:root{
  --bg:#EDF0F6; --card:#FFFFFF; --ink:#111827; --muted:#596273; --line:#E4E8EF;
  --accent:#3651F0; --accent-soft:#E9EDFF; --warn:#D6402A; --warn-soft:#FDE7E3;
  --star:#FFB020; --night:#111827; --radius:20px;
}
*{box-sizing:border-box}
html,body{margin:0;background-color:var(--bg);color:var(--ink);font-family:'Nunito Sans',system-ui,sans-serif;font-size:15px;line-height:1.45}
h1,h2,.serif{font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;color:var(--accent)}
button,input,select,textarea{font:inherit;color:inherit}
.app{max-width:520px;margin:0 auto;min-height:100vh;padding:0 16px 96px}
header.top{padding:20px 0 8px;display:flex;align-items:flex-end;justify-content:space-between;gap:12px}
header.top h1{font-size:30px;margin:2px 0 0;letter-spacing:-.01em;font-weight:700}
.brand{display:inline-flex;align-items:center;gap:9px;font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-weight:700;font-size:24px;letter-spacing:-.01em;color:var(--accent);margin-bottom:6px}
header.top .sub{color:var(--muted);font-size:13px}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:3px 9px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-weight:600}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin:12px 0}
.card h2{font-size:15px;margin:0 0 8px;font-weight:700}
.card h3{font-size:13px;margin:12px 0 6px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-weight:600}
.muted{color:var(--muted)}
.small{font-size:13px}
.btn{border:0;border-radius:10px;padding:10px 14px;font-weight:600;cursor:pointer;background:var(--accent);color:#fff}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn.quiet{background:#EEF1F6;color:var(--ink)}
.btn.block{width:100%}
.btn:disabled{opacity:.5;cursor:default}
.row{display:flex;gap:8px;align-items:center}
.row.wrap{flex-wrap:wrap}
.grow{flex:1}
input[type=text],input[type=email],input[type=date],input[type=number],input[type=url],select,textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px 10px;background:#fff}
textarea{min-height:140px;resize:vertical}
label.f{display:block;font-size:12px;color:var(--muted);margin:8px 0 4px;font-weight:600}
.item{display:flex;gap:10px;align-items:flex-start;padding:10px 0;border-top:1px solid var(--line)}
.item:first-child{border-top:0}
.dot{width:10px;height:10px;border-radius:50%;flex:none;margin-top:6px}
.item .t{font-weight:600}
.item .m{font-size:12.5px;color:var(--muted)}
.item.done .t{text-decoration:line-through;color:var(--muted)}
.chk{width:22px;height:22px;border-radius:7px;border:1.5px solid var(--line);background:#fff;flex:none;cursor:pointer;display:grid;place-items:center;margin-top:1px}
.chk.on{background:var(--accent);border-color:var(--accent);color:#fff}
.tag{font-size:11px;font-weight:700;padding:2px 7px;border-radius:6px;background:#EEF1F6;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
.tag.exam{background:#FDE7E3;color:#B42318}
.tag.paper,.tag.project{background:#E3ECFF;color:#1F4FB8}
.tag.quiz{background:#FFF1CC;color:#8A5A00}
.tag.milestone{background:var(--accent-soft);color:var(--accent)}
.due-soon{color:var(--warn);font-weight:600}
nav.tabs{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);display:flex;justify-content:center;padding-bottom:env(safe-area-inset-bottom)}
nav.tabs .in{display:flex;max-width:520px;width:100%}
nav.tabs button{flex:1;border:0;background:none;padding:10px 0 12px;font-size:12px;font-weight:600;color:var(--muted);cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:3px}
nav.tabs button.on{color:var(--accent)}
nav.tabs svg{width:22px;height:22px}
.heat{display:flex;gap:4px;align-items:flex-end;height:70px;margin-top:6px}
.heat .b{flex:1;border-radius:4px 4px 2px 2px;background:var(--accent);min-height:3px;position:relative}
.heat .b.hot{background:var(--warn)}
.heatlbl{display:flex;gap:4px;font-size:10px;color:var(--muted);margin-top:4px}
.heatlbl span{flex:1;text-align:center}
.empty{text-align:center;padding:28px 12px}
.empty .big{font-size:17px;font-weight:700;margin-bottom:6px}
.steps{text-align:left;margin:14px auto 0;max-width:320px;padding-left:20px;color:var(--muted)}
.steps li{margin:4px 0}
.overlay{position:fixed;inset:0;background:rgba(20,22,25,.45);display:none;align-items:flex-end;justify-content:center;z-index:20}
.overlay.on{display:flex}
.sheet{background:var(--bg);width:100%;max-width:560px;max-height:92vh;overflow:auto;border-radius:18px 18px 0 0;padding:18px 16px 28px}
.sheet h2{margin:0 0 4px;font-size:18px}
