/* ==========================================================================
   Generador de Contraseñas Seguras
   Estilos CSS3 Nativos - Paleta de colores fríos y azules
   ========================================================================== */

/* 1. Reset & Variables
   -------------------------------------------------------------------------- */
:root {
  /* Medida base: 1rem = 10px */
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", "Courier New", monospace;

  /* Colores Principales (Azules y Fríos) */
  --color-primary: #0284c7;        /* Sky 600 */
  --color-primary-hover: #0369a1;  /* Sky 700 */
  --color-primary-light: #e0f2fe;  /* Sky 100 */
  --color-primary-glow: rgba(2, 132, 199, 0.25);

  --color-secondary: #0284c7;
  --color-accent: #38bdf8;         /* Sky 400 */
  --color-ice-blue: #f0f9ff;       /* Sky 50 */

  /* Neutrales Fríos (Slate) */
  --color-bg: #f1f5f9;            /* Slate 100 */
  --color-bg-card: #ffffff;
  --color-border: #cbd5e1;        /* Slate 300 */
  --color-border-subtle: #e2e8f0; /* Slate 200 */
  --color-border-focus: #0284c7;
  
  --color-text-main: #0f172a;     /* Slate 900 */
  --color-text-body: #334155;     /* Slate 700 */
  --color-text-muted: #64748b;    /* Slate 500 */
  --color-text-light: #94a3b8;    /* Slate 400 */

  /* Fortaleza */
  --color-strength-1: #ef4444;    /* Débil - Rojo suave */
  --color-strength-2: #f59e0b;    /* Regular - Ámbar */
  --color-strength-3: #0284c7;    /* Fuerte - Azul Sky */
  --color-strength-4: #059669;    /* Muy fuerte - Esmeralda */
  --color-strength-empty: #e2e8f0;

  /* Sombras y Elevación */
  --shadow-sm: 0 0.2rem 0.6rem rgba(15, 23, 42, 0.04);
  --shadow-md: 0 0.8rem 2rem -0.4rem rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 2rem 3.5rem -0.8rem rgba(2, 132, 199, 0.12), 0 1rem 1.5rem -0.6rem rgba(15, 23, 42, 0.05);
  --shadow-focus: 0 0 0 0.35rem var(--color-primary-glow);

  /* Bordes y Transiciones */
  --radius-sm: 0.6rem;
  --radius-md: 1.2rem;
  --radius-lg: 1.8rem;
  --radius-full: 999.9rem;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

html {
  font-size: 62.5%; /* 1rem = 10px */
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-size: 1.6rem;
  line-height: 1.5;
  color: var(--color-text-body);
  background: var(--color-bg);
  background-image: 
    radial-gradient(circle at 15% 15%, #e0f2fe 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, #e2e8f0 0%, transparent 45%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  padding: 3rem 1.6rem;
}

/* 2. Layout Principal
   -------------------------------------------------------------------------- */
.page-wrapper {
  width: 100%;
  max-width: 68rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.8rem;
}

/* Header */
.main-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 1.4rem;
}

.brand-icon-wrapper {
  width: 5.2rem;
  height: 5.2rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary) 0%, #0369a1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 0.8rem 1.6rem var(--color-primary-glow);
  flex-shrink: 0;
}

.brand-icon {
  width: 2.8rem;
  height: 2.8rem;
}

.brand-text {
  text-align: left;
}

.brand-tag {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12rem;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-full);
}

.brand-title {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.05rem;
  line-height: 1.2;
}

.brand-description {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  max-width: 52rem;
  margin: 0 auto;
}

/* 3. Tarjeta del Generador
   -------------------------------------------------------------------------- */
.generator-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 0.1rem solid var(--color-border-subtle);
  box-shadow: var(--shadow-lg);
  padding: 2.8rem;
  display: flex;
  flex-direction: column;
  gap: 2.4rem;
  transition: transform var(--transition-normal);
}

/* Visualizador de Contraseña */
.display-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--color-ice-blue);
  border: 0.2rem solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 0.8rem 1.2rem;
  box-shadow: inset 0 0.2rem 0.4rem rgba(2, 132, 199, 0.05);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.display-container:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.display-input-wrap {
  flex: 1;
  min-width: 0;
}

