/* ========================================
   IRON CUBAN GYM • ESTILOS PRINCIPALES
   Versión: 2.0 • Production Ready
   ======================================== */

/* ========================================
   1. VARIABLES & CONFIGURACIÓN GLOBAL
   ======================================== */
:root {
  /* 🎨 Paleta de Colores */
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-bg-glass: rgba(30, 41, 59, 0.75);
  --color-text: #ffffff;
  --color-text-muted: #94a3b8;
  --color-text-light: #f1f5f9;
  --color-accent: #f59e0b;
  --color-accent-hover: #d97706;
  --color-danger: #ef4444;
  --color-success: #22c55e;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-hover: rgba(245, 158, 11, 0.4);
  --color-overlay: rgba(15, 23, 42, 0.85);
  
  /* ✨ Efectos & Sombras */
  --blur-glass: blur(16px) saturate(180%);
  --blur-soft: blur(8px);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(245, 158, 11, 0.2);
  --shadow-glow-hover: 0 0 50px rgba(245, 158, 11, 0.4);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.4);
  
  /* 📐 Layout & Espaciado */
  --container-max: 1280px;
  --container-padding: 1.5rem;
  --section-padding-y: 6rem;
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-2xl: 2.5rem;
  --radius-full: 9999px;
  
  /* 🔤 Tipografía */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Orbitron', sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.5rem;
  --text-display: clamp(3rem, 8vw, 8rem);
  
  /* ⚡ Animaciones & Transiciones */
  --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
  --ease-in: cubic-bezier(0.55, 0.085, 0.68, 0.53);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 800ms;
  --duration-enter: 1000ms;
  
  /* 🎯 Z-Index Layers */
  --z-base: 1;
  --z-nav: 100;
  --z-modal: 1000;
  --z-toast: 1100;
  --z-overlay: 999;
}

/* ========================================
   2. RESET & BASE STYLES
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: var(--text-base);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Selection */
::selection {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

/* Links */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast);
}

a:hover { color: var(--color-accent); }

/* Images */
img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Forms */
input, select, textarea, button {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

/* Lists */
ul, ol { list-style: none; }

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text-light);
}

/* ========================================
   3. UTILIDADES
   ======================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

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

.text-accent { color: var(--color-accent) !important; }
.text-center { text-align: center; }

/* Section Title with underline accent */
.section-title {
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 70px;
  height: 4px;
  background: linear-gradient(to right, var(--color-accent), var(--color-danger));
  border-radius: var(--radius-full);
}

/* Glassmorphism base */
.glass {
  background: var(--color-bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--color-border);
}

/* ========================================
   4. NAVBAR & MOBILE MENU
   ======================================== */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  z-index: calc(var(--z-nav) + 1);
  background: transparent;
  border-radius: var(--radius-sm);
}

.nav-toggle:hover { background: rgba(255,255,255,0.05); }

.nav-toggle-bar {
  width: 26px;
  height: 3px;
  background: var(--color-text);
  border-radius: 3px;
  transition: 
    transform var(--duration-normal) var(--ease-out),
    opacity var(--duration-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Desktop Navigation Links */
.nav-link {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text);
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--duration-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--duration-normal) var(--ease-smooth);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
}

.nav-link:hover { color: var(--color-accent); }
.nav-link:hover::after { width: 100%; }

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 85%;
  max-width: 360px;
  background: var(--color-bg-alt);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  z-index: calc(var(--z-nav) + 2);
  box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: var(--blur-soft);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.mobile-menu.active::before {
  opacity: 1;
}

.mobile-menu-content {
  position: relative;
  height: 100%;
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.mobile-menu-close {
  align-self: flex-end;
  font-size: 1.5rem;
  color: var(--color-text);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--duration-fast);
}

.mobile-menu-close:hover {
  background: rgba(255,255,255,0.1);
}

.mobile-menu-nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 3rem;
  flex: 1;
}

.mobile-menu-link {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--duration-fast);
}

.mobile-menu-link:hover {
  color: var(--color-accent);
}

.mobile-menu-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-top: auto;
  transition: all var(--duration-normal);
}

.mobile-menu-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

/* Responsive: Desktop */
@media (min-width: 768px) {
  .nav-toggle,
  .mobile-menu {
    display: none;
  }
}

