/* ==========================================================================
   PCSuite landing — tokens de la app (--pcs-*) para coherencia de marca.
   Tema oscuro, la experiencia primaria del producto.
   ========================================================================== */
:root {
  --pcs-bg: #0b1220;
  --pcs-surface: #121a2b;
  --pcs-surface-2: #182338;
  --pcs-border: #24314c;
  --pcs-text: #e6edf7;
  --pcs-text-muted: #93a3bd;
  --pcs-accent: #3b82f6;
  --pcs-accent-hover: #2f6fe0;
  /* Fondos con texto blanco encima: #3b82f6 da 3.68:1 con #fff (falla AA).
     #2563eb → 5.17:1 ✓; hover #1d4ed8 → 6.45:1 ✓. */
  --pcs-accent-strong: #2563eb;
  --pcs-accent-strong-hover: #1d4ed8;
  --pcs-focus: #93c5fd;
  /* Texto accent: #3b82f6 cae a 4.09–4.31:1 sobre fondos tintados (chips).
     #60a5fa → 5.92–7.36:1 en todos los contextos. */
  --pcs-accent-ink: #60a5fa;
  --pcs-success: #34d399;
  --pcs-danger: #f87171;
  --pcs-warning: #fbbf24;
  --pcs-easing: cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  /* El nav es sticky: sin esto, las anclas (#descarga…) quedan bajo la barra. */
  scroll-padding-top: 76px;
}

/* Foco visible para teclado (antes no existía ningún indicador). */
:focus-visible {
  outline: 2px solid var(--pcs-focus);
  outline-offset: 3px;
}
main:focus { outline: none; }

/* Enlace de salto: primer target de teclado, oculto hasta recibir foco. */
.skip-link {
  position: absolute;
  left: 16px;
  top: -64px;
  z-index: 100;
  background: var(--pcs-accent-strong);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 0 0 10px 10px;
  transition: top 150ms var(--pcs-easing);
}
.skip-link:focus { top: 0; }

/* Texto solo para lectores de pantalla (feedback del copiar, etc.). */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--pcs-bg);
  color: var(--pcs-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Glowing hero: brillo sutil del accent detrás del logo */
.hero {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 88px 24px 64px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto;
  height: 120%;
  background:
    radial-gradient(38% 42% at 50% 32%, rgba(59, 130, 246, 0.16), transparent 70%),
    radial-gradient(28% 30% at 62% 24%, rgba(18, 170, 254, 0.10), transparent 70%);
  pointer-events: none;
}

.hero-logo {
  width: 104px;
  height: 104px;
  border-radius: 26px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  position: relative;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 20px;
  position: relative;
  text-wrap: balance;
}

.tagline {
  font-size: 1.2rem;
  color: var(--pcs-accent-ink);
  font-weight: 600;
  margin-top: 8px;
  position: relative;
}

.hero .sub {
  max-width: 640px;
  margin: 18px auto 0;
  color: var(--pcs-text-muted);
  position: relative;
}

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 32px;
  position: relative;
}

.hero-note {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--pcs-text-muted);
  position: relative;
}

/* ---------------- Nav ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 12px 24px;
  background: color-mix(in srgb, var(--pcs-bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--pcs-border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--pcs-text);
  text-decoration: none;
}
.nav-brand img { border-radius: 7px; }

.nav-links { display: flex; gap: 6px 18px; margin-left: auto; }
.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 2px;
  color: var(--pcs-text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 120ms var(--pcs-easing);
}
.nav-links a:hover { color: var(--pcs-text); }

/* Atribución del estudio: logo + texto, enlace de vuelta a la home. */
.nav-studio {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  color: var(--pcs-text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding-left: 16px;
  border-left: 1px solid var(--pcs-border);
  transition: color 120ms var(--pcs-easing);
}
.nav-studio:hover { color: var(--pcs-text); }
.nav-studio img { border-radius: 6px; }

/* ---------------- Layout ---------------- */
.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 24px 32px;
}

.section h2 {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  text-wrap: balance;
}

.section-sub {
  color: var(--pcs-text-muted);
  margin-bottom: 28px;
  max-width: 720px;
}

.version-chip {
  display: inline-block;
  vertical-align: 6px;
  min-width: 5ch;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--pcs-accent-ink);
  background: color-mix(in srgb, var(--pcs-accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--pcs-accent) 34%, transparent);
  border-radius: 999px;
  padding: 3px 12px;
  margin-left: 10px;
}

/* ---------------- Cards ---------------- */
/* min(...,100%) evita el scroll horizontal en viewports de 320px:
   un minmax fijo de 320px desborda el contenedor (272px útiles). */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  gap: 18px;
}

.card {
  background: var(--pcs-surface);
  border: 1px solid var(--pcs-border);
  border-radius: 14px;
  padding: 22px;
}

.artifact-card header {
  display: flex;
  flex-wrap: wrap; /* en 320px el chip se salía de la tarjeta */
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.artifact-card h3 small {
  color: var(--pcs-text-muted);
  font-weight: 500;
}

