/* Layout: navy signage band with save status, a lesson strip, then a two-column worksheet
   (questions left, live working right) that stacks on phones with a pinned score strip. */
:root{
  --navy:#13294B; --red:#C8102E; --gold:#C9962B; --sky:#DCEAF6;
  --bg:#F3F6FA; --surface:#FFFFFF; --ink:#16233B; --muted:#53607A; --line:#D3DCE8; --track:#E2E9F2;
  --band-bg:#13294B; --band-fg:#FFFFFF; --band-muted:#B8C7DD;
  --accent:#13294B; --bar:#13294B;
  --low:#2C7553; --low-bg:#E2F1E9; --medium:#8F5C0E; --medium-bg:#FBEED6; --high:#B00E28; --high-bg:#FBE3E6;
  --font-display:"Barlow Condensed","Arial Narrow",system-ui,sans-serif;
  --font-body:"Source Sans 3","Segoe UI",system-ui,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --navy:#13294B; --red:#F2697B; --gold:#E2B24C; --sky:#1B2D4A;
    --bg:#0B1322; --surface:#121D33; --ink:#E6ECF5; --muted:#9DABC2; --line:#26375A; --track:#22324D;
    --band-bg:#0E1A30; --band-fg:#FFFFFF; --band-muted:#A3B5D1;
    --accent:#93BCEB; --bar:#93BCEB;
    --low:#74D2A3; --low-bg:#123326; --medium:#F2BA5C; --medium-bg:#38290E; --high:#FF8494; --high-bg:#3F1621;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --navy:#13294B; --red:#F2697B; --gold:#E2B24C; --sky:#1B2D4A;
  --bg:#0B1322; --surface:#121D33; --ink:#E6ECF5; --muted:#9DABC2; --line:#26375A; --track:#22324D;
  --band-bg:#0E1A30; --band-fg:#FFFFFF; --band-muted:#A3B5D1;
  --accent:#93BCEB; --bar:#93BCEB;
  --low:#74D2A3; --low-bg:#123326; --medium:#F2BA5C; --medium-bg:#38290E; --high:#FF8494; --high-bg:#3F1621;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.55;padding-bottom:calc(76px + env(safe-area-inset-bottom,0px))}
[hidden]{display:none!important}
img{max-width:100%}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:8px;top:-60px;z-index:20;background:var(--surface);color:var(--ink);padding:10px 14px;border-radius:8px;border:2px solid var(--gold)}
.skip:focus{top:8px}

.wrap{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.narrow{max-width:640px;margin:0 auto;display:grid;gap:16px}

/* Band */
.preview-banner{background:var(--medium-bg);color:var(--medium);font-size:14px;padding:8px 0;border-bottom:1px solid var(--line)}
.band{background:var(--band-bg);color:var(--band-fg);border-bottom:4px solid var(--gold);padding-top:env(safe-area-inset-top,0px)}
.band-inner{padding-block:16px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 20px}
.band-text{display:grid;gap:2px;min-width:0}
.brand{display:flex;align-items:baseline;flex-wrap:wrap;gap:4px 12px;font-size:14px;color:var(--band-muted);letter-spacing:.03em}
.mark{font-family:var(--font-display);font-weight:700;font-size:22px;letter-spacing:.1em;color:var(--gold)}
.app-title{margin:0;font-family:var(--font-display);font-weight:600;font-size:clamp(26px,4.5vw,36px);line-height:1.05;letter-spacing:.01em}
.account-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;min-width:0}
.account-link{color:var(--band-fg);font-size:15px;text-decoration:underline;text-underline-offset:3px;max-width:26ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:6px 0}
.save-status{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;padding:5px 12px;border-radius:999px;background:rgba(255,255,255,.1);color:var(--band-fg);white-space:nowrap}
.save-status .dot{width:9px;height:9px;border-radius:50%;background:#74D2A3}
.save-status[data-state="saving"] .dot{background:var(--band-muted)}
@media (prefers-reduced-motion:no-preference){.save-status[data-state="saving"] .dot{animation:pulse 1s ease-in-out infinite}}
@keyframes pulse{50%{opacity:.3}}
.save-status[data-state="offline"]{background:#FBEED6;color:#6E4508}
.save-status[data-state="offline"] .dot{background:#8F5C0E}
.save-status[data-state="error"]{background:#FBE3E6;color:#8A0B20}
.save-status[data-state="error"] .dot{background:#B00E28}
.save-status[data-state="conflict"]{background:#FBEED6;color:#6E4508}
.save-status[data-state="conflict"] .dot{background:#8F5C0E}

