/* ===================================
   KDS Auth Page - Modern Redesign
   Matching Dashboard & Landing Style
   =================================== */

/* Variables de Diseño (consistentes con dashboard/index) */
:root {
  /* Colores principales - Basados en logo KDS */
  --primary: #1a5f7a;
  --primary-hover: #0f3d4f;
  --primary-light: #d4e9f0;
  
  --secondary: #57cc99;
  --success: #57cc99;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #2d8baa;
  
  /* Grises */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Backgrounds */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  
  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  /* Borders */
  --border-color: #e2e8f0;
  --border-radius: 0.75rem;
  --border-radius-lg: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Transitions */
  --transition: all 0.2s ease;
}

/* ===== BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  position: relative;
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Touch optimization */
button, a, .tab, .btn {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* Safe area for notch devices */
@supports (padding: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: max(var(--spacing-lg), env(safe-area-inset-bottom));
  }
}

/* Decorative background gradient */
body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(87, 204, 153, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

/* ===== AUTH CONTAINER ===== */
.auth-container {
  background: var(--bg-card);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 480px;
  width: 100%;
  overflow: hidden;
  position: relative;
  animation: slideUp 0.4s ease;
}

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

/* ===== AUTH HEADER ===== */
.auth-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: white;
  padding: var(--spacing-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.auth-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.auth-header h1 {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.auth-header .logo-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.auth-header .logo-icon svg {
  width: 24px;
  height: 24px;
  stroke: white;
}

.auth-header p {
  opacity: 0.95;
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
  position: relative;
}

/* ===== AUTH BODY ===== */
.auth-body {
  padding: var(--spacing-2xl);
}

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  background: var(--gray-100);
  padding: var(--spacing-xs);
  border-radius: var(--border-radius);
}

.tab {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  background: transparent;
  border-radius: calc(var(--border-radius) - var(--spacing-xs));
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: var(--font-weight-semibold);
  transition: var(--transition);
  color: var(--text-secondary);
}

.tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.5);
}

.tab.active {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

/* ===== FORMS ===== */
.form-section {
  display: none;
}

.form-section.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-group label svg {
  width: 16px;
  height: 16px;
  stroke: var(--gray-500);
}

.form-group input,
.form-group select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: var(--font-sans);
  transition: var(--transition);
  background: var(--bg-card);
  color: var(--text-primary);
}

.form-group input:hover,
.form-group select:hover {
  border-color: var(--gray-300);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-group input.error {
  border-color: var(--danger);
}

.form-group input.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group select {
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
}

.error-message {
  color: var(--danger);
  font-size: 0.8125rem;
  margin-top: var(--spacing-xs);
  display: none;
  align-items: center;
  gap: var(--spacing-xs);
}

.error-message svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.error-message.show {
  display: flex;
}

/* ===== PIN INPUT ===== */
.pin-input-group {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.pin-digit {
  width: 56px;
  height: 56px;
  text-align: center;
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: var(--transition);
  background: var(--bg-card);
}

.pin-digit:hover {
  border-color: var(--gray-300);
}

.pin-digit:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* ===== BUTTONS ===== */
.btn {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: var(--transition);
  margin-top: var(--spacing-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.btn svg {
  width: 20px;
  height: 20px;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

/* ===== INFO TEXT ===== */
.info-text {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background: var(--gray-50);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.info-text svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke: var(--info);
}

/* ===== TERMS DISCLAIMER ===== */
.terms-disclaimer {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--gray-50);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.checkbox-label + .checkbox-label {
  margin-top: var(--spacing-sm);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--primary);
  flex-shrink: 0;
  cursor: pointer;
}

.checkbox-label a {
  color: var(--primary);
  text-decoration: underline;
  font-weight: 500;
}

.checkbox-label a:hover {
  color: var(--primary-hover);
}

.terms-disclaimer .error-message {
  margin-top: var(--spacing-sm);
}

/* ===== ALERTS ===== */
#alertContainer {
  margin-bottom: var(--spacing-lg);
}

.alert {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  display: none;
  animation: slideDown 0.3s ease;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

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

.alert svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.alert.show {
  display: flex;
}

.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-error svg {
  stroke: #dc2626;
}

.alert-success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #86efac;
}

.alert-success svg {
  stroke: #16a34a;
}

/* ===== LOADING ===== */
.loading {
  display: none;
  text-align: center;
  padding: var(--spacing-xl);
}

.loading.show {
  display: block;
}

.spinner {
  border: 3px solid var(--gray-200);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--spacing-md);
}

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

.loading p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
  /* Touch targets para móvil */
  button, a, .tab, .btn {
    min-height: 44px;
  }
  
  body {
    padding: var(--spacing-md);
  }
  
  .auth-container {
    max-width: 100%;
  }
  
  .auth-header {
    padding: var(--spacing-xl);
  }
  
  .auth-header h1 {
    font-size: 1.5rem;
  }
  
  .auth-body {
    padding: var(--spacing-lg);
  }
  
  .tabs {
    gap: var(--spacing-sm);
  }
  
  .tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
  }
  
  .pin-digit {
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
  }
  
  .pin-input-group {
    gap: var(--spacing-sm);
  }
  
  /* Prevent iOS zoom on input focus */
  .form-group input,
  .form-group select {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  body {
    padding: var(--spacing-sm);
  }
  
