/* ===========================================================
   人工智能+虚拟细胞的构建 —— 项目站点样式
   =========================================================== */
:root{
  --blue:#1e40af;
  --blue-d:#172554;
  --blue-l:#3b82f6;
  --sky:#eff6ff;
  --ink:#111827;
  --gray:#4b5563;
  --gray-l:#9ca3af;
  --line:#e5e7eb;
  --bg:#f7f8fa;
  --card:#ffffff;
  --green:#047857;
  --amber:#b45309;
  --radius:10px;
  --shadow:0 1px 3px rgba(16,24,40,.06),0 6px 20px rgba(16,24,40,.05);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Microsoft YaHei","微软雅黑","PingFang SC","Hiragino Sans GB",sans-serif;
  background:var(--bg);color:var(--ink);
  font-size:15px;line-height:1.85;-webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;display:block;}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px;}

/* ---------- 顶栏 ---------- */
.topbar{background:#0b1a3a;color:#cbd5e1;font-size:13px;}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:38px;gap:16px;}
.topbar a{color:#cbd5e1;}
.topbar .dot{opacity:.45;}
@media(max-width:760px){
  .topbar .wrap{height:auto;padding:6px 16px;flex-wrap:wrap;gap:0 14px;font-size:12px;line-height:1.6;}
}

.site-head{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:60;box-shadow:0 1px 6px rgba(0,0,0,.04);}
.site-head .wrap{display:flex;align-items:center;gap:16px;height:70px;}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;}
.brand img{width:44px;height:44px;object-fit:contain;}
.brand .t1{font-size:18px;font-weight:700;color:var(--blue-d);letter-spacing:.5px;line-height:1.25;white-space:nowrap;}
.brand .t2{font-size:11px;color:var(--gray-l);letter-spacing:.5px;white-space:nowrap;}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px;flex-wrap:wrap;}
.nav a{
  padding:7px 11px;border-radius:6px;font-size:14px;color:var(--gray);
  transition:.15s;white-space:nowrap;
}
.nav a:hover{background:var(--sky);color:var(--blue);text-decoration:none;}
.nav a.on{background:var(--blue);color:#fff;}
.nav-toggle{display:none;margin-left:auto;background:var(--sky);border:0;border-radius:6px;padding:8px 12px;font-size:15px;color:var(--blue);cursor:pointer;}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(135deg,#0f2456 0%,#1e40af 55%,#2563eb 100%);color:#fff;padding:44px 0 0;position:relative;overflow:hidden;}
.hero::after{content:"";position:absolute;right:-140px;top:-140px;width:460px;height:460px;border-radius:50%;background:rgba(255,255,255,.06);}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:38px;align-items:center;padding-bottom:34px;}
.hero h1{font-size:38px;line-height:1.3;font-weight:800;letter-spacing:1px;}
.hero .sub{font-size:16px;color:#bfdbfe;margin-top:12px;}
.hero .tags{margin-top:20px;display:flex;gap:9px;flex-wrap:wrap;}
.hero .tags span{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.28);padding:5px 13px;border-radius:999px;font-size:13px;}
.hero .cta{margin-top:26px;display:flex;gap:12px;flex-wrap:wrap;}
.btn{display:inline-block;background:#fff;color:var(--blue-d);font-weight:700;padding:11px 24px;border-radius:8px;font-size:15px;}
.btn:hover{background:#e0ecff;text-decoration:none;}
.btn.ghost{background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff;}
.btn.ghost:hover{background:rgba(255,255,255,.12);}
.hero-pic{background:rgba(255,255,255,.94);border-radius:14px;padding:10px;box-shadow:0 18px 40px rgba(0,0,0,.28);}
.hero-pic img{border-radius:8px;}

/* 统计条 */
.statbar{background:#fff;border-bottom:1px solid var(--line);}
.statbar .wrap{display:grid;grid-template-columns:repeat(5,1fr);}
.statbar div{padding:18px 10px;text-align:center;border-right:1px solid var(--line);}
.statbar div:last-child{border-right:0;}
.statbar b{display:block;font-size:26px;color:var(--blue);line-height:1.2;}
.statbar span{font-size:12.5px;color:var(--gray);}