/* Lesson strip */
.lesson-nav{background:var(--surface);border-bottom:1px solid var(--line)}
.nav-inner{padding-block:10px;display:grid;gap:6px}
.progress{margin:0;font-size:14px;color:var(--muted)}
.lesson-list{list-style:none;margin:0;padding:0;display:flex;gap:6px;overflow-x:auto;scrollbar-width:thin;padding-bottom:2px}
.lesson-list a{display:flex;align-items:center;gap:8px;min-height:44px;padding:6px 14px 6px 8px;border-radius:999px;border:1px solid var(--line);color:var(--ink);text-decoration:none;white-space:nowrap;font-size:15px}
.lesson-list a:hover{border-color:var(--accent)}
.lesson-list a[aria-current="page"]{background:var(--sky);border-color:var(--accent);font-weight:600}
.lesson-list .num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--bg);font-family:var(--font-display);font-weight:600;font-size:15px}

.sync-banner{background:var(--high-bg);color:var(--ink);border-bottom:1px solid var(--line)}
.sync-banner{padding:10px max(16px,env(safe-area-inset-left,0px))}
.sync-banner p{margin:0 auto 6px;max-width:1088px}
.sync-banner .actions{max-width:1088px;margin:0 auto}

/* Page */
main.wrap{padding-block:22px 28px;outline:none}
.lesson-head{display:grid;gap:4px;margin-bottom:18px}
.page-title{font-family:var(--font-display);font-weight:600;font-size:clamp(30px,5vw,44px);line-height:1.05;margin:0;text-wrap:balance;outline:none}
.lede-main{margin:0;color:var(--muted);max-width:62ch}
.loading{color:var(--muted);text-align:center;padding:40px 0}

.layout{display:grid;gap:18px}
.col{display:grid;gap:16px;align-content:start;min-width:0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px;display:grid;gap:14px;min-width:0}
.card p{margin:0}
.eyebrow{margin:0;font-family:var(--font-display);font-weight:600;font-size:14px;letter-spacing:.14em;text-transform:uppercase;color:var(--red)}
h2{margin:0;font-family:var(--font-display);font-weight:600;font-size:26px;line-height:1.1;text-wrap:balance}
.head{display:grid;gap:4px}
.hint{margin:0;color:var(--muted);font-size:15px;max-width:62ch}
.stack{display:grid;gap:14px}

.field{display:grid;gap:6px;font-weight:600;font-size:15px}
input[type=text],input[type=email],input[type=number],textarea{font:inherit;font-weight:400;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-width:0;width:100%}
textarea{resize:vertical;line-height:1.5}
input[aria-invalid="true"]{border-color:var(--high)}
input[type=range]{width:100%;margin:0;height:28px;accent-color:var(--accent);cursor:pointer}

.btn{font:inherit;font-weight:600;font-size:15px;display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:8px 16px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;text-decoration:none}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--navy);border-color:var(--navy);color:#fff}
.btn.danger{background:var(--high);border-color:var(--high);color:#fff}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .btn.danger{color:#2A0710}}
.btn.link{border:0;background:none;text-decoration:underline;color:var(--accent);padding-inline:4px}
.btn.small{min-height:36px;padding:4px 12px;font-size:14px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.err-box{margin:0;padding:10px 12px;border-radius:8px;background:var(--high-bg);color:var(--high);font-weight:600}