.password-field {
  width: 100%;
  border: none;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 600;
  color: var(--color-text-main);
  letter-spacing: 0.15rem;
  padding: 0.6rem 0.4rem;
  outline: none;
  cursor: text;
  user-select: all;
  text-overflow: ellipsis;
  overflow: hidden;
}

.password-field.masked {
  letter-spacing: 0.35rem;
  font-family: caption, var(--font-mono);
}

.display-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

/* Botones de acción */
.action-button {
  position: relative;
  width: 4.2rem;
  height: 4.2rem;
  border-radius: var(--radius-sm);
  border: 0.1rem solid transparent;
  background-color: #ffffff;
  color: var(--color-text-body);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.action-button svg {
  width: 2rem;
  height: 2rem;
  transition: transform var(--transition-fast);
}

.action-button:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: #bae6fd;
}

.action-button:active {
  transform: scale(0.94);
}

.action-button:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.action-button-copy {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 0.4rem 1rem var(--color-primary-glow);
}

.action-button-copy:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
}

.action-button-copy.copied {
  background-color: var(--color-strength-4);
  color: #ffffff;
  box-shadow: 0 0.4rem 1rem rgba(5, 150, 105, 0.3);
}

/* Tooltip nativo CSS */
.action-tooltip {
  position: absolute;
  bottom: calc(100% + 0.8rem);
  left: 50%;
  transform: translateX(-50%) translateY(0.4rem);
  background-color: var(--color-text-main);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: all var(--transition-fast);
  z-index: 10;
}

.action-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 0.4rem;
  border-style: solid;
  border-color: var(--color-text-main) transparent transparent transparent;
}

.action-button:hover .action-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Animación de rotación al regenerar */
.rotate-anim {
  animation: spin 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* 4. Indicador de Fortaleza
   -------------------------------------------------------------------------- */
.strength-meter-box {
  background-color: #f8fafc;
  border: 0.1rem solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.strength-label {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05rem;
}

.strength-value {
  font-size: 1.4rem;
  font-weight: 700;
  transition: color var(--transition-normal);
}

.strength-value.strength-1 { color: var(--color-strength-1); }
.strength-value.strength-2 { color: var(--color-strength-2); }
.strength-value.strength-3 { color: var(--color-strength-3); }
.strength-value.strength-4 { color: var(--color-strength-4); }

.strength-bars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  height: 0.7rem;
}

.strength-segment {
  background-color: var(--color-strength-empty);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.strength-segment.active-1 {
  background-color: var(--color-strength-1);
}
.strength-segment.active-2 {
  background-color: var(--color-strength-2);
}
.strength-segment.active-3 {
  background-color: var(--color-strength-3);
  box-shadow: 0 0 0.8rem var(--color-primary-glow);
}
.strength-segment.active-4 {
  background-color: var(--color-strength-4);
  box-shadow: 0 0 0.8rem rgba(5, 150, 105, 0.35);
}

.strength-hint {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* 5. Controles del Formulario
   -------------------------------------------------------------------------- */
.options-form {
  display: flex;
  flex-direction: column;
  gap: 2.2rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.control-label {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-main);
}

/* Control Slider */
.length-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.length-badge {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  background-color: var(--color-primary-light);
  border: 0.1rem solid #bae6fd;
  color: var(--color-primary);
  padding: 0.3rem 1.2rem;
  border-radius: var(--radius-full);
}

.length-number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.length-unit {
  font-size: 1.2rem;
  font-weight: 600;
}

.slider-wrapper {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.slider-bound {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-muted);
  min-width: 1.8rem;
  text-align: center;
}

.length-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 0.8rem;
  border-radius: var(--radius-full);
  background: #e2e8f0;
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

/* Rango Webkit */
.length-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  background: var(--color-primary);
  border: 0.3rem solid #ffffff;
  box-shadow: 0 0.2rem 0.6rem rgba(2, 132, 199, 0.4);
  cursor: grab;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.length-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background-color: var(--color-primary-hover);
}

.length-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.05);
}

/* Rango Firefox */
.length-slider::-moz-range-thumb {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  background: var(--color-primary);
  border: 0.3rem solid #ffffff;
  box-shadow: 0 0.2rem 0.6rem rgba(2, 132, 199, 0.4);
  cursor: grab;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.length-slider::-moz-range-thumb:hover {
  transform: scale(1.15);
}

