/* Builders Club — MVP Worksheet demo. Brand system per mockups/worksheets/_BRIEF.md */
:root{
--pad:#fbf4df; --pad-2:#f6edcf; --surface:#ffffff; --hair:#e7dcba;
--ink:#181a1f; --muted:#4f5560; --border:#181a1f;
--accent:#4886f3; --accent-h:#2f6fe0;
--coral:#ff635e; --yellow:#fddf67; --green:#1fb87a; --red-deep:#d6362b;
--blue-tint:#e4ecfd; --coral-tint:#ffe5e2; --yellow-tint:#f6e9af; --green-tint:#d7f0e2;
--gridline:rgba(31,107,255,.10); --gridline2:rgba(31,107,255,.18);
--radius:14px; --radius-btn:12px; --radius-sm:8px;
--shadow:3px 3px 0 var(--ink); --shadow-h:4px 4px 0 var(--ink);
--shadow-sm:1.5px 1.5px 0 var(--ink); --shadow-lg:6px 6px 0 var(--ink);
--font-display:'Archivo Black',sans-serif; --font-body:'Space Grotesk',system-ui,sans-serif;
--font-mono:'Space Mono',monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--pad);color:var(--ink);font-family:var(--font-body);-webkit-font-smoothing:antialiased}
.pad-bg{position:fixed;inset:0;z-index:0;pointer-events:none;
background-image:
linear-gradient(var(--gridline) 1px,transparent 1px),
linear-gradient(90deg,var(--gridline) 1px,transparent 1px),
linear-gradient(var(--gridline2) 1.5px,transparent 1.5px),
linear-gradient(90deg,var(--gridline2) 1.5px,transparent 1.5px);
background-size:26px 26px,26px 26px,130px 130px,130px 130px;
filter:blur(1.5px);}
.gearfield{position:fixed;inset:0;z-index:1;pointer-events:none;overflow:hidden;filter:blur(6px);opacity:.7}
.mg{position:absolute;opacity:.55;will-change:transform}
/* every gear hangs off the screen edge — none float in open space */
.mg-l1{left:-46px;top:18vh}
.mg-l2{left:-32px;top:44vh}
.mg-r1{right:-58px;top:26vh}
.mg-r2{right:-30px;top:62vh}
@media(max-width:1180px){.gearfield{display:none}}
/* ----- sticky header ----- */
.topbar{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:3px solid var(--ink);box-shadow:0 4px 0 var(--ink)}
.topbar-inner{max-width:1080px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);cursor:pointer}
.brand img{width:34px;height:34px;display:block}
.brand .wm{font-family:var(--font-display);font-size:16px;letter-spacing:.01em;line-height:1}
.brand .kick{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.14em;color:var(--muted);text-transform:uppercase;margin-top:2px}
.spacer{flex:1 1 30px}
.stat{display:flex;align-items:center;gap:7px;font-family:var(--font-mono);font-size:12px;font-weight:700;
border:2px solid var(--ink);background:var(--pad-2);border-radius:999px;padding:5px 11px;box-shadow:var(--shadow-sm);white-space:nowrap}
.stat .num{font-family:var(--font-display);font-size:13px}
.stat.xp{background:var(--yellow-tint)}
.stat.streak{background:var(--coral-tint)}
.export-btn{font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.05em;background:var(--blue-tint);color:var(--ink);
border:2px solid var(--ink);border-radius:999px;padding:6px 13px;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s}
.export-btn:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
.export-btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.gear-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;font-size:16px;line-height:1;
color:var(--ink);background:var(--pad-2);border:2px solid var(--ink);border-radius:999px;text-decoration:none;
box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s}
.gear-btn:hover{transform:translate(-1px,-1px) rotate(20deg);box-shadow:var(--shadow-h)}
/* settings page */
.opt-list{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.opt{display:flex;align-items:center;gap:13px;text-align:left;width:100%;font-family:var(--font-body);
background:var(--pad-2);border:2.5px solid var(--ink);border-radius:var(--radius-sm);padding:13px 15px;
cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s,background .15s}
.opt:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
.opt.sel{background:var(--blue-tint)}
.opt-radio{width:20px;height:20px;flex:0 0 auto;border:2.5px solid var(--ink);border-radius:999px;background:#fff;
display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--accent-h)}
.opt-main{flex:1 1 auto;display:flex;flex-direction:column;gap:3px;min-width:0}
.opt-title{font-family:var(--font-display);font-size:14px}
.opt-desc{font-size:12.5px;color:var(--muted);line-height:1.45}
.chip{font-family:var(--font-mono);font-size:10px;font-weight:700;letter-spacing:.04em;border:2px solid var(--ink);