/* ========================================
   5. BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  transition: all var(--duration-normal) var(--ease-smooth);
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  will-change: transform;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.25);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-text);
  transform: translateY(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  z-index: 0;
}

.btn-primary:hover::before {
  transform: translateY(0);
}

.btn-primary > * {
  position: relative;
  z-index: 1;
  transition: color var(--duration-fast);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow-hover);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 2px solid rgba(255,255,255,0.6);
  transition: all var(--duration-normal) var(--ease-smooth);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 1rem;
  font-weight: 600;
  transition: all var(--duration-normal);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-accent);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: var(--text-base);
}

.btn-xl {
  padding: 1.25rem 3rem;
  font-size: var(--text-lg);
}

.btn-arrow {
  transition: transform var(--duration-fast) var(--ease-out);
  display: inline-block;
  font-size: 1.1em;
}

.btn-primary:hover .btn-arrow {
  transform: translateX(5px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ========================================
   6. CARDS & COMPONENTS
   ======================================== */
.card {
  background: var(--color-bg-glass);
  backdrop-filter: var(--blur-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--duration-slow) var(--ease-smooth);
  will-change: transform;
}

.card-hover {
  transition: all var(--duration-slow) var(--ease-smooth);
}

.card-hover:hover {
  transform: translateY(-10px) scale(1.02);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow-hover);
}

/* ========================================
   7. HERO SECTION
   ======================================== */
.hero-bg {
  background: 
    linear-gradient(rgba(15, 23, 42, 0.75), rgba(15, 23, 42, 0.85)),
    url('https://picsum.photos/id/1015/2000/1200') center/cover no-repeat;
  min-height: 100vh;
  position: relative;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(245,158,11,0.1) 0%, transparent 50%);
  pointer-events: none;
}

/* Floating elements animation */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* Scroll indicator bounce */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.animate-bounce {
  animation: bounce 2s ease-in-out infinite;
}

/* ========================================
   8. ANIMATIONS & SCROLL REVEAL
   ======================================== */
[data-aos] {
  opacity: 0;
  transform: translateY(30px);
  transition: 
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
  will-change: opacity, transform;
}

[data-aos].active {
  opacity: 1;
  transform: translateY(0);
}

[data-aos="fade-right"] {
  transform: translateX(-30px);
}

[data-aos="fade-right"].active {
  transform: translateX(0);
}

[data-aos="fade-left"] {
  transform: translateX(30px);
}

[data-aos="fade-left"].active {
  transform: translateX(0);
}

[data-aos-delay="100"] { transition-delay: 100ms; }
[data-aos-delay="200"] { transition-delay: 200ms; }
[data-aos-delay="300"] { transition-delay: 300ms; }
[data-aos-delay="400"] { transition-delay: 400ms; }

/* Strength bar animation */
@keyframes fillBar {
  from { width: 0%; }
  to { width: 100%; }
}

.strength-bar {
  height: 6px;
  background: linear-gradient(to right, var(--color-accent), var(--color-danger));
  animation: fillBar 2s var(--ease-out) forwards;
  border-radius: var(--radius-full);
}

/* Pulse animation for status indicators */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* Glow animation for accents */
@keyframes glow {
  0% { box-shadow: 0 0 10px rgba(245, 158, 11, 0.3); }
  100% { box-shadow: 0 0 25px rgba(245, 158, 11, 0.6); }
}

.animate-glow {
  animation: glow 2s ease-in-out infinite alternate;
}

/* ========================================
   9. SECTIONS
   ======================================== */
section {
  padding: var(--section-padding-y) 0;
  position: relative;
}

/* Gradient backgrounds */
.bg-gradient-top {
  background: linear-gradient(to bottom, var(--color-bg), var(--color-bg-alt));
}

.bg-gradient-bottom {
  background: linear-gradient(to top, var(--color-bg), var(--color-bg-alt));
}

/* ========================================
   10. PRICING CARDS
   ======================================== */
.pricing-card {
  position: relative;
  transition: all var(--duration-slow) var(--ease-smooth);
}

.pricing-card.featured {
  border: 2px solid var(--color-accent);
  transform: scale(1.03);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  z-index: 2;
}

.pricing-card.featured::before {
  content: 'MÁS POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: var(--color-bg);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.375rem 1.25rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  white-space: nowrap;
  z-index: 3;
}

