/* ============ 全局重置与基础 ============ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============ 导航栏 ============ */
.navbar {
  background: linear-gradient(135deg, #26a69a, #4db6ac);
  padding: 1rem 0;
  box-shadow: 0 2px 8px rgba(38, 166, 154, 0.25);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar .logo .icon {
  font-size: 1.8rem;
}

.navbar .nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.navbar .nav-links a {
  color: #fff;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  transition: background 0.2s;
}

.navbar .nav-links a:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ============ 容器 ============ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ============ Banner ============ */
.banner {
  background: linear-gradient(135deg, #e0f2f1, #b2dfdb);
  padding: 3rem 0;
  text-align: center;
}

.banner h1 {
  font-size: 2.2rem;
  color: #00897b;
  margin-bottom: 0.8rem;
}

.banner p {
  font-size: 1.1rem;
  color: #555;
  max-width: 600px;
  margin: 0 auto;
}

/* ============ 产品卡片网格 ============ */
.products-section {
  padding: 2.5rem 0;
  flex: 1;
}

.products-section .section-title {
  text-align: center;
  font-size: 1.6rem;
  color: #333;
  margin-bottom: 2rem;
  position: relative;
}

.products-section .section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: #26a69a;
  margin: 0.6rem auto 0;
  border-radius: 2px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* ============ 产品卡片 ============ */
.product-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid #dcefec;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 30px rgba(38, 166, 154, 0.2);
}

.product-card .card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: #e0f2f1;
}

.product-card .card-body {
  padding: 1.2rem;
}

.product-card .card-body h3 {
  font-size: 1.1rem;
  color: #333;
  margin-bottom: 0.5rem;
}

.product-card .card-body p {
  font-size: 0.9rem;
  color: #777;
  line-height: 1.5;
}

.product-card .card-body .price {
  display: inline-block;
  margin-top: 0.8rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: #26a69a;
}

/* ============ 产品详情页 ============ */
.product-detail {
  padding: 2.5rem 0;
  flex: 1;
}

.product-detail .back-link {
  display: inline-block;
  color: #26a69a;
  font-weight: 500;
  margin-bottom: 2rem;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.product-detail .back-link:hover {
  color: #00897b;
}

.product-detail .detail-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.detail-wrapper .detail-image {
  width: 100%;
  border-radius: 12px;
  background: #e0f2f1;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.detail-wrapper .detail-info h2 {
  font-size: 1.8rem;
  color: #333;
  margin-bottom: 0.5rem;
}

.detail-wrapper .detail-info .detail-price {
  font-size: 1.5rem;
  color: #26a69a;
  font-weight: 700;
  margin-bottom: 1.2rem;
}

.detail-wrapper .detail-info .detail-desc {
  font-size: 1rem;
  color: #555;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.detail-wrapper .detail-info .detail-category {
  display: inline-block;
  background: #e0f2f1;
  color: #26a69a;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

/* ============ Amazon 购买按钮 ============ */
.btn-amazon {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #ff9800, #ffa726);
  color: #fff;
  padding: 0.9rem 2.5rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(255, 152, 0, 0.35);
}

.btn-amazon:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 152, 0, 0.45);
}

.btn-amazon .cart-icon {
  font-size: 1.3rem;
}

/* ============ Footer ============ */
.footer {
  background: linear-gradient(135deg, #26a69a, #4db6ac);
  color: #fff;
  padding: 2.5rem 0;
  margin-top: auto;
}

.footer .footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  opacity: 0.95;
}

.footer p, .footer li {
  font-size: 0.9rem;
  opacity: 0.85;
  line-height: 1.8;
}

.footer ul {
  list-style: none;
}

.footer .footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.85rem;
  opacity: 0.7;
}

/* ============ 管理后台 ============ */
.admin-page {
  padding: 2rem 0;
  flex: 1;
}

.admin-page h1 {
  color: #333;
  margin-bottom: 0.5rem;
}

.admin-page .section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

/* 密码验证 */
.login-box {
  max-width: 400px;
  margin: 4rem auto;
  text-align: center;
  padding: 2.5rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border: 1px solid #e0f2f1;
}

.login-box h2 {
  margin-bottom: 1.5rem;
  color: #333;
}

.login-box input {
  width: 100%;
  padding: 0.8rem;
  border: 2px solid #e0f2f1;
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.login-box input:focus {
  border-color: #26a69a;
}

/* 表单样式 */
.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: #555;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: #26a69a;
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: #26a69a;
  color: #fff;
  box-shadow: 0 2px 8px rgba(38, 166, 154, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 14px rgba(38, 166, 154, 0.4);
}

.btn-danger {
  background: #f44336;
  color: #fff;
}

.btn-secondary {
  background: #e0e0e0;
  color: #555;
}

.btn-sm {
  padding: 0.35rem 0.8rem;
  font-size: 0.85rem;
}

/* 表格 */
.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  margin-bottom: 2rem;
}

.admin-table th,
.admin-table td {
  padding: 0.9rem 1rem;
  text-align: left;
  border-bottom: 1px solid #f0f0f0;
}

.admin-table th {
  background: #e0f2f1;
  color: #333;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
}

.admin-table td {
  font-size: 0.9rem;
  color: #555;
}

.admin-table .actions {
  display: flex;
  gap: 0.4rem;
}

/* 表单卡片 */
.form-card {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #e0f2f1;
  margin-bottom: 2rem;
}

.form-card h3 {
  margin-bottom: 1.2rem;
  color: #333;
  padding-bottom: 0.8rem;
  border-bottom: 2px solid #e0f2f1;
}

/* 图片预览 */
.image-preview {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid #e0f2f1;
  margin-top: 0.5rem;
  background: #f5f5f5;
}

/* Tabs */
.admin-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid #e0f2f1;
  padding-bottom: 0;
}

.admin-tabs .tab-btn {
  padding: 0.6rem 1.5rem;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  color: #888;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color 0.2s, border-color 0.2s;
}

.admin-tabs .tab-btn.active {
  color: #26a69a;
  border-bottom-color: #26a69a;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* 提示消息 */
.toast {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  color: #fff;
  font-weight: 600;
  z-index: 1000;
  animation: slideIn 0.3s ease;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.toast.success { background: #4caf50; }
.toast.error { background: #f44336; }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .product-detail .detail-wrapper {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .footer .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
  .banner h1 {
    font-size: 1.6rem;
  }
  .navbar .container {
    flex-direction: column;
    gap: 0.5rem;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .footer .footer-content {
    grid-template-columns: 1fr;
  }
  .detail-wrapper .detail-info h2 {
    font-size: 1.4rem;
  }
}