border-radius:999px;padding:3px 9px;background:#fff;white-space:nowrap;flex:0 0 auto}
.chip.ok{background:var(--green-tint);color:#0e7a4f}
.chip.warn{background:var(--coral-tint);color:var(--red-deep)}
.active-note{font-family:var(--font-mono);font-size:12px;color:var(--muted);margin:16px 0 0}
/* ----- page shell ----- */
.sheet{position:relative;z-index:2;max-width:780px;margin:0 auto;padding:30px 20px 90px}
.hero{margin:22px 0 42px}
.hero .kicker,.ws-head .kicker{display:inline-block;font-family:var(--font-mono);font-size:11px;font-weight:700;text-transform:uppercase;
letter-spacing:.13em;background:var(--yellow);border:2.5px solid var(--ink);border-radius:999px;padding:5px 12px;box-shadow:var(--shadow-sm);transform:rotate(-1.3deg)}
.ws-head .kicker{background:var(--blue-tint);transform:rotate(-.8deg)}
.hero h1{font-family:var(--font-display);font-size:clamp(30px,6vw,48px);line-height:.98;margin:16px 0 10px}
.hero p{font-size:16px;color:var(--muted);max-width:62ch;margin:0 0 6px;line-height:1.5}
.crumb{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;font-weight:700;
color:var(--ink);background:var(--surface);border:2px solid var(--ink);border-radius:999px;padding:6px 14px;cursor:pointer;
box-shadow:var(--shadow-sm);text-decoration:none;margin:16px 0 0;transition:transform .12s,box-shadow .12s}
.crumb:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
/* ----- section / step cards ----- */
.section{position:relative;background:var(--surface);border:2.5px solid var(--ink);border-radius:var(--radius);
padding:26px 24px 24px;margin:0 0 34px;box-shadow:var(--shadow);
transition:transform .45s cubic-bezier(.2,.8,.2,1),box-shadow .45s,opacity .45s,filter .45s,border-color .45s}
.section::before{content:"";position:absolute;left:-2.5px;top:24px;bottom:24px;width:6px;border-radius:6px;background:transparent;transition:background .4s}
.section.is-active{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.section.is-active::before{background:var(--accent)}
.section.is-locked{opacity:.55;filter:grayscale(.45);box-shadow:var(--shadow-sm);transform:scale(.985)}
.section.is-done{border-color:var(--green);opacity:.97}
.section.is-done::before{background:var(--green)}
.section.is-mastered{border-color:var(--yellow);opacity:.97}
.section.is-mastered::before{background:var(--yellow)}
.section.clickable{cursor:pointer}
.section.clickable:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.sec-head{display:flex;align-items:flex-start;gap:12px}
.sec-num{font-family:var(--font-display);font-size:26px;line-height:1;background:var(--ink);color:var(--pad);
border:2.5px solid var(--ink);border-radius:10px;width:46px;height:46px;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.section.is-active .sec-num{background:var(--accent);color:#fff}
.section.is-done .sec-num{background:var(--green);color:#fff}
.section.is-mastered .sec-num{background:var(--yellow);color:var(--ink)}
.sec-headtext{flex:1 1 auto;min-width:0}
.sec-kicker{font-family:var(--font-mono);font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.sec-title{font-family:var(--font-display);font-size:22px;line-height:1.05;margin:3px 0 0}
.sec-tagline{font-size:14.5px;color:var(--muted);margin:10px 0 0;line-height:1.45}
.sec-prompt{font-size:15.5px;line-height:1.5;margin:14px 0 0;font-weight:500}
.redo-btn{position:absolute;top:14px;right:14px;z-index:3;font-family:var(--font-mono);font-size:10.5px;font-weight:700;
letter-spacing:.06em;background:var(--coral-tint);color:var(--ink);border:2px solid var(--ink);border-radius:999px;
padding:5px 11px;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s,background .12s}
.redo-btn:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h);background:var(--coral);color:#fff}
.redo-btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.flow-topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:20px 0 0}
.flow-topbar .crumb{margin:0}
.book-btn{flex:0 0 auto;width:42px;height:42px;border:2.5px solid var(--ink);border-radius:var(--radius-btn);
background:var(--yellow-tint);font-size:19px;cursor:pointer;box-shadow:var(--shadow-sm);line-height:1;
display:flex;align-items:center;justify-content:center;transition:transform .12s,box-shadow .12s}
.book-btn:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
