/* ========== 基础样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #D4AF37;
    --accent-color: #e74c3c;
    --bg-dark: #1a1a1a;
    --bg-light: #f5f5f5;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #ddd;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-dark);
    background: var(--bg-light);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-text {
    color: white;
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 16px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--secondary-color);
}

.lang-btn {
    background: var(--secondary-color);
    color: var(--primary-color);
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: var(--transition);
}

.lang-btn:hover {
    background: #b8860b;
    transform: translateY(-2px);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 2px;
}

/* ========== Hero区域 ========== */
.hero {
    margin-top: 70px;
    height: 60vh;
    min-height: 400px;
    background: url('') no-repeat center center;
    background-size: cover;
    position: relative;
    display: flex;
    align-items: center;
    /* 工业印刷背景纹理 */
    background-color: #1a1a1a;
    background-image: 
        linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(212, 175, 55, 0.03) 2px,
            rgba(212, 175, 55, 0.03) 4px
        );
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.8) 0%, rgba(26, 26, 26, 0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    overflow: hidden;
}

.search-box input {
    flex: 1;
    padding: 18px 24px;
    font-size: 16px;
    border: none;
    outline: none;
}

.search-box button {
    padding: 18px 36px;
    background: var(--secondary-color);
    color: var(--primary-color);
    border: none;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.search-box button:hover {
    background: #b8860b;
}

/* ========== 滚动轮播Banner ========== */
.banner {
    background: white;
    padding-top: 60px;
    padding-bottom: 60px;
}

.banner-slider {
    position: relative;
    max-width: 1000px;
    margin: 0 auto 30px;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.banner-slide {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.banner-slide.active {
    display: block;
}

.banner-slide .banner-content {
    height: 300px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #34495e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-slide .banner-image-bg {
    position: relative;
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.banner-slide .banner-image-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-slide .banner-text-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.6);
    padding: 30px;
}

.banner-text {
    text-align: center;
    color: white;
    padding: 0 40px;
}

.banner-text h3 {
    font-size: 36px;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.banner-text p {
    font-size: 18px;
    opacity: 0.9;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.banner-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-top: 15px;
}

.banner-controls #bannerPrev {
    margin-right: 20px;
}

.banner-controls .banner-dots {
    margin: 0 40px;
}

.banner-controls #bannerNext {
    margin-left: 20px;
}

.banner-btn {
    width: 48px;
    height: 48px;
    line-height: 48px;
    text-align: center;
    padding: 0;
    border-radius: 50%;
    border: none;
    background: var(--primary-color);
    color: white;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.banner-btn:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: scale(1.1);
}

.banner-dots {
    display: flex;
    gap: 10px;
}

.banner-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.banner-dot.active {
    background: var(--secondary-color);
    transform: scale(1.3);
}

.banner-dot:hover {
    background: var(--secondary-color);
}

/* ========== 二手设备专区 ========== */
.used-equipment {
    background: var(--bg-light);
}

.used-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.used-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.used-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 已售出卡片样式 */
.used-card {
    position: relative;
}

.used-card-sold {
    cursor: not-allowed;
}

.sold-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;
    border-radius: 12px;
}

.sold-overlay span {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    font-size: 24px;
    font-weight: bold;
    padding: 10px 30px;
    border-radius: 8px;
    transform: rotate(-15deg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.used-images {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 5px;
    background: #f8f8f8;
}

.used-image-single {
    grid-template-columns: 1fr;
}

.used-image-item {
    width: 100%;
    height: 180px;
    overflow: hidden;
}

.used-image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.used-card:hover .used-image-item img {
    transform: scale(1.05);
}

.used-info {
    padding: 25px;
}

.used-info h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.used-model {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.used-condition {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 15px;
}

.used-desc {
    color: var(--text-dark);
    line-height: 1.7;
    font-size: 15px;
}

.add-used-form {
    background: white;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    padding: 30px;
}

.add-used-form-inner {
    max-width: 800px;
    margin: 0 auto;
}

/* ========== 通用区块 ========== */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--secondary-color);
    border-radius: 2px;
}

/* ========== 分类网格 ========== */
.categories {
    background: white;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.category-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: var(--card-shadow);
}

.category-card:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-color);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.category-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--bg-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-init {
    color: var(--secondary-color);
    font-size: 36px;
    font-weight: bold;
}

.category-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.category-card p {
    color: var(--text-light);
    margin-bottom: 15px;
}

.count {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

/* ========== 产品网格 ========== */
.search-results,
.category-products {
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 25px;
}

.product-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: #f8f8f8;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-no-image {
    color: var(--text-light);
    text-align: center;
}

.product-no-image span {
    font-size: 48px;
}

.product-info {
    padding: 20px;
}

.product-name {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.product-model {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.product-model strong {
    color: var(--primary-color);
}

