:root {
  /* Colors - Dark mode (default) */
  --color-primary: #0084D1;
  --color-primary-dark: #005A8E;
  --color-primary-light: #33a0de;
  --color-bg: #0F1117;
  --color-surface: #1A1D27;
  --color-surface-2: #252836;
  --color-text: #E8EAF0;
  --color-text-muted: #8B92A5;
  --color-accent: #00D4FF;
  --color-success: #00C896;
  --color-border: rgba(255,255,255,0.07);
  --color-glass: rgba(255,255,255,0.04);
  --color-glass-border: rgba(255,255,255,0.08);

  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
  --fs-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
  --fs-md: clamp(1rem, 0.9rem + 0.5vw, 1.15rem);
  --fs-lg: clamp(1.15rem, 1rem + 0.75vw, 1.4rem);
  --fs-xl: clamp(1.4rem, 1.1rem + 1.5vw, 2rem);
  --fs-2xl: clamp(1.8rem, 1.3rem + 2.5vw, 2.8rem);
  --fs-3xl: clamp(2.2rem, 1.5rem + 3.5vw, 3.5rem);

  /* Layout */
  --sidebar-width: 35%;
  --main-width: 65%;
  --container-max: 1200px;
  --header-height: 4rem;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(0,132,209,0.3);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* Semantic color tokens (ISO 9241) */
:root {
  --color-error: #FF4D6A;
  --color-warning: #FFB020;

  /* Font weight tokens */
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* Breakpoint tokens */
  --bp-sm: 600px;
  --bp-md: 768px;
  --bp-lg: 1024px;
}

/* Deteccion automatica de tema OS (ISO 9241-210) */
@media (prefers-color-scheme: light) {
  :root:not(.dark-mode-forced) {
    --color-bg: #F8F9FC;
    --color-surface: #FFFFFF;
    --color-surface-2: #F0F1F5;
    --color-text: #1A1D27;
    --color-text-muted: #5A6178;
    --color-border: rgba(0,0,0,0.08);
    --color-glass: rgba(0,0,0,0.02);
    --color-glass-border: rgba(0,0,0,0.06);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  }
}

/* High contrast support (WCAG 2.1 AAA / ISO 40500) */
@media (prefers-contrast: more) {
  :root {
    --color-text: #FFFFFF;
    --color-text-muted: #D0D4E0;
    --color-border: rgba(255,255,255,0.2);
  }
}

@media (forced-colors: active) {
  :root {
    --color-primary: LinkText;
    --color-text: CanvasText;
    --color-bg: Canvas;
  }
}

/* Reset basico y box-sizing */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

ul[role="list"], ol[role="list"], ul, ol {
  list-style: none;
}

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

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

/* Remover animaciones si el usuario lo prefiere */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--color-text);
  line-height: 1.6;
}

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

h1 { font-size: var(--fs-3xl); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-2xl); letter-spacing: -0.01em; }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }
h5 { font-size: var(--fs-md); }
h6 { font-size: var(--fs-base); }

p {
  margin-bottom: var(--space-md);
}

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

a:hover, a:focus {
  color: var(--color-primary-light);
}

strong, b {
  font-weight: 600;
  color: var(--color-text);
}

em, i {
  font-style: italic;
  color: var(--color-accent);
}

/* Utilidades Tipograficas */
.text-muted {
  color: var(--color-text-muted);
}

.text-accent {
  color: var(--color-accent);
}

.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.fs-xs { font-size: var(--fs-xs); }
.fs-sm { font-size: var(--fs-sm); }
.fs-base { font-size: var(--fs-base); }
.fs-md { font-size: var(--fs-md); }
.fs-lg { font-size: var(--fs-lg); }
.fs-xl { font-size: var(--fs-xl); }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-glass-border);
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
}

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.site-header__logo {
  font-weight: 700;
  font-size: var(--fs-xl);
  color: var(--color-text);
  letter-spacing: -0.05em;
  z-index: var(--z-sticky);
}

.site-header__logo-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav__link:hover, .nav__link:focus, .nav__link--active {
  color: var(--color-text);
}

.nav__link:hover::after, .nav__link:focus::after, .nav__link--active::after {
  width: 100%;
}

.nav__hamburger {
  display: none;
  z-index: var(--z-sticky);
  color: var(--color-text);
}

/* Main Content */
.site-main {
  padding-top: var(--header-height);
  min-height: 100vh;
}

/* Sections */
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section__title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  font-size: var(--fs-2xl);
  position: relative;
  padding-left: var(--space-md);
}

.section__title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10%;
  height: 80%;
  width: 4px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
}

.section__title .icon {
  color: var(--color-primary);
  font-size: 1.2em;
}

.section__subtitle {
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
  font-size: var(--fs-md);
}

