:root {
  --bg: #f7f5f2;
  --panel: #ffffff;
  --fg: #1d1c1a;
  --muted: #6f6a63;
  --line: #e2ddd5;
  --accent: #3e6e5c;
  --danger: #b3261e;
  --warn: #8a5a00;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(247, 245, 242, .92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1180px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 20px;
}
.brand { font-weight: 600; font-size: 17px; color: var(--fg); }
.topbar nav { display: flex; gap: 16px; flex: 1; }
.topbar nav a { color: var(--muted); }
.topbar nav a.active { color: var(--fg); font-weight: 600; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 24px 20px 60px; }

.page-head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.page-head h1 { font-size: 22px; margin: 0; flex: 1; }
.actions { display: flex; gap: 8px; align-items: center; }
h2.section { font-size: 15px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 28px 0 10px; }
h2.section .muted { text-transform: none; letter-spacing: 0; font-weight: 400; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px; margin-bottom: 18px;
}
.card.narrow { max-width: 420px; margin: 8vh auto; }
.card h1 { font-size: 20px; margin: 0 0 8px; }
.card h2 { font-size: 16px; margin: 0 0 10px; }
.card.sticky { position: sticky; top: 76px; }

label { display: block; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
label.checkbox { display: flex; align-items: center; gap: 8px; }
label.checkbox input { width: auto; }
input, select, textarea {
  width: 100%; margin-top: 5px; padding: 8px 10px;
  border: 1px solid var(--line); border-radius: 7px;
  background: #fff; color: var(--fg); font: inherit;
}
textarea { font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Consolas, monospace; font-size: 13px; line-height: 1.7; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 13px; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.right { text-align: right; }
.nowrap { white-space: nowrap; }

.btn {
  display: inline-block; padding: 8px 14px; border-radius: 7px;
  border: 1px solid var(--line); background: #fff; color: var(--fg);
  font: inherit; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-danger { color: var(--danger); border-color: #e6c9c6; }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--muted); }
.inline { display: inline; }

table.grid { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
table.grid th, table.grid td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
table.grid th { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); background: #fbfaf8; }
table.grid tr:last-child td { border-bottom: none; }

.tag {
  display: inline-block; padding: 1px 7px; border-radius: 999px;
  background: #ece9e3; color: var(--muted); font-size: 12px; margin-right: 4px;
}
.tag-ok { background: #e3efe8; color: #2c6b4f; }
.tag-warn { background: #f7ecda; color: var(--warn); }
.tag-bad { background: #f7e3e1; color: var(--danger); }

.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; border: 1px solid; }
.alert-ok { background: #e9f4ee; border-color: #c9e2d5; color: #24614a; }
.alert-error { background: #fbeceb; border-color: #f0cdc9; color: #97251d; }
.alert-warn { background: #fdf4e4; border-color: #ecd9b3; color: #7a5200; }

.editor { display: grid; grid-template-columns: 1fr 320px; gap: 20px; align-items: start; }
.editor-side { display: flex; flex-direction: column; }
.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.row label { flex: 1; min-width: 200px; }

.counter { float: right; font-size: 12px; }
.preview-pane { margin-top: 6px; }
.preview-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; font-size: 13px; color: var(--muted); }
.preview {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
  padding: 16px 18px; min-height: 120px; max-height: 60vh; overflow: auto;
}
.preview h1 { font-size: 22px; } .preview h2 { font-size: 18px; } .preview h3 { font-size: 16px; }
.preview code { background: #f1eee8; padding: 1px 5px; border-radius: 4px; font-size: 13px; }
.preview pre { background: #f1eee8; padding: 12px; border-radius: 8px; overflow: auto; }
.preview pre code { background: none; padding: 0; }
.preview table { border-collapse: collapse; }
.preview th, .preview td { border: 1px solid var(--line); padding: 6px 10px; }
.preview blockquote { margin: 0; padding-left: 12px; border-left: 3px solid var(--line); color: var(--muted); }

.foot {
  max-width: 1180px; margin: 0 auto; padding: 18px 20px 40px;
  display: flex; gap: 16px; justify-content: space-between;
  color: var(--muted); font-size: 12.5px; flex-wrap: wrap;
}

@media (max-width: 900px) {
  .editor { grid-template-columns: 1fr; }
  .card.sticky { position: static; }
  table.grid { display: block; overflow-x: auto; }
}