/* =========================================
   MIRAI FORMAT - Liquid Glass iOS Style
   ========================================= */

/* =========================================
   1. Variables de Tema
   ========================================= */

/* Tema Claro (Default) */

:root {
  /* Fondo y Gradientes */
  --bg-body: linear-gradient(135deg, #e0eafc 0%, #cfdef3 100%);
  --bg-body-animated: linear-gradient(-45deg, #e0eafc, #cfdef3, #f5f7fa, #c3cfe2);
  
  /* Efecto Glass */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-bg-strong: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.1);
  --glass-shadow-hover: 0 12px 40px rgba(31, 38, 135, 0.15);
  --glass-blur: blur(20px);
  
  /* Colores Principales */
  --color-primary: #2C3E50;
  --color-secondary: #5D4037;
  --color-accent: #3498DB;
  --color-accent-hover: #2980B9;
  --color-success: #27AE60;
  --color-warning: #F39C12;
  --color-error: #E74C3C;
  
  /* Textos */
  --text-main: #1a1a2e;
  --text-muted: #5a5a7a;
  --text-light: #ffffff;
  
  /* Fondos de Elementos */
  --bg-card: rgba(255, 255, 255, 0.5);
  --bg-input: rgba(255, 255, 255, 0.7);
  --bg-column: rgba(255, 255, 255, 0.4);
  
  /* Bordes y Radio */
  --radius-large: 24px;
  --radius-medium: 16px;
  --radius-small: 8px;
  --radius-pill: 50px;
  
  /* Sombras */
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-strong: 0 12px 40px rgba(0, 0, 0, 0.18);
  
  /* Transiciones */
  --transition-fast: all 0.15s ease-out;
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Espaciado */
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 20px;
  --spacing-lg: 30px;
  --spacing-xl: 40px;
  --spacing-xxl: 60px;
}

/* Tema Oscuro */
[data-theme="dark"] {
  --bg-body: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  --bg-body-animated: linear-gradient(-45deg, #0f0c29, #302b63, #24243e, #1a1a2e);
  
  --glass-bg: rgba(20, 20, 35, 0.65);
  --glass-bg-strong: rgba(20, 20, 35, 0.85);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --glass-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
  --glass-blur: blur(25px);
  
  --color-primary: #E8E8E8;
  --color-secondary: #B8A090;
  --color-accent: #5DADE2;
  --color-accent-hover: #3498DB;
  --color-success: #2ECC71;
  --color-warning: #F1C40F;
  --color-error: #E74C3C;
  
  --text-main: #f0f0f0;
  --text-muted: #a0a0b0;
  --text-light: #ffffff;
  
  --bg-card: rgba(30, 30, 45, 0.6);
  --bg-input: rgba(50, 50, 70, 0.5);
  --bg-column: rgba(35, 35, 50, 0.5);
}

/* Tema Sakura (Flores de Cerezo) */
[data-theme="sakura"] {
  --bg-body: linear-gradient(135deg, #ffdde1 0%, #ee9ca7 50%, #ffdde1 100%);
  --bg-body-animated: linear-gradient(-45deg, #ffdde1, #ee9ca7, #ffe5e9, #f8cdd7);
  
  --glass-bg: rgba(255, 240, 245, 0.7);
  --glass-bg-strong: rgba(255, 240, 245, 0.9);
  --glass-border: rgba(255, 182, 193, 0.4);
  --glass-shadow: 0 8px 32px rgba(255, 105, 180, 0.15);
  --glass-shadow-hover: 0 12px 40px rgba(255, 105, 180, 0.2);
  --glass-blur: blur(20px);
  
  --color-primary: #8B4558;
  --color-secondary: #A0522D;
  --color-accent: #FF69B4;
  --color-accent-hover: #FF1493;
  --color-success: #2ECC71;
  --color-warning: #F39C12;
  --color-error: #E74C3C;
  
  --text-main: #4A3728;
  --text-muted: #8B7355;
  --text-light: #FFF0F5;
  
  --bg-card: rgba(255, 230, 240, 0.5);
  --bg-input: rgba(255, 240, 245, 0.6);
  --bg-column: rgba(255, 235, 245, 0.4);
}

/* =========================================
   2. Reset y Estilos Base
   ========================================= */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-body);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-sm) var(--spacing-xxl);
  transition: var(--transition-smooth);
  overflow-x: hidden;
}

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

/* =========================================
   3. Fondo Animado
   ========================================= */

