/* ============================================================================
   Modern Portfolio Website - CSS Styles
   ============================================================================ */

/* CSS Custom Properties */
:root {
  /* Color Palette - Elegant & Soft */
  --primary-color: #6b7280;        /* Slate gray */
  --secondary-color: #a7f3d0;      /* Soft mint */
  --accent-color: #fbbf24;         /* Warm amber */
  --text-primary: #1f2937;         /* Dark slate */
  --text-secondary: #6b7280;       /* Medium slate */
  --text-light: #9ca3af;           /* Light slate */
  --bg-primary: #ffffff;           /* White */
  --bg-secondary: #f9fafb;         /* Very light gray */
  --bg-accent: #f3f4f6;            /* Light gray */
  --border-color: #e5e7eb;         /* Light border */
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Dark Theme Colors */
  --dark-primary: #111827;         /* Very dark gray */
  --dark-secondary: #1f2937;       /* Dark gray */
  --dark-accent: #374151;          /* Medium dark gray */
  --dark-text-primary: #f9fafb;    /* Light text */
  --dark-text-secondary: #d1d5db;  /* Medium light text */
  --dark-border: #374151;          /* Dark border */
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-medium: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-color: #6b7280;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --text-primary: var(--dark-text-primary);
  --text-secondary: var(--dark-text-secondary);
  --text-light: #9ca3af;
  --bg-primary: var(--dark-primary);
  --bg-secondary: var(--dark-secondary);
  --bg-accent: var(--dark-accent);
  --border-color: var(--dark-border);
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-heavy: 0 20px 25px rgba(0, 0, 0, 0.3);
}

/* ============================================================================
   Base Styles
   ============================================================================ */

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

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ============================================================================
   Typography
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
  margin: var(--spacing-sm) auto 0;
  border-radius: var(--radius-sm);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  color: var(--text-primary);
  box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-heavy);
}

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

.btn-secondary:hover {
  background: var(--bg-accent);
  transform: translateY(-2px);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.875rem;
}

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

.btn-full {
  width: 100%;
}

/* ============================================================================
   Navigation
   ============================================================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-medium);
}

[data-theme="dark"] .navbar {
  background: rgba(17, 24, 39, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo a {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary-color);
  transition: width var(--transition-medium);
}

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

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

.bar {
  width: 25px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-medium);
}

.theme-toggle {
  background: var(--bg-accent);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
  cursor: pointer;
  font-size: 1.2rem;
  transition: all var(--transition-medium);
  margin-left: var(--spacing-sm);
}

.theme-toggle:hover {
  background: var(--secondary-color);
}

.theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: inline;
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  width: 100%;
}

.hero-content {
  animation: fadeInUp 1s ease-out;
}

.hero-greeting {
  display: block;
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  font-family: var(--font-primary);
  font-weight: 400;
}

.hero-name {
  display: block;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 500px;
  animation: fadeInRight 1s ease-out 0.3s both;
}

.hero-background-shape {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  border-radius: 50%;
  opacity: 0.1;
  animation: float 6s ease-in-out infinite;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--text-secondary);
  border-bottom: 2px solid var(--text-secondary);
  transform: rotate(45deg);
}

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

.about {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-text {
  animation: fadeInLeft 1s ease-out;
}

.about-description {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.about-highlights {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.highlight {
  text-align: center;
}

.highlight-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--secondary-color);
  font-family: var(--font-heading);
}

.highlight-text {
  font-size: 0.9rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.about-image {
  position: relative;
  animation: fadeInRight 1s ease-out 0.2s both;
}

.image-placeholder {
  width: 300px;
  height: 400px;
  background: linear-gradient(135deg, var(--bg-accent), var(--secondary-color));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-heavy);
  position: relative;
  overflow: hidden;
}

.profile-image {
  font-size: 4rem;
  animation: wave 2s ease-in-out infinite;
}

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

.skills {
  padding: var(--spacing-2xl) 0;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.skill-card {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  animation: fadeInUp 1s ease-out;
}

