:root{--bg:#f5f4ee;--card:#fffefa;--ink:#253a33;--muted:#768078;--line:#e1e5dc;--green:#305b47;--soft:#e8eee4;--gold:#b99a59}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 'Segoe UI',Arial,sans-serif}button,input,select,textarea{font:inherit}button,a,label.upload{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}[hidden]{display:none!important}.sidebar{position:fixed;inset:0 auto 0 0;width:244px;background:#e9ede3;padding:37px 25px;border-right:1px solid #dde3d7;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:700;font-size:27px;letter-spacing:-1px}.brand small{font-size:10px;font-weight:400;display:block;letter-spacing:.5px;line-height:1}.brand-mark{width:43px;height:43px;background:var(--green);color:white;display:grid;place-items:center;border-radius:13px;font-family:Georgia,serif;font-size:33px;padding-bottom:8px}.sidebar-caption{font-size:10px;letter-spacing:1.8px;color:#818b7d;margin:60px 12px 15px}.nav-item{display:flex;gap:13px;align-items:center;border:0;background:none;color:#607362;width:100%;text-align:left;padding:13px 15px;margin:3px 0;border-radius:8px;font-weight:500}.nav-item.active{background:#dce5d5;color:var(--green)}.nav-item span{font-size:20px}.sidebar-note{margin:auto 10px 45px}.small-label{font-size:10px;letter-spacing:1.4px;font-weight:650;color:var(--muted)}.sidebar-note p{font-family:Georgia,serif;font-size:21px;line-height:1.7;color:#65775e}.sidebar-footer{font-size:10px;color:#798771;display:flex;align-items:center;gap:7px}.dot{height:6px;width:6px;background:#7d9b71;border-radius:50%}main{margin-left:244px;max-width:1600px;padding:0 54px 30px}.topbar{height:88px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:9px;letter-spacing:1.6px;color:var(--muted)}.badge{border:1px solid #d8e2d1;background:#edf2e7;color:#507043;border-radius:30px;padding:5px 12px;font-size:10px;letter-spacing:.3px}.page-heading{display:flex;justify-content:space-between;align-items:center;margin:42px 0 30px}.eyebrow{font-size:9px;letter-spacing:1.7px;color:var(--gold);font-weight:650;margin:0 0 9px}h1{font:42px/1.18 Georgia,'Times New Roman',serif;font-weight:400;letter-spacing:-1px;margin:0}h2{font:27px/1.3 Georgia,serif;font-weight:400;margin:15px 0}h3{font-size:15px;font-weight:600;margin:10px 0}.page-heading p:not(.eyebrow){font-size:13px;max-width:580px;margin:12px 0 0;color:var(--muted)}.heading-art{font-size:75px;line-height:1;color:#b2bea4;transform:rotate(15deg);margin-right:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:13px}.welcome{max-width:760px;padding:36px}.welcome p{max-width:590px}.welcome .primary{margin:12px 0}.pill{font-size:9px;letter-spacing:1px;background:var(--soft);color:#52704c;border-radius:5px;padding:5px 9px}.workspace{display:grid;grid-template-columns:minmax(360px,1fr) 274px;gap:24px;align-items:start}.lesson{padding:27px 30px}.lesson-meta{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:11px}.session-state{margin-left:auto}.task-prompt{font-size:18px;line-height:1.7;margin:22px 0 28px}label{display:block;font-size:12px;font-weight:600;margin:15px 0 8px}textarea,input,select{width:100%;border:1px solid #dce0d7;background:white;border-radius:7px;padding:11px 12px;color:var(--ink);outline:none}textarea{resize:vertical;min-height:130px;line-height:1.7}textarea:focus,input:focus,select:focus{border-color:#6b8b6b;box-shadow:0 0 0 3px #e8eee4}button:focus-visible,a:focus-visible{outline:3px solid #9fbf91;outline-offset:3px}.muted{font-size:11px;color:var(--muted);line-height:1.65}.image-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:16px 