/* ==========================================================================
   Letra Aleatoria — hoja de estilos principal
   Diseño: A02 — Tool First Conversion
   ========================================================================== */

/* ---------- Variables ---------- */
:root {
  --primary: #5B5FEF;
  --primary-dark: #4145C7;
  --secondary: #8B5CF6;
  --accent: #F59E0B;
  --heading: #172033;
  --text: #4B5565;
  --muted: #6B7280;
  --background: #F7F8FC;
  --surface: #FFFFFF;
  --surface-soft: #F0F1FF;
  --border: #DFE3EE;
  --success: #168A57;
  --error: #C63D4F;
  --footer: #111827;

  --grad: linear-gradient(135deg, #5B5FEF 0%, #8B5CF6 100%);

  --font: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;

  --fs-h1: clamp(2.25rem, 5vw, 4.25rem);
  --fs-h2: clamp(1.8rem, 3.5vw, 2.8rem);
  --fs-h3: clamp(1.15rem, 2vw, 1.4rem);
  --fs-body: clamp(0.96rem, 1.2vw, 1.05rem);
  --fs-small: 0.875rem;

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 3px rgba(23, 32, 51, 0.07);
  --shadow: 0 8px 24px rgba(58, 62, 158, 0.10);
  --shadow-lg: 0 18px 48px rgba(58, 62, 158, 0.16);

  --container: 1140px;
  --header-h: 72px;

  --transition: 0.22s ease;
}

/* ---------- Reset básico ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text);
  background: var(--background);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
  color: var(--heading);
  line-height: 1.2;
  margin: 0 0 var(--space-3);
  overflow-wrap: break-word;
}
h1 { font-size: var(--fs-h1); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: var(--fs-h2); font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: var(--fs-h3); font-weight: 600; }

p { margin: 0 0 var(--space-3); overflow-wrap: break-word; }
p:last-child { margin-bottom: 0; }

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

ul, ol { padding-left: 1.35rem; margin: 0 0 var(--space-3); }
li { margin-bottom: 0.4rem; }

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Utilidades ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 1.5rem);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -60px; left: 12px;
  z-index: 200;
  background: var(--primary-dark);
  color: #fff;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: 12px; color: #fff; }

.section { padding-block: clamp(3rem, 7vw, 4.75rem); }
.section-alt { background: var(--surface); }

.section-head { max-width: 720px; margin: 0 auto var(--space-6); text-align: center; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.9rem;
  margin-bottom: var(--space-3);
}
.section-head p { color: var(--muted); }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 48px;
  padding: 0.75rem 1.6rem;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  text-align: center;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
}
.btn svg { flex: 0 0 auto; }
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 10px 24px rgba(91, 95, 239, 0.35);
}
.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #4145C7 0%, #7C4DE8 100%);
  color: #fff;
  box-shadow: 0 12px 28px rgba(65, 69, 199, 0.42);
}

.btn-secondary {
  background: var(--surface);
  color: var(--primary-dark);
  border-color: var(--primary);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--surface-soft);
  color: var(--primary-dark);
}

.btn-ghost {
  background: var(--surface-soft);
  color: var(--heading);
  border-color: var(--border);
}
.btn-ghost:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary-dark);
}

.btn-lg { min-height: 56px; padding: 0.95rem 2.1rem; font-size: 1.08rem; }
.btn-sm { min-height: 44px; padding: 0.5rem 1.1rem; font-size: 0.92rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.site-header.is-scrolled {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--header-h);
  max-width: 1360px;
}
.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}
.brand img { width: 218px; height: 40px; max-width: none; }

.main-nav { margin-left: auto; }
.main-nav ul {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.4rem);
  list-style: none;
  margin: 0;
  padding: 0;
}
.main-nav li {
  flex: 0 0 auto;
  margin-bottom: 0;
}
.main-nav a {
  display: inline-block;
  padding: 0.55rem 0.35rem;
  color: var(--heading);
  font-weight: 500;
  font-size: 0.95rem;
  white-space: nowrap;
  word-break: normal;
  overflow-wrap: normal;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover { color: var(--primary); }
.main-nav a.is-active {
  color: var(--primary-dark);
  border-bottom-color: var(--primary);
  font-weight: 600;
}
.header-cta { flex: 0 0 auto; }

