:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --line: #e3e6ea;
  --text: #24292f;
  --muted: #6a737d;
  --accent: #0f6cbd;
  --accent-soft: #e8f1fb;
  --ok: #1a7f37;
  --err: #cf222e;
  --err-soft: #ffebe9;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 20px; }
.title { font-weight: 600; font-size: 16px; }

.topbar-right { display: flex; align-items: center; gap: 12px; }

.status { font-size: 12px; padding: 3px 10px; border-radius: 12px; }
.status.loading { background: #fff8c5; color: #7d4e00; }
.status.ready { background: #dafbe1; color: var(--ok); }
.status.failed { background: var(--err-soft); color: var(--err); }

.lang-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 6px;
  padding: 4px 12px;
  cursor: pointer;
  font-size: 13px;
}
.lang-btn:hover { background: var(--accent-soft); }

.layout { display: flex; min-height: calc(100vh - 53px); }

.sidebar {
  width: 230px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 12px 10px;
  overflow-y: auto;
  max-height: calc(100vh - 53px);
}

.cat-title {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 14px 8px 4px;
}
.cat-title:first-child { margin-top: 2px; }

.tool-btn {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13.5px;
  color: var(--text);
}
.tool-btn:hover { background: var(--accent-soft); }
.tool-btn.active { background: var(--accent); color: #fff; }
.tool-btn.disabled { color: #bbb; cursor: not-allowed; }

.content { flex: 1; padding: 20px 26px; max-width: 980px; }

.placeholder { color: var(--muted); margin-top: 80px; text-align: center; }

.tool-page h2 { margin: 0 0 4px; font-size: 19px; }
.tool-page .tool-desc { color: var(--muted); font-size: 13px; margin-bottom: 16px; }

.zone {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}
.zone-title { font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 8px; }

.view-toggle { margin-bottom: 8px; display: flex; gap: 6px; align-items: center; }
.view-toggle button {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 2px 10px;
  border-radius: 5px;
  font-size: 12px;
  cursor: pointer;
}
.view-toggle button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

textarea.io {
  width: 100%;
  min-height: 90px;
  font-family: var(--mono);
  font-size: 13px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  resize: vertical;
}
textarea.io:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.params { display: flex; flex-wrap: wrap; gap: 12px; }
.param { display: flex; flex-direction: column; gap: 4px; min-width: 180px; flex: 1; }
.param label { font-size: 12.5px; color: var(--muted); }
.param input, .param select {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 9px;
  font-size: 13px;
  font-family: var(--mono);
}
.param input:focus, .param select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.output-box {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  min-height: 60px;
  white-space: pre-wrap;
  word-break: break-all;
}

.output-box.error { background: var(--err-soft); border-color: var(--err); color: var(--err); }

.actions { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.btn {
  border: none;
  border-radius: 6px;
  padding: 8px 18px;
  font-size: 13.5px;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #0c5ba0; }
.btn-secondary { background: var(--accent-soft); color: var(--accent); }
.btn-secondary:hover { background: #d5e6f7; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.detect-list { list-style: none; padding: 0; margin: 0; }
.detect-list li { padding: 4px 0; border-bottom: 1px dashed var(--line); font-family: var(--mono); font-size: 13px; }
.detect-list li:last-child { border-bottom: none; }

footer { color: var(--muted); font-size: 12px; padding: 10px 26px; }

@media (max-width: 720px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; max-height: none; border-right: none; border-bottom: 1px solid var(--line); }
  .content { padding: 14px; }
}