.length-slider:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Opciones de caracteres (Fieldset & Checkboxes) */
.options-fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.checkboxes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.custom-checkbox {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.4rem;
  background-color: #f8fafc;
  border: 0.15rem solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
}

.custom-checkbox:hover {
  border-color: #bae6fd;
  background-color: var(--color-ice-blue);
}

.custom-checkbox:has(input:checked) {
  border-color: #7dd3fc;
  background-color: #f0f9ff;
}

.custom-checkbox:has(input:focus-visible) {
  box-shadow: var(--shadow-focus);
}

/* Ocultar checkbox nativo pero mantener accesibilidad */
.custom-checkbox input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-box {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.5rem;
  border: 0.2rem solid var(--color-border);
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.checkbox-box svg {
  width: 1.4rem;
  height: 1.4rem;
  color: #ffffff;
  opacity: 0;
  transform: scale(0.6);
  transition: all var(--transition-fast);
}

.custom-checkbox input[type="checkbox"]:checked + .checkbox-box {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.custom-checkbox input[type="checkbox"]:checked + .checkbox-box svg {
  opacity: 1;
  transform: scale(1);
}

.checkbox-content {
  display: flex;
  flex-direction: column;
}

.checkbox-title {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.2;
}

.checkbox-preview {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* Botón principal */
.form-submit-group {
  margin-top: 0.6rem;
}

.btn-primary {
  width: 100%;
  padding: 1.4rem 2.4rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0369a1 100%);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.02rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  box-shadow: 0 0.8rem 1.8rem var(--color-primary-glow);
  transition: all var(--transition-normal);
}

.btn-primary-icon {
  width: 2rem;
  height: 2rem;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0284c7 0%, #075985 100%);
  transform: translateY(-0.15rem);
  box-shadow: 0 1.2rem 2.4rem var(--color-primary-glow);
}

.btn-primary:active {
  transform: translateY(0.1rem);
}

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

/* 6. Sección Informativa
   -------------------------------------------------------------------------- */
.info-section {
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
  margin-top: 0.8rem;
}

.info-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-text-main);
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}

.feature-card {
  background-color: #ffffff;
  border: 0.1rem solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.feature-card:hover {
  border-color: #bae6fd;
  transform: translateY(-0.2rem);
}

.feature-icon {
  width: 4rem;
  height: 4rem;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 2.2rem;
  height: 2.2rem;
}

.feature-name {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.feature-desc {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.45;
}

/* 7. Footer
   -------------------------------------------------------------------------- */
.main-footer {
  text-align: center;
  padding: 1rem 0 2rem;
}

.footer-copy {
  font-size: 1.25rem;
  color: var(--color-text-light);
}

/* 8. Toast Notifications (Sin alert/prompt/confirm)
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 2.4rem;
  right: 2.4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--color-text-main);
  color: #ffffff;
  padding: 1.2rem 1.8rem;
  border-radius: var(--radius-md);
  box-shadow: 0 1rem 2.5rem rgba(15, 23, 42, 0.25);
  font-size: 1.4rem;
  font-weight: 500;
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast.toast-warning {
  background-color: #854d0e;
  border-left: 0.4rem solid #facc15;
}

.toast.toast-success {
  background-color: #064e3b;
  border-left: 0.4rem solid #34d399;
}

.toast-icon {
  width: 1.8rem;
  height: 1.8rem;
  flex-shrink: 0;
}

.toast.toast-fade-out {
  opacity: 0;
  transform: translateY(1rem) scale(0.95);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(1.5rem) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Utilidades */
.is-hidden {
  display: none !important;
}

/* 9. Responsive Queries
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  body {
    padding: 1.6rem 1.2rem;
  }

  .generator-card {
    padding: 2rem 1.6rem;
    gap: 2rem;
  }

  .brand-title {
    font-size: 2.2rem;
  }

  .password-field {
    font-size: 1.8rem;
  }

  .checkboxes-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .toast-container {
    left: 1.2rem;
    right: 1.2rem;
    bottom: 1.6rem;
  }
}