/* ==========================================================================
   YUNIA SAUQUET · CENTRO MÉDICO ESTÉTICO & ALTA PELUQUERÍA BILBAO
   Haute Esthétique Médicale Design System & Super VIP Visual Architecture
   ========================================================================== */

:root {
  /* Surface & Canvas Tones */
  --bg-alabaster: #FAF8F5;
  --bg-ivory: #FDFCF9;
  --surface-lowest: #FFFFFF;
  --surface-low: #F5F1EB;
  --surface-card: #FAF7F2;
  --surface-high: #EAE2D4;
  --surface-highest: #E2D8C7;

  /* Champagne Gold Metallics */
  --gold-champagne: #D4B26F;
  --gold-champagne-light: #EEDEB9;
  --gold-champagne-dark: #B38E3A;
  --gold-accent: #C29B38;
  --gold-border: rgba(212, 178, 111, 0.38);
  --gold-border-subtle: rgba(212, 178, 111, 0.18);
  --gold-glow: rgba(212, 178, 111, 0.28);

  /* Deep Clinical Emerald & Contrast Tones */
  --emerald-clinical: #1B3B36;
  --emerald-deep: #032521;
  --emerald-light: #E7EFEA;
  --emerald-border: rgba(27, 59, 54, 0.25);
  --emerald-glow: rgba(27, 59, 54, 0.18);

  /* Pigments & Typography */
  --charcoal-black: #1E1A16;
  --bronze-body: #2C2621;
  --bronze-muted: #595048;
  --outline-stone: #998E82;
  --terracotta-accent: #B86548;

  /* Typography */
  --font-display: 'Playfair Display', 'Bodoni Moda', serif;
  --font-editorial: 'Bodoni Moda', 'Playfair Display', serif;
  --font-accent: 'Tenor Sans', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-unit: 1rem;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100%;
}

body {
  background-color: var(--bg-alabaster);
  color: var(--charcoal-black);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  max-width: 100%;
  width: 100%;
  position: relative;
  selection-background-color: var(--gold-champagne-light);
  selection-color: var(--charcoal-black);
}

::selection {
  background: var(--gold-champagne-light);
  color: var(--charcoal-black);
}

::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-alabaster);
}
::-webkit-scrollbar-thumb {
  background: var(--gold-champagne-light);
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--gold-champagne);
}

/* Typography Scale */
h1, h2, h3, .font-display {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.015em;
}

.font-editorial {
  font-family: var(--font-editorial);
}

.font-accent {
  font-family: var(--font-accent);
}

.label-clinical {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.label-action {
  font-family: var(--font-accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* Super VIP Image Retouch & Visual Grading */
.vip-img-frame {
  position: relative;
  overflow: hidden;
  border-radius: 1.5rem;
  border: 1px solid var(--gold-border);
  box-shadow: 0 16px 40px -10px rgba(30, 26, 22, 0.08), 0 0 0 1px rgba(255, 255, 255, 0.8) inset;
  background: var(--surface-lowest);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.vip-img-frame:hover {
  border-color: var(--gold-champagne);
  box-shadow: 0 24px 50px -12px rgba(194, 155, 56, 0.22), 0 0 0 1.5px rgba(212, 178, 111, 0.5) inset;
  transform: translateY(-4px);
}

.vip-img-retouch {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Super VIP color grading: enhanced warm undertones, soft highlights, editorial contrast */
  filter: contrast(1.04) brightness(1.02) saturate(1.06) sepia(0.04);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1), filter 0.8s ease;
  will-change: transform;
}

.vip-img-frame:hover .vip-img-retouch {
  transform: scale(1.06);
  filter: contrast(1.06) brightness(1.04) saturate(1.08) sepia(0.02);
}

/* Glassmorphism Sheets */
.glass-header {
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(234, 226, 212, 0.8);
  box-shadow: 0 4px 24px rgba(212, 178, 111, 0.05);
}

.glass-card {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--gold-border);
  box-shadow: 0 12px 36px -8px rgba(30, 26, 22, 0.06);
}

/* Gold Shimmer Button */
.btn-gold-shimmer {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.875rem 1.875rem;
  border-radius: 0.25rem;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  text-decoration: none;
  border: none;
}

.btn-gold-shimmer::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -150%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    115deg,
    transparent 20%,
    rgba(255, 255, 255, 0.35) 45%,
    rgba(255, 255, 255, 0.7) 50%,
    rgba(255, 255, 255, 0.35) 55%,
    transparent 80%
  );
  transform: rotate(25deg);
  pointer-events: none;
}

.btn-gold-shimmer:hover::before {
  left: 120%;
  transition: all 0.85s cubic-bezier(0.19, 1, 0.22, 1);
}

.btn-primary-dark {
  background: var(--charcoal-black);
  color: var(--bg-alabaster);
  box-shadow: 0 6px 20px rgba(30, 26, 22, 0.2);
}

