:root{--ink:#253735;--muted:#697673;--accent:#216b60;--accent-light:#e3efeb;--paper:#fff;--bg:#f6f7f3;--line:#dde3dd;--danger:#b3403a;font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:16px}*{box-sizing:border-box}body{margin:0}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,.button{cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 17px;border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink);text-decoration:none;transition:background .15s,box-shadow .15s}button:hover,.button:hover{background:var(--accent-light);text-decoration:none;box-shadow:0 2px 7px #263e3714}.primary{background:var(--accent);color:white;border-color:var(--accent)}.primary:hover{background:#19584f;color:white}.danger{color:var(--danger)}button:disabled,.disabled{cursor:default;opacity:.5;box-shadow:none}input,textarea,select{width:100%;padding:11px;border:1px solid #bac8bf;border-radius:7px;background:white;color:var(--ink)}textarea{min-height:105px;resize:vertical}input[type=checkbox]{width:18px;height:18px;flex-shrink:0}label{display:flex;flex-direction:column;gap:7px;margin-bottom:18px}.check{flex-direction:row;align-items:flex-start;font-size:14px;line-height:1.6}input:focus,textarea:focus,select:focus{outline:2px solid #8fbdb0;outline-offset:2px}h1{font-size:32px;letter-spacing:-.7px;margin:0 0 15px}h2{font-size:22px;margin:0 0 15px}h3{font-size:18px;margin:0 0 10px}p{line-height:1.8}small,.muted{color:var(--muted)}.eyebrow{color:var(--accent);font-size:13px;letter-spacing:2px;margin-bottom:15px}.header-inner{max-width:1240px;margin:auto;display:flex;align-items:center;gap:30px;min-height:76px;padding:16px 24px}.brand{font-weight:800;font-size:23px;white-space:nowrap;color:var(--ink)}#site-header{background:#fff;border-bottom:1px solid var(--line)}.header-nav{display:flex;align-items:center;gap:24px;flex:1}.header-nav a{color:var(--ink);white-space:nowrap}.account-nav{display:flex;gap:12px;align-items:center}.account-menu{position:relative}.account-menu summary{cursor:pointer;list-style:none;font-size:14px;padding:10px;max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account-menu .menu{position:absolute;right:0;top:100%;background:white;box-shadow:0 8px 30px #203c3320;border:1px solid var(--line);border-radius:9px;min-width:150px;z-index:20;padding:6px}.menu a,.menu button{display:block;width:100%;text-align:left;border:0;border-radius:5px;padding:10px}.dropdown{position:relative}.dropdown summary{cursor:pointer}.dropdown .menu{position:absolute;background:white;padding:10px;min-width:160px;box-shadow:0 6px 20px #25373520;z-index:10}.container{max-width:1192px;margin:0 auto;padding:38px 24px 60px}.hero{padding:64px 48px;border-radius:18px;background:linear-gradient(115deg,#e5eeea,#eff1e5);margin-bottom:40px;position:relative;overflow:hidden}.hero h1{font-size:clamp(32px,4vw,52px);max-width:750px}.hero p{font-size:18px;max-width:660px}.hero .actions{margin-top:28px}.hero-icon{position:absolute;right:45px;bottom:22px;font-size:110px;color:#216b6010;font-weight:800;pointer-events:none}.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:var(--paper);border:1px solid var(--line);border-radius:13px;padding:25px;min-width:0}.card p{margin:10px 0 20px}.card .actions{margin-top:20px}.experiment-card{display:flex;flex-direction:column}.experiment-card h3{line-height:1.5}.experiment-card p{flex:1;font-size:14px}.badge{display:inline-block;border-radius:20px;background:var(--accent-light);color:var(--accent);font-size:12px;padding:5px 10px;margin-right:7px;margin-bottom:12px}.badge.gray{background:#f1f2ed;color:#68736b}.section{margin-bottom:35px}.section-head{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-bottom:18px}.filter{display:flex;gap:12px;align-items:center;padding:18px;background:white;border:1px solid var(--line);border-radius:10px;margin:20px 0}.filter input{flex:1;min-width:120px}.filter select{width:135px}.breadcrumbs{font-size:13px;margin-bottom:24px;color:var(--muted)}.intro-grid{display:grid;grid-template-columns:1fr 300px;gap:26px}.intro-list{line-height:1.95;padding-left:23px}.sticky{position:sticky;top:24px;align-self:start}.auth-card{max-width:475px;margin:44px auto;padding:32px}.auth-card