* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #f5f6f8;
  color: #222;
}
.hidden { display: none !important; }

/* 登录层 */
#login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-card {
  background: #fff;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
  text-align: center;
  width: 360px;
}
.login-card h1 { font-size: 22px; margin-bottom: 12px; }
.login-card p { color: #666; margin-bottom: 20px; }
.login-card input {
  display: block;
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
}
.login-card input:focus { outline: none; border-color: #2563eb; }
#login-btn {
  width: 100%;
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 15px;
}
#login-btn:hover { background: #1d4ed8; }
.error { color: #d33; margin-top: 12px; font-size: 13px; }

/* 主界面 */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
}
header h1 { font-size: 18px; }
.user-info { display: flex; align-items: center; gap: 10px; }
#logout {
  background: none;
  border: 1px solid #ccc;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
}

nav {
  display: flex;
  gap: 4px;
  padding: 0 24px;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
}
nav button {
  background: none;
  border: none;
  padding: 12px 18px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  font-size: 14px;
}
nav button.active {
  border-bottom-color: #2563eb;
  color: #2563eb;
  font-weight: 600;
}

main { padding: 24px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.toolbar { margin-bottom: 14px; display: flex; gap: 8px; }
.toolbar button {
  padding: 8px 14px;
  border: 1px solid #d1d5db;
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
}
.toolbar button:hover { background: #f3f4f6; }

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
}
th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid #eef0f2;
  font-size: 14px;
}
th { background: #fafbfc; font-weight: 600; }
tr.danger td { background: #fff1f0; }
td button {
  padding: 4px 10px;
  border: 1px solid #d1d5db;
  background: #fff;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}
td button:hover { background: #f3f4f6; }

/* 弹窗 */
.modal-mask {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-box {
  background: #fff;
  padding: 24px 28px;
  border-radius: 10px;
  width: 360px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}
.modal-box h3 { margin: 0 0 18px; font-size: 17px; }
.modal-box label {
  display: block;
  margin-bottom: 14px;
  font-size: 13px;
  color: #555;
}
.modal-box input,
.modal-box select {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 9px 11px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
}
.modal-box input:focus,
.modal-box select:focus { outline: none; border-color: #2563eb; }
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}
.btn-cancel {
  background: #fff;
  border: 1px solid #d1d5db;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}
.btn-save {
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}
.btn-save:hover { background: #1d4ed8; }