:root{
  --bg:#f4f7fb;
  --card:#ffffff;
  --ink:#1e2a38;
  --ink2:#5a6b7d;
  --line:#e2e9f2;
  --brand:#2f7de1;
  --brand2:#1fb6a6;
  --warn:#f0a020;
  --danger:#e4572e;
  --ok:#2fa84f;
  --shadow:0 6px 22px rgba(31,60,110,.08);
  --r:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  font-size:15px;line-height:1.6;
  padding-bottom:40px;
}
h1,h2,h3{margin:0}
button{font-family:inherit}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:20;
  background:linear-gradient(120deg,#2f7de1,#1fb6a6);
  color:#fff;padding:12px 18px;
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  box-shadow:0 4px 16px rgba(47,125,225,.25);
}
.brand{display:flex;align-items:center;gap:10px;cursor:pointer}
.brand .logo{font-size:28px}
.brand h1{font-size:19px;letter-spacing:.5px}
.brand p{margin:0;font-size:12px;opacity:.85}
.unit-nav{display:flex;gap:8px;flex-wrap:wrap;margin-left:auto}
.unit-nav button{
  background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);
  color:#fff;padding:7px 14px;border-radius:999px;cursor:pointer;font-size:14px;
  transition:.15s;
}
.unit-nav button:hover{background:rgba(255,255,255,.3)}
.unit-nav button.on{background:#fff;color:var(--brand);font-weight:700}

/* ---------- 视图 ---------- */
main{max-width:1240px;margin:0 auto;padding:18px}
.view{display:none}
.view.active{display:block}

.unit-head{
  background:var(--card);border-radius:var(--r);padding:16px 20px;
  box-shadow:var(--shadow);margin-bottom:16px;border-left:6px solid var(--brand);
}
.unit-head h2{font-size:20px}
.unit-head p{margin:6px 0 0;color:var(--ink2);font-size:14px}

.exp-grid{
  display:grid;gap:14px;
  grid-template-columns:repeat(auto-fill,minmax(250px,1fr));
}
.exp-card{
  background:var(--card);border-radius:var(--r);padding:16px;box-shadow:var(--shadow);
  cursor:pointer;transition:.18s;border:2px solid transparent;position:relative;
  display:flex;gap:12px;align-items:flex-start;
}
.exp-card:hover{transform:translateY(-3px);border-color:var(--brand)}
.exp-card .ic{font-size:26px;line-height:1}
.exp-card h4{margin:0 0 4px;font-size:16px}
.exp-card p{margin:0;font-size:13px;color:var(--ink2)}
.exp-card .no{
  position:absolute;right:12px;top:10px;font-size:12px;color:#b6c2d1;font-weight:700;
}

/* ---------- 实验台 ---------- */
.lab-top{display:flex;align-items:center;gap:14px;margin-bottom:14px;flex-wrap:wrap}
.lab-title h2{font-size:21px}
.lab-title p{margin:3px 0 0;font-size:13.5px;color:var(--ink2);max-width:760px}
.lab-body{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:16px;align-items:start}

.stage{
  background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);
  padding:16px;min-height:420px;
}
.side{display:flex;flex-direction:column;gap:12px;position:sticky;top:84px}
.panel{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:14px}
.panel h3{font-size:15px;margin-bottom:10px;display:flex;align-items:center;gap:6px}
.side-btns{display:flex;gap:8px}
.side-btns .btn{flex:1}

/* 通用控件 */
.btn{
  background:var(--brand);color:#fff;border:none;padding:8px 14px;border-radius:10px;
  cursor:pointer;font-size:14px;transition:.15s;
}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:#eef4fc;color:var(--brand)}
.btn.small{padding:5px 10px;font-size:13px}
.btn.back{background:#fff;color:var(--brand);box-shadow:var(--shadow)}

.ctl{margin-bottom:12px}
.ctl-label{display:flex;justify-content:space-between;font-size:13.5px;margin-bottom:4px}
.ctl-label b{color:var(--brand);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--brand);height:22px}

.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg button{
  border:1px solid var(--line);background:#fff;color:var(--ink2);
  padding:6px 12px;border-radius:999px;cursor:pointer;font-size:13.5px;
}
.seg button.on{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}

.ctl-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:10px}
.ctl-row .btn{white-space:nowrap}

