/* 1. 引入字体 */
@import url('https://fonts.googleapis.com/css2?family=ZCOOL+QingKe+HuangYou&family=Black+Ops+One&family=Noto+Sans+SC:wght@400;900&display=swap');

:root {
    --gold: #d4af37;
    --blood: #ff1a1a;
    --void: #050505;
    --tech-blue: #00f3ff;
}

/* 全局滚动条美化 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #000; }
::-webkit-scrollbar-thumb { background: var(--gold); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #fff; }

/* 防止内容溢出关键代码 */
* { box-sizing: border-box; }

body {
    margin: 0; padding: 0;
    background: #000; color: #fff;
    font-family: 'Noto Sans SC', sans-serif;
    height: 100vh; width: 100vw;
    overflow-x: hidden; 
    overflow-y: auto; 
}

/* 视频背景 */
.video-bg {
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: -2; object-fit: cover;
    filter: brightness(0.6) contrast(1.1);
}

.bg-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.2), rgba(0,0,0,0.8)), repeating-linear-gradient(45deg, rgba(0,0,0,0.4) 0px, rgba(0,0,0,0.5) 2px, rgba(0,0,0,0.4) 4px);
    z-index: -1; pointer-events: none;
}
.scanlines {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 4px, 6px 100%;
    z-index: -1; pointer-events: none; opacity: 0.5;
}

/* 品牌区 (电脑端靠左) */
.brand-column {
    position: absolute; top: 50px; left: 80px; z-index: 10;
    user-select: none; cursor: default;
    display: flex; flex-direction: column;
    align-items: flex-start !important; 
}

.vertical-text {
    writing-mode: vertical-rl;
    font-size: 9rem; font-weight: 400; letter-spacing: 2px;
    font-family: 'ZCOOL QingKe HuangYou', sans-serif;
    color: transparent; 
    background: linear-gradient(to right, #8a6e20 0%, #ffd700 40%, #fff4cc 50%, #d4af37 60%, #3d2b00 100%);
    background-size: 200% auto; -webkit-background-clip: text; background-clip: text;
    -webkit-text-stroke: 2px #3d2b00;
    filter: drop-shadow(5px 5px 0px rgba(0,0,0,0.8)) drop-shadow(0 0 15px rgba(212, 175, 55, 0.4));
    position: relative; transition: all 0.3s; animation: shine 5s linear infinite;
    max-height: 80vh;
}
@keyframes shine { to { background-position: 200% center; } }
.vertical-text:hover { transform: scale(1.02); filter: drop-shadow(8px 8px 2px rgba(0,0,0,1)) drop-shadow(0 0 30px rgba(255, 215, 0, 0.9)); }

.slogan {
    margin-top: 25px; font-size: 1.3rem; color: #eee;
    letter-spacing: 4px; border-left: 6px solid var(--blood); padding-left: 15px;
    text-shadow: 2px 2px 4px rgba(0,0,0,1); font-weight: 900;
}

/* 导航 (电脑端靠左) */
.rune-nav {
    margin-top: 70px; display: flex; flex-direction: column; gap: 30px;
    align-items: flex-start !important;
    flex-direction: column !important;
}
.rune-link {
    text-decoration: none; color: #aaa; font-size: 1.3rem;
    transition: 0.3s; display: flex; align-items: center; gap: 15px;
    font-weight: 900; text-transform: uppercase;
}
.rune-link span { font-family: 'Black Ops One', sans-serif; font-size: 1rem; color: #000; background: var(--gold); padding: 4px 8px; border-radius: 2px; }
.rune-link:hover { color: #fff; transform: translateX(15px); text-shadow: 0 0 15px var(--gold); }
.rune-link:hover span { background: #fff; color: #000; box-shadow: 0 0 15px #fff; }

