/* ==================== C7娱乐 全站样式 ==================== */
/* 配色方案仿 sporttery.cn：红色+绿色主题 */

/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background: #f0f0f0;
    color: #333;
    font-size: 14px;
    line-height: 1.6;
    min-width: 1200px;
}
a { color: #333; text-decoration: none; transition: color .2s; }
a:hover { color: #e60012; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
.clearfix::after { content: ""; display: table; clear: both; }

/* Container */
.container { width: 1200px; margin: 0 auto; }

/* ==================== 顶部工具栏 ==================== */
.top-bar {
    background: #e60012;
    color: #fff;
    font-size: 12px;
    line-height: 32px;
    height: 32px;
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar a { color: #fff; margin: 0 8px; font-size: 12px; }
.top-bar a:hover { color: #ffd700; }
.top-bar .hotline { font-weight: bold; }

/* ==================== Header / Logo区 ==================== */
.header {
    background: #fff;
    border-bottom: 3px solid #e60012;
    padding: 10px 0;
}
.header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo .logo-icon {
    width: 60px; height: 60px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: bold; font-size: 20px;
    overflow: hidden;
}
.logo .logo-icon img {
    width: 100%; height: 100%; object-fit: contain;
}
.logo .logo-text { font-size: 28px; font-weight: bold; color: #e60012; }
.logo .logo-sub { font-size: 12px; color: #999; margin-top: 2px; }
.header-right { text-align: right; }
.header-right .service-line { color: #e60012; font-size: 16px; font-weight: bold; }
.header-right .service-desc { font-size: 12px; color: #999; }

/* ==================== 主导航 ==================== */
.main-nav {
    background: linear-gradient(180deg, #00a651, #008c44);
    height: 44px;
    line-height: 44px;
}
.main-nav ul { display: flex; }
.main-nav li { position: relative; }
.main-nav li a {
    display: block;
    padding: 0 18px;
    color: #fff;
    font-size: 15px;
    font-weight: bold;
    transition: background .2s;
}
.main-nav li a:hover,
.main-nav li.active a {
    background: rgba(0,0,0,0.15);
    color: #ffd700;
}
.main-nav li.app-download a {
    background: #e60012;
    color: #fff;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}
/* 下拉菜单 */
.main-nav .dropdown { position: relative; }
.main-nav .dropdown-menu {
    display: none;
    position: absolute;
    top: 44px;
    left: 0;
    background: #fff;
    min-width: 160px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15);
    z-index: 1000;
    border-radius: 0 0 4px 4px;
}
.main-nav .dropdown:hover .dropdown-menu { display: block; }
.main-nav .dropdown-menu li a {
    color: #333;
    font-size: 13px;
    font-weight: normal;
    padding: 8px 20px;
    line-height: 1.6;
    border-bottom: 1px solid #f0f0f0;
}
.main-nav .dropdown-menu li a:hover { background: #f5f5f5; color: #e60012; }

/* ==================== 三栏布局 ==================== */
.main-content { padding: 15px 0; }
.layout-3col { display: flex; gap: 15px; }
.col-left { width: 200px; flex-shrink: 0; }
.col-center { flex: 1; }
.col-right { width: 300px; flex-shrink: 0; }

/* ==================== 左侧菜单 ==================== */
.side-menu { background: #fff; border-radius: 4px; overflow: hidden; }
.side-menu .menu-title {
    background: linear-gradient(180deg, #00a651, #008c44);
    color: #fff;
    padding: 10px 15px;
    font-size: 15px;
    font-weight: bold;
    display: flex; align-items: center; gap: 8px;
}
.side-menu .menu-title i { font-size: 18px; }
.side-menu .menu-group { border-bottom: 1px solid #eee; }
.side-menu .menu-group-title {
    padding: 10px 15px;
    font-weight: bold;
    color: #00a651;
    font-size: 14px;
    background: #f9f9f9;
    display: flex; align-items: center; gap: 6px;
}
.side-menu .menu-group-title img { width: 20px; height: 20px; }
.side-menu .menu-items { padding: 5px 15px 10px; }
.side-menu .menu-items a {
    display: inline-block;
    margin: 2px 4px;
    padding: 2px 8px;
    font-size: 12px;
    color: #666;
    border: 1px solid #ddd;
    border-radius: 3px;
    transition: all .2s;
}
.side-menu .menu-items a:hover {
    border-color: #e60012;
    color: #e60012;
    background: #fff5f5;
}

