/* CSS Variables for Theme Support */
:root {
  /* Light Theme Colors */
  --bg-primary: #F5F5F5;
  --bg-secondary: #FFFFFF;
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --accent-primary: #FF6F00;
  --accent-secondary: #1E3A8A;
  --accent-tertiary: #10B981;
  --border-color: #E5E7EB;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --gradient-primary: linear-gradient(135deg, #FF6F00, #F97316);
  --gradient-secondary: linear-gradient(135deg, #1E3A8A, #3B82F6);
}

[data-theme="dark"] {
  /* Dark Theme Colors */
  --bg-primary: #111827;
  --bg-secondary: #1F2937;
  --text-primary: #D1D5DB;
  --text-secondary: #9CA3AF;
  --accent-primary: #F97316;
  --accent-secondary: #2DD4BF;
  --accent-tertiary: #10B981;
  --border-color: #374151;
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.4);
  --gradient-primary: linear-gradient(135deg, #F97316, #FF6F00);
  --gradient-secondary: linear-gradient(135deg, #2DD4BF, #06B6D4);
}

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

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

body {
  font-family: 'Kantumruy Pro', 'Noto Sans Khmer', sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: all 0.3s ease;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: 1rem;
  line-height: 1.6;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(31, 41, 55, 0.95);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-logo .logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--accent-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width 0.3s ease;
}

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

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 20px;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
}

.lang-toggle:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(255, 111, 0, 0.1);
}

.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: rotate(180deg);
}

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

.hamburger .bar {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

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

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.1;
}

.particles {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.3) 2px, transparent 2px),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.3) 2px, transparent 2px),
    radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.3) 2px, transparent 2px);
  background-size: 100px 100px, 150px 150px, 120px 120px;
  animation: float 20s infinite linear;
}

@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-20px) rotate(360deg); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-text {
  color: white;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  animation: slideInLeft 1s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  animation: slideInLeft 1s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  animation: slideInLeft 1s ease-out 0.4s both;
}

.btn {
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: white;
  color: var(--accent-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-secondary:hover {
  background: white;
  color: var(--accent-primary);
}

.hero-image {
  display: flex;
  justify-content: center;
  animation: slideInRight 1s ease-out 0.6s both;
}

.profile-container {
  position: relative;
}

.profile-photo {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid white;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.profile-ring {
  position: absolute;
  top: -20px;
  left: -20px;
  width: 340px;
  height: 340px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: rotate 10s linear infinite;
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Section Styles */
section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

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

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.skills-container h3 {
  margin-bottom: 2rem;
  color: var(--accent-primary);
}

.skills-grid {
  display: grid;
  gap: 1.5rem;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-primary);
  border-radius: 8px;
  transition: transform 0.3s ease;
}

.skill-item:hover {
  transform: translateY(-2px);
}

.skill-item i {
  font-size: 2rem;
  color: var(--accent-primary);
}

.skill-level {
  flex: 1;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.skill-level::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 4px;
  width: var(--level, 0%);
  transition: width 1s ease-in-out;
}

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

.project-filters {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  border: 2px solid var(--border-color);
  background: transparent;
  color: var(--text-primary);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

.filter-btn.active,
.filter-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

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

/* Experience Section */
.experience {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: var(--accent-primary);
}

.timeline-item {
  display: flex;
  margin-bottom: 3rem;
  position: relative;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-date {
  flex: 1;
  text-align: center;
  font-weight: 600;
  color: var(--accent-primary);
  padding: 1rem;
}

.timeline-content {
  flex: 1;
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 15px var(--shadow-light);
  position: relative;
}

.timeline-content::before {
  content: '';
  position: absolute;
  top: 50%;
  width: 0;
  height: 0;
  border: 10px solid transparent;
}

.timeline-item:nth-child(odd) .timeline-content::before {
  right: -20px;
  border-left-color: var(--bg-primary);
}

.timeline-item:nth-child(even) .timeline-content::before {
  left: -20px;
  border-right-color: var(--bg-primary);
}

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

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

.contact-info h3 {
  color: var(--accent-primary);
  margin-bottom: 1rem;
}

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

.contact-method {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.contact-method i {
  color: var(--accent-primary);
  width: 20px;
}

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

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--accent-primary);
  color: white;
  border-radius: 50%;
  text-decoration: none;
  transition: transform 0.3s ease;
}

.social-link:hover {
  transform: translateY(-2px) scale(1.1);
}

.contact-form {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 15px var(--shadow-light);
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
}

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

.footer-content p {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.footer-tagline {
  color: var(--accent-primary);
  font-weight: 600;
}

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

.loader {
  text-align: center;
}

.apsara-flower {
  width: 60px;
  height: 60px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Animations */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--bg-secondary);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: 2rem 0;
  }

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

  .hamburger {
    display: flex;
  }

  .nav-controls {
    gap: 0.5rem;
  }

  .lang-toggle {
    padding: 4px 8px;
    font-size: 0.8rem;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

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

  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    flex-direction: column;
    padding-left: 40px;
  }

  .timeline-item:nth-child(odd) {
    flex-direction: column;
  }

  .timeline-content::before {
    display: none;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 200px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .nav-container {
    padding: 1rem 15px;
  }

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

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

  .profile-photo {
    width: 250px;
    height: 250px;
  }

  .profile-ring {
    width: 290px;
    height: 290px;
    top: -20px;
    left: -20px;
  }
}