0}.upload{font-size:11px;cursor:pointer;color:#486643;border:1px dashed #bccbb4;border-radius:6px;padding:7px 10px;margin:0}.text-button{border:0;background:none;color:#526a4c;font-size:12px;padding:8px 0}.primary,.secondary{border-radius:7px;font-size:12px;font-weight:550;padding:12px 17px;display:inline-flex;align-items:center;justify-content:center;gap:25px}.primary{background:var(--green);border:1px solid var(--green);color:white}.primary:hover{background:#244b38}.secondary{border:1px solid #d7dfd1;color:#4c6847;background:#f9fbf5}.secondary:hover{background:#edf2e7}.answer-actions{display:flex;align-items:center;gap:15px;margin:23px 0 7px}.lesson-footer{border-top:1px solid var(--line);padding-top:20px;margin-top:25px;display:flex;align-items:center;justify-content:space-between;gap:12px}.right-column{display:flex;flex-direction:column;gap:17px}.progress-card{padding:22px}.progress-card .small-label{margin-top:0}.progress-number{font:47px/1 Georgia,serif;margin:25px 0 17px}.progress-number span{font-size:23px;color:#9aa48e}.progress-track{height:5px;background:#e9eee4;border-radius:10px;overflow:hidden}.progress-track div{height:100%;width:0;background:#719266;transition:width .3s}hr{border:0;border-top:1px solid var(--line);margin:20px 0}.metric{display:flex;justify-content:space-between;gap:8px;font-size:11px;color:var(--muted);margin:12px 0}.metric strong{font-weight:500;color:var(--ink);max-width:140px;overflow-wrap:anywhere}.guidance{background:#edeedc;border-color:#e2e4cb;padding:20px 22px}.guidance-icon{font-size:22px;color:#9d9e6b}.guidance p{color:#7b8064;font-size:12px;margin-bottom:0}.wide{width:100%}.close-button{font-size:10px;color:#8c8e7a}.limitations{display:flex;gap:12px;margin-top:32px;color:#8a9185;max-width:880px;font-size:10px}.limitations>span{font-size:22px}.limitations strong{font-weight:600}.feedback{padding:14px 16px;margin-top:20px;border-radius:8px;font-size:13px;white-space:pre-wrap}.feedback.correct{background:#edf4e7;color:#46663d}.feedback.incorrect{background:#f6efdf;color:#876d33}.feedback.uncertain{background:#edf0ef;color:#657b77}.hint-panel{padding:15px 17px;background:#f7f5e9;border-left:3px solid #b9a777;margin-top:15px;border-radius:0 7px 7px 0}.hint-panel p{font-size:13px;margin:8px 0 0;white-space:pre-wrap}.notice{padding:14px 18px;background:#fbf0dc;border:1px solid #e9d6ac;color:#846728;border-radius:8px;margin-bottom:20px;font-size:13px}#preview{max-width:100%;max-height:240px;border-radius:8px;margin:10px 0;object-fit:contain}dialog{border:1px solid var(--line);border-radius:15px;padding:30px;width:600px;max-width:calc(100% - 28px);background:var(--card);color:var(--ink);max-height:90vh;overflow:auto}dialog::backdrop{background:#20342d70;backdrop-filter:blur(3px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between}.dialog-heading h2{margin:0}.icon-button{background:none;border:0;font-size:27px;color:var(--muted)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.pilot-settings{background:#f0f2e9;border-radius:9px;padding:13px 17px;margin-top:20px}.pilot-settings label{font-size:10px}.pilot-settings .small-label{margin:0}.dialog-actions{display:flex;justify-content:space-between;gap:15px;margin-top:25px}.form-error{color:#984c3b;font-size:13px;padding:10px 0}.report-item{border-top:1px solid var(--line);padding:15px 0;font-size:12px}.report-item p{margin:4px 0}.report-item h4{margin:0 0 5px;font-size:13px}#reports-panel{margin-top:25px;border-top:1px