/* ==================== Banner轮播 ==================== */
.banner-slider {
    position: relative;
    border-radius: 4px;
    overflow: hidden;
    height: 320px;
    background: #000;
}
.banner-slider .slide {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity .8s;
}
.banner-slider .slide.active { opacity: 1; }
.banner-slider .slide img { width: 100%; height: 100%; object-fit: cover; }
.banner-slider .slide-overlay {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    padding: 20px;
    color: #fff;
}
.banner-slider .slide-overlay h3 { font-size: 20px; margin-bottom: 5px; }
.banner-slider .slide-overlay p { font-size: 13px; opacity: 0.9; }
.banner-dots {
    position: absolute;
    bottom: 10px;
    right: 20px;
    display: flex;
    gap: 6px;
}
.banner-dots span {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: background .3s;
}
.banner-dots span.active { background: #e60012; }

/* ==================== 赛事标签切换 ==================== */
.tab-section { background: #fff; border-radius: 4px; margin-top: 15px; }
.tab-header {
    display: flex;
    border-bottom: 2px solid #00a651;
}
.tab-header .tab-item {
    padding: 10px 20px;
    cursor: pointer;
    font-weight: bold;
    color: #666;
    transition: all .2s;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}
.tab-header .tab-item.active {
    color: #00a651;
    border-bottom-color: #00a651;
}
.tab-header .tab-more { margin-left: auto; padding: 10px 15px; color: #999; font-size: 12px; }
.tab-content { display: none; padding: 15px; }
.tab-content.active { display: block; }

/* ==================== 赛事表格 ==================== */
.match-table { width: 100%; border-collapse: collapse; }
.match-table th {
    background: #f5f5f5;
    padding: 8px 10px;
    font-size: 12px;
    color: #666;
    text-align: center;
    border-bottom: 1px solid #eee;
}
.match-table td {
    padding: 10px;
    text-align: center;
    border-bottom: 1px solid #f0f0f0;
    font-size: 13px;
}
.match-table tr:hover { background: #f9f9f9; }
.match-table .team-name { font-weight: bold; color: #333; }
.match-table .vs { color: #e60012; font-weight: bold; }
.match-table .league-tag {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 11px;
    color: #fff;
    background: #00a651;
}
.match-table .league-tag.red { background: #e60012; }
.match-table .league-tag.blue { background: #1e88e5; }
.match-table .league-tag.orange { background: #ff9800; }

/* ==================== 右侧模块 ==================== */
.right-panel { background: #fff; border-radius: 4px; margin-bottom: 15px; overflow: hidden; }
.panel-title {
    background: linear-gradient(90deg, #e60012, #ff4444);
    color: #fff;
    padding: 8px 15px;
    font-size: 14px;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.panel-title.green { background: linear-gradient(90deg, #00a651, #00c853); }
.panel-title .more { color: #ffd700; font-size: 12px; }
.panel-body { padding: 10px 15px; }
.panel-body .news-item {
    padding: 8px 0;
    border-bottom: 1px dashed #eee;
    display: flex;
    gap: 8px;
}
.panel-body .news-item:last-child { border-bottom: none; }
.panel-body .news-item .dot {
    width: 6px; height: 6px;
    background: #e60012;
    border-radius: 50%;
    margin-top: 6px;
    flex-shrink: 0;
}
.panel-body .news-item a {
    font-size: 13px;
    color: #333;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.panel-body .news-item a:hover { color: #e60012; }

/* 联赛资料 */
.league-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; padding: 10px; }
.league-item {
    text-align: center;
    padding: 8px 4px;
    border: 1px solid #eee;
    border-radius: 4px;
    transition: all .2s;
    font-size: 12px;
}
.league-item:hover { border-color: #00a651; background: #f0fff0; }
.league-item img { width: 30px; height: 30px; margin: 0 auto 4px; }

/* 销售时间 */
.sale-time-table { width: 100%; font-size: 12px; }
.sale-time-table th { background: #f5f5f5; padding: 6px; text-align: center; }
.sale-time-table td { padding: 6px; text-align: center; border-bottom: 1px solid #f0f0f0; }

