/* =============================================================================
   PICO Y PLACA SOLIDARIO - MVP EDUCATIVO
   Sistema de Diseño Liviano con CSS Variables y BEM
   ============================================================================= */

/* Variables CSS */
:root {
  /* Colores principales - Paleta verde ambiental */
  --color-primary: #059669;      /* Verde bosque */
  --color-primary-dark: #047857;
  --color-primary-light: #10b981;
  --color-secondary: #16a34a;    /* Verde natural */
  --color-secondary-dark: #15803d;
  --color-secondary-light: #22c55e;
  
  /* Colores complementarios */
  --color-accent: #84cc16;       /* Verde lima */
  --color-accent-dark: #65a30d;
  --color-accent-light: #a3e635;
  
  --color-earth: #92400e;        /* Tierra */
  --color-earth-light: #d97706;
  --color-earth-bg: #fef3c7;
  
  --color-warning: #f59e0b;      /* Amarillo dorado */
  --color-warning-dark: #d97706;
  --color-warning-light: #fbbf24;
  --color-warning-bg: #fef3c7;
  
  --color-danger: #dc2626;       /* Rojo error */
  --color-danger-bg: #fee2e2;
  
  --color-success: --color-secondary;      /* Verde éxito */
  --color-success-bg: #dcfce7;
  
  /* Neutrales con toque natural */
  --color-white: #fefefe;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  
  /* Alias semánticos */
  --bg: var(--color-white);
  --text: var(--color-gray-900);
  --text-muted: var(--color-gray-600);
  --brand: var(--color-primary);
  --warn: var(--color-warning);
  --ok: var(--color-secondary);
  --muted: var(--color-gray-400);
  --accent: var(--color-accent);
  
  /* Tipografía */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Espaciado */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  
  /* Radios */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-base: 0.375rem; /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  
  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
  
  /* Transiciones */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Breakpoints (para referencia en media queries) */
  --bp-sm: 576px;
  --bp-md: 768px;
  --bp-lg: 992px;
  --bp-xl: 1200px;
  --bp-2xl: 1440px;
}

/* =============================================================================
   RESET Y BASE
   ============================================================================= */

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

* {
  margin: 0;
  padding: 0;
}

/* Base */
html {
  font-size: 100%; /* 16px base */
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accesibilidad: foco visible */
*:focus {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* Mejor contraste para foco en elementos oscuros */
.btn--primary:focus,
.footer a:focus {
  outline-color: var(--color-white);
}

/* Indicador de foco para elementos interactivos */
.btn:focus,
.form-field__input:focus,
.form-field__select:focus,
.modal__close:focus,
.banner__close:focus {
  box-shadow: 0 0 0 3px rgb(30 64 175 / 0.3);
}

/* Foco visible para elementos custom */
.card__link:focus,
.banner__link:focus,
.tooltip-trigger:focus {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Accesibilidad: reducir movimiento */
@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;
  }
}

/* =============================================================================
   UTILIDADES DE LAYOUT
   ============================================================================= */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 576px) {
  .container {
    padding: 0 var(--spacing-6);
  }
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-8);
  }
}

/* Grids responsivos */
.section__grid {
  display: grid;
  gap: var(--spacing-6);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .section__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
  }
}

.cards-grid {
  display: grid;
  gap: var(--spacing-6);
  grid-template-columns: 1fr;
}

@media (min-width: 576px) {
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

.form-grid {
  display: grid;
  gap: var(--spacing-4);
  grid-template-columns: 1fr;
}

@media (min-width: 576px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .form-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.pills-grid {
  display: grid;
  gap: var(--spacing-3);
  grid-template-columns: 1fr;
}

@media (min-width: 576px) {
  .pills-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}

/* =============================================================================
   HEADER
   ============================================================================= */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: var(--z-fixed);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  min-height: 60px;
}

@media (min-width: 768px) {
  .header__container {
    padding: var(--spacing-4) var(--spacing-6);
  }
}

.header__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.header__logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  position: relative;
}

.header__logo-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-primary);
}

.header__logo {
  font-size: var(--font-size-lg);
  position: relative;
  z-index: 1;
}

