/* 促销页面样式 - 使用CSS变量 */

/* 促销横幅 */
.promotion-banner {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    color: var(--text-light);
    padding: var(--spacing-xxl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.promotion-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}
@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}
.banner-content {
    position: relative;
    z-index: 2;
}
.banner-text h2 {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}
.banner-text p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

/* 倒计时组件 */
.countdown-timer {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}
.countdown-item {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: var(--radius-lg);
    min-width: 80px;
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    animation: fadeInScale 0.8s ease forwards;
    opacity: 0;
    transform: scale(0.8);
}
.countdown-item:nth-child(1) { animation-delay: 0.1s; }
.countdown-item:nth-child(2) { animation-delay: 0.2s; }
.countdown-item:nth-child(3) { animation-delay: 0.3s; }
.countdown-item:nth-child(4) { animation-delay: 0.4s; }
@keyframes fadeInScale {
    to {
        opacity: 1;
        transform: scale(1);
    }
}
.countdown-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.countdown-item:hover::before {
    opacity: 1;
}
.countdown-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    background: rgba(255,255,255,0.25);
}
.countdown-number {
    font-size: var(--font-size-xxl);
    font-weight: 800;
    display: block;
    margin-bottom: var(--spacing-xs);
    position: relative;
    z-index: 2;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}
.countdown-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    font-weight: 500;
    position: relative;
    z-index: 2;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 产品分类筛选 */
.filter-section {
    background: var(--bg-primary);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
}
.filter-tab {
    padding: var(--spacing-md) var(--spacing-xl);
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: var(--radius-xl);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: var(--font-size-md);
    position: relative;
    overflow: hidden;
    min-width: 120px;
    text-align: center;
}
.filter-tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    transition: left 0.3s ease;
    z-index: -1;
}
.filter-tab:hover::before,
.filter-tab.active::before {
    left: 0;
}
.filter-tab:hover,
.filter-tab.active {
    color: var(--text-light);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(139, 69, 19, 0.3);
    border-color: transparent;
}
.filter-tab:hover {
    transform: translateY(-3px) scale(1.05);
}
.filter-tab.active {
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .countdown-timer {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }
    .countdown-item {
        min-width: 70px;
        padding: var(--spacing-md);
    }
    .countdown-number {
        font-size: var(--font-size-xl);
    }
    .filter-tabs {
        gap: var(--spacing-sm);
    }
    .filter-tab {
        min-width: 100px;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}
@media (max-width: 480px) {
    .countdown-timer {
        gap: var(--spacing-xs);
    }
    .countdown-item {
        min-width: 60px;
        padding: var(--spacing-sm);
    }
    .countdown-number {
        font-size: var(--font-size-lg);
    }
    .countdown-label {
        font-size: var(--font-size-xs);
    }
    .filter-tabs {
        flex-direction: column;
        align-items: center;
    }
    .filter-tab {
        width: 200px;
        text-align: center;
    }
}

/* 产品列表 */
.promotion-products {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-primary);
}
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}
.product-card.promotion {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
}
.product-card.promotion:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}
.product-image {
    height: 220px;
    overflow: hidden;
    position: relative;
}
.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}
.product-card.promotion:hover .product-image img {
    transform: scale(1.08);
}
.discount-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: linear-gradient(135deg, var(--danger-color) 0%, #ff4757 100%);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    z-index: 2;
    box-shadow: 0 4px 15px rgba(255, 71, 87, 0.3);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.08); }
    100% { transform: scale(1); }
}
.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}
.product-card.promotion:hover .product-overlay {
    opacity: 1;
}
.quick-view-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    background: var(--primary-color);
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: 600;
}
.quick-view-btn:hover {
    background: var(--secondary-color);
    transform: scale(1.05);
}
.product-info {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.product-info h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}
.product-info p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}
.price-info {
    margin-bottom: var(--spacing-md);
}
.original-price {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    text-decoration: line-through;
    margin-right: var(--spacing-sm);
}
.current-price {
    font-size: var(--font-size-xl);
    font-weight: bold;
    color: var(--primary-color);
}
.stock-info {
    margin-bottom: var(--spacing-md);
}
.stock-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}
.stock-number {
    color: var(--primary-color);
    font-weight: 600;
}
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    transition: width 0.3s ease;
}
.buy-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    margin-top: var(--spacing-md);
}
.buy-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 优惠活动 */
.promotion-events {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--border-light) 100%);
}
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}
.section-header h2 {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}
.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}
.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}
.event-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-light);
}
.event-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}
.event-card:hover {
    transform: translateY(-5px) scale(1.03);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}
.event-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    transition: var(--transition-normal);
}
.event-card:hover .event-icon {
    transform: scale(1.1);
}
.event-icon i {
    font-size: 2rem;
    color: var(--text-light);
}
.event-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}
.event-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}
.event-details {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}
.event-date {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

