/* ═══════════════════════════════════════════════════════════════
   PIEL Y LÁSER · PREMIUM BRAND IDENTITY SYSTEM
   Dr. Edward Sánchez Montoya · Bucaramanga
   ═══════════════════════════════════════════════════════════════ */

/* ── TOKENS DE MARCA ───────────────────────────────────────────── */
:root {
  /* Paleta premium */
  --brand-black:    #06070c;
  --brand-dark:     #0d0e14;
  --brand-silver:   #c8cdd6;
  --brand-platinum: #e8eaed;
  --brand-white:    #f5f6fa;
  --brand-blue:     #4a7eff;
  --brand-blue-dim: rgba(74,126,255,.18);
  --brand-glow:     rgba(74,126,255,.25);

  /* Gradientes de marca */
  --grad-silver: linear-gradient(135deg, #b8bdc6 0%, #e0e3e8 40%, #c4c8d1 70%, #9ea3ad 100%);
  --grad-dark:   linear-gradient(135deg, #1a1b22 0%, #0d0e14 100%);
  --grad-glass:  linear-gradient(135deg, rgba(255,255,255,.07) 0%, rgba(255,255,255,.02) 100%);

  /* Sombras cinematográficas */
  --shadow-logo:    0 8px 32px rgba(0,0,0,.45), 0 2px 8px rgba(0,0,0,.3);
  --shadow-glow:    0 0 20px var(--brand-glow), 0 0 60px rgba(74,126,255,.08);
  --shadow-premium: 0 20px 60px rgba(0,0,0,.35), 0 4px 16px rgba(0,0,0,.2);

  /* Timing curves premium */
  --ease-premium: cubic-bezier(.22,.68,0,1.2);
  --ease-smooth:  cubic-bezier(.4,0,.2,1);
  --ease-spring:  cubic-bezier(.34,1.56,.64,1);
}

/* ═══════════════════════════════════════════════════════════════
   NAV BRAND — LOGOS EN NAV
   ═══════════════════════════════════════════════════════════════ */

/* Animación de entrada del nav-brand */
.nav-brand {
  animation: brand-fade-in .6s var(--ease-smooth) both;
}

@keyframes brand-fade-in {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ═══════════════════════════════════════════════════════════════
   FLIP CARD BRAND — LOGO ROTATORIO PREMIUM
   ═══════════════════════════════════════════════════════════════ */

.nav-brand {
  flex-shrink: 0;
}

/* Contenedor con perspectiva 3D */
.brand-flipcard {
  display: block;
  perspective: 900px;
  text-decoration: none;
  cursor: pointer;
  /* dimensiones desktop por defecto — overrides en styles.css */
  width: 340px;
  height: 88px;
  flex-shrink: 0;
}

/* Inner — el que rota */
.brand-flipcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.82s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
  transform: translateZ(0);
}

/* Estado girado (añadido por JS) */
.brand-flipcard-inner.flipped {
  transform: rotateY(180deg);
}

/* Caras común */
.brand-flipcard-front,
.brand-flipcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Cara trasera ya girada 180° */
.brand-flipcard-back {
  transform: rotateY(180deg);
}

/* ── FRONT: isotipo circular ── */
.brand-flipcard-front img,
.nav-logo-dr {
  display: block;
  height: 82px;
  width: 82px;
  max-height: 82px;
  max-width: 82px;
  object-fit: contain;
  border-radius: 50%;
  flex-shrink: 0;
  image-rendering: -webkit-optimize-contrast;
  filter: drop-shadow(0 2px 10px rgba(0,0,0,.14))
          drop-shadow(0 0 1px rgba(0,0,0,.08));
  transition: filter .4s var(--ease-smooth), transform .4s var(--ease-spring);
}

.brand-flipcard:hover .brand-flipcard-front img {
  filter: drop-shadow(0 3px 16px rgba(0,0,0,.2))
          drop-shadow(0 0 8px rgba(74,126,255,.12));
  transform: scale(1.04) rotate(-1.5deg);
}