h1{font-size:28px}.auth-links{display:flex;justify-content:space-between;gap:12px;font-size:14px;margin-top:24px}.empty{padding:38px 24px;text-align:center;background:#fff;border:1px dashed #c8d5ce;border-radius:12px}.empty p{color:var(--muted)}.status{border-radius:8px;padding:12px 16px;background:#eef3ed;color:var(--ink);margin:14px 0;font-size:14px;line-height:1.7}.status.error{background:#fff0ec;color:var(--danger)}#notice{position:fixed;top:88px;right:24px;z-index:100;max-width:min(460px,calc(100% - 32px));box-shadow:0 3px 15px #263e3718}#notice:empty{display:none}.user-frame{display:grid;grid-template-columns:225px minmax(0,1fr);gap:25px}.sidebar{background:white;border:1px solid var(--line);border-radius:12px;padding:15px;align-self:start}.sidebar a{display:block;color:var(--ink);padding:12px;border-radius:7px;margin-bottom:5px}.sidebar a.active{background:var(--accent-light);font-weight:600}.sidebar .membership-box{border-top:1px solid var(--line);margin-top:16px;padding:18px 8px 0;font-size:13px}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:white}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:15px;border-bottom:1px solid var(--line);vertical-align:top}th{background:#f2f5ef;white-space:nowrap}td .actions{gap:6px}td button,td .button{font-size:12px;min-height:32px;padding:5px 9px}.pagination{display:flex;justify-content:flex-end;align-items:center;gap:12px;margin:18px 0}.price{font-size:42px;font-weight:750;margin:18px 0}.policy{white-space:pre-wrap;line-height:1.9;overflow-wrap:anywhere}.help-item{border-bottom:1px solid var(--line);padding:17px 0}.help-item summary{cursor:pointer;font-weight:600}#site-footer{border-top:1px solid var(--line);padding:28px 24px;text-align:center;background:white;color:var(--muted);font-size:13px;line-height:2}.footer-links{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}.admin-site{background:#f3f5f7}.admin-site #site-header{background:#253735;color:white}.admin-site .brand,.admin-site .header-inner a{color:white}.admin-site .header-inner{max-width:none}.admin-frame{display:grid;grid-template-columns:210px minmax(0,1fr);min-height:calc(100vh - 76px)}#admin-nav{background:white;border-right:1px solid var(--line);padding:25px 15px}#admin-nav a{display:block;padding:13px 15px;margin-bottom:5px;border-radius:7px;color:var(--ink)}#admin-nav a.active{background:var(--accent-light);font-weight:700}.admin-frame main{padding:32px;min-width:0}.metrics{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-bottom:28px}.metric strong{display:block;font-size:29px;margin-top:13px}.edit-form{max-width:850px}.edit-form .grid{gap:18px}.details{display:grid;grid-template-columns:140px minmax(0,1fr);gap:15px;line-height:1.6}.details dt{color:var(--muted)}.details dd{margin:0;overflow-wrap:anywhere}.loading{padding:35px;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:13px;padding:28px;width:min(500px,calc(100vw - 30px));color:var(--ink)}dialog::backdrop{background:#233c3655}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:950px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.metrics{grid-template-columns:repeat(3,1fr)}.header-inner{gap:18px}.header-nav{gap:14px}.user-frame{grid-template-columns:180px 1fr}}@media(max-width:650px){.header-inner{flex-wrap:wrap;padding:14px 18px;gap:12px}.brand{font-size:21px}.header-nav{order:3;flex-basis:100%;gap:22px;font-size:14px}.account-nav{margin-left:auto}.container{padding:25px 16px 40px}.hero{padding:35px 24px}.hero p{font-size:16px}.hero-icon{display:none}.grid,.grid.two,.intro-grid,.user-frame{grid-template-columns:1fr}.sticky{position:static}.filter{flex-wrap:wrap}.filter input{flex-basis:100%}.filter select{flex:1}.sidebar{display:flex;flex-wrap:wrap;padding:10px}.sidebar a{font-size:13px;padding:10px;margin:0}.sidebar .membership-box{width:100%;margin-top:10px;padding-top:10px}.auth-card{margin:10px auto;padding:25px}.admin-frame{grid-template-columns:1fr}#admin-nav{display:flex;overflow:auto;padding:10px}#admin-nav a{white-space:nowrap;margin:0;padding:10px}.admin-frame main{padding:23px 15px}.metrics{grid-template-columns:repeat(2,1fr)}.details{grid-template-columns:100px 1fr}.footer-links{gap:13px}.edit-form .grid{grid-template-columns:1fr}}

