/* =========================================================
   后台管理系统样式
   ========================================================= */
:root {
  --primary: #1a5cff;
  --primary-dark: #0d3fb8;
  --dark: #1c2333;
  --sidebar-w: 230px;
  --border: #e5e8f0;
  --bg: #f4f6fb;
  --danger: #e5484d;
  --success: #30a46c;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: #333;
  font-size: 14px;
}
a { text-decoration: none; color: var(--primary); }
ul { list-style: none; }
img { max-width: 100%; }

/* ---------- 登录页 ---------- */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0d3fb8, #1a5cff);
}
.login-box {
  width: 400px;
  background: #fff;
  border-radius: 12px;
  padding: 44px 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}
.login-box .brand { text-align: center; margin-bottom: 30px; }
.login-box .brand .en { font-size: 30px; font-weight: 800; color: var(--primary); }
.login-box .brand p { color: #999; font-size: 13px; margin-top: 4px; }
.login-box .field { margin-bottom: 18px; }
.login-box label { display: block; font-size: 13px; color: #666; margin-bottom: 6px; }
.login-box input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
}
.login-box input:focus { border-color: var(--primary); }
.login-box .btn {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  cursor: pointer;
  font-weight: 600;
}
.login-box .btn:hover { background: var(--primary-dark); }
.login-box .error {
  background: #fdeaea;
  color: var(--danger);
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 13px;
}
.login-box .tip { text-align: center; margin-top: 16px; font-size: 12px; color: #aaa; }

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

.sidebar {
  width: var(--sidebar-w);
  background: var(--dark);
  color: #c6cde0;
  flex-shrink: 0;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  overflow-y: auto;
  z-index: 50;
}
.sidebar .brand {
  padding: 22px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.sidebar .brand .en { font-size: 22px; font-weight: 800; color: #fff; }
.sidebar .brand span { font-size: 12px; color: #8a94b0; }
.sidebar .menu-title { padding: 18px 24px 6px; font-size: 12px; color: #6b7593; }
.sidebar a.item {
  display: block;
  padding: 12px 24px;
  color: #c6cde0;
  border-left: 3px solid transparent;
}
.sidebar a.item:hover { background: rgba(255, 255, 255, 0.06); color: #fff; }
.sidebar a.item.active { background: rgba(26, 92, 255, 0.18); color: #fff; border-left-color: var(--primary); }

.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: 26px 32px 60px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 26px;
}
.topbar h2 { font-size: 22px; color: var(--dark); }
.topbar .user { display: flex; align-items: center; gap: 16px; font-size: 13px; color: #666; }
.topbar .user a { padding: 6px 14px; border: 1px solid var(--border); border-radius: 6px; background: #fff; }

/* ---------- 卡片 ---------- */
.card {
  background: #fff;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 22px 24px;
  margin-bottom: 22px;
}
.card h3 { font-size: 16px; color: var(--dark); margin-bottom: 16px; }
.card .hint { color: #999; font-size: 12px; }

/* ---------- 仪表盘 ---------- */
.stat-cards { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; margin-bottom: 22px; }
.stat-card {
  background: #fff;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 22px;
}
.stat-card .num { font-size: 34px; font-weight: 800; color: var(--primary); }
.stat-card .label { color: #888; font-size: 13px; margin-top: 4px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table.table { width: 100%; border-collapse: collapse; }
.table th {
  text-align: left;
  padding: 12px 14px;
  background: #f8f9fc;
  color: #666;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.table td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tr:hover td { background: #fafbff; }
.table .thumb { width: 72px; height: 48px; object-fit: cover; border-radius: 6px; background: #f0f2f7; }
.table .thumb-square { width: 48px; height: 48px; object-fit: cover; border-radius: 6px; background: #f0f2f7; }
.table .actions { white-space: nowrap; }
.table .actions a, .table .actions button {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: #555;
  cursor: pointer;
  margin-right: 6px;
}
.table .actions a:hover, .table .actions button:hover { border-color: var(--primary); color: var(--primary); }
.table .actions form { display: inline; }
.table .actions .del { color: var(--danger); }
.table .actions .del:hover { border-color: var(--danger); color: var(--danger); }

.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; }
.badge.on { background: #e8f7ee; color: var(--success); }
.badge.off { background: #f2f3f5; color: #999; }
.badge.type-company { background: #e8efff; color: var(--primary); }
.badge.type-expo { background: #fdf0e3; color: #d98324; }
.badge.unread { background: #fdeaea; color: var(--danger); }

/* ---------- 表单 ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid .full { grid-column: 1 / -1; }
.form-grid .field label { display: block; font-size: 13px; color: #555; margin-bottom: 6px; font-weight: 600; }
.form-grid .field input,
.form-grid .field select,
.form-grid .field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  background: #fff;
}
.form-grid .field input:focus,
.form-grid .field select:focus,
.form-grid .field textarea:focus { border-color: var(--primary); }
.form-grid .field textarea { resize: vertical; min-height: 90px; }
.form-grid .field .tip { font-size: 12px; color: #aaa; margin-top: 4px; }

.form-actions { margin-top: 24px; display: flex; gap: 12px; }
.btn {
  display: inline-block;
  padding: 10px 26px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
}
.btn:hover { background: var(--primary-dark); color: #fff; }
.btn-secondary { background: #fff; color: #555; border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c93a3f; }
.btn-sm { padding: 6px 16px; font-size: 13px; }

.img-preview { margin-top: 8px; max-width: 200px; border-radius: 6px; border: 1px solid var(--border); }
.upload-tip { font-size: 12px; color: #aaa; margin-top: 4px; }

/* ---------- 消息提示 ---------- */
.alert {
  padding: 12px 18px;
  border-radius: 8px;
  margin-bottom: 18px;
  font-size: 14px;
}
.alert.success { background: #e8f7ee; color: #1a7f45; }
.alert.error { background: #fdeaea; color: #c93a3f; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .stat-cards { grid-template-columns: repeat(2, 1fr); }
  .sidebar { width: 200px; }
  .main { margin-left: 200px; padding: 20px; }
}