solid var(--line);padding-top:18px}@media(min-width:1500px){main{padding-left:75px;padding-right:75px}}@media(max-width:1150px){main{padding:0 28px 25px}.sidebar{width:205px;padding:30px 18px}main{margin-left:205px}.workspace{grid-template-columns:minmax(300px,1fr) 235px;gap:17px}.lesson{padding:23px}.answer-actions{align-items:flex-start;flex-direction:column;gap:5px}}@media(max-width:900px){.sidebar{width:80px;padding:25px 15px}.brand>span:last-child,.sidebar-caption,.sidebar-note,.sidebar-footer,.nav-item{display:none}.brand-mark{width:45px}main{margin-left:80px}.workspace{grid-template-columns:1fr}.right-column{display:grid;grid-template-columns:1fr 1fr}.progress-card{grid-row:span 3}.guidance{display:none}.topbar{height:70px}h1{font-size:36px}.heading-art{font-size:55px}.page-heading{margin:30px 0}}@media(max-width:560px){.sidebar{display:none}main{margin-left:0;padding:0 18px 22px}.topbar{font-size:7px;letter-spacing:.8px}.badge{font-size:9px;padding:4px 8px}.eyebrow{font-size:8px;letter-spacing:1px}.heading-art{display:none}h1{font-size:33px}h2{font-size:24px}.lesson,.welcome{padding:21px}.task-prompt{font-size:17px}.right-column{display:flex}.lesson-footer{align-items:stretch;flex-direction:column}.answer-actions .primary{width:100%}.form-grid{grid-template-columns:1fr;gap:0}.dialog-actions{flex-direction:column-reverse}dialog{padding:22px}.progress-number{font-size:38px;margin:17px 0}.progress-card{padding:20px}.limitations{font-size:9px}.welcome .primary{width:100%}}

.top-actions{display:flex;align-items:center;gap:12px}.parent-mobile{display:none}@media(max-width:900px){.parent-mobile{display:block;font-size:10px}}
video { max-width: 100%; max-height: 360px; }
#lesson-choices { display: grid; gap: 10px; }

/* Compact parent-review layout. Keep a readable base size and visible controls. */
body{font-size:14px;line-height:1.45}
.sidebar{width:190px;padding:22px 16px}.brand{font-size:24px}.sidebar-caption{margin:28px 8px 10px}.sidebar-note{display:none}
main{margin-left:190px;padding:0 24px 18px;max-width:1700px}
.topbar{height:44px}.page-heading{margin:14px 0 12px}.page-heading p:not(.eyebrow){margin:5px 0 0}.heading-art{display:none}
h1{font-size:28px}h2{font-size:24px;margin:10px 0}h3{margin:6px 0}.eyebrow{margin-bottom:4px}
.workspace{grid-template-columns:minmax(0,1fr) 248px;gap:16px}.lesson{padding:16px 20px}.lesson-meta{flex-wrap:wrap;gap:8px}
.task-prompt{font-size:17px;line-height:1.5;margin:14px 0 16px;white-space:pre-wrap}
#difficulty-label{display:inline-block;margin:0 0 4px}.pill{padding:3px 7px}
label{margin:8px 0 5px}textarea{min-height:80px;padding:8px 10px;line-height:1.5}
body[data-answer-mode=numeric] #answer{min-height:54px;height:54px}body[data-answer-mode=written] #answer{height:96px}
#answer-shortcuts{display:block;margin-top:3px}.muted{line-height:1.45}.image-row{margin:9px 0;gap:8px}
.primary,.secondary{padding:9px 13px;gap:12px}.answer-actions{margin:10px 0 5px}.lesson-footer{padding-top:10px;margin-top:12px}
.feedback{margin-top:10px;padding:10px 12px}.hint-panel{padding:10px 12px;margin-top:10px}.hint-panel p{margin-top:5px}
.right-column{gap:10px}.progress-card{padding:15px}.progress-number{font-size:36px;margin:13px 0 10px}.progress-number span{font-size:21px}
.metric{margin:8px 0}hr{margin:12px 0}.guidance{display:none}.limitations{margin-top:14px}.notice{padding:9px 12px;margin-bottom:10px}
.pilot-settings{margin-top:12px;padding:10px 13px}dialog{padding:22px}.dialog-actions{margin-top:15px}