.experiment-cover{display:block;width:100%;height:110px;object-fit:cover;border-radius:8px;margin-bottom:20px}

@media(max-width:700px){.desktop-payment{display:none}}

.user-frame>*,.grid>*{min-width:0}.table-wrap{max-width:100%;overflow-x:auto}.card p{overflow-wrap:anywhere}


/* Homepage styling for the laboratory list. */
body.labs-page {
  --bg:#f5f6f8; --surface:#ffffff; --surface-2:#fafbfc;
  --line:#e5e7eb; --line-2:#d1d5db;
  --text:#1b1d21; --text-2:#5c6370; --text-3:#9aa1ad;
  --brand:#2f6bff; --brand-2:#1f52d6; --brand-soft:#eef3ff;
  --ok:#159a5b; --ok-soft:#e8f7ef;
  --warn:#c2760a; --warn-soft:#fdf3e3;
  --danger:#d33b3b; --danger-soft:#fdeced;
  --purple:#7c4dd6; --purple-soft:#f2ecfd;
  --r:8px; --r-lg:12px;
  --sh:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 4px 16px rgba(16,24,40,.08);
--ink:#1b1d21;--muted:#5c6370;--accent:#3867ed;--accent-light:#eef3ff;--paper:#fff;--bg:#f5f7fc;font-size:14px;line-height:1.6;}
body.labs-page .topbar{min-height:64px;background:var(--surface);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:clamp(10px,1.6vw,26px);padding:10px clamp(14px,2.2vw,28px);position:sticky;top:0;z-index:60;flex-wrap:wrap}
body.labs-page .logo{display:flex;align-items:center;gap:10px;cursor:pointer;flex-shrink:0}
body.labs-page .logo-mark{width:34px;height:34px;border-radius:9px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:17px;font-weight:700}
body.labs-page .logo-tx{display:flex;flex-direction:column;line-height:1.3}
body.labs-page .logo-tx b{font-size:17px;font-weight:700;letter-spacing:-.2px}
body.labs-page .logo-tx span{font-size:11px;color:var(--text-3);font-weight:400}
body.labs-page .nav{display:flex;gap:clamp(2px,.5vw,6px);flex:1;flex-wrap:wrap;min-width:0}
body.labs-page .nav a{padding:8px clamp(8px,1.1vw,14px);white-space:nowrap;border-radius:var(--r);color:var(--text-2);cursor:pointer;font-size:14px}
body.labs-page .nav a:hover{background:var(--bg);color:var(--text)}
body.labs-page .nav a.on{background:var(--brand-soft);color:var(--brand-2);font-weight:500}
body.labs-page .searchbox{position:relative;flex:0 1 auto;min-width:0}
body.labs-page .searchbox input{width:clamp(130px,20vw,240px);min-width:0;height:34px;border:1px solid var(--line);border-radius:var(--r);padding:0 12px 0 32px;background:var(--surface-2);transition:.15s}
body.labs-page .searchbox input:focus{border-color:var(--brand);background:#fff;width:clamp(160px,24vw,280px)}
body.labs-page .searchbox::before{content:"";position:absolute;left:11px;top:9px;width:14px;height:14px;border:2px solid var(--text-3);border-radius:50%}
body.labs-page .searchbox::after{content:"";position:absolute;left:23px;top:21px;width:6px;height:2px;background:var(--text-3);transform:rotate(45deg)}