.book-btn.open{background:var(--yellow)}
/* step progress dots on hub cards */
.stepdots{display:flex;gap:7px;flex-wrap:wrap;margin:14px 0 0;align-items:center}
.stepdot{width:20px;height:20px;flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;
font-family:var(--font-mono);font-size:10px;font-weight:700;border:2px solid var(--ink);border-radius:999px;
background:var(--pad-2);color:var(--muted)}
.stepdot.done{background:var(--green-tint);color:#0e7a4f}
.stepdot.mastered{background:var(--yellow-tint);color:var(--ink)}
.stepdot.current{background:var(--blue-tint)}
/* focus-mode step rail (flow view) */
.sheet.wide{max-width:980px}
.hero.compact{margin:34px 0 20px}
.hero.compact h1{font-size:clamp(24px,4.5vw,34px);margin:0}
.steprail{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;row-gap:10px;flex:1 1 auto}
.railstep{width:36px;height:36px;flex:0 0 auto;padding:0;display:flex;align-items:center;justify-content:center;
font-family:var(--font-mono);font-size:13px;font-weight:700;border:2.5px solid var(--ink);border-radius:999px;
background:var(--surface);color:var(--muted);cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s}
.railstep:hover:not(:disabled){transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
.railstep:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.railstep.done{background:var(--green-tint);color:#0e7a4f}
.railstep.mastered{background:var(--yellow-tint);color:var(--ink)}
.railstep.current{background:var(--blue-tint);color:var(--accent-h)}
.railstep.viewing{background:var(--accent);color:#fff;box-shadow:var(--shadow);transform:translateY(-1px)}
.railtick{width:12px;flex:0 0 auto;border-top:2.5px dashed var(--hair)}
.focus-nav{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:22px}
.flow-actions{display:flex;align-items:center;gap:10px;margin-left:auto}
.mode-btn{font-family:var(--font-mono);font-size:10.5px;font-weight:700;letter-spacing:.06em;background:var(--blue-tint);color:var(--ink);
border:2px solid var(--ink);border-radius:999px;padding:5px 11px;cursor:pointer;box-shadow:var(--shadow-sm);
white-space:nowrap;transition:transform .12s,box-shadow .12s}
.mode-btn:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
/* focus mode: the step card owns the screen */
.section.focus{display:flex;flex-direction:column;min-height:calc(100vh - 250px);padding:32px 36px;margin:24px 0 0}
.section.focus .sec-title{font-size:26px}
.section.focus .sec-prompt{font-size:16px}
.section.focus .answer-wrap{flex:1 1 auto;display:flex;flex-direction:column}
.section.focus textarea.answer{flex:1 1 auto;min-height:180px;font-size:16px}
@media(max-width:760px){.section.focus{min-height:0;padding:22px 20px}}
/* artifact stamp on hub */
.artifact-stamp{margin:16px 0 0;background:var(--green-tint);border:2.5px solid var(--green);border-radius:var(--radius-sm);
padding:13px 15px;box-shadow:var(--shadow-sm)}
.artifact-stamp .alabel{font-family:var(--font-mono);font-size:10px;font-weight:700;letter-spacing:.12em;color:#0e7a4f;text-transform:uppercase;margin-bottom:6px}
.artifact-stamp .atext{font-size:14.5px;line-height:1.5;white-space:pre-wrap}
.lock-overlay{display:flex;align-items:center;gap:10px;margin-top:14px;font-family:var(--font-mono);font-size:12.5px;font-weight:700;color:var(--muted)}
.lock-overlay .lk{font-size:18px}
/* mastered badge */
.mastered-badge{display:flex;align-items:center;gap:10px;margin-top:14px;background:var(--yellow-tint);border:2.5px solid var(--ink);
border-radius:var(--radius-sm);padding:10px 14px;box-shadow:var(--shadow-sm)}
.mastered-badge .mb-big{font-family:var(--font-display);font-size:13px}
.mastered-badge .mb-why{font-size:12.5px;color:var(--muted);flex:1 1 auto}
.mastered-badge button{margin-left:auto}
/* pinned "building on" cards */
.buildson-wrap{display:flex;flex-direction:column;gap:10px;margin:14px 0 0}
.buildson{border:2px solid var(--yellow);border-radius:var(--radius-sm);
background:var(--yellow-tint);padding:10px 14px}
.buildson .bo-label{font-family:var(--font-mono);font-size:9.5px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;
color:var(--muted);display:block;margin-bottom:5px}
/* capped at 120px by an inline height from sizeRecapBoxes — NOT max-height,
which would also clamp the resize handle and stop students dragging it taller.
