:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

body {
  margin: 0;
  background: #0b1020;
  color: #e5e7eb;
}

.app {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  margin: 0;
}

h2 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.sub {
  color: #9ca3af;
  margin: 6px 0 0;
}

.panel {
  border: 1px solid #1f2937;
  border-radius: 14px;
  padding: 16px;
  margin-top: 14px;
  background: #111827;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

button {
  border: 1px solid #2563eb;
  background: #1d4ed8;
  color: white;
  border-radius: 10px;
  padding: 10px 14px;
  margin-right: 8px;
  cursor: pointer;
}

input[type='text'],
input[type='file'] {
  display: block;
  width: 100%;
  margin-top: 6px;
  border: 1px solid #374151;
  background: #0f172a;
  color: #e5e7eb;
  border-radius: 8px;
  padding: 8px;
  box-sizing: border-box;
}

.flash-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.checkline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
}

progress {
  width: 100%;
  margin-top: 12px;
  height: 10px;
}

button:hover {
  filter: brightness(1.06);
}

#logs {
  max-height: 260px;
  overflow: auto;
  white-space: pre-wrap;
  color: #d1d5db;
  margin: 0;
}

@media (max-width: 740px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .flash-grid {
    grid-template-columns: 1fr;
  }
}