:root {
  --bg: #0f1115; --panel: #171a21; --panel-2: #1e222b; --border: #2a2f3a;
  --text: #e6e9ef; --muted: #9aa3b2; --accent: #4f8cff; --accent-2: #36d399;
  --warn: #f5a623; --danger: #ff5c5c; --chip: #232838;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.55; padding: 32px 16px 64px;
}
.wrap { max-width: 880px; margin: 0 auto; position: relative; }
h1 { font-size: 22px; margin: 0 0 4px; letter-spacing: .3px; }
.sub { color: var(--muted); font-size: 13px; margin-bottom: 24px; }
.sub b { color: var(--accent-2); font-weight: 600; }

/* 语言切换（对齐站点风格） */
.langswitch { position: absolute; top: 4px; right: 0; font-size: 13px; }
.langswitch a { position: relative; color: var(--accent); text-decoration: none; padding: 4px 10px; border: 1px solid var(--border); border-radius: 7px; }
.langswitch a:hover { border-color: var(--accent); }
.langswitch a::after {
  content: attr(data-tip);
  position: absolute; top: calc(100% + 8px); right: 0; white-space: nowrap;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  padding: 4px 9px; border-radius: 6px; font-size: 12px; line-height: 1.4;
  opacity: 0; transform: translateY(-4px); pointer-events: none;
  transition: opacity .15s ease, transform .15s ease; box-shadow: 0 6px 18px rgba(0,0,0,.18); z-index: 50;
}
.langswitch a:hover::after { opacity: 1; transform: translateY(0); }

.back {
  display: inline-flex; align-items: center; gap: 6px; margin-bottom: 16px;
  padding: 5px 13px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--chip); color: var(--muted);
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 12.5px; font-weight: 600; text-decoration: none;
  transition: color .15s, border-color .15s, transform .12s;
}
.back:hover { color: var(--accent); border-color: var(--accent); transform: translateX(-2px); }

.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 18px; margin-bottom: 18px; }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 680px) { .io { grid-template-columns: 1fr; } }
textarea {
  width: 100%; min-height: 230px; background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  font-size: 13.5px; line-height: 1.5; resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }
textarea[readonly] { color: var(--muted); }
.lab { display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; color: var(--muted); margin-bottom: 8px; }
.lab .cnt { color: var(--accent-2); font-variant-numeric: tabular-nums; font-weight: 600; }

.opts { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; margin: 6px 0 16px; }
.opt { display: flex; align-items: flex-start; gap: 9px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; cursor: pointer; font-size: 13.5px; user-select: none; }
.opt input { width: 16px; height: 16px; accent-color: var(--accent); flex: none; }
.opt:hover { border-color: var(--accent); }
.opt .d { color: var(--muted); font-size: 11.5px; display: block; margin-top: 3px; line-height: 1.4; }

.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
button { font: inherit; cursor: pointer; border-radius: 10px; border: 1px solid transparent; padding: 10px 18px; font-size: 14px; font-weight: 600; }
.btn-primary { background: linear-gradient(135deg, var(--accent), #6aa0ff); color: #fff; box-shadow: 0 6px 20px rgba(79,140,255,.3); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { background: var(--panel-2); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }
.status { font-size: 12.5px; color: var(--muted); margin-left: auto; }
.status b { color: var(--accent-2); }