Only a card that actually got capped is hiding text, so only it can be dragged. */
.buildson .bo-text{font-size:13.5px;line-height:1.5;white-space:pre-wrap;overflow-y:auto}
.buildson .bo-text.is-capped{resize:vertical}
.buildson.empty{background:var(--pad-2);border-color:var(--hair)}
.buildson .bo-note{font-size:12.5px;color:var(--muted);line-height:1.45}
/* curated external reading */
.resources{margin:14px 0 0;border:2px solid var(--yellow);border-radius:var(--radius-sm);background:var(--yellow-tint);
padding:10px 14px;font-size:13px;line-height:1.7}
.resources .rs-label{font-family:var(--font-mono);font-size:9.5px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;
color:var(--muted);display:block;margin-bottom:4px}
.resources .rs-link{color:var(--ink);font-weight:600;text-decoration:underline}
.resources .rs-link:hover{color:var(--accent-h)}
.resources .rs-note{color:var(--muted);font-size:12.5px}
/* links into the extras shelf — same block, different colour so they read as "in here, not out there" */
.resources.is-internal{border-color:var(--accent);background:var(--blue-tint)}
/* lesson panel */
.lesson{margin:0;border:0 dashed var(--ink);border-radius:var(--radius-sm);background:var(--pad-2);
padding:0 16px;max-height:0;overflow:hidden;opacity:0;transition:max-height .4s ease,opacity .3s,padding .4s,margin .4s,border-width .4s}
/* the closed panel hides its overflow so the collapse animates; once open,
a lesson taller than the cap scrolls instead of being cut off silently */
.lesson.open{max-height:680px;opacity:1;padding:15px 16px;margin:20px 0 0;border-width:2.5px;overflow-y:auto}
.lesson h4{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;margin:0 0 6px;color:var(--accent-h)}
.lesson p{margin:0 0 12px;font-size:14px;line-height:1.5}
.ex{border:2px solid var(--ink);border-radius:var(--radius-sm);padding:9px 12px;margin:0 0 10px;font-size:13.5px;line-height:1.45;box-shadow:var(--shadow-sm)}
.ex .tag{font-family:var(--font-mono);font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;display:block;margin-bottom:3px}
.ex.good{background:var(--green-tint)} .ex.good .tag{color:#0e7a4f}
.ex.bad{background:var(--coral-tint)} .ex.bad .tag{color:var(--red-deep)}
.ex em{font-style:normal;color:var(--muted)}
/* answer area */
.answer-wrap{margin:22px 0 0}
.field-label{font-family:var(--font-mono);font-size:10.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:6px}
textarea.answer{width:100%;min-height:110px;resize:vertical;font-family:var(--font-body);font-size:15px;line-height:1.5;
color:var(--ink);background:#fff;border:2.5px solid var(--ink);border-radius:var(--radius-sm);padding:11px 13px;outline:none;transition:box-shadow .15s,opacity .3s}
textarea.answer:focus{box-shadow:var(--shadow-sm)}
textarea.answer.dimmed{opacity:.5;background:var(--pad-2)}
textarea.answer:disabled{cursor:not-allowed}
.answer-tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:16px}
.btn{font-family:var(--font-display);font-size:14px;border:2.5px solid var(--ink);border-radius:var(--radius-btn);
background:var(--accent);color:#fff;padding:9px 16px;cursor:pointer;box-shadow:var(--shadow);line-height:1;
transition:transform .12s,box-shadow .12s,background .15s}
.btn:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h);background:var(--accent-h)}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:var(--shadow)}
.btn.white{background:#fff;color:var(--ink)} .btn.white:hover{background:var(--pad-2)}
.btn.green{background:var(--green)} .btn.green:hover{background:#179a64}
.ask-btn{font-family:var(--font-mono);font-size:12px;font-weight:700;background:var(--blue-tint);color:var(--ink);
border:2px solid var(--ink);border-radius:999px;padding:7px 13px;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s}
.ask-btn:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h)}
.ask-btn:disabled{opacity:.4;cursor:not-allowed}