/* 按钮区 */
.main-action { position: absolute; bottom: 100px; left: 400px; z-index: 10; }
.server-status {
    font-family: 'Courier New'; font-size: 0.9rem; color: #bbb;
    margin-bottom: 20px; background: rgba(0,0,0,0.6); padding: 5px 10px; display: inline-block;
}
.cyber-btn {
    display: inline-block; position: relative; padding: 25px 70px;
    background: var(--gold); color: #000; text-decoration: none;
    font-weight: 900; font-size: 1.6rem;
    clip-path: polygon(10% 0, 100% 0, 100% 70%, 90% 100%, 0 100%, 0 30%);
    transition: 0.2s; box-shadow: 0 0 30px rgba(212, 175, 55, 0.3);
}
.cyber-btn:hover { background: #fff; transform: scale(1.05); box-shadow: 0 0 60px rgba(212, 175, 55, 0.7); }
.btn-tag { position: absolute; top: 5px; right: 5px; font-size: 0.7rem; background: #000; color: #fff; padding: 3px 6px; }

/* HUD */
.boss-hud {
    position: fixed; right: 50px; top: 50%; transform: translateY(-50%);
    width: 350px; background: rgba(10, 10, 10, 0.9);
    border-top: 3px solid var(--blood); backdrop-filter: blur(10px); z-index: 99;
    padding: 0; transition: 0.4s ease;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}
.boss-hud.collapsed { transform: translateY(-50%) translateX(120%); }
.hud-header { background: rgba(255, 26, 26, 0.15); padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid rgba(255,255,255,0.1); }
.hud-title { color: var(--blood); font-weight: 900; letter-spacing: 2px; font-size: 1.1rem;}
.radar-scan { width: 20px; height: 20px; border: 2px solid var(--blood); border-radius: 50%; position: relative; }
.radar-scan::after { content: ''; position: absolute; top: 50%; left: 50%; width: 100%; height: 2px; background: var(--blood); transform-origin: 0 0; animation: radar-spin 2s linear infinite; }
@keyframes radar-spin { 100% { transform: rotate(360deg); } }
.boss-list { padding: 20px; }
.boss-item { display: flex; align-items: center; margin-bottom: 12px; padding: 12px; background: linear-gradient(90deg, rgba(255,255,255,0.08), transparent); border-left: 3px solid #444; transition: 0.3s; }
.boss-item:hover { border-left-color: var(--gold); background: linear-gradient(90deg, rgba(212,175,55,0.15), transparent); }
.boss-avatar { width: 44px; height: 44px; background: #000; border: 2px solid #555; margin-right: 15px; background-size: cover; background-position: center; }
.boss-detail { flex: 1; }
.b-name { display: block; font-weight: 900; color: #fff; font-size: 1rem; text-shadow: 1px 1px 2px #000;}
.b-loc { display: block; font-size: 0.75rem; color: #888; font-family: 'Courier New'; margin-top: 4px;}
.b-timer { margin-left: auto; font-family: 'Black Ops One', cursive; color: var(--gold); font-size: 1.2rem; text-shadow: 0 0 10px rgba(212, 175, 55, 0.5); }
.b-timer.soon { color: var(--blood); text-shadow: 0 0 15px var(--blood); }
.more-btn { text-align: center; padding: 15px; background: rgba(0,0,0,0.5); color: #888; font-size: 0.9rem; cursor: pointer; border-top: 1px solid #333; transition: 0.2s; font-weight: bold; }
.more-btn:hover { color: #fff; letter-spacing: 2px; background: var(--gold); color: #000;}
.hud-toggle { position: absolute; left: -40px; top: 0; width: 40px; height: 50px; background: var(--blood); color: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer; font-weight: bold; clip-path: polygon(0 0, 100% 0, 100% 100%, 0 85%); font-size: 1.2rem; }

