/* ===============================
   CSS Variables
=============================== */
:root {
  /* Colors - Light Theme */
  --primary-color: #4361ee;
  --primary-hover: #3a56d4;
  --secondary-color: #4cc9f0;
  --accent-color: #f72585;
  --success-color: #4ade80;
  --warning-color: #fbbf24;
  --error-color: #f43f5e;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-light: #e2e8f0;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Border Radius */
  --border-radius-sm: 0.25rem;
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  --border-radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
}

/* Dark theme variables */
.dark-theme {
  --primary-color: #6366f1;
  --primary-hover: #818cf8;
  --secondary-color: #22d3ee;
  --accent-color: #f472b6;
  --success-color: #34d399;
  --warning-color: #fbbf24;
  --error-color: #fb7185;
  
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --border-light: #334155;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4), 0 8px 10px -6px rgb(0 0 0 / 0.4);
}

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

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

body {
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===============================
   Header & Navigation
=============================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 1000;
  transition: all var(--transition-normal);
  padding: 1rem 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.dark-theme .header {
  background-color: rgba(18, 18, 18, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header.scrolled {
  padding: 0.5rem 0;
  box-shadow: var(--shadow-md);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #4e54c8, #da3e7b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
}

.logo-dot {
  color: #da3e7b;
  font-size: 1.8rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

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

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover {
  color: #4e54c8;
}

.dark-theme .nav-link:hover {
  color: #da3e7b;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #4e54c8, #da3e7b);
  transition: width var(--transition-normal);
}

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

.theme-toggle-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background-color: var(--bg-tertiary);
}

.light-icon, .dark-icon {
  position: absolute;
  transition: transform 0.5s ease;
}

body:not(.dark-theme) .light-icon {
  transform: translateY(0);
  opacity: 1;
}

body:not(.dark-theme) .dark-icon {
  transform: translateY(30px);
  opacity: 0;
}

body.dark-theme .light-icon {
  transform: translateY(-30px);
  opacity: 0;
}

body.dark-theme .dark-icon {
  transform: translateY(0);
  opacity: 1;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger .bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  background-color: var(--text-primary);
  transition: all 0.3s ease-in-out;
  border-radius: var(--border-radius-full);
}

/* ===============================
   Hero Section
=============================== */
.hero-section {
  padding-top: 120px;
  padding-bottom: 80px;
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

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

.hero-content.full-width {
  grid-template-columns: 1fr;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-content.full-width .hero-buttons {
  justify-content: center;
}

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

.hero-greeting {
  font-size: 1.25rem;
  color: var(--primary-color);
  font-weight: 500;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  margin: 0;
  background: linear-gradient(90deg, #4e54c8, #da3e7b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin: 0;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin: 1.5rem 0;
  line-height: 1.7;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  text-align: center;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.hero-image-container {
  position: relative;
}

.hero-image-wrapper {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: rotate(3deg);
  transition: all var(--transition-normal);
}

.hero-image-wrapper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  opacity: 0.2;
  z-index: 1;
}

.hero-image-wrapper:hover {
  transform: rotate(0);
}

.hero-image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===============================
   About Section
=============================== */
.about {
  padding: 6rem 2rem;
  background-color: var(--bg-primary);
}

.about-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: center;
}

.about-container.full-width {
  grid-template-columns: 1fr;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-image {
  text-align: center;
  position: relative;
}

.about-image::before {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  right: 10px;
  bottom: 10px;
  border: 2px solid var(--primary-color);
  border-radius: var(--border-radius-lg);
  z-index: -1;
  transition: all 0.3s ease;
}

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

.profile-image {
  width: 100%;
  max-width: 350px;
  border-radius: 1rem;
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition-normal);
}

.profile-image:hover {
  transform: scale(1.05);
}

.about-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* ===============================
   Skills Section
=============================== */
.skills {
  padding: 6rem 2rem;
  background-color: var(--bg-secondary);
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 3rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.skill-category {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.skill-category:hover {
  transform: translateY(-5px);
}

.skill-category h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.skill-item {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.skill-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0;
  background-color: var(--primary-blue);
  opacity: 0.1;
  transition: width 1s ease;
}

.skill-item.animate::before {
  width: var(--skill-level);
}

.skill-item:hover {
  background-color: var(--primary-blue);
  color: var(--white);
  transform: translateX(5px);
}

/* ===============================
   Projects Section
=============================== */
.projects {
  padding: 6rem 2rem;
  background-color: var(--bg-primary);
}

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

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.5rem;
  margin-bottom: 4rem;
}

.project-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-blue);
}

.project-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-bottom: 1px solid var(--border-light);
}

