/* ===== CSS Custom Properties (Theming) ===== */
:root {
  /* Dark Theme (Default) */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-card: #141414;
  
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  --accent-primary: #3b82f6;
  --accent-secondary: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.3);
  
  --navy: #011F3F;
  --cream: #FEF2BF;
  --highlight: #64ffda;
  
  --border-color: #27272a;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --card-hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  
  /* Spacing */
  --section-padding: 100px 0;
  --container-max-width: 1100px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --accent-primary: #2563eb;
  --accent-secondary: #3b82f6;
  --accent-glow: rgba(37, 99, 235, 0.2);
  
  --highlight: #0d9488;
  
  --border-color: #e2e8f0;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --card-hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
}

/* ===== Base Styles ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

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

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--accent-secondary);
}

.highlight {
  color: var(--highlight);
  font-weight: 500;
}

/* ===== Container ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 25px;
}

/* ===== Section Styles ===== */
.section {
  padding: var(--section-padding);
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
  max-width: 300px;
}

.section-number {
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 400;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-base);
}

[data-theme="light"] .navbar {
  background-color: rgba(255, 255, 255, 0.9);
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 25px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.nav-logo:hover {
  color: var(--accent-secondary);
}

.logo-text {
  transition: color var(--transition-fast);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 10px 15px;
  color: var(--text-secondary);
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-primary);
  background-color: var(--accent-glow);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
}

.hamburger {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--text-primary);
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: var(--text-primary);
  left: 0;
  transition: transform var(--transition-fast);
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

.nav-toggle.active .hamburger {
  background-color: transparent;
}

.nav-toggle.active .hamburger::before {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active .hamburger::after {
  transform: translateY(-8px) rotate(-45deg);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

.theme-toggle .fa-sun {
  display: none;
}

[data-theme="light"] .theme-toggle .fa-moon {
  display: none;
}

[data-theme="light"] .theme-toggle .fa-sun {
  display: inline;
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 25px;
  max-width: var(--container-max-width);
  margin: 0 auto;
  position: relative;
}

.hero-content {
  max-width: 700px;
}

.hero-greeting {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 1rem;
  margin-bottom: 20px;
}

.hero-name {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.hero-title {
  font-size: clamp(1.8rem, 6vw, 3.5rem);
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 25px;
}

.hero-description {
  font-size: 1.1rem;
  max-width: 540px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.hero-scroll-indicator a {
  color: var(--text-muted);
  font-size: 1.5rem;
  transition: color var(--transition-fast);
}

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

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background-color: transparent;
  border: 2px solid var(--accent-primary);
  color: var(--accent-primary);
}

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

.btn-secondary {
  background-color: transparent;
  border: 2px solid var(--text-muted);
  color: var(--text-secondary);
}

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

.btn-large {
  padding: 18px 36px;
  font-size: 1rem;
}

/* ===== About Section ===== */
.about-content {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 50px;
  align-items: start;
}

.about-text p {
  margin-bottom: 1.2rem;
}

.about-list {
  list-style: none;
  margin: 1.5rem 0;
}

.about-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.about-list li i {
  color: var(--accent-primary);
  margin-top: 4px;
  font-size: 0.9rem;
}

.about-image {
  position: relative;
}

.image-wrapper {
  position: relative;
}

.image-wrapper::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 20px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--accent-primary);
  border-radius: 12px;
  z-index: -1;
  transition: all var(--transition-base);
}

.image-wrapper:hover::before {
  top: 15px;
  left: 15px;
}

.image-placeholder {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-tertiary);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 15px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border: 1px dashed var(--border-color);
}

.image-placeholder i {
  font-size: 3rem;
  color: var(--accent-primary);
}

/* ===== Experience Section ===== */
.experience-container {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.experience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  transition: all var(--transition-base);
}

.experience-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--card-hover-shadow);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.experience-role {
  font-size: 1.3rem;
  color: var(--text-primary);
}

.experience-company {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent-primary);
}

.experience-company a {
  color: inherit;
}

.experience-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.experience-list {
  list-style: none;
  margin-bottom: 20px;
}

.experience-list li {
  display: flex;
  gap: 15px;
  margin-bottom: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.experience-list li i {
  color: var(--accent-primary);
  margin-top: 6px;
  font-size: 0.7rem;
}

.experience-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 6px 12px;
  background: var(--accent-glow);
  color: var(--accent-primary);
  border-radius: 4px;
}

