:root{--navy:#142d50;--gold:#d9b65d;--ink:#17263c;--muted:#5d6c7c;--bg:#f5f7fb;--blue:#2363a5;--line:#dde4ee;--ido:#2363a5;--wedo:#287c72;--youdo:#b56a2e;--hots:#7658a6;--exit:#a64f81}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.55 system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--ink)}
a{color:inherit}button,input,select{font:inherit}button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #f1bf34;outline-offset:2px}
header{background:var(--navy);color:#fff}
nav{max-width:1320px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:18px 22px;gap:15px;flex-wrap:wrap}
.brand{font-weight:800;letter-spacing:.02em;font-size:1.12rem;text-decoration:none}.brand span{color:var(--gold)}
.navlinks{display:flex;gap:20px;flex-wrap:wrap}.navlinks a{text-decoration:none;font-size:.9rem}.navlinks a:hover,.navlinks a[aria-current]{text-decoration:underline}
.studio-hero{background:var(--navy);color:#fff;padding:26px 22px 40px}
.hero-inner{max-width:1320px;margin:auto}
.eyebrow{color:var(--gold);font-weight:800;font-size:.8rem;letter-spacing:.13em;text-transform:uppercase}
.studio-hero h1{font-size:clamp(1.9rem,4vw,2.8rem);margin:10px 0 6px;line-height:1.1}
.studio-hero p{max-width:780px;color:#e5ebf3;margin:0}
.btn{display:inline-block;border:0;background:var(--gold);color:var(--navy);border-radius:9px;padding:10px 16px;font-weight:800;text-decoration:none}
.btn.outline{border:1px solid #cbd6e3;background:#fff;color:var(--navy)}
.btn.small{padding:6px 11px;font-size:.84rem;border-radius:7px}

.studio{max-width:1320px;margin:-18px auto 0;padding:0 22px 70px;display:grid;grid-template-columns:270px 1fr;gap:22px;align-items:start}
.sidebar{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;position:sticky;top:12px;max-height:calc(100vh - 24px);overflow:auto}
.subject-switch{display:grid;grid-template-columns:1fr 1fr;background:#eaf1fb;border-radius:10px;padding:4px;gap:4px;margin-bottom:10px}
.subject-switch button{border:0;background:transparent;border-radius:7px;padding:8px;font-weight:800;color:var(--navy)}
.subject-switch button[aria-selected=true]{background:var(--navy);color:#fff}
#lessonSearch{width:100%;padding:9px 11px;border:1px solid #b8c7d8;border-radius:8px;margin-bottom:8px}
.unit-label{font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:14px 6px 4px}
.lesson-link{display:block;width:100%;text-align:left;border:0;background:none;padding:8px 10px;border-radius:8px;color:var(--ink);font-size:.93rem}
.lesson-link small{display:block;color:var(--muted);font-size:.76rem}
.lesson-link:hover{background:#f0f4fa}
.lesson-link[aria-current=true]{background:#eaf1fb;box-shadow:inset 4px 0 0 var(--blue);font-weight:700}

.toolbar{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:18px}
.seg{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.seg-label{font-size:.74rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-right:4px}
.seg button{border:1px solid #cbd6e3;background:#fff;border-radius:99px;padding:5px 12px;font-size:.86rem;color:var(--navy)}
.seg button[aria-pressed=true]{background:var(--navy);border-color:var(--navy);color:#fff}
.print-actions{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.print-actions .btn{padding:7px 12px;font-size:.86rem}

.lesson-head{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;margin-bottom:16px}
.lesson-head h2{margin:4px 0 6px;font-size:1.8rem}
.tag{display:inline-block;background:#eaf1fb;color:#244d7a;padding:3px 9px;border-radius:99px;font-size:.75rem;font-weight:700;margin:0 6px 6px 0}
.objective{font-size:1.08rem;font-weight:600;margin:6px 0 12px}
.head-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.head-grid h4{margin:0 0 4px;font-size:.78rem;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}
.head-grid ul{margin:0;padding-left:18px;font-size:.93rem}
dl.vocab{margin:0;font-size:.93rem}dl.vocab dt{font-weight:700}dl.vocab dd{margin:0 0 6px;color:var(--muted)}

.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:-1px;position:relative;z-index:1}
.tabs button{border:1px solid var(--line);border-bottom:0;background:#eef2f8;border-radius:11px 11px 0 0;padding:10px 16px;font-weight:800;color:var(--muted);display:flex;flex-direction:column;align-items:flex-start;line-height:1.15}
.tabs button small{font-weight:600;font-size:.72rem}
.tabs button[aria-selected=true]{background:#fff;color:var(--c,var(--navy));box-shadow:inset 0 4px 0 var(--c,var(--navy))}
.tab-ido{--c:var(--ido)}.tab-wedo{--c:var(--wedo)}.tab-youdo{--c:var(--youdo)}.tab-hots{--c:var(--hots)}.tab-exit{--c:var(--exit)}
.panel{background:#fff;border:1px solid var(--line);border-radius:0 14px 14px 14px;padding:22px}
.phase{border-top:5px solid var(--c,var(--navy));}
.phase-title{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin:0 0 4px}
.phase-title h3{margin:0;font-size:1.35rem;color:var(--c)}
.phase-title span{color:var(--muted);font-size:.9rem}
.teacher-note{background:#fff8e6;border-left:4px solid var(--gold);padding:10px 14px;border-radius:6px;margin:12px 0;font-size:.92rem}
.teacher-note b{color:#765715}
.prompt{font-size:1.08rem;font-weight:650;background:#f5f7fb;border-radius:10px;padding:12px 14px;margin:12px 0;white-space:pre-line}

