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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.back-link {
  position: fixed;
  top: 11px;
  left: 20px;
  z-index: 100;
  display: flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.08);
  color: var(--muted);
  text-decoration: none;
  transition: background 0.18s, color 0.18s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

@media (hover: hover) {
  .back-link:hover {
    background: rgba(var(--accent-rgb), 0.18);
    color: var(--accent);
  }
}

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.1);
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-logo {
  padding-left: 56px;
  background: var(--gradient);
  background-clip: text;
  -webkit-background-clip: text;
  font-size: 1.2rem;
  font-weight: 700;
  text-decoration: none;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a,
.footer-links a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.18s;
}

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

.nav-download,
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-radius: 50px;
  background: var(--gradient);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.18s, transform 0.18s;
}

.nav-download {
  padding: 8px 18px;
  font-size: 0.85rem;
  white-space: nowrap;
}

.hero-cta {
  padding: 14px 28px;
  box-shadow: 0 8px 30px rgba(var(--hero-shadow-rgb), 0.35);
  font-size: 1rem;
}

.nav-download:hover,
.hero-cta:hover {
  opacity: 0.88;
}

.nav-download:hover {
  transform: translateY(-1px);
}

.hero-cta:hover {
  transform: translateY(-2px);
}

.hero {
  display: flex;
  min-height: calc(100vh - 64px);
  max-width: 1100px;
  align-items: center;
  gap: 60px;
  margin: 0 auto;
  padding: 80px 24px;
}

.hero-text {
  flex: 1;
}

.hero-badge {
  display: inline-block;
  margin-bottom: 24px;
  padding: 6px 14px;
  border-radius: 50px;
  background: var(--surface2);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero h1,
.tagline span {
  background: var(--gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero h1 {
  margin-bottom: 20px;
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
}

.hero p {
  max-width: 480px;
  margin-bottom: 36px;
  color: var(--text);
  font-size: 1.1rem;
  line-height: 1.7;
  opacity: 0.8;
}

.hero-img {
  display: flex;
  flex: 0 0 280px;
  justify-content: center;
}

.hero-img img {
  width: 220px;
  height: 220px;
  border-radius: 40px;
  box-shadow: 0 20px 60px rgba(var(--hero-shadow-rgb), 0.3), 0 4px 16px rgba(0, 0, 0, 0.12);
}

.tagline {
  padding: 32px 24px;
  border-top: 1px solid rgba(var(--accent-rgb), 0.08);
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.08);
  background: var(--surface);
  text-align: center;
}

.tagline span {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.features {
  max-width: 1100px;
  margin: 0 auto;
  padding: 100px 24px;
}

.features-header {
  margin-bottom: 64px;
  text-align: center;
}

.features-header h2 {
  margin-bottom: 12px;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
}

.features-header p {
  max-width: 480px;
  margin: 0 auto;
  color: var(--text);
  font-size: 1rem;
  opacity: 0.7;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px 28px;
  border: 1px solid rgba(var(--accent-rgb), 0.1);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(var(--hero-shadow-rgb), 0.15);
}

.feature-icon {
  display: flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border-radius: 14px;
  background: var(--gradient);
  font-size: 1.4rem;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 1.05rem;
  font-weight: 700;
}

.feature-card p {
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.65;
  opacity: 0.75;
}

footer {
  padding: 40px 24px;
  border-top: 1px solid rgba(var(--accent-rgb), 0.08);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

.footer-with-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: auto;
    flex-direction: column;
    gap: 40px;
    padding: 48px 20px;
    text-align: center;
  }

  .hero p {
    margin: 0 auto 36px;
  }

  .hero-img {
    flex: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition-duration: 0.01ms !important;
  }
}