@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700;800&display=swap');

:root {
  /* Color Palette */
  --bg-primary: #0a0a0a;
  --bg-secondary: #121212;
  --bg-tertiary: #1a1a1a;
  
  --accent-primary: #3b82f6; /* Blue */
  --accent-secondary: #8b5cf6; /* Purple */
  --accent-glow: rgba(59, 130, 246, 0.5);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(20, 20, 20, 0.6);
  --glass-border: rgba(255, 255, 255, 0.05);
  
  /* Typography */
  --font-main: 'Inter', sans-serif;
  --font-heading: 'Poppins', sans-serif;
  
  /* Spacing & Layout */
  --section-padding: 6rem 0;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 16px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

::selection {
  background: var(--accent-primary);
  color: #fff;
}

/* Utilities */
.text-gradient {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 4rem;
  font-size: 1.1rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: var(--transition-normal);
}

a:hover {
  text-decoration: none;
  color: var(--accent-secondary);
}

/* Buttons */
.btn-custom {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-main);
  font-weight: 500;
  border-radius: 8px;
  transition: var(--transition-normal);
  cursor: pointer;
  border: none;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-primary-custom {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary-custom:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--accent-glow);
  color: white;
}

.btn-primary-custom::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
  z-index: -1;
  transition: opacity var(--transition-normal);
  opacity: 0;
}

.btn-primary-custom:hover::before {
  opacity: 1;
}

.btn-outline-custom {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-outline-custom:hover {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.05);
  color: white;
}

/* Social Icons */
.social-icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 1.25rem;
  transition: var(--transition-normal);
  border: 1px solid var(--border-color);
}

.social-icon-link:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 5px 15px var(--accent-glow);
}

/* Layout overrides */
section {
  padding: var(--section-padding);
}

/* Navbar */
.navbar {
  padding: 1.5rem 0;
  transition: var(--transition-normal);
  background: transparent;
  z-index: 1000;
  position: fixed;
  width: 100%;
  top: 0;
}

.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--text-primary) !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand i {
  color: var(--accent-primary);
}

.navbar-nav .nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  margin: 0 0.5rem;
  position: relative;
  transition: var(--transition-normal);
}

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

.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: var(--transition-normal);
}

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

.navbar-toggler {
  border: none;
  color: var(--text-primary);
}
.navbar-toggler:focus {
  outline: none;
  box-shadow: none;
}
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px; /* navbar height */
}

/* Background effects */
.hero-bg-shapes {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.shape-1 {
  position: absolute;
  top: -10%; left: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, rgba(0,0,0,0) 70%);
  border-radius: 50%;
  filter: blur(60px);
}
.shape-2 {
  position: absolute;
  bottom: -10%; right: -5%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(139,92,246,0.15) 0%, rgba(0,0,0,0) 70%);
  border-radius: 50%;
  filter: blur(60px);
}

.hero .container {
  z-index: 1;
  position: relative;
}

.hero-subtitle {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 50px;
  color: var(--accent-primary);
  font-weight: 500;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.project-card {
  border-radius: var(--border-radius);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  transition: var(--transition-slow);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-10px);
  border-color: var(--accent-primary);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.project-img-wrapper {
  position: relative;
  overflow: hidden;
  padding-top: 60%; /* Aspect ratio */
}

.project-img-wrapper img {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.project-img-overlay {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(to top, rgba(10,10,10,0.9), transparent);
  opacity: 0;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.project-links a {
  width: 50px; height: 50px;
  background: var(--glass-bg);
  backdrop-filter: blur(4px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  border: 1px solid var(--glass-border);
  transform: translateY(20px);
  transition: var(--transition-normal);
  opacity: 0;
}

.project-card:hover .project-links a {
  transform: translateY(0);
  opacity: 1;
}
.project-links a:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.project-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Experience / Education Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}

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

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}
.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  transition: var(--transition-normal);
}

.timeline-content:hover {
  border-color: var(--glass-border);
  background: var(--bg-tertiary);
  transform: translateX(5px);
}

.timeline-date {
  color: var(--accent-primary);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.timeline-desc {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* Skills Section */
.skill-item {
  margin-bottom: 1.5rem;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.skill-bar-bg {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 4px;
  position: relative;
  width: 0; /* Animated via JS or style */
  transition: width 1s ease-in-out;
}

/* Contact Section */
.contact-info-card {
  padding: 2rem;
  height: 100%;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-icon {
  width: 50px; height: 50px;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.contact-text h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}
.contact-text p, .contact-text a {
  color: var(--text-secondary);
  margin: 0;
}

.form-control {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  transition: var(--transition-normal);
}

.form-control:focus {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
  color: var(--text-primary);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-muted);
}

.submit-btn {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.map-container {
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  height: 100%;
  min-height: 300px;
}
.map-container iframe {
  width: 100%;
  height: 100%;
  filter: grayscale(100%) invert(92%) contrast(83%);
}

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

.footer-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

.footer-socials {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 45px;
  height: 45px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
  transform: translateY(-5px);
}

/* Loading Screen */
#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease;
}

.loader {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  border-top-color: var(--accent-primary);
  animation: spin 1s ease-in-out infinite;
}

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

/* Responsive */
@media (max-width: 991px) {
  .hero-title {
    font-size: 3rem;
  }
  .navbar-collapse {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-top: 1rem;
  }
}

@media (max-width: 767px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .timeline::before {
    left: 20px;
  }
  .timeline-dot {
    left: 20px;
    width: 30px; height: 30px;
    font-size: 0.8rem;
  }
  .timeline-content {
    margin-left: 20px;
  }
}