/* ====================================
   SISTEMA DE ESTILOS UNIFICADO
   DISTRIALTURAS & SALUD LABORAL SAS
   ==================================== */

/* ====================================
   1. VARIABLES CSS GLOBALES
   ==================================== */

:root {
  /* Colores principales */
  --primary-color: #1e7fcd;
  --primary-dark: #3e50b4;
  --primary-light: #1e7fcd;

  /* Colores secundarios */
  --secondary-color: #6c757d;
  --secondary-light: #e9ecef;
  --secondary-dark: #495057;

  /* Colores de estado */
  --success-color: #28a745;
  --success-light: #d4edda;
  --error-color: #dc3545;
  --error-light: #f8d7da;
  --warning-color: #ffc107;
  --warning-light: #fff3cd;

  /* Colores neutros */
  --white: #ffffff;
  --light-gray: #f8f9fa;
  --medium-gray: #e9ecef;
  --dark-gray: #2c3e50;
  --text-dark: #333333;
  --text-medium: #6c757d;
  --text-light: #ffffff;

  /* Gradientes unificados */
  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  --gradient-secondary: linear-gradient(135deg, var(--light-gray), var(--medium-gray));
  --gradient-success: linear-gradient(135deg, var(--success-color), #1e7e34);
  --gradient-error: linear-gradient(135deg, var(--error-color), #c82333);

  /* Tipografía */
  --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-secondary: "Arial", sans-serif;

  --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: 2rem;      /* 32px */
  --font-size-4xl: 2.5rem;    /* 40px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Espaciado */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 5rem;     /* 80px */

  /* Bordes y radios */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-2xl: 20px;
  --border-radius-full: 50px;

  --border-width: 1px;
  --border-width-thick: 2px;
  --border-color: var(--medium-gray);
  --border-color-focus: var(--primary-color);

  /* Sombras */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.15);
  --shadow-focus: 0 0 0 3px rgba(0, 123, 255, 0.1);

  /* Transiciones */
  --transition-fast: all 0.15s ease;
  --transition-normal: all 0.3s ease;
  --transition-slow: all 0.5s ease;

  /* Breakpoints (para referencia) */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1400px;
}

/* ====================================
   2. RESET Y BASE
   ==================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ====================================
   3. TIPOGRAFÍA UNIFICADA
   ==================================== */

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

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

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

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

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* ====================================
   4. CONTENEDORES Y LAYOUT
   ==================================== */

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

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

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

.section-alt {
  background: var(--gradient-secondary);
}

/* ====================================
   5. TÍTULOS DE SECCIÓN UNIFICADOS
   ==================================== */

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--dark-gray);
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
  display: inline-block;
  width: 100%;
}

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

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-medium);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.6;
}

/* ====================================
   6. BOTONES UNIFICADOS
   ==================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  gap: var(--space-sm);
}

.btn:focus {
  outline: none;
  box-shadow: var(--shadow-focus);
}

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

/* Variantes de botones */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-light);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--text-light);
  text-decoration: none;
}

.btn-secondary {
  background: var(--white);
  color: var(--text-dark);
  border: var(--border-width-thick) solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--light-gray);
  border-color: var(--primary-color);
  color: var(--primary-color);
  text-decoration: none;
}

.btn-success {
  background: var(--gradient-success);
  color: var(--text-light);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--text-light);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  border: var(--border-width-thick) solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: var(--text-light);
  text-decoration: none;
}

/* Tamaños de botones */
.btn-sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
  border-radius: var(--border-radius-xl);
}

/* ====================================
   7. CARDS UNIFICADAS
   ==================================== */

.card {
  background: var(--white);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: var(--transition-normal);
  position: relative;
}

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

.card-header {
  padding: var(--space-xl);
  background: var(--gradient-primary);
  color: var(--text-light);
}

.card-body {
  padding: var(--space-xl);
}

.card-footer {
  padding: var(--space-lg) var(--space-xl);
  background: var(--light-gray);
  border-top: var(--border-width) solid var(--border-color);
}

/* ====================================
   8. FORMULARIOS UNIFICADOS
   ==================================== */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-dark);
  margin-bottom: var(--space-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--text-dark);
  background: var(--light-gray);
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  transition: var(--transition-normal);
  box-sizing: border-box;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  background: var(--white);
  border-color: var(--border-color-focus);
  box-shadow: var(--shadow-focus);
  transform: translateY(-1px);
}

.form-input::placeholder {
  color: var(--text-medium);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Estados de validación */
.form-input.error,
.form-textarea.error {
  border-color: var(--error-color) !important;
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.form-input.success,
.form-textarea.success {
  border-color: var(--success-color);
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

.form-input.valid {
  border-color: var(--success-color);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='m2.3 6.73.711-.71L4.3 4.735 6.997 2.039l.71.71-3.408 3.408L2.3 6.73z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 16px;
  padding-right: 35px;
}

