/* ============================================================
   BRITECH-IA · Design Tokens v1
   Shared across: ClinicFlow, VoiceCloser, DispatchOne, Enterprise
   Aesthetic: Dark futurist · Silver · Gold · Electric
   ============================================================ */

:root {
  /* -- Surfaces (depth layers) -- */
  --bg-void:        #05060A;
  --bg-deep:        #0B0D14;
  --bg-elevated:    #12141C;
  --bg-card:        #161924;
  --bg-card-hover:  #1B1F2C;
  --bg-overlay:     rgba(11, 13, 20, 0.72);

  /* -- Silver scale (texto / bordes metalizados) -- */
  --silver-50:   #F5F7FB;
  --silver-100:  #E8ECF4;
  --silver-200:  #C8CEDB;
  --silver-300:  #9BA3B4;
  --silver-400:  #757D8E;
  --silver-500:  #5B6478;
  --silver-600:  #424A5C;
  --silver-700:  #2B3142;
  --silver-800:  #1C2030;
  --silver-900:  #11141F;

  /* -- Gold (acento premium · ClinicFlow primary) -- */
  --gold-base:   #D4A857;
  --gold-glow:   #F4C97A;
  --gold-deep:   #A8842F;
  --gold-soft:   rgba(212, 168, 87, 0.12);
  --gold-border: rgba(212, 168, 87, 0.28);

  /* -- Electric blue (acento tech · VoiceCloser primary) -- */
  --electric:        #5CE1FF;
  --electric-deep:   #0AA5D1;
  --electric-glow:   #8FECFF;
  --electric-soft:   rgba(92, 225, 255, 0.10);
  --electric-border: rgba(92, 225, 255, 0.26);

  /* -- Functional -- */
  --success:    #5FD49B;
  --warning:    #F4C97A;
  --danger:     #FF6B6B;
  --info:       #5CE1FF;

  /* -- Gradients hero -- */
  --gradient-aurora:    linear-gradient(135deg, #5CE1FF 0%, #C8CEDB 38%, #D4A857 100%);
  --gradient-noir:      linear-gradient(180deg, #05060A 0%, #0B0D14 60%, #12141C 100%);
  --gradient-gold:      linear-gradient(135deg, #F4C97A 0%, #D4A857 60%, #A8842F 100%);
  --gradient-electric:  linear-gradient(135deg, #8FECFF 0%, #5CE1FF 50%, #0AA5D1 100%);
  --gradient-silver:    linear-gradient(135deg, #F5F7FB 0%, #C8CEDB 50%, #757D8E 100%);
  --gradient-text-gold: linear-gradient(135deg, #F4C97A 0%, #D4A857 100%);
  --gradient-text-ice:  linear-gradient(135deg, #E8ECF4 0%, #5CE1FF 100%);

  /* -- Glows ambientales -- */
  --glow-gold:     radial-gradient(circle, rgba(212, 168, 87, 0.14) 0%, transparent 70%);
  --glow-electric: radial-gradient(circle, rgba(92, 225, 255, 0.18) 0%, transparent 70%);
  --glow-silver:   radial-gradient(circle, rgba(200, 206, 219, 0.10) 0%, transparent 70%);

  /* -- Borders -- */
  --border-subtle:   rgba(232, 236, 244, 0.06);
  --border-soft:     rgba(232, 236, 244, 0.10);
  --border-strong:   rgba(232, 236, 244, 0.18);
  --border-gold:     rgba(212, 168, 87, 0.32);
  --border-electric: rgba(92, 225, 255, 0.30);

  /* -- Shadows (premium · soft · luminous) -- */
  --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md:  0 6px 18px rgba(0, 0, 0, 0.40);
  --shadow-lg:  0 18px 48px rgba(0, 0, 0, 0.55);
  --shadow-xl:  0 32px 80px -16px rgba(0, 0, 0, 0.65);
  --shadow-glow-gold:     0 0 32px rgba(212, 168, 87, 0.28);
  --shadow-glow-electric: 0 0 32px rgba(92, 225, 255, 0.30);

  /* -- Type scale -- */
  --font-display: 'Geist', 'Inter Display', 'Inter', system-ui, -apple-system, sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --fs-xs:    0.75rem;
  --fs-sm:    0.875rem;
  --fs-base:  1rem;
  --fs-lg:    1.125rem;
  --fs-xl:    1.25rem;
  --fs-2xl:   1.5rem;
  --fs-3xl:   2rem;
  --fs-4xl:   2.75rem;
  --fs-5xl:   3.75rem;
  --fs-6xl:   5rem;
  --fs-7xl:   6.5rem;

  /* -- Spacing -- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* -- Radius -- */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-2xl: 32px;
  --r-full: 999px;