/* 弹窗通用 */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.95); z-index: 1000; display: none; align-items: center; justify-content: center; }
.modal-content { width: 850px; background: #0a0a0a; border: 2px solid #333; box-shadow: 0 0 150px rgba(255, 26, 26, 0.15); position: relative; }
.modal-content::before { content: ''; position: absolute; top: -8px; left: -8px; width: 25px; height: 25px; border-top: 4px solid var(--gold); border-left: 4px solid var(--gold); }
.modal-content::after { content: ''; position: absolute; bottom: -8px; right: -8px; width: 25px; height: 25px; border-bottom: 4px solid var(--gold); border-right: 4px solid var(--gold); }
.modal-header { padding: 25px; background: #111; border-bottom: 2px solid #222; display: flex; justify-content: space-between; }
.modal-header h2 { color: var(--gold); margin: 0; font-weight: 900; letter-spacing: 2px; text-shadow: 0 0 10px rgba(212, 175, 55, 0.5); }
.close-btn { color: #888; font-size: 2.5rem; cursor: pointer; transition: 0.3s; line-height: 1;}
.close-btn:hover { color: var(--blood); transform: rotate(90deg); }
.table-container { padding: 25px; max-height: 70vh; overflow-y: auto; }
.full-schedule-table { width: 100%; border-collapse: collapse; font-family: 'Noto Sans SC', sans-serif; }
.full-schedule-table th { text-align: left; padding: 18px; color: var(--gold); border-bottom: 2px solid var(--gold); font-weight: 900; font-size: 1.1rem; }
.full-schedule-table td { padding: 18px; color: #aaa; border-bottom: 1px solid #222; font-weight: bold; }
.full-schedule-table tr:hover { background: rgba(212, 175, 55, 0.05); color: #fff; }

/* 下载弹窗 */
.modal-content.download-style { width: 700px; border-color: var(--gold); background: linear-gradient(to bottom, #111 0%, #050505 100%); }
.download-body { padding: 30px; }
.dl-grid { display: flex; gap: 30px; }
.dl-left { flex: 1; border-right: 1px solid #333; padding-right: 20px; text-align: left; }
.dl-right { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 20px; }
.ver-label { display: block; font-size: 0.8rem; color: #666; letter-spacing: 2px; }
.ver-num { display: block; font-size: 2.5rem; color: var(--gold); font-family: 'Black Ops One'; margin: 5px 0; }
.ver-desc { color: #888; font-size: 0.9rem; margin-bottom: 20px; }
.dl-specs { background: rgba(255,255,255,0.05); padding: 15px; border-radius: 4px; }
.dl-specs h4 { margin: 0 0 10px 0; color: #aaa; font-size: 0.9rem; }
.dl-specs ul { padding-left: 15px; margin: 0; color: #888; font-size: 0.85rem; line-height: 1.6; }
.dl-big-btn { display: flex; align-items: center; padding: 15px 20px; text-decoration: none; border: 1px solid #444; transition: 0.3s; background: linear-gradient(90deg, rgba(0,0,0,0.5), transparent); }
.dl-big-btn:hover { border-color: var(--gold); transform: translateX(5px); background: rgba(212,175,55,0.1); }
.dl-big-btn .icon { font-size: 2rem; margin-right: 15px; }
.dl-big-btn .btn-text strong { display: block; color: #fff; font-size: 1.1rem; }
.dl-big-btn .btn-text small { color: #666; font-size: 0.8rem; }
.dl-big-btn.primary { border-left: 4px solid var(--gold); }
.dl-big-btn.secondary { border-left: 4px solid #444; }

