);
}

.certificate-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-accent);
  opacity: 0;
  transition: var(--transition-smooth);
  z-index: -1;
  border-radius: var(--border-radius);
}

.certificate-card:hover::after {
  opacity: 0.05;
}

.certificate-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px var(--shadow-medium);
}

.certificate-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--border-radius-small);
  margin-bottom: 1.5rem;
  transition: var(--transition-smooth);
}

.certificate-card:hover img {
  transform: scale(1.02);
}

.certificate-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--primary-navy);
}

.certificate-card p {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  opacity: 0.8;
}
.highlight-cert {
    border: 2px solid #00d4ff;
    transform: scale(1.03);
}
/* =========================
   RESEARCH SECTION (FINAL)
========================= */

.research {
  padding: var(--section-padding);
  background: var(--warm-white);
}

.research h2 {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 10px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Subtitle */
.research-subtitle {
  text-align: center;
  color: #888;
  margin-bottom: 40px;
  font-size: 1rem;
  letter-spacing: 0.5px;
}

/* Card */
.research-card {
  padding: 35px;
  border-radius: var(--border-radius);
  transition: var(--transition-smooth);
  position: relative;
}

/* Hover glow */
.research-card:hover {
  transform: translateY(-10px);
  border: 1px solid var(--electric-blue);
  box-shadow: 0 25px 70px rgba(0, 212, 255, 0.2);
}

/* Layout */
.research-flex {
  display: flex;
  gap: 50px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

/* LEFT CONTENT */
.research-left {
  flex: 1;
}

.research-left h3 {
  font-size: 2.2rem;
  font-weight: 700;
  margin: 10px 0;
  color: var(--primary-navy);
  line-height: 1.3;
}

.research-left p {
  font-size: 1rem;
  line-height: 1.7;
  opacity: 0.9;
  margin-bottom: 15px;
}

/* Badge */
.research-badge {
  display: inline-block;
  background: linear-gradient(90deg, #00d4ff, #00ff88);
  color: black;
  padding: 6px 14px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}

/* TAGS */
.research-tags {
  margin: 15px 0;
}

.research-tags span {
  display: inline-block;
  background: rgba(0, 212, 255, 0.1);
  color: var(--electric-blue);
  padding: 6px 14px;
  margin: 5px 6px 5px 0;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  transition: 0.3s;
}

.research-tags span:hover {
  background: var(--electric-blue);
  color: #fff;
  transform: scale(1.05);
}

/* LIST */
.research-left ul {
  margin-top: 10px;
  padding-left: 20px;
}

.research-left li {
  margin-bottom: 8px;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* BUTTON */
.research-left .btn {
  margin-top: 20px;
}

/* RIGHT IMAGE */
.research-right {
  flex: 1;
  text-align: center;
  position: relative;
}

/* Glow behind image */
.research-right::before {
  content: "";
  position: absolute;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.2), transparent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
}

/* Image */
.research-right img {
  width: 100%;
  max-width: 450px;
  border-radius: 15px;
  transition: 0.4s ease;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.research-right img:hover {
  transform: scale(1.05);
}

/* ================= RESPONSIVE ================= */

@media (max-width: 1024px) {
  .research-flex {
    gap: 30px;
  }

  .research-left h3 {
    font-size: 1.8rem;
  }
}

@media (max-width: 768px) {
  .research-flex {
    flex-direction: column;
    text-align: center;
  }

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

  .research-right img {
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .research-left h3 {
    font-size: 1.5rem;
  }
}
/* Contact Section */
.contact-section {
  padding: var(--section-padding);
  background: var(--gradient-primary);
  color: white;
  position: relative;
}

.contact-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
  opacity: 0.3;
}

.section-title {
  font-size: 3rem;
  font-weight: 900;
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  margin-bottom: 3rem;
  opacity: 0.9;
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  padding: 3rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--glass-border);
  position: relative;
  z-index: 2;
}

.contact-info h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.contact-info p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.contact-details {
  margin: 2rem 0;
}

.detail {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius-small);
  transition: var(--transition-smooth);
}

.detail:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(10px);
}

.detail i {
  font-size: 1.5rem;
  color: var(--neon-green);
  width: 24px;
}

.detail div h4 {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.detail div p {
  opacity: 0.8;
  margin: 0;
}

.social-icons {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.social-icons a {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  color: white;
  font-size: 1.2rem;
  transition: var(--transition-bounce);
}

.social-icons a:hover {
  transform: translateY(-5px) scale(1.1);
  background: var(--neon-green);
  color: var(--primary-navy);
}

/* Contact Form */
.contact-form h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.contact-form form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.input-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-small);
  color: white;
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: var(--transition-smooth);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--neon-green);
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}

/* Footer */
.footer {
  background: var(--primary-navy);
  color: white;
  padding: 2rem 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
  margin-bottom: 1rem;
  opacity: 0.8;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  color: var(--neon-green);
}

/* Scroll Progress Indicator */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 9999;
}

.scroll-progress-bar {
  height: 100%;
  background: var(--gradient-secondary);
  width: 0%;
  transition: width 0.1s ease;
}

/* Responsive Design */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px 0;
  }
  
  .about-content,
  .contact-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .about-text h2 {
    font-size: 2.5rem;
  }
  
  .skills-grid,
  .projects-grid,
  .certificates-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    border: 1px solid var(--glass-border);
    border-top: none;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .about-text h2 {
    font-size: 2rem;
  }
  
  .about-photo img {
    width: 200px;
    height: 200px;
  }
  
  .input-group {
    grid-template-columns: 1fr;
  }
  
  .social-icons {
    justify-content: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding: 60px 0;
    --container-padding: 0 1rem;
  }
  
  .about-text h2 {
    font-size: 1.8rem;
  }
  
  .skills h2,
  .projects h2,
  .certificates h2 {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .contact-container {
    padding: 2rem;
  }
}

/* Animation Classes for JavaScript */
.fade-in {
  opacity: 1;
  transform: translateY(0);
  transition: all 0.6s ease;
}

.fade-in.hidden {
  opacity: 0;
  transform: translateY(30px);
}

.slide-in-left {
  opacity: 1;
  transform: translateX(0);
  transition: all 0.6s ease;
}

.slide-in-left.hidden {
  opacity: 0;
  transform: translateX(-50px);
}

.slide-in-right {
  opacity: 1;
  transform: translateX(0);
  transition: all 0.6s ease;
}

.slide-in-right.hidden {
  opacity: 0;
  transform: translateX(50px);
}

.scale-in {
  opacity: 1;
  transform: scale(1);
  transition: all 0.6s ease;
}

.scale-in.hidden {
  opacity: 0;
  transform: scale(0.8);
}