.rv{display:grid;grid-template-columns:24px 1fr;gap:8px;padding:10px 0;border-top:1px solid var(--line)}
.rv .fields{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.rv .fields input[type=text]{grid-column:1/-1}
.swatches{display:flex;gap:8px;flex-wrap:wrap}
.sw{width:28px;height:28px;border-radius:50%;border:2px solid transparent;cursor:pointer}
.sw.on{border-color:var(--ink)}
.spinner{display:inline-block;width:14px;height:14px;border:2px solid #fff6;border-top-color:#fff;border-radius:50%;animation:sp 1s linear infinite;vertical-align:-2px;margin-right:6px}
/* ---- Due North look ---- */
.card{box-shadow:0 1px 0 var(--line)}
.card h2{font-size:19px;font-weight:700}
.btn{border-radius:14px;font-weight:800;min-height:44px}
.btn.ghost{border-width:2px}
.btn.quiet{background:#EEF1F6}
.pill{background:var(--accent-soft);color:var(--accent);font-weight:800}
.item{border-top:1px dashed var(--line)}
.chk{border:2px solid #C3CAD6;border-radius:9px;background:var(--card)}
.tag{border-radius:999px;background:#EEF1F6;color:#4B5563;font-weight:800}
.tag.exam{background:#FDE7E3;color:#B42318}
.tag.paper,.tag.project{background:#E3ECFF;color:#1F4FB8}
.tag.quiz{background:#FFF1CC;color:#8A5A00}
.tag.milestone{background:var(--accent-soft);color:#2438C9}
nav.tabs{background:var(--card)}
nav.tabs button{color:var(--muted)}
nav.tabs button.on{color:var(--accent)}
nav.tabs button svg{padding:3px 10px;width:44px;height:28px;border-radius:14px}
nav.tabs button.on svg{background:var(--accent-soft)}
.heat .b{background:#C3CAD6}
.heat .b.hot{background:var(--warn)}
.progress div{background:var(--accent)}
.sheet{background-color:var(--card)}
.toast{background:var(--accent);border-radius:14px}
.night{background:var(--night);color:#FFFFFF;border-color:transparent}
.night .muted,.night .small{color:#D1D5DB}
.nightbtn{background:var(--star);color:var(--night)}
.nightghost{background:transparent;border:2px solid #D1D5DB;color:#FFFFFF}
.encourage{display:flex;gap:12px;align-items:center;background:var(--accent);color:#FFFFFF;border-radius:20px;padding:14px 16px;margin:12px 0;font-weight:600}
@keyframes sp{to{transform:rotate(360deg)}}
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 14px;border-radius:10px;font-size:13px;opacity:0;transition:opacity .2s;pointer-events:none;z-index:30;max-width:90vw}
.toast.on{opacity:1}
.course-head{display:flex;gap:10px;align-items:center}
.course-head .bar{width:6px;align-self:stretch;border-radius:3px}
.kv{display:grid;grid-template-columns:110px 1fr;gap:4px 10px;font-size:13.5px;margin-top:8px}
.kv dt{color:var(--muted)}
.kv dd{margin:0}
.datebar{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted)}
.datebar input{width:auto;padding:5px 8px;font-size:12.5px}
.notice{background:var(--warn-soft);color:#9B2C1A;border-radius:10px;padding:10px 12px;font-size:13px;margin-top:10px}
.chip{border:1.5px solid var(--c);color:var(--c);background:#fff;border-radius:999px;padding:5px 11px;font-size:12.5px;font-weight:700;cursor:pointer}
.chip.on{background:var(--c);color:#fff}
.cbar{width:4px;align-self:stretch;border-radius:2px;flex:none}
.openable{cursor:pointer}
.openable:hover .t{text-decoration:underline}
.sw.big{width:30px;height:30px}
.dhead{display:flex;gap:10px;align-items:stretch;margin-bottom:6px}
.dhead .cbar{width:6px}
.crit{display:flex;gap:10px;padding:9px 0;border-top:1px solid var(--line)}
.crit:first-of-type{border-top:0}
.pts{font-size:12px;font-weight:700;color:var(--muted);white-space:nowrap}
.req li{margin:3px 0}
.osec{padding:8px 0;border-top:1px solid var(--line)}
.osec:first-of-type{border-top:0}
.osec ul{margin:4px 0 0;padding-left:18px;color:var(--muted);font-size:13.5px}
.stp{display:flex;gap:8px;align-items:center;padding:7px 0;border-top:1px solid var(--line)}
.stp:first-of-type{border-top:0}
.stp input[type=date]{width:140px;padding:5px 7px;font-size:13px}
.x{border:0;background:none;color:var(--muted);font-size:18px;cursor:pointer;padding:0 4px}
.progress{height:6px;background:#EEF1F6;border-radius:3px;overflow:hidden;margin:6px 0 2px}
.progress div{height:100%;background:var(--accent)}
.mtabs{display:flex;gap:6px;margin:10px 0}
.mtabs button{flex:1;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 0;font-weight:600;font-size:13px;cursor:pointer;color:var(--muted)}
.mtabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.mat{display:flex;gap:10px;align-items:flex-start;padding:10px 0;border-top:1px solid var(--line)}
.mat:first-child{border-top:0}
