:root {
  --bg: #0c1015;
  --panel: #161c25;
  --panel-2: #1f2733;
  --text: #e7edf3;
  --muted: #8b97a7;
  --accent: #7b61ff;
  --accent-2: #00d3a7;
  --border: #2a3340;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #1a2230, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.site-header {
  text-align: center;
  padding: 36px 16px 8px;
}
.site-header h1 { margin: 0; font-size: 30px; letter-spacing: 0.04em; }
.tagline { color: var(--muted); margin: 8px 0 0; }

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px;
}

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 22px;
}

.connect-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.or { color: var(--muted); font-size: 14px; }
.manual { display: flex; gap: 8px; flex: 1; min-width: 260px; }
.manual input {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 9px;
  padding: 10px 12px;
  font-size: 14px;
}

.options { margin-top: 16px; }
.options label { color: var(--muted); font-size: 14px; display: inline-flex; gap: 8px; align-items: center; }
.options select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 9px;
  padding: 8px 10px;
}

.btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 9px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
  transition: transform .05s ease, background .15s ease, opacity .15s;
}
.btn:hover { background: #28323f; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #5a43d6);
  border: none;
  font-weight: 600;
}
.btn-primary:hover { background: linear-gradient(135deg, #8b73ff, #6a52e6); }

.btn-sm { padding: 6px 12px; font-size: 13px; }

.relays {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.relays-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.relays-title { color: var(--muted); font-size: 14px; }
.relay-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}
.relay-input {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 9px;
  padding: 9px 12px;
  font-size: 13px;
}
.relay-del {
  width: 40px;
  padding: 0;
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
}
.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
  cursor: pointer;
}
.checkbox input { width: 16px; height: 16px; accent-color: var(--accent); }
.relays-note { color: var(--muted); font-size: 12px; margin: 8px 0 0; line-height: 1.5; }

.status { margin: 14px 0 0; color: var(--muted); font-size: 14px; min-height: 20px; }
.status.error { color: #ff7b7b; }
.status.ok { color: var(--accent-2); }

.preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
#license-canvas {
  width: 100%;
  max-width: 660px;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 18px 50px rgba(0,0,0,.5);
  background: #0a0d12;
}

.info {
  margin: 28px auto 60px;
  max-width: 660px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  color: var(--muted);
  font-size: 13px;
}
.info summary { cursor: pointer; color: var(--text); }
.info code { background: var(--panel-2); padding: 1px 6px; border-radius: 5px; }
.info ul { line-height: 1.7; }