.form-error {
  color: var(--error-color);
  font-size: var(--font-size-sm);
  margin-top: var(--space-xs);
  display: block;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.form-error.show {
  opacity: 1;
}

/* ====================================
   9. CHECKBOX Y RADIO PERSONALIZADOS
   ==================================== */

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.form-checkbox {
  display: none;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  cursor: pointer;
  position: relative;
}

.checkmark {
  width: 18px;
  height: 18px;
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-normal);
  flex-shrink: 0;
  margin-top: 1px;
}

.form-checkbox:checked + .checkbox-label .checkmark {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.form-checkbox:checked + .checkbox-label .checkmark::after {
  content: '✓';
  color: var(--white);
  font-size: 11px;
  font-weight: var(--font-weight-bold);
}

.form-checkbox:focus + .checkbox-label .checkmark {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* ====================================
   10. MENSAJES DE ESTADO
   ==================================== */

.form-result,
.form-message {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius-md);
  margin-top: var(--space-md);
  font-weight: var(--font-weight-medium);
  text-align: center;
  display: none;
  animation: slideIn 0.3s ease-out;
}

.form-result.success,
.form-message.success {
  background: var(--success-light);
  color: #155724;
  border: var(--border-width) solid #c3e6cb;
  display: block;
}

.form-result.error,
.form-message.error {
  background: var(--error-light);
  color: #721c24;
  border: var(--border-width) solid #f5c6cb;
  display: block;
}

.form-result.info,
.form-message.info {
  background: #d1ecf1;
  color: #0c5460;
  border: var(--border-width) solid #bee5eb;
  display: block;
}

/* ====================================
   11. BOTÓN FLOTANTE WHATSAPP
   ==================================== */

.whatsapp-float {
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 60px;
  height: 60px;
  background-color: #25d366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
  cursor: pointer;
  transition: var(--transition-normal);
  z-index: 1000;
  text-decoration: none;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 25px rgba(37, 211, 102, 0.6);
  text-decoration: none;
}

.whatsapp-float svg {
  width: 32px;
  height: 32px;
  fill: white;
}

/* Animación de pulso */
.whatsapp-float::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #25d366;
  animation: pulse 2s infinite;
  z-index: -1;
}

.whatsapp-float .tooltip {
  position: absolute;
  right: 70px;
  top: 50%;
  transform: translateY(-50%);
  background-color: #333;
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 14px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.whatsapp-float .tooltip::after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: #333;
}

.whatsapp-float:hover .tooltip {
  opacity: 1;
  visibility: visible;
}

/* ====================================
   12. UTILIDADES
   ==================================== */

/* Espaciado */
.m-0 { margin: 0; }
.m-1 { margin: var(--space-xs); }
.m-2 { margin: var(--space-sm); }
.m-3 { margin: var(--space-md); }
.m-4 { margin: var(--space-lg); }
.m-5 { margin: var(--space-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-xs); }
.p-2 { padding: var(--space-sm); }
.p-3 { padding: var(--space-md); }
.p-4 { padding: var(--space-lg); }
.p-5 { padding: var(--space-xl); }

/* Texto */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-medium); }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }

.text-bold { font-weight: var(--font-weight-bold); }
.text-semibold { font-weight: var(--font-weight-semibold); }
.text-normal { font-weight: var(--font-weight-normal); }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }

/* Flex */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

/* ====================================
   13. ANIMACIONES GLOBALES
   ==================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.7;
  }
  100% {
    transform: scale(1.4);
    opacity: 0;
  }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* ====================================
   14. RESPONSIVE DESIGN
   ==================================== */

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-sm);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-subtitle {
    font-size: var(--font-size-base);
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }

  .btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
  }

  .card-body,
  .card-header {
    padding: var(--space-lg);
  }

  .form-input,
  .form-textarea {
    padding: var(--space-sm) var(--space-md);
    font-size: 16px; /* Previene zoom en iOS */
  }

  .whatsapp-float {
    width: 55px;
    height: 55px;
    bottom: 20px;
    right: 20px;
  }

  .whatsapp-float svg {
    width: 28px;
    height: 28px;
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: var(--font-size-xl);
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .card-body,
  .card-header {
    padding: var(--space-md);
  }

  .form-group {
    margin-bottom: var(--space-md);
  }
}

/* ====================================
   15. MODO OSCURO Y ACCESIBILIDAD
   ==================================== */

@media (prefers-contrast: high) {
  .form-input,
  .form-textarea {
    border-width: 2px;
  }
  
  .form-result,
  .form-message {
    border-width: 2px;
  }
  
  .btn {
    border: 2px solid transparent;
  }
}

@media (prefers-color-scheme: dark) {
  .form-result.success,
  .form-message.success {
    background-color: #1e3a2e;
    color: #4fda6a;
    border-color: #2d5a3d;
  }
  
  .form-result.error,
  .form-message.error {
    background-color: #3a1e1e;
    color: #f56565;
    border-color: #5a2d2d;
  }
  
  .form-error {
    color: #f56565;
  }
}