:root {
  --bg:           #1a1a1a;
  --surface:      #242424;
  --border:       #333;
  --text:         #e0e0e0;
  --subtle:       #888;
  --accent:       #0078d4;
  --accent-hover: #1a8ee0;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- Header ---- */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -.3px;
}

.lang-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--subtle);
  padding: .25rem .65rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: .8rem;
  font-family: inherit;
  transition: border-color .15s, color .15s;
}
.lang-btn:hover { border-color: var(--accent); color: var(--text); }

/* ---- Main ---- */

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
  padding: 5rem 1.5rem 4rem;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

/* ---- Hero ---- */

.hero { text-align: center; }

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: .9rem;
}

.hero p {
  color: var(--subtle);
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto;
}

/* ---- Features ---- */

.features {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem .75rem;
  width: 100%;
}

.features li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .7rem 1rem;
  font-size: .88rem;
  color: var(--subtle);
}

.features li::before {
  content: "✓  ";
  color: var(--accent);
  font-weight: 700;
}

/* ---- CTA ---- */

.cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.cta iframe {
  border-radius: 8px;
  overflow: hidden;
}

.btn-donate {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: .9rem 2.4rem;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  transition: background .15s, transform .1s;
}
.btn-donate:hover { background: var(--accent-hover); transform: translateY(-1px); }

.btn-free {
  color: var(--subtle);
  font-size: .88rem;
  text-decoration: none;
  transition: color .15s;
}
.btn-free:hover { color: var(--text); }

/* ---- Compat note ---- */

.compat {
  color: #555;
  font-size: .8rem;
  text-align: center;
}

/* ---- Responsive ---- */

@media (max-width: 480px) {
  .features { grid-template-columns: 1fr; }
  main { padding: 3rem 1.25rem 2.5rem; }
}