/* ==================== 底部四栏区域 ==================== */
.bottom-section {
    background: linear-gradient(180deg, #00a651, #008c44);
    padding: 20px 0;
    margin-top: 15px;
}
.bottom-4col { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; }
.bottom-col { background: rgba(255,255,255,0.1); border-radius: 4px; padding: 15px; }
.bottom-col h3 {
    color: #ffd700;
    font-size: 16px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.2);
}
.bottom-col .item {
    padding: 5px 0;
    border-bottom: 1px dashed rgba(255,255,255,0.1);
}
.bottom-col .item a { color: #fff; font-size: 13px; opacity: 0.9; }
.bottom-col .item a:hover { opacity: 1; color: #ffd700; }
.bottom-col .video-thumb {
    width: 100%;
    height: 120px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
    position: relative;
}
.bottom-col .video-thumb img { width: 100%; height: 100%; object-fit: cover; }
.bottom-col .video-thumb .play-btn {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 40px; height: 40px;
    background: rgba(230,0,18,0.8);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
}
.bottom-col .video-thumb .play-btn::after {
    content: "";
    border-left: 14px solid #fff;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    margin-left: 3px;
}

/* ==================== Footer ==================== */
.footer {
    background: #2d2d2d;
    color: #999;
    padding: 20px 0;
}
.footer-nav { display: flex; gap: 20px; margin-bottom: 15px; border-bottom: 1px solid #444; padding-bottom: 15px; }
.footer-nav a { color: #ccc; font-size: 13px; }
.footer-nav a:hover { color: #e60012; }
.footer-info { text-align: center; font-size: 12px; line-height: 2; }
.footer-info .brand { color: #e60012; font-weight: bold; }
.footer-links { display: flex; justify-content: center; gap: 15px; margin-top: 10px; }
.footer-links a { color: #999; font-size: 12px; }

/* ==================== 文章页面 ==================== */
.article-page { background: #fff; border-radius: 4px; padding: 30px; }
.article-page .article-title {
    font-size: 24px;
    color: #333;
    text-align: center;
    margin-bottom: 15px;
    line-height: 1.4;
}
.article-page .article-meta {
    text-align: center;
    color: #999;
    font-size: 12px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}
.article-page .article-meta span { margin: 0 10px; }
.article-page .article-content { line-height: 1.8; font-size: 15px; color: #444; }
.article-page .article-content p { margin-bottom: 15px; text-indent: 2em; }
.article-page .article-content img {
    max-width: 100%;
    margin: 15px auto;
    display: block;
    border-radius: 4px;
}
.article-page .article-content h2 {
    font-size: 18px;
    color: #333;
    margin: 20px 0 10px;
    padding-left: 10px;
    border-left: 3px solid #e60012;
}
.article-page .article-tags { margin-top: 20px; padding-top: 15px; border-top: 1px solid #eee; }
.article-page .article-tags span {
    display: inline-block;
    padding: 3px 10px;
    background: #f5f5f5;
    border-radius: 3px;
    font-size: 12px;
    color: #666;
    margin: 3px;
}

/* ==================== 面包屑导航 ==================== */
.breadcrumb {
    padding: 10px 0;
    font-size: 12px;
    color: #999;
}
.breadcrumb a { color: #666; }
.breadcrumb a:hover { color: #e60012; }
.breadcrumb span { margin: 0 5px; }

/* ==================== 列表页 ==================== */
.news-list-page { background: #fff; border-radius: 4px; padding: 20px; }
.news-list-item {
    display: flex;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid #f0f0f0;
}
.news-list-item .thumb {
    width: 200px;
    height: 130px;
    border-radius: 4px;
    overflow: hidden;
    flex-shrink: 0;
}
.news-list-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
.news-list-item .info { flex: 1; }
.news-list-item .info h3 { font-size: 16px; margin-bottom: 8px; }
.news-list-item .info h3 a { color: #333; }
.news-list-item .info h3 a:hover { color: #e60012; }
.news-list-item .info p { font-size: 13px; color: #999; line-height: 1.6; margin-bottom: 8px; }
.news-list-item .info .meta { font-size: 12px; color: #bbb; }

