:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --text-muted: #555;
  --accent: #2abfbf;
  --accent-hover: #22a3a3;
  --card-bg: #f7f8fa;
  --border: #e5e7eb;
  --max-width: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --text: #e5e5e5;
    --text-muted: #999;
    --accent: #3dd6d6;
    --accent-hover: #2abfbf;
    --card-bg: #1a1a1a;
    --border: #333;
  }
}

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

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px;
}

section {
  margin-bottom: 60px;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 16px;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.hero {
  text-align: center;
  padding: 40px 0 60px;
}

.subtitle {
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 600;
  margin-top: 4px;
}

.tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta {
  display: inline-block;
  margin-top: 28px;
  padding: 12px 32px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.15s;
}

.cta:hover { background: var(--accent-hover); }

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}

@media (max-width: 520px) {
  .feature-grid { grid-template-columns: 1fr; }
}

.feature {
  padding: 20px;
  background: var(--card-bg);
  border-radius: 10px;
  border: 1px solid var(--border);
}

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

.privacy {
  padding: 28px;
  background: var(--card-bg);
  border-radius: 10px;
  border: 1px solid var(--border);
}

.privacy p {
  color: var(--text-muted);
  margin-bottom: 12px;
}

.privacy a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.privacy a:hover { text-decoration: underline; }

.donate {
  text-align: center;
}

.donate p {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.crypto-addresses {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.crypto-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.crypto-label {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent);
  min-width: 32px;
}

.crypto-row code {
  font-size: 0.75rem;
  word-break: break-all;
  color: var(--text-muted);
}

footer {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

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

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