/* ========== 基础 ========== */
:root{
  --school-red:#9F2925;        /* 校徽标准色 R159 G41 B37 */
  --school-red-dark:#7C1F1C;
  --nav-red:#8E211D;
  --ink:#333;
  --ink-light:#666;
  --hero-blue-1:#0A1A45;
  --hero-blue-2:#12367C;
  --line:#e6e6e6;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;color:var(--ink);background:#f5f5f5;font-size:15px;line-height:1.8;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{width:1200px;max-width:94%;margin:0 auto;}
b{color:var(--school-red-dark);}

/* ========== 顶部细条 ========== */
.topbar{background:var(--school-red-dark);color:#f3d9d8;font-size:12.5px;}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:32px;}
.topbar-right a{margin-left:16px;color:#fff;opacity:.92;}
.topbar-right a:hover{opacity:1;text-decoration:underline;}

/* ========== 校名头区 ========== */
.site-header{background:#fff;border-bottom:1px solid var(--line);}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;}
.brand{display:flex;align-items:center;gap:14px;}
.brand-emblem{width:72px;height:72px;object-fit:contain;}
.brand-text{display:flex;flex-direction:column;}
.brand-college{font-size:15px;color:var(--school-red);letter-spacing:2px;}
.brand-title{font-size:26px;color:var(--school-red);letter-spacing:3px;line-height:1.25;font-family:"STZhongsong","SimSun",serif;}
.brand-sub{font-size:13px;color:var(--ink-light);letter-spacing:6px;}
.header-tel{font-size:13px;color:var(--ink-light);}
.header-tel b{color:var(--school-red);}

/* ========== 主导航 ========== */
.mainnav{background:var(--nav-red);}
.mainnav ul{list-style:none;display:flex;}
.mainnav li{flex:1;text-align:center;}
.mainnav a{display:block;color:#fff;font-size:16px;letter-spacing:2px;padding:13px 0;transition:background .2s;}
.mainnav a:hover,.mainnav a.active{background:var(--school-red-dark);font-weight:bold;}

/* ========== 主视觉（参考实验空间详情页） ========== */
.hero{
  background:
    radial-gradient(ellipse at 85% 20%, rgba(60,120,255,.18), transparent 55%),
    radial-gradient(ellipse at 15% 90%, rgba(40,80,200,.22), transparent 50%),
    linear-gradient(115deg,var(--hero-blue-1) 0%,#0E2A66 55%,var(--hero-blue-2) 100%);
  position:relative;overflow:hidden;
}
.hero::before{ /* 科技网格纹理 */
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:linear-gradient(115deg,rgba(0,0,0,.9),rgba(0,0,0,.2));
  -webkit-mask-image:linear-gradient(115deg,rgba(0,0,0,.9),rgba(0,0,0,.2));
}
.hero::after{ /* 光斑点缀 */
  content:"";position:absolute;right:-60px;top:-60px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(90,140,255,.25),transparent 70%);
}
.hero-inner{position:relative;z-index:1;display:flex;gap:36px;padding:44px 0 52px;}
.hero-left{flex:1.15;color:#fff;}
.hero-title{font-size:30px;letter-spacing:1px;line-height:1.4;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.35);}
.hero-meta-line{font-size:14px;color:#cdd9f5;margin-bottom:10px;}
.hero-meta-line i{font-style:normal;margin:0 10px;opacity:.5;}
.hero-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px;}
.hero-chips span{font-size:12.5px;color:#dfe8ff;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);padding:3px 12px;border-radius:14px;}
.hero-desc{font-size:14px;color:#e7edfb;line-height:1.95;text-align:justify;margin-bottom:22px;}
.hero-desc b{color:#ffd9a0;font-weight:bold;}
.hero-actions{display:flex;gap:14px;}
.btn-primary{background:#2E6BE6;color:#fff;font-size:15px;padding:10px 30px;border-radius:4px;letter-spacing:2px;transition:background .2s;}
.btn-primary:hover{background:#1F55C4;}
.btn-ghost{border:1px solid rgba(255,255,255,.55);color:#fff;font-size:15px;padding:10px 26px;border-radius:4px;letter-spacing:2px;transition:background .2s;}
.btn-ghost:hover{background:rgba(255,255,255,.12);}