/* 响应式补充 */
@media (max-width: 768px) {
    .products-grid {
        grid-template-columns: 1fr;
    }
    .events-grid {
        grid-template-columns: 1fr;
    }
}

/* 限时抢购区 */
.flash-sale {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-primary);
}
.flash-sale-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--border-light) 100%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}
.flash-sale-info h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}
.flash-sale-info p {
    color: var(--text-secondary);
    font-size: var(--font-size-md);
}
.flash-countdown {
    background: var(--primary-color);
    color: var(--text-light);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    letter-spacing: 2px;
    box-shadow: var(--shadow-sm);
}
.flash-products {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}
.flash-product {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    align-items: center;
}
.flash-product:hover {
    transform: translateY(-5px) scale(1.03);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}
.flash-product img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    transition: var(--transition-normal);
}
.flash-product:hover img {
    transform: scale(1.08);
}
.flash-price {
    padding: var(--spacing-md);
    text-align: center;
    width: 100%;
}
.flash-price .original {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-decoration: line-through;
    margin-bottom: var(--spacing-xs);
}
.flash-price .current {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: bold;
    color: var(--primary-color);
}
.flash-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--danger-color);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(255, 71, 87, 0.15);
    animation: pulse 2s infinite;
}

/* 购物车图标 */
.cart-icon {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-fast);
    z-index: 1000;
    font-size: 2rem;
}
.cart-icon:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}
.cart-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger-color);
    color: var(--text-light);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: bold;
    box-shadow: 0 2px 8px rgba(255, 71, 87, 0.15);
}

/* 购物车弹窗 */
.cart-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-md);
}
.cart-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
}
.cart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}
.cart-header h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}
.cart-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}
.cart-close:hover {
    color: var(--danger-color);
}
.cart-items {
    padding: var(--spacing-lg);
    flex: 1;
    overflow-y: auto;
}
.cart-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-light);
}
.cart-item img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}
.item-info {
    flex: 1;
}
.item-info h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-md);
}
.item-info p {
    color: var(--primary-color);
    font-weight: bold;
}
.item-actions button {
    background: var(--danger-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
}
.item-actions button:hover {
    background: #c82333;
}
.cart-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    font-weight: bold;
    font-size: var(--font-size-lg);
}
.checkout-btn {
    background: var(--success-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: var(--font-size-md);
    font-weight: 600;
}
.checkout-btn:hover {
    background: #218838;
}
.cart-empty {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-secondary);
}

/* 响应式补充 */
@media (max-width: 768px) {
    .flash-sale-header {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
    .flash-products {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    .cart-icon {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 50px;
        height: 50px;
    }
}
@media (max-width: 480px) {
    .flash-sale-info h3 {
        font-size: var(--font-size-lg);
    }
    .flash-countdown {
        font-size: var(--font-size-md);
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

@media (min-width: 768px) {
  .promotion-banner,
  .promotion-products,
  .promotion-events,
  .flash-sale {
      margin-top: 70px; /* 适配PC端 */
  }
}
@media (max-width: 767px) {
  .promotion-banner,
  .promotion-products,
  .promotion-events,
  .flash-sale {
      margin-top: 56px; /* 适配移动端，按实际导航栏高度调整 */
  }
}