* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; background: #f5f7fa; color: #222; line-height: 1.6; }
a { color: #1e6ce3; text-decoration: none; transition: 0.2s; }
a:hover { opacity: 0.8; }
.nav { background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.06); position: sticky; top: 0; z-index: 99; }
.nav .container { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; }
.brand { font-weight: 700; font-size: 20px; color: #111; display: flex; align-items: center; gap: 8px; }
.menu { display: flex; align-items: center; gap: 20px; font-size: 14px; }
.menu a { color: #555; }
.menu a:hover { color: #1e6ce3; }
.btn { display: inline-block; padding: 9px 20px; border-radius: 8px; background: #1e6ce3; color: #fff !important; border: none; cursor: pointer; font-size: 14px; font-weight: 500; text-align: center; transition: 0.2s; }
.btn:hover { background: #1557c0; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-block { width: 100%; display: block; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.card { background: #fff; border-radius: 12px; box-shadow: 0 2px 12px rgba(0,0,0,.04); padding: 24px; margin: 20px 0; border: 1px solid #f0f0f0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
label { font-size: 14px; color: #444; font-weight: 500; display: block; margin-bottom: 6px; margin-top: 12px; }
input, select { width: 100%; padding: 10px 14px; border: 1px solid #dfe3ea; border-radius: 8px; font-size: 14px; outline: none; transition: 0.2s; background: #fafbfc; }
input:focus, select:focus { border-color: #1e6ce3; background: #fff; box-shadow: 0 0 0 3px rgba(30,108,227,.1); }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 10px; }
th, td { padding: 12px 14px; border-bottom: 1px solid #eef1f5; text-align: left; }
th { background: #fafbfd; color: #666; font-weight: 600; white-space: nowrap; }
tr:hover td { background: #fcfcfc; }
.footer { text-align: center; color: #98a1b0; font-size: 13px; padding: 40px 0 20px; }
.alert { padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; }
.alert-error { background: #fef0f0; color: #f56c6c; border: 1px solid #fde2e2; }
.alert-success { background: #f0f9eb; color: #67c23a; border: 1px solid #e1f3d8; }