/* Grid Layout (Desktop: Sidebar + Main) */
.grid-layout {
  display: grid;
  gap: var(--space-2xl);
}

@media (min-width: 1024px) {
  .grid-layout {
    grid-template-columns: var(--sidebar-width) 1fr;
  }
}

/* Skip Link para Accesibilidad */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  z-index: var(--z-toast);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--fs-base);
  transition: all var(--transition-base);
  text-align: center;
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn--sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--fs-sm);
  border-radius: var(--radius-sm);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #FFFFFF;
  border: none;
  box-shadow: var(--shadow-md);
}

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

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-text-muted);
}

.btn--disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-glass-border);
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-xl);
  font-size: var(--fs-xs);
  font-weight: 600;
  background-color: var(--color-surface-2);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.badge--available {
  background-color: rgba(0, 200, 150, 0.1);
  color: var(--color-success);
  border-color: rgba(0, 200, 150, 0.2);
}

.badge__dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-success);
  border-radius: var(--radius-full);
  display: inline-block;
  animation: pulse 2s infinite;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--color-surface-2);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: 500;
}

/* Icons */
.icon {
  display: inline-block;
  line-height: 1;
  vertical-align: middle;
}

.icon--sm {
  font-size: 1.2rem;
}

.icon--lg {
  font-size: 2rem;
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal--active {
  opacity: 1;
  pointer-events: auto;
}

.modal__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
}

.modal__content {
  position: relative;
  width: 90%;
  max-width: 500px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-base);
}

.modal--active .modal__content {
  transform: translateY(0);
}

/* Contact Reveal Button */
.contact-reveal {
  position: relative;
  overflow: hidden;
}

.contact-reveal--compact {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--fs-sm);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: 44px;
  transition: all var(--transition-fast);
}

.contact-reveal--compact:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.contact-reveal--whatsapp {
  color: #25D366; /* WhatsApp brand color */
}

.contact-reveal--whatsapp:hover {
  background-color: #25D366;
  border-color: #25D366;
  color: white;
}

/* Divider */
.divider {
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: var(--space-xl) 0;
  border: none;
}

/* WhatsApp Float - ISO 9241-210 UX standards */
.wa-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--z-toast);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.wa-btn__pulse {
  position: absolute;
  right: 0;
  top: 0;
  width: 56px;
  height: 56px;
  background-color: #25D366;
  border-radius: 50%;
  animation: waPulse 2s infinite;
  pointer-events: none;
}

.wa-btn__pill {
  position: relative;
  display: flex;
  flex-direction: row-reverse;
  align-items: center;
  height: 56px;
  background-color: #25D366;
  color: #FFF;
  border-radius: 28px;
  padding: 0 14px;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.4);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  overflow: hidden;
  white-space: nowrap;
}

.wa-btn:hover .wa-btn__pill {
  background-color: #20BA56;
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.6);
  padding-left: 20px;
}

.wa-btn__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.wa-btn:hover .wa-btn__icon {
  transform: scale(1.1) rotate(10deg);
}

.wa-btn__text {
  font-weight: 600;
  font-size: 15px;
  max-width: 0;
  opacity: 0;
  margin-right: 0;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.wa-btn:hover .wa-btn__text {
  max-width: 150px;
  opacity: 1;
  margin-right: 10px;
}

@keyframes waPulse {
  0% {
    transform: scale(1);
    opacity: 0.8;
  }
  100% {
    transform: scale(1.8);
    opacity: 0;
  }
}

@media (min-width: 768px) {
  .wa-btn {
    bottom: 32px;
    right: 32px;
  }
}

/* Hero Section */
.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-4xl) 0;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(0, 132, 209, 0.08) 0%, transparent 50%);
  z-index: 0;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-md);
}

.hero__photo-wrapper {
  position: relative;
  margin-bottom: var(--space-lg);
}

.hero__photo-border {
  width: 168px;
  height: 168px;
  border-radius: var(--radius-full);
  padding: 4px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  animation: gradientBorder 4s linear infinite;
  box-shadow: var(--shadow-glow);
}

.hero__photo {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-full);
  object-fit: cover;
  background-color: var(--color-surface);
  border: 4px solid var(--color-bg);
}

.hero__badge {
  position: absolute;
  bottom: 0;
  right: -10px;
  z-index: 2;
  box-shadow: var(--shadow-sm);
  background-color: var(--color-surface);
}

.hero__name {
  margin-bottom: 0;
}

.hero__headline {
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
  min-height: 3rem;
  max-width: 600px;
}

.hero__cursor {
  font-weight: 700;
  color: var(--color-accent);
  animation: blink 1s step-end infinite;
}