/* ── BACK: wordmark ── */
.brand-flipcard-back img,
.nav-logo-pyl {
  display: block;
  height: auto;
  max-height: 82px;
  width: auto;
  max-width: 320px;
  object-fit: contain;
  flex-shrink: 0;
  image-rendering: -webkit-optimize-contrast;
  filter: drop-shadow(0 1px 6px rgba(0,0,0,.1));
  transition: filter .4s var(--ease-smooth), transform .4s var(--ease-spring);
}

.brand-flipcard:hover .brand-flipcard-back img {
  filter: drop-shadow(0 2px 10px rgba(0,0,0,.15));
  transform: scale(1.03);
}

/* Wordmark en fondos oscuros (footer, secciones dark) */
.sec-dark .nav-logo-pyl,
footer .nav-logo-pyl,
.dark-surface .nav-logo-pyl {
  filter: invert(1);
}

/* ═══════════════════════════════════════════════════════════════
   LOGOS DE CERTIFICACIONES — VERSIÓN PREMIUM PARA FONDOS OSCUROS
   ═══════════════════════════════════════════════════════════════ */

/* Flip cards de membresías/certificaciones */
.flip-front img,
.flip-back img {
  transition: filter .4s var(--ease-smooth),
              transform .4s var(--ease-spring);
}

/* Certificados con fondo transparente en superficie oscura */
.flip-front img.cert-logo,
.flip-back img.cert-logo {
  filter: brightness(1.1) contrast(1.05) saturate(0.9);
  mix-blend-mode: screen;
}

/* Orbital animations logos */
.orb-icon img {
  transition: filter .3s ease, transform .3s var(--ease-spring);
  mix-blend-mode: screen;
  filter: brightness(1.15) contrast(1.1);
}
.orb-item:hover .orb-icon img {
  filter: brightness(1.3) contrast(1.15) drop-shadow(0 0 6px rgba(74,126,255,.4));
  transform: scale(1.1);
}

/* ═══════════════════════════════════════════════════════════════
   BOTÓN WHATSAPP — PREMIUM
   ═══════════════════════════════════════════════════════════════ */

.btn-wa {
  position: relative;
  overflow: hidden;
  transition: transform .3s var(--ease-spring),
              box-shadow .3s ease,
              background .3s ease !important;
}

.btn-wa::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}

.btn-wa:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 6px 20px rgba(37,211,102,.3);
}

.btn-wa:hover::before {
  opacity: 1;
}

.btn-wa svg {
  transition: transform .35s var(--ease-spring);
}
.btn-wa:hover svg {
  transform: scale(1.12) rotate(-5deg);
}

/* ═══════════════════════════════════════════════════════════════
   BOTONES PRINCIPALES — PREMIUM EFFECTS
   ═══════════════════════════════════════════════════════════════ */

.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(255,255,255,.12) 0%,
    rgba(255,255,255,0) 50%,
    rgba(255,255,255,.06) 100%
  );
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
  border-radius: inherit;
}

.btn-primary:hover::after {
  opacity: 1;
}

.btn-primary:active {
  transform: scale(0.97);
  transition-duration: .1s;
}

/* ═══════════════════════════════════════════════════════════════
   STAT CARDS — GLOW HOVER
   ═══════════════════════════════════════════════════════════════ */

.stat-item {
  transition: transform .35s var(--ease-spring);
}

.stat-item:hover {
  transform: translateY(-3px);
}

.stat-n {
  background: var(--grad-silver);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: filter .3s ease;
}

.stat-item:hover .stat-n {
  filter: drop-shadow(0 0 12px rgba(74,126,255,.3));
}

/* ═══════════════════════════════════════════════════════════════
   NAV — PREMIUM GLASSMORPHISM UPGRADE
   ═══════════════════════════════════════════════════════════════ */

nav {
  /* Upgrade glassmorphism */
  background: rgba(255,255,255,.93) !important;
  backdrop-filter: blur(24px) saturate(200%) brightness(1.02) !important;
  -webkit-backdrop-filter: blur(24px) saturate(200%) brightness(1.02) !important;
  border-bottom: 1px solid rgba(0,0,0,.06) !important;
  transition: box-shadow .3s ease, background .3s ease !important;
}

nav.nav-scrolled {
  box-shadow: 0 2px 24px rgba(0,0,0,.08), 0 1px 0 rgba(255,255,255,.8) inset !important;
}