.ficon{width:36px;height:36px;border-radius:9px;display:grid;place-items:center;font-size:10.5px;font-weight:800;flex:none;color:#fff}
.preview{white-space:pre-wrap;font-size:13px;background:#F7F8FB;border:1px solid var(--line);border-radius:10px;padding:10px;max-height:260px;overflow:auto;margin-top:6px}
.daygrp{font-size:12.5px;font-weight:700;color:var(--muted);margin:14px 0 2px;text-transform:uppercase;letter-spacing:.04em}
.confirm-wrap{position:fixed;inset:0;background:rgba(20,22,25,.5);display:flex;align-items:center;justify-content:center;padding:20px;z-index:50}
.confirm-box{background:var(--card);border-radius:20px;padding:20px;max-width:360px;width:100%;box-shadow:0 10px 30px rgba(0,0,0,.25)}

/* ---- v2 layout ---- */
.hero{background:var(--night);color:#FFFFFF;border-color:transparent;padding:16px 18px}
.hero-k{font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#D1D5DB}
.hero-t{font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-size:24px;font-weight:600;margin-top:8px;line-height:1.2}
.hero-m{font-size:13.5px;color:#D1D5DB;margin-top:3px}
.linkbtn{border:0;background:none;color:var(--accent);font-weight:800;font-size:13.5px;cursor:pointer;padding:6px 0;text-decoration:underline;text-underline-offset:3px}
.seg{display:flex;gap:4px;padding:4px;background:#E2E7F0;border-radius:14px;margin:12px 0;overflow-x:auto;scrollbar-width:none}
.seg button{flex:1 0 auto;border:0;border-radius:11px;padding:8px 12px;min-height:38px;font-weight:800;font-size:13px;background:transparent;color:var(--muted);cursor:pointer}
.seg button.on{background:var(--card);color:var(--accent);box-shadow:0 1px 2px rgba(42,36,32,.12)}
.calgrid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:2px;text-align:center}
.calhead span{font-size:11px;font-weight:800;color:var(--muted);padding-bottom:4px}
.calday{border:0;background:transparent;border-radius:12px;min-height:46px;padding:6px 0 4px;display:flex;flex-direction:column;align-items:center;gap:4px;font-weight:600;font-size:14px;cursor:pointer;color:var(--ink)}
.calday.tod{background:var(--accent-soft);font-weight:800}
.calday.sel{background:var(--accent);color:#FFFFFF;font-weight:800}
.calday .dots{display:flex;gap:3px;height:6px}.calday .dots i{width:6px;height:6px;border-radius:50%}
.iconbtn{border:0;background:#EEF1F6;border-radius:12px;width:40px;height:40px;font-size:22px;font-weight:800;color:var(--accent);cursor:pointer}
.stats{display:flex;gap:8px;margin-bottom:4px}.stats div{flex:1;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:10px;text-align:center}
.stats b{display:block;font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-size:22px;color:var(--accent)}.stats span{font-size:11.5px;color:var(--muted);font-weight:700}
.bars{display:inline-flex;gap:2px;flex:none}.bars i{width:9px;height:5px;border-radius:3px}
.classcard{display:flex;gap:12px;align-items:stretch;width:100%;text-align:left;cursor:pointer;font:inherit;color:inherit}
.classcard .bar{width:7px;border-radius:4px;flex:none}.classcard .grow{display:flex;flex-direction:column;gap:2px}
.cc-t{font-size:20px;font-weight:700;color:var(--accent)}.cc-n{font-weight:700}.cc-g{font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-size:22px;font-weight:700;align-self:center}
.nextring{display:flex;gap:12px;align-items:center;background:var(--accent-soft);border-radius:18px;padding:12px 14px;margin:0 0 12px}
.ring{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;flex:none}.ring span{width:38px;height:38px;border-radius:50%;background:var(--accent-soft);display:grid;place-items:center;font-weight:800;font-size:13px;color:#7A3A1F}
details.card summary{list-style-position:inside}
.side-classes{display:none}
@media (min-width:1000px){
  .app{max-width:760px;margin-left:max(260px,calc((100vw - 760px)/2 + 120px));padding-bottom:40px}
  nav.tabs{top:0;bottom:0;right:auto;width:236px;border-top:0;border-right:1px solid var(--line);flex-direction:column;justify-content:flex-start;padding:84px 12px 20px}
  nav.tabs .in{flex-direction:column;gap:2px}
  nav.tabs button{flex-direction:row;justify-content:flex-start;gap:10px;font-size:14.5px;padding:8px 10px;border-radius:12px;flex:none}
  nav.tabs button.on{background:var(--accent-soft)}
  nav.tabs button svg,nav.tabs button.on svg{padding:0;width:22px;height:22px;background:none}
  .side-classes{display:flex;flex-direction:column;gap:2px;margin-top:18px}
  .side-h{font-size:11.5px;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin:0 10px 6px}