/* Calculator (carried over from the original) */
.odds{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:600;font-size:30px}
.odds input{width:5.6em;font-family:var(--font-display);font-weight:600;font-size:28px;padding:2px 10px;font-variant-numeric:tabular-nums}
.ends{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted)}
.err{margin:0;color:var(--high);font-size:13px}
.harms{display:grid}
.harm{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 14px;align-items:center;padding-block:12px}
.harm + .harm{border-top:1px solid var(--line)}
.harm:first-child{padding-top:0}
.harm-head{grid-column:1/-1;display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.harm-name{font-weight:600}
.weight{font-family:var(--font-display);font-weight:600;font-size:17px;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.harm-eg{grid-column:1/-1;margin:0;color:var(--muted);font-size:14px}
.harm .err{grid-column:1/-1}
.pct{display:flex;align-items:center;gap:4px}
.pct input{width:4.8em;text-align:right;font-variant-numeric:tabular-nums;padding:8px 10px}
.total{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 12px;padding:10px 12px;border-radius:8px;background:var(--bg);font-size:15px}
.total.bad{background:var(--medium-bg);color:var(--medium)}
.total b{font-variant-numeric:tabular-nums}
.fix{font:inherit;font-size:14px;font-weight:600;color:inherit;background:transparent;border:1px solid currentColor;border-radius:8px;padding:5px 10px;cursor:pointer;min-height:36px}
.score-top{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:10px 16px}
.score-label{margin:0;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.score{margin:0;font-family:var(--font-display);font-weight:700;font-size:clamp(58px,10vw,78px);line-height:.95;font-variant-numeric:tabular-nums}
.pill{display:inline-flex;align-items:center;border-radius:999px;padding:5px 12px;font-weight:600;font-size:15px;white-space:nowrap}
.pill[data-band="low"]{background:var(--low-bg);color:var(--low)}
.pill[data-band="medium"]{background:var(--medium-bg);color:var(--medium)}
.pill[data-band="high"]{background:var(--high-bg);color:var(--high)}
.cat{margin:0;font-size:15px;color:var(--muted)}
.meter{position:relative;padding-top:14px}
.pointer{position:absolute;top:0;width:0;height:0;transform:translateX(-50%);border-left:8px solid transparent;border-right:8px solid transparent;border-top:11px solid var(--ink)}
@media (prefers-reduced-motion:no-preference){.pointer{transition:left .3s ease}.bar span{transition:width .3s ease}}
.zones{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:3px}
.zone{padding:8px 10px;border-radius:6px;font-size:13px;line-height:1.3}
.zone b{display:block;font-size:14px}
.zone.low{background:var(--low-bg);color:var(--low)}
.zone.medium{background:var(--medium-bg);color:var(--medium)}
.zone.high{background:var(--high-bg);color:var(--high)}
.work{display:grid;gap:12px}
.wrow{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 12px;align-items:baseline}
.wrow .nm{font-weight:600}
.wrow .calc{color:var(--muted);font-size:14px;font-variant-numeric:tabular-nums}
.wrow .pts{grid-row:1/3;grid-column:2;align-self:center;font-family:var(--font-display);font-weight:600;font-size:22px;text-align:right;font-variant-numeric:tabular-nums}
.bar{grid-column:1/-1;height:8px;margin-top:4px;background:var(--track);border-radius:4px;overflow:hidden}
.bar span{display:block;height:100%;background:var(--bar)}
.sum{display:flex;justify-content:space-between;align-items:baseline;gap:12px;border-top:1px solid var(--line);padding-top:10px}
.sum .v{font-family:var(--font-display);font-weight:600;font-size:24px;font-variant-numeric:tabular-nums}
.sum.final .v{color:var(--accent);font-size:28px}
.driver{margin:0;padding:12px 14px;border-left:3px solid var(--gold);background:var(--bg);font-size:15px}
.status{font-size:14px;color:var(--muted)}
#copy-fallback{min-height:9em;font-size:14px}
.mini{position:fixed;left:0;right:0;bottom:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--surface);border-top:1px solid var(--line);padding-top:10px;padding-bottom:calc(10px + env(safe-area-inset-bottom,0px));padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.mini-l{display:flex;align-items:baseline;gap:8px;min-width:0}
.mini .ms{font-family:var(--font-display);font-weight:700;font-size:30px;line-height:1;font-variant-numeric:tabular-nums}
.mini .mo{font-size:14px;color:var(--muted);white-space:nowrap}
#learner-cards{display:grid;gap:16px}

