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

:root {
  --primary-color: #cfcfcf;
  --secondary-color: #34d399;
  --light-bg: #111214;
  --surface-bg: #1a1b1f;
  --surface-soft: #24262c;
  --white: #f5f5f5;
  --text: #f0f0f0;
  --text-muted: #b0b3bb;
  --border: #353841;
  --shadow-md: 0 8px 18px -4px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 18px 30px -8px rgba(0, 0, 0, 0.55);
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 16px;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 10%, #2b2d34 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, #1f2025 0%, transparent 45%),
    var(--light-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, #0f1013, #21242a);
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--white);
}

.brand__logo {
  border-radius: 14px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.brand__name {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.9rem 1.75rem;
  font-size: 1.05rem;
}

.btn-primary {
  background: linear-gradient(135deg, #d1d5db, #9ca3af);
  color: #111214;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: #2a2d34;
  color: var(--white);
  border: 1px solid #444955;
}

.btn-secondary:hover {
  background: #343944;
  border-color: #5c606c;
}

/* Hero */
.hero {
  position: relative;
  padding: 4rem 1.5rem 5rem;
  overflow: hidden;
}

.hero__glow {
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(52, 211, 153, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.hero__icon {
  border-radius: 24px;
  margin-bottom: 1.25rem;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.hero__badge {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: #a7f3d0;
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.35);
  border-radius: 999px;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, #b0b3bb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.hero__meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Features */
.features {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.features h2,
.install h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--text);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.card {
  background: linear-gradient(165deg, #1f2127, #17181c);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.25rem;
  text-align: center;
  transition: all 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: #8a8f9d;
  box-shadow: var(--shadow-lg);
}

.card__icon-wrap {
  width: 74px;
  height: 74px;
  margin: 0 auto 1rem;
  border-radius: 18px;
  background: linear-gradient(145deg, #2c2f37, #1f2127);
  border: 1px solid #3a3d46;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

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

/* Install */
.install {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  text-align: center;
}

.install__steps {
  text-align: left;
  margin: 0 auto 1.5rem;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.install__steps li {
  margin-bottom: 0.65rem;
}

.install__steps strong {
  color: var(--text);
}

/* Footer */
.footer {
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer__credit {
  margin-top: 0.35rem;
  font-size: 0.8rem;
  opacity: 0.85;
}

@media (max-width: 600px) {
  .header__inner {
    padding: 0.75rem 1rem;
  }

  .brand__name {
    font-size: 1.1rem;
  }

  .hero {
    padding: 2.5rem 1rem 3rem;
  }

  .hero__icon {
    width: 96px;
    height: 96px;
  }
}