/* 
  ==========================================
  Variables & Theme Definition
  ==========================================
*/
:root {
  /* Colors */
  --bg-color: #0d1117;           /* Dark Github-like background */
  --bg-color-alt: #161b22;       /* Slightly lighter for cards */
  --bg-color-card: #21262d;      /* For distinct cards */
  --text-primary: #c9d1d9;       /* Light text */
  --text-secondary: #8b949e;     /* Dimmed text */
  --accent-color: #38bdf8;       /* Cyan/Blue primary accent */
  --accent-hover: #0ea5e9;       /* Darker cyan/blue on hover */
  --border-color: #30363d;       /* Subtle border */
  
  /* Typography */
  --font-main: 'Inter', sans-serif;
  
  /* Spacing & Transitions */
  --transition: all 0.3s ease;
  --nav-height: 80px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height); /* For sticky navbar offset */
}

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

ul {
  list-style: none;
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: #ffffff;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 50%;
  height: 4px;
  background-color: var(--accent-color);
  border-radius: 2px;
}

section {
  padding: 100px 0;
}

/* 
  ==========================================
  Buttons
  ==========================================
*/
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #000 !important;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-color) !important;
  border-color: var(--accent-color);
}

.btn-secondary:hover {
  background-color: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}

/* 
  ==========================================
  Navbar Navigation
  ==========================================
*/
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background-color: rgba(13, 17, 23, 0.85); /* Semi-transparent */
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
}

.logo span {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-color);
}

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--accent-color);
  transition: width 0.3s ease;
}

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

/* Hamburger for mobile */
.hamburger {
  display: none;
  cursor: pointer;
}

.hamburger .bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  transition: var(--transition);
  background-color: #ffffff;
  border-radius: 3px;
}

/* 
  ==========================================
  Hero Section
  ==========================================
*/
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--nav-height);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
}

.hero-content {
  flex: 1.2;
}

.hero-image {
  flex: 0.8;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image img {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: top;
  border-radius: 50%;
  border: 4px solid var(--border-color);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.15);
  transition: var(--transition);
}

.hero-image img:hover {
  border-color: var(--accent-color);
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(56, 189, 248, 0.3);
}

.greeting {
  color: var(--accent-color);
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.name {
  font-size: 4rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.5rem;
  line-height: 1.1;
}

.role {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.tagline {
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.hero .social-links {
  display: flex;
  gap: 1.5rem;
}

.hero .social-links a {
  font-size: 1.5rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.hero .social-links a:hover {
  color: var(--accent-color);
  transform: translateY(-3px);
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator a {
  color: var(--text-secondary);
  font-size: 1.5rem;
}

.scroll-indicator a:hover {
  color: var(--accent-color);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-15px);
  }
  60% {
    transform: translateY(-7px);
  }
}

/* 
  ==========================================
  About Section
  ==========================================
*/
.about {
  background-color: var(--bg-color-alt);
}

.about-content {
  background-color: var(--bg-color-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 3rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.about-text p {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

.about-text strong {
  color: var(--accent-color);
}

.personal-info {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.info-item i {
  color: var(--accent-color);
  font-size: 1.2rem;
}

.info-item span {
  font-weight: 500;
  color: #fff;
}

/* 
  ==========================================
  Skills Section
  ==========================================
*/
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.skill-category {
  background-color: var(--bg-color-alt);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--accent-color);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.skill-category h3 {
  color: #fff;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.skill-category h3 i {
  color: var(--accent-color);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.tag {
  background-color: rgba(56, 189, 248, 0.1);
  color: var(--accent-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid rgba(56, 189, 248, 0.2);
  transition: var(--transition);
}

.tag:hover {
  background-color: var(--accent-color);
  color: #000;
}

/* 
  ==========================================
  Projects Section
  ==========================================
*/
.projects {
  background-color: var(--bg-color-alt);
}

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

.project-card {
  background-color: var(--bg-color-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-color);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.project-card h3 {
  color: #fff;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1; /* Pushes tags to bottom */
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: auto;
}