  .side-class{display:flex;align-items:center;gap:10px;border:0;background:transparent;border-radius:10px;padding:8px 10px;font-weight:700;font-size:14px;cursor:pointer;text-align:left;color:var(--ink)}
  .side-class span{width:10px;height:10px;border-radius:50%;flex:none}.side-class.on{background:#E2E7F0}
  .overlay{background:transparent;pointer-events:none;justify-content:flex-end;align-items:stretch}
  .overlay .sheet{pointer-events:auto;max-width:520px;max-height:none;height:100vh;border-radius:0;border-left:1px solid var(--line);box-shadow:-10px 0 30px rgba(42,36,32,.12)}
  .toast{bottom:24px}
}

.encourage{background:var(--accent-soft);color:var(--accent)}
@media (min-width:1300px){body.panel-open .app{margin-left:260px;max-width:calc(100vw - 260px - 700px)}}
.guide{border-color:#D6DEFF}
.stepcard .stp{padding:7px 0}
.nextstp{background:var(--accent-soft);border-radius:10px;margin:0 -8px;padding:7px 8px!important}
.hero-after{margin-top:10px;font-size:13px;color:#9CA3AF;display:grid;gap:3px}

.fab{position:fixed;right:18px;bottom:96px;width:58px;height:58px;border-radius:50%;border:0;background:var(--accent);color:#FFFFFF;box-shadow:0 6px 18px rgba(17,24,39,.35);display:grid;place-items:center;cursor:pointer;z-index:15}
.fabgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:12px}
.fabopt{display:flex;flex-direction:column;gap:2px;text-align:left;border:1px solid var(--line);background:var(--card);border-radius:16px;padding:12px;cursor:pointer;min-height:72px}
.fabopt b{font-size:15px;color:var(--accent)}.fabopt span{font-size:12.5px;color:var(--muted)}
@media (min-width:1000px){.fab{bottom:28px;right:28px}}

/* sign-in gate */
.gate{position:fixed;inset:0;z-index:1000;background:var(--bg,#EDF0F6);overflow:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px 18px}
.gate-card{width:100%;max-width:400px;background:var(--card,#FFFFFF);border:1px solid var(--line,#E4E8EF);border-radius:22px;padding:28px 24px;box-shadow:0 10px 30px rgba(17,24,39,.08)}
.gate-star{display:flex;justify-content:center}
.gate-brand{text-align:center;font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-weight:700;font-size:20px;color:var(--ink,#111827);margin:4px 0 18px}
.gate h1{font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-size:26px;line-height:1.15;text-align:center;margin:0 0 8px;color:var(--ink,#111827)}
.gate-sub{text-align:center;color:var(--muted,#596273);margin:0 0 18px;font-size:15px}
.gate input{margin-top:4px;padding:12px;font-size:16px}
.gate-foot{margin-top:18px;font-size:13px;color:var(--muted,#596273)}
.gate-foot a{color:inherit}
body.gated .fab,body.gated .tabs{display:none}

/* time estimates */
.estbox{margin-top:12px;padding:12px;border-radius:12px;background:#F3F5FA;border:1px solid var(--line)}
.estedit summary{cursor:pointer;font-size:13px;font-weight:700;color:var(--ink);margin-top:6px}
.estchip{white-space:nowrap}
.stepmin{display:inline-block;margin-left:8px;font-size:12px;color:var(--muted);white-space:nowrap}

.optrow{display:flex;gap:12px;align-items:center;padding:8px 0;cursor:pointer}
.optrow input[type=checkbox]{width:22px;height:22px;flex:none;accent-color:#111827}
input[type=tel]{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px 10px;background:#fff}
.estright{flex:none;align-self:center;margin-left:4px;font-size:13px;font-weight:800;color:var(--ink);background:#F3F5FA;border:1px solid var(--line);border-radius:999px;padding:4px 10px;white-space:nowrap;text-align:center;line-height:1.1}
.estright small{display:block;font-size:10px;font-weight:700;color:var(--muted)}

/* Due North Plus */
.demoband{display:flex;gap:12px;align-items:center;background:#EEF2FF;border-color:#D6DEFF}
.perks{margin:6px 0 14px;padding-left:20px;font-size:14px;line-height:1.6}
.plangrid{display:grid;gap:10px}
.plancard{position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;width:100%;padding:14px 16px;border-radius:14px;border:1.5px solid var(--line);background:#fff;cursor:pointer;font:inherit;color:inherit}
.plancard b{font-size:16px}.plancard .planprice{font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-size:20px;font-weight:700}
.plancard.best{border-color:#111827;box-shadow:0 0 0 2px rgba(17,24,39,.12)}
.planbadge{position:absolute;top:12px;right:12px;font-size:11px;font-weight:800;background:#FFB020;color:#111827;border-radius:999px;padding:3px 9px}
.plancard:hover{border-color:#111827}
