/* ===== 后台管理样式 ===== */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", Arial, sans-serif;
  font-size: 14px;
  background: #f4f6f9;
  color: #1d232b;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* 顶栏 */
.admin-topbar {
  background: #14181d;
  color: #fff;
  height: 56px;
  display: flex;
  align-items: center;
  border-bottom: 3px solid #1a5fb4;
}
.admin-topbar > .container {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.admin-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}
.admin-brand-mark {
  width: 36px; height: 36px;
  background: #1a5fb4;
  color: #fff;
  border-radius: 8px;
  display: grid; place-items: center;
  font-weight: 800; font-size: 16px;
}
.admin-logo-img {
  width: 40px; height: 40px;
  border-radius: 8px;
  object-fit: contain;
  flex: none;
}
.admin-brand b { font-size: 15px; }
.admin-brand small { display: block; font-size: 11px; color: #9aa3ae; letter-spacing: 0.08em; }
.admin-topnav { display: flex; gap: 18px; font-size: 13.5px; }
.admin-topnav a { color: #c6ccd4; }
.admin-topnav a:hover { color: #fff; }

/* 侧栏 */
.admin-shell {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 56px);
}
.admin-side {
  background: #1d232b;
  color: #c6ccd4;
  padding: 18px 0;
}
.admin-side a {
  display: block;
  padding: 12px 22px;
  color: #c6ccd4;
  font-size: 14px;
  border-left: 3px solid transparent;
}
.admin-side a:hover { background: rgba(255,255,255,0.04); color: #fff; }
.admin-side a.active {
  background: #14181d;
  color: #fff;
  border-left-color: #1a5fb4;
}

.admin-main { padding: 28px 36px; }
.admin-page-title h1 {
  font-size: 22px;
  margin: 0 0 18px;
  font-weight: 700;
}
.admin-flash {
  display: inline-block;
  background: #e7f5ea;
  color: #1b6b2c;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  margin-left: 12px;
}

/* 通用 */
.admin-card {
  background: #fff;
  border: 1px solid #e3e7ec;
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 16px;
}
.admin-stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}
.admin-stat {
  background: #fff;
  border: 1px solid #e3e7ec;
  border-radius: 10px;
  padding: 18px 20px;
  text-align: center;
}
.admin-stat b {
  display: block;
  font-size: 28px;
  color: #1a5fb4;
  font-weight: 800;
}
.admin-stat span { font-size: 13px; color: #6b7684; }

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
.admin-table th, .admin-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid #eef0f3;
  font-size: 13.5px;
}
.admin-table th {
  background: #f7f9fb;
  color: #4a5563;
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.02em;
}
.admin-table tr:hover { background: #fafbfd; }

.admin-btn {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 13.5px;
  font-weight: 500;
  border: 1px solid transparent;
  background: #1a5fb4;
  color: #fff;
  text-decoration: none;
  cursor: pointer;
}
.admin-btn:hover { background: #123f78; color: #fff; }
.admin-btn.ghost { background: #fff; color: #1a5fb4; border-color: #cdd5df; }
.admin-btn.ghost:hover { background: #f0f5fc; }
.admin-btn.danger { background: #b03a3a; }
.admin-btn.danger:hover { background: #8b2c2c; }
.admin-btn.sm { padding: 5px 12px; font-size: 12.5px; }

.admin-form-row { margin-bottom: 14px; }
.admin-form-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #4a5563;
  margin-bottom: 5px;
}
.admin-form-row input,
.admin-form-row textarea,
.admin-form-row select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #cdd5df;
  border-radius: 6px;
  font-size: 13.5px;
  font-family: inherit;
  background: #fff;
  color: #1d232b;
}
.admin-form-row textarea { min-height: 90px; resize: vertical; }
.admin-form-row input:focus,
.admin-form-row textarea:focus,
.admin-form-row select:focus {
  outline: none;
  border-color: #1a5fb4;
  box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.15);
}
.admin-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.admin-actions {
  display: flex;
  gap: 8px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid #eef0f3;
}

.admin-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.admin-list-grid a {
  background: #fff;
  border: 1px solid #e3e7ec;
  border-radius: 8px;
  padding: 14px 18px;
  color: #1d232b;
  text-decoration: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.2s;
}
.admin-list-grid a:hover { border-color: #1a5fb4; transform: translateY(-1px); }
.admin-list-grid a small { color: #6b7684; font-size: 12px; }

.admin-error {
  background: #fbeaea;
  color: #8b2c2c;
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 14px;
  font-size: 13px;
}

.admin-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  background: #eef2f8;
  color: #1a5fb4;
  font-size: 11.5px;
  font-weight: 500;
  border: 1px solid rgba(26,95,180,0.2);
}
.admin-tag.gray { background: #f0f1f3; color: #4a5563; border-color: #d6dbe0; }

/* 登录页 */
.admin-login-page {
  min-height: 100vh;
  background: linear-gradient(135deg, #14181d 0%, #0d2c54 100%);
  display: grid;
  place-items: center;
  padding: 24px;
}
.admin-login-card {
  background: #fff;
  padding: 38px 40px;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  max-width: 380px;
  width: 100%;
}
.admin-login-card h1 {
  margin: 0 0 6px;
  font-size: 22px;
  color: #14181d;
}
.admin-login-card p { margin: 0 0 24px; color: #6b7684; font-size: 13.5px; }
.admin-login-card .form-group { margin-bottom: 14px; }
.admin-login-card label { display: block; font-size: 12.5px; font-weight: 600; color: #4a5563; margin-bottom: 5px; }
.admin-login-card input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #cdd5df;
  border-radius: 6px;
  font-size: 14px;
  box-sizing: border-box;
}
.admin-login-card input:focus { outline: none; border-color: #1a5fb4; box-shadow: 0 0 0 3px rgba(26,95,180,0.15); }
.admin-login-card button {
  width: 100%;
  padding: 12px;
  background: #1a5fb4;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 6px;
}
.admin-login-card button:hover { background: #123f78; }
.admin-login-card .err { color: #b03a3a; font-size: 12.5px; margin-bottom: 12px; }

/* 移动端 */
@media (max-width: 720px) {
  .admin-shell { grid-template-columns: 1fr; }
  .admin-side {
    display: flex;
    flex-wrap: wrap;
    padding: 8px;
    gap: 4px;
  }
  .admin-side a { padding: 8px 12px; border-left: none; border-radius: 6px; }
  .admin-stats { grid-template-columns: repeat(2, 1fr); }
  .admin-grid-2 { grid-template-columns: 1fr; }
  .admin-main { padding: 18px; }
}