  /* -- Motion -- */
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:    180ms;
  --dur-base:    320ms;
  --dur-slow:    560ms;

  /* -- Layout -- */
  --container-max: 1280px;
  --container-pad: clamp(1.25rem, 4vw, 2.5rem);
  --nav-h: 72px;
}

/* ============================================================
   Base reset & body (dark futurist canvas)
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--silver-100);
  background: var(--bg-void);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(92, 225, 255, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(212, 168, 87, 0.06), transparent);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01', 'cv11';
  position: relative;
}

/* Subtle grain overlay para sensación premium / film */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--silver-50);
}

/* Selection */
::selection { background: var(--gold-base); color: var(--bg-void); }

/* ============================================================
   Shared atoms
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  position: relative;
  z-index: 2;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver-300);
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--r-full);
  background: var(--bg-elevated);
  backdrop-filter: blur(8px);
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--gold-base);
  box-shadow: 0 0 8px var(--gold-base);
}
.eyebrow.electric .dot { background: var(--electric); box-shadow: 0 0 8px var(--electric); }

.text-gold { background: var(--gradient-text-gold); -webkit-background-clip: text; background-clip: text; color: transparent; }
.text-ice  { background: var(--gradient-text-ice);  -webkit-background-clip: text; background-clip: text; color: transparent; }
.text-silver { background: var(--gradient-silver);  -webkit-background-clip: text; background-clip: text; color: transparent; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.95rem 1.6rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: -0.005em;
  border-radius: var(--r-full);
  transition: all var(--dur-base) var(--ease-out);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary-gold {
  background: var(--gradient-gold);
  color: var(--bg-void);
  box-shadow: var(--shadow-glow-gold), var(--shadow-md);
}
.btn-primary-gold:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow-gold), var(--shadow-lg); }

.btn-primary-electric {
  background: var(--gradient-electric);
  color: var(--bg-void);
  box-shadow: var(--shadow-glow-electric), var(--shadow-md);
}
.btn-primary-electric:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow-electric), var(--shadow-lg); }

.btn-ghost {
  background: transparent;
  color: var(--silver-100);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--bg-elevated); border-color: var(--silver-300); }

.btn-arrow::after {
  content: '→';
  transition: transform var(--dur-base) var(--ease-out);
}
.btn-arrow:hover::after { transform: translateX(4px); }

/* Cards genéricos */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-xl);
  padding: var(--space-8);
  transition: all var(--dur-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.card:hover { border-color: var(--border-strong); background: var(--bg-card-hover); transform: translateY(-2px); }

/* Divider luminoso */
.divider-glow {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--silver-700), transparent);
  margin: var(--space-16) 0;
}

/* Animaciones reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   Shared NAV (paraguas Britech-IA)
   ============================================================ */

.bi-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(5, 6, 10, 0.72);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  border-bottom: 1px solid var(--border-subtle);
}
.bi-nav .container { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }

.bi-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--silver-50);
}
.bi-logo .sep {
  display: inline-block;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--gradient-gold);
  box-shadow: 0 0 8px var(--gold-base);
}
.bi-logo .product {
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--silver-300);
  padding-left: 0.6rem;
  margin-left: 0.4rem;
  border-left: 1px solid var(--border-strong);
}

.bi-nav-links { display: none; gap: 0.4rem; }
@media (min-width: 900px) {
  .bi-nav-links { display: flex; }
}
.bi-nav-link {
  font-size: 0.9rem;
  color: var(--silver-300);
  padding: 0.5rem 0.85rem;
  border-radius: var(--r-md);
  transition: all var(--dur-fast) var(--ease-out);
}
.bi-nav-link:hover { color: var(--silver-50); background: var(--bg-elevated); }
.bi-nav-link.is-active { color: var(--silver-50); background: var(--bg-elevated); }

.bi-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: var(--r-full);
  background: var(--silver-50);
  color: var(--bg-void);
  transition: all var(--dur-base) var(--ease-out);
}
.bi-nav-cta:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* ============================================================
   Shared FOOTER (paraguas)
   ============================================================ */

.bi-footer {
  margin-top: var(--space-24);
  padding: var(--space-20) 0 var(--space-12);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-deep);
}
.bi-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}
@media (max-width: 768px) {
  .bi-footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
}
.bi-footer h4 {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--silver-300);
  margin-bottom: var(--space-4);
}
.bi-footer ul { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.bi-footer a {
  color: var(--silver-200);
  font-size: 0.92rem;
  transition: color var(--dur-fast) var(--ease-out);
}
.bi-footer a:hover { color: var(--gold-glow); }

.bi-footer-tag {
  color: var(--silver-400);
  font-size: 0.9rem;
  max-width: 320px;
  margin-top: var(--space-3);
}
.bi-footer-bottom {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--silver-400);
}