/* ===== Projects Section ===== */
.featured-projects {
  margin-bottom: 60px;
}

.project-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  align-items: center;
  margin-bottom: 60px;
}

.project-featured-reverse {
  direction: rtl;
}

.project-featured-reverse > * {
  direction: ltr;
}

.project-overline {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  margin-bottom: 10px;
}

.project-title {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.project-description {
  background: var(--bg-card);
  padding: 25px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 20px;
}

.project-description p {
  margin: 0;
}

.project-tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.project-links {
  display: flex;
  gap: 20px;
}

.project-links a {
  color: var(--text-secondary);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color var(--transition-fast);
}

.project-links a:hover {
  color: var(--accent-primary);
}

.project-image {
  position: relative;
}

.project-image-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--bg-tertiary);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 15px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border: 1px dashed var(--border-color);
  transition: all var(--transition-base);
}

.project-image-placeholder i {
  font-size: 2.5rem;
  color: var(--accent-primary);
}

.project-image-placeholder:hover {
  border-color: var(--accent-primary);
  background: var(--accent-glow);
}

.projects-subtitle {
  font-size: 1.3rem;
  text-align: center;
  margin-bottom: 40px;
  color: var(--text-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-primary);
  box-shadow: var(--card-hover-shadow);
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 25px;
}

.project-card-icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 10px;
}

.project-card-icon i {
  font-size: 1.5rem;
  color: var(--accent-primary);
}

.project-card-links {
  display: flex;
  gap: 15px;
}

.project-card-links a {
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: color var(--transition-fast);
}

.project-card-links a:hover {
  color: var(--accent-primary);
}

.project-card-title {
  font-size: 1.2rem;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.project-card-title:hover {
  color: var(--accent-primary);
}

.project-card-description {
  flex: 1;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.project-card-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* ===== Skills Section ===== */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 25px;
  transition: all var(--transition-base);
}

.skill-category:hover {
  border-color: var(--accent-primary);
}

.skill-category-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

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

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 8px 14px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 6px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-glow);
}

/* ===== Education Section ===== */
.education-container {
  max-width: 800px;
  margin: 0 auto;
}

.education-card {
  display: flex;
  gap: 25px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  margin-bottom: 40px;
  transition: all var(--transition-base);
}

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

.education-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 12px;
  flex-shrink: 0;
}

.education-icon i {
  font-size: 1.8rem;
  color: var(--accent-primary);
}

.education-degree {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.education-school {
  font-size: 1rem;
  color: var(--accent-primary);
  font-weight: 500;
  margin-bottom: 8px;
}

.education-date,
.education-details {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.achievements-title {
  font-size: 1.3rem;
  text-align: center;
  margin-bottom: 30px;
  color: var(--text-primary);
}

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

.achievement-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 25px;
  text-align: center;
  transition: all var(--transition-base);
}

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

.achievement-rank {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 10px;
}

.achievement-exam {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.achievement-details {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== Contact Section ===== */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-text {
  font-size: 1.1rem;
  margin-bottom: 40px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 40px;
}

.contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  padding: 15px 25px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

.contact-link:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-glow);
}

.contact-link i {
  font-size: 1.3rem;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 25px;
}

.footer-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 25px;
  margin-bottom: 20px;
}

.footer-social a {
  color: var(--text-muted);
  font-size: 1.3rem;
  transition: all var(--transition-base);
}

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

.footer-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.footer-copyright {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Animations ===== */
.animate-fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in-delay-1 {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease 0.1s forwards;
}

.animate-fade-in-delay-2 {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease 0.2s forwards;
}

.animate-fade-in-delay-3 {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease 0.3s forwards;
}

.animate-fade-in-delay-4 {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease 0.4s forwards;
}

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

/* Scroll-triggered animations */
.section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .about-image {
    max-width: 300px;
    margin: 0 auto;
  }
  
  .project-featured {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  
  .project-featured-reverse {
    direction: ltr;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 70px 0;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-link {
    padding: 15px;
    text-align: center;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .experience-header {
    flex-direction: column;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .achievements-grid {
    grid-template-columns: 1fr;
  }
  
  .education-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }
  
  .hero {
    padding: 0 15px;
  }
  
  .section-title {
    font-size: 1.3rem;
  }
  
  .experience-card,
  .project-card,
  .skill-category,
  .education-card,
  .achievement-card {
    padding: 20px;
  }
}