/* ===== CSS Variables ===== */
:root {
  /* Primary Colors - Enhanced for dark theme */
  --primary-color: #a78bfa;
  --primary-dark: #8b5cf6;
  --primary-light: #c4b5fd;
  --secondary-color: #34d399;
  --secondary-dark: #10b981;
  --accent-color: #fbbf24;
  --accent-light: #fcd34d;
  
  /* Light theme colors (for reference) */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --black: #000000;
  
  /* Dark Theme Color System */
  --dark-bg: #0f172a;
  --dark-bg-secondary: #1e293b;
  --dark-bg-tertiary: #334155;
  --dark-surface: #1e293b;
  --dark-surface-hover: #334155;
  --dark-surface-secondary: #334155;
  --dark-text-primary: #f1f5f9;
  --dark-text-secondary: #cbd5e1;
  --dark-text-tertiary: #94a3b8;
  --dark-border: #334155;
  --dark-border-light: #475569;
  
  /* Status Colors - Optimized for dark theme */
  --success-color: #22c55e;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --info-color: #3b82f6;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* 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;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 80px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--dark-text-primary);
  background-color: var(--dark-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(0, 0, 0, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 1000;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.7);
  background: rgba(0, 0, 0, 1);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: var(--font-weight-bold);
  font-size: 1.5rem;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-brand i {
  font-size: 1.8rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  position: relative;
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-color);
  border-radius: 1px;
}

.nav-link.btn-primary {
  background: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.nav-link.btn-primary:hover {
  background: var(--primary-dark);
  color: var(--white);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

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

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

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

/* ===== Hero Section ===== */
.hero {
  padding: calc(var(--header-height) + var(--spacing-3xl)) var(--spacing-lg) var(--spacing-3xl);
  background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-secondary) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.hero-text h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  color: var(--dark-text-primary);
  margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--dark-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.stat {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.stat i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.stat div {
  display: flex;
  flex-direction: column;
}

.stat strong {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--dark-text-primary);
  line-height: 1;
}

.stat span {
  font-size: 0.9rem;
  color: var(--dark-text-secondary);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-lg);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.dashboard-preview {
  position: relative;
  width: 100%;
  max-width: 400px;
}

.preview-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--gray-200);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.card-header i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.card-header h3 {
  font-size: 1.1rem;
  font-weight: var(--font-weight-semibold);
  color: var(--gray-800);
}

.progress-bars {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.progress-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.progress-item span {
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
  min-width: 60px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
  border-radius: var(--radius-sm);
  transition: width var(--transition-slow);
}

/* ===== Sections ===== */
section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: var(--font-weight-bold);
  color: var(--dark-text-primary);
  margin-bottom: var(--spacing-md);
}

.section-header p {
  font-size: 1.1rem;
  color: var(--dark-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Features Section ===== */
.features {
  background: var(--dark-bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--dark-surface);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--dark-border);
  transition: all var(--transition-normal);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
  background: var(--dark-surface-hover);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
}

.feature-icon i {
  font-size: 1.5rem;
  color: var(--white);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--dark-text-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-card p {
  color: var(--dark-text-secondary);
  line-height: 1.7;
}

/* ===== Pricing Section ===== */
.pricing {
  background: var(--dark-bg-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  background: var(--dark-surface);
  border: 2px solid var(--dark-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-normal);
  color: var(--dark-text-primary);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.popular {
  border-color: var(--primary-color);
  transform: scale(1.05);
  background: var(--dark-surface-hover);
  box-shadow: 0 0 30px rgba(167, 139, 250, 0.2);
}

.pricing-card.popular::before {
  content: 'Most Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
}

.plan-badge {
  font-size: 1.1rem;
  font-weight: var(--font-weight-semibold);
  color: var(--dark-text-primary);
  margin-bottom: var(--spacing-lg);
}

.plan-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.currency {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  color: var(--dark-text-secondary);
}

.amount {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  text-shadow: 0 0 10px rgba(167, 139, 250, 0.3);
}

.period {
  font-size: 1rem;
  color: var(--dark-text-secondary);
  margin-left: var(--spacing-xs);
}

.plan-features {
  list-style: none;
  margin-bottom: var(--spacing-xl);
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
}

.plan-features i.fa-check {
  color: var(--success-color);
}

.plan-features i.fa-times {
  color: var(--dark-text-tertiary);
}

/* ===== Registration Section ===== */
.registration {
  background: var(--dark-bg);
}

.registration-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.registration-info h2 {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
  margin-bottom: var(--spacing-lg);
}

.registration-info > p {
  font-size: 1.1rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-xl);
}

.testimonial {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.testimonial-content p {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--gray-700);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.testimonial-author strong {
  color: var(--gray-900);
  display: block;
}

.testimonial-author span {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.registration-form-container {
  display: flex;
  justify-content: center;
}

.form-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-2xl);
  width: 100%;
  max-width: 400px;
}

.form-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.form-header h3 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.form-header p {
  color: var(--gray-600);
}

/* ===== Account Type Selector ===== */
.account-type-selector {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-md) 0;
}

.toggle-group {
  display: flex;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
}

.toggle-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  color: var(--gray-600);
  font-weight: var(--font-weight-medium);
  position: relative;
}

.toggle-btn:hover {
  background: var(--gray-50);
  color: var(--gray-700);
}

.toggle-btn.active {
  background: var(--primary-color);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.toggle-btn.active:hover {
  background: var(--primary-dark);
  color: var(--white);
}

.toggle-btn i {
  font-size: 1.1rem;
}

.toggle-btn span {
  font-size: 0.9rem;
}

/* Form field animations */
.trainer-field {
  transition: all var(--transition-normal);
  overflow: hidden;
}

.trainer-field.show {
  display: block !important;
  animation: slideDown var(--transition-normal) ease-out;
}

.trainer-field.hide {
  animation: slideUp var(--transition-normal) ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    max-height: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    max-height: 200px;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 1;
    max-height: 200px;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    max-height: 0;
    transform: translateY(-10px);
  }
}

/* ===== Footer ===== */
.footer {
  background: #000000;
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: var(--font-weight-bold);
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.footer-brand i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.footer-section p {
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: #ffffff;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-lg);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--primary-color);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-links a {
  width: 40px;
  height: 40px;
  background: var(--gray-800);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
}

.contact-info p {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.contact-info i {
  color: var(--primary-color);
  width: 16px;
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  color: rgba(255, 255, 255, 0.6);
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl);
  max-width: 400px;
  width: 90%;
  text-align: center;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-header {
  margin-bottom: var(--spacing-lg);
}

.modal-header i {
  font-size: 3rem;
  color: var(--success-color);
  margin-bottom: var(--spacing-md);
}

.modal-header h3 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
}

.modal-body p {
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .hero-content,
  .registration-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .hero-visual {
    order: -1;
  }
  
  .hero-text {
    text-align: center;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero {
    padding-top: calc(var(--header-height) + var(--spacing-2xl));
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-stats {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .features-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.popular {
    transform: none;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .form-card {
    padding: var(--spacing-lg);
  }
  
  .hero-text h1 {
    font-size: 2.5rem;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
}