:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --border: #d9dfe4;
  --text: #1f2a33;
  --muted: #5a6b76;
  --accent: #1a6fb0;
  --accent-dark: #14567f;
  --warn-bg: #fff4e5;
  --warn-border: #e8a33d;
  --danger: #b23b3b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

#demo-banner {
  background: #7a1f1f;
  color: #fff;
  text-align: center;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

#app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand { font-weight: 700; font-size: 18px; }
#step-indicator { color: var(--muted); font-size: 14px; }

#app {
  max-width: 720px;
  margin: 24px auto;
  padding: 0 16px 60px;
}

.screen {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}

.screen.hidden { display: none; }
.hidden { display: none !important; }

h1 { font-size: 20px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 24px 0 8px; }

label {
  display: block;
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
}

label.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}
label.checkbox-row input { width: auto; }

input[type="text"], textarea {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  resize: vertical;
}

input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.actions { margin-top: 18px; }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--accent-dark); }
button:disabled { background: #a7b4bc; cursor: not-allowed; }

.hint { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.error { color: var(--danger); font-size: 14px; margin-top: 10px; min-height: 1em; }

.sources { margin-top: 10px; font-size: 14px; }
.sources ul { margin: 6px 0 0; padding-left: 20px; }

#rs-warnings { list-style: none; margin: 0 0 14px; padding: 0; }
#rs-warnings li {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 14px;
}

.version-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 12px;
  font-size: 14px;
}
.version-card.current { border-color: var(--accent); background: #eef6fc; }
.version-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 8px;
  background: var(--accent);
  color: #fff;
}
.version-card dl { margin: 8px 0 0; }
.version-card dt { font-weight: 600; color: var(--muted); margin-top: 8px; }
.version-card dd { margin: 2px 0 0; white-space: pre-wrap; }

@media (max-width: 600px) {
  #app { margin: 12px auto; padding: 0 10px 40px; }
  .screen { padding: 16px; }
  #app-header { padding: 10px 14px; }
}