body.labs-page .who{display:flex;align-items:center;gap:10px;flex-shrink:0}
body.labs-page .topbar{height:64px;border-bottom:1px solid rgba(230,233,240,.7);box-shadow:0 2px 12px -6px rgba(24,33,60,.08)}
body.labs-page .logo-mark{border-radius:9px;background:linear-gradient(135deg,#5b8cff,#2f62e8);box-shadow:0 4px 10px -2px rgba(47,107,255,.45)}
body.labs-page .who .header-action { display:inline-flex; align-items:center; justify-content:center; height:38px; padding:0 18px; border-radius:8px; font-size:14px; font-weight:600; white-space:nowrap; text-decoration:none; cursor:pointer; transition:background .15s,border-color .15s; }
body.labs-page .who .header-account { gap:7px; }
body.labs-page .who .header-login { background:#fff; border:1px solid #cbd5e1; color:#334155; }
body.labs-page .who .header-login:hover { border-color:#3867ed; background:#fff; color:#334155; }
body.labs-page .who .header-membership { background:#3867ed; border:1px solid #3867ed; color:#fff; }
body.labs-page .who .header-membership:hover { background:#2855d4; border-color:#2855d4; }
body.labs-page .who .header-action:focus-visible { outline:3px solid #b5c8ff; outline-offset:3px; }
body.labs-page #site-header{position:sticky;top:0;z-index:60;border:0;}
body.labs-page .topbar{position:static;}
body.labs-page .topbar a{color:inherit;text-decoration:none;}
body.labs-page .topbar .nav a{color:var(--text-2);}
body.labs-page .topbar .nav a.on{color:var(--brand-2);}
body.labs-page .topbar .header-membership{color:#fff;}
body.labs-page .topbar input{font-size:14px;}
body.labs-page .logo{font-weight:600;line-height:1.6;}
body.labs-page .logo-tx span{display:block;}
body.labs-page .nav{order:0;width:auto;flex-basis:0;justify-content:flex-start;}
body.labs-page .container{max-width:1380px;padding:36px 28px 60px;}
body.labs-page h1{font-size:30px;}
body.labs-page .card{border-color:#e5e9f2;border-radius:16px;padding:30px;background:#fff;box-shadow:0 4px 20px #24447706;}
body.labs-page .card h2{margin-top:8px;}
body.labs-page .primary{background:#3867ed;border-color:#3867ed;border-radius:8px;min-height:40px;font-size:14px;}
body.labs-page .primary:hover{background:#2855d4;}
body.labs-page .badge.gray{background:#f2ecfd;color:#7c4dd6;}
body.labs-page #site-footer{background:#fff;border-color:#e5e9f2;}
@media(max-width:1100px){body.labs-page .searchbox{display:none;}}
@media(max-width:760px){body.labs-page .topbar{height:auto;}body.labs-page .nav{order:3;flex-basis:100%;}body.labs-page .who{margin-left:auto;}}

body.labs-page{background:#f5f7fc;color:#1b1d21;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;}