.hero__location {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin-bottom: var(--space-lg);
}

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

/* Timeline (Experiencia) */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline__line {
  position: absolute;
  top: 0;
  left: 5px;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent), transparent);
  border-radius: var(--radius-full);
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-xl);
}

.timeline__item:last-child {
  margin-bottom: 0;
}

.timeline__dot {
  position: absolute;
  top: 24px;
  left: calc(var(--space-xl) * -1 + 1px);
  width: 10px;
  height: 10px;
  background-color: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-full);
  z-index: 2;
  transition: transform var(--transition-base), background-color var(--transition-base);
}

.timeline__item:hover .timeline__dot {
  transform: scale(1.5);
  background-color: var(--color-primary);
}

.timeline__card {
  padding: var(--space-lg);
}

.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.timeline__company {
  font-size: var(--fs-md);
  margin-bottom: 2px;
  color: var(--color-text);
}

.timeline__position {
  font-size: var(--fs-base);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0;
}

.timeline__period {
  font-size: var(--fs-xs);
  white-space: nowrap;
}

.timeline__location {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.timeline__link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  margin-left: 8px;
}

.timeline__link:hover {
  color: var(--color-primary);
}

/* Accordion para roles */
.timeline__roles {
  margin-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
}

.timeline__toggle {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.timeline__toggle:hover {
  color: var(--color-primary);
}

.timeline__toggle .icon {
  transition: transform var(--transition-base);
}

.timeline__toggle[aria-expanded="true"] .icon {
  transform: rotate(180deg);
}

.timeline__roles-content {
  margin-top: var(--space-md);
  padding-left: var(--space-md);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.timeline__roles-content[hidden] {
  display: none;
}

.timeline__role-title {
  font-size: var(--fs-sm);
  color: var(--color-text);
  margin-bottom: 4px;
}

.timeline__role-period {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  display: inline-block;
  margin-bottom: var(--space-sm);
  background-color: var(--color-surface-2);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.timeline__description {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.timeline__description ul {
  list-style: disc;
  padding-left: var(--space-md);
  margin-bottom: 0;
}

.timeline__description li {
  margin-bottom: var(--space-xs);
}

.timeline__description li:last-child {
  margin-bottom: 0;
}

/* Grid de habilidades */
.skills-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.skills-category {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.skills-category__title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-lg);
  color: var(--color-text);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-sm);
}

.skills-category__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.skill-item__name {
  font-size: var(--fs-sm);
  font-weight: 500;
  display: flex;
  justify-content: space-between;
}

.skill-item__bar {
  height: 6px;
  background-color: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-item__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  /* El ancho se anima mediante JS */
}

/* Grid de Educacion */
.education-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .education-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

.education-card {
  display: flex;
  gap: var(--space-md);
  position: relative;
  overflow: hidden;
}

.education-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-primary);
}

.education-card__icon {
  display: flex;
  align-items: flex-start;
  color: var(--color-primary);
  padding-top: var(--space-xs);
}

.education-card__icon .material-symbols-outlined {
  font-size: 2rem;
}

.education-card__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.education-card__school {
  font-size: var(--fs-md);
  margin-bottom: 0;
}

.education-card__degree {
  color: var(--color-accent);
  font-weight: 500;
  font-size: var(--fs-sm);
  margin-bottom: 0;
}

.education-card__area {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin-bottom: 0;
}

.education-card__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  margin-top: var(--space-xs);
  margin-bottom: 0;
}

.education-card__meta .icon {
  margin-right: 4px;
}

.education-card__link {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.education-card__link:hover {
  color: var(--color-primary);
}

/* Grid de Certificados */
.certs-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .certs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .certs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.cert-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  position: relative;
  text-align: center;
  align-items: center;
  padding: var(--space-xl) var(--space-lg);
}

.cert-card__icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.cert-card__title {
  font-size: var(--fs-sm);
  margin-bottom: 0;
}

.cert-card__issuer {
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  margin-bottom: 0;
}

.cert-card__date {
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  background-color: var(--color-surface-2);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-top: var(--space-xs);
}

.cert-card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-accent);
  font-size: var(--fs-xs);
  margin-top: var(--space-sm);
  transition: color var(--transition-fast);
}

.cert-card__link:hover {
  color: var(--color-primary-light);
}

/* Grid de Referencias */
.references-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .references-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.reference-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.reference-card__name {
  font-size: var(--fs-md);
  margin-bottom: 0;
}

.reference-card__position {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin-bottom: var(--space-sm);
}

.reference-card__contact {
  display: flex;
  gap: var(--space-sm);
  margin-top: auto;
}

/* Grid de Proyectos */
.projects-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  height: 100%;
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-sm);
}