.header__text {
  display: flex;
  flex-direction: column;
}

.header__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--brand);
}

@media (min-width: 768px) {
  .header__title {
    font-size: var(--font-size-xl);
  }
}

.header__subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  display: none;
}

@media (min-width: 576px) {
  .header__subtitle {
    display: inline;
  }
}

.header__nav {
  display: flex;
  gap: var(--spacing-2);
  align-items: center;
}

@media (max-width: 575px) {
  .header__nav {
    flex-direction: column;
    gap: var(--spacing-1);
  }
}

/* =============================================================================
   BANNER ANTI-FRAUDE
   ============================================================================= */

.banner {
  background: var(--color-warning-bg);
  border-bottom: 1px solid var(--color-warning-light);
  padding: var(--spacing-3) 0;
}

.banner--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-dark);
}

.banner__container {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: 0 var(--spacing-4);
}

@media (min-width: 768px) {
  .banner__container {
    padding: 0 var(--spacing-6);
  }
}

.banner__icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.banner__content {
  flex: 1;
}

.banner__text {
  font-size: var(--font-size-sm);
  margin: 0;
}

@media (min-width: 768px) {
  .banner__text {
    font-size: var(--font-size-base);
  }
}

.banner__link {
  background: none;
  border: none;
  color: var(--color-warning-dark);
  text-decoration: underline;
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
  padding: 0;
  margin-left: var(--spacing-1);
}

.banner__link:hover,
.banner__link:focus {
  color: var(--color-warning);
}

.banner__close {
  background: none;
  border: none;
  color: var(--color-warning-dark);
  cursor: pointer;
  font-size: var(--font-size-lg);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-base);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.banner__close:hover,
.banner__close:focus {
  background: var(--color-warning);
  color: var(--color-white);
}

/* =============================================================================
   MAIN Y SECCIONES
   ============================================================================= */

.main {
  margin-top: 60px; /* Altura del header fijo */
  padding-top: var(--spacing-8);
}

.section {
  padding: var(--spacing-12) 0;
  position: relative;
}

.section__background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.section__background--subtle {
  opacity: 0.4;
}

.section__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.section__image--subtle {
  opacity: 0.3;
  filter: blur(1px);
}

.section__overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(5, 150, 105, 0.1) 0%,
    rgba(22, 163, 74, 0.05) 100%
  );
}

.section__overlay--light {
  background: linear-gradient(
    180deg,
    rgba(248, 250, 252, 0.95) 0%,
    rgba(220, 252, 231, 0.90) 100%
  );
}

.section .container {
  position: relative;
  z-index: 2;
}

.section--alt {
  background: transparent; /* Removido para usar imagen de fondo */
}

.section__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text);
  margin-bottom: var(--spacing-6);
  text-align: center;
}

@media (min-width: 768px) {
  .section__title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-8);
  }
}

.section__intro {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: var(--spacing-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* =============================================================================
   HERO
   ============================================================================= */

.hero {
  position: relative;
  color: var(--color-white);
  padding: var(--spacing-16) 0;
  overflow: hidden;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero__background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg, 
    rgba(5, 150, 105, 0.85) 0%, 
    rgba(22, 163, 74, 0.75) 50%, 
    rgba(132, 204, 22, 0.65) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 2;
}

.hero__content {
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-8);
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--font-size-4xl);
  }
}

.hero__card {
  max-width: 800px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.95);
  color: var(--text);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero__micro-copy {
  margin-bottom: var(--spacing-6);
  text-align: center;
}

.hero__micro-copy p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-3);
}

.hero__badge {
  display: flex;
  justify-content: center;
}

.hero__form {
  padding: var(--spacing-6);
}

.hero__btn {
  width: 100%;
  margin-top: var(--spacing-6);
}

/* =============================================================================
   CARDS
   ============================================================================= */

.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  padding: var(--spacing-6);
  transition: box-shadow var(--transition-base);
  overflow: hidden;
  position: relative;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__image {
  margin: calc(-1 * var(--spacing-6)) calc(-1 * var(--spacing-6)) var(--spacing-4) calc(-1 * var(--spacing-6));
  height: 200px;
  overflow: hidden;
  position: relative;
}