.skill-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-heavy);
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.skill-title {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.skill-list {
  list-style: none;
}

.skill-list li {
  color: var(--text-secondary);
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid var(--border-color);
  transition: color var(--transition-fast);
}

.skill-list li:last-child {
  border-bottom: none;
}

.skill-list li:hover {
  color: var(--text-primary);
}

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

.projects {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-light);
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  animation: fadeInUp 1s ease-out;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-heavy);
}

.project-image {
  position: relative;
  height: 250px;
  overflow: hidden;
}

.project-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: white;
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-medium);
}

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

.project-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.project-content {
  padding: var(--spacing-md);
}

.project-title {
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.project-description {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tech-tag {
  background: var(--bg-accent);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
}

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

.contact {
  padding: var(--spacing-2xl) 0;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.contact-info {
  animation: fadeInLeft 1s ease-out;
}

.contact-description {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
}

.contact-details {
  margin-bottom: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.contact-icon {
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  background: var(--bg-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-text {
  display: flex;
  flex-direction: column;
}

.contact-label {
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 500;
}

.contact-value {
  color: var(--text-primary);
  font-weight: 500;
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-link {
  width: 50px;
  height: 50px;
  background: var(--bg-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  text-decoration: none;
  transition: all var(--transition-medium);
}

.social-link:hover {
  background: var(--secondary-color);
  transform: translateY(-3px);
}

/* ============================================================================
   Contact Form
   ============================================================================ */

.contact-form {
  background: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  animation: fadeInRight 1s ease-out 0.2s both;
}

.form-group {
  position: relative;
  margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: all var(--transition-medium);
}

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

.form-group label {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  color: var(--text-light);
  transition: all var(--transition-medium);
  pointer-events: none;
  background: var(--bg-primary);
  padding: 0 var(--spacing-xs);
}

.form-group input:focus + label,
.form-group textarea:focus + label,
.form-group input:valid + label,
.form-group textarea:valid + label {
  top: -8px;
  font-size: 0.8rem;
  color: var(--secondary-color);
}

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

/* ============================================================================
   Footer
   ============================================================================ */

.footer {
  background: var(--bg-accent);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-text {
  color: var(--text-secondary);
  margin: 0;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--text-primary);
}

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

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

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

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

@keyframes float {
  0%, 100% { transform: translate(-50%, -50%) translateY(0px); }
  50% { transform: translate(-50%, -50%) translateY(-20px); }
}

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

@keyframes wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(5deg); }
  75% { transform: rotate(-5deg); }
}

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

@media (max-width: 768px) {
  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: start;
    align-items: center;
    padding-top: var(--spacing-xl);
    transition: left var(--transition-medium);
    border-top: 1px solid var(--border-color);
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

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

  .nav-toggle.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }

  /* Hero */
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-md);
  }

  .hero-visual {
    height: 300px;
    order: -1;
  }

  .hero-background-shape {
    width: 250px;
    height: 250px;
  }

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

  /* About */
  .about-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-md);
  }

  .about-highlights {
    justify-content: center;
    gap: var(--spacing-md);
  }

  .image-placeholder {
    width: 250px;
    height: 300px;
    margin: 0 auto;
  }

  /* Skills */
  .skills-grid {
    grid-template-columns: 1fr;
  }

  /* Projects */
  .projects-grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .contact-form {
    order: -1;
  }

  /* Footer */
  .footer-content {
    text-align: center;
    justify-content: center;
  }
}

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

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

  .btn {
    width: 100%;
    max-width: 280px;
  }

  .about-highlights {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

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

/* ============================================================================
   Accessibility & Performance
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for accessibility */
button:focus,
a:focus,
input:focus,
textarea:focus {
  outline: 2px solid var(--secondary-color);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .navbar,
  .hero-buttons,
  .contact-form,
  .theme-toggle {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}

/* Utility classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}