.req-note{font-family:var(--font-mono);font-size:10.5px;color:var(--muted)}
/* video */
.video-frame{position:relative;margin:16px 0 0;border:2.5px solid var(--ink);border-radius:var(--radius-sm);overflow:hidden;
box-shadow:var(--shadow);background:#000;aspect-ratio:16/9}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%}
.video-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:11px}
.video-progress{flex:1 1 160px;height:12px;border:2px solid var(--ink);border-radius:999px;background:var(--pad-2);overflow:hidden;box-shadow:var(--shadow-sm)}
.video-progress .vp-fill{height:100%;background:var(--accent);width:0%;transition:width .5s linear}
.video-readout{font-family:var(--font-mono);font-size:11px;font-weight:700;color:var(--muted);white-space:nowrap}
.recap{margin-top:18px;background:var(--blue-tint);border:2.5px solid var(--ink);border-radius:var(--radius-sm);padding:13px 15px;box-shadow:var(--shadow-sm)}
.recap h4{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 8px;color:var(--accent-h)}
.recap ul{margin:0;padding-left:18px}
.recap li{font-size:13.5px;line-height:1.55}
/* review thread */
.review{margin-top:16px;display:none;flex-direction:column;gap:12px}
.review.show{display:flex}
.review-head{font-family:var(--font-mono);font-size:10.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-h);
display:flex;align-items:center;gap:8px;border-top:2px dashed var(--hair);padding-top:14px;cursor:pointer;user-select:none}
.review-head:hover{color:var(--ink)}
.review-head img{width:16px;height:16px}
.review-head .chev{margin-left:auto;font-size:13px;transition:transform .25s}
.review.collapsed .review-head .chev{transform:rotate(-90deg)}
.review.collapsed .msg{display:none}
.msg{display:flex;gap:10px;animation:slidein .35s cubic-bezier(.2,.8,.2,1)}
@keyframes slidein{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.msg-avatar{flex:0 0 auto;width:30px;height:30px;border:2px solid var(--ink);border-radius:8px;background:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);overflow:hidden;font-size:15px}
.msg-avatar img{width:22px;height:22px;display:block}
.msg-body{flex:1 1 auto;min-width:0;border:2px solid var(--ink);border-radius:var(--radius-sm);padding:10px 13px;box-shadow:var(--shadow-sm)}
.msg.agent .msg-body{background:var(--blue-tint)}
.msg.agent.good .msg-body{background:var(--green-tint);border-color:var(--green)}
.msg.agent.hint .msg-body{background:var(--yellow-tint)}
.msg.agent.offline .msg-body{background:var(--coral-tint)}
.msg.user{flex-direction:row-reverse}
.msg.user .msg-body{background:#fff;max-width:80%}
.msg-tag{font-family:var(--font-mono);font-size:9.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-h);margin-bottom:4px}
.msg.user .msg-tag{color:var(--muted);text-align:right}
.msg.good .msg-tag{color:#0e7a4f}
.msg-text{font-size:14.5px;line-height:1.6;overflow-wrap:break-word}
.msg-text p{margin:0 0 9px}
.msg-text ul,.msg-text ol{margin:0 0 9px;padding-left:20px;display:flex;flex-direction:column;gap:6px}
.msg-text>*:last-child{margin-bottom:0}
.msg-text code{font-family:var(--font-mono);font-size:12.5px;background:#fff;border:1px solid var(--hair);border-radius:4px;padding:1px 5px}
.thinking-row{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:13.5px}
.spinner{width:18px;height:18px;border:2px solid var(--hair);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;flex:0 0 auto}
@keyframes spin{to{transform:rotate(360deg)}}
/* done / saved states */
.done-stamp{display:flex;align-items:center;gap:10px;margin-top:20px;background:var(--green-tint);border:2.5px solid var(--green);
border-radius:var(--radius-sm);padding:11px 14px;box-shadow:var(--shadow-sm);animation:slidein .4s}
.done-stamp .big{font-family:var(--font-display);font-size:15px;color:#0e7a4f}
