/* ======================================
   Sergio Rios Portfolio - Modern Styles
   Inspired by LinkedIn + Dark Theme
====================================== */

/* === Variables === */
:root {
  /* Colors */
  --bg-dark: #0a0a0a;
  --bg-card: #111111;
  --bg-glass: rgba(30, 30, 30, 0.7);
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --text-muted: #666666;
  --accent-primary: #0077B5;
  /* LinkedIn Blue */
  --accent-secondary: #00a0dc;
  --accent-gradient: linear-gradient(135deg, #0077B5 0%, #00a0dc 100%);
  --border-color: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.05);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --section-padding: 80px 0;
  --container-max: 1200px;

  /* Effects */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  --glass-blur: blur(10px);
  --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(0, 119, 181, 0.3);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-dark);
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* === Header / Navbar === */
#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  padding: 15px 0;
  transition: all var(--transition-medium);
}

#header.scrolled {
  background: rgba(10, 10, 10, 0.95);
  box-shadow: var(--shadow-card);
}

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

#header .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

#header .logo span {
  color: var(--accent-primary);
}

.navbar ul {
  display: flex;
  gap: 30px;
}

.navbar .nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.navbar .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-medium);
}

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

.navbar .nav-link:hover::after,
.navbar .nav-link.active::after {
  width: 100%;
}

.mobile-nav-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-primary);
  cursor: pointer;
}

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

#hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.6) 100%);
  z-index: 1;
}

#hero .hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.8);
}

#hero .container {
  position: relative;
  z-index: 2;
  text-align: center;
}

#hero h1 {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 10px;
  background: linear-gradient(135deg, #fff 0%, #ccc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#hero .typed-text {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

#hero .typed-text span {
  color: var(--accent-primary);
  font-weight: 600;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-top: 30px;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: all var(--transition-medium);
}

.social-links a:hover {
  background: var(--accent-primary);
  color: var(--text-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* === Section Base === */
section {
  padding: var(--section-padding);
}

.section-dark {
  background: var(--bg-card);
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

.section-title p {
  color: var(--text-secondary);
  max-width: 700px;
  margin: 20px auto 0;
  font-size: 1.1rem;
  line-height: 1.8;
}

/* === About Section (LinkedIn Style) === */
#about .about-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 60px;
  align-items: start;
}

#about .profile-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  text-align: center;
  backdrop-filter: var(--glass-blur);
  position: sticky;
  top: 100px;
}

#about .profile-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent-primary);
  margin-bottom: 20px;
  box-shadow: var(--shadow-glow);
}

#about .profile-card h3 {
  font-size: 1.5rem;
  margin-bottom: 5px;
}

#about .profile-card .title {
  color: var(--accent-primary);
  font-weight: 500;
  margin-bottom: 15px;
}

#about .profile-card .location {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  margin-bottom: 20px;
}

#about .contact-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

#about .contact-info a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 15px;
  background: rgba(0, 119, 181, 0.1);
  border: 1px solid rgba(0, 119, 181, 0.3);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

#about .contact-info a:hover {
  background: var(--accent-primary);
  color: var(--text-primary);
}

#about .contact-info a i {
  color: var(--accent-primary);
  font-size: 1.1rem;
}

#about .contact-info a:hover i {
  color: var(--text-primary);
}

#about .about-details {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

#about .about-text {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  backdrop-filter: var(--glass-blur);
}

#about .about-text h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

#about .about-text h3 i {
  color: var(--accent-primary);
}

#about .about-text p {
  color: var(--text-secondary);
  line-height: 1.8;
}

#about .tech-stack {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  backdrop-filter: var(--glass-blur);
}

#about .tech-stack h3 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

#about .tech-stack h3 i {
  color: var(--accent-primary);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tag {
  padding: 8px 16px;
  background: rgba(0, 119, 181, 0.15);
  border: 1px solid rgba(0, 119, 181, 0.3);
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tech-tag:hover {
  background: var(--accent-primary);
  color: var(--text-primary);
  transform: translateY(-2px);
}

#about .studying {
  margin-top: 20px;
  padding: 15px 20px;
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

#about .studying strong {
  color: #ffc107;
}

/* === Stats Section === */
#stats {
  padding: 50px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

#stats .stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.stat-item {
  text-align: center;
  padding: 30px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: all var(--transition-medium);
}

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

.stat-item i {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: 15px;
}

.stat-item .count {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 5px;
}

/* === Resume Section (LinkedIn Timeline) === */
#resume .resume-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.resume-column h3 {
  font-size: 1.5rem;
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: 2px solid var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.resume-column h3 i {
  color: var(--accent-primary);
}

.timeline {
  position: relative;
  padding-left: 25px;
}

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

.timeline-item {
  position: relative;
  padding-bottom: 15px;
  padding-left: 15px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -29px;
  top: 4px;
  width: 10px;
  height: 10px;
  background: var(--accent-primary);
  border-radius: 50%;
  border: 2px solid var(--bg-dark);
}

.timeline-item:hover::before {
  box-shadow: var(--shadow-glow);
}

.timeline-item h4 {
  font-size: 0.95rem;
  margin-bottom: 2px;
  color: var(--text-primary);
  line-height: 1.3;
}