/* ==================== APP下载页 ==================== */
.app-page {
    background: linear-gradient(135deg, #e60012, #ff4444, #00a651);
    min-height: 600px;
    padding: 60px 0;
    text-align: center;
    color: #fff;
}
.app-page h1 { font-size: 42px; margin-bottom: 15px; }
.app-page .subtitle { font-size: 18px; opacity: 0.9; margin-bottom: 40px; }
.app-page .download-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 40px; }
.app-page .download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: bold;
    transition: transform .2s;
}
.app-page .download-btn:hover { transform: scale(1.05); }
.app-page .download-btn.ios { background: #000; color: #fff; }
.app-page .download-btn.android { background: #fff; color: #00a651; }
.app-page .qr-section { margin-top: 30px; }
.app-page .qr-box {
    display: inline-block;
    background: #fff;
    padding: 15px;
    border-radius: 10px;
}
.app-page .qr-box img { width: 150px; height: 150px; }
.app-page .features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
}
.app-page .feature-item {
    text-align: center;
    max-width: 200px;
}
.app-page .feature-item .icon {
    width: 60px; height: 60px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 10px;
    font-size: 28px;
}
.app-page .feature-item h4 { font-size: 16px; margin-bottom: 5px; }
.app-page .feature-item p { font-size: 13px; opacity: 0.8; }

/* ==================== 帮助中心 ==================== */
.help-page { display: flex; gap: 20px; }
.help-sidebar { width: 250px; background: #fff; border-radius: 4px; padding: 15px; }
.help-sidebar h3 {
    font-size: 16px;
    color: #00a651;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #00a651;
}
.help-sidebar a {
    display: block;
    padding: 8px 10px;
    font-size: 13px;
    border-bottom: 1px dashed #eee;
    color: #666;
}
.help-sidebar a:hover { color: #e60012; background: #f9f9f9; }
.help-main { flex: 1; background: #fff; border-radius: 4px; padding: 25px; }

/* ==================== 客服弹窗 ==================== */
.cs-widget {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 9999;
}
.cs-btn {
    width: 60px; height: 60px;
    background: linear-gradient(135deg, #e60012, #ff4444);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(230,0,18,0.4);
    transition: transform .2s;
    color: #fff;
    font-size: 24px;
}
.cs-btn:hover { transform: scale(1.1); }
.cs-btn .badge {
    position: absolute;
    top: -2px; right: -2px;
    width: 18px; height: 18px;
    background: #ffd700;
    border-radius: 50%;
    font-size: 11px;
    color: #e60012;
    display: flex; align-items: center; justify-content: center;
    font-weight: bold;
}
.cs-panel {
    display: none;
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 320px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 5px 30px rgba(0,0,0,0.2);
    overflow: hidden;
}
.cs-panel.active { display: block; }
.cs-panel-header {
    background: linear-gradient(135deg, #e60012, #ff4444);
    color: #fff;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.cs-panel-header h4 { font-size: 16px; }
.cs-panel-header .close-btn { cursor: pointer; font-size: 20px; opacity: 0.8; }
.cs-panel-header .close-btn:hover { opacity: 1; }
.cs-panel-body { padding: 15px; height: 300px; overflow-y: auto; }
.cs-msg {
    margin-bottom: 12px;
    display: flex;
    gap: 8px;
}
.cs-msg.bot { flex-direction: row; }
.cs-msg.user { flex-direction: row-reverse; }
.cs-msg .avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: #e60012;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    font-size: 14px;
    flex-shrink: 0;
}
.cs-msg.user .avatar { background: #00a651; }
.cs-msg .bubble {
    max-width: 220px;
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 13px;
    line-height: 1.5;
}
.cs-msg.bot .bubble { background: #f5f5f5; color: #333; }
.cs-msg.user .bubble { background: #e60012; color: #fff; }
.cs-panel-footer {
    padding: 10px 15px;
    border-top: 1px solid #eee;
    display: flex;
    gap: 8px;
}
.cs-panel-footer input {
    flex: 1;
    border: 1px solid #ddd;
    border-radius: 20px;
    padding: 8px 15px;
    font-size: 13px;
    outline: none;
}
.cs-panel-footer input:focus { border-color: #e60012; }
.cs-panel-footer button {
    background: #e60012;
    color: #fff;
    border: none;
    border-radius: 20px;
    padding: 8px 20px;
    cursor: pointer;
    font-size: 13px;
}
.cs-panel-footer button:hover { background: #cc0010; }

