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

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1a1a1a;
  --accent-primary: #0369a1;
  --accent-secondary: #06b6d4;
  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-tertiary: #737373;
  --border: #262626;
  --success: #10b981;
  --warning: #f59e0b;
  --gradient: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: 1rem 0;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
  margin-left: auto;
  list-style: none;
}

.nav-links li {
  display: inline;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
  font-size: 0.875rem;
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 2.5rem;
  height: 2.5rem;
  margin-left: auto;
}

.mobile-menu-btn span {
  width: 1.5rem;
  height: 2px;
  background: var(--text-primary);
  margin: 2px 0;
  transition: all 0.3s ease;
  transform-origin: center;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Main Content */
main {
  width: 100%;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 0 2rem;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
      circle at 20% 80%,
      rgba(14, 165, 233, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(6, 182, 212, 0.15) 0%,
      transparent 50%
    );
  pointer-events: none;
}

.hero-content {
  max-width: 1200px;
  width: 100%;
  z-index: 1;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(
    to right,
    var(--text-primary) 0%,
    var(--text-secondary) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

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

.tech-badge {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}

section h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

.tech-badge:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.cta-button {
  background: var(--gradient);
  color: white;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  display: inline-block;
  font-weight: 500;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(14, 165, 233, 0.3);
}

/* Projects Section */
.projects {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--text-secondary);
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-tab {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.5rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.875rem;
  font-family: inherit;
}

.filter-tab:hover {
  border-color: var(--accent-primary);
}

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

/* Bento Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-card.featured {
  grid-column: span 2;
  grid-row: span 2;
}

.project-card.large {
  grid-column: span 2;
}

.project-card.full-width {
  grid-column: span 4;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.project-tech {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

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

.project-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s;
}

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

/* Regular Grid */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.social-links {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.social-links a {
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

/* Responsive */
@media (max-width: 1024px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .project-card.featured,
  .project-card.large {
    grid-column: span 2;
    grid-row: span 1;
  }
}

@media (max-width: 640px) {
  /* Mobile Navigation */
  .mobile-menu-btn {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 2rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-links li {
    width: 100%;
  }
  
  .nav-links a {
    display: block;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 1rem;
  }
  
  .nav-links li:last-child a {
    border-bottom: none;
  }
  
  /* Grid Layout */
  .bento-grid {
    grid-template-columns: 1fr;
  }
  
  .project-card.featured,
  .project-card.large,
  .project-card.full-width {
    grid-column: span 1;
    grid-row: span 1;
  }
  
  /* Typography */
  .hero h1 {
    font-size: 2rem;
  }
}