/* 守位 - 后台样式（响应式） */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Arial, sans-serif; background: #f4f7fb; color: #24324a; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* 登录页 */
.login-body { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(150deg,#eaf3ff,#f6fffb); padding: 20px; }
.login-card { width: 100%; max-width: 380px; background: #fff; border-radius: 16px; padding: 34px 30px; box-shadow: 0 14px 40px rgba(31,58,95,.12); }
.login-card h1 { font-size: 22px; margin-bottom: 20px; text-align: center; }
.login-card label { display: block; font-size: 13px; color: #5b6b85; margin-bottom: 14px; }
.login-card input { width: 100%; padding: 11px 12px; border: 1px solid #dbe4ef; border-radius: 8px; font-size: 15px; margin-top: 6px; }
.login-card input:focus { outline: none; border-color: #2f6fdb; }
.login-card .btn { width: 100%; margin-top: 8px; }
.login-tip { font-size: 12px; color: #7b8aa3; text-align: center; margin-top: 16px; }
.login-back { text-align: center; margin-top: 12px; font-size: 13px; color: #2f6fdb; }

/* 按钮 */
.btn { display: inline-block; padding: 10px 22px; border-radius: 8px; font-size: 14px; font-weight: 600; border: none; cursor: pointer; background: #2f6fdb; color: #fff; transition: opacity .2s; }
.btn:hover { opacity: .88; }
.btn-ghost { background: #eef3fb; color: #2f6fdb; }
.btn-danger { background: #d9534f; }
.btn-sm { padding: 5px 12px; font-size: 12px; border-radius: 6px; }
.btn-lg { padding: 12px 30px; font-size: 15px; }

/* 导航 */
.admin-nav { background: #10233f; color: #fff; position: sticky; top: 0; z-index: 20; }
.admin-nav-inner { max-width: 1080px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.admin-brand { font-weight: 700; font-size: 15px; }
.admin-tabs { display: flex; gap: 6px; flex: 1; flex-wrap: wrap; }
.admin-tabs a { padding: 7px 14px; border-radius: 8px; font-size: 14px; color: #aebbd0; }
.admin-tabs a.on { background: #2f6fdb; color: #fff; }
.admin-logout { font-size: 13px; color: #ffb4b0; }

/* 主体 */
.admin-main { max-width: 1080px; margin: 24px auto 60px; padding: 0 20px; }
fieldset { border: 1px solid #e2eaf4; background: #fff; border-radius: 12px; padding: 20px 22px; margin-bottom: 18px; }
legend { font-size: 15px; font-weight: 700; color: #1f3a5f; padding: 0 8px; }
label { display: block; font-size: 13px; color: #5b6b85; margin-bottom: 14px; }
label input, label textarea { width: 100%; padding: 10px 12px; border: 1px solid #dbe4ef; border-radius: 8px; font-size: 14px; margin-top: 6px; font-family: inherit; }
label input:focus, label textarea:focus { outline: none; border-color: #2f6fdb; }
.hint { font-size: 12px; color: #8a99b2; }

/* 消息 */
.msg-ok, .msg-err { border-radius: 8px; padding: 12px 16px; margin-bottom: 16px; font-size: 14px; }
.msg-ok { background: #e5f8ef; color: #0d7a4f; border: 1px solid #b8ecd4; }
.msg-err { background: #fdeceb; color: #b03024; border: 1px solid #f6c8c4; }

/* 表格 */
.admin-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 4px 16px rgba(31,58,95,.06); margin-top: 18px; }
.admin-table th, .admin-table td { padding: 12px 14px; text-align: left; font-size: 14px; border-bottom: 1px solid #eef2f8; vertical-align: middle; }
.admin-table th { background: #f7fafd; color: #5b6b85; font-weight: 600; }
.td-desc { max-width: 280px; color: #5b6b85; }
.thumb { width: 56px; height: 56px; object-fit: cover; border-radius: 8px; }

/* 移动端 */
@media (max-width: 640px) {
  .admin-nav-inner { gap: 10px; }
  .admin-tabs { width: 100%; }
  .admin-table { display: block; overflow-x: auto; white-space: nowrap; }
}