/* 公告 & 更新 */
.modal-content.notice-style, .modal-content.update-style { width: 600px; border-color: var(--gold); }
.notice-body, .update-body { padding: 30px; max-height: 60vh; overflow-y: auto; }
.single-notice-box { text-align: left; }
.sn-header { border-bottom: 1px solid #333; padding-bottom: 20px; margin-bottom: 20px; }
.sn-tag { background: var(--blood); color: #fff; padding: 2px 6px; font-size: 0.8rem; border-radius: 2px; font-weight: bold; margin-right: 10px; vertical-align: middle; }
.sn-title { display: inline; font-size: 1.4rem; color: var(--gold); margin: 0; vertical-align: middle; font-weight: bold; }
.sn-date { display: block; margin-top: 10px; color: #666; font-size: 0.9rem; font-family: 'Courier New'; }
.sn-content { color: #ccc; line-height: 1.8; font-size: 1rem; }
.sn-content p { margin-bottom: 15px; }
.sn-content ul { background: rgba(255,255,255,0.05); padding: 15px 15px 15px 35px; border-left: 2px solid var(--gold); }
.sn-content li { margin-bottom: 5px; color: #ddd; }
.timeline { position: relative; padding-left: 30px; border-left: 2px solid #333; }
.tl-item { position: relative; margin-bottom: 30px; }
.tl-item::before { content: ''; position: absolute; left: -36px; top: 0; width: 10px; height: 10px; background: var(--gold); border-radius: 50%; border: 2px solid #000; box-shadow: 0 0 10px var(--gold); }
.tl-date { font-family: 'Black Ops One'; color: var(--gold); font-size: 1.2rem; margin-bottom: 5px; opacity: 0.8; }
.tl-content { background: rgba(255,255,255,0.05); padding: 15px; border-radius: 4px; border-left: 2px solid #444; }
.tl-content h3 { margin: 0 0 10px 0; font-size: 1rem; color: #fff; }
.tl-content ul { padding-left: 20px; margin: 0; color: #999; font-size: 0.9rem; }
.tl-content li { margin-bottom: 5px; }

/* 中间大字样式 */
.center-banner {
    position: absolute; top: 48%; left: 50%; transform: translate(-50%, -50%);
    text-align: center; z-index: 5; width: 100%; pointer-events: none;
}
.banner-tag {
    display: inline-block; font-size: 1.2rem; color: #fff;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.6), transparent);
    padding: 5px 40px; margin-bottom: 10px;
    font-family: 'Courier New', sans-serif; letter-spacing: 2px; text-shadow: 0 2px 2px #000;
}
.banner-title {
    margin: 0; font-family: 'ZCOOL QingKe HuangYou', sans-serif;
    font-size: 8rem; line-height: 1; letter-spacing: 5px; font-style: italic;
    background: linear-gradient(to bottom, #fff 0%, #ffd700 30%, #d4af37 60%, #8a6e20 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
    -webkit-text-stroke: 2px #3d2b00;
    filter: drop-shadow(0 10px 0px rgba(0,0,0,0.5)) drop-shadow(0 0 30px rgba(255, 215, 0, 0.4));
    animation: floatTitle 3s ease-in-out infinite;
}
@keyframes floatTitle { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.banner-sub { margin-top: 15px; font-size: 1.5rem; color: #ddd; letter-spacing: 10px; text-shadow: 0 2px 4px #000; font-weight: bold; opacity: 0.9; }

/* =========================== */
/* 适配代码 (重要)             */
/* =========================== */

@media screen and (max-height: 900px) and (min-width: 769px) {
    .vertical-text { font-size: 12vh; }
    .brand-column { top: 20px; left: 40px; }
    .rune-nav { margin-top: 30px; gap: 15px; }
    .main-action { bottom: 50px; left: 300px; }
    .cyber-btn { padding: 15px 40px; font-size: 1.2rem; }
    .banner-title { font-size: 6rem; }
}

@media screen and (max-width: 1366px) {
    .brand-column { left: 40px; top: 30px; }
    .vertical-text { font-size: 7rem; }
    .rune-nav { margin-top: 40px; gap: 20px; }
    .main-action { left: 280px; bottom: 60px; }
    .boss-hud { transform: translateY(-50%) scale(0.85); transform-origin: right center; right: 20px; }
    .boss-hud.collapsed { transform: translateY(-50%) translateX(130%) scale(0.85); }
    .banner-title { font-size: 6rem; }
}

@media screen and (max-width: 1023px) {
    .brand-column { left: 20px; }
    .vertical-text { font-size: 5.5rem; }
    .main-action { left: 220px; bottom: 50px; }
    .boss-hud { transform: translateY(-50%) scale(0.75); right: 10px; }
    .boss-hud.collapsed { transform: translateY(-50%) translateX(140%) scale(0.75); }
}