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  color: var(--heading);
}

@media (max-width: 1180px) {
  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4);
    margin: 0;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 0.2rem; }
  .main-nav a {
    display: block;
    padding: 0.85rem 0.75rem;
    border-radius: var(--radius-sm);
    border-bottom: none;
    font-size: 1.02rem;
  }
  .main-nav a.is-active { background: var(--surface-soft); }
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }
}
@media (max-width: 480px) {
  .brand img { width: 188px; height: 34px; max-width: none; }
}

body.menu-open { overflow: hidden; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  text-align: center;
  padding-block: clamp(3rem, 7vw, 5rem) clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(900px 420px at 50% -180px, rgba(91, 95, 239, 0.14), transparent 70%),
    var(--background);
  overflow: hidden;
}
.hero-tagline {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--primary-dark);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.4rem 1rem;
  margin-bottom: var(--space-4);
}
.hero h1 { max-width: 880px; margin-inline: auto; }
.hero h1 .grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  max-width: 660px;
  margin: 0 auto var(--space-5);
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.13rem);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.trust-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2) var(--space-4);
  list-style: none;
  margin: 0 0 var(--space-5);
  padding: 0;
}
.trust-badges li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--heading);
  margin: 0;
}
.trust-badges svg { color: var(--success); }
.hero-visual {
  max-width: 980px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.hero-visual img { width: 100%; height: auto; }
@media (max-width: 600px) {
  .hero-visual { display: none; }
  .hero-actions .btn { width: 100%; }
}

/* ---------- Herramienta ---------- */
.tool-section { padding-block: clamp(2rem, 5vw, 3.5rem) clamp(3rem, 7vw, 4.5rem); }
.tool-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: clamp(1.25rem, 3.5vw, 2.5rem);
}
.tool-head { text-align: center; max-width: 640px; margin: 0 auto var(--space-5); }
.tool-head p { color: var(--muted); }

.tool-grid {
  display: grid;
  grid-template-columns: minmax(300px, 430px) 1fr;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
}

.tool-settings {
  display: grid;
  gap: var(--space-4);
}
.tool-settings fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-3) var(--space-3);
  margin: 0;
  background: var(--surface);
}
.tool-settings legend {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--heading);
  padding-inline: 0.4rem;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}
.choice {
  position: relative;
  display: flex;
}
.choice input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}
.choice span {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.45rem 0.6rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--heading);
  text-align: center;
  background: var(--surface);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.choice input:checked + span {
  border-color: var(--primary);
  background: var(--surface-soft);
  color: var(--primary-dark);
  font-weight: 600;
}
.choice input:focus-visible + span {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.field { margin: 0; }
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--heading);
  margin-bottom: 0.4rem;
}
.field .hint {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.35rem;
}
.field input[type="text"] {
  width: 100%;
  min-height: 48px;
  padding: 0.6rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 1rem;
  color: var(--heading);
  background: var(--surface);
  transition: border-color var(--transition);
}
.field input[type="text"]:focus {
  border-color: var(--primary);
  outline: 3px solid rgba(91, 95, 239, 0.25);
  outline-offset: 0;
}

.qty-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.qty-btn {
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--primary-dark);
  font-size: 1.3rem;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.qty-btn:hover { border-color: var(--primary); }
.qty-row input[type="number"] {
  width: 100%;
  min-height: 46px;
  text-align: center;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--heading);
  -moz-appearance: textfield;
  appearance: textfield;
}
.qty-row input[type="number"]::-webkit-outer-spin-button,
.qty-row input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.qty-row input[type="number"]:focus {
  border-color: var(--primary);
  outline: 3px solid rgba(91, 95, 239, 0.25);
}

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 0.3rem 0;
}
.switch-row + .switch-row { border-top: 1px dashed var(--border); margin-top: 0.35rem; padding-top: 0.7rem; }
.switch-label { font-weight: 500; font-size: 0.93rem; color: var(--heading); }
.switch {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
}
.switch input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}
.switch .track {
  width: 52px;
  height: 30px;
  border-radius: var(--radius-pill);
  background: var(--border);
  transition: background var(--transition);
  position: relative;
}
.switch .track::after {
  content: "";
  position: absolute;
  top: 3px; left: 3px;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}
.switch input:checked + .track { background: var(--primary); }
.switch input:checked + .track::after { transform: translateX(22px); }
.switch input:focus-visible + .track {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Resultado */
.tool-result-col {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}
.result-card {
  position: relative;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  text-align: center;
  background:
    radial-gradient(420px 220px at 50% 0%, rgba(139, 92, 246, 0.10), transparent 70%),
    var(--surface-soft);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-4);
  overflow: hidden;
}
.result-empty {
  color: var(--muted);
  font-size: 1.05rem;
  font-weight: 500;
  display: grid;
  justify-items: center;
  gap: var(--space-2);
}
.result-empty svg { color: var(--primary); opacity: 0.6; }
.result-letters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(0.5rem, 1.5vw, 0.9rem);
  max-width: 100%;
}
.result-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: clamp(3.4rem, 9vw, 5.4rem);
  min-height: clamp(3.4rem, 9vw, 5.4rem);
  padding: 0.2em 0.35em;
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 800;
  color: var(--primary-dark);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: pop-in 0.35s ease both;
}
.result-letter.is-single {
  min-width: clamp(6rem, 18vw, 9.5rem);
  min-height: clamp(6rem, 18vw, 9.5rem);
  font-size: clamp(3.6rem, 12vw, 6.5rem);
}
@keyframes pop-in {
  0% { opacity: 0; transform: scale(0.6) translateY(10px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