.enc-quote{margin-top:8px;font-family:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif;font-style:italic;font-weight:500;font-size:15px;line-height:1.4}.enc-quote span{display:block;font-family:inherit;font-style:normal;font-size:12px;font-weight:700;opacity:.7;margin-top:2px}.enc-quote span::before{content:'— '}

/* sign-in forms */
.pwrow{display:flex;gap:8px;align-items:center}.pwrow input{flex:1}
input[type=password]{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px 10px;background:#fff}
.gate input[type=password]{padding:12px;font-size:16px}
.authlinks{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-top:14px;font-size:14px}

header.top{position:relative}
.loginbtn{position:absolute;top:2px;right:0;background:#111827;color:#fff;border:0;border-radius:999px;padding:7px 16px;font:inherit;font-weight:800;font-size:14px;cursor:pointer}
.loginbtn:hover{opacity:.9}
@media (min-width:900px){.loginbtn{top:6px}}
.outcall{display:flex;gap:12px;align-items:center;border-color:#D6DEFF;background:#F5F7FF}
.factline{margin-top:6px;font-size:14px;color:var(--ink)}
.dsettings>summary{cursor:pointer;font-weight:700;list-style:none}.dsettings>summary::-webkit-details-marker{display:none}.dsettings>summary::before{content:'▸ ';color:var(--muted)}.dsettings[open]>summary::before{content:'▾ '}
.helpbtns{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.helpbtn{flex:1 1 140px;min-height:44px;border-radius:12px;border:1.5px solid #111827;background:#fff;color:#111827;font:inherit;font-weight:800;font-size:14px;padding:8px 12px;cursor:pointer}
.helpbtn.on{background:#111827;color:#fff}
.briefwrap{background:var(--card,#FFFFFF);border:1px solid var(--line);border-radius:18px;margin-bottom:12px;overflow:hidden}
.briefwrap>.card{border:0;margin:0;border-radius:0;box-shadow:none;background:transparent}
.briefwrap>.card>h2:first-child,.briefwrap>.briefreqs>.row:first-child>h2{display:none}
.briefwrap>.briefreqs>.row:first-child{justify-content:flex-end!important}
.briefwrap[data-brief=sheet]>.briefreqs,.briefwrap[data-brief=reqs]>.briefsheet{display:none}
.brieftabs{display:flex;gap:6px;padding:10px 12px 0;border-bottom:1px solid var(--line)}
.brieftabs button{flex:1;border:0;background:transparent;font:inherit;font-weight:800;font-size:15px;color:var(--muted);padding:10px 8px 11px;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-1px}
.brieftabs button[aria-selected=true]{color:var(--ink);border-bottom-color:#111827}
.bcount{display:inline-block;margin-left:4px;font-size:12px;background:#F3F5FA;border:1px solid var(--line);border-radius:999px;padding:1px 7px;color:var(--ink)}

/* notebook tabs in the assignment panel */
.nb{margin-top:12px}
.nbtabs{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;position:sticky;top:-18px;z-index:2;background:var(--bg);padding-top:6px}
.nbtabs::-webkit-scrollbar{display:none}
.nbtabs button{flex:none;display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-bottom:0;background:#E2E7F0;color:var(--muted);font:inherit;font-weight:800;font-size:13px;padding:9px 12px;border-radius:12px 12px 0 0;cursor:pointer;min-height:40px;margin-bottom:-1px;text-align:left}
.nbtabs button.on{background:var(--card);color:var(--accent);position:relative;z-index:1}
.nbc{font-size:11px;font-weight:800;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:0 6px;color:var(--ink)}
.nbtabs button.on .nbc{background:var(--accent-soft)}
.nbok{color:#0E9A72;font-weight:900}
.nbpage{min-width:0;background:var(--card);border:1px solid var(--line);border-radius:0 14px 14px 14px;padding:4px 14px 14px}
.nbpage>.card{border:0;box-shadow:none;background:transparent;padding:10px 0;margin:0;border-radius:0}
.nbpage>.card+.card{border-top:1px solid var(--line)}
.nbpage>.row{margin-top:10px}
@media (min-width:600px){
  .nb{display:grid;grid-template-columns:132px 1fr;align-items:start}
  .nbtabs{flex-direction:column;overflow:visible;top:0;padding-top:0;background:transparent;-webkit-mask-image:none!important;mask-image:none!important;padding-right:0!important}
  .nbtabs button{justify-content:space-between;border:1px solid var(--line);border-right:0;border-radius:12px 0 0 12px;margin:0 -1px 0 0;min-height:44px;font-size:12.5px;padding:9px 8px}
  .nbtabs button span:first-child{flex:1}
  .nbpage{border-radius:0 14px 14px 14px;min-height:420px}
}
@media (min-width:1000px){
  .overlay .sheet{max-width:660px}
  .nb{display:grid;grid-template-columns:158px 1fr;align-items:start}
  .nbtabs{flex-direction:column;overflow:visible;top:0;padding-top:0;background:transparent}
