:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: #334155;
  --accent: #38bdf8;
}

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

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  background-color: rgba(15, 23, 42, 0.85);
  z-index: 50;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
  padding: 5rem 0 3rem;
  text-align: center;
}

.app-icon {
  width: 96px;
  height: 96px;
  border-radius: 22%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.4);
  font-size: 2.5rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 9999px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background-color: var(--card-bg);
}

/* Features */
.features {
  padding: 4rem 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  padding: 1.75rem;
  border-radius: 12px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--accent);
}

.card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
  color: var(--accent);
}

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

/* Document content (Privacy Policy / Terms) */
.doc-content {
  padding: 3rem 0;
  max-width: 800px;
  margin: 0 auto;
}

.doc-content h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.doc-meta {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-size: 0.9rem;
}

.doc-content h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.doc-content p, .doc-content ul {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.doc-content ul {
  padding-left: 1.5rem;
}

.doc-content li {
  margin-bottom: 0.5rem;
}

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

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  margin-top: 4rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: underline;
}

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