/* ========== 全局重置 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  background: linear-gradient(120deg, #0a0f1c, #05080f);
  color: #fff;
  min-height: 100vh;
  padding: 30px 20px;
  animation: fadeIn 1.2s ease-in;
}

/* 页面渐入 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(1.02);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ========== 容器 ========== */
.admin-container {
  max-width: 800px;
  margin: 0 auto;
}

/* ========== 返回链接 ========== */
.back-link {
  color: #888;
  text-decoration: none;
  display: inline-block;
  margin-bottom: 20px;
  transition: 0.3s;
  font-size: 14px;
}

.back-link:hover {
  color: #4da3ff;
}

/* ========== 主卡片 ========== */
.admin-card {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(77, 163, 255, 0.15);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

/* ========== 卡片头部 ========== */
.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid rgba(77, 163, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 18px;
}

.card-header .header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.card-header .auth-status {
  font-size: 13px;
  color: #666;
  font-weight: 400;
}

/* ========== 登出按钮 ========== */
.logout-btn {
  background: rgba(220, 53, 69, 0.2);
  border: 1px solid rgba(220, 53, 69, 0.3);
  color: #ff6b7a;
  padding: 6px 18px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.3s;
}

.logout-btn:hover {
  background: rgba(220, 53, 69, 0.4);
  border-color: #dc3545;
  color: #fff;
}

/* ========== 登录区域 ========== */
.login-box {
  padding: 50px 30px;
  max-width: 400px;
  margin: 0 auto;
}

.login-box .login-title {
  text-align: center;
  color: #888;
  margin-bottom: 30px;
  font-size: 15px;
}

.login-box .form-group {
  margin-bottom: 18px;
}

.login-box .form-group label {
  display: block;
  color: #aaa;
  font-size: 13px;
  margin-bottom: 6px;
}

.login-box .form-group input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  transition: 0.3s;
  outline: none;
}

.login-box .form-group input:focus {
  border-color: #4da3ff;
  box-shadow: 0 0 0 3px rgba(77, 163, 255, 0.15);
}

.login-box .form-group input::placeholder {
  color: #555;
}

.login-btn {
  width: 100%;
  padding: 12px;
  background: #4da3ff;
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
  margin-top: 6px;
}

.login-btn:hover {
  background: #3b8ae0;
  transform: translateY(-1px);
  box-shadow: 0 8px 25px rgba(77, 163, 255, 0.3);
}

.login-error {
  background: rgba(220, 53, 69, 0.15);
  border: 1px solid rgba(220, 53, 69, 0.2);
  color: #ff6b7a;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-top: 16px;
  display: none;
}

/* ========== 管理面板 ========== */
.dashboard-stats {
  padding: 12px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #888;
  font-size: 14px;
}

.refresh-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #888;
  padding: 4px 14px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.3s;
}

.refresh-btn:hover {
  border-color: #4da3ff;
  color: #4da3ff;
}

/* ========== 留言列表 ========== */
.message-list {
  padding: 0;
}

.message-item {
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  transition: 0.2s;
}

.message-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.message-item:last-child {
  border-bottom: none;
}

.message-username {
  color: #4da3ff;
  font-weight: 600;
}

.message-private-badge {
  background: rgba(255, 255, 255, 0.06);
  color: #666;
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 20px;
  margin-left: 8px;
}

.message-content {
  margin: 6px 0 4px;
  font-size: 15px;
  word-break: break-all;
  color: #000000;
}

.message-meta {
  color: #555;
  font-size: 12px;
}

/* ========== 空状态 ========== */
.empty-msg {
  text-align: center;
  color: #444;
  padding: 60px 20px;
  font-size: 16px;
}

.loading-msg {
  text-align: center;
  color: #444;
  padding: 40px;
  font-size: 14px;
}

/* ========== 移动端适配 ========== */
@media (max-width: 640px) {
  body {
    padding: 16px 12px;
  }

  .card-header {
    font-size: 16px;
    padding: 14px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .card-header .header-left {
    gap: 10px;
  }

  .logout-btn {
    font-size: 12px;
    padding: 4px 12px;
  }

  .login-box {
    padding: 30px 16px;
  }

  .message-item {
    padding: 14px 16px;
  }

  .message-content {
    font-size: 14px;
  }

  .dashboard-stats {
    font-size: 13px;
    padding: 10px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }
}