/* ---------- 区块 ---------- */
section{padding:46px 0;scroll-margin-top:78px;}
section.alt{background:#fff;}
.sec-head{margin-bottom:26px;}
.sec-head .k{font-size:12px;letter-spacing:2px;color:var(--blue-l);font-weight:700;}
.sec-head h2{font-size:26px;color:var(--blue-d);margin-top:4px;font-weight:800;}
.sec-head p{color:var(--gray);margin-top:8px;max-width:900px;}
.sec-head .bar{width:56px;height:4px;background:var(--blue);margin-top:14px;border-radius:2px;}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;}
.card .inner{padding:22px 24px;}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}

/* 图版块 */
.figure{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden;box-shadow:var(--shadow);}
.figure .fbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 16px;background:#f9fafb;border-bottom:1px solid var(--line);}
.figure .fbar b{font-size:14.5px;color:var(--blue-d);}
.figure .fbar .ops{display:flex;gap:8px;}
.figure img{width:100%;cursor:zoom-in;background:#fff;}
.figure .cap{padding:10px 16px;font-size:13px;color:var(--gray);border-top:1px solid var(--line);background:#fcfcfd;}
.mini{display:inline-block;background:var(--sky);color:var(--blue);border:1px solid #dbeafe;padding:5px 12px;border-radius:6px;font-size:13px;}
.mini:hover{background:#dbeafe;text-decoration:none;}

/* 表格 */
table{width:100%;border-collapse:collapse;background:#fff;font-size:14px;}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top;line-height:1.7;}
th{background:var(--sky);color:var(--blue-d);font-weight:700;white-space:nowrap;}
tbody tr:nth-child(even){background:#fcfcfd;}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);}
.tbl-wrap table{border:0;}
.tbl-wrap th,.tbl-wrap td{border-left:0;border-top:0;}
.tbl-wrap tr td:last-child,.tbl-wrap tr th:last-child{border-right:0;}
.tbl-wrap tr:last-child td{border-bottom:0;}

/* 要素卡 */
.fcard{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow);}
.fcard h4{font-size:16px;color:var(--blue-d);margin-bottom:8px;display:flex;align-items:center;gap:8px;}
.fcard h4 i{background:var(--blue);color:#fff;width:24px;height:24px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-style:normal;font-size:13px;flex:0 0 auto;}
.fcard p{color:var(--gray);font-size:14.5px;}

/* 列表 */
ul.dash{list-style:none;margin-top:8px;}
ul.dash li{position:relative;padding-left:18px;margin-bottom:7px;color:var(--gray);font-size:14.5px;}
ul.dash li::before{content:"";position:absolute;left:0;top:11px;width:7px;height:7px;border-radius:50%;background:var(--blue-l);}
ul.dash li b{color:var(--ink);}

/* 导航卡片 */
.navcards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.navcard{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:.18s;}
.navcard:hover{border-color:var(--blue);transform:translateY(-3px);text-decoration:none;box-shadow:0 10px 26px rgba(30,64,175,.12);}
.navcard h3{font-size:17px;color:var(--blue-d);margin-bottom:6px;}
.navcard p{font-size:13.5px;color:var(--gray);}
.navcard .go{margin-top:12px;font-size:13px;color:var(--blue);font-weight:700;}

/* ---------- 22步交互 ---------- */
.stepper{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;}
.st-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:16px 20px;background:linear-gradient(90deg,#f0f5ff,#fff);border-bottom:1px solid var(--line);}
.st-head .ph{flex:1;min-width:220px;}
.st-head .ph b{font-size:15px;color:var(--blue-d);}
.bar2{height:8px;background:#e5e7eb;border-radius:5px;overflow:hidden;margin-top:8px;}
.bar2 i{display:block;height:100%;background:linear-gradient(90deg,#1e40af,#3b82f6);width:0;transition:.3s;}
.phases{display:flex;gap:6px;flex-wrap:wrap;}
.phases button{
  border:1px solid var(--line);background:#fff;color:var(--gray);border-radius:6px;
  padding:6px 12px;font-size:13px;cursor:pointer;font-family:inherit;transition:.15s;
}
.phases button.on{background:var(--blue);color:#fff;border-color:var(--blue);}
.phases button:hover{border-color:var(--blue);color:var(--blue);}
.phases button.on:hover{color:#fff;}

