/* ============================================
   PORTFOLIO MAIN STYLES
   Modern, Professional Design System
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Colors - Dark Theme with Vibrant Accents */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #2a2a2a;

  --color-text-primary: #ffffff;
  --color-text-secondary: #b0b0b0;
  --color-text-muted: #808080;

  --color-accent-red: #ff3366;
  --color-accent-blue: #00d4ff;
  --color-accent-green: #00ff88;
  --color-accent-white: #ffffff;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-red) 0%, var(--color-accent-blue) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-green) 100%);
  --gradient-hero: linear-gradient(135deg, #ff3366 0%, #00d4ff 50%, #00ff88 100%);

  /* Glassmorphism */
  --glass-bg: rgba(26, 26, 26, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  --font-size-xs: 0.875rem;
  --font-size-sm: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2rem;
  --font-size-2xl: 3rem;
  --font-size-3xl: 4rem;

  /* Borders */
  --border-radius-sm: 0.5rem;
  --border-radius-md: 1rem;
  --border-radius-lg: 1.5rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-index */
  --z-header: 1000;
  --z-modal: 2000;
  --z-tooltip: 3000;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

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

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

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

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

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

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

.section-title h2 {
  font-size: var(--font-size-2xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--spacing-sm) auto 0;
  border-radius: 2px;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--glass-shadow);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-link {
  color: var(--color-text-primary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::before,
.nav-link.active::before {
  width: 80%;
}

.nav-link:hover {
  color: var(--color-accent-blue);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-hero);
  opacity: 0.1;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

  0%,
  100% {
    transform: scale(1) rotate(0deg);
  }

  50% {
    transform: scale(1.2) rotate(5deg);
  }
}

.hero-content {
  text-align: center;
  z-index: 1;
  position: relative;
}

.hero-greeting {
  font-size: var(--font-size-md);
  color: var(--color-accent-blue);
  margin-bottom: var(--spacing-sm);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  margin-bottom: var(--spacing-sm);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-subtitle {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.4s forwards;
}

.hero-description {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.6s forwards;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.8s forwards;
}

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

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

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
  font-size: var(--font-size-sm);
  text-align: center;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  box-shadow: 0 4px 15px rgba(255, 51, 102, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 51, 102, 0.4);
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
}

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

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

.btn-outline:hover {
  background: var(--glass-bg);
  border-color: var(--color-accent-blue);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent-blue);
  box-shadow: 0 10px 30px rgba(0, 212, 255, 0.2);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: contain;
  object-position: center;
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-sm);
  background: var(--color-bg-secondary);
}

.card-content {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

.card-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  flex-grow: 1;
}

/* ============================================
   GRID LAYOUTS
   ============================================ */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skill-category {
  margin-bottom: var(--spacing-lg);
}

.skill-category h3 {
  margin-bottom: var(--spacing-md);
  color: var(--color-accent-blue);
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-sm);
}

.skill-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm);
  text-align: center;
  transition: all var(--transition-fast);
}

.skill-item:hover {
  border-color: var(--color-accent-green);
  transform: translateY(-3px);
}

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

.skill-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.project-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-image {
  width: 100%;
  height: 250px;
  object-fit: contain;
  object-position: center;
  border-radius: var(--border-radius-sm);
  transition: transform var(--transition-slow);
  background: var(--color-bg-secondary);
  flex-shrink: 0;
}

.project-card:hover .project-image {
  transform: scale(1.02);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin: var(--spacing-sm) 0;
}

.tag {
  background: var(--color-bg-tertiary);
  color: var(--color-accent-blue);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  border: 1px solid var(--color-accent-blue);
  white-space: nowrap;
}

.project-links {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: auto;
  padding-top: var(--spacing-sm);
  flex-wrap: wrap;
}

.project-links .btn {
  flex: 1;
  min-width: 120px;
}

/* Filter Buttons */
.filter-btn {
  margin: 0.25rem;
  padding: 0.5rem 1rem;
  white-space: nowrap;
}

.filter-btn.active {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  border-color: transparent;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.contact-item:hover {
  border-color: var(--color-accent-blue);
  transform: translateX(5px);
}

.contact-icon {
  font-size: var(--font-size-xl);
  color: var(--color-accent-blue);
}

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

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

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

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--glass-border);
  padding: var(--spacing-lg) 0 var(--spacing-md);
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--gradient-primary);
  border-color: transparent;
  transform: translateY(-3px);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    flex-direction: column;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md);
    transition: left var(--transition-normal);
    border-bottom: 1px solid var(--glass-border);
  }

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

  .contact-container {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.5rem;
  }

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

@media (max-width: 480px) {
  :root {
    --font-size-3xl: 2.5rem;
    --font-size-2xl: 2rem;
    --spacing-xl: 3rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .filter-btn {
    font-size: 0.875rem;
    padding: 0.4rem 0.8rem;
  }

  .project-links {
    flex-direction: column;
  }

  .project-links .btn {
    width: 100%;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
  text-align: center;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

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

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

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}