:root{--forest:#173e36;--ink:#233b33;--muted:#6c776d;--paper:#f7f8f2;--sage:#e8eddf;--lime:#dfedaf;--line:#e3e7dc;--white:#fff;--orange:#bc6237;--shadow:0 12px 40px #143e3610}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer;color:inherit}a{color:inherit;text-decoration:none}button{border:0;background:none}button:disabled{cursor:default;opacity:.5}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #bf803f;outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.17}h1{font:400 clamp(34px,3.25vw,46px)/1.13 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@media(min-width:1450px){main{padding-top:40px}.climb-card{min-height:270px}.climb-card h2{font-size:41px;max-width:350px}.stair-art{width:270px;height:270px}.hero-row{grid-template-columns:minmax(0,1fr) 270px}.home-columns{grid-template-columns:minmax(0,1fr) 320px}}
@media(max-width:1100px){.app-shell{grid-template-columns:205px minmax(0,1fr)}.sidebar{padding-left:16px;padding-right:16px}.app-header{padding:0 28px}main{padding:28px}.app-footer{padding:24px 28px}.hero-row{grid-template-columns:minmax(0,1fr) 200px;gap:16px}.climb-card{padding:25px}.climb-card h2{font-size:31px;max-width:230px}.stair-art{width:185px;height:185px;right:-28px;opacity:.7}.home-columns{grid-template-columns:minmax(0,1fr) 240px;gap:20px}.question-preview{padding:20px}.lesson-grid{grid-template-columns:minmax(0,1fr) 235px;gap:18px}.problem-body,.solution-card{padding:20px}.notes-panel{padding:17px}}
@media(max-width:900px){.app-shell{display:block}.sidebar{display:none}.app-header{height:76px}.mobile-brand{display:flex;align-items:center;gap:9px;font:600 24px/1 Georgia,serif;letter-spacing:-.8px}.mobile-brand img{border-radius:8px}.desktop-context{display:none}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;z-index:30;background:#fafbf7ee;backdrop-filter:blur(15px);border-top:1px solid #dfe5d7;padding:9px 8px calc(9px + env(safe-area-inset-bottom));}.bottom-nav .nav-link{display:flex;flex-direction:column;gap:4px;justify-content:center;align-items:center;padding:5px 4px;min-height:45px;border-radius:9px;font-size:9px;background:none}.bottom-nav .nav-link.active{color:var(--forest)}.bottom-nav .nav-link.active svg{stroke-width:2.3}.bottom-nav .nav-link.active:after{content:"";position:absolute;bottom:calc(6px + env(safe-area-inset-bottom));width:4px;height:4px;border-radius:50%;background:var(--forest)}.bottom-nav .nav-dot{display:none}.app-footer{padding-bottom:105px}.toast{bottom:95px}.hero-row{grid-template-columns:minmax(0,1fr) 210px}.stair-art{right:-5px;width:210px;height:210px}.home-columns{grid-template-columns:minmax(0,1fr) 250px}.lesson-grid{grid-template-columns:minmax(0,1fr) 250px}.notes-panel textarea{min-height:190px}}
@media(max-width:640px){.app-header{height:68px;padding:0 20px}.header-actions{gap:10px}.preview-tag{font-size:8px;letter-spacing:1px}.icon-button{width:35px;height:35px}main{padding:24px 20px 10px}.page-title{margin-bottom:22px;align-items:flex-start}.page-title h1{font-size:34px}.date-pill{font-size:10px;padding-top:5px}.page-title .eyebrow{font-size:8px}.page-title p:last-child{font-size:12px}.hero-row{display:block;margin-bottom:27px}.climb-card{padding:25px 23px;min-height:236px;border-radius:17px}.climb-card h2{font-size:34px;max-width:240px;margin:14px 0 23px}.stair-art{width:184px;height:184px;right:-20px;bottom:-14px;opacity:.85}.climb-card .button{font-size:11px;padding:11px 