.math-fraction{display:inline-grid;grid-template-rows:auto auto;vertical-align:middle;text-align:center;line-height:1.15;margin:0 .16em;font-family:Georgia,'Times New Roman',serif;font-size:1.04em}
.math-fraction .numerator{border-bottom:1px solid currentColor;padding:0 .18em .12em}.math-fraction .denominator{padding:.12em .18em 0}
blockquote{margin:10px 0;padding:9px 12px;border-left:3px solid #9eae93;background:#f0f3eb;font-size:15px;line-height:1.5;white-space:pre-wrap}
#lesson-choices{gap:7px}.secondary.choice-wrong{background:#fce8e6;color:#9f2525;border:2px solid #c74343}.secondary.choice-wrong:hover{background:#f9d8d5}
#completion-dialog{overflow:hidden;text-align:center;max-width:560px}#completion-prize{font-size:21px;color:var(--green);font-weight:650}.completion-content{position:relative;z-index:1}
#confetti{position:absolute;inset:0;pointer-events:none;overflow:hidden}.confetti-piece{position:absolute;left:var(--x);top:-16px;width:8px;height:13px;background:hsl(var(--hue) 75% 55%);animation:confetti-fall 2.8s var(--delay) both}
@keyframes confetti-fall{0%{transform:translateY(-15px) rotate(0);opacity:1}100%{transform:translateY(620px) rotate(650deg);opacity:0}}
@media(prefers-reduced-motion:reduce){.confetti-piece{display:none}.progress-track div{transition:none}}
@media(min-width:1500px){main{padding-left:30px;padding-right:30px}}
@media(max-width:1000px){.sidebar{width:150px;padding:18px 10px}main{margin-left:150px;padding:0 16px 16px}.workspace{grid-template-columns:minmax(0,1fr) 220px}.lesson{padding:14px}.brand{font-size:21px}}
@media(max-width:900px){.sidebar{width:64px;padding:18px 10px}.brand-mark{width:42px}main{margin-left:64px}.workspace{grid-template-columns:1fr}.right-column{display:grid;grid-template-columns:1fr 1fr}.topbar{height:42px}.page-heading{margin:12px 0}.progress-card{grid-row:span 3}}
@media(max-width:560px){.sidebar{display:none}main{margin-left:0;padding:0 10px 14px}.lesson,.welcome{padding:13px}.task-prompt{font-size:16px}.right-column{display:flex}.lesson-footer{flex-direction:row;align-items:center}.page-heading h1{font-size:26px}.topbar{letter-spacing:.3px}.dialog-actions{flex-direction:column-reverse}.math-fraction{font-size:1em}.answer-actions{gap:7px}}
.nav-item{text-decoration:none}
.brand .app-version{align-self:center;margin-left:auto;font-size:11px;color:inherit;white-space:nowrap}
.report-item details{margin-top:10px;overflow-wrap:anywhere}
.report-item summary{cursor:pointer;font-weight:600}
.report-item h5{margin:12px 0 3px;font-size:12px}
/* Authenticated web pilot */
.shell{margin:2.5rem auto;max-width:1100px;padding:0 24px 40px}
.shell>.card{padding:24px;margin:24px 0}
.shell h1{margin-bottom:1rem}
.shell h2{margin-bottom:1rem}
.shell #reports .card{padding:20px;margin-top:18px}
@media(max-width:600px){.shell{margin:1.5rem auto;padding:0 16px 24px}.shell>.card{padding:18px}}
.account-bar{display:flex;gap:1.2rem;align-items:center;flex-wrap:wrap;padding:1rem 5%;background:#fff;border-bottom:1px solid #dbe3e0}
.account-bar a{margin-left:auto}
.account-notice{padding:1rem 5%;margin:0;background:#fff5d8;color:#604414;font-size:.95rem}
.report-json{white-space:pre-wrap;overflow-wrap:anywhere;font-size:.85rem}
#login-form,#student-form{display:grid;gap:1rem;max-width:38rem}
#login-form label,#student-form label{display:grid;gap:.4rem}
#login-form input,#student-form input,#activation-code{box-sizing:border-box;width:100%;padding:.7rem;font:inherit}
#login-form [hidden],#student-form [hidden]{display:none}