.btn-primary-dark:hover {
  background: var(--gold-champagne-dark);
  color: #FFFFFF;
  box-shadow: 0 8px 24px rgba(179, 142, 58, 0.35);
  transform: translateY(-2px);
}

.btn-emerald {
  background: var(--emerald-clinical);
  color: #FFFFFF;
  box-shadow: 0 6px 20px rgba(27, 59, 54, 0.25);
}

.btn-emerald:hover {
  background: var(--emerald-deep);
  box-shadow: 0 8px 26px rgba(3, 37, 33, 0.4);
  transform: translateY(-2px);
}

.btn-secondary-outline {
  background: #FFFFFF;
  color: var(--charcoal-black);
  border: 1px solid var(--gold-champagne);
}

.btn-secondary-outline:hover {
  background: var(--surface-card);
  border-color: var(--gold-champagne-dark);
  transform: translateY(-2px);
}

/* Champagne Glow Animation */
.champagne-border-glow {
  box-shadow: 0 0 0 1px rgba(212, 178, 111, 0.35), 0 12px 36px -8px rgba(194, 155, 56, 0.12);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.champagne-border-glow:hover {
  box-shadow: 0 0 0 1.5px rgba(212, 178, 111, 0.65), 0 20px 40px -10px rgba(194, 155, 56, 0.22);
}

/* Breathing Gold Ambient Glow */
@keyframes goldBreath {
  0%, 100% {
    box-shadow: inset 0 0 25px rgba(212, 178, 111, 0.08), 0 4px 20px rgba(0, 0, 0, 0.25);
  }
  50% {
    box-shadow: inset 0 0 45px rgba(212, 178, 111, 0.25), 0 8px 32px rgba(194, 155, 56, 0.28);
  }
}

.promo-ambient-glow {
  animation: goldBreath 4s infinite ease-in-out;
}

/* Floating WhatsApp Rhythmic Soft Pulse */
@keyframes gentlePulseWhatsApp {
  0%, 100% {
    box-shadow: 0 10px 28px rgba(212, 178, 111, 0.28), 0 0 0 0 rgba(212, 178, 111, 0.45);
  }
  50% {
    box-shadow: 0 14px 36px rgba(212, 178, 111, 0.45), 0 0 0 12px rgba(212, 178, 111, 0);
  }
}

.floating-whatsapp-pulse {
  animation: gentlePulseWhatsApp 3s infinite ease-in-out;
}

/* Nav Link Underline */
.nav-link-indicator {
  position: relative;
  text-decoration: none;
}

.nav-link-indicator::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 1.5px;
  background: var(--gold-champagne);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform: translateX(-50%);
}

.nav-link-indicator:hover::after,
.nav-link-indicator.active::after {
  width: 85%;
}

/* Interactive Before / After Split Slider */
.before-after-container {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: 1.25rem;
  user-select: none;
  border: 1px solid var(--gold-border);
  box-shadow: 0 16px 40px rgba(30, 26, 22, 0.1);
}

.before-after-container img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.before-after-overlay {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 50%;
  overflow: hidden;
  border-right: 2px solid var(--gold-champagne);
  transition: width 0.05s linear;
}

.before-after-overlay img {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  max-width: none;
}

.before-after-slider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  background: var(--gold-champagne);
  cursor: ew-resize;
  transform: translateX(-50%);
  z-index: 20;
}

.before-after-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 2px solid var(--gold-champagne);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--charcoal-black);
}

/* Modal Styling */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(30, 26, 22, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  padding: 1.5rem;
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: #FFFFFF;
  border: 1px solid var(--gold-champagne);
  border-radius: 1.5rem;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.96);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 2.5rem;
}

.modal-backdrop.open .modal-dialog {
  transform: translateY(0) scale(1);
}

/* Scroll Reveal */
.reveal-init {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-init.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Treatments Tabs */
.tab-btn {
  font-family: var(--font-accent);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.625rem 1.25rem;
  border-radius: 0.375rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--bronze-muted);
  cursor: pointer;
  transition: all 0.25s ease;
}

.tab-btn:hover {
  color: var(--charcoal-black);
  background: var(--surface-low);
}

.tab-btn.active {
  background: #FFFFFF;
  color: var(--charcoal-black);
  border-color: var(--gold-champagne);
  box-shadow: 0 2px 8px rgba(212, 178, 111, 0.15);
  font-weight: 600;
}

/* Toast */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--charcoal-black);
  color: #FFFFFF;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  border: 1px solid var(--gold-champagne);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  z-index: 200;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.toast-notice.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Mobile & Narrow Viewport Adjustments */
@media (max-width: 640px) {
  .modal-backdrop {
    padding: 1rem;
  }
  .modal-dialog {
    padding: 1.5rem 1.25rem;
    border-radius: 1.25rem;
  }
  .tab-btn {
    padding: 0.5rem 0.875rem;
    font-size: 0.75rem;
  }
}