.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: floatOrb 20s ease-in-out infinite;
}

.orb-1 {
  width: 300px;
  height: 300px;
  background: var(--color-accent);
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 250px;
  height: 250px;
  background: var(--color-secondary);
  top: 60%;
  right: 15%;
  animation-delay: -7s;
}

.orb-3 {
  width: 200px;
  height: 200px;
  background: var(--color-primary);
  bottom: 15%;
  left: 30%;
  animation-delay: -14s;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -50px) scale(1.1); }
  66% { transform: translate(-20px, 30px) scale(0.9); }
}

/* =========================================
   4. Selector de Tema
   ========================================= */

.theme-selector {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  display: flex;
  gap: var(--spacing-xs);
  z-index: 1000;
  padding: var(--spacing-xs);
  transition: var(--transition-smooth);
}

.theme-btn {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  font-size: 1.3rem;
  transition: var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  box-shadow: var(--shadow-soft);
}

.theme-btn:hover {
  transform: scale(1.15) rotate(5deg);
  background: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-medium);
}

.theme-btn:active {
  transform: scale(0.95);
}

.theme-btn.active {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 0 20px var(--color-accent);
  transform: scale(1.1);
}

/* =========================================
   5. Efecto Liquid Glass
   ========================================= */

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-large);
  transition: var(--transition-smooth);
}

.glass-panel:hover {
  box-shadow: var(--glass-shadow-hover);
  transform: translateY(-2px);
}

/* =========================================
   6. Contenedor Principal
   ========================================= */

.app-container {
  width: 100%;
  max-width: 1200px;
  margin: var(--spacing-xxl) auto var(--spacing-xl);
  padding: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

/* =========================================
   7. Header
   ========================================= */

header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--glass-border);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  border-radius: var(--radius-medium);
}

.logo-text h1 {
  color: var(--color-primary);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin: 0;
  line-height: 1.1;
  text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.tagline {
  display: block;
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 500;
  margin-top: var(--spacing-xs);
}

/* =========================================
   8. Barra de Progreso
   ========================================= */

.progress-container {
  width: 100%;
  height: 10px;
  background: var(--bg-input);
  border-radius: var(--radius-pill);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: var(--radius-pill);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 15px var(--color-accent);
  position: relative;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-text {
  display: block;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

/* =========================================
   9. Mensaje de Estado
   ========================================= */

.status-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.status-icon {
  font-size: 2rem;
  animation: wave 2s infinite;
}

@keyframes wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(10deg); }
  75% { transform: rotate(-10deg); }
}

.status-message {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 500;
}

/* =========================================
   10. Contenido Principal - 2 Columnas
   ========================================= */

.main-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.column {
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  min-height: 400px;
}

.column-header {
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--glass-border);
}

.column-header .step-title {
  margin-bottom: var(--spacing-xs);
  font-size: 1.4rem;
  color: var(--color-primary);
  font-weight: 700;
}

.column-subtitle {
  display: block;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* =========================================
   11. Zona de Carga (Drag & Drop)
   ========================================= */

.upload-area {
  border: 2px dashed var(--color-secondary);
  border-radius: var(--radius-medium);
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
  background: var(--bg-input);
  cursor: pointer;
  transition: var(--transition-smooth);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
}

.upload-area:hover, .upload-area.drag-over {
  background: var(--glass-bg);
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
  border-style: solid;
}

.upload-icon {
  font-size: 3.5rem;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
  display: block;
  transition: var(--transition-smooth);
}

.upload-area:hover .upload-icon {
  transform: scale(1.1);
}

.upload-text {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.5;
}

.upload-text strong {
  color: var(--color-primary);
  font-weight: 700;
}

/* =========================================
   12. Lista de Archivos
   ========================================= */

.file-list {
  list-style: none;
  margin-top: var(--spacing-md);
  flex-grow: 1;
  overflow-y: auto;
  max-height: 280px;
  padding-right: var(--spacing-xs);
}

.file-list::-webkit-scrollbar {
  width: 8px;
}

.file-list::-webkit-scrollbar-track {
  background: var(--bg-input);
  border-radius: var(--radius-pill);
}

.file-list::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: var(--radius-pill);
}

.file-list::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-hover);
}

.file-item {
  background: var(--bg-card);
  padding: var(--spacing-md);
  border-radius: var(--radius-medium);
  margin-bottom: var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-left: 4px solid var(--color-accent);
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-soft);
}