/* Resource library follows the supplied prototype layout. */
.resource-library .library-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:22px;}
.resource-library .breadcrumbs{margin-bottom:12px;}
.resource-library .library-heading h1{margin-bottom:8px;}
.resource-library .library-heading p{margin:0;}
.resource-library .library-search{display:flex;gap:10px;width:340px;}
.resource-library .library-search input{min-width:0;}
.resource-library .library-filters{padding:18px 22px;background:#fff;border:1px solid #e5e9f2;border-radius:12px;margin-bottom:22px;}
.resource-library .library-filter-row{display:flex;align-items:center;gap:26px;}
.resource-library .library-filter-row+ .library-filter-row{margin-top:12px;}
.resource-library .library-filter-row>span{font-size:13px;color:#9aa1ad;flex-shrink:0;}
.resource-library .library-filter-row>div{display:flex;flex-wrap:wrap;gap:8px;}
.resource-library .library-chip{min-height:32px;padding:4px 14px;border:1px solid transparent;background:#f7f9fc;border-radius:7px;font-size:13px;color:#5c6370;}
.resource-library button.selected{background:#eef3ff;color:#3867ed;border-color:#d3e0ff;}
.resource-library .library-body{display:flex;align-items:flex-start;gap:22px;}
.resource-library .library-chapters{width:176px;flex-shrink:0;background:#fff;border:1px solid #e5e9f2;border-radius:12px;padding:16px 10px;position:sticky;top:86px;}
.resource-library .library-chapters h2{font-size:14px;padding:0 12px;margin:0 0 12px;color:#5c6370;}
.resource-library .library-chapters button{display:block;text-align:left;width:100%;border:1px solid transparent;font-size:13px;min-height:38px;padding:8px 12px;margin-bottom:4px;}
.resource-library .library-results{flex:1;min-width:0;}
.resource-library .library-results-head{display:flex;justify-content:space-between;align-items:center;gap:12px;color:#697386;margin-bottom:14px;font-size:13px;}
.resource-library .library-sort{display:flex;background:#fff;border:1px solid #e5e9f2;border-radius:8px;padding:3px;gap:3px;}
.resource-library .library-sort button{font-size:12px;min-height:30px;padding:4px 10px;border-color:transparent;}
.resource-library .library-cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;}
.resource-library .library-card{display:flex;flex-direction:column;background:#fff;border:1px solid #e5e9f2;border-radius:12px;overflow:hidden;}
.resource-library .library-cover{display:block;position:relative;height:124px;background:#edf3ff;}
.resource-library .library-cover.mechanics{background:#f2ecfd;}
.resource-library .library-cover img{width:100%;height:100%;object-fit:cover;}
.resource-library .library-access{position:absolute;top:10px;right:10px;background:#fff9eb;color:#a87318;padding:3px 8px;font-size:11px;border-radius:6px;}
.resource-library .library-card-content{padding:14px;display:flex;flex-direction:column;flex:1;}
.resource-library .library-card h2{font-size:15px;line-height:1.55;margin:0 0 8px;}
.resource-library .library-card h2 a{color:#1b1d21;}
.resource-library .library-card p{font-size:12px;color:#7b879a;line-height:1.7;margin:0 0 12px;min-height:60px;}
.resource-library .library-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:14px;}
.resource-library .library-tags span{padding:2px 6px;background:#f3f6fc;border-radius:4px;font-size:11px;color:#64748b;}
.resource-library .library-card-footer{display:flex;justify-content:space-between;align-items:center;gap:5px;margin-top:auto;padding-top:12px;border-top:1px solid #eef1f6;font-size:11px;color:#9aa1ad;}
.resource-library .library-card-footer .button{font-size:12px;min-height:30px;padding:4px 10px;}
.resource-library .library-empty{grid-column:1/-1;background:#fff;border:1px dashed #d8e2f3;border-radius:12px;text-align:center;padding:48px 20px;}
.resource-library .library-empty h2{font-size:18px;}
@media(max-width:1200px){.resource-library .library-cards{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media(max-width:900px){.resource-library .library-cards{grid-template-columns:repeat(2,minmax(0,1fr));}.resource-library .library-chapters{width:150px;}}
@media(max-width:650px){.resource-library .library-heading{align-items:stretch;flex-direction:column;gap:16px;}.resource-library .library-search{width:100%;}.resource-library .library-body{flex-direction:column;}.resource-library .library-chapters{position:static;width:100%;display:flex;flex-wrap:wrap;gap:5px;}.resource-library .library-chapters h2{width:100%;}.resource-library .library-chapters button{width:auto;margin:0;}.resource-library .library-results{width:100%;}.resource-library .library-cards{gap:10px;}.resource-library .library-card-footer{flex-wrap:wrap;}}