/* 右侧视频区（样式对齐实验空间详情页右上角） */
.hero-right{flex:1;min-width:420px;display:flex;flex-direction:column;}
.video-switch{display:flex;justify-content:flex-end;align-items:center;gap:14px;margin-bottom:10px;}
.vtab{color:#fff;font-size:15px;letter-spacing:1px;opacity:.82;padding-bottom:3px;border-bottom:2px solid transparent;transition:all .2s;cursor:pointer;}
.vtab:hover{opacity:1;}
.vtab.active{opacity:1;font-weight:bold;border-bottom:2px solid #fff;}
.vsep{width:1px;height:14px;background:rgba(255,255,255,.55);}
.video-box{position:relative;background:#000;border-radius:4px;overflow:hidden;box-shadow:0 8px 26px rgba(0,0,0,.45);aspect-ratio:16/9;}
.video-box video{width:100%;height:100%;object-fit:contain;background:#000;display:block;}
.video-tip[hidden]{display:none;}
.video-tip{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(6,16,44,.72);color:#dfe8ff;font-size:15px;letter-spacing:2px;}
.video-foot{display:flex;justify-content:space-between;align-items:center;margin-top:8px;color:#c3d0f0;font-size:13px;}
.report{opacity:.75;cursor:pointer;}
.report:hover{opacity:1;text-decoration:underline;}

/* ========== 数据条 ========== */
.stats{margin-top:-26px;position:relative;z-index:2;}
.stats-inner{background:#fff;border-radius:6px;box-shadow:0 4px 18px rgba(0,0,0,.08);display:flex;padding:18px 10px;}
.stat{flex:1;text-align:center;border-right:1px dashed var(--line);}
.stat:last-child{border-right:none;}
.stat b{display:block;font-size:34px;color:var(--school-red);font-family:Georgia,"Times New Roman",serif;line-height:1.2;}
.stat span{font-size:13px;color:var(--ink-light);}

/* ========== 主体两栏 ========== */
.main{padding:26px 0 10px;}
.main-cols{display:flex;gap:20px;align-items:flex-start;}
.content-card{flex:1;background:#fff;border-radius:6px;box-shadow:0 2px 12px rgba(0,0,0,.05);padding:26px 30px 34px;}
.card-tabs{display:flex;gap:6px;border-bottom:2px solid var(--line);margin-bottom:22px;flex-wrap:wrap;}
.ctab{padding:9px 18px;font-size:15.5px;color:var(--ink-light);border-bottom:2px solid transparent;margin-bottom:-2px;transition:all .2s;}
.ctab:hover{color:var(--school-red);}
.ctab.active{color:var(--school-red);font-weight:bold;border-bottom-color:var(--school-red);}
.pane h2{font-size:20px;color:var(--school-red-dark);margin-bottom:14px;padding-left:10px;border-left:4px solid var(--school-red);}
.pane h3{font-size:15.5px;color:#444;margin:16px 0 8px;}
.pane p{text-align:justify;margin-bottom:10px;color:#444;}
.kp-list,.method-list{margin:6px 0 12px 22px;color:#444;}
.kp-list li{margin-bottom:6px;}
.method-list{list-style:none;margin-left:0;}
.method-list li{margin-bottom:10px;padding-left:16px;position:relative;}
.method-list li::before{content:"";position:absolute;left:0;top:12px;width:6px;height:6px;background:var(--school-red);border-radius:50%;}
.note{font-size:13px;color:#888;margin-top:12px;}

/* 表格 */
.table-scroll{overflow-x:auto;}
.step-table{width:100%;border-collapse:collapse;font-size:13.5px;margin:8px 0;}
.step-table th{background:var(--school-red);color:#fff;padding:9px 8px;font-weight:normal;white-space:nowrap;}
.step-table td{border:1px solid #eee;padding:8px 10px;color:#444;text-align:justify;}
.step-table tr:nth-child(even) td{background:#faf7f6;}
.step-table td:first-child,.step-table td:nth-child(4),.step-table td:nth-child(5){text-align:center;}