.done-stamp .xpgain{margin-left:auto;font-family:var(--font-mono);font-size:12px;font-weight:700;background:var(--yellow);border:2px solid var(--ink);border-radius:999px;padding:4px 10px;box-shadow:var(--shadow-sm)}
.prev-answer{margin-top:16px;border:2px solid var(--hair);border-radius:var(--radius-sm);background:var(--pad-2);padding:10px 13px;font-size:13.5px;line-height:1.5;color:var(--muted);white-space:pre-wrap}
.prev-answer .pa-label{font-family:var(--font-mono);font-size:9.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;display:block;margin-bottom:4px}
/* manual-copy fallback for blocked clipboards */
.copy-fallback{margin-top:14px;border:2.5px dashed var(--ink);border-radius:var(--radius-sm);background:var(--yellow-tint);padding:12px 14px}
.copy-fallback .cf-note{font-size:12.5px;line-height:1.5;margin-bottom:8px}
.copy-fallback .cf-note a{color:var(--accent-h);cursor:pointer;text-decoration:underline;font-weight:700}
.copy-fallback textarea{width:100%;height:120px;resize:vertical;font-family:var(--font-mono);font-size:11px;line-height:1.45;
border:2px solid var(--ink);border-radius:var(--radius-sm);background:#fff;padding:8px 10px}
.shake{animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
footer.foot{position:relative;z-index:2;max-width:780px;margin:0 auto;padding:0 20px 60px;text-align:center}
footer.foot .line{font-family:var(--font-mono);font-size:11px;color:var(--muted);letter-spacing:.06em;border-top:2px dashed var(--hair);padding-top:18px}
.finale{text-align:center}
.finale .trophy{font-size:38px}
/* latest AI feedback — always visible under the answer box */
.review-latest{margin-top:22px;animation:slidein .35s cubic-bezier(.2,.8,.2,1)}
.review-latest .rl-head{font-family:var(--font-mono);font-size:10.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-h);
display:flex;align-items:center;gap:8px;border-top:2px dashed var(--hair);padding:14px 0 10px}
.review-latest .rl-head img{width:16px;height:16px}
.review-latest .rl-body{display:flex;flex-direction:column;gap:12px}
/* two-sided scoreboard */
.board{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0 0;transition:opacity .3s}
.board.cols-3{grid-template-columns:1fr 1fr 1fr}
@media(max-width:900px){.board.cols-3{grid-template-columns:1fr}}
@media(max-width:700px){.board{grid-template-columns:1fr}}
.board.dimmed{opacity:.5;pointer-events:none}
.board-col{border:2.5px solid var(--ink);border-radius:var(--radius-sm);padding:12px;display:flex;flex-direction:column;gap:9px;box-shadow:var(--shadow-sm)}
.board-col[data-tint="0"]{background:var(--blue-tint)}
.board-col[data-tint="1"]{background:var(--yellow-tint)}
.board-col[data-tint="2"]{background:var(--coral-tint)}
.bd-head{display:flex;flex-direction:column;gap:1px;margin-bottom:2px}
.bd-label{font-family:var(--font-display);font-size:13.5px}
.bd-hint{font-family:var(--font-mono);font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.bd-cardwrap{position:relative}
.bd-card{width:100%;min-height:58px;resize:vertical;font-family:var(--font-body);font-size:13.5px;line-height:1.45;color:var(--ink);
background:#fff;border:2px solid var(--ink);border-radius:var(--radius-sm);padding:8px 26px 8px 10px;outline:none;box-shadow:var(--shadow-sm)}
.bd-card:focus{box-shadow:var(--shadow)}
.bd-del{position:absolute;top:6px;right:6px;width:20px;height:20px;line-height:1;font-size:10px;font-weight:700;
border:2px solid var(--ink);border-radius:999px;background:#fff;color:var(--muted);cursor:pointer;padding:0}
.bd-del:hover{background:var(--coral);color:#fff}
.bd-add{align-self:flex-start}
/* add-a-box list answers (rules, checklists) */
.list-answer{display:flex;flex-direction:column;gap:11px;transition:opacity .3s}
.list-answer.dimmed{opacity:.5;pointer-events:none}
/* boxes grow downwards as the text wraps, so the number badge and the ✕ sit
against the FIRST line rather than floating to the middle of a tall box */
