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

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #f6f7fb;
  color: #222;
}

.container {
  max-width: 1080px;
  margin: 20px auto;
  padding: 0 14px 20px;
}

h1 { margin: 0 0 8px; }

h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

.hint {
  margin: 0 0 12px;
  color: #666;
}

.page-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 12px;
}

.card {
  background: #fff;
  border: 1px solid #e6e8ef;
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.row {
  margin-bottom: 10px;
}

.sep {
  display: inline-block;
  margin: 0 6px;
  color: #9ca3af;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.inline-note {
  align-self: center;
  color: #666;
  font-size: 0.92rem;
}

button {
  border: 1px solid #ccd3e0;
  border-radius: 10px;
  background: #fff;
  padding: 9px 14px;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

button.primary {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
}

.interval-row {
  display: grid;
  grid-template-columns: 1fr minmax(160px, 1fr) 110px;
  gap: 10px;
  align-items: center;
}

#intervalInput {
  width: 100%;
  padding: 6px 8px;
}

#preview {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 55dvh;
  margin: 0 auto;
  background: #0f172a;
  border-radius: 10px;
  object-fit: contain;
}

.hidden {
  display: none;
}

.stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.status pre {
  margin: 8px 0 0;
  background: #f3f4f6;
  border-radius: 8px;
  padding: 10px;
  min-height: 120px;
  max-height: 52dvh;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 860px) {
  .page-grid {
    grid-template-columns: 1fr;
  }

  .interval-row {
    grid-template-columns: 1fr;
  }

  .container {
    margin: 12px auto;
  }

  #preview {
    max-height: 44dvh;
  }

  .status pre {
    max-height: 32dvh;
  }
}