/* ============================================
   CSS DESIGN SYSTEM - Portfolio
   ============================================ */

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

:root {
  /* Colors */
  --bg-primary: #06060f;
  --bg-secondary: #0c0c1d;
  --bg-card: #111128;
  --bg-card-hover: #16163a;
  --bg-elevated: #1a1a40;
  --border-color: rgba(139, 92, 246, 0.15);
  --border-hover: rgba(139, 92, 246, 0.35);

  --text-primary: #f1f0ff;
  --text-secondary: #a5a3c7;
  --text-muted: #6b6894;

  --accent-1: #8b5cf6;    /* Violet */
  --accent-2: #06b6d4;    /* Cyan */
  --accent-3: #a855f7;    /* Purple */
  --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  --accent-glow: 0 0 20px rgba(139, 92, 246, 0.3);

  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 70px;
}

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

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

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition-base);
  backdrop-filter: blur(0px);
}

.navbar.scrolled {
  background: rgba(6, 6, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

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

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
  transition: var(--transition-base);
}

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

.nav-link:hover::after, .nav-link.active::after {
  width: 60%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

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

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

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
  animation: float 8s ease-in-out infinite;
}

.hero-orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.4), transparent 70%);
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.hero-orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.3), transparent 70%);
  bottom: -50px;
  left: -100px;
  animation-delay: -3s;
}

.hero-orb-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.3), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -5s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3xl);
  max-width: var(--max-width);
  width: 100%;
  padding: 0 var(--space-xl);
}

.hero-text {
  flex: 1;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--accent-1);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  opacity: 0;
  animation: slideUp 0.6s ease forwards 0.2s;
}

.hero-name {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: slideUp 0.6s ease forwards 0.4s;
}

.hero-title {
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: slideUp 0.6s ease forwards 0.6s;
}

.hero-bio {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 500px;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: slideUp 0.6s ease forwards 0.8s;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  opacity: 0;
  animation: slideUp 0.6s ease forwards 1s;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition-base);
  white-space: nowrap;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(139, 92, 246, 0.5);
}

.btn-outline {
  border: 1.5px solid var(--border-hover);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: rgba(139, 92, 246, 0.1);
  border-color: var(--accent-1);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--text-secondary);
}

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

/* Avatar */
.hero-avatar-wrapper {
  position: relative;
  flex-shrink: 0;
  opacity: 0;
  animation: slideUp 0.8s ease forwards 0.5s;
}

.hero-avatar {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid transparent;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.avatar-ring {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: var(--accent-gradient);
  z-index: 0;
  animation: spin 6s linear infinite;
  opacity: 0.6;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.avatar-ring::before {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--bg-primary);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  opacity: 0.5;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--space-3xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
  max-width: 300px;
}

.title-accent {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--accent-1);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.about-text p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.about-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.info-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
}

.info-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.info-item svg {
  color: var(--accent-1);
  flex-shrink: 0;
}

.info-item .info-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-item .info-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.skills-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-badge {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-base);
  cursor: default;
}

.skill-badge:hover {
  border-color: var(--accent-1);
  color: var(--accent-1);
  box-shadow: 0 0 15px rgba(139, 92, 246, 0.2);
  transform: translateY(-2px);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-filter {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

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

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), var(--accent-glow);
}

.project-image {
  position: relative;
  height: 200px;
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-card));
  overflow: hidden;
}

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

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

.project-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(6, 182, 212, 0.1));
}

.project-image-placeholder svg {
  color: var(--text-muted);
  opacity: 0.5;
}

.project-featured-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 12px;
  background: var(--accent-gradient);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--radius-full);
}

.project-category-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  background: rgba(6, 6, 15, 0.7);
  backdrop-filter: blur(10px);
  color: var(--accent-2);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.project-body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.project-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-lg);
}

.tech-tag {
  padding: 4px 10px;
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent-1);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(139, 92, 246, 0.15);
}

.project-links {
  display: flex;
  gap: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.project-link-live {
  background: var(--accent-gradient);
  color: white;
}

.project-link-live:hover {
  box-shadow: var(--accent-glow);
  transform: translateY(-1px);
}

.project-link-github {
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.project-link-github:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-content {
  text-align: center;
}

.contact-text {
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

.contact-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

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

.contact-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--accent-glow);
}

.contact-card svg {
  color: var(--accent-1);
  margin-bottom: var(--space-md);
}

.contact-card h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.contact-card p {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 500;
}

.contact-card a {
  color: var(--accent-2);
  text-decoration: none;
  transition: var(--transition-fast);
}

.contact-card a:hover {
  color: var(--accent-1);
}

.contact-socials {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

.social-link {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

.social-link:hover {
  border-color: var(--accent-1);
  color: var(--accent-1);
  transform: translateY(-3px);
  box-shadow: var(--accent-glow);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.footer p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer .heart {
  color: #ef4444;
  animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

.footer-year {
  margin-top: var(--space-sm);
  font-size: 0.8rem;
}

/* ============================================
   SCROLL REVEAL ANIMATION
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(6, 6, 15, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-xl);
    gap: var(--space-sm);
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
    padding-top: var(--space-xl);
  }

  .hero-bio {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-avatar {
    width: 180px;
    height: 180px;
  }

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

  .about-info {
    grid-template-columns: 1fr;
  }

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

  .section-title {
    font-size: 1.5rem;
  }

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

@media (max-width: 480px) {
  :root {
    --space-xl: 1.25rem;
  }

  .hero-name {
    font-size: 2rem;
  }

  .hero-title {
    font-size: 1.1rem;
  }

  .btn {
    padding: 10px 18px;
    font-size: 0.85rem;
  }
}

/* ============================================
   LOADING STATE
   ============================================ */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}