  .nbtabs button{justify-content:space-between;border:1px solid var(--line);border-right:0;border-radius:12px 0 0 12px;margin:0 -1px 0 0;min-height:44px}
  .nbtabs button span:first-child{flex:1}
  .nbpage{border-radius:0 14px 14px 14px;min-height:420px}
}
@media (max-width:999px){.nbtabs{-webkit-mask-image:linear-gradient(90deg,#000 85%,transparent);mask-image:linear-gradient(90deg,#000 85%,transparent);padding-right:24px}}
.rubpts{background:var(--accent-soft);border-radius:10px;padding:8px 10px;margin:8px 0;font-size:13.5px}
@media (max-width:599px){
  .nb{display:grid;grid-template-columns:88px 1fr;align-items:start}
  .nbtabs{flex-direction:column;overflow:visible;position:sticky;top:0;padding-top:0;background:transparent;-webkit-mask-image:none!important;mask-image:none!important;padding-right:0!important;gap:3px}
  .nbtabs button{flex-direction:column;align-items:flex-start;justify-content:center;gap:2px;border:1px solid var(--line);border-right:0;border-radius:10px 0 0 10px;margin:0 -1px 0 0;min-height:44px;font-size:11.5px;line-height:1.2;padding:7px 6px;white-space:normal}
  .nbtabs .nbc{font-size:10px}
  .nbpage{border-radius:0 12px 12px 12px;min-height:380px;padding:2px 10px 12px}
  .nbpage .stp{flex-wrap:wrap}
  .nbpage .stp input[type=date]{width:118px;font-size:12px;padding:4px}
  .nbpage #newStepDate{width:118px!important}
}
@media (max-width:599px){
  .nbpage .stp{display:grid!important;grid-template-columns:auto 1fr auto;column-gap:8px;row-gap:4px;align-items:center}
  .nbpage .stp>.chk{grid-column:1;grid-row:1}
  .nbpage .stp>span.grow{grid-column:2;grid-row:1}
  .nbpage .stp>input[type=date]{grid-column:2;grid-row:2;justify-self:start}
  .nbpage .stp>button:last-child:not(.chk){grid-column:3;grid-row:1}
  .nbpage #newStep{min-width:0;flex:1 1 100%}
  .nbpage #newStep+input+button,.nbpage #newStepDate{flex:1}
  .nbpage .row:has(#newStep){flex-wrap:wrap}
}
.sgsrcs{display:grid;gap:4px;margin-top:4px}
.sgsrc{display:flex;gap:8px;align-items:center;font-size:13.5px;padding:6px 8px;border:1px solid var(--line);border-radius:10px;background:var(--bg);cursor:pointer}
.sgsrc input{width:auto;margin:0}
.sgterms{display:grid;gap:6px}.sgterms>div{display:grid;gap:1px;padding:7px 9px;border-radius:10px;background:var(--bg)}.sgterms span{font-size:13.5px;color:var(--muted)}
.sgq{border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:6px 0;background:var(--bg)}.sgq summary{cursor:pointer;font-weight:700;font-size:14px}.sgq[open] summary{margin-bottom:6px}
.sgplan{padding-left:20px;margin:4px 0}.sgplan li{margin:3px 0;font-size:14px}
.authtabs{display:flex;gap:4px;padding:4px;background:#E2E7F0;border-radius:14px;margin:0 0 16px}
.authtabs button{flex:1;border:0;border-radius:11px;padding:10px 12px;min-height:42px;font:inherit;font-weight:800;font-size:14.5px;background:transparent;color:var(--muted);cursor:pointer}
.authtabs button.on{background:var(--card);color:var(--accent);box-shadow:0 1px 2px rgba(42,36,32,.12)}
.gate-or{display:flex;align-items:center;gap:10px;margin:18px 0 12px;color:var(--muted);font-size:13px}
.gate-or::before,.gate-or::after{content:"";flex:1;height:1px;background:var(--line)}
/* paying students don't need the "use sample" shortcuts */
body.dn-real [data-dact^="sample-"],body.dn-real [data-act="sample-notes"],body.dn-real [data-act="fill-sample"],body.dn-real [data-act="try-sample"]{display:none!important}
.bdaycard{display:flex;gap:12px;align-items:center;background:linear-gradient(135deg,#E9EDFF,#FDE7E3);border-color:#D6DEFF}
.bday-emoji{font-size:30px;line-height:1}

/* ================= Bright planner look ================= */
:root{--rule:#E4E8EF;--ring:#B6BECB;--hl:#E9EDFF;--head:'Bricolage Grotesque','Nunito Sans',system-ui,sans-serif}
html,body{background:#FFFFFF}
h1,h2,.serif{font-family:var(--head);color:var(--ink);letter-spacing:-.015em}
header.top h1{font-size:32px;font-weight:800}
.brand{font-family:var(--head);font-weight:800;color:var(--ink)}
.brand svg path{fill:var(--star)}
/* sections are ruled, not boxed */
.card{background:transparent;border:0;border-top:1px solid var(--rule);border-radius:0;box-shadow:none;padding:16px 0;margin:0}
.card h2{font-size:20px;font-weight:800}
.sheet .card,.nbpage>.card{border-top:1px solid var(--rule)}
.chk{border:1.5px solid var(--ring);border-radius:50%;background:transparent;width:24px;height:24px}
.chk.on{background:var(--accent);border-color:var(--accent);color:#fff}
.item{border-top:1px solid var(--rule)}
.btn{border-radius:12px}
