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

:root {
  --primary: #f97316;
  --primary-glow: rgba(249, 115, 22, 0.5);
  --bg: #0a0a0a;
  --bg-secondary: #111;
  --surface: #1a1a1a;
  --text: #fff;
  --text-muted: #888;
  --border: rgba(255, 255, 255, 0.08);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: #ea580c;
  transform: translateY(-2px);
  box-shadow: 0 10px 40px var(--primary-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1rem;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 650px;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--text);
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.features {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.features h2, .exercises h2 {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

.section-desc {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 60px;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.feature.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature:hover {
  border-color: rgba(249, 115, 22, 0.3);
  box-shadow: 0 0 40px rgba(249, 115, 22, 0.1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(249, 115, 22, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.feature h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.exercises {
  padding: 120px 0;
}

.exercise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 60px;
}

.exercise-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.exercise-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.exercise-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: rgba(249, 115, 22, 0.3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.exercise-img {
  height: 180px;
  overflow: hidden;
  background: #222;
}

.exercise-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.exercise-card:hover .exercise-img img {
  transform: scale(1.1);
}

.exercise-info {
  padding: 20px;
}

.exercise-info h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.exercise-info span {
  font-size: 0.85rem;
  color: var(--primary);
}

.footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.copyright {
  margin-top: 8px;
  font-size: 0.8rem !important;
}

@media (max-width: 768px) {
  .nav-links a:not(.btn) {
    display: none;
  }
  
  .hero {
    padding-top: 160px;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .features, .exercises {
    padding: 80px 0;
  }
}