  .auth-container {
    border-radius: var(--border-radius);
  }
  
  .auth-header {
    padding: var(--spacing-lg);
  }
  
  .auth-header h1 {
    font-size: 1.25rem;
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .logo-icon {
    width: 48px;
    height: 48px;
  }
  
  .auth-header p {
    font-size: 0.875rem;
  }
  
  .auth-body {
    padding: var(--spacing-md);
  }
  
  .tabs {
    gap: var(--spacing-xs);
  }
  
  .tab {
    padding: var(--spacing-sm);
    font-size: 0.8rem;
  }
  
  .form-group {
    margin-bottom: var(--spacing-md);
  }
  
  .form-group label {
    font-size: 0.8rem;
    margin-bottom: var(--spacing-xs);
  }
  
  .form-group input {
    padding: 12px;
    font-size: 16px; /* Evita zoom en iOS */
  }
  
  .btn-primary {
    padding: 14px;
    font-size: 0.9rem;
  }
  
  .pin-digit {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
  
  .pin-input-group {
    gap: 6px;
  }
  
  .pin-buttons {
    gap: var(--spacing-xs);
  }
  
  .pin-buttons button {
    padding: 10px 16px;
    font-size: 0.8rem;
  }
  
  /* Social buttons */
  .btn-social {
    padding: 12px;
    font-size: 0.85rem;
  }
  
  /* Divider */
  .divider {
    margin: var(--spacing-md) 0;
    font-size: 0.75rem;
  }
  
  /* Error messages */
  .error-message {
    font-size: 0.75rem;
  }
  
  /* Loading */
  .loading p {
    font-size: 0.85rem;
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ===== UTILITIES ===== */
.text-center {
  text-align: center;
}

.mt-4 {
  margin-top: var(--spacing-lg);
}

.mb-4 {
  margin-bottom: var(--spacing-lg);
}

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

/* Logo icon con animación de respiración */
.logo-icon {
  animation: breathe 3s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* Tabs con transición suave */
.tab {
  transition: all 0.3s ease;
}

.tab:hover:not(.active) {
  background: var(--bg-hover);
}

.tab.active {
  transition: color 0.3s ease;
}

/* Form groups con animación de entrada */
.form-group {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Input focus mejorado */
input:focus {
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 0 0 3px rgba(26, 95, 122, 0.15);
}

/* Botón primario con hover animado */
.btn-primary {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 95, 122, 0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Spinner de loading */
.spinner {
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Alerts con animación de entrada */
.alert {
  animation: alertSlide 0.4s ease-out;
}

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

/* Social button hover */
.btn-social {
  transition: all 0.3s ease;
}

.btn-social:hover {
  transform: translateY(-1px);
}

/* ===================================
   TRIAL MODAL - 7 Days Free
   =================================== */
.trial-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-lg);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.trial-modal.active {
  opacity: 1;
  visibility: visible;
}

.trial-modal-content {
  background: var(--bg-card);
  border-radius: var(--border-radius-lg);
  max-width: 420px;
  width: 100%;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.trial-modal.active .trial-modal-content {
  transform: scale(1);
}

.trial-modal-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: white;
  padding: var(--spacing-xl);
  text-align: center;
}

.trial-icon {
  width: 64px;
  height: 64px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
}

.trial-icon svg {
  width: 32px;
  height: 32px;
  stroke: white;
  fill: rgba(255, 255, 255, 0.3);
}

.trial-modal-header h2 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  margin: 0;
}

.trial-modal-body {
  padding: var(--spacing-xl);
  text-align: center;
}

.trial-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(135deg, var(--success) 0%, #3db582 100%);
  color: white;
  padding: var(--spacing-lg) var(--spacing-2xl);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 4px 15px rgba(87, 204, 153, 0.4);
}

.trial-days {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

.trial-text {
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.trial-description {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.trial-description strong {
  color: var(--primary);
}

.trial-benefits {
  list-style: none;
  text-align: left;
  margin: 0;
  padding: 0;
}

.trial-benefits li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.trial-benefits li svg {
  width: 20px;
  height: 20px;
  stroke: var(--success);
  flex-shrink: 0;
}

.trial-modal-footer {
  padding: 0 var(--spacing-xl) var(--spacing-xl);
}

.trial-modal-footer .btn {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1rem;
  gap: var(--spacing-sm);
}

.trial-modal-footer .btn svg {
  width: 20px;
  height: 20px;
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .trial-modal-content {
    max-width: 100%;
  }
  
  .trial-days {
    font-size: 2.5rem;
  }
  
  .trial-modal-header,
  .trial-modal-body,
  .trial-modal-footer {
    padding: var(--spacing-lg);
  }
}