:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #121936;
  --text: #ebf0ff;
  --accent: #6ea8fe;
  --border: #2f3f7a;
}

* {
  box-sizing: border-box;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, #162147, var(--bg));
  color: var(--text);
}

.topbar,
footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 1rem;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1rem;
}

.panel {
  background: color-mix(in srgb, var(--panel) 90%, black);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
}

.settings label {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

input,
select,
textarea,
button {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0d1530;
  color: var(--text);
  padding: 0.65rem;
}

button {
  background: linear-gradient(90deg, #3857dc, #5b8cff);
  border: 0;
  cursor: pointer;
  font-weight: 700;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab {
  opacity: 0.65;
}

.tab.active {
  opacity: 1;
  outline: 2px solid var(--accent);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.output {
  min-height: 150px;
  white-space: pre-wrap;
  background: #070d1f;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid #1f2d63;
}

.hint {
  font-size: 0.85rem;
  opacity: 0.8;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}


.inline-control {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.inline-control input[type="checkbox"] {
  width: auto;
}