.resource-library .library-search input{height:40px;padding:9px 12px;flex:1;}
.resource-library .library-search button{flex-shrink:0;white-space:nowrap;height:40px;min-height:40px;}
.resource-library .library-cover.electric img{filter:hue-rotate(70deg) saturate(1.15);}
.resource-library .library-cover.mechanics img{filter:hue-rotate(100deg);}

body.resource-library .container { padding-top:18px; }
.resource-library .library-heading { margin-bottom:14px; gap:18px; }
.resource-library .library-heading .breadcrumbs { margin-bottom:6px; line-height:1.4; }
.resource-library .library-heading h1 { font-size:26px; line-height:1.3; margin:0; }

.resource-library a.library-card{color:inherit;text-decoration:none;transition:border-color 140ms ease,box-shadow 140ms ease;}
.resource-library a.library-card:hover{border-color:#a6bff5;box-shadow:0 4px 16px #3867ed12;text-decoration:none;}
.resource-library a.library-card:focus-visible{outline:3px solid #91b0f5;outline-offset:3px;}

.experiment-preview-page .experiment-preview{position:relative;overflow:hidden;border:1px solid #e5e9f2;border-radius:14px;background:#fff;margin-bottom:24px;}
.experiment-preview-page .experiment-preview img{display:block;width:100%;height:auto;}
.experiment-preview-page .preview-label{position:absolute;top:12px;left:12px;padding:5px 10px;border-radius:6px;background:#fff;color:#3867ed;font-size:12px;box-shadow:0 2px 8px #24447712;}
.experiment-preview-page .preview-membership .button{width:100%;}
.experiment-preview-page .preview-membership h2{font-size:20px;}
.experiment-preview-page .preview-login{font-size:13px;}
.experiment-preview-page .sticky{top:88px;}

.resource-library .library-cover {height:auto;aspect-ratio:16 / 10;background:#f5f7fc;border-bottom:1px solid #e5e9f2;overflow:hidden;}
.resource-library .library-cover img {object-fit:cover;object-position:center;filter:none!important;}
.resource-library .library-card h2 {font-size:16px;line-height:1.5;margin:0 0 9px;}
.resource-library .library-subject {align-self:flex-start;background:#eef3ff;color:#3867ed;font-size:12px;font-weight:600;border-radius:5px;padding:3px 9px;margin-bottom:10px;}
.resource-library .library-subject.mechanics {background:#f2ecfd;color:#7c4dd6;}
.resource-library .library-card p {font-size:13px;line-height:1.7;margin-bottom:16px;min-height:44px;}
.resource-library .library-card-footer {justify-content:flex-end;padding-top:0;border-top:0;}
.resource-library .library-card-footer .button {min-height:34px;font-size:13px;padding:5px 14px;}

.admin-cover-preview{display:block;width:min(360px,100%);aspect-ratio:16 / 10;object-fit:cover;border:1px solid #e5e9f2;border-radius:10px;margin-bottom:18px;}
.admin-resource-card-preview{max-width:360px;}
.required-mark{display:inline;color:#dc2626;font-weight:600;}
.field-caption{display:block;}
.resource-library .library-chapters button[hidden]{display:none!important}