.readout{
  display:flex;gap:14px;flex-wrap:wrap;background:#f7fafe;border:1px dashed var(--line);
  border-radius:12px;padding:10px 12px;margin:10px 0;
}
.readout div{font-size:13.5px}
.readout b{font-size:17px;color:var(--brand);font-variant-numeric:tabular-nums}
.readout .warnv b{color:var(--danger)}

/* 记录表 */
table.rec{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}
table.rec th,table.rec td{border:1px solid var(--line);padding:5px 6px;text-align:center}
table.rec th{background:#eef4fc;font-weight:600;color:var(--ink)}
table.rec td{border-top:none}
table.rec tbody tr:first-child td{border-top:1px solid var(--line)}
.empty{color:#a3b1c2;font-size:13px;text-align:center;padding:14px 0}

.hint{font-size:13.5px;color:var(--ink2);min-height:24px}
.hint b{color:var(--brand)}
#concludeArea{font-size:13.5px}
#concludeArea li{margin-bottom:5px}

.tag{display:inline-block;background:#eef4fc;color:var(--brand);border-radius:6px;padding:1px 7px;font-size:12px;margin-right:4px}
.ok{color:var(--ok);font-weight:600}
.bad{color:var(--danger);font-weight:600}

svg{display:block;max-width:100%;touch-action:none;user-select:none}
svg text{font-family:inherit;user-select:none}

/* 提示条 */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(20px);
  background:rgba(30,42,56,.92);color:#fff;padding:9px 18px;border-radius:999px;
  font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:60;
}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(20,30,45,.5);z-index:70;display:none;align-items:center;justify-content:center;padding:20px}
.modal:not([hidden]){display:flex}
.modal-box{background:#fff;border-radius:var(--r);padding:20px;max-width:620px;width:100%;max-height:80vh;overflow:auto}
.modal-box h3{margin-bottom:10px}
.modal-box pre{white-space:pre-wrap;background:#f7f9fc;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:13px;font-family:inherit;line-height:1.7}
.modal-btns{display:flex;gap:10px;justify-content:flex-end;margin-top:14px}

/* ---------- 登录 / 用户区 ---------- */
.userbox{display:flex;align-items:center;gap:8px;margin-left:auto;font-size:13px}
.userbox .uname{background:rgba(255,255,255,.2);padding:4px 10px;border-radius:999px}
.userbox .lbtn{background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);
  color:#fff;padding:4px 10px;border-radius:8px;cursor:pointer;font-size:12.5px}
.userbox .lbtn:hover{background:rgba(255,255,255,.32)}
.sync{width:9px;height:9px;border-radius:50%;background:#9aa8b8;flex:none}
.sync.on{background:#7ee0a0;box-shadow:0 0 0 3px rgba(126,224,160,.25)}
.sync.saving{background:#ffd166;animation:pulse 1s infinite}
.sync.off{background:#ff8a80}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

.auth-gate{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;
  padding:20px;background:linear-gradient(140deg,#1d3b6b,#125c63)}
.auth-gate:not([hidden]){display:flex}
.auth-box{background:#fff;border-radius:20px;padding:28px 26px;width:100%;max-width:380px;
  box-shadow:0 20px 60px rgba(0,0,0,.3)}
.auth-logo{font-size:42px;text-align:center;margin-bottom:6px}
.auth-box h2{text-align:center;font-size:22px;margin-bottom:6px}
.auth-box>p{margin:0 0 18px;font-size:13px;color:var(--ink2);text-align:center;line-height:1.6}
.auth-box input{width:100%;padding:13px 14px;margin-bottom:10px;font-size:15.5px;font-family:inherit;
  border:2px solid var(--line);border-radius:12px;outline:none;transition:.15s}
.auth-box input:focus{border-color:var(--brand)}
.auth-err{min-height:20px;color:var(--danger);font-size:13px;text-align:center;margin-bottom:6px}
.auth-go{width:100%;padding:13px;font-size:16px;font-weight:600;border-radius:12px}
.auth-foot{margin-top:14px;font-size:12.5px;color:var(--ink2);text-align:center;line-height:1.7}
.auth-foot b{color:var(--brand);cursor:pointer}
.auth-tip{background:#f7f9fc;border:1px dashed var(--line);border-radius:10px;padding:10px 12px;
  font-size:12.5px;color:var(--ink2);margin-top:12px;text-align:left;line-height:1.7}

@media (max-width:900px){
  .lab-body{grid-template-columns:1fr}
  .side{position:static}
  .unit-nav{margin-left:0;width:100%}
  .brand h1{font-size:17px}
  .userbox{width:100%;margin-left:0;justify-content:flex-end}
}