* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: #0f172a;
  color: #f8fafc;
  padding: 16px;
  max-width: 650px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  font-size: 1.6rem;
  color: #38bdf8;
  letter-spacing: 0.5px;
}

header p {
  font-size: 0.85rem;
  color: #94a3b8;
  margin-top: 4px;
}

.card {
  background: #1e293b;
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: #e2e8f0;
}

.status-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 20px;
  font-weight: bold;
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.status-badge.disconnected {
  background-color: #7f1d1d;
  color: #fca5a5;
}

.status-badge.connected {
  background-color: #14532d;
  color: #86efac;
}

.button-group {
  display: flex;
  gap: 10px;
}

.btn {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn.primary { background-color: #0284c7; color: white; }
.btn.danger { background-color: #dc2626; color: white; }
.btn.secondary { background-color: #475569; color: white; width: 100%; }
.btn.success { background-color: #16a34a; color: white; width: 100%; margin-top: 10px; font-size: 1.05rem; }

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: #cbd5e1;
}

input[type="file"], textarea {
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #334155;
  background-color: #0f172a;
  color: #ffffff;
  font-size: 0.95rem;
}

textarea {
  resize: vertical;
}

.checkbox-group {
  margin: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
}

.preview-container {
  max-width: 100%;
  max-height: 420px;
  overflow: auto;
  background: #000;
  border-radius: 6px;
  padding: 8px;
  text-align: center;
  margin-top: 10px;
  border: 1px solid #334155;
}

#previewCanvas {
  max-width: 100%;
  height: auto;
  background: #fff;
}

.log-box {
  background-color: #090d16;
  border: 1px solid #334155;
  border-radius: 6px;
  padding: 10px;
  font-family: monospace;
  font-size: 0.8rem;
  max-height: 120px;
  overflow-y: auto;
  color: #38bdf8;
  white-space: pre-wrap;
}