/* ========== 侧栏 ========== */
.sidebar{width:300px;flex-shrink:0;display:flex;flex-direction:column;gap:16px;}
.side-card{background:#fff;border-radius:6px;box-shadow:0 2px 12px rgba(0,0,0,.05);padding:18px 20px;}
.side-card h4{font-size:15.5px;color:var(--school-red-dark);padding-bottom:8px;border-bottom:1px solid var(--line);margin-bottom:10px;}
.side-card p{font-size:13.5px;color:#555;margin-bottom:6px;text-align:justify;}
.side-card a{color:var(--school-red);}
.side-card a:hover{text-decoration:underline;}
.side-note{color:#999;font-size:12.5px;}
.browser-icons{display:flex;gap:10px;margin:6px 0;}
.browser-icons span{font-size:12.5px;color:#fff;padding:4px 12px;border-radius:3px;}
.bchrome{background:#3b82f6;}
.bedge{background:#0ea5e9;}
.bfirefox{background:#f97316;}

/* ========== 教学特色 ========== */
.feature{background:#fff;margin-top:22px;padding:34px 0 44px;border-top:3px solid var(--school-red);}
.sec-title{font-size:22px;color:var(--school-red-dark);text-align:center;margin-bottom:26px;letter-spacing:4px;}
.sec-title::after{content:"";display:block;width:52px;height:3px;background:var(--school-red);margin:10px auto 0;}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.f-item{background:#faf7f6;border:1px solid #f0e4e3;border-radius:6px;padding:22px 20px;transition:transform .2s,box-shadow .2s;}
.f-item:hover{transform:translateY(-4px);box-shadow:0 8px 20px rgba(159,41,37,.12);}
.f-num{font-size:30px;color:rgba(159,41,37,.25);font-family:Georgia,serif;margin-bottom:6px;}
.f-item h3{font-size:16px;color:var(--school-red-dark);margin-bottom:8px;}
.f-item p{font-size:13.5px;color:#555;text-align:justify;}

/* ========== 内容卡“查看详情”链接 ========== */
.more-link{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);font-size:13.5px;}
.more-link a{color:var(--school-red);}
.more-link a:hover{text-decoration:underline;}

/* ========== 面向对象 / 教学支撑（首页概览） ========== */
.extra{background:#fff;padding:34px 0 40px;border-top:3px solid var(--school-red);}
.extra.alt{background:#faf7f6;border-top-color:#e2cfcd;}
.extra-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.e-item{background:#faf7f6;border:1px solid #f0e4e3;border-radius:6px;padding:20px 22px;}
.extra.alt .e-item{background:#fff;border-color:#ece2e1;}
.e-item h3{font-size:16px;color:var(--school-red-dark);margin-bottom:8px;font-weight:normal;}
.e-item p{font-size:13.5px;color:#555;text-align:justify;line-height:1.85;}
.e-item ul{margin:6px 0 0 18px;font-size:13.5px;color:#555;}
.e-item ul li{margin-bottom:4px;}
.e-more{display:block;text-align:center;margin-top:22px;font-size:14.5px;color:var(--school-red);}
.e-more:hover{text-decoration:underline;}

/* ========== 页脚 ========== */
.footer{background:var(--school-red-dark);color:#e8c9c7;margin-top:0;}
.footer-inner{display:flex;align-items:center;gap:26px;padding:26px 0;}
.footer-emblem{width:150px;background:#fff;padding:6px;border-radius:4px;}
.f-title{color:#fff;font-size:17px;letter-spacing:2px;margin-bottom:6px;}
.f-line{font-size:13px;margin-bottom:4px;}
.f-copy{font-size:12.5px;opacity:.75;margin-top:8px;}

/* ========== 响应式 ========== */
@media (max-width:1024px){
  .hero-inner{flex-direction:column;}
  .hero-right{min-width:0;}
  .main-cols{flex-direction:column;}
  .sidebar{width:100%;}
  .feature-grid{grid-template-columns:repeat(2,1fr);}
  .extra-grid{grid-template-columns:1fr;}
  .stats-inner{flex-wrap:wrap;}
  .stat{flex:1 1 33%;margin-bottom:8px;}
}
@media (max-width:640px){
  .feature-grid{grid-template-columns:1fr;}
  .mainnav ul{flex-wrap:wrap;}
  .mainnav li{flex:1 1 25%;}
  .header-tel{display:none;}
}