.btn.quiet{background:#EEF1F6;color:var(--ink)}
.tag{border-radius:6px}
.encourage{background:none;color:var(--muted);padding:8px 0 10px 58px;margin:0;font-weight:500;font-style:italic;font-size:15px}
.encourage svg{display:none}
nav.tabs{background:#FFFFFF;border-top:1px solid var(--rule)}
nav.tabs button.on svg{background:var(--hl)}
.toast{background:var(--ink)}
.night{background:var(--hl);color:var(--ink)}
.night .muted,.night .small{color:var(--muted)}
.demoband{background:#EEF2FF;border:0;border-radius:14px;padding:14px 16px;margin:10px 0}
.datebar{margin:6px 0 10px}
/* Today agenda */
.ag-sum{color:var(--muted);font-size:14px;margin:2px 0 12px}
.ag-sum b{color:var(--ink)}
.ag-day{display:flex;gap:14px;border-top:1px solid var(--rule);padding:12px 0}
.ag-day.today{border-top:2px solid var(--ink)}
.ag-day.late{border-top:2px solid var(--warn)}
.ag-date{width:44px;flex:none;text-align:center;display:flex;flex-direction:column;gap:2px;line-height:1;padding-top:2px}
.ag-date span{font-size:11px;font-weight:800;letter-spacing:.08em;color:var(--muted)}
.ag-date b{font-family:var(--head);font-size:24px;font-weight:800;color:var(--ink)}
.ag-day.today .ag-date span{color:var(--accent)}
.ag-day.late .ag-date span,.ag-day.late .ag-date b{color:var(--warn)}
.ag-items{flex:1;min-width:0}
.ag-items>.item:first-child{border-top:0;padding-top:2px}
.ag-empty{color:var(--muted);font-size:14px;padding:4px 0}
.nextup{margin-bottom:6px}
.nu-k{font-size:11px;font-weight:800;letter-spacing:.08em;color:var(--accent)}
.nu-row{display:flex;gap:10px;align-items:flex-start;background:var(--hl);border-radius:10px;padding:10px 12px;margin:6px 0 0 -12px}
.nu-t{font-family:var(--head);font-size:22px;font-weight:800;line-height:1.15;color:var(--ink)}
.nu-m{font-size:13.5px;color:var(--muted);margin-top:3px}
.nu-time{font-size:13px;font-weight:800;color:var(--muted);white-space:nowrap;padding-top:6px}
.nu-acts{display:flex;align-items:center;gap:16px;margin:10px 0 4px}
.nu-acts .btn{padding:0 18px}
.linkact{border:0;background:none;font:inherit;font-weight:800;font-size:14px;color:var(--accent);text-decoration:underline;text-underline-offset:3px;min-height:44px;cursor:pointer;padding:0}
.ag-more{display:flex;justify-content:space-between;align-items:baseline;padding:12px 0 4px;border-top:1px solid var(--rule)}
/* assignment = its own page on phones and tablets */
@media (max-width:999px){
  .overlay{background:#FFFFFF;align-items:stretch}
  .sheet{max-width:none;max-height:none;height:100%;border-radius:0;padding:14px 16px 32px}
}
.nbtabs button{background:#E9EDF4;border-color:var(--rule);color:#4B5563}
.nbtabs button.on{background:#FFFFFF;color:var(--ink);box-shadow:inset 3px 0 0 var(--accent)}
.nbpage{background:#FFFFFF;border-color:var(--rule)}
.nbc{background:#FFFFFF;border-color:var(--rule)}
.nbtabs button.on .nbc{background:var(--hl);border-color:var(--hl);color:var(--accent)}
/* computer: an open notebook, your week on the left page, the assignment on the right */
@media (min-width:1000px){
  html,body{background:var(--bg)}
  nav.tabs{background:transparent;border-right:0}
  nav.tabs button.on{background:#FFFFFF}
  .side-class.on{background:#FFFFFF}
  .app{background:#FFFFFF;border-radius:14px;margin-top:20px;margin-bottom:20px;padding:6px 40px 40px;min-height:calc(100vh - 40px);box-shadow:0 1px 2px rgba(17,24,39,.06)}
  .loginbtn{right:40px;top:14px}
  .overlay .sheet{max-width:none;width:calc((100vw - 276px) * .64);height:calc(100vh - 40px);margin:20px 20px 20px 0;border:0;border-radius:0 14px 14px 0;padding:24px 22px 28px 34px;background:#FFFFFF;box-shadow:inset 16px 0 18px -16px rgba(17,24,39,.28)}
  body.panel-open .app{margin-left:256px!important;width:calc((100vw - 276px) * .36);max-width:none!important;border-radius:14px 0 0 14px;box-shadow:inset -16px 0 18px -16px rgba(17,24,39,.28);padding:6px 30px 40px}
  body.panel-open .fab{display:none}
  /* divider tabs stick out of the right edge of the right page */
  .nb{grid-template-columns:minmax(0,1fr) 150px!important}
  .nbtabs{order:2}
  .nbpage{order:1;border-radius:12px 0 12px 12px!important;border-right:1px solid var(--rule)}
  .nbtabs button{border-radius:0 12px 12px 0!important;border:1px solid var(--rule)!important;border-left:0!important;margin:0 0 0 -1px!important}
  .nbtabs button.on{box-shadow:inset -3px 0 0 var(--accent)!important}
  .sheet{margin-right:0}
}
@media (min-width:1000px) and (max-width:1279px){
  body.panel-open .app{display:none}