.project-card__name {
  font-size: var(--fs-md);
  margin-bottom: 0;
}

.project-card__period {
  font-size: var(--fs-xs);
  flex-shrink: 0;
}

.project-card__description {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  flex-grow: 1;
  margin-bottom: 0;
}

.project-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

/* Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-4xl);
}

.footer__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

@media (min-width: 768px) {
  .footer__content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copyright {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: 0;
}

.footer__link {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--transition-fast);
  padding: 12px;
  margin: -12px;
}

.footer__social-link {
  display: inline-flex;
  padding: 12px;
  margin: -12px;
}

.footer__link:hover {
  color: var(--color-primary);
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-toast);
  background-color: var(--color-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-glass-border);
  padding: var(--space-lg);
  transform: translateY(0);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 -10px 30px rgba(0,0,0,0.2);
}

.cookie-banner--hidden {
  transform: translateY(120%);
}

.cookie-banner__content {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .cookie-banner__content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.cookie-banner__text {
  font-size: var(--fs-sm);
  margin-bottom: 0;
  color: var(--color-text);
  flex: 1;
}

.cookie-banner__link {
  color: #FFFFFF;
  text-decoration: underline;
  font-weight: 700;
}

.cookie-banner__actions {
  display: flex;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* Animaciones y utilidades de animacion */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 200, 150, 0.4); }
  70% { box-shadow: 0 0 0 6px rgba(0, 200, 150, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 200, 150, 0); }
}

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

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Clases de animacion al hacer scroll (con IntersectionObserver) */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: opacity, transform;
}

.animate-on-scroll--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays para listas */
.animate-on-scroll:nth-child(1) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.5s; }

body.light-mode {
  --color-bg: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-surface-2: #E8EBF0;
  --color-text: #1A1D27;
  --color-text-muted: #5A6275;
  --color-border: rgba(0,0,0,0.08);
  --color-glass: rgba(255,255,255,0.7);
  --color-glass-border: rgba(0,0,0,0.08);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 20px rgba(0,132,209,0.15);
}

body.light-mode .hero::before {
  background: radial-gradient(circle at center, rgba(0, 132, 209, 0.05) 0%, transparent 60%);
}

body.light-mode .timeline__dot {
  background-color: var(--color-surface);
}

body.light-mode .contact-reveal--compact {
  background-color: var(--color-surface);
}

body.light-mode .contact-reveal--compact:hover {
  background-color: var(--color-primary);
  color: white;
}

@media (max-width: 767px) {
  .site-header__inner {
    position: relative;
  }
  
  .nav__hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-text);
    padding: 8px;
    min-height: 44px;
    min-width: 44px;
    cursor: pointer;
  }
  
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
    display: none;
    flex-direction: column;
    box-shadow: var(--shadow-md);
  }
  
  .site-nav.nav--mobile-open {
    display: flex;
  }
  
  .nav__list {
    flex-direction: column;
    width: 100%;
    align-items: flex-start;
  }
  
  .nav__link {
    display: block;
    width: 100%;
    padding: var(--space-sm) 0;
    min-height: 44px;
    line-height: 28px;
  }
  
  .hero__content {
    padding-top: var(--space-2xl);
  }
  
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero__actions .btn {
    width: 100%;
  }
  
  .timeline__header {
    flex-direction: column;
    align-items: flex-start;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.contact-trap {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

[hidden] {
  display: none !important;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-center { align-items: center; justify-content: center; }
.flex-between { justify-content: space-between; }

.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

@media print {
  *, *::before, *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
    animation: none !important;
    transition: none !important;
  }

  body {
    font-size: 11pt;
    line-height: 1.4;
    background: #fff;
  }

  .site-header,
  .site-footer,
  .cookie-banner,
  .skip-link,
  .btn,
  .theme-toggle,
  .timeline__toggle,
  .contact-trap {
    display: none !important;
  }

  .site-main {
    padding-top: 0;
  }

  .section {
    padding: 1cm 0;
    page-break-inside: avoid;
  }

  .hero {
    min-height: auto;
    padding: 0 0 1cm 0;
    page-break-after: avoid;
  }

  .hero__photo-border {
    border: none;
    padding: 0;
  }

  .card {
    border: 1px solid #ccc;
    padding: 0.5cm;
    page-break-inside: avoid;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
  }

  a[href^="javascript:"]::after,
  a[href^="#"]::after {
    content: "";
  }

  .contact-reveal__partial {
    display: none !important;
  }

  .contact-reveal__label {
    display: inline !important;
    font-weight: bold;
  }

  .timeline__line {
    background: #ccc;
  }

  .timeline__dot {
    border-color: #666;
  }

  .timeline__roles-content {
    display: block !important;
  }
}