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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', sans-serif;
  background: #121212;
  color: #e0e0e0;
  line-height: 1.6;
}

/* Container */
.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}

/* Navigation */
nav {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  transition: background 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo a {
  font-size: 1.8rem;
  font-weight: 600;
  color: #e0e0e0;
  text-decoration: none;
}

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

.nav-links li {
  margin-left: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: #e0e0e0;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: #ff9800;
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: none;
  font-size: 1.8rem;
  color: #e0e0e0;
  cursor: pointer;
}

/* Hero Section */
.hero {
  position: relative;
  background: url('https://via.placeholder.com/1600x900/000000/555555?text=Portfolio+Hero') center center/cover no-repeat;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px; /* offset for fixed nav */
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.65);
}

.hero-container {
  position: relative;
  text-align: center;
  color: #fff;
  z-index: 2;
}

.hero-title {
  font-size: 3.8rem;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.6rem;
  margin-bottom: 2rem;
}

.btn {
  background: linear-gradient(45deg, #ff9800, #f57c00);
  color: #fff;
  padding: 0.8rem 2rem;
  border: none;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 500;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
  transform: scale(1.05);
  box-shadow: 0 5px 15px rgba(255, 152, 0, 0.5);
}

/* Extra style for GitHub button spacing */
.github-btn {
  margin-top: 1rem;
  display: inline-block;
}

/* Section Headings */
section h2 {
  font-size: 2.8rem;
  margin-bottom: 1.5rem;
  color: #ff9800;
  text-align: center;
  position: relative;
}

section h2::after {
  content: '';
  width: 100px;
  height: 3px;
  background: #ff9800;
  display: block;
  margin: 0.5rem auto;
  border-radius: 3px;
}

/* About Section */
.about {
  padding: 6rem 0;
  background: #1e1e1e;
}

.about-container {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
  justify-content: space-between;
}

.about-content, .about-details {
  flex: 1;
  min-width: 280px;
}

.about-details ul {
  list-style: none;
  font-size: 1rem;
  line-height: 1.8;
}

.about-details li {
  margin-bottom: 0.8rem;
}

/* Experience, Education, Certifications Sections */
.experience, .education, .certifications {
  padding: 6rem 0;
  background: #181818;
}

.experience-item, .education-item, .certification-item {
  background: #242424;
  padding: 2rem;
  margin-bottom: 2rem;
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.6);
  transition: transform 0.3s ease;
}

.experience-item:hover, .education-item:hover, .certification-item:hover {
  transform: translateY(-5px);
}

.experience-item h3,
.education-item h3,
.certification-item h3 {
  color: #ff9800;
  margin-bottom: 0.5rem;
}

.date {
  font-style: italic;
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
  display: block;
  color: #bdbdbd;
}

/* Projects Section */
.projects {
  padding: 6rem 0;
  background: #121212;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.project-item {
  background: #1f1f1f;
  padding: 2rem;
  border-left: 5px solid #ff9800;
  border-radius: 8px;
  transition: transform 0.3s ease;
}

.project-item:hover {
  transform: translateY(-5px);
}

.project-item h3 {
  color: #ff9800;
  margin-bottom: 1rem;
}

/* Skills Section */
.skills {
  padding: 6rem 0;
  background: #181818;
  text-align: center;
}

.skills-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.skills-list li {
  background: #ff9800;
  color: #121212;
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  font-size: 0.9rem;
}

/* Contact Section */
.contact {
  padding: 6rem 0;
  background: #121212;
  text-align: center;
}

.contact-form {
  max-width: 600px;
  margin: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-form input,
.contact-form textarea {
  padding: 1.2rem;
  border: 1px solid #444;
  border-radius: 8px;
  font-size: 1rem;
  background: #1e1e1e;
  color: #e0e0e0;
  outline: none;
  transition: border-color 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: #ff9800;
}

.contact-form button {
  padding: 1rem;
  border: none;
  border-radius: 50px;
  background: linear-gradient(45deg, #ff9800, #f57c00);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.contact-form button:hover {
  transform: scale(1.05);
}

/* Footer */
.footer {
  background: #000;
  color: #aaa;
  padding: 2.5rem 0;
  text-align: center;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.social-links a {
  color: #aaa;
  font-size: 1.8rem;
  margin: 0 0.5rem;
  transition: color 0.3s ease;
}

.social-links a:hover {
  color: #ff9800;
}

/* Animations */
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-50px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(50px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideRight {
  from { opacity: 0; transform: translateX(-50px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes slideLeft {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes zoomIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-15px); }
  60% { transform: translateY(-7px); }
}

/* Animation Classes */
.animate-slide-down {
  animation: slideDown 1s ease-out forwards;
}
.animate-slide-up {
  animation: slideUp 1s ease-out forwards;
}
.animate-slide-right {
  animation: slideRight 1s ease-out forwards;
}
.animate-slide-left {
  animation: slideLeft 1s ease-out forwards;
}
.animate-fade-in {
  animation: fadeIn 1s ease-out forwards;
}
.animate-zoom-in {
  animation: zoomIn 1s ease-out forwards;
}
.animate-bounce {
  animation: bounce 2s infinite;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    background: #1e1e1e;
    position: absolute;
    top: 60px;
    right: 0;
    width: 220px;
    border: 1px solid #444;
    box-shadow: 0 4px 8px rgba(0,0,0,0.6);
    padding: 1rem;
  }
  .nav-links.active {
    display: flex;
  }
  .nav-links li {
    margin: 1rem 0;
  }
  .about-container {
    flex-direction: column;
    text-align: center;
  }
}