.pricing-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--color-border-hover);
}

.pricing-card.featured:hover {
  transform: translateY(-8px) scale(1.05);
}

.pricing-price {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1;
}

.pricing-price-sup {
  font-size: var(--text-2xl);
  vertical-align: super;
  margin-right: 0.25rem;
}

.pricing-features {
  list-style: none;
  margin: 2rem 0;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features i {
  color: var(--color-success);
  font-size: 0.875rem;
}

/* ========================================
   11. GALLERY GRID
   ======================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  display: block;
  transition: transform var(--duration-normal) var(--ease-smooth);
}

.gallery-item:hover {
  transform: scale(1.03);
  z-index: 2;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.gallery-item:hover img {
  transform: scale(1.1);
}

/* ========================================
   12. FOOTER
   ======================================== */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
  background: #000;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--duration-fast);
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* ========================================
   13. RESPONSIVE BREAKPOINTS
   ======================================== */
@media (min-width: 640px) {
  :root {
    --container-padding: 2rem;
    --section-padding-y: 8rem;
  }
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--text-6xl);
  }
  
  .section-title::after {
    left: 0;
    transform: none;
  }
}

@media (min-width: 1024px) {
  :root {
    --section-padding-y: 10rem;
  }
  
  .hero-title {
    font-size: var(--text-display);
  }
}

@media (min-width: 1280px) {
  .container {
    padding-inline: 3rem;
  }
}

/* ========================================
   14. ACCESSIBILITY & PREFERENCES
   ======================================== */
/* Focus visible for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
.nav-link:focus-visible,
.mobile-menu-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --color-text: #fff;
    --color-text-muted: #ddd;
    --color-border: rgba(255,255,255,0.5);
    --color-bg-glass: rgba(20, 30, 50, 0.95);
  }
  
  .btn-secondary,
  .btn-outline {
    border-color: rgba(255,255,255,0.8);
  }
  
  .glass {
    border-width: 2px;
  }
}

/* Reduced 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;
  }
  
  [data-aos] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  
  .card-hover:hover,
  .gallery-item:hover,
  .btn:hover {
    transform: none !important;
  }
}

/* Print styles */
@media print {
  .nav,
  .mobile-menu,
  .btn,
  [data-aos] {
    display: none !important;
  }
  
  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }
  
  section {
    padding: 2rem 0;
    page-break-inside: avoid;
  }
}

/* Dark mode enhancement for OLED */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a0f1a;
  }
}

/* ========================================
   15. PERFORMANCE OPTIMIZATIONS
   ======================================== */
/* GPU acceleration for animations */
.hero-bg,
.card-hover,
.gallery-item img,
.btn,
[data-aos] {
  will-change: transform, opacity;
  transform: translateZ(0);
}

/* Contain layout for complex components */
.card,
.pricing-card,
.gallery-item {
  contain: layout style paint;
}

/* Reduce repaint on scroll */
header,
.nav {
  will-change: transform, background;
}

/* Optimize image loading states */
img[loading="lazy"] {
  background: linear-gradient(90deg, var(--color-bg-alt) 25%, var(--color-bg) 50%, var(--color-bg-alt) 75%);
  background-size: 200% 100%;
  background-position: 200% 0;
  animation: shimmer 1.5s infinite;
}

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

img[src]:not([src=""]):not([loading="lazy"]) {
  animation: none;
  background: none;
}

/* ========================================
   16. UTILITY CLASSES (Tailwind-like)
   ======================================== */
/* Spacing */
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

/* Text utilities */
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.uppercase { text-transform: uppercase; }
.tracking-wider { letter-spacing: 0.05em; }

/* Display utilities */
.hidden { display: none; }
.block { display: block; }
.inline-flex { display: inline-flex; }

@media (min-width: 768px) {
  .md\:flex { display: flex; }
  .md\:hidden { display: none; }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ========================================
   17. DEBUG & DEVELOPMENT UTILS
   ======================================== */
/* Show when JS is loaded */
html:not(.js-loaded) [data-aos] {
  opacity: 1 !important;
  transform: none !important;
}

/* Visual debug for layout (remove in production) */
/*
* { outline: 1px solid rgba(245, 158, 11, 0.1) !important; }
*/