/* =============================================================
   班主任工作台 —— 全局样式
   设计取向：标准后台管理系统（浅灰底 / 白卡片 / 蓝强调色）
   ============================================================= */

:root {
  --c-bg: #f0f2f5;
  --c-card: #ffffff;
  --c-border: #e5e7eb;
  --c-border-strong: #d1d5db;
  --c-text: #1f2937;
  --c-text-2: #4b5563;
  --c-muted: #6b7280;
  --c-muted-2: #9ca3af;
  --c-primary: #2563eb;
  --c-primary-hover: #1d4ed8;
  --c-primary-bg: #eff6ff;
  --c-danger: #dc2626;
  --c-danger-bg: #fef2f2;
  --c-success: #16a34a;
  --c-success-bg: #f0fdf4;
  --c-warning: #d97706;
  --c-warning-bg: #fffbeb;
  --c-sidebar-w: 220px;
  --c-radius: 8px;
  --c-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.55;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ 登录页 ============ */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--c-bg);
}
.login-card {
  width: 380px;
  max-width: 92vw;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  padding: 36px 32px;
}
.login-title { font-size: 20px; font-weight: 600; margin-bottom: 4px; }
.login-sub { font-size: 13px; color: var(--c-muted); margin-bottom: 24px; }
.login-card .form-item { margin-bottom: 16px; }
.login-error {
  background: var(--c-danger-bg);
  color: var(--c-danger);
  border: 1px solid #fecaca;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

/* ============ 布局 ============ */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--c-sidebar-w);
  min-width: var(--c-sidebar-w);
  background: var(--c-card);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar-brand {
  padding: 18px 20px;
  border-bottom: 1px solid var(--c-border);
}
.sidebar-brand .name { font-size: 16px; font-weight: 600; }
.sidebar-brand .desc { font-size: 12px; color: var(--c-muted); margin-top: 2px; }

.nav { flex: 1; overflow-y: auto; padding: 10px 8px; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  margin-bottom: 2px;
  border-radius: 6px;
  color: var(--c-text-2);
  cursor: pointer;
  font-size: 14px;
  border-left: 3px solid transparent;
  user-select: none;
}
.nav-item:hover { background: #f3f4f6; }
.nav-item.active {
  background: var(--c-primary-bg);
  color: var(--c-primary);
  border-left-color: var(--c-primary);
  font-weight: 500;
}
.nav-item svg { flex-shrink: 0; }
.nav-item .badge-dot {
  margin-left: auto;
  background: var(--c-danger);
  color: #fff;
  font-size: 11px;
  min-width: 18px;
  height: 18px;
  line-height: 18px;
  border-radius: 9px;
  text-align: center;
  padding: 0 5px;
}

.sidebar-user {
  border-top: 1px solid var(--c-border);
  padding: 12px 16px;
  font-size: 13px;
}
.sidebar-user .u-name { font-weight: 500; }
.sidebar-user .u-role { color: var(--c-muted); font-size: 12px; margin-top: 1px; }
.sidebar-user .u-actions { margin-top: 8px; display: flex; gap: 12px; }
.sidebar-user .u-actions a { font-size: 12px; color: var(--c-muted); }
.sidebar-user .u-actions a:hover { color: var(--c-primary); }

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

.topbar {
  height: 56px;
  background: var(--c-card);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .page-title { font-size: 16px; font-weight: 600; }
.topbar .page-sub { font-size: 12px; color: var(--c-muted); margin-left: 12px; }

.content { padding: 24px; }

/* ============ 卡片 ============ */
.card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--c-radius);
  box-shadow: var(--c-shadow);
  padding: 20px;
  margin-bottom: 16px;
}
.card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title svg { color: var(--c-primary); }

/* ============ 统计块 ============ */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.stat {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--c-radius);
  padding: 16px 18px;
}
.stat .num { font-size: 26px; font-weight: 600; line-height: 1.2; }
.stat .label { font-size: 13px; color: var(--c-muted); margin-top: 4px; }
.stat.blue .num { color: var(--c-primary); }
.stat.green .num { color: var(--c-success); }
.stat.red .num { color: var(--c-danger); }
.stat.amber .num { color: var(--c-warning); }

/* ============ 表单 ============ */
.form-item { margin-bottom: 14px; }
.form-item label {
  display: block;
  font-size: 13px;
  color: var(--c-text-2);
  margin-bottom: 5px;
}
.form-item label .req { color: var(--c-danger); margin-left: 2px; }
.form-item input[type="text"],
.form-item input[type="password"],
.form-item input[type="date"],
.form-item input[type="datetime-local"],
.form-item input[type="number"],
.form-item select,
.form-item textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--c-border-strong);
  border-radius: 6px;
  font-size: 14px;
  color: var(--c-text);
  background: #fff;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-item input:focus,
.form-item select:focus,
.form-item textarea:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.form-item input[readonly] { background: #f9fafb; color: var(--c-muted); }
.form-item textarea { resize: vertical; min-height: 64px; }
.form-item .hint { font-size: 12px; color: var(--c-muted-2); margin-top: 4px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 14px;
  cursor: pointer;
  font-weight: 500;
  line-height: 1.4;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--c-primary-hover); }
.btn-default { background: #fff; border-color: var(--c-border-strong); color: var(--c-text-2); }
.btn-default:hover:not(:disabled) { border-color: var(--c-primary); color: var(--c-primary); }
.btn-danger { background: var(--c-danger-bg); color: var(--c-danger); border-color: #fecaca; }
.btn-danger:hover:not(:disabled) { background: #fee2e2; }
.btn-success { background: var(--c-success-bg); color: var(--c-success); border-color: #bbf7d0; }
.btn-success:hover:not(:disabled) { background: #dcfce7; }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }

/* ============ 表格 ============ */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-border); border-radius: var(--c-radius); }
table.table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.table th {
  background: #f9fafb;
  text-align: left;
  padding: 10px 12px;
  font-weight: 500;
  color: var(--c-muted);
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
}
table.table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--c-border);
  vertical-align: middle;
}
table.table tr:last-child td { border-bottom: none; }
table.table tbody tr:hover { background: #f9fafb; }
.table-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============ 标签 ============ */
.tag {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 4px;
  font-size: 12px;
  line-height: 1.6;
  white-space: nowrap;
}
.tag-gray { background: #f3f4f6; color: #4b5563; }
.tag-blue { background: var(--c-primary-bg); color: var(--c-primary); }
.tag-green { background: var(--c-success-bg); color: var(--c-success); }
.tag-red { background: var(--c-danger-bg); color: var(--c-danger); }
.tag-amber { background: var(--c-warning-bg); color: var(--c-warning); }
.tag-indigo { background: #eef2ff; color: #4f46e5; }
.tag-orange { background: #fff7ed; color: #ea580c; }

/* ============ 空状态 / 提示 ============ */
.empty {
  text-align: center;
  padding: 36px 16px;
  color: var(--c-muted-2);
  font-size: 13px;
}
.alert {
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  margin-bottom: 14px;
  border: 1px solid transparent;
}
.alert-info { background: var(--c-primary-bg); color: #1e40af; border-color: #bfdbfe; }
.alert-warn { background: var(--c-warning-bg); color: #92400e; border-color: #fde68a; }

/* ============ 弹窗 ============ */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.45);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-mask.show { display: flex; }
.modal {
  background: #fff;
  border-radius: 10px;
  width: 520px;
  max-width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.16);
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--c-border);
  font-size: 15px;
  font-weight: 600;
}
.modal-close {
  background: none;
  border: none;
  font-size: 22px;
  color: var(--c-muted);
  cursor: pointer;
  line-height: 1;
}
.modal-body { padding: 20px; }
.modal-foot {
  padding: 14px 20px;
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ============ 座位表 ============ */
.seating-grid {
  display: grid;
  grid-template-columns: 44px repeat(7, 1fr);
  gap: 6px;
  max-width: 720px;
}
.seat-corner { background: transparent; }
.seat-head {
  text-align: center;
  font-size: 12px;
  color: var(--c-muted);
  padding: 4px 0;
  font-weight: 500;
}
.seat-row-head {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--c-muted);
}
.seat-cell {
  min-height: 48px;
  border: 1px dashed var(--c-border-strong);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  background: #fff;
  transition: border-color 0.15s, background 0.15s;
  overflow: hidden;
}
.seat-cell.filled { border-style: solid; border-color: var(--c-border); background: #f9fafb; }
.seat-cell input {
  width: 100%;
  height: 100%;
  min-height: 46px;
  border: none;
  text-align: center;
  background: transparent;
  outline: none;
  font-size: 13px;
  padding: 2px;
}

/* ============ 选择卡片（订餐） ============ */
.choice-row { display: flex; gap: 10px; flex-wrap: wrap; }
.choice {
  flex: 1;
  min-width: 100px;
  border: 1px solid var(--c-border-strong);
  border-radius: 6px;
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  background: #fff;
  transition: all 0.15s;
}
.choice:hover { border-color: var(--c-primary); }
.choice.selected { border-color: var(--c-primary); background: var(--c-primary-bg); color: var(--c-primary); font-weight: 500; }
.choice .c-main { font-size: 14px; font-weight: 500; }
.choice .c-sub { font-size: 12px; color: var(--c-muted); margin-top: 2px; }

/* ============ 图片上传 ============ */
.upload-area {
  border: 1px dashed var(--c-border-strong);
  border-radius: 6px;
  padding: 14px;
  text-align: center;
  cursor: pointer;
  color: var(--c-muted);
  font-size: 13px;
  transition: border-color 0.15s;
}
.upload-area:hover { border-color: var(--c-primary); }
.img-preview {
  max-width: 180px;
  max-height: 180px;
  border-radius: 6px;
  margin-top: 8px;
  border: 1px solid var(--c-border);
  display: block;
}
.thumb { width: 44px; height: 44px; object-fit: cover; border-radius: 4px; border: 1px solid var(--c-border); cursor: pointer; }

/* ============ Toast ============ */
#toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}
.toast-item {
  background: #111827;
  color: #fff;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 13.5px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
  animation: toast-in 0.2s ease;
}
.toast-item.success { background: #16a34a; }
.toast-item.error { background: #dc2626; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ 响应式 ============ */
@media (max-width: 768px) {
  .layout { flex-direction: column; }
  .sidebar {
    width: 100%;
    min-width: 100%;
    height: auto;
    position: static;
  }
  .nav { display: flex; overflow-x: auto; }
  .nav-item { white-space: nowrap; border-left: none; border-bottom: 2px solid transparent; }
  .nav-item.active { border-bottom-color: var(--c-primary); }
  .sidebar-user { display: none; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .content { padding: 12px; }
}