/* ========== 分类产品头部 ========== */
.category-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    gap: 20px;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
    font-size: 18px;
}

/* ========== 关于我们 ========== */
.about {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text p {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 30px;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 16px;
}

.feature-icon {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--secondary-color);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.about-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.printing-bg {
    background: var(--bg-light);
    padding: 40px;
    border-radius: 12px;
    text-align: center;
}

.printing-bg p {
    margin-top: 15px;
    color: var(--text-light);
    font-weight: bold;
}

/* ========== 联系我们 ========== */
.contact {
    background: var(--primary-color);
}

.contact .section-title {
    color: white;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.contact-card {
    background: white;
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.contact-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.contact-card h4 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.contact-card p {
    color: var(--text-light);
    font-size: 16px;
    line-height: 1.6;
}

/* ========== 卡片内二维码样式 ========== */
.qrcode-inside-card {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    margin-top: 25px;
}

.qrcode-item-small {
    text-align: center;
}

.qrcode-item-small img {
    width: 110px;
    height: 110px;
    object-fit: contain;
    background: white;
    padding: 5px;
    border-radius: 4px;
    border-width: 5px;
    border-style: solid;
}

.qrcode-item-small:nth-child(1) img {
    border-color: #f7941e; /* 微信二维码橙色 */
}

.qrcode-item-small:nth-child(2) img {
    border-color: #000000; /* WhatsApp二维码黑色 */
}

.qrcode-item-small p {
    margin-top: 8px;
    font-size: 14px;
    color: var(--primary-color);
    font-weight: bold;
}

@media (max-width: 768px) {
    .qrcode-inside-card {
        flex-direction: column;
        gap: 15px;
    }
    
    .qrcode-item-small img {
        width: 90px;
        height: 90px;
    }
}

/* ========== 意见反馈模态框 ========== */
.feedback-modal-content {
    max-width: 800px;
}

.feedback-form-container {
    background: white;
    padding: 0;
}

.feedback-fullwidth {
    grid-template-columns: 1fr !important;
    padding: 30px;
}

/* 新的反馈左右布局 */
.feedback-layout-new {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: start;
    margin-top: 20px;
}

.feedback-intro-left {
    padding: 20px 0;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
}

/* 左侧提示文字 */
.feedback-tip-left {
    text-align: left;
}

.feedback-tip-left p {
    color: var(--text-light);
    font-size: 18px;
    line-height: 2.2;
}

.feedback-form-right {
    padding-left: 30px;
    border-left: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .feedback-layout-new {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feedback-form-right {
        padding-left: 0;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 20px;
    }
}

/* 旧布局保留兼容 */
.feedback-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
    margin-top: 10px;
}

.feedback-left {
    padding: 10px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.feedback-tip {
    text-align: center;
    margin-bottom: 20px;
}

.feedback-tip p {
    color: var(--text-light);
    font-size: 16px;
    line-height: 2;
}

.feedback-right {
    padding-left: 30px;
    border-left: 1px solid var(--border-color);
}

.feedback-right .form-group {
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .feedback-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feedback-right {
        padding-left: 0;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 20px;
    }
}

/* ========== 意见反馈管理列表样式 ========== */
.admin-feedback-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-height: 500px;
    overflow-y: auto;
}

.admin-feedback-item {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.admin-feedback-item:hover {
    border-color: var(--accent-color);
    background: #fff5f5;
}

.feedback-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 10px;
}

.feedback-name {
    font-weight: bold;
    color: var(--primary-color);
}

.feedback-time {
    color: var(--text-light);
    font-size: 13px;
}

.feedback-contact {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 8px;
}

.feedback-content {
    color: var(--text-dark);
    line-height: 1.6;
}

/* 批量删除栏 */
.batch-delete-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    margin-bottom: 15px;
    background: #f8f8f8;
    border-radius: 6px;
}

.batch-count {
    color: var(--text-light);
    font-size: 14px;
}

/* 反馈条目操作区 */
.admin-feedback-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 15px;
}

.feedback-item-content {
    flex: 1;
}

.feedback-item-actions {
    padding-top: 5px;
}

.feedback-delete-btn {
    white-space: nowrap;
}

.feedback-delete-hint {
    color: var(--accent-color);
    font-size: 12px;
    margin-top: 8px;
}

.feedback-qrcode-top {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.feedback-qrcode-top img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    background: white;
    padding: 4px;
    border: 4px solid #f7941e;
    border-radius: 6px;
}

.feedback-qrcode-top p {
    margin-top: 8px;
    font-size: 15px;
    color: var(--primary-color);
    font-weight: 500;
}

.feedback-qrcode {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.feedback-qrcode img {
    width: 150px;
    height: 150px;
    object-fit: contain;
    background: white;
    padding: 5px;
    border: 3px solid #f7941e;
    border-radius: 6px;
}

