/* ============================================
   JAE'S PORTFOLIO - DESIGN SYSTEM
   Futuristic IT Startup Style
   ============================================ */

/* CSS Variables */
:root {
  /* Colors */
  --bg-primary: #0a0a1a;
  --bg-secondary: #0f0f2a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.05);
  
  /* Gradient Colors */
  --gradient-start: #a855f7;
  --gradient-mid: #8b5cf6;
  --gradient-end: #06b6d4;
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  
  /* Glow Effects */
  --glow-purple: rgba(168, 85, 247, 0.4);
  --glow-cyan: rgba(6, 182, 212, 0.4);
  --glow-intense: rgba(168, 85, 247, 0.6);
  
  /* Border Colors */
  --border-subtle: rgba(255, 255, 255, 0.1);
  --border-gradient: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  
  /* Spacing */
  --section-padding: 120px;
  --container-max: 1200px;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

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

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

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

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(168, 85, 247, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Section */
section {
  padding: var(--section-padding) 0;
  position: relative;
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition-medium);
}

.navbar.scrolled {
  background: rgba(10, 10, 26, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  padding: 10px 20px;
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.nav-links a.active {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(6, 182, 212, 0.2));
  border: 1px solid var(--border-subtle);
}

/* Mobile Menu Button */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

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

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  margin-bottom: 8px;
}

.hero-text .tagline {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-weight: 500;
}

.hero-text .description {
  font-size: 1.125rem;
  max-width: 500px;
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Profile Image Container */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.profile-container {
  position: relative;
  width: 300px;
  height: 300px;
}

.profile-ring {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  opacity: 0.3;
  animation: pulse 3s ease-in-out infinite;
}

.profile-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg-card);
  border: 3px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}

.profile-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(6, 182, 212, 0.1));
}

/* Floating 3D Shapes */
.floating-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.3), rgba(6, 182, 212, 0.2));
  top: 10%;
  right: 15%;
  animation-delay: 0s;
  transform: rotate(15deg);
}

.shape-2 {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.3), rgba(168, 85, 247, 0.2));
  bottom: 20%;
  right: 5%;
  animation-delay: 1s;
  border-radius: 50%;
}

.shape-3 {
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.15));
  top: 30%;
  right: -5%;
  animation-delay: 2s;
  transform: rotate(-10deg);
}

.shape-4 {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.25), transparent);
  bottom: 35%;
  left: -10%;
  animation-delay: 1.5s;
  border-radius: 50%;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(var(--rotation, 0deg)); }
  50% { transform: translateY(-20px) rotate(calc(var(--rotation, 0deg) + 5deg)); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.05); }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-medium);
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  box-shadow: 0 4px 20px var(--glow-purple);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--glow-intense);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.125rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  color: var(--gradient-start);
  font-weight: 500;
  margin-bottom: 20px;
  border: 1px solid rgba(168, 85, 247, 0.2);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
  background: var(--bg-secondary);
  position: relative;
}

.about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text h3 {
  margin-bottom: 24px;
  font-size: 1.75rem;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 1.0625rem;
  line-height: 1.8;
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition-medium);
}

.info-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.info-card h4 {
  color: var(--gradient-start);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.info-card h4 .icon {
  font-size: 1.25rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  padding: 8px 14px;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(168, 85, 247, 0.2);
  color: var(--text-primary);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition-medium);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
  border-color: rgba(168, 85, 247, 0.3);
}

.project-image {
  height: 220px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  position: relative;
  overflow: hidden;
}

.project-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(6, 182, 212, 0.1));
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-medium);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-content {
  padding: 28px;
}

.project-content h3 {
  margin-bottom: 12px;
  font-size: 1.375rem;
}

.project-content p {
  margin-bottom: 20px;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tag {
  padding: 6px 12px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--gradient-end);
}

/* ============================================
   BLOG SECTION
   ============================================ */
.blog {
  background: var(--bg-secondary);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition-medium);
  cursor: pointer;
}

.blog-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  border-color: rgba(6, 182, 212, 0.3);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

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

.blog-category {
  padding: 4px 10px;
  background: rgba(168, 85, 247, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--gradient-start);
  font-weight: 500;
}

.blog-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  transition: var(--transition-fast);
}

.blog-card:hover h3 {
  color: var(--gradient-end);
}

.blog-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.blog-card .read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--gradient-end);
  font-size: 0.9375rem;
  font-weight: 500;
}

.blog-card .read-more::after {
  content: '→';
  transition: var(--transition-fast);
}

.blog-card:hover .read-more::after {
  transform: translateX(4px);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: 60px 0;
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  color: var(--text-secondary);
  font-size: 1.125rem;
  transition: var(--transition-fast);
}

.social-link:hover {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  border-color: transparent;
  transform: translateY(-2px);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.5s; }

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 50px;
  }
  
  .hero-text .description {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .profile-container {
    width: 250px;
    height: 250px;
  }
  
  .floating-shapes {
    display: none;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 50px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
  }
  
  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 8px;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-links a {
    padding: 16px 20px;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .projects-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .profile-container {
    width: 200px;
    height: 200px;
  }
}