/* ===== MELHORIAS DE UI/UX PARA PORTFÓLIO ===== */

/* === 1. GRADIENTE ANIMADO NO HEADER === */
.hero-gradient-bg {
  background: linear-gradient(-45deg, #1a1a1a, #2d2d2d, #3d3d3d, #1a1a1a);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* === 2. BARRAS DE PROGRESSO PARA SKILLS === */
.skill-progress-container {
  margin-top: 8px;
}

.skill-progress {
  width: 100%;
  height: 8px;
  background: #2d2d2d;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.skill-progress-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 1.5s ease;
  position: relative;
}

.skill-progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Cores por categoria de skill */
.skill-progress-bar.backend { background: linear-gradient(90deg, #4CAF50, #8BC34A); }
.skill-progress-bar.frontend { background: linear-gradient(90deg, #2196F3, #03A9F4); }
.skill-progress-bar.data { background: linear-gradient(90deg, #FF9800, #FFC107); }
.skill-progress-bar.ai { background: linear-gradient(90deg, #9C27B0, #E91E63); }

/* === 3. CARDS COM HOVER EFFECTS === */
.portfolio-card {
  background: var(--mid-gray);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  border: 1px solid var(--light-gray);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.portfolio-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.portfolio-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
  border-color: var(--primary);
}

.portfolio-card:hover::before {
  transform: scaleX(1);
}

/* === 4. BOTÕES CTA === */
.cta-buttons {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.cta-btn {
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 2px solid transparent;
}

.cta-btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

.cta-btn.secondary {
  background: transparent;
  color: var(--text-light);
  border-color: var(--text-light);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.cta-btn.primary:hover {
  background: linear-gradient(135deg, var(--secondary), var(--primary));
}

.cta-btn.secondary:hover {
  background: var(--text-light);
  color: var(--dark-gray);
}

/* === 5. ANIMAÇÕES DE ENTRADA === */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all 0.6s ease;
}

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

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all 0.6s ease;
}

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

/* === 6. BACK TO TOP BUTTON === */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.4);
}

/* === 7. TIMELINE MELHORADA === */
.timeline-item {
  position: relative;
  padding-left: 30px;
  margin-bottom: 30px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  border: 3px solid var(--dark-gray);
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 15px;
  width: 2px;
  height: calc(100% + 15px);
  background: var(--light-gray);
}

.timeline-item:last-child::after {
  display: none;
}

/* === 8. TOOLTIPS PARA SKILLS === */
.skill-tooltip {
  position: relative;
  cursor: help;
}

.skill-tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--dark-gray);
  color: var(--text-light);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  border: 1px solid var(--light-gray);
}

.skill-tooltip::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--dark-gray);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.skill-tooltip:hover::after,
.skill-tooltip:hover::before {
  opacity: 1;
  visibility: visible;
}

/* === 9. LOADING SKELETON === */
.skeleton {
  background: linear-gradient(90deg, #2d2d2d 25%, #3d3d3d 50%, #2d2d2d 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

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

/* === 10. RESPONSIVE IMPROVEMENTS === */
@media (max-width: 768px) {
  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .cta-btn {
    text-align: center;
    justify-content: center;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 18px;
  }
  
  .portfolio-card {
    padding: 20px;
    margin-bottom: 16px;
  }
}

@media (max-width: 480px) {
  .portfolio-card {
    padding: 16px;
    border-radius: 8px;
  }
  
  .cta-btn {
    padding: 10px 20px;
    font-size: 14px;
  }
}

/* === 11. MELHORIAS DE ACESSIBILIDADE === */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states para navegação por teclado */
.cta-btn:focus,
.back-to-top:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* === 12. VARIÁVEIS DE CORES MELHORADAS === */
:root {
  /* Cores principais */
  --primary: #6366f1;
  --secondary: #8b5cf6;
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  /* Tons de cinza melhorados */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Backgrounds */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  
  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}