.tool-status {
  min-height: 1.4rem;
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
  text-align: center;
}
.tool-status.is-error { color: var(--error); }
.tool-status.is-success { color: var(--success); }

.tool-actions-main { display: grid; gap: var(--space-2); }
.tool-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}
.shortcuts {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}
.shortcuts kbd {
  display: inline-block;
  font-family: var(--font);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--heading);
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0.1rem 0.42rem;
}

/* Historial */
.history-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
}
.history-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}
.history-head h3 { margin: 0; font-size: 1rem; }
.history-empty { color: var(--muted); font-size: 0.9rem; margin: 0.3rem 0; }
.history-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
.history-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.5rem 0.4rem 0.8rem;
  margin: 0;
}
.history-value {
  font-weight: 600;
  color: var(--heading);
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}
.history-copy {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--primary-dark);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.history-copy:hover { border-color: var(--primary); }

@media (max-width: 900px) {
  .tool-grid { grid-template-columns: 1fr; }
  .tool-actions-main { order: -1; }
  .tool-result-col { order: 0; }
}
@media (max-width: 480px) {
  .choice-grid { grid-template-columns: 1fr 1fr; }
  .tool-actions .btn { flex: 1 1 46%; }
  .shortcuts { word-break: break-word; }
}

/* Evita desbordes horizontales: las columnas de la rejilla pueden encogerse
   por debajo de su contenido y los campos nunca superan su contenedor. */
.tool-grid > * { min-width: 0; }
.tool-settings, .tool-result-col { min-width: 0; }
.tool-settings fieldset { min-width: 0; }
.field input, .field, .choice { min-width: 0; max-width: 100%; }
.result-card { overflow-wrap: break-word; }

/* ---------- Beneficios rápidos ---------- */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
.benefit {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
}
.benefit-icon {
  flex: 0 0 auto;
  width: 44px; height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--primary-dark);
}
.benefit p { margin: 0; font-weight: 600; color: var(--heading); font-size: 0.95rem; }
@media (max-width: 992px) { .benefits-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .benefits-grid { grid-template-columns: 1fr; } }

/* ---------- Ejemplos ---------- */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.example-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.example-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.example-value {
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  font-weight: 700;
  color: var(--primary-dark);
  background: var(--surface-soft);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-2);
  overflow-wrap: anywhere;
}
.example-note { font-size: 0.85rem; color: var(--muted); margin: 0; }
.examples-cta { text-align: center; }
@media (max-width: 992px) { .examples-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .examples-grid { grid-template-columns: 1fr; } }

/* ---------- Cómo funciona ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
.step-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.step-num {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--surface-soft);
  -webkit-text-stroke: 1.5px var(--primary);
  line-height: 1;
}
.step-icon {
  width: 48px; height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--grad);
  color: #fff;
  margin-bottom: var(--space-3);
}
.step-card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.step-card p { font-size: 0.92rem; color: var(--muted); margin: 0; }
@media (max-width: 992px) { .steps-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .steps-grid { grid-template-columns: 1fr; } }

/* ---------- Características ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}
.feature-card:hover,
.feature-card:focus-within {
  box-shadow: var(--shadow);
  border-color: rgba(91, 95, 239, 0.45);
  transform: translateY(-3px);
}
.feature-icon {
  width: 46px; height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--primary-dark);
  margin-bottom: var(--space-3);
}
.feature-card h3 { font-size: 1.03rem; margin-bottom: 0.4rem; }
.feature-card p { font-size: 0.92rem; color: var(--muted); margin: 0; }
@media (max-width: 992px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .features-grid { grid-template-columns: 1fr; } }

/* ---------- Privacidad ---------- */
.privacy-panel {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
  background: linear-gradient(135deg, rgba(91, 95, 239, 0.06), rgba(139, 92, 246, 0.06)), var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2.25rem);
  box-shadow: var(--shadow-sm);
}
.privacy-icon {
  width: 56px; height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--grad);
  color: #fff;
}
.privacy-list { margin-bottom: 0; }
.privacy-list li { margin-bottom: 0.55rem; }
@media (max-width: 600px) {
  .privacy-panel { grid-template-columns: 1fr; }
}

