:root {
  --color-bg: #0f172a;
  --color-bg-light: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-primary: #38bdf8;
  --color-primary-dark: #0284c7;
  --color-accent: #a78bfa;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --max-width: 960px;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --radius: 12px;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
}

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

/* header */
header {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-bg-light);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

nav {
  display: flex;
  gap: var(--spacing-md);
}

nav a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

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

/* hero section */
.hero {
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero-icon {
  width: 120px;
  height: 120px;
  border-radius: 24px;
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 8px 32px rgba(56, 189, 248, 0.2);
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

/* breathing animation */
.breathing-circle {
  width: 160px;
  height: 160px;
  margin: var(--spacing-lg) auto;
  border-radius: 50%;
  background: radial-gradient(circle,
    rgba(56, 189, 248, 0.3) 0%,
    rgba(56, 189, 248, 0.1) 50%,
    transparent 70%);
  animation: breathe 8s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.2);
    opacity: 1;
  }
}

/* store badges */
.store-badges {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.store-badge {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-light);
  border: 1px solid var(--color-text-muted);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.store-badge:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* features section */
.features {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-light);
}

.features h2 {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: var(--spacing-lg);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  padding: var(--spacing-lg);
  background: var(--color-bg);
  border-radius: var(--radius);
  text-align: center;
}

.feature-card .icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* content pages */
.content {
  padding: var(--spacing-xl) 0;
}

.content h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-lg);
}

.content h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.content p,
.content ul,
.content ol {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-muted);
}

.content ul,
.content ol {
  padding-left: var(--spacing-lg);
}

.content li {
  margin-bottom: var(--spacing-sm);
}

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

/* support page */
.contact-info {
  background: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-lg);
}

.contact-info a {
  font-size: 1.125rem;
}

.faq-item {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-bg-light);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.faq-item p {
  margin-bottom: 0;
}

/* footer */
footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-bg-light);
  text-align: center;
}

footer nav {
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

footer .copyright {
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

/* responsive */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1rem;
  }

  .breathing-circle {
    width: 120px;
    height: 120px;
  }

  nav {
    gap: var(--spacing-sm);
  }
}