.project-content {
  padding: 1.5rem 2rem 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.project-tech {
  color: var(--primary-blue);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-link {
  flex: 1;
  padding: 0.75rem 1rem;
  background-color: transparent;
  color: var(--primary-blue);
  border: 1px solid var(--primary-blue);
  border-radius: 0.5rem;
  text-decoration: none;
  text-align: center;
  font-weight: 500;
  transition: all var(--transition-normal);
}

.project-link:hover {
  background-color: var(--primary-blue);
  color: var(--white);
}

.github-section {
  text-align: center;
  padding: 3rem;
  background-color: var(--bg-secondary);
  border-radius: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-blue);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: color var(--transition-normal);
}

.github-link:hover {
  color: var(--secondary-blue);
}

/* ===============================
   Contact Section
=============================== */
.contact {
  padding: 6rem 2rem;
  background-color: var(--bg-secondary);
}

.contact-container {
  max-width: 900px;
  margin: 0 auto;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 1.5rem;
  padding: 3rem;
  box-shadow: var(--shadow-xl);
}

.contact-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 1rem;
}

.contact-subtitle {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 3rem;
  font-size: 1.1rem;
  line-height: 1.6;
}

.contact-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: 1rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.contact-option:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  background-color: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
}

.contact-option i {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--primary-blue);
  transition: color var(--transition-normal);
}

.contact-option:hover i {
  color: var(--white);
}

.contact-option h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  transition: color var(--transition-normal);
}

.contact-option p {
  font-size: 0.9rem;
  opacity: 0.8;
  transition: all var(--transition-normal);
}

.contact-option:hover p {
  opacity: 1;
  color: var(--white);
}

/* Contact Form */
.contact-form {
  background-color: var(--bg-secondary);
  padding: 2.5rem;
  border-radius: 1rem;
  border: 1px solid var(--border-light);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-control {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--border-medium);
  border-radius: 0.5rem;
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition-normal);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.submit-button {
  width: 100%;
  padding: 1rem 2rem;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.submit-button:hover {
  background-color: var(--secondary-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Form validation styles */
.validation-feedback {
  font-size: 0.85rem;
  color: #e53e3e;
  margin-top: 0.25rem;
  min-height: 1.25rem;
}

.invalid-input {
  border-color: #e53e3e !important;
  box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1) !important;
}

/* ===============================
   Footer
=============================== */
.footer {
  background-color: var(--gray-900);
  color: var(--gray-300);
  padding: 2rem;
  text-align: center;
}

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

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

.footer-links a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-links a:hover {
  color: var(--white);
}

/* ===============================
   Notification
=============================== */
#notification {
  position: fixed;
  top: 100px;
  right: 20px;
  padding: 1rem 1.5rem;
  background-color: var(--primary-blue);
  color: var(--white);
  border-radius: 0.5rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-normal);
  z-index: 9999;
  max-width: 300px;
}

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

/* ===============================
   Responsive Design
=============================== */
/* Higher resolution optimization */
@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
    margin: 0 auto;
  }
  
  .hero-section {
    padding-top: 120px;
    padding-bottom: 120px;
  }
  
  .hero-title {
    font-size: 4.5rem;
  }
  
  .hero-subtitle {
    font-size: 2.25rem;
  }
  
  .hero-description {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto;
  }
  
  .section {
    padding: 100px 0;
  }
  
  .section-title {
    font-size: 3rem;
    margin-bottom: 3rem;
  }
}

@media (max-width: 1024px) {
  .hero-content {
    gap: 2rem;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.75rem;
  }
}

@media (max-width: 768px) {
  /* Navigation */
  .header {
    padding: 0.75rem 0;
  }
  
  .nav-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-light);
    flex-direction: column;
    gap: 0;
    padding: 2rem 0;
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-link {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
    text-align: center;
  }
  
  .nav-link::after {
    display: none;
  }

  .hamburger {
    display: block;
  }
  
  /* Hero section */
  .hero-section {
    padding-top: 100px;
    padding-bottom: 60px;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-text {
    order: 2;
  }
  
  .hero-image-container {
    order: 1;
    max-width: 350px;
    margin: 0 auto;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.5rem;
  }
  
  .hero-buttons {
    justify-content: center;
  }

  /* Layout adjustments */
  .about-container,
  .skills-grid,
  .project-grid,
  .contact-options {
    grid-template-columns: 1fr;
  }
  
  .about-container {
    gap: 2rem;
    text-align: center;
  }

  /* Contact section */
  .contact-container {
    margin: 0 1rem;
    padding: 2rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  /* Typography */
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }
  
  .section-title::after {
    width: 60px;
    height: 3px;
  }

  /* Component spacing */
  .section {
    padding: 3rem 0;
  }
  
  .skill-category,
  .project-card,
  .contact-form {
    padding: 1.5rem;
  }
  
  /* Buttons */
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
}