/* ---------- Comparación ---------- */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.compare-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 0.93rem;
}
.compare-table caption { padding: var(--space-2); }
.compare-table th,
.compare-table td {
  padding: 0.85rem 1rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.compare-table thead th {
  background: var(--surface-soft);
  color: var(--heading);
  font-weight: 600;
}
.compare-table th[scope="row"] {
  text-align: left;
  font-weight: 500;
  color: var(--heading);
}
.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table .col-brand {
  background: rgba(91, 95, 239, 0.07);
  font-weight: 600;
}
.mark-yes { color: var(--success); font-weight: 700; }
.mark-no { color: var(--error); font-weight: 700; }
.mark-part { color: var(--accent); font-weight: 700; }
.table-note { font-size: 0.85rem; color: var(--muted); text-align: center; margin-top: var(--space-2); }

/* ---------- Casos de uso ---------- */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.usecase-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.usecase-card:nth-child(even) { border-left-color: var(--secondary); }
.usecase-card h3 { font-size: 1.03rem; margin-bottom: 0.4rem; }
.usecase-card p { font-size: 0.92rem; color: var(--muted); margin: 0; }
@media (max-width: 992px) { .usecases-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .usecases-grid { grid-template-columns: 1fr; } }

/* ---------- Herramientas relacionadas ---------- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.related-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
}
.related-icon {
  flex: 0 0 auto;
  width: 44px; height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--muted);
}
.related-card h3 { font-size: 0.98rem; margin: 0 0 0.15rem; color: var(--muted); }
.badge-soon {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(245, 158, 11, 0.12);
  border-radius: var(--radius-pill);
  padding: 0.15rem 0.6rem;
}
@media (max-width: 992px) { .related-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .related-grid { grid-template-columns: 1fr; } }

/* ---------- Blog ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.post-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.post-card:hover,
.post-card:focus-within {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}
.post-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.post-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-4);
  gap: 0.55rem;
}
.post-tag {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary-dark);
  background: var(--surface-soft);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
}
.post-card h3 { font-size: 1.05rem; margin: 0; }
.post-card h3 a { color: var(--heading); }
.post-card h3 a:hover { color: var(--primary); }
.post-card p { font-size: 0.9rem; color: var(--muted); margin: 0; flex: 1; }
.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  font-size: 0.8rem;
  color: var(--muted);
}
.blog-cta { text-align: center; margin-top: var(--space-5); }
@media (max-width: 992px) { .blog-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .blog-grid { grid-template-columns: 1fr; } }

/* Búsqueda del blog */
.blog-toolbar {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-5);
}
.blog-search {
  position: relative;
  width: min(460px, 100%);
}
.blog-search svg {
  position: absolute;
  top: 50%; left: 14px;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.blog-search input {
  width: 100%;
  min-height: 50px;
  padding: 0.6rem 1rem 0.6rem 2.7rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  font-family: var(--font);
  font-size: 1rem;
  color: var(--heading);
  background: var(--surface);
}
.blog-search input:focus {
  border-color: var(--primary);
  outline: 3px solid rgba(91, 95, 239, 0.25);
}
.blog-empty {
  text-align: center;
  padding: var(--space-6) var(--space-3);
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
}