.st-body{display:grid;grid-template-columns:330px 1fr;}
.st-list{max-height:660px;overflow-y:auto;border-right:1px solid var(--line);background:#fcfcfd;}
.st-item{display:flex;gap:10px;padding:10px 14px;border-bottom:1px solid #f1f3f7;cursor:pointer;align-items:flex-start;transition:.12s;}
.st-item:hover{background:#eef4ff;}
.st-item.on{background:#e0ecff;box-shadow:inset 3px 0 0 var(--blue);}
.st-item .n{
  flex:0 0 auto;width:26px;height:26px;border-radius:50%;background:#fff;border:1px solid var(--line);
  color:var(--gray);font-size:13px;display:flex;align-items:center;justify-content:center;font-weight:700;margin-top:2px;
}
.st-item.on .n{background:var(--blue);border-color:var(--blue);color:#fff;}
.st-item.done .n{background:var(--green);border-color:var(--green);color:#fff;}
.st-item .nm{font-size:14.5px;color:var(--ink);line-height:1.5;}
.st-item .mt{font-size:12px;color:var(--gray-l);}
.st-group{padding:8px 14px;background:#eef2f7;font-size:12.5px;color:var(--blue-d);font-weight:700;letter-spacing:.5px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:2;}

.st-detail{padding:24px 28px;min-height:520px;}
.st-detail .no{display:inline-block;background:var(--blue);color:#fff;font-size:13px;padding:3px 12px;border-radius:999px;}
.st-detail h3{font-size:23px;color:var(--blue-d);margin:10px 0 4px;}
.st-detail .goal{color:var(--gray);font-size:14.5px;}
.meta{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0 6px;}
.meta span{background:var(--sky);border:1px solid #dbeafe;color:var(--blue-d);font-size:13px;padding:4px 12px;border-radius:6px;}
.meta span b{color:var(--blue);}
.kv{margin-top:18px;}
.kv .row{display:grid;grid-template-columns:118px 1fr;gap:14px;padding:13px 0;border-top:1px dashed var(--line);}
.kv .row:first-child{border-top:0;}
.kv .row .k{color:var(--blue-d);font-weight:700;font-size:14px;}
.kv .row .v{color:var(--gray);font-size:14.5px;}
.kv .row .v em{font-style:normal;color:var(--amber);}
.st-nav{display:flex;justify-content:space-between;gap:12px;margin-top:24px;padding-top:18px;border-top:1px solid var(--line);}
.st-nav button{
  border:1px solid var(--line);background:#fff;color:var(--gray);padding:9px 20px;border-radius:6px;
  cursor:pointer;font-family:inherit;font-size:14px;transition:.15s;
}
.st-nav button:hover:not(:disabled){border-color:var(--blue);color:var(--blue);background:var(--sky);}
.st-nav button:disabled{opacity:.4;cursor:not-allowed;}
.score-chip{float:right;background:var(--green);color:#fff;font-size:12.5px;padding:3px 11px;border-radius:999px;margin-top:4px;}

/* ---------- 灯箱 ---------- */
.lb{position:fixed;inset:0;background:rgba(8,15,35,.9);z-index:200;display:none;align-items:center;justify-content:center;padding:26px;cursor:zoom-out;}
.lb.on{display:flex;}
.lb img{max-width:100%;max-height:100%;border-radius:6px;box-shadow:0 20px 60px rgba(0,0,0,.6);cursor:default;}
.lb .x{position:absolute;top:16px;right:22px;color:#fff;font-size:32px;cursor:pointer;line-height:1;}

/* ---------- 页脚 ---------- */
footer{background:#0b1a3a;color:#94a3b8;padding:34px 0 24px;font-size:13px;}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;}
footer .fc{min-width:230px;}
footer h5{color:#e2e8f0;font-size:14px;margin-bottom:8px;}
footer p{line-height:1.9;}
footer .fl{margin-top:20px;padding-top:14px;border-top:1px solid rgba(255,255,255,.12);text-align:center;font-size:12px;color:#64748b;}

/* ---------- 响应式 ---------- */
@media(max-width:1080px){
  .brand .t2{display:none;}
}
@media(max-width:900px){
  .hero .wrap{grid-template-columns:1fr;}
  .hero h1{font-size:28px;}
  .grid2,.grid3,.grid4,.navcards{grid-template-columns:1fr;}
  .statbar .wrap{grid-template-columns:repeat(2,1fr);}
  .statbar div{border-bottom:1px solid var(--line);}
  .st-body{grid-template-columns:1fr;}
  .st-list{max-height:280px;border-right:0;border-bottom:1px solid var(--line);}
  .nav{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;padding:10px;box-shadow:0 8px 20px rgba(0,0,0,.1);border-top:1px solid var(--line);}
  .nav.open{display:flex;}
  .nav a{width:100%;}
  .nav-toggle{display:block;}
  .site-head{position:relative;}
  .st-detail{padding:20px 18px;}
  .kv .row{grid-template-columns:1fr;gap:4px;}
}