.passage{background:#fbfcfe;border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:12px 0}
.passage h4{margin:0 0 8px;font-size:1.1rem}
.passage p{margin:0 0 10px;white-space:pre-line}
.passage details summary{cursor:pointer;font-weight:700;color:var(--blue)}
.passage .p-num{color:var(--muted);font-size:.75rem;font-weight:700;margin-right:6px;user-select:none}

ol.steps{list-style:none;padding:0;margin:12px 0;counter-reset:s}
ol.steps li{counter-increment:s;border:1px solid var(--line);border-radius:10px;padding:12px 14px 12px 52px;margin-bottom:10px;position:relative}
ol.steps li::before{content:counter(s);position:absolute;left:12px;top:12px;width:28px;height:28px;border-radius:50%;background:var(--ido);color:#fff;font-weight:800;display:grid;place-items:center;font-size:.9rem}
ol.steps li b{display:block}
.think{font-style:italic;color:#2c3e55;white-space:pre-line}
.step-hidden{display:none}

.q{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:12px;break-inside:avoid}
.q-top{display:flex;gap:10px;align-items:flex-start}
.q-num{flex:0 0 auto;min-width:30px;height:30px;padding:0 6px;border-radius:8px;background:var(--c,var(--navy));color:#fff;font-weight:800;display:grid;place-items:center;font-size:.9rem}
.q-text{flex:1;white-space:pre-line;font-weight:550}
.dok{flex:0 0 auto;font-size:.7rem;font-weight:800;padding:3px 8px;border-radius:99px;background:#eef2f8;color:var(--navy);white-space:nowrap}
.dok.d3,.dok.d4{background:#efe8fa;color:#55398a}
.frame{margin:8px 0 0 40px;font-size:.92rem;color:#244d7a;background:#eaf1fb;border-radius:8px;padding:6px 10px}
.frame::before{content:"💬 ";}
.q-actions{margin:10px 0 0 40px;display:flex;gap:6px;flex-wrap:wrap}
.hint{margin:8px 0 0 40px;background:#eef8f6;border-left:4px solid var(--wedo);padding:7px 11px;border-radius:6px;font-size:.92rem}
.hint b{color:var(--wedo)}
.answer{margin:8px 0 0 40px;background:#f1f8ee;border-left:4px solid #3c8a3f;padding:7px 11px;border-radius:6px;font-size:.93rem;white-space:pre-line}
.answer b{color:#2e6e31}
.write-lines{display:none}

.tier{border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:16px;border-top:5px solid var(--tc)}
.tier.approaching{--tc:#3c8a3f}.tier.onLevel{--tc:var(--blue)}.tier.advanced{--tc:#7658a6}
.tier h4{margin:0 0 6px;color:var(--tc);font-size:1.1rem}
.tier .q{--c:var(--tc)}
.supports{font-size:.88rem;color:var(--muted);margin:0 0 12px;padding-left:18px}
.legend{display:flex;gap:10px;flex-wrap:wrap;font-size:.85rem;color:var(--muted);margin:6px 0 12px}
.legend b{color:var(--ink)}

.misc{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px;margin-top:10px}
.misc div{border:1px dashed #d7b9c9;border-radius:10px;padding:12px;font-size:.92rem}
.misc b{display:block;color:var(--exit)}
.pager{display:flex;justify-content:space-between;margin-top:18px;gap:10px}

.empty-state{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px;text-align:center;color:var(--muted)}
footer{background:var(--navy);color:#e5ebf3;padding:30px 22px;text-align:center;font-size:.88rem}

/* Teacher vs class visibility */
body.mode-class .teacher-only{display:none!important}
body.mode-teacher .class-only{display:none!important}
body.mode-class main{font-size:1.14rem}
body.mode-class .q-text,body.mode-class .prompt{font-size:1.2rem}
body.mode-class .passage{font-size:1.15rem;line-height:1.7}

@media(max-width:900px){.studio{grid-template-columns:1fr}.sidebar{position:static;max-height:none}.print-actions{margin-left:0}}

/* Print: render every phase of the current lesson */
@media print{
  header,footer,.studio-hero,.sidebar,.toolbar,.tabs,.q-actions,.pager,.class-only{display:none!important}
  body{background:#fff;font-size:12pt}
  .studio{display:block;padding:0;margin:0;max-width:none}
  .panel,.lesson-head,.passage,.q,.tier{border-color:#999;box-shadow:none;border-radius:6px}
  .panel{display:block!important;margin-bottom:14px;page-break-before:auto}
  .tab-panel[hidden]{display:block!important}
  .step-hidden{display:block!important}
  .tier.filtered{display:none}
  body.print-scholar .teacher-only,body.print-scholar .answer,body.print-scholar .hint,body.print-scholar .think,body.print-scholar .misc-section,body.print-scholar .model-answer{display:none!important}
  body.print-scholar .write-lines{display:block;margin:8px 0 0 40px;height:62px;background:repeating-linear-gradient(transparent 0 28px,#bbb 28px 29px)}
  body.print-key .answer,body.print-key .hint,body.print-key .teacher-only{display:block!important}
  body.print-key .write-lines{display:none}
  .q,.tier,.passage{break-inside:avoid}
}

/* Class view: progressive reveal of steps, hints, and answers */
body.mode-class .reveal:not(.shown){display:none}
@media print{
  body.mode-class ol.steps li.reveal{display:block!important}
  body.print-key .reveal{display:block!important}
}