.card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-base);
}

.card:hover .card__img {
  transform: scale(1.05);
}

.card__image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(5, 150, 105, 0.1) 100%
  );
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text);
  margin-bottom: var(--spacing-4);
}

.card__content {
  color: var(--text-muted);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-4);
}

.card__icon {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-4);
  text-align: center;
  position: relative;
  z-index: 2;
  background: var(--color-white);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--spacing-4) auto;
  box-shadow: var(--shadow-base);
}

.card__link {
  background: none;
  border: none;
  color: var(--brand);
  text-decoration: none;
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-family: inherit;
  padding: 0;
  transition: color var(--transition-fast);
}

.card__link:hover,
.card__link:focus {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.card--educational {
  text-align: center;
  border: 1px solid var(--color-success-bg);
  background: linear-gradient(145deg, var(--color-white), var(--color-gray-50));
  transition: all var(--transition-base);
}

.card--educational:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* =============================================================================
   FORMULARIOS
   ============================================================================= */

.form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-5);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.form-field__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.form-field__input,
.form-field__select {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-family: inherit;
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px; /* Accesibilidad: tamaño mínimo de toque */
}

.form-field__input:focus,
.form-field__select:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgb(30 64 175 / 0.1);
}

.form-field__input:invalid,
.form-field__select:invalid {
  border-color: var(--color-danger);
}

.form-field__input--error,
.form-field__select--error {
  border-color: var(--color-danger);
  background-color: var(--color-danger-bg);
}

.form-field__input::placeholder {
  color: var(--color-gray-400);
}

.form-field__checkbox {
  width: 18px;
  height: 18px;
  margin-right: var(--spacing-2);
  accent-color: var(--brand);
}

.form-field__help {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.form-field__error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  font-weight: var(--font-weight-medium);
}

/* =============================================================================
   BOTONES
   ============================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-5);
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Accesibilidad */
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--brand);
  color: var(--color-white);
  border-color: var(--brand);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn--secondary {
  background: var(--color-white);
  color: var(--brand);
  border-color: var(--brand);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--color-gray-50);
}

.btn--small {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-xs);
  min-height: 36px;
}

.btn--large {
  padding: var(--spacing-4) var(--spacing-6);
  font-size: var(--font-size-base);
  min-height: 52px;
}

/* =============================================================================
   PILLS Y BADGES
   ============================================================================= */

.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
}

.pill--time {
  background: var(--color-success-bg);
  color: var(--color-secondary-dark);
  border: 1px solid var(--color-secondary-light);
}

.pill--tip {
  background: linear-gradient(45deg, var(--color-gray-100), var(--color-success-bg));
  color: var(--text);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-base);
  text-align: left;
  line-height: var(--line-height-snug);
  border-left: 3px solid var(--color-accent);
}

.pills-section {
  margin-top: var(--spacing-8);
}

.pills-section__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-4);
  text-align: center;
}

/* =============================================================================
   COMPONENTES DE RESULTADO
   ============================================================================= */

.result-placeholder {
  text-align: center;
  color: var(--text-muted);
  padding: var(--spacing-8);
  border: 2px dashed var(--color-gray-300);
  border-radius: var(--radius-base);
}

.result-lines {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.result-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.result-line:last-child {
  border-bottom: 2px solid var(--brand);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  background: var(--color-gray-50);
  margin-top: var(--spacing-2);
  padding: var(--spacing-4);
  border-radius: var(--radius-base);
}

.result-line__label {
  color: var(--text);
}

.result-line__value {
  color: var(--brand);
  font-weight: var(--font-weight-medium);
}

.data-summary {
  background: var(--color-gray-50);
  border-radius: var(--radius-base);
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.data-summary h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-3);
}

.data-summary dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2);
}

.data-summary dt {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.data-summary dd {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-align: right;
}

