/* Estilo sobrio: fondo oscuro neutro con un solo acento verde azulado. */
:root {
  --color_background: #0f1720;
  --color_background_glow: #14303a;
  --color_card: #17212c;
  --color_card_edge: #263443;
  /* Borde de los controles (campos y botones): más claro que el de la tarjeta para que se distingan bien */
  --color_control_edge: #6a8094;
  --color_field: #0f1720;
  --color_text: #e8eef4;
  --color_text_muted: #9fb0c0;
  --color_accent: #2dd4bf;
  --color_accent_strong: #5eead4;
  --color_on_accent: #04201c;
  --color_focus: #ffb020;
  --color_digit: #7dd3fc;
  --color_symbol: #fbbf77;
  --color_notice: #fbbf77;
  --color_strength_empty: #2b3a4a;
  --color_strength_weak: #f87171;
  --color_strength_fair: #fbbf24;
  --color_strength_strong: #4ade80;
  --color_strength_very_strong: #2dd4bf;
  --radius: 16px;
  --font_ui: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font_code: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

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

/* El atributo hidden siempre gana, aunque otra regla defina display */
[hidden] {
  display: none !important;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font_ui);
  line-height: 1.5;
  color: var(--color_text);
  background:
    radial-gradient(circle at 20% 10%, var(--color_background_glow), transparent 45%),
    var(--color_background);
}

/* Lienzo 3D de fondo: decorativo, nunca recibe toques */
#scene_canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.skip_link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 20;
  padding: 10px 16px;
  border-radius: 10px;
  color: var(--color_on_accent);
  background: var(--color_accent);
  text-decoration: none;
}

.skip_link:focus {
  top: 16px;
}

/* Texto solo para lectores de pantalla */
.visually_hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.card {
  width: 100%;
  max-width: 480px;
  padding: 24px 20px 20px;
  background: var(--color_card);
  border: 1px solid var(--color_card_edge);
  border-radius: var(--radius);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.card_header {
  margin-bottom: 20px;
  text-align: center;
}

.page_title {
  font-size: clamp(1.15rem, 5.2vw, 1.7rem);
  line-height: 1.25;
}

.page_title .fa-lock {
  margin-right: 6px;
  color: var(--color_accent);
}

.page_subtitle {
  margin-top: 4px;
  font-size: 0.95rem;
  color: var(--color_text_muted);
}

/* Resultado */
.result {
  margin-bottom: 22px;
}

.password_output {
  min-height: 3.2em;
  display: flex;
  align-items: center;
  padding: 14px 16px;
  font-family: var(--font_code);
  font-size: clamp(1.15rem, 5.4vw, 1.5rem);
  line-height: 1.5;
  letter-spacing: 0.04em;
  /* Un toque selecciona toda la contraseña, para copiarla a mano si hiciera falta */
  user-select: all;
  -webkit-user-select: all;
  overflow-wrap: anywhere;
  word-break: break-all;
  background: var(--color_field);
  border: 1.5px solid var(--color_control_edge);
  border-radius: 12px;
}

/* Números y símbolos en otro color para distinguir caracteres parecidos */
.char_digit {
  color: var(--color_digit);
}

.char_symbol {
  color: var(--color_symbol);
}

.result_actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.button {
  flex: 1 1 130px;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid transparent;
  border-radius: 12px;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

.button:active {
  transform: scale(0.98);
}

.button_primary {
  color: var(--color_on_accent);
  background: var(--color_accent);
}

.button_primary:hover {
  background: var(--color_accent_strong);
}

.button_secondary {
  color: var(--color_text);
  background: transparent;
  border-color: var(--color_control_edge);
}

.button_secondary:hover {
  border-color: var(--color_accent);
}

/* Foco siempre visible con teclado */
.button:focus-visible,
.length_input:focus-visible,
.length_slider:focus-visible,
.option input:focus-visible,
.password_output:focus-visible,
.skip_link:focus-visible {
  outline: 3px solid var(--color_focus);
  outline-offset: 2px;
}