/* ---------- FAQ ---------- */
.faq-cat { max-width: 820px; margin: 0 auto var(--space-5); }
.faq-cat:last-child { margin-bottom: 0; }
.faq-cat h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.faq-cat h3 svg { color: var(--primary); flex: 0 0 auto; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--space-2);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 56px;
  padding: 0.9rem 1.15rem;
  background: none;
  border: none;
  font-family: var(--font);
  font-size: 0.99rem;
  font-weight: 600;
  color: var(--heading);
  text-align: left;
  cursor: pointer;
}
.faq-q .chev {
  flex: 0 0 auto;
  transition: transform var(--transition);
  color: var(--primary);
}
.faq-q[aria-expanded="true"] .chev { transform: rotate(180deg); }
.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}
.faq-a > div { overflow: hidden; }
.faq-item.is-open .faq-a { grid-template-rows: 1fr; }
.faq-a p {
  padding: 0 1.15rem 1rem;
  margin: 0;
  font-size: 0.93rem;
  color: var(--muted);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--footer);
  color: #C6CBD8;
  padding-top: var(--space-7);
  font-size: 0.92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr 1.2fr;
  gap: var(--space-5) var(--space-4);
  padding-bottom: var(--space-6);
}
.footer-brand-link { display: inline-flex; align-items: center; white-space: nowrap; margin-bottom: var(--space-3); }
.footer-brand img { width: 218px; height: 40px; max-width: none; }
.footer-brand p { color: #9AA1B2; max-width: 300px; }
.footer-col h3 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 0.55rem; }
.footer-col a { color: #C6CBD8; display: inline-block; padding: 0.1rem 0; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: var(--space-4) 0;
  text-align: center;
  color: #9AA1B2;
  font-size: 0.88rem;
}
.footer-bottom a {
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}
.footer-bottom a:hover { color: var(--accent); }
.footer-bottom p { margin: 0; }
.footer-disclaimer { margin-top: 0.45rem !important; color: #AEB5C5; font-size: 0.82rem; line-height: 1.55; }
@media (max-width: 992px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Toasts ---------- */
.toast-region {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: grid;
  gap: 0.5rem;
  width: min(420px, calc(100vw - 2rem));
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--heading);
  color: #fff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
  font-weight: 500;
  animation: toast-in 0.28s ease both;
}
.toast.is-success { border-left: 4px solid var(--success); }
.toast.is-error { border-left: 4px solid var(--error); }
.toast svg { flex: 0 0 auto; }
.toast.is-hiding { opacity: 0; transition: opacity 0.3s ease; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Volver arriba ---------- */
.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  width: 48px; height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.is-in { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Páginas internas ---------- */
.page-hero {
  text-align: center;
  padding-block: clamp(2.5rem, 6vw, 4rem);
  background:
    radial-gradient(760px 340px at 50% -160px, rgba(91, 95, 239, 0.13), transparent 70%),
    var(--background);
}
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 3rem); }
.page-hero p { max-width: 640px; margin: 0 auto; color: var(--muted); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  font-size: 0.85rem;
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 0.4rem; margin: 0; }
.breadcrumb li + li::before { content: "›"; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb [aria-current="page"] { color: var(--heading); font-weight: 500; }
.breadcrumb-left { justify-content: flex-start; }

.prose {
  max-width: 780px;
  margin-inline: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: clamp(1.5rem, 4vw, 3rem);
}
.prose h2 { font-size: clamp(1.35rem, 2.6vw, 1.7rem); margin-top: var(--space-5); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.12rem; margin-top: var(--space-4); }
.prose ul li, .prose ol li { margin-bottom: 0.5rem; }
.prose img { border-radius: var(--radius); margin-block: var(--space-3); }
.prose .updated {
  font-size: 0.85rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-5);
  align-items: start;
  max-width: 1000px;
  margin-inline: auto;
}
.about-media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  width: 100%;
}
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-media { order: -1; max-width: 420px; margin-inline: auto; }
}

.contact-card {
  max-width: 620px;
  margin-inline: auto;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: clamp(1.5rem, 4vw, 3rem);
}
.contact-email {
  display: inline-block;
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  font-weight: 700;
  color: var(--primary-dark);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  margin-block: var(--space-3) var(--space-4);
  overflow-wrap: anywhere;
}

/* ---------- Artículo ---------- */
.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: var(--space-5);
  align-items: start;
}
.post-article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  min-width: 0;
}
.post-article .post-hero-img {
  border-radius: var(--radius);
  margin-bottom: var(--space-4);
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.post-article h1 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); }
.post-article h2 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); margin-top: var(--space-5); }
.post-article h3 { font-size: 1.1rem; margin-top: var(--space-4); }
.post-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  display: grid;
  gap: var(--space-4);
}
.toc-card, .side-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.toc-card h2, .side-card h2 { font-size: 1rem; margin-bottom: var(--space-2); }
.toc-list { list-style: none; margin: 0; padding: 0; font-size: 0.88rem; }
.toc-list li { margin-bottom: 0.45rem; }
.toc-list a { color: var(--muted); display: inline-block; padding: 0.1rem 0; }
.toc-list a:hover { color: var(--primary); }
.related-posts { list-style: none; margin: 0; padding: 0; font-size: 0.9rem; }
.related-posts li { margin-bottom: 0.7rem; }
.related-posts a { color: var(--heading); font-weight: 500; }
.related-posts a:hover { color: var(--primary); }
.post-back { margin-top: var(--space-4); }
@media (max-width: 992px) {
  .post-layout { grid-template-columns: 1fr; }
  .post-sidebar { position: static; }
}

/* ---------- Impresión mínima ---------- */
@media print {
  .site-header, .site-footer, .to-top, .toast-region { display: none !important; }
}