/* ==================== 视频页面 ==================== */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.video-card { background: #fff; border-radius: 4px; overflow: hidden; transition: transform .2s; }
.video-card:hover { transform: translateY(-3px); box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
.video-card .video-cover {
    position: relative;
    height: 180px;
    overflow: hidden;
}
.video-card .video-cover img { width: 100%; height: 100%; object-fit: cover; }
.video-card .video-cover .play-icon {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 50px; height: 50px;
    background: rgba(230,0,18,0.8);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
}
.video-card .video-cover .play-icon::after {
    content: "";
    border-left: 16px solid #fff;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    margin-left: 4px;
}
.video-card .video-info { padding: 12px; }
.video-card .video-info h4 { font-size: 14px; margin-bottom: 5px; line-height: 1.4; }
.video-card .video-info p { font-size: 12px; color: #999; }

/* ==================== 比分直播 ==================== */
.live-score-header {
    background: linear-gradient(135deg, #00a651, #008c44);
    color: #fff;
    padding: 15px 20px;
    border-radius: 4px 4px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.live-indicator { display: flex; align-items: center; gap: 6px; }
.live-indicator .dot {
    width: 8px; height: 8px;
    background: #e60012;
    border-radius: 50%;
    animation: blink 1s infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

/* ==================== 分页 ==================== */
.pagination { display: flex; justify-content: center; gap: 5px; padding: 20px 0; }
.pagination a, .pagination span {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 13px;
    color: #666;
}
.pagination a:hover { border-color: #e60012; color: #e60012; }
.pagination .current { background: #e60012; color: #fff; border-color: #e60012; }

/* ==================== 关于我们 ==================== */
.about-hero {
    background: linear-gradient(135deg, #e60012, #00a651);
    color: #fff;
    padding: 60px 0;
    text-align: center;
}
.about-hero h1 { font-size: 36px; margin-bottom: 10px; }
.about-hero p { font-size: 16px; opacity: 0.9; }
.about-content { background: #fff; border-radius: 4px; padding: 30px; margin-top: 15px; }
.about-content h2 {
    font-size: 20px;
    color: #e60012;
    margin: 25px 0 15px;
    padding-left: 10px;
    border-left: 3px solid #e60012;
}
.about-content p { line-height: 1.8; margin-bottom: 15px; color: #555; }

/* ==================== 网站导航页 ==================== */
.sitemap-section { background: #fff; border-radius: 4px; padding: 20px; margin-bottom: 15px; }
.sitemap-section h2 {
    font-size: 18px;
    color: #00a651;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #00a651;
}
.sitemap-links { display: flex; flex-wrap: wrap; gap: 10px; }
.sitemap-links a {
    display: inline-block;
    padding: 6px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    transition: all .2s;
}
.sitemap-links a:hover { border-color: #e60012; color: #e60012; background: #fff5f5; }

/* ==================== 通用模块 ==================== */
.section-title {
    font-size: 18px;
    color: #333;
    padding: 15px 0 10px;
    border-bottom: 2px solid #e60012;
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.section-title .more { font-size: 12px; color: #999; }

/* 公告滚动 */
.notice-bar {
    background: #fff;
    border-radius: 4px;
    padding: 8px 15px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}
.notice-bar .tag {
    background: #e60012;
    color: #fff;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 12px;
    white-space: nowrap;
}
.notice-bar .notice-content {
    flex: 1;
    overflow: hidden;
    white-space: nowrap;
}
.notice-bar .notice-content a { font-size: 13px; }

/* 返回顶部 */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 90px;
    width: 40px; height: 40px;
    background: #00a651;
    color: #fff;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    z-index: 9998;
    transition: opacity .3s;
}
.back-to-top:hover { background: #008c44; }
.back-to-top.show { display: flex; }

/* ==================== 响应式（最小1200px） ==================== */
@media (max-width: 1200px) {
    body { min-width: auto; }
    .container { width: 100%; padding: 0 15px; }
}