/* 
 * chayev.com - Premium Personal Website
 * Theme: Dark Mode, Tech-focused, Clean
 */

:root {
  /* Colors */
  --bg-primary: #0a0f1c;
  /* Deep Navy/Black */
  --bg-secondary: #111827;
  /* Slightly lighter for cards */
  --bg-tertiary: #1f2937;
  /* Borders/Inputs */

  --text-primary: #f9fafb;
  /* Near White */
  --text-secondary: #9ca3af;
  /* Muted Grey */
  --text-accent: #38bdf8;
  /* Sky Blue */
  --text-success: #34d399;
  /* Emerald Green */

  --accent-primary: #05b052;
  /* Brand Green */
  --accent-glow: rgba(5, 176, 82, 0.4);

  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

section {
  padding: var(--spacing-xl) 0;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 15, 28, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--bg-tertiary);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height: 40px;
  width: auto;
}

.logo span {
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width var(--transition-normal);
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: 60px;
  /* Offset for fixed nav */
}

/* Dynamic Background Glow */
.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, rgba(0, 0, 0, 0) 70%);
  opacity: 0.5;
  z-index: -1;
  animation: pulse 10s infinite;
}

@keyframes pulse {
  0% {
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0.4;
  }

  50% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 0.6;
  }

  100% {
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0.4;
  }
}

.hero-content {
  max-width: 800px;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-primary);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 0 20px var(--accent-glow);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.hero-greeting {
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: block;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.2s;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  letter-spacing: -1px;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.4s;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.6s;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background: var(--accent-primary);
  color: #fff;
  border-radius: 6px;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid var(--accent-primary);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.8s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-glow);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--bg-tertiary);
  margin-left: var(--spacing-md);
}

.btn-secondary:hover {
  border-color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: none;
}

/* About Section Styles */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.experience-item {
  position: relative;
  padding-left: var(--spacing-lg);
  border-left: 2px solid var(--bg-tertiary);
  padding-bottom: var(--spacing-lg);
}

.experience-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  transition: background var(--transition-fast);
}

.experience-item:hover::before {
  background: var(--accent-primary);
}

.exp-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-accent);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.exp-role {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.exp-company {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.exp-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.tech-tag {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid var(--bg-tertiary);
  transition: all var(--transition-fast);
}

.tech-tag:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--bg-tertiary);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

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

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.project-desc {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  min-height: 60px;
}

.project-link {
  color: var(--accent-primary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* About Image */
.about-img-container {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.about-img {
  width: 100%;
  max-width: 400px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--bg-tertiary);
}

/* Contact Form */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  background: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border: 1px solid var(--bg-tertiary);
}

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

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  font-weight: 500;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--bg-tertiary);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-main);
  transition: border-color var(--transition-fast);
}

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

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
footer {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  border-top: 1px solid var(--bg-tertiary);
  margin-top: var(--spacing-xl);
}

/* Animations */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

/* Mobile Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .navbar .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    border-bottom: 1px solid var(--bg-tertiary);
  }

  .navbar .nav-links.mobile-open {
    transform: translateY(0);
  }

  .mobile-menu-btn {
    display: block;
  }
}