@media screen and (max-width: 768px) {
    body { overflow-y: auto; height: auto; min-height: 100vh; padding-bottom: 80px; }
    .brand-column { position: relative; top: 0; left: 0; width: 100%; padding-top: 60px; display: flex; flex-direction: column; align-items: center !important; z-index: 10; }
    .vertical-text { writing-mode: horizontal-tb; font-size: 4.5rem; letter-spacing: 2px; margin-bottom: 15px; line-height: 1; text-align: center; width: 100%; max-height: none; }
    .slogan { border-left: none; border-top: 3px solid var(--blood); padding-left: 0; padding-top: 10px; margin-top: 0; text-align: center; font-size: 1rem; }
    .rune-nav { margin-top: 40px; flex-direction: row !important; flex-wrap: wrap; justify-content: center; gap: 20px; width: 100%; padding: 0 20px; box-sizing: border-box; align-items: center !important; }
    .rune-link { font-size: 1.1rem; background: rgba(0,0,0,0.5); padding: 5px 10px; border-radius: 4px; }
    .main-action { position: relative; bottom: auto; left: auto; margin-top: 50px; width: 100%; display: flex; flex-direction: column-reverse; align-items: center; gap: 15px; text-align: center; }
    .cyber-btn { padding: 18px 50px; font-size: 1.4rem; width: 70%; box-sizing: border-box; text-align: center; }
    .server-status { margin-bottom: 0; font-size: 0.8rem; }
    .boss-hud { top: auto !important; bottom: 0 !important; right: 0 !important; left: 0 !important; width: 100% !important; max-width: none; transform: translateY(0); background: rgba(10, 10, 10, 0.98); border: none; border-top: 3px solid var(--gold); clip-path: none; box-shadow: 0 -5px 20px rgba(0,0,0,0.9); height: auto; max-height: 60vh; }
    .boss-hud.collapsed { transform: translateY(calc(100% - 65px)) !important; }
    .hud-toggle { top: -40px; right: 20px; left: auto; width: 60px; height: 40px; clip-path: polygon(10% 0, 90% 0, 100% 100%, 0 100%); background: var(--gold); color: #000; transform: none; font-size: 1.5rem; line-height: 40px; }
    .boss-list { max-height: 50vh; overflow-y: auto; padding-bottom: 20px;}
    .modal-content { width: 95%; max-height: 80vh; }
    
    /* 手机端下载弹窗适配 */
    .modal-content.download-style, .modal-content.notice-style, .modal-content.update-style { width: 90% !important; max-width: 90vw; }
    .dl-grid { flex-direction: column; gap: 20px; }
    .dl-left { border-right: none; border-bottom: 1px solid #333; padding-right: 0; padding-bottom: 20px; }
    .dl-big-btn { width: 100%; box-sizing: border-box; }
    
    /* 修复内容溢出 */
    .notice-body, .update-body { padding: 15px; }
    .sn-content, .tl-content { white-space: normal; word-wrap: break-word; overflow-wrap: break-word; }

    /* ⚠️ 核心修复：手机端中间文字位置 & 大小 */
    .center-banner {
        position: relative; /* 改回 flow 布局，自动排在导航下面，不盖住任何人 */
        top: auto; left: auto; transform: none;
        margin: 30px 0 100px 0; /* 给上面导航、下面按钮留足空隙 */
        z-index: 1; 
    }
    .banner-title {
        font-size: 3.2rem; /* 字号缩小，防止撑破 */
    }
    .banner-sub {
        font-size: 1rem;
        letter-spacing: 2px;
    }
}
@media (max-width: 768px) {
    
    /* 1. 让弹窗变宽，利用手机屏幕空间 */
    .modal-content {
        width: 95% !important;
        padding: 15px !important;
        max-height: 80vh; /* 防止太长超出屏幕 */
        overflow-y: auto;
    }

    /* 2. 隐藏表头 (手机上不需要看 "BOSS/地图/时间" 这几个标题) */
    .full-schedule-table thead {
        display: none;
    }