.ptag {
  font-size: 0.8rem;
  color: var(--text-primary);
  opacity: 0.8;
  font-family: monospace;
}

.ptag::before {
  content: '#';
  color: var(--accent-color);
}

/* 
  ==========================================
  Certifications & Education
  ==========================================
*/
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.timeline {
  position: relative;
  padding-left: 30px;
  margin-top: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 5px;
  height: 100%;
  width: 2px;
  background-color: var(--border-color);
}

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

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

.timeline-dot {
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent-color);
  box-shadow: 0 0 0 4px var(--bg-color);
}

.card-style {
  background-color: var(--bg-color-alt);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: var(--transition);
}

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

.timeline-date {
  font-size: 0.85rem;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.timeline-content h4 {
  color: #fff;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.timeline-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.cgpa {
  margin-top: 0.5rem;
  display: inline-block;
  background: rgba(255, 255, 255, 0.05);
  padding: 4px 10px;
  border-radius: 4px;
  font-weight: 500;
  color: #fff !important;
}

/* 
  ==========================================
  Contact Section
  ==========================================
*/
.contact {
  background-color: var(--bg-color-alt);
}

.contact-subtitle {
  margin-bottom: 3rem;
  font-size: 1.1rem;
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
}

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

.contact-card {
  background-color: var(--bg-color-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: var(--transition);
}

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

.contact-card i {
  font-size: 1.8rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.contact-card h4 {
  color: #fff;
  margin-bottom: 0.5rem;
}

.contact-card a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.contact-form {
  background-color: var(--bg-color-card);
  padding: 2.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1.5rem;
}

input, textarea {
  width: 100%;
  padding: 1rem;
  background-color: var(--bg-color-alt);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: #fff;
  font-family: var(--font-main);
  transition: var(--transition);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.submit-btn {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

/* 
  ==========================================
  Footer
  ==========================================
*/
footer {
  background-color: var(--bg-color);
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

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

.footer-container .logo {
  font-size: 1.2rem;
}

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

.footer-container .social-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.5rem;
}

.footer-container .social-links a {
  color: var(--text-secondary);
  font-size: 1.2rem;
}

.footer-container .social-links a:hover {
  color: var(--accent-color);
}

/* 
  ==========================================
  Toast Notifications
  ==========================================
*/
#notification-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.notification {
  background-color: var(--bg-color-card);
  color: #fff;
  padding: 16px 24px;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  transform: translateX(120%);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  border-left: 4px solid transparent;
}

.notification.show {
  transform: translateX(0);
  opacity: 1;
}

.notification.success {
  border-left-color: #10b981; /* Emerald green */
}

.notification.success i {
  color: #10b981;
  font-size: 1.2rem;
}

.notification.error {
  border-left-color: #ef4444; /* Red */
}

.notification.error i {
  color: #ef4444;
  font-size: 1.2rem;
}

/* 
  ==========================================
  Media Queries (Responsive Design)
  ==========================================
*/
@media (max-width: 900px) {
  .edu-grid, .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .hero-container {
    flex-direction: column-reverse;
    text-align: center;
    gap: 3rem;
    margin-top: 2rem;
  }

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

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

  .hero-image img {
    max-width: 280px;
  }

  .name {
    font-size: 3rem;
  }
  
  .role {
    font-size: 1.8rem;
  }


  .about-content {
    padding: 2rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  /* Navbar Mobile Menu */
  .hamburger {
    display: block;
    z-index: 1001;
  }
  
  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .nav-links {
    position: fixed;
    left: 100%;
    top: 0;
    gap: 0;
    flex-direction: column;
    background-color: var(--bg-color-card);
    width: 100%;
    height: 100vh;
    text-align: center;
    transition: 0.3s;
    justify-content: center;
    align-items: center;
    padding: 0;
  }

  .nav-links.active {
    left: 0;
  }

  .nav-links li {
    margin: 1.5rem 0;
  }
  
  .nav-links a {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    text-align: center;
    width: 100%;
  }
  
  .contact-info-cards {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .contact-card {
    flex: 1 1 100%;
  }
}