/* ===================================
   DESIGN SYSTEM & CSS VARIABLES
   =================================== */

:root {
  /* Colors */
  --color-bg-primary: #0a0e27;
  --color-bg-secondary: #0f1433;
  --color-surface: rgba(255, 255, 255, 0.05);
  --color-surface-hover: rgba(255, 255, 255, 0.08);

  /* Accent Colors */
  --color-accent-cyan: #00d4ff;
  --color-accent-blue: #4d7cff;
  --color-accent-purple: #a855f7;

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #b4b8d4;
  --color-text-muted: #6b7199;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-cyan) 0%, var(--color-accent-blue) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-purple) 100%);
  --gradient-bg: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
  --shadow-glow-hover: 0 0 30px rgba(0, 212, 255, 0.5);

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

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

/* ===================================
   RESET & BASE STYLES
   =================================== */

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

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

body {
  font-family: var(--font-family-primary);
  background: var(--gradient-bg);
  background-attachment: fixed;
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ===================================
   TYPOGRAPHY
   =================================== */

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

h1 {
  font-size: var(--font-size-5xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-4xl);
  color: var(--color-text-primary);
}

h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
}

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

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

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

/* ===================================
   LAYOUT COMPONENTS
   =================================== */

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

.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  position: relative;
}

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

/* ===================================
   NAVIGATION
   =================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 14, 39, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-sm) 0;
  z-index: var(--z-nav);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 14, 39, 0.95);
  box-shadow: var(--shadow-md);
}

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

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

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

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

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

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-2xl);
  cursor: pointer;
}

/* ===================================
   HERO SECTION
   =================================== */

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

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.5;
  }

  50% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 0.8;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.profile-image-container {
  margin-bottom: var(--spacing-lg);
  position: relative;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-10px);
  }
}

.profile-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid transparent;
  background: var(--gradient-primary);
  padding: 4px;
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.4);
  transition: all var(--transition-base);
}

.profile-image:hover {
  transform: scale(1.05);
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.6);
}

.profile-initials {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-text-primary);
  background: var(--gradient-primary);
  cursor: default;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-accent-cyan);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.hero-title {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.8;
}

.hero-cta {
  display: inline-flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

/* ===================================
   BUTTONS
   =================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-glow);
}

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

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

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

/* ===================================
   CARDS
   =================================== */

.card {
  background: var(--color-surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.card:hover {
  background: var(--color-surface-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 212, 255, 0.3);
}

.card-glass {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===================================
   GRID LAYOUTS
   =================================== */

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.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
   =================================== */

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

.skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
}

.skill-name {
  font-weight: 600;
  color: var(--color-text-primary);
}

.skill-level {
  color: var(--color-accent-cyan);
  font-weight: 600;
}

.skill-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 1s ease;
  width: 0;
}

.skill-progress.animate {
  animation: fillBar 1.5s ease forwards;
}

/* ===================================
   PROJECTS
   =================================== */

.project-card {
  position: relative;
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.project-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
}

.project-title {
  font-size: var(--font-size-xl);
  margin: 0;
}

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

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

.tech-tag {
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-accent-cyan);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  border: 1px solid rgba(0, 212, 255, 0.2);
}

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

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-sm);
  color: var(--color-accent-cyan);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: rgba(0, 212, 255, 0.2);
  transform: translateX(3px);
}

/* ===================================
   CERTIFICATIONS
   =================================== */

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-sm);
}

.cert-item {
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.03);
  border-left: 3px solid var(--color-accent-cyan);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.cert-item:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(5px);
}

/* ===================================
   CONTACT SECTION
   =================================== */

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(5px);
}

.contact-icon {
  font-size: var(--font-size-2xl);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.contact-link {
  color: var(--color-accent-cyan);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
  word-break: break-all;
}

.contact-link:hover {
  color: var(--color-accent-blue);
  text-decoration: underline;
}

/* ===================================
   ANIMATIONS
   =================================== */

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

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ===================================
   SCROLL TO TOP BUTTON
   =================================== */

.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
  box-shadow: var(--shadow-glow);
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow-hover);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    flex-direction: column;
    background: rgba(10, 14, 39, 0.98);
    width: 100%;
    padding: var(--spacing-lg);
    transition: left var(--transition-base);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
    min-height: auto;
  }

  .profile-image {
    width: 150px;
    height: 150px;
  }

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

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

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

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .project-links {
    flex-wrap: wrap;
  }

  .project-link {
    flex: 1;
    min-width: 120px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-xl: 1.125rem;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

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

  .scroll-top {
    bottom: 1rem;
    right: 1rem;
    width: 45px;
    height: 45px;
  }

  .profile-image {
    width: 120px;
    height: 120px;
  }

  .hero-description {
    font-size: var(--font-size-base);
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }

  .project-link {
    font-size: 0.75rem;
    padding: 0.4rem 0.8rem;
  }
}

/* ===================================
   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);
}