.li-row{display:flex;align-items:flex-start;gap:9px}
.li-num{flex:0 0 auto;width:26px;height:26px;margin-top:9px;display:flex;align-items:center;justify-content:center;
font-family:var(--font-display);font-size:12px;border:2px solid var(--ink);border-radius:999px;background:var(--yellow);box-shadow:var(--shadow-sm)}
/* a textarea, not an : long answers wrap and the box gets taller
(height is set by autoGrow in app.js) instead of scrolling sideways */
.li-input{flex:1 1 auto;display:block;font-family:var(--font-body);font-size:14.5px;line-height:1.45;color:var(--ink);background:#fff;
border:2.5px solid var(--ink);border-radius:var(--radius-sm);padding:9px 12px;outline:none;transition:box-shadow .15s;
resize:none;overflow:hidden}
.li-input:focus{box-shadow:var(--shadow-sm)}
.li-del{flex:0 0 auto;width:24px;height:24px;margin-top:10px;line-height:1;font-size:11px;font-weight:700;border:2px solid var(--ink);
border-radius:999px;background:#fff;color:var(--muted);cursor:pointer;padding:0}
.li-del:hover{background:var(--coral);color:#fff}
.li-add-row{display:flex;align-items:flex-start;gap:9px;width:100%;background:none;border:none;padding:0;cursor:pointer;text-align:left}
.li-add-row .li-num{background:var(--pad-2);color:var(--muted);border-style:dashed;box-shadow:none}
/* line-height matches .li-input so the ghost row is exactly one box tall */
.li-add-box{flex:1 1 auto;font-family:var(--font-body);font-size:14.5px;line-height:1.45;color:var(--muted);background:transparent;
border:2.5px dashed var(--ink);border-radius:var(--radius-sm);padding:9px 12px;opacity:.7;transition:opacity .15s,background .15s}
.li-add-row:hover .li-add-box{opacity:1;background:#fff}
/* once ✕ buttons appear beside the real boxes, the ghost row shrinks to stay flush with them */
.list-answer:has(.li-del) .li-add-row{padding-right:33px}
/* numbered lists: same rhythm as title→prompt (14px) above the label and under the ghost row */
.answer-wrap:has(.list-answer){margin-top:14px}
.answer-wrap:has(.list-answer) .answer-tools{margin-top:14px}
/* focus view: list cards hug their content instead of stretching to fill the screen,
so spacing matches the scroll view */
.section.focus:has(.list-answer){min-height:0}
/* multi-box answers (step.fields): each box keeps its own label, and the second
one sits a title-to-prompt gap below the first instead of touching it */
.field-box.stacked{margin-top:18px}
/* focus view: two stacked boxes share the height instead of one filling the screen */
.section.focus .field-box textarea.answer{min-height:150px}
/* walkthrough guide checklist */
.guide{margin:16px 0 0;padding:14px 16px 14px 38px;border:2.5px solid var(--ink);border-radius:var(--radius-sm);
background:var(--pad-2);box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:9px}
.guide li{font-size:14px;line-height:1.55}
.guide li::marker{font-family:var(--font-display);color:var(--accent-h)}
.guide code{font-family:var(--font-mono);font-size:12px;background:#fff;border:1px solid var(--hair);border-radius:4px;padding:1px 5px}
.guide a{color:var(--accent-h);font-weight:600}
/* practice-interview call to action */
.practice-copy{display:block;margin:0 0 14px}
/* backup card: two half-width pills over a full-width restore bar */
.backup-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.backup-row .btn{flex:1 1 0;min-width:200px;border-radius:999px}
.backup-restore{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;margin-top:10px;
font-family:var(--font-display);font-size:14px;line-height:14px;
background:var(--pad-2);color:var(--ink);border:2.5px solid var(--ink);border-radius:var(--radius-sm);
padding:9px 16px;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .12s}
/* oversized glyph, zero line box — the icon can't stretch the button past the pills */
.backup-restore .br-icon{font-size:21px;line-height:0;font-weight:700}
