/* =========================================
   Variables de Diseño (Paleta Azul/Marrón)
   ========================================= */
:root {
  /* Colores Principales */
  --color-primary: #2C3E50;       /* Azul oscuro corporativo */
  --color-secondary: #5D4037;     /* Marrón tierra elegante */
  --color-accent: #3498DB;        /* Azul brillante para acciones */
  --color-accent-hover: #2980B9;  /* Azul más oscuro para hover */
  
  /* Fondos y Superficies */
  --bg-body: #F4F6F8;             /* Gris muy claro, casi blanco */
  --bg-card: #FFFFFF;             /* Blanco puro */
  --bg-input: #F9FAFB;            /* Fondo suave para inputs */
  
  /* Textos */
  --text-main: #333333;           /* Gris oscuro para lectura */
  --text-muted: #7F8C8D;          /* Gris medio para secundarios */
  --text-light: #ECF0F1;          /* Blanco sucio para fondos oscuros */
  
  /* Bordes y Sombras */
  --radius-large: 24px;           /* Bordes muy redondeados solicitados */
  --radius-medium: 16px;          /* Redondez media */
  --radius-small: 8px;            /* Redondez pequeña */
  --shadow-soft: 0 4px 20px rgba(44, 62, 80, 0.08); /* Sombra sutil y difusa */
  --shadow-hover: 0 8px 30px rgba(44, 62, 80, 0.15); /* Sombra al interactuar */
  
  /* Transiciones */
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
}

/* =========================================
   Contenedor Principal
   ========================================= */
.app-container {
  width: 100%;
  max-width: 900px;
  background: var(--bg-card);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-soft);
  padding: 40px;
  margin-bottom: 40px;
  transition: var(--transition-smooth);
}

h1 {
  color: var(--color-primary);
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 40px;
  font-size: 1rem;
}

/* =========================================
   Secciones (Pasos del Wizard)
   ========================================= */
.step-section {
  margin-bottom: 30px;
  padding: 30px;
  background: var(--bg-body);
  border-radius: var(--radius-medium);
  border: 1px solid rgba(44, 62, 80, 0.05);
}

.step-title {
  color: var(--color-secondary);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* =========================================
   Zona de Carga (Drag & Drop)
   ========================================= */
.upload-area {
  border: 2px dashed var(--color-secondary);
  border-radius: var(--radius-large);
  padding: 50px 20px;
  text-align: center;
  background: rgba(93, 64, 55, 0.03);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.upload-area:hover, .upload-area.drag-over {
  background: rgba(93, 64, 55, 0.08);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.upload-icon {
  font-size: 3rem;
  color: var(--color-secondary);
  margin-bottom: 15px;
  display: block;
}

.upload-text {
  color: var(--text-muted);
  font-size: 1rem;
}

.upload-text strong {
  color: var(--color-primary);
}

.file-list {
  list-style: none;
  margin-top: 20px;
}

.file-item {
  background: var(--bg-card);
  padding: 15px;
  border-radius: var(--radius-small);
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.03);
  border-left: 4px solid var(--color-accent);
}

/* =========================================
   Formularios e Inputs
   ========================================= */
.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--color-primary);
  font-size: 0.95rem;
}

input[type="text"],
select {
  width: 100%;
  padding: 14px 20px;
  border: 1px solid #E0E0E0;
  border-radius: var(--radius-medium);
  background: var(--bg-input);
  font-size: 1rem;
  color: var(--text-main);
  transition: var(--transition-smooth);
  outline: none;
}

input[type="text"]:focus,
select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
  background: var(--bg-card);
}

/* =========================================
   Tabla de Reglas
   ========================================= */
.rules-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 10px;
}

.rules-table th {
  text-align: left;
  padding: 15px;
  color: var(--color-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.rules-table td {
  background: var(--bg-card);
  padding: 15px;
  vertical-align: middle;
}

.rules-table tr:first-child td:first-child { border-top-left-radius: var(--radius-medium); }
.rules-table tr:first-child td:last-child { border-top-right-radius: var(--radius-medium); }
.rules-table tr:last-child td:first-child { border-bottom-left-radius: var(--radius-medium); }
.rules-table tr:last-child td:last-child { border-bottom-right-radius: var(--radius-medium); }

/* Checkbox personalizado */
.checkbox-wrapper {
  display: flex;
  gap: 15px;
}

.custom-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-main);
}

.custom-checkbox input {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-secondary);
  border-radius: 6px;
  background: var(--bg-input);
  position: relative;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.custom-checkbox input:checked {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
}

.custom-checkbox input:checked::after {
  content: '✓';
  position: absolute;
  color: white;
  font-size: 12px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* =========================================
   Botones
   ========================================= */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius-large);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: center;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  box-shadow: 0 4px 15px rgba(44, 62, 80, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(44, 62, 80, 0.4);
  filter: brightness(1.05);
}

.btn-secondary {
  background: white;
  color: var(--color-secondary);
  border: 2px solid var(--color-secondary);
}

.btn-secondary:hover {
  background: rgba(93, 64, 55, 0.05);
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--color-accent);
  color: white;
}

.btn-accent:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
  margin-top: 20px;
}

/* =========================================
   Estado de Descarga y Resultados
   ========================================= */
.result-card {
  background: var(--bg-card);
  border: 1px solid #E0E0E0;
  border-radius: var(--radius-medium);
  padding: 20px;
  margin-bottom: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.status-badge {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status-success {
  background: rgba(46, 204, 113, 0.15);
  color: #27AE60;
}

.status-pending {
  background: rgba(241, 196, 15, 0.15);
  color: #F39C12;
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
  .app-container {
    padding: 20px;
    border-radius: var(--radius-medium);
  }
  
  .rules-table {
    display: block;
    overflow-x: auto;
  }
  
  .checkbox-wrapper {
    flex-wrap: wrap;
  }
}