:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1f2733;
  --muted: #6b7686;
  --primary: #4f6ef7;
  --primary-d: #3a55d9;
  --line: #e4e8f0;
  --in: #eef2ff;
  --out: #f0fbf4;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

.site-header {
  background: linear-gradient(135deg, #4f6ef7 0%, #7a5cf0 100%);
  color: #fff;
  padding: 22px 24px;
  box-shadow: 0 4px 18px rgba(79, 110, 247, 0.25);
}
.brand { display: flex; align-items: center; gap: 14px; max-width: 1100px; margin: 0 auto; }
.logo { font-size: 34px; }
.site-header h1 { margin: 0; font-size: 22px; font-weight: 700; }
.subtitle { margin: 2px 0 0; font-size: 13px; opacity: 0.9; }

.container { max-width: 1100px; margin: 24px auto; padding: 0 18px; }

.editors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 10px rgba(20, 30, 60, 0.04);
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--line);
}
.badge { font-weight: 600; font-size: 14px; padding: 3px 10px; border-radius: 999px; }
.badge.in { background: var(--in); color: var(--primary-d); }
.badge.out { background: var(--out); color: #1f9d55; }
.hint { font-size: 12px; color: var(--muted); }

textarea {
  width: 100%;
  min-height: 380px;
  border: 0;
  resize: vertical;
  padding: 14px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  background: #fbfcff;
  outline: none;
}
#output { background: #f7fdf9; color: #14361f; }

.toolbar {
  display: flex; align-items: center; gap: 12px;
  margin: 18px 0 14px; flex-wrap: wrap;
}
.btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn:hover { border-color: var(--primary); color: var(--primary-d); }
.btn.primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
  font-weight: 600;
}
.btn.primary:hover { background: var(--primary-d); color: #fff; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
kbd {
  background: rgba(255, 255, 255, 0.25);
  border-radius: 5px; padding: 1px 6px; font-size: 11px;
}
.btn:not(.primary) kbd { background: #eef0f5; color: var(--muted); }
.status {
  margin-left: auto; font-size: 13px; color: var(--muted);
  padding: 4px 12px; border-radius: 999px; background: #eef0f5;
}
.status.busy { color: #b9770b; background: #fff3df; }
.status.done { color: #1f9d55; background: var(--out); }
.status.error { color: #d23a3a; background: #fdecec; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px; text-align: center;
  box-shadow: 0 2px 10px rgba(20, 30, 60, 0.04);
}
.stat-val { font-size: 26px; font-weight: 700; color: var(--primary-d); }
.stat-label { font-size: 12px; color: var(--muted); margin-top: 4px; }

.guide {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 22px; margin-top: 18px;
  box-shadow: 0 2px 10px rgba(20, 30, 60, 0.04);
}
.guide h2 { margin: 0 0 10px; font-size: 17px; }
.guide ol { margin: 0; padding-left: 20px; }
.guide li { margin: 6px 0; }
.guide code, .guide kbd {
  background: #eef0f5; border-radius: 5px; padding: 1px 7px; font-size: 12px;
}
.warn {
  margin: 14px 0 0; font-size: 13px; color: #b9770b;
  background: #fff3df; padding: 10px 14px; border-radius: 10px;
}

.site-footer {
  text-align: center; color: var(--muted); font-size: 12px;
  padding: 22px;
}

@media (max-width: 760px) {
  .editors { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  textarea { min-height: 260px; }
}