.backup-restore:hover{transform:translate(-1px,-1px);box-shadow:var(--shadow-h);background:#fff}
/* class-week chip: which weeks of the semester a section belongs to */
.wk-chip{font-family:var(--font-mono);font-size:10px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
border:2px solid var(--ink);border-radius:999px;padding:4px 10px;background:var(--yellow-tint);
white-space:nowrap;flex:0 0 auto;align-self:flex-start;box-shadow:var(--shadow-sm)}
@media(max-width:640px){.sec-head .wk-chip{display:none}}
/* danger zone */
.btn.danger{background:var(--coral)}
.btn.danger:hover{background:var(--red-deep)}
/* floating back-to-top */
.totop{position:fixed;right:22px;bottom:22px;z-index:60;width:44px;height:44px;font-size:18px;line-height:1;
border:2.5px solid var(--ink);border-radius:999px;background:var(--yellow);color:var(--ink);cursor:pointer;
box-shadow:var(--shadow);opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .2s,transform .2s}
.totop.show{opacity:1;pointer-events:auto;transform:none}
.totop:hover{transform:translateY(-2px);box-shadow:var(--shadow-h)}
/* worksheet blocks on the home page — , so the whole worksheet folds
away to just its title and description. Open by default; see closedBlocks. */
.ws-block{margin:0 0 14px}
.ws-head{margin:44px 0 20px;border-top:3px dashed var(--hair);padding-top:30px;
cursor:pointer;list-style:none}
.ws-head::-webkit-details-marker{display:none}
.ws-block.is-first .ws-head{border-top:none;padding-top:0;margin-top:24px}
.ws-title{font-family:var(--font-display);font-size:clamp(22px,4vw,32px);line-height:1.05;margin:12px 0 6px;
display:flex;align-items:center;gap:12px}
.ws-chev{flex:none;font-size:.62em;line-height:1;color:var(--muted);transition:transform .18s ease}
.ws-block[open] .ws-chev{transform:rotate(180deg)}
.ws-head:hover .ws-chev{color:var(--ink)}
.ws-sub{font-size:14.5px;color:var(--muted);margin:0;line-height:1.5}
.ws-count{font-family:var(--font-mono);font-size:11px;font-weight:700;white-space:nowrap;margin-left:8px}
/* extras — bonus worksheets, collapsed into a dropdown each */
.ws-fold{margin:14px 0 0;background:var(--surface);border:3px solid var(--ink);
border-radius:var(--radius);box-shadow:var(--shadow)}
.ws-fold.is-first{margin-top:44px}
.wf-head{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;
list-style:none;border-radius:11px}
.wf-head::-webkit-details-marker{display:none}
.wf-head:hover{background:var(--pad-2)}
.wf-badge{flex:none;font-family:var(--font-mono);font-size:9.5px;font-weight:700;letter-spacing:.12em;
padding:4px 8px;background:var(--yellow);border:2px solid var(--ink);border-radius:var(--radius-sm);
transform:rotate(-1.5deg)}
.wf-title{flex:1;min-width:0;font-family:var(--font-display);font-size:clamp(15px,2.4vw,19px);line-height:1.15}
.wf-count{flex:none;font-family:var(--font-mono);font-size:11px;font-weight:700;color:var(--muted)}
.wf-chev{flex:none;font-size:15px;transition:transform .18s ease}
.ws-fold[open] .wf-chev{transform:rotate(180deg)}
.ws-fold[open] .wf-head{border-bottom:3px dashed var(--hair);border-radius:11px 11px 0 0}
.wf-body{padding:6px 16px 16px}
.wf-body .section{box-shadow:var(--shadow-sm)}
/* ----- signed-in identity, sign-in gate, and the instructor's viewing banner -----
The rules below set display on elements that also carry the `hidden`
attribute, and an author rule beats the browser's own [hidden] styling — so
say it here once, or the sign-out pill and banners would never hide. */
[hidden]{display:none !important}
/* identity pill + gate + banners */
.who{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;font-weight:700;
border:2px solid var(--ink);background:var(--surface);border-radius:999px;padding:5px 11px;
box-shadow:var(--shadow-sm);white-space:nowrap}
.who-out{color:var(--accent-h);text-decoration:underline;cursor:pointer}
/* Links styled as buttons — the base classes were written for