.file-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-medium);
}

.file-name {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 60%;
}

.file-size {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: var(--spacing-sm);
}

.remove-file {
  background: none;
  border: none;
  color: var(--color-error);
  cursor: pointer;
  font-size: 1.3rem;
  padding: var(--spacing-xs);
  transition: var(--transition-bounce);
  line-height: 1;
}

.remove-file:hover {
  color: #c0392b;
  transform: scale(1.2) rotate(90deg);
}

/* =========================================
   13. Estadísticas de Columna
   ========================================= */

.column-stats {
  display: flex;
  gap: var(--spacing-xl);
  margin-top: auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
  margin-top: var(--spacing-xs);
}

/* =========================================
   14. Formularios e Inputs
   ========================================= */

.rule-input-group {
  margin-bottom: var(--spacing-lg);
}

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

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-primary);
  font-size: 1rem;
}

input[type="text"],
select {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-medium);
  background: var(--bg-input);
  font-size: 1rem;
  color: var(--text-main);
  transition: var(--transition-smooth);
  outline: none;
  backdrop-filter: var(--glass-blur);
  font-weight: 500;
}

input[type="text"]:focus,
select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.2);
  background: var(--bg-card);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

/* =========================================
   15. Checkbox Personalizado
   ========================================= */

.checkbox-wrapper {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-sm);
}

.custom-checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-main);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-card);
  border-radius: var(--radius-medium);
  border: 2px solid var(--glass-border);
  transition: var(--transition-smooth);
  flex: 1;
  justify-content: center;
  min-width: 100px;
}

.custom-checkbox:hover {
  border-color: var(--color-accent);
  background: var(--glass-bg);
  transform: translateY(-2px);
}

.custom-checkbox input {
  appearance: none;
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius-small);
  background: var(--bg-input);
  position: relative;
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.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: 14px;
  font-weight: bold;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.checkbox-label {
  font-weight: 600;
}

/* =========================================
   16. Tabla de Reglas
   ========================================= */

.table-container {
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: var(--radius-medium);
}

.rules-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 var(--spacing-sm);
}

.rules-table th {
  text-align: left;
  padding: var(--spacing-md) var(--spacing-sm);
  color: var(--color-secondary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--glass-bg);
  border-radius: var(--radius-small);
}

.rules-table td {
  background: var(--bg-card);
  padding: var(--spacing-md) var(--spacing-sm);
  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); }

.rules-table tbody tr {
  box-shadow: var(--shadow-soft);
  transition: var(--transition-smooth);
}

.rules-table tbody tr:hover {
  box-shadow: var(--shadow-medium);
  transform: scale(1.02);
}

.rule-keyword {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1rem;
}

.rule-styles {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.style-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(52, 152, 219, 0.15);
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.remove-rule {
  background: none;
  border: none;
  color: var(--color-error);
  cursor: pointer;
  font-size: 1.3rem;
  padding: var(--spacing-xs);
  transition: var(--transition-bounce);
  line-height: 1;
}

.remove-rule:hover {
  color: #c0392b;
  transform: scale(1.3) rotate(90deg);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  padding: var(--spacing-lg) !important;
}

/* =========================================
   17. Botones
   ========================================= */

.btn {
  display: inline-block;
  padding: var(--spacing-lg) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-medium);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-bounce);
  text-align: center;
  text-decoration: none;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  box-shadow: 0 4px 20px rgba(44, 62, 80, 0.3);
  width: 100%;
  margin-top: var(--spacing-md);
  font-size: 1.1rem;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(44, 62, 80, 0.4);
  filter: brightness(1.1);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-accent {
  background: var(--color-accent);
  color: white;
  width: 100%;
  margin-top: var(--spacing-md);
  box-shadow: 0 4px 20px rgba(52, 152, 219, 0.3);
}

.btn-accent:hover {
  background: var(--color-accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(52, 152, 219, 0.4);
}

.btn-accent:active {
  transform: translateY(-1px);
}

.step-actions {
  margin-top: var(--spacing-md);
}

/* =========================================
   18. Footer
   ========================================= */

.app-footer {
  width: 100%;
  max-width: 1200px;
  margin: var(--spacing-md) auto 0;
  padding: var(--spacing-lg);
  text-align: center;
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.app-footer p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
  font-weight: 500;
}

.app-footer a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.app-footer a:hover {
  text-decoration: underline;
  color: var(--color-accent-hover);
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.85rem;
}

/* =========================================
   19. Responsive - Móviles
   ========================================= */

