:root{
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.layout{ height: 100%; display: flex; }

/* sidebar */
.sidebar{
  width: 240px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.brand{
  padding: 16px 14px;
  border-bottom: 1px solid var(--border);
}
.brand-title{ font-size: 16px; font-weight: 700; }
.brand-sub{ margin-top: 4px; font-size: 12px; color: var(--muted); }

.nav{
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.nav-item{
  text-decoration: none;
  color: var(--text);
  padding: 10px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  display: block;
}
.nav-item:hover{ background: #f3f4f6; }
.nav-item.active{
  background: rgba(37, 99, 235, 0.10);
  border-color: rgba(37, 99, 235, 0.25);
  color: var(--accent);
  font-weight: 700;
}

.sidebar-footer{
  margin-top: auto;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
}

.content{
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar{
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.page-title{ font-size: 16px; font-weight: 700; }
.muted{ color: var(--muted); font-size: 13px; }

.content-body{
  padding: 12px;
  flex: 1;
  overflow: auto;
}

/* components */
.card{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.toolbar{
  display:flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin: 12px 0;
}

input, button{
  padding: 8px;
  font-size: 14px;
}

button{
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
}

button:hover{ background: #f9fafb; }

button.primary{
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.divider{
  width: 1px;
  height: 24px;
  background: var(--border);
  display: inline-block;
  margin: 0 4px;
}

.badge{
  display:inline-block;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: #374151;
}

.panel{
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

.row{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.hint{
  margin: 10px 0 12px;
  padding: 10px;
  border: 1px dashed var(--border);
  border-radius: 10px;
  background: #fff;
  color: #374151;
}

.table-wrap{
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
}

table{
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}
th, td{
  border-bottom: 1px solid var(--border);
  padding: 10px;
  text-align: left;
}
th{ background: #f9fafb; }

/* ---- Modal (新增作业列) ---- */
.modal-mask{
  position: fixed;
  inset: 0;
  background: rgba(17,24,39,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal{
  width: 520px;
  max-width: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.modal-header{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.modal-title{
  font-weight: 700;
}

.modal-close{
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
}

.modal-body{
  padding: 14px;
}

.form-row{
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.form-row label{
  color: var(--muted);
  font-size: 13px;
}

.modal-footer{
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}
/* 登记页单元格输入框 */
.cell-input{
  width: 100%;
  min-width: 80px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  background: #fff;
}

.cell-input:focus{
  border-color: rgba(37, 99, 235, 0.55);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.10);
}

/* 删除列弹窗列表 */
.del-list{
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: #fff;
  max-height: 320px;
  overflow: auto;
}

.del-item{
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 6px;
  border-radius: 10px;
  cursor: pointer;
}

.del-item:hover{
  background: #f9fafb;
}

.del-item input{
  transform: scale(1.05);
}
/* 把 <a> 做成按钮样式（用于导出） */
.btn-link{
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
}
.btn-link:hover{
  background: #f9fafb;
}
button.danger{
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

button.danger:hover{
  background: #fef2f2;
}