```css
/* ==========================================================================
   PREMIUM GYM WEBSITE - COMPLETE CSS
   Dark Theme with Premium Accents & Advanced Animations
   ========================================================================== */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ========================================================================== */

:root {
  /* Primary Colors */
  --color-primary: #ff6b35;
  --color-primary-light: #ff8559;
  --color-primary-dark: #e55a2b;
  --color-primary-gradient: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
  
  /* Secondary Colors */
  --color-secondary: #00d4ff;
  --color-secondary-light: #33ddff;
  --color-secondary-dark: #00bde6;
  --color-secondary-gradient: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
  
  /* Neutral Colors */
  --color-dark-primary: #0a0a0a;
  --color-dark-secondary: #1a1a1a;
  --color-dark-tertiary: #2a2a2a;
  --color-dark-light: #3a3a3a;
  --color-gray-dark: #4a4a4a;
  --color-gray: #6a6a6a;
  --color-gray-light: #8a8a8a;
  --color-white: #ffffff;
  --color-white-soft: #f8f8f8;
  
  /* Accent Colors */
  --color-gold: #ffd700;
  --color-gold-gradient: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
  --color-success: #00ff88;
  --color-warning: #ffaa00;
  --color-error: #ff4444;
  
  /* Background Gradients */
  --bg-gradient-primary: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #2a2a2a 100%);
  --bg-gradient-secondary: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
  --bg-gradient-hero: linear-gradient(135deg, rgba(10, 10, 10, 0.9) 0%, rgba(26, 26, 26, 0.8) 50%, rgba(42, 42, 42, 0.9) 100%);
  
  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-backdrop: blur(20px);
  
  /* Shadows */
  --shadow-small: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 5px 25px rgba(0, 0, 0, 0.4);
  --shadow-large: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(255, 107, 53, 0.3);
  --shadow-glow-secondary: 0 0 30px rgba(0, 212, 255, 0.3);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Montserrat', 'Inter', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 4rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) var(--color-dark-tertiary);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-dark-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary-gradient);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-light);
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-white);
  background: var(--bg-gradient-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-gray-light);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
  text-shadow: 0 0 10px var(--color-primary);
}

/* ==========================================================================
   LAYOUT UTILITIES
   ========================================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-fluid {
  max-width: 100%;
  padding: 0 var(--spacing-md);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -var(--spacing-sm);
}

.col {
  flex: 1;
  padding: 0 var(--spacing-sm);
}

.col-6 { flex: 0 0 50%; }
.col-4 { flex: 0 0 33.333333%; }
.col-3 { flex: 0 0 25%; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--spacing-md) 0;
  background: rgba(10, 10, 10, 0.1);
  backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition-normal);
}

.navbar.scrolled {
  padding: var(--spacing-sm) 0;
  background: rgba(10, 10, 10, 0.95);
  box-shadow: var(--shadow-medium);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--color-white);
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.nav-link {
  color: var(--color-white);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  transition: var(--transition-normal);
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--color-primary-gradient);
  transition: var(--transition-normal);
  z-index: -1;
}

.nav-link:hover::before,
.nav-link.active::before {
  left: 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-white);
  transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: var(--spacing-sm);
  gap: 4px;
}

.mobile-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-sm);
  transition: var(--transition-normal);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, rgba(10, 10, 10, 0.7) 0%, rgba(26, 26, 26, 0.5) 100%),
              url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><pattern id="gym-pattern" x="0" y="0" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="2" fill="%23ff6b35" opacity="0.1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23gym-pattern)"/></svg>');
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-gradient-hero);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--spacing-md);
}

.hero-title {
  font-size: var(--font-size-6xl);
  font-weight: 900;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-primary) 50%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-gray-light);
  margin-bottom: var(--spacing-2xl);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.4s both;
}

/* Floating Elements */
.hero-float-1,
.hero-float-2,
.hero-float-3 {
  position: absolute;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-backdrop);
  border-radius: var(--radius-xl);
  padding: var(--spacing-md);
  animation: float 6s ease-in-out infinite;
}

.hero-float-1 {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.hero-float-2 {
  top: 60%;
  right: 10%;
  animation-delay: 2s;
}

.hero-float-3 {
  bottom: 20%;
  left: 15%;
  animation-delay: 4s;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition-normal);
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition-slow);
  z-index: -1;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--color-primary-gradient);
  color: var(--color-white);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 40px rgba(255, 107, 53, 0.5);
  color: var(--color-white);
}

.btn-secondary {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background: var(--color-secondary-gradient);
  color: var(--color-white);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow-secondary);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary-gradient);
  color: var(--color-white);
  transform: translateY(-3px);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   CARDS & GLASSMORPHISM
   ========================================================================== */

.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-backdrop);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-medium);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-primary-gradient);
  transform: translateX(-100%);
  transition: var(--transition-normal);
}

.card:hover::before {
  transform: translateX(0);
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-large);
  border-color: rgba(255, 107, 53, 0.3);
}

.card-header {