/* Modern Portfolio - Clean Design System */

:root {
  /* Colors */
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-surface-light: #1a1a1a;
  --color-border: #2a2a2a;
  --color-primary: #3b82f6;
  --color-primary-light: #60a5fa;
  --color-accent: #10b981;
  --color-text: #ffffff;
  --color-text-muted: #a1a1aa;
  --color-text-light: #d4d4d8;
  
  /* Typography */
  --font-family: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 20px rgb(59 130 246 / 0.3);
  
  /* Border radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Background pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 1px 1px, rgba(59, 130, 246, 0.15) 1px, transparent 0);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: -1;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__menu {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav__link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  gap: 4px;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s ease;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-3xl) 0;
  position: relative;
}

.hero__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero__title-main {
  display: block;
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__title-sub {
  display: block;
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 600;
  color: var(--color-primary-light);
  font-family: var(--font-mono);
  margin-bottom: var(--space-lg);
}

.hero__description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 500px;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Hero Visual */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__code {
  width: 100%;
  max-width: 400px;
}

.code-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background: var(--color-surface-light);
  border-bottom: 1px solid var(--color-border);
}

.code-dots {
  display: flex;
  gap: var(--space-xs);
}

.code-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
}

.code-dots span:nth-child(1) { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #ffbd2e; }
.code-dots span:nth-child(3) { background: #28ca42; }

.code-title {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.code-content {
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}

.code-line {
  margin-bottom: 0.5rem;
}

.code-line--indent { padding-left: 1rem; }
.code-line--indent2 { padding-left: 2rem; }

.code-comment { color: #6b7280; }
.code-keyword { color: #f59e0b; }
.code-class { color: #3b82f6; }
.code-property { color: #10b981; }
.code-string { color: #ec4899; }
.code-bracket { color: var(--color-text); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
}

.btn--full {
  width: 100%;
}

/* Section Styles */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--color-text), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* About Section */
.about {
  padding: var(--space-3xl) 0;
  background: var(--color-surface);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about__text {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
  line-height: 1.7;
}

.about__highlights {
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.highlight-item:hover {
  border-color: var(--color-primary);
  transform: translateX(8px);
}

.highlight-item__icon {
  font-size: 1.5rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.highlight-item__content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.highlight-item__content p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Skills */
.about__skills {
  background: var(--color-bg);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

.skills-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  text-align: center;
  color: var(--color-text);
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.skill-category__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-primary-light);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.skill-tag {
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.skill-tag--expert {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.skill-tag--advanced {
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-primary-light);
  border-color: var(--color-primary);
}

.skill-tag--intermediate {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
  border-color: #f59e0b;
}

.skill-tag:hover {
  transform: scale(1.05);
}

/* Experience Section */
.experience {
  padding: var(--space-3xl) 0;
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-2xl);
  padding-left: var(--space-3xl);
}

.timeline-marker {
  position: absolute;
  left: 12px;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  border: 4px solid var(--color-bg);
  border-radius: 50%;
  z-index: 1;
}

.timeline-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all 0.3s ease;
}

.timeline-content:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.timeline-header {
  margin-bottom: var(--space-md);
}

.timeline-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.timeline-company {
  color: var(--color-primary-light);
  font-weight: 600;
  margin-right: var(--space-md);
}

.timeline-period {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.timeline-description {
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.timeline-skill {
  padding: var(--space-xs) var(--space-sm);
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-primary-light);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

/* Contact Section */
.contact {
  padding: var(--space-3xl) 0;
  background: var(--color-surface);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  max-width: 1000px;
  margin: 0 auto;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all 0.3s ease;
}

.contact-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.contact-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.contact-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.contact-card__link {
  color: var(--color-primary-light);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.contact-card__link:hover {
  color: var(--color-primary);
}

.contact-card__text {
  color: var(--color-text-muted);
}

/* Form */
.contact__form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-lg);
}

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

.form-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  transition: all 0.3s ease;
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

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

/* Footer */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__text {
  color: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav__menu {
    display: none;
  }
  
  .nav__toggle {
    display: flex;
  }
  
  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }
  
  .about__grid,
  .contact__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .hero__actions {
    justify-content: center;
  }
  
  .timeline::before {
    left: 15px;
  }
  
  .timeline-item {
    padding-left: var(--space-xl);
  }
  
  .timeline-marker {
    left: 7px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .nav__container {
    padding: 0 var(--space-md);
  }
  
  .hero {
    padding: var(--space-xl) 0;
  }
  
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    text-align: center;
  }
}