    /* 3. 把每一行变成一个独立的“卡片” */
    .full-schedule-table tbody tr {
        display: block;
        background: #111;
        border: 1px solid #333;
        margin-bottom: 15px; /* 卡片之间的间距 */
        padding: 15px;
        border-radius: 4px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.5);
    }

    /* 4. 把单元格变成“一行行”显示，而不是“一列列” */
    .full-schedule-table tbody td {
        display: block;
        text-align: left; /* 强制左对齐 */
        padding: 5px 0;
        border: none; /* 去掉原本的表格线 */
        width: 100%;  /* 占满宽度 */
        white-space: normal; /* 允许换行 */
    }

    /* --- 单独美化每一项 --- */

    /* 第一行：BOSS名字 (加大加粗) */
    .full-schedule-table tbody td:nth-child(1) {
        font-size: 1.2rem;
        color: #d4af37 !important; /* 金色 */
        border-bottom: 1px dashed #333;
        padding-bottom: 8px;
        margin-bottom: 8px;
    }

    /* 第二行：地图 (加个小图标前缀) */
    .full-schedule-table tbody td:nth-child(2) {
        color: #aaa;
        font-size: 0.9rem;
    }
    .full-schedule-table tbody td:nth-child(2)::before {
        content: "出没地点：";
        color: #666;
    }

    /* 第三行：时间 (允许自动换行，不再挤成一坨) */
    .full-schedule-table tbody td:nth-child(3) {
        color: #eee;
        font-size: 0.9rem;
        line-height: 1.6;
        word-break: break-all; /* 防止时间连在一起不换行 */
    }
    .full-schedule-table tbody td:nth-child(3)::before {
        content: "刷新时间：";
        display: block; /* 让标题独占一行 */
        color: #666;
        margin-top: 5px;
        margin-bottom: 2px;
    }
}
/* 社群弹窗样式 */
.social-style { max-width: 800px !important; }
.qr-grid { display: flex; justify-content: space-around; align-items: center; gap: 20px; padding: 20px 0; flex-wrap: wrap; }
.qr-item { text-align: center; flex: 1; min-width: 150px; }
.qr-img-box {
    background: #fff;
    padding: 10px;
    border: 2px solid #d4af37;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.2);
    transition: transform 0.3s;
    
    /* ⬇️ 核心修改：不再自适应，直接固定大小 */
    width: 160px;  
    height: 160px; /* 高度也锁死，保证是正方形 */
    margin: 0 auto; /* 让框框在每一列里居中 */
    
    /* 让图片垂直居中 */
    display: flex;
    align-items: center;
    justify-content: center;
}
.qr-img-box:hover { transform: scale(1.05); }
.qr-img-box img {
    width: 100% !important;
    height: 100% !important;
    object-fit: contain; /* 关键：保持比例，绝不拉伸 */
    display: block;
    margin: 0;
}
.qr-title { margin-top: 15px; color: #d4af37; font-size: 1.1rem; font-weight: bold; }
.social-tip { text-align: center; color: #666; margin-top: 20px; font-size: 0.9rem; border-top: 1px dashed #333; padding-top: 15px; }
@media (max-width: 768px) { .qr-grid { flex-direction: column; } .qr-item { width: 70%; margin-bottom: 20px; } }

/* =========================================
   手机端黑屏终极修复 (偷梁换柱法)
   ========================================= */

/* 1. 默认情况下（电脑上），隐藏手机替身 */
.mobile-bg-fallback {
    display: none;
}

/* 2. 手机端专属规则 */
@media (max-width: 768px) {
    
    /* ❌ 彻底隐藏视频标签 (眼不见为净，绝对不会黑屏了) */
    .video-bg {
        display: none !important;
    }

    /* ✅ 显示手机替身 (一张铺满全屏的图) */
    .mobile-bg-fallback {
        display: block !important;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -2; /* 放在最底层 */
        
        /* ⚠️ 确保你上传了 bg.jpg，且文件名大小写一致！ */
        background: url('bg.jpg') no-repeat center center;
        background-size: cover; /* 自动铺满，不拉伸 */
    }
}