.timeline-item .date {
  font-size: 0.8rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 2px;
}

.timeline-item .company,
.timeline-item .institution {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-style: italic;
  margin-bottom: 2px;
}

.timeline-item .location {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.timeline-item ul {
  margin-top: 6px;
  padding-left: 18px;
}

.timeline-item ul li {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 3px;
  list-style: disc;
  line-height: 1.4;
}

.timeline-item.collapsed .details {
  display: none;
}

.show-more-btn {
  margin-top: 20px;
  padding: 12px 25px;
  background: transparent;
  border: 1px solid var(--accent-primary);
  color: var(--accent-primary);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.show-more-btn:hover {
  background: var(--accent-primary);
  color: var(--text-primary);
}

/* === Portfolio Section === */
#portfolio .portfolio-filters {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.portfolio-filters li {
  padding: 10px 25px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.portfolio-filters li:hover,
.portfolio-filters li.active {
  background: var(--accent-primary);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 25px;
}

.portfolio-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-medium);
}

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

.portfolio-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.portfolio-item:hover img {
  transform: scale(1.05);
}

.portfolio-info {
  padding: 20px;
}

.portfolio-info h4 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.portfolio-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 15px;
}

.portfolio-links {
  display: flex;
  gap: 10px;
}

.portfolio-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: rgba(0, 119, 181, 0.15);
  border-radius: 8px;
  color: var(--accent-primary);
  transition: all var(--transition-fast);
}

.portfolio-links a:hover {
  background: var(--accent-primary);
  color: var(--text-primary);
}

/* === Services Section === */
#services .services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 25px;
}

.service-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-medium);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

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

.service-card .icon {
  width: 70px;
  height: 70px;
  background: rgba(0, 119, 181, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.service-card .icon i {
  font-size: 2rem;
  color: var(--accent-primary);
}

.service-card h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
}

.service-card ul {
  margin-top: 15px;
}

.service-card ul li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.service-card ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* === Testimonials Section === */
#testimonials {
  background: var(--bg-card);
}

#testimonials .testimonials-container {
  max-width: 800px;
  margin: 0 auto;
}

.testimonial-item {
  text-align: center;
  padding: 40px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  margin-bottom: 30px;
}

.testimonial-item .quote {
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 25px;
  position: relative;
}

.testimonial-item .quote::before {
  content: '"';
  font-size: 4rem;
  color: var(--accent-primary);
  position: absolute;
  top: -20px;
  left: -10px;
  opacity: 0.3;
}

.testimonial-item h4 {
  font-size: 1.2rem;
  margin-bottom: 5px;
}

.testimonial-item .role {
  color: var(--accent-primary);
  font-size: 0.95rem;
}

.testimonial-item .stars {
  margin-top: 15px;
  color: #ffc107;
}

.testimonial-item .stars i {
  margin: 0 2px;
}

/* === Blog Section === */
#blog .blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 25px;
}

.blog-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-medium);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.blog-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.blog-card .content {
  padding: 25px;
}

.blog-card h4 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  line-height: 1.4;
}

.blog-card h4 a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.blog-card h4 a:hover {
  color: var(--accent-primary);
}

.blog-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 15px;
}

.blog-card .read-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-primary);
  font-weight: 500;
  font-size: 0.95rem;
}

.blog-card .read-more:hover {
  gap: 12px;
}

/* === Contact Section === */
#contact {
  background: var(--bg-card);
}

#contact .contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  max-width: 900px;
  margin: 0 auto;
}

.contact-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  text-align: center;
  transition: all var(--transition-medium);
}

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

.contact-card i {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: 15px;
}

.contact-card h4 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.contact-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.contact-card a {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 25px;
  background: var(--accent-gradient);
  color: var(--text-primary);
  border-radius: 8px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.contact-card a:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

/* === Footer === */
#footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

#footer .logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  display: inline-block;
}

#footer .logo span {
  color: var(--accent-primary);
}

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

#footer .footer-title {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 5px;
}

/* === Animations === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
  /* Fallback: si JS tarda, mostrar después de 1.5s */
  animation: fallbackShow 0.6s ease-out 1.5s forwards;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
  animation: none;
  /* Cancelar fallback si JS funcionó */
}

@keyframes fallbackShow {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Responsive === */
@media (max-width: 992px) {
  #hero h1 {
    font-size: 3rem;
  }

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

  #about .profile-card {
    position: static;
    max-width: 400px;
    margin: 0 auto 40px;
  }

  #resume .resume-grid {
    grid-template-columns: 1fr;
  }

  #stats .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar ul {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    border-bottom: 1px solid var(--border-color);
  }

  .navbar ul.active {
    display: flex;
  }

  .mobile-nav-toggle {
    display: block;
  }

  #hero h1 {
    font-size: 2.5rem;
  }

  .section-title h2 {
    font-size: 2rem;
  }

  .portfolio-grid,
  .services-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  #hero h1 {
    font-size: 2rem;
  }

  #stats .stats-grid {
    grid-template-columns: 1fr;
  }

  .timeline {
    padding-left: 20px;
  }

  .timeline-item {
    padding-left: 15px;
  }

  .timeline-item::before {
    left: -25px;
  }
}