/* ---------- 导航 CTA ---------- */
.nav a.nav-cta{
  background:var(--blue);color:#fff;font-weight:700;padding:8px 14px;margin-left:4px;
}
.nav a.nav-cta:hover{background:var(--blue-d);color:#fff;}
.nav a.nav-cta.on{background:var(--blue-d);}

/* ---------- 待填字段 ---------- */
.todo{
  display:inline-block;background:#fffbeb;border:1px dashed #f59e0b;color:#b45309;
  padding:1px 8px;border-radius:4px;font-size:13px;font-weight:700;
}
.notice{
  background:#fffbeb;border:1px solid #fde68a;border-left:4px solid #f59e0b;
  border-radius:6px;padding:14px 18px;font-size:13.5px;color:#78350f;line-height:1.85;
}
.notice b{color:#92400e;}

/* ---------- 步骤条（进入流程） ---------- */
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.steps3 div{padding:22px 24px;border-right:1px solid var(--line);position:relative;}
.steps3 div:last-child{border-right:0;}
.steps3 .sn{width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;margin-bottom:10px;}
.steps3 h4{font-size:16px;color:var(--blue-d);margin-bottom:6px;}
.steps3 p{font-size:13.5px;color:var(--gray);}

/* ---------- 视频占位 ---------- */
.vwrap{position:relative;background:#0b1a3a;border-radius:var(--radius);overflow:hidden;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;color:#93c5fd;text-align:center;}
.vwrap .play{width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.14);border:2px solid rgba(255,255,255,.5);display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:22px;color:#fff;}
.vwrap p{font-size:13.5px;line-height:1.8;}

@media(max-width:900px){.steps3{grid-template-columns:1fr;}.steps3 div{border-right:0;border-bottom:1px solid var(--line);}}

/* 导航在中等宽度收成汉堡，避免 8 项菜单挤压换行 */
@media(max-width:1180px){
  .site-head{position:relative;}
  .nav{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;
       flex-direction:column;align-items:stretch;padding:10px;gap:2px;
       box-shadow:0 8px 20px rgba(0,0,0,.1);border-top:1px solid var(--line);}
  .nav.open{display:flex;}
  .nav a{width:100%;padding:9px 12px;}
  .nav a.nav-cta{margin-left:0;margin-top:6px;text-align:center;}
  .nav-toggle{display:block;}
}

/* ---------- Hero 区 3D 动物细胞模块 ---------- */
.hero-cell{
  background:rgba(255,255,255,.94);border-radius:14px;overflow:hidden;
  box-shadow:0 18px 40px rgba(0,0,0,.28);
}
.hero-cell-bar{
  display:flex;align-items:center;gap:7px;padding:9px 14px;
  background:#f9fafb;border-bottom:1px solid var(--line);
}
.hero-cell-bar .hd{width:10px;height:10px;border-radius:50%;flex:none}
.hero-cell-bar .hd.r{background:#f87171}
.hero-cell-bar .hd.y{background:#fbbf24}
.hero-cell-bar .hd.g{background:#34d399}
.hero-cell-bar .tt{font-size:13px;font-weight:700;color:var(--blue-d);margin-left:6px;white-space:nowrap}
.hero-cell-bar .tg{margin-left:auto;font-size:11px;color:var(--gray-l);border:1px solid var(--line);border-radius:999px;padding:2px 10px;background:#fff;white-space:nowrap}
.hero-cell-body{padding:10px}
.hero-cell .cw-root{max-width:none}
.hero-cell .cw-stage{border-radius:10px}
.hero-cell .cw-btn{min-height:38px;padding:0 13px;font-size:12.5px}
.hero-cell .cw-hint{width:100%;margin-left:0}

/* ---------- 三维结构实验室 ---------- */
#lab .lab-grid{display:grid;grid-template-columns:1fr 300px;gap:20px;align-items:start}
#lab .lab-main{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}
#lab .lab-main .cw-root{max-width:none}
#lab .lab-side{display:flex;flex-direction:column;gap:16px}
#lab .lab-h{font-size:15px;color:var(--blue-d);margin-bottom:10px}
#lab .lab-links{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}
@media(max-width:980px){#lab .lab-grid{grid-template-columns:1fr}}