.chip {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--pcs-text-muted);
  background: var(--pcs-surface-2);
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}
.chip-accent {
  color: var(--pcs-accent-ink);
  background: color-mix(in srgb, var(--pcs-accent) 12%, transparent);
}

.artifact-desc { color: var(--pcs-text-muted); font-size: 0.93rem; }

.artifact-meta {
  font-size: 0.85rem;
  color: var(--pcs-text-muted);
  margin: 10px 0 16px;
}

/* ---------------- Botones ---------------- */
.btn {
  display: inline-block;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 200ms var(--pcs-easing), border-color 200ms var(--pcs-easing),
    transform 120ms var(--pcs-easing);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--pcs-accent-strong);
  color: #fff;
}
.btn-primary:hover { background: var(--pcs-accent-strong-hover); }

.btn-ghost {
  background: var(--pcs-surface-2);
  color: var(--pcs-text);
  border-color: #556da8; /* 3.43:1 vs tarjeta / 3.10:1 vs relleno (WCAG 1.4.11) */
}
.btn-ghost:hover { border-color: var(--pcs-accent); }

.btn-block { display: block; text-align: center; }

/* ---------------- Hash / verificación ---------------- */
.hash-box {
  margin-top: 16px;
  background: var(--pcs-bg);
  border: 1px solid var(--pcs-border);
  border-radius: 10px;
  padding: 10px 12px;
}

.hash-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--pcs-text-muted);
  margin-bottom: 6px;
}

.btn-copy {
  font: inherit;
  font-size: 0.75rem;
  min-height: 34px;
  color: var(--pcs-accent-ink);
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--pcs-accent) 34%, transparent);
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  transition: color 120ms var(--pcs-easing), border-color 120ms var(--pcs-easing);
}
.btn-copy:hover { color: var(--pcs-success); border-color: var(--pcs-success); }
.btn-copy.copied { color: var(--pcs-success); border-color: var(--pcs-success); }

.hash-box code,
.verify code {
  display: block;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.78rem;
  color: var(--pcs-text-muted);
  word-break: break-all;
  white-space: pre-wrap;
}

.verify {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--pcs-text-muted);
}
.verify code {
  margin-top: 4px;
  background: var(--pcs-bg);
  border: 1px solid var(--pcs-border);
  border-radius: 8px;
  padding: 8px 10px;
}

.error-box {
  border: 1px solid color-mix(in srgb, var(--pcs-warning) 50%, transparent);
  background: color-mix(in srgb, var(--pcs-warning) 8%, transparent);
  color: var(--pcs-warning);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 0.9rem;
}
.error-box a { color: inherit; }

/* ---------------- Features ---------------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 14px;
}

.feature {
  transition: border-color 200ms var(--pcs-easing), transform 200ms var(--pcs-easing);
}
.feature:hover {
  border-color: var(--pcs-accent);
  transform: translateY(-2px);
}

.feature h3 { font-size: 1rem; margin-bottom: 6px; }
.feature p { font-size: 0.88rem; color: var(--pcs-text-muted); }

/* ---------------- Footer ---------------- */
footer {
  border-top: 1px solid var(--pcs-border);
  margin-top: 56px;
  padding: 36px 24px 48px;
  text-align: center;
  color: var(--pcs-text-muted);
  font-size: 0.85rem;
}
footer p { margin: 6px 0; }
footer code {
  font-family: ui-monospace, Consolas, monospace;
  color: var(--pcs-text-muted);
}

@media (max-width: 640px) {
  /* El nav no se oculta: se envuelve a una segunda fila.
     Ocultarlo dejaba la página sin navegación en móvil. */
  .nav { flex-wrap: wrap; gap: 2px 16px; padding: 8px 16px; }
  html { scroll-padding-top: 112px; }
  .nav-links {
    order: 3;
    width: 100%;
    margin-left: 0;
    flex-wrap: wrap; /* nunca scroll oculto: los 4 enlaces deben verse siempre */
    gap: 4px 16px;
  }
  .nav-studio { margin-left: auto; padding-left: 0; border-left: none; }
}

/* Móvil estrecho: los 4 enlaces del nav pasan a dos filas. */
@media (max-width: 380px) {
  html { scroll-padding-top: 150px; }
}

/* Targets táctiles: mínimo 44px en punteros coarse (regla crítica). */
@media (pointer: coarse) {
  .nav-links a,
  .nav-studio,
  .btn-copy { min-height: 44px; }
}

/* Respeta la preferencia de movimiento reducido del sistema. */
@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;
  }
  .skip-link { transition: none; }
  .feature:hover,
  .btn:active { transform: none; }
}

/* ---------------- Verification section ---------------- */
.verification-box {
  background: var(--pcs-surface);
  border: 1px solid var(--pcs-border);
  border-radius: 14px;
  padding: 24px;
  max-width: 720px;
}

.fingerprint-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.fingerprint-label {
  font-size: 0.85rem;
  color: var(--pcs-text-muted);
  font-weight: 500;
}

.fingerprint-value {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.8rem;
  color: var(--pcs-accent-ink);
  background: var(--pcs-bg);
  border: 1px solid var(--pcs-border);
  border-radius: 8px;
  padding: 6px 10px;
  word-break: break-all;
  white-space: pre-wrap;
}