/* Nav links — hover premium */
.nav-links a {
  position: relative;
  transition: color .25s ease !important;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%;
  height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--brand-blue), transparent);
  transition: transform .3s var(--ease-smooth);
  border-radius: 1px;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-links a.active {
  color: var(--brand-blue) !important;
}

/* Hamburger — smooth */
.nav-ham span {
  transition: transform .3s var(--ease-smooth),
              opacity .3s ease,
              background .3s ease !important;
}

/* ═══════════════════════════════════════════════════════════════
   SECCIONES — EYEBROW PREMIUM
   ═══════════════════════════════════════════════════════════════ */

.sec-eyebrow {
  position: relative;
  display: inline-block;
  letter-spacing: .18em !important;
}

.sec-eyebrow::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 1px;
  background: currentColor;
  opacity: .5;
}

.sec-eyebrow::after {
  content: '';
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 1px;
  background: currentColor;
  opacity: .5;
}

/* ═══════════════════════════════════════════════════════════════
   FEAT CARDS — MICRO-ELEVACIÓN
   ═══════════════════════════════════════════════════════════════ */

.feat-check {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%) !important;
  border: 1px solid rgba(74,126,255,.2) !important;
  box-shadow: 0 0 0 0 var(--brand-glow);
  transition: box-shadow .3s ease, transform .3s var(--ease-spring) !important;
}

.feat-item:hover .feat-check {
  box-shadow: 0 0 12px var(--brand-glow);
  transform: scale(1.1);
}

.feat-link {
  position: relative;
  transition: color .25s ease, letter-spacing .25s ease !important;
}

.feat-link:hover {
  letter-spacing: .02em;
}

/* ═══════════════════════════════════════════════════════════════
   FOOTER BRAND — GRADIENTE PLATEADO
   ═══════════════════════════════════════════════════════════════ */

.footer-brand {
  background: var(--grad-silver);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700 !important;
  letter-spacing: .01em;
}

/* ═══════════════════════════════════════════════════════════════
   ANIMACIÓN DE SHIMMER — EFECTO PREMIUM EN LOGOS
   ═══════════════════════════════════════════════════════════════ */

@keyframes shimmer-pass {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.nav-brand a:focus-visible {
  outline: 2px solid var(--brand-blue);
  outline-offset: 4px;
  border-radius: 6px;
}

/* ═══════════════════════════════════════════════════════════════
   SCROLL INDICATOR NAV — añade sombra al hacer scroll
   ═══════════════════════════════════════════════════════════════ */

/* Aplicado via JS — ver main.js */
nav.elevated {
  box-shadow: 0 4px 32px rgba(0,0,0,.1), 0 1px 0 rgba(255,255,255,.9) inset !important;
  background: rgba(255,255,255,.97) !important;
}

/* ═══════════════════════════════════════════════════════════════
   MOBILE MENU — PREMIUM
   ═══════════════════════════════════════════════════════════════ */

.nav-mobile-menu {
  background: rgba(255,255,255,.97) !important;
  backdrop-filter: blur(20px) saturate(180%) !important;
  -webkit-backdrop-filter: blur(20px) saturate(180%) !important;
  border-bottom: 1px solid rgba(0,0,0,.06) !important;
}

.nav-mobile-menu a {
  transition: color .2s ease, padding-left .2s ease !important;
}

.nav-mobile-menu a:hover {
  color: var(--brand-blue) !important;
  padding-left: 28px !important;
}

/* ═══════════════════════════════════════════════════════════════
   REDUCED MOTION — Respeto accesibilidad
   ═══════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  .brand-flipcard-inner {
    transition: none !important;
  }
  .nav-logo-dr,
  .nav-logo-pyl,
  .brand-flipcard-front img,
  .brand-flipcard-back img,
  .btn-wa,
  .btn-primary,
  .stat-item,
  .feat-check,
  .nav-links a::after {
    transition: none !important;
    animation: none !important;
  }
}