  .overlay .sheet{width:calc(100vw - 276px);border-radius:14px;box-shadow:0 1px 2px rgba(17,24,39,.06)}
}
.ag-items .cbar,.dhead .cbar{display:none}
.ag-items .item{gap:12px}
.estright{background:none;border:0;padding:0 0 0 6px;color:var(--muted);font-weight:800}
.dhead h2{font-size:26px!important;font-weight:800}
header.top .pill{font-size:12.5px;white-space:nowrap}
.nbpage>.card:first-child{border-top:0}
.item .cbar{display:none}
/* computer proportions: menu 2 · week 4 · assignment 9 (out of 15) */
@media (min-width:1000px){
  :root{--navw:max(168px,calc(100vw * 2 / 15));--rest:calc(100vw - var(--navw) - 20px)}
  nav.tabs{width:var(--navw);padding-left:10px;padding-right:10px}
  nav.tabs button{font-size:14px;padding:8px 8px}
  .side-class{font-size:13.5px;padding:7px 8px}
  .app{margin-left:max(var(--navw),calc((100vw - 760px)/2 + 80px))}
  body.panel-open .app{margin-left:var(--navw)!important;width:calc(var(--rest) * 0.36)!important;padding:6px 22px 40px}
  .overlay .sheet{width:calc(var(--rest) * 0.64)!important}
}
@media (min-width:1000px) and (max-width:1279px){
  .overlay .sheet{width:calc(100vw - var(--navw) - 20px)!important}
}
@media (min-width:1000px){
  header.top .brand{position:fixed;top:30px;left:20px;z-index:31;font-size:22px;white-space:nowrap;margin:0}
  header.top{flex-wrap:wrap;padding-top:22px}
  header.top h1{white-space:nowrap}
  body.panel-open header.top h1{font-size:28px}
  body.panel-open header.top .pill{margin-top:4px}
}
/* logo: star in a blue tile so it stands out on any background */
.brand{gap:10px;color:var(--ink);font-weight:800}
.brand svg{width:38px;height:38px;padding:2px;border-radius:11px;background:var(--accent);box-shadow:0 2px 6px rgba(54,81,240,.35);flex:none}
.brand svg polygon{fill:#FFC233}
.brand svg circle{fill:#3651F0}
@media (min-width:1000px){header.top .brand{font-size:24px;top:24px;left:18px}}
/* logo: gold star traced in blue (no tile) */
.brand svg{background:none!important;box-shadow:none!important;padding:0!important;width:40px;height:40px;overflow:visible}
.brand svg polygon{fill:#FFC233;stroke:#3651F0;stroke-width:4.5;stroke-linejoin:round;paint-order:stroke}
.brand svg polygon:first-of-type{stroke-width:3.5}
.brand svg circle{fill:#3651F0}
.brand svg{width:50px!important;height:50px!important;margin:-6px -6px -6px -8px}
.brand svg polygon{stroke-width:2.6}
.brand svg polygon:first-of-type{stroke-width:2.2}
.brand svg polygon{stroke-width:2}
.brand svg polygon:first-of-type{stroke-width:1.7}
.brand svg.dn-compass{width:40px!important;height:40px!important;margin:0!important;overflow:visible}
.brand{color:#1A2570!important}
header.top{flex-wrap:wrap;row-gap:6px}
header.top h1{white-space:nowrap}
@media (max-width:420px){header.top h1{font-size:30px}}
/* first-run welcome */
.welcome{max-width:520px;margin:18px auto 0;padding:28px 4px 8px;text-align:center}
.welcome-c{display:flex;justify-content:center;margin-bottom:12px}
.welcome-h{font-family:var(--head);font-weight:800;font-size:clamp(30px,5vw,40px);line-height:1.08;color:#1A2570;margin:0 0 10px}
.welcome-p{font-size:17px;color:var(--muted);margin:0 auto 22px;max-width:420px}
.welcome-steps{list-style:none;counter-reset:w;margin:0 0 24px;padding:0;text-align:left;border-top:1px solid var(--rule)}
.welcome-steps li{counter-increment:w;display:grid;grid-template-columns:40px 1fr;column-gap:12px;padding:14px 0;border-bottom:1px solid var(--rule)}
.welcome-steps li::before{content:counter(w);grid-row:1/3;width:32px;height:32px;border-radius:50%;background:var(--hl);color:var(--accent);font-weight:800;display:grid;place-items:center}
.welcome-steps b{font-size:16px;color:var(--ink)}
.welcome-steps span{font-size:14px;color:var(--muted)}
.welcome-go{min-height:52px;font-size:16px}
/* Get the app guide */
.ga-list{list-style:none;padding:0;margin:0 0 16px;display:grid;gap:12px}
.ga-list li{display:flex;gap:12px;align-items:flex-start;line-height:1.45}
.ga-num{flex:none;width:28px;height:28px;border-radius:50%;background:var(--hl,#E9EDFF);color:var(--accent,#3651F0);font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px}
.ga-list svg{color:var(--accent,#3651F0)}
/* Reminder opened from a notification */
.rem-list{display:grid;gap:10px}
.rem-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--rule,#E4E8EF);border-radius:16px;background:#fff}
.rem-item.is-done{opacity:.55}
.rem-dot{flex:none;width:12px;height:12px;border-radius:50%;margin-top:6px}
.rem-t{font-weight:800;font-size:17px;line-height:1.3}