:root {
  --bg: #0f1115;
  --card: #181b22;
  --fg: #e8eaed;
  --muted: #9aa0aa;
  --accent: #2ecc71;
  --accent-press: #27ae60;
  --border: #2a2f3a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}
.app {
  max-width: 540px;
  margin: 0 auto;
  padding: 24px 16px calc(24px + env(safe-area-inset-bottom));
}
header { text-align: center; margin-bottom: 20px; }
h1 { margin: 0; font-size: 2rem; letter-spacing: -0.5px; }
.tagline { color: var(--muted); margin: 4px 0 0; }
form { display: flex; flex-direction: column; gap: 14px; }
.file-drop {
  display: block;
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 28px 16px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
}
.file-drop input { display: none; }
.row { display: flex; gap: 12px; }
.row label { flex: 1; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; color: var(--muted); }
select, input[type="number"] {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-size: 1rem;
}
.check { flex-direction: row; align-items: center; gap: 8px; color: var(--fg); }
.legal { align-items: flex-start; font-size: 0.8rem; color: var(--muted); line-height: 1.4; }
.legal input { margin-top: 2px; }
button {
  background: var(--accent);
  color: #06210f;
  border: 0;
  border-radius: 12px;
  padding: 14px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
}
button:active { background: var(--accent-press); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.status {
  margin-top: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}
.status.hidden { display: none; }
.status a { color: var(--accent); font-weight: 600; }
.err { color: #ff6b6b; white-space: pre-wrap; }
.dl-btn {
  display: inline-block;
  background: var(--accent);
  color: #06210f !important;
  border-radius: 12px;
  padding: 12px 20px;
  text-decoration: none;
  margin: 4px 0 8px;
}
.howto {
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  background: var(--bg);
}
.howto summary { cursor: pointer; font-weight: 600; color: var(--fg); }
.howto ol { margin: 10px 0 6px; padding-left: 20px; color: var(--fg); font-size: 0.9rem; line-height: 1.5; }
.howto code { background: var(--card); padding: 1px 5px; border-radius: 5px; }
.howto-note { color: var(--muted); font-size: 0.78rem; margin: 6px 0 0; line-height: 1.4; }
.spinner {
  width: 18px; height: 18px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--accent);
  display: inline-block; vertical-align: middle; margin-right: 8px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.ad-wrap {
  margin-top: 24px;
  border-radius: 10px;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  min-height: 90px;
}
footer {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
footer p { margin: 0; color: var(--muted); font-size: 0.85rem; }
.donate-btn {
  display: inline-block;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.donate-btn:hover { border-color: var(--accent); color: var(--accent); }
.footer-note { font-size: 0.78rem !important; }