/* Medidor de huella */
.carbon-gauge {
  width: 100%;
  height: 120px;
  margin: var(--spacing-4) 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.carbon-gauge__track {
  width: 100px;
  height: 100px;
  border: 8px solid var(--color-gray-200);
  border-radius: 50%;
  position: relative;
}

.carbon-gauge__fill {
  position: absolute;
  top: -8px;
  left: -8px;
  width: 100px;
  height: 100px;
  border: 8px solid transparent;
  border-radius: 50%;
  border-top-color: var(--color-accent);
  border-right-color: var(--color-secondary);
  border-bottom-color: var(--color-primary);
  border-left-color: transparent;
  transform: rotate(-90deg);
  transition: transform var(--transition-base);
}

.carbon-gauge__value {
  position: absolute;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

/* =============================================================================
   MODALES
   ============================================================================= */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
}

.modal.modal--active {
  display: flex;
}

.modal__backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgb(0 0 0 / 0.5);
  backdrop-filter: blur(4px);
}

.modal__container {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal--large .modal__container {
  max-width: 800px;
}

.modal__header {
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text);
}

.modal__close {
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-base);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.modal__close:hover,
.modal__close:focus {
  background: var(--color-gray-100);
  color: var(--text);
}

.modal__content {
  padding: var(--spacing-6);
  overflow-y: auto;
  flex: 1;
}

.modal__footer {
  padding: var(--spacing-6);
  border-top: 1px solid var(--color-gray-200);
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
}

.modal__alert {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-light);
  border-radius: var(--radius-base);
  padding: var(--spacing-4);
  margin-top: var(--spacing-4);
}

.modal__alert p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-warning-dark);
}

/* =============================================================================
   STEPPER
   ============================================================================= */

.stepper {
  display: flex;
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--color-gray-200);
  background: var(--color-gray-50);
}

.stepper__step {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3);
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.stepper__step--active {
  color: var(--brand);
}

.stepper__step--completed {
  color: var(--color-success);
}

.stepper__number {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-gray-300);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.stepper__step--active .stepper__number {
  background: var(--brand);
}

.stepper__step--completed .stepper__number {
  background: var(--color-success);
}

.stepper__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  display: none;
}

@media (min-width: 576px) {
  .stepper__label {
    display: block;
  }
}

.step-content {
  display: none;
}

.step-content--active {
  display: block;
}

.step-info {
  background: var(--color-gray-50);
  border-radius: var(--radius-base);
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* =============================================================================
   CHECKLIST Y ACORDEÓN
   ============================================================================= */

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checklist__item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-3) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.checklist__item:last-child {
  border-bottom: none;
}

.checklist__icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.accordion {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-base);
  margin-bottom: var(--spacing-3);
}

.accordion__trigger {
  width: 100%;
  padding: var(--spacing-4);
  background: var(--color-white);
  border: none;
  text-align: left;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.accordion__trigger:hover {
  background: var(--color-gray-50);
}

.accordion__trigger::after {
  content: '+';
  font-size: var(--font-size-lg);
  color: var(--brand);
}

.accordion[open] .accordion__trigger::after {
  content: '−';
}

.accordion__content {
  padding: 0 var(--spacing-4) var(--spacing-4);
  color: var(--text-muted);
  line-height: var(--line-height-relaxed);
}

/* =============================================================================
   TOOLTIP
   ============================================================================= */

.tooltip {
  position: absolute;
  z-index: var(--z-tooltip);
  background: var(--color-gray-900);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-base);
  padding: var(--spacing-2) var(--spacing-3);
  max-width: 200px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.tooltip.tooltip--active {
  opacity: 1;
  visibility: visible;
}

.tooltip__content {
  line-height: var(--line-height-snug);
}

.tooltip__arrow {
  position: absolute;
  width: 0;
  height: 0;
  border: 4px solid transparent;
  border-top-color: var(--color-gray-900);
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
}

.tooltip-trigger {
  background: none;
  border: none;
  cursor: pointer;
  font-size: inherit;
  color: var(--brand);
  padding: 0;
  margin: 0;
}

.tooltip-trigger:hover,
.tooltip-trigger:focus {
  color: var(--color-primary-dark);
}

