/* ============================================
   Portfolio Website - Stylesheet
   Dark Theme (Default) & Light Theme Support
   ============================================ */

/* Root CSS Variables for Easy Theme Switching */
:root {
  /* Dark Theme (Default) */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #3a3a3a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --text-tertiary: #888888;
  --accent-color: #0d6efd;
  --accent-hover: #0b5ed7;
  --border-color: #404040;
  --card-bg: #252525;
  --navbar-bg: #1a1a1a;
  --navbar-border: #404040;
}

/* Light Theme */
body.light-theme {
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f0f0f0;
  --text-primary: #1a1a1a;
  --text-secondary: #555555;
  --text-tertiary: #888888;
  --accent-color: #0d6efd;
  --accent-hover: #0b5ed7;
  --border-color: #e0e0e0;
  --card-bg: #ffffff;
  --navbar-bg: #ffffff;
  --navbar-border: #e0e0e0;
}

/* ============================================
   Global Styles
   ============================================ */

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

html, body {
  height: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

main {
  min-height: calc(100vh - 120px);
  padding-top: 80px;
  padding-bottom: 40px;
}

/* ============================================
   Navigation Bar Styles
   ============================================ */

.navbar {
  background-color: var(--navbar-bg) !important;
  border-bottom: 1px solid var(--navbar-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color) !important;
  transition: color 0.3s ease;
}

.navbar-brand:hover {
  color: var(--accent-hover) !important;
}

.nav-link {
  color: var(--text-primary) !important;
  margin-left: 0.5rem;
  margin-right: 0.5rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Theme Toggle Button */
.theme-toggle {
  background: transparent;
  border: 2px solid var(--accent-color);
  color: var(--accent-color);
  padding: 0.5rem 1rem;
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.3s ease;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle:hover {
  background-color: var(--accent-color);
  color: #ffffff;
  transform: translateY(-2px);
}

.theme-toggle i {
  font-size: 1.1rem;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  text-align: center;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  padding: 40px 20px;
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--accent-color);
  animation: fadeInDown 0.8s ease;
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-buttons {
  animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-buttons .btn {
  margin: 0 10px;
  padding: 12px 30px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 50px;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(13, 110, 253, 0.3);
}

.btn-outline-light {
  border-color: var(--text-secondary);
  color: var(--text-secondary);
}

.btn-outline-light:hover {
  background-color: var(--text-secondary);
  color: var(--bg-primary);
  transform: translateY(-3px);
}

.btn-outline-primary {
  border-color: var(--accent-color) !important;
  color: var(--accent-color) !important;
  transition: all 0.3s ease;
}

.btn-outline-primary:hover {
  background-color: var(--accent-color) !important;
  color: #ffffff !important;
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(13, 110, 253, 0.3);
}

/* ============================================
   Content Sections
   ============================================ */

.section {
  padding: 60px 20px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  color: var(--accent-color);
  position: relative;
  padding-bottom: 20px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--accent-color);
  border-radius: 2px;
}

.subsection-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 30px;
  margin-bottom: 20px;
  color: var(--text-primary);
}

/* ============================================
   About Section
   ============================================ */

.about-container {
  max-width: 900px;
  margin: 0 auto;
}

.about-header {
  text-align: center;
  margin-bottom: 50px;
}

.about-header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  color: var(--accent-color);
}

.about-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.info-card {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.info-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: 0 8px 16px rgba(13, 110, 253, 0.2);
}

.info-card h3 {
  color: var(--accent-color);
  margin-bottom: 10px;
  font-size: 1.1rem;
  font-weight: 600;
}

.info-card p {
  color: var(--text-secondary);
  line-height: 1.8;
}

.hobbies-list {
  list-style: none;
  padding: 0;
}

.hobbies-list li {
  padding: 10px 0;
  color: var(--text-secondary);
  padding-left: 25px;
  position: relative;
}

.hobbies-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-color);
  font-weight: bold;
  font-size: 1.2rem;
}

/* ============================================
   Skills Section
   ============================================ */

.skills-container {
  max-width: 1000px;
  margin: 0 auto;
}

.skill-category {
  margin-bottom: 50px;
}

.skill-category h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 25px;
  color: var(--accent-color);
  padding-bottom: 15px;
  border-bottom: 2px solid var(--border-color);
}

.skill-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.skill-item {
  background-color: var(--card-bg);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all 0.3s ease;
  cursor: default;
}

.skill-item:hover {
  background-color: var(--bg-tertiary);
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: 0 8px 16px rgba(13, 110, 253, 0.2);
}

.skill-item p {
  color: var(--text-secondary);
  font-weight: 500;
  margin: 0;
}

/* ============================================
   Projects Section
   ============================================ */

.projects-container {
  max-width: 1100px;
  margin: 0 auto;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.project-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-color);
  box-shadow: 0 12px 24px rgba(13, 110, 253, 0.2);
}

.project-card-header {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
  color: #ffffff;
  padding: 40px 20px;
  text-align: center;
  font-size: 1.8rem;
  font-weight: 700;
}

.project-card-body {
  padding: 25px;
  flex-grow: 1;
}

.project-card-body h3 {
  color: var(--accent-color);
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.project-card-body p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 15px;
}

.placeholder-message {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 1.2rem;
}

.placeholder-icon {
  font-size: 4rem;
  color: var(--accent-color);
  margin-bottom: 20px;
  opacity: 0.6;
}

/* ============================================
   Certifications Section
   ============================================ */

.certifications-container {
  max-width: 1000px;
  margin: 0 auto;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
}

.cert-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s ease;
}

.cert-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: 0 8px 16px rgba(13, 110, 253, 0.2);
}

.cert-icon {
  font-size: 3rem;
  color: var(--accent-color);
  margin-bottom: 15px;
}

/* ============================================
   Contact Section
   ============================================ */

.contact-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.contact-card {
  background-color: var(--card-bg);
  padding: 40px 30px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.contact-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: 0 8px 16px rgba(13, 110, 253, 0.2);
}

.contact-icon {
  font-size: 2.5rem;
  color: var(--accent-color);
  margin-bottom: 15px;
}

.contact-card h3 {
  color: var(--accent-color);
  margin-bottom: 10px;
  font-size: 1.2rem;
  font-weight: 600;
}

.contact-card a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.3s ease;
}

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

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

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

  .subsection-title {
    font-size: 1.3rem;
  }

  .about-info {
    grid-template-columns: 1fr;
  }

  .skill-list {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-info {
    grid-template-columns: 1fr;
  }

  .navbar {
    padding: 10px 0 !important;
  }

  .theme-toggle {
    margin-top: 10px;
    margin-left: 0;
  }

  nav {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  .hero {
    min-height: auto;
    padding: 60px 20px;
  }

  .section {
    padding: 40px 15px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .skill-list {
    grid-template-columns: 1fr;
  }

  .hero-buttons .btn {
    display: block;
    width: 100%;
    margin: 10px 0;
  }
}