/* ==========================================================================
   Variables & Theme Configuration (Premium Dark Mode)
   ========================================================================== */
:root {
  /* Color Palette */
  --bg-primary: #0a0a0c;
  --bg-secondary: #131418;
  --bg-tertiary: #1c1d22;
  
  --accent-primary: #3b82f6; /* Modern Blue */
  --accent-secondary: #8b5cf6; /* Vibrant Purple */
  --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(19, 20, 24, 0.7);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, Consolas, monospace;
  
  /* Shadows & Transitions */
  --shadow-sm: 0 4px 6px -1px rgba(0,0,0,0.3);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.2);
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  
  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul {
  list-style: none;
}

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

/* ==========================================================================
   Layout Base
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  border-radius: 2px;
  background: var(--accent-gradient);
}

/* ==========================================================================
   Header & Profile
   ========================================================================== */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: radial-gradient(circle at 50% 0%, var(--bg-secondary) 0%, var(--bg-primary) 70%);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--spacing-lg);
  z-index: 2;
}

.profile-img-container {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  padding: 4px;
  background: var(--accent-gradient);
  position: relative;
  box-shadow: var(--shadow-glow);
}

.profile-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--bg-primary);
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(to right, #fff, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

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

.hero-info-grid {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
  color: var(--text-secondary);
}

.info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.info-item svg {
  color: var(--accent-primary);
  width: 18px;
  height: 18px;
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.about-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.skill-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.skill-icon {
  color: var(--accent-primary);
  margin-top: 4px;
}

/* ==========================================================================
   Timeline (Experience & Education)
   ========================================================================== */
.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 15px;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  top: 6px;
  left: calc(var(--spacing-xl) * -1 + 7px);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 4px solid var(--accent-primary);
  z-index: 2;
  box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.timeline-content:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(59, 130, 246, 0.3);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.timeline-title {
  font-size: 1.25rem;
  margin-bottom: 0;
  color: var(--text-primary);
}

.timeline-subtitle {
  color: var(--accent-primary);
  font-weight: 500;
}

.timeline-date {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-family: var(--font-mono);
  background: var(--bg-tertiary);
  padding: 4px 12px;
  border-radius: 20px;
}

.timeline-location {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

.timeline-clients {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.timeline-functions-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.timeline-functions ul {
  padding-left: var(--spacing-sm);
}

.timeline-functions li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.timeline-functions li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* ==========================================================================
   Grid (Courses / Portfolio)
   ========================================================================== */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-primary);
}

.card-year {
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
}

.card-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
}

.portfolio-card .card-title {
  color: var(--text-primary);
  word-break: break-all;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  flex-grow: 1;
}

.card-meta {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px dashed var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ==========================================================================
   Languages / Additional
   ========================================================================== */
.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 20px;
  color: var(--text-secondary);
  font-weight: 500;
}

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

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

/* ==========================================================================
   Utility Layouts
   ========================================================================== */
.grid-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

@media (max-width: 639px) {
  .grid-dual {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-info-grid {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .timeline::before {
    left: 8px; /* Move line closer to edge */
  }
  
  .timeline-dot {
    left: calc(var(--spacing-xl) * -1 + 0px);
  }
  
  .timeline-header {
    flex-direction: column;
  }
  
  .timeline-date {
    margin-top: var(--spacing-sm);
    display: inline-block;
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
}

@media (max-width: 425px) {
  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  h1, h2, h3, h4, .timeline-title, .card-title {
    overflow-wrap: break-word;
    word-break: break-word; /* Ensure long words like Telecomunicaciones don't overflow */
  }

  .timeline {
    padding-left: var(--spacing-lg);
  }

  .timeline-dot {
    left: calc(var(--spacing-lg) * -1 + 0px);
  }
}