:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --line: #e3e8ef;
  --text: #1f2933;
  --dim: #6b7684;
  --brand: #0a5cbf;
  --brand-soft: #eaf2fd;
  --ok: #167c3c;
  --err: #b42318;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.7 "Microsoft YaHei", "微软雅黑", -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 18px; }

/* 顶栏 */
.nav {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { font-size: 17px; font-weight: 700; color: var(--text); }
.brand .logo {
  display: inline-block; width: 28px; height: 28px; line-height: 28px;
  text-align: center; border-radius: 7px; margin-right: 8px;
  background: var(--brand); color: #fff; font-size: 13px; font-weight: 700;
}
.nav nav a { margin-left: 20px; color: var(--text); font-size: 14px; }
.nav nav a:hover { color: var(--brand); text-decoration: none; }

main { padding: 26px 0 40px; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 18px;
}
.card h2 { margin: 0 0 12px; font-size: 17px; }
.card h3 { margin: 16px 0 8px; font-size: 15px; }
.dim { color: var(--dim); }
.small { font-size: 13px; }
.mono { font-family: Consolas, Menlo, monospace; font-size: 12.5px; word-break: break-all; }

/* 首页 hero */
.hero { display: flex; gap: 18px; flex-wrap: wrap; align-items: stretch; }
.hero .left { flex: 1 1 460px; }
.hero .right { flex: 1 1 300px; }
.hero h1 { font-size: 26px; margin: 0 0 10px; }
.tag {
  display: inline-block; background: var(--brand-soft); color: var(--brand);
  border-radius: 999px; padding: 3px 10px; font-size: 12.5px; margin: 0 6px 8px 0;
}
.version {
  font-size: 30px; font-weight: 700; color: var(--brand);
  font-family: Consolas, Menlo, monospace;
}

/* 按钮 */
.btn {
  display: inline-block; background: var(--brand); color: #fff; border: 0;
  border-radius: 8px; padding: 10px 18px; font-size: 14.5px; cursor: pointer;
}
.btn:hover { background: #084a9c; text-decoration: none; }
.btn.ghost { background: #fff; color: var(--brand); border: 1px solid var(--brand); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.danger { background: var(--err); }

/* 表格 */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 13px; color: var(--dim); font-weight: 600; background: #fafcfe; }
tr:hover td { background: #fbfdff; }

/* 表单 */
label { display: block; font-size: 13.5px; color: var(--dim); margin: 12px 0 4px; }
input[type=text], input[type=email], textarea, select {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line);
  border-radius: 8px; font: inherit; background: #fff;
}
textarea { min-height: 130px; resize: vertical; }
.hp { position: absolute; left: -9999px; }
.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > * { flex: 1 1 220px; }

/* 提示 */
.flash { margin-bottom: 14px; }
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 8px; font-size: 14px; }
.msg.ok { background: #e8f6ee; color: var(--ok); }
.msg.err { background: #fdeceb; color: var(--err); }

/* 列表 */
ul.plain { list-style: none; padding: 0; margin: 0; }
ul.plain li { padding: 10px 0; border-bottom: 1px solid var(--line); }
ul.plain li:last-child { border-bottom: 0; }
.post-body { white-space: normal; line-height: 1.85; }
.reply { background: #fafcff; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.meta { font-size: 12.5px; color: var(--dim); margin-bottom: 6px; }
.st { display: inline-block; border-radius: 999px; padding: 2px 9px; font-size: 12px; }
.st.new { background: #fff4e5; color: #b25b00; }
.st.done { background: #e8f6ee; color: var(--ok); }

/* 页脚 */
.foot { border-top: 1px solid var(--line); background: #fff; padding: 16px 0; font-size: 13px; color: var(--dim); }
.foot .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

@media (max-width: 620px) {
  .nav .wrap { height: auto; flex-direction: column; align-items: flex-start; padding: 10px 18px; }
  .nav nav a { margin: 0 16px 0 0; }
}