/* Fortaleza: cuatro segmentos que se llenan según el nivel (data-level de 0 a 4) */
.strength {
  --strength_color: var(--color_strength_empty);
  margin-top: 16px;
}

.strength[data-level="1"] {
  --strength_color: var(--color_strength_weak);
}

.strength[data-level="2"] {
  --strength_color: var(--color_strength_fair);
}

.strength[data-level="3"] {
  --strength_color: var(--color_strength_strong);
}

.strength[data-level="4"] {
  --strength_color: var(--color_strength_very_strong);
}

.strength_bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.strength_bar span {
  height: 8px;
  background: var(--color_strength_empty);
  border-radius: 4px;
  transition: background-color 0.25s ease;
}

.strength[data-level="1"] .strength_bar span:nth-child(-n + 1),
.strength[data-level="2"] .strength_bar span:nth-child(-n + 2),
.strength[data-level="3"] .strength_bar span:nth-child(-n + 3),
.strength[data-level="4"] .strength_bar span:nth-child(-n + 4) {
  background: var(--strength_color);
}

.strength_text {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  font-size: 0.9rem;
}

.strength_label {
  font-weight: 700;
  color: var(--strength_color);
}

.strength[data-level="0"] .strength_label {
  color: var(--color_text_muted);
}

.strength_bits {
  color: var(--color_text_muted);
}

/* Opciones */
.options {
  padding-top: 20px;
  border-top: 1px solid var(--color_card_edge);
}

.length_group {
  margin-bottom: 18px;
}

.length_header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

label,
legend {
  font-size: 0.95rem;
  font-weight: 600;
}

.length_input {
  width: 84px;
  min-height: 44px;
  padding: 6px 10px;
  font: inherit;
  /* 16px evita que iOS haga zoom al enfocar el campo */
  font-size: 1rem;
  text-align: center;
  color: var(--color_text);
  background: var(--color_field);
  border: 1.5px solid var(--color_control_edge);
  border-radius: 10px;
}

.length_slider {
  width: 100%;
  min-height: 32px;
  accent-color: var(--color_accent);
  cursor: pointer;
}

.types {
  margin-bottom: 4px;
  border: 0;
}

.types legend {
  margin-bottom: 4px;
}

/* Cada opción mide al menos 48 px de alto para tocarla con el dedo */
.option {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  font-weight: 400;
  cursor: pointer;
}

.option input {
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  accent-color: var(--color_accent);
  cursor: pointer;
}

.option_text {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  column-gap: 10px;
}

.option_example {
  font-family: var(--font_code);
  font-size: 0.85rem;
  color: var(--color_text_muted);
}

/* "Evitar confusos" es distinto de los tipos de caracteres: va aparte */
.option_apart {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--color_card_edge);
}

.notice {
  margin-top: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color_notice);
  background: rgba(251, 191, 119, 0.1);
  border-left: 4px solid var(--color_notice);
  border-radius: 8px;
}

.privacy_note {
  margin-top: 18px;
  font-size: 0.85rem;
  text-align: center;
  color: var(--color_text_muted);
}

.privacy_note .fa-shield-halved {
  margin-right: 4px;
  color: var(--color_accent);
}

/* Pantallas bajas (portátiles, celulares): menos aire para que todo entre sin desplazarse de más */
@media (max-height: 880px) {
  .page {
    padding-block: 12px;
  }

  .card {
    padding-block: 16px 14px;
  }

  .card_header {
    margin-bottom: 12px;
  }

  .result {
    margin-bottom: 14px;
  }

  .options {
    padding-top: 12px;
  }

  .length_group {
    margin-bottom: 8px;
  }

  .option {
    min-height: 44px;
  }

  .privacy_note {
    margin-top: 10px;
  }
}

/* Movimiento reducido: sin transiciones */
@media (prefers-reduced-motion: reduce) {
  .button,
  .strength_bar span {
    transition: none;
  }

  .button:active {
    transform: none;
  }
}

/* Derechos de autor: una línea discreta al pie de la tarjeta */
.copyright {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.4;
  text-align: center;
  color: var(--color_text_muted);
}