:root {
  --bg: #f4f6f8; --panel: #ffffff; --line: #dde3e9;
  --ink: #25303a; --muted: #73808c; --accent: #2f6fae;
  --danger: #b23b3b;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
       font-family: "Microsoft YaHei UI", "Segoe UI", sans-serif; }
header { background: #26323c; color: #fff; padding: 12px 20px;
         display: flex; justify-content: space-between; align-items: center; }
header h1 { font-size: 17px; margin: 0; }
main, section#loginView { max-width: 1100px; margin: 20px auto; padding: 0 16px; }
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 13px; }
.error { color: var(--danger); }
.card { background: var(--panel); border: 1px solid var(--line);
        border-radius: 8px; padding: 18px; }
form label { display: block; margin: 10px 0; }
form input, form select {
  width: 100%; padding: 8px 10px; margin-top: 4px;
  border: 1px solid var(--line); border-radius: 6px; }
form.card.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
form.card.row label { flex: 1; min-width: 160px; margin: 0; }
button { background: var(--accent); color: #fff; border: 0; border-radius: 6px;
         padding: 8px 16px; cursor: pointer; }
button:hover { filter: brightness(1.06); }
nav { display: flex; gap: 8px; margin-bottom: 12px; }
nav button { background: #dfe5ea; color: var(--ink); }
nav button.active { background: var(--accent); color: #fff; }
.toolbar { display: flex; justify-content: space-between; align-items: baseline; }
h2 { font-size: 15px; }
table { width: 100%; border-collapse: collapse; background: var(--panel);
        border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
th, td { padding: 7px 9px; border-bottom: 1px solid var(--line);
         text-align: left; font-size: 13px; vertical-align: top; }
th { background: #e9eef2; font-weight: 600; }
a { color: var(--accent); }
.toast { position: fixed; right: 20px; bottom: 20px; max-width: 420px;
         background: #26323c; color: #fff; padding: 10px 14px;
         border-radius: 8px; opacity: 0; pointer-events: none;
         transition: opacity .2s; font-size: 13px; z-index: 10; }
.toast.visible { opacity: 1; }
#loginView .card { max-width: 360px; margin: 60px auto; }
#loginView button, #userForm button { width: 100%; }