.feedback-qrcode p {
    margin-top: 10px;
    font-size: 16px;
    color: var(--primary-color);
    font-weight: 500;
}

/* ========== 管理员登录模态框 ========== */
.admin-login-modal-content {
    max-width: 500px;
}

.admin-login-body {
    padding: 30px;
}

.admin-login-form {
    max-width: 400px;
    margin: 0 auto;
}

.admin-login-form .form-group {
    margin-bottom: 25px;
}

.admin-login-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--primary-color);
}

.admin-login-form input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    box-sizing: border-box;
}

.admin-login-form .form-buttons {
    justify-content: center;
    margin-top: 35px;
}

/* ========== 管理员登录和管理 ========== */
.admin-manage {
    background: var(--bg-light);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.admin-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.add-product-form {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.product-list {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    max-height: 600px;
    overflow-y: auto;
}

.admin-product-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.admin-product-item {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.admin-product-item:hover {
    border-color: var(--accent-color);
    background: #fff5f5;
}

.admin-product-item h4 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.delete-hint {
    color: var(--accent-color);
    font-size: 12px;
    margin-top: 5px;
}

.item-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.edit-btn, .delete-btn {
    padding: 5px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.edit-btn {
    background: var(--secondary-color);
    color: var(--primary-color);
}

.edit-btn:hover {
    background: #b8860b;
}

.delete-btn {
    background: var(--accent-color);
    color: white;
}

.delete-btn:hover {
    background: #c0392b;
}

/* 二手设备图片输入框样式 */
.used-image-inputs {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 10px 0;
}

.used-image-input-row {
    padding: 5px 0;
}

.used-image-input-row input[type="file"] {
    padding: 5px 0;
    cursor: pointer;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--primary-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    font-family: inherit;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-buttons {
    display: flex;
    gap: 15px;
}

.primary-btn,
.secondary-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.primary-btn {
    background: var(--primary-color);
    color: white;
}

.primary-btn:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
}

.primary-btn:active {
    transform: scale(0.97);
}

.secondary-btn {
    background: var(--border-color);
    color: var(--text-dark);
}

.secondary-btn:hover {
    background: var(--text-light);
    color: white;
}

.secondary-btn:active {
    transform: scale(0.97);
}

.add-message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 6px;
    text-align: center;
}

.add-message.success {
    background: #d4edda;
    color: #155724;
}

.add-message.error {
    background: #f8d7da;
    color: #721c24;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--primary-color);
    color: white;
    padding: 30px 0;
    text-align: center;
}

.footer p {
    opacity: 0.9;
}

/* ========== 管理员标签页 ========== */
.admin-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.admin-tab-btn {
    padding: 10px 20px;
    border: none;
    background: var(--bg-light);
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    font-weight: bold;
    color: var(--text-light);
    transition: var(--transition);
}

.admin-tab-btn:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
}

.admin-tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.admin-tab-content {
    display: none;
}

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

/* ========== 模态框 ========== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
    background-color: white;
    margin: 2% auto;
    padding: 0;
    border-radius: 12px;
    width: 98%;
    max-width: 1400px;
    max-width: 800px;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.close-modal {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 30px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
    z-index: 10;
}

.close-modal:hover {
    color: var(--primary-color);
}

.modal-body {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 30px;
    padding: 30px;
}

.product-detail-image img {
    width: 100%;
    border-radius: 8px;
}

.no-image {
    width: 100%;
    height: 300px;
    background: var(--bg-light);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.no-image span {
    font-size: 64px;
    margin-bottom: 10px;
}

.used-modal {
    max-width: 900px;
}

.used-detail-images {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.used-detail-item img {
    width: 100%;
    border-radius: 8px;
}

.product-detail-info h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 28px;
}

.product-detail-info p {
    margin-bottom: 10px;
    font-size: 16px;
}

.product-detail-info .product-description p {
    line-height: 1.8;
    color: var(--text-light);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .admin-content {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-body {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .used-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 12px;
        padding: 0 10px;
    }
    
    .product-image {
        height: 120px;
    }
    
    .product-info {
        padding: 10px;
    }
    
    .product-info h4 {
        font-size: 14px;
    }
    
    .product-info p {
        font-size: 12px;
    }
    
    .category-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
        padding: 0 10px;
    }
    
    .category-card {
        padding: 20px;
    }
    
    .category-card h3 {
        font-size: 18px;
    }
    
    .category-card p {
        font-size: 13px;
    }
}

/* ========== 轮播Banner额外样式 ========== */
#bannerPrev, #bannerNext {
    display: none;
}
@media (min-width: 768px) {
    #bannerPrev, #bannerNext {
        display: flex;
    }
}


/* ========== 移动端菜单补充样式 ========== */
@media (max-width: 768px) {
    .nav-links.mobile-open {
        display: flex !important;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(44, 62, 80, 0.98);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }
}