/* Learner cards */
.check{display:flex;align-items:center;gap:12px;font-weight:600;cursor:pointer;min-height:44px}
.check input{width:24px;height:24px;accent-color:var(--accent);flex:none}
.quiz-learner{display:grid;gap:16px;margin-top:16px}
.opt-label{font-weight:400;color:var(--muted)}
.check.consent{font-weight:400;align-items:flex-start;padding:12px;border:1px solid var(--line);border-radius:8px}
.check.consent input{margin-top:2px}

/* Lesson 1 */
.steps{display:grid;gap:14px}
.steps > div{display:grid;gap:4px;padding-left:12px;border-left:3px solid var(--gold)}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:8px 10px 8px 0;border-bottom:1px solid var(--line);vertical-align:top}
thead th{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
tbody th{font-weight:600}
td:nth-child(2){font-family:var(--font-display);font-weight:600;font-size:17px;white-space:nowrap}
.formula{margin:0;padding:12px 14px;background:var(--bg);border-radius:8px;font-weight:600}
fieldset.q{border:0;margin:0;padding:0;display:grid;gap:8px}
fieldset.q + fieldset.q{border-top:1px solid var(--line);padding-top:16px}
legend{font-weight:600;padding:0;margin-bottom:6px}
.qnum{font-family:var(--font-display);color:var(--red)}
.opt{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;cursor:pointer;min-height:44px}
.opt:hover{border-color:var(--accent)}
.opt:has(input:checked){background:var(--sky);border-color:var(--accent)}
.opt input{margin-top:4px;width:18px;height:18px;accent-color:var(--accent);flex:none}
.feedback{margin:0;font-size:15px}
.feedback[data-ok="yes"]{color:var(--low)}
.feedback[data-ok="no"]{color:var(--high)}

/* Conflict */
.conflict{background:var(--medium-bg);border:1px solid var(--medium);border-radius:12px;padding:16px 20px;margin-bottom:18px;display:grid;gap:10px}
.conflict h2{font-size:22px}
.conflict p,.conflict ul{margin:0}
.conflict ul{padding-left:20px}

/* Pager */
.pager{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin-top:22px}

/* Account */
.progress-list{list-style:none;margin:0;padding:0;display:grid}
.progress-list li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;border-top:1px solid var(--line)}
.progress-list li:first-child{border-top:0;padding-top:0}
.tag{font-size:14px;font-weight:600;border-radius:999px;padding:3px 10px;white-space:nowrap;background:var(--bg);color:var(--muted)}
.tag[data-s="done"]{background:var(--low-bg);color:var(--low)}
.tag[data-s="part"]{background:var(--medium-bg);color:var(--medium)}
.card.danger{border-color:var(--high)}
.card.danger h2{color:var(--high)}

dialog{border:1px solid var(--line);border-radius:12px;padding:22px;max-width:min(480px,calc(100vw - 32px));background:var(--surface);color:var(--ink)}
dialog::backdrop{background:rgba(11,19,34,.6)}
dialog p{margin:0}

.foot{padding-block:4px 32px;display:grid;gap:8px;color:var(--muted);font-size:14px}
.foot p{margin:0;max-width:78ch}

@media (min-width:900px){
  .layout{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:start;gap:24px}

  .mini{display:none}
  body{padding-bottom:0}
}
@media (max-width:899px){
  body:not(:has(.mini)){padding-bottom:env(safe-area-inset-bottom,0px)}
}