@media (max-width: 992px) {
  .app-container {
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
  }
  
  .logo-text h1 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  body {
    padding: var(--spacing-sm) var(--spacing-xs) var(--spacing-xl);
  }
  
  .theme-selector {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
  }
  
  .theme-btn {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
  }
  
  .app-container {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
  }
  
  .logo-container {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
  
  .logo-icon {
    width: 56px;
      height: 56px;
  }
  
  .logo-text h1 {
    font-size: 1.8rem;
  }
  
  .main-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .column {
    min-height: auto;
    padding: var(--spacing-lg);
  }
  
  .upload-area {
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: 160px;
  }
  
  .upload-icon {
    font-size: 2.5rem;
  }
  
  .checkbox-wrapper {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .custom-checkbox {
    width: 100%;
    justify-content: flex-start;
    min-width: auto;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .theme-selector {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
  }
  
  .theme-btn {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* =========================================
   20. Accesibilidad y Preferencias
   ========================================= */

/* Modo de reducción de 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;
  }
  
  .background-animation {
    display: none;
  }
  
  .orb-1, .orb-2, .orb-3 {
    display: none;
  }
}

/* Alto contraste */
@media (prefers-contrast: high) {
  :root {
    --glass-bg: rgba(255, 255, 255, 0.95);
    --glass-border: #000;
    --glass-shadow: 0 0 0 2px #000;
  }
  
  [data-theme="dark"] {
    --glass-bg: rgba(0, 0, 0, 0.95);
    --glass-border: #fff;
    --glass-shadow: 0 0 0 2px #fff;
  }
}

/* =========================================
   21. Utilidades Extra
   ========================================= */

/* Ocultar elemento */
.hidden {
  display: none !important;
}

/* Visually hidden (para lectores de pantalla) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Texto de ayuda */
.help-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
  display: block;
}

/* Estado de carga */
.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* =========================================
   22. Impresión
   ========================================= */

@media print {
  body {
    background: white;
    animation: none;
  }
  
  .background-animation,
  .theme-selector,
  .upload-area,
  .btn,
  .remove-file,
  .remove-rule {
    display: none !important;
  }
  
  .app-container {
    margin: 0;
    padding: 0;
    box-shadow: none;
    border: none;
  }
  
  .glass-panel {
    background: white;
    border: 1px solid #ddd;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  
  .column {
    break-inside: avoid;
  }
}

/* =========================================
   23. Animaciones de Entrada
   ========================================= */

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

.glass-panel {
  animation: fadeInUp 0.5s ease-out forwards;
}

.glass-panel:nth-child(1) { animation-delay: 0.1s; }
.glass-panel:nth-child(2) { animation-delay: 0.2s; }
.glass-panel:nth-child(3) { animation-delay: 0.3s; }
.glass-panel:nth-child(4) { animation-delay: 0.4s; }

/* =========================================
   Fin del CSS
   ========================================= */

/* =========================================
   Footer Estilos
   ========================================= */

.app-footer {
  width: 100%;
  max-width: 1200px;
  margin: var(--spacing-md) auto var(--spacing-xl);
  padding: var(--spacing-xl);
  border-top: 1px solid var(--glass-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

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

.footer-title {
  color: var(--color-primary);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--color-accent);
  transform: translateX(5px);
}

.footer-logo {
  max-width: 160px;
  height: auto;
  margin-bottom: var(--spacing-md);
  border-radius: var(--radius-medium);
  transition: var(--transition-smooth);
}

.footer-logo:hover {
  transform: scale(1.05);
}

.social-icons {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.social-item {
  display: inline-block;
}

.social-item a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-small);
  background: var(--bg-input);
  transition: var(--transition-smooth);
  border: 1px solid var(--glass-border);
}

.social-item a:hover {
  background: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.social-item img {
  width: 24px;
  height: 24px;
  filter: brightness(0) invert(0.5);
  transition: var(--transition-smooth);
}

[data-theme="dark"] .social-item img {
  filter: brightness(0) invert(1);
}

[data-theme="sakura"] .social-item img {
  filter: brightness(0) invert(0.3);
}

.social-item a:hover img {
  filter: brightness(0) invert(1);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
  font-weight: 500;
}

.footer-bottom a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.footer-bottom a:hover {
  text-decoration: underline;
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* =========================================
   Footer Responsive
   ========================================= */

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .app-footer {
    padding: var(--spacing-lg);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .social-icons {
    justify-content: center;
  }
}