/* =============================================================================
   FOOTER
   ============================================================================= */

.footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--spacing-12) 0 var(--spacing-6);
}

.footer__content {
  display: grid;
  gap: var(--spacing-8);
  grid-template-columns: 1fr;
  margin-bottom: var(--spacing-8);
}

@media (min-width: 768px) {
  .footer__content {
    grid-template-columns: 1fr 1fr;
  }
}

.footer__section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.footer__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
}

.footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.footer__link {
  color: var(--color-gray-400);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer__link:hover,
.footer__link:focus {
  color: var(--color-white);
}

.footer__metrics {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
}

.metric__label {
  color: var(--color-gray-400);
}

.metric__value {
  color: var(--color-white);
  font-weight: var(--font-weight-medium);
}

.footer__disclaimer {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--spacing-6);
  text-align: center;
}

.footer__disclaimer p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: var(--line-height-relaxed);
}

/* =============================================================================
   UTILIDADES DE ESTADO
   ============================================================================= */

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

.hidden {
  display: none !important;
}

.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;
}

/* =============================================================================
   RESPONSIVE OVERRIDES
   ============================================================================= */

@media (max-width: 575px) {
  .modal__container {
    margin: var(--spacing-4);
    max-height: calc(100vh - 2rem);
  }

  .modal__header,
  .modal__content,
  .modal__footer {
    padding: var(--spacing-4);
  }

  .stepper {
    flex-direction: column;
    gap: var(--spacing-2);
  }

  .stepper__step {
    padding: var(--spacing-2);
  }

  .form-grid {
    grid-template-columns: 1fr !important;
  }

  .header__logo-img {
    width: 32px;
    height: 32px;
  }

  .header__brand {
    gap: var(--spacing-2);
  }

  .card__image {
    height: 150px;
  }

  .hero {
    min-height: 60vh;
    padding: var(--spacing-12) 0;
  }
}

@media (max-width: 768px) {
  .hero__image,
  .section__image {
    object-position: center center;
  }

  .card__image {
    height: 180px;
  }
}

/* Optimización para pantallas de alta densidad */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .hero__image,
  .section__image,
  .card__img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* =============================================================================
   ANIMACIONES
   ============================================================================= */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    height: 0;
    opacity: 0;
  }
  to {
    height: auto;
    opacity: 1;
  }
}

.animate-fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

.animate-slide-down {
  animation: slideDown var(--transition-base) ease-out;
}

/* =============================================================================
   PRINT STYLES
   ============================================================================= */

@media print {
  .header,
  .banner,
  .modal,
  .tooltip,
  .btn,
  .footer__metrics,
  .hero__image,
  .section__image,
  .card__img {
    display: none !important;
  }

  .main {
    margin-top: 0;
  }

  body {
    background: white;
    color: black;
    font-size: 12pt;
    line-height: 1.4;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}

/* =============================================================================
   ELEMENTOS INSTITUCIONALES
   ============================================================================= */

/* Efectos de carga progresiva para imágenes */
.hero__image,
.section__image,
.card__img {
  transition: opacity var(--transition-base);
}

.hero__image[loading],
.section__image[loading],
.card__img[loading] {
  opacity: 0.7;
}

/* Estilos institucionales para texto sobre imágenes */
.section__title {
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 3;
}

/* Título blanco para sección educativa con fondo de imagen */
#seccion-educativa .section__title {
  color: var(--color-white);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7);
  background: rgba(0, 0, 0, 0.3);
  padding: var(--spacing-4) var(--spacing-6);
  border-radius: var(--radius-lg);
  display: inline-block;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.section--alt .section__title,
.section--alt .section__intro {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: var(--spacing-4) var(--spacing-6);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-8);
  display: inline-block;
  box-shadow: var(--shadow-sm);
}

.section--alt .section__intro {
  margin-left: auto;
  margin-right: auto;
  display: block;
  text-align: center;
}

/* Mejora visual para cards educativas */
.card--educational {
  border: 1px solid rgba(5, 150, 105, 0.2);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(5px);
}

.card--educational:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}