:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --bg-color: #F8FAFC;
  --surface: #FFFFFF;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
}

* {
  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;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: bold;
  font-size: 1.25rem;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background-color: var(--primary);
}

nav a {
  text-decoration: none;
  color: var(--text-muted);
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

main {
  flex: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 4rem;
}

.hero h1 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.card h2 {
  margin-bottom: 1rem;
  color: var(--text-main);
}

h1, h2, h3 {
  margin-bottom: 1rem;
}

ul {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

footer {
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.footer-links {
  margin-bottom: 1rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

@media (max-width: 600px) {
  header {
    flex-direction: column;
    gap: 1rem;
  }
  nav a {
    margin: 0 0.75rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
}

.play-store-btn {
  display: inline-flex;
  align-items: center;
  background-color: #000;
  color: #fff;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 8px;
  gap: 16px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.play-store-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0,0,0,0.2);
}
.play-store-btn span {
  display: flex;
  flex-direction: column;
  text-align: left;
}
.play-store-btn small {
  font-size: 0.65rem;
  letter-spacing: 0.5px;
}
.play-store-btn strong {
  font-size: 1.25rem;
  line-height: 1.1;
}

.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.mode-item {
  background: var(--bg-color);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.mode-item h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}