14px;min-height:42px}.progress-card{margin-top:13px;border-radius:13px;display:grid;grid-template-columns:48px 1fr;gap:0 13px;align-items:center;text-align:left;padding:14px 17px}.progress-card .eyebrow{grid-column:2;margin:0;font-size:8px}.progress-ring{width:46px;height:46px;padding:4px;grid-column:1;grid-row:1/4;margin:0}.progress-ring>div{width:38px;height:38px}.progress-ring strong{font-size:18px}.progress-ring small{display:none}.progress-card>strong{grid-column:2;font-size:12px}.progress-card>p{grid-column:2;margin:1px 0 0;font-size:10px}.home-columns{display:flex;flex-direction:column;gap:26px}.section-head h2{font-size:18px}.section-head .text-link{font-size:10px}.question-preview{padding:21px;border-radius:14px}.question-preview h3{font-size:25px}.tag-row{margin-bottom:15px}.question-preview p{font-size:12px}.preview-bottom{margin-top:17px;padding-top:15px}.home-books{display:grid;grid-template-columns:1fr 1fr;gap:12px}.book-mini{width:100%;text-align:left;display:flex;flex-direction:column;align-items:flex-start;padding:16px;gap:14px;background:#eef1e6;margin:0}.book-mini:last-child{background:#edf1f3}.book-mini img{width:72px;align-self:center;transform:rotate(-3deg)}.book-mini h3{font-size:12px}.book-mini p{font-size:10px;margin-bottom:6px}.book-mini .tag{font-size:8px;padding:3px 5px}.callout{margin-top:19px;padding:15px;align-items:flex-start;gap:11px}.callout p{font-size:10px}.callout svg{width:18px}.app-footer{padding:22px 20px 100px;display:block;font-size:9px}.app-footer button{display:block;margin-top:5px;font-size:9px}.book-library{gap:19px;grid-template-columns:1fr}.book-stage{height:240px}.book-stage img{height:200px}.library-content{padding:23px}.library-content h2{font-size:28px}.toolbar{gap:9px;flex-wrap:wrap}.search-wrap{flex-basis:100%}.round-select{max-width:none;width:100%;min-height:43px}.practice-meta{font-size:10px;align-items:flex-start}.practice-grid{grid-template-columns:1fr}.availability-panel{padding:24px}.availability-panel h3{font-size:23px}.page-intro{font-size:12px}.lesson-grid{display:flex;flex-direction:column}.lesson-grid>div,.lesson-aside{width:100%}.lesson-heading h1{font-size:33px}.lesson-heading .eyebrow{font-size:8px}.question-top{margin-bottom:22px}.lesson-heading .lesson-meta{font-size:11px}.save-button{font-size:10px;padding:8px 10px}.problem-text{font-size:15px;line-height:1.85}.problem-card-header{padding:15px 19px;font-size:9px}.problem-body,.solution-card{padding:21px 19px}.answer span{padding:11px;gap:9px}.answer-actions{gap:9px}.answer-actions .button{font-size:11px;padding:12px}.hint-button{font-size:11px;padding:9px}.notes-panel{padding:21px}.notes-panel textarea{min-height:180px}.notes-panel p{font-size:12px}.notes-panel label{font-size:12px}.notes-status{font-size:11px}.phone-note{font-size:11px}.app-banner{padding:15px;gap:10px}.app-banner p{font-size:11px}.app-banner .text-link{font-size:10px}.note-card{padding:21px}.note-card footer span{font-size:10px}dialog{padding:22px}.dialog-top{margin-bottom:12px}.tabs button{padding:8px 16px}}
@media(max-width:359px){main{padding-left:15px;padding-right:15px}.app-header{padding:0 15px}.mobile-brand{font-size:22px}.date-pill{display:none}.preview-tag{display:none}.climb-card h2{font-size:31px}.stair-art{right:-44px;opacity:.55}.home-books{gap:9px}.book-mini{padding:13px}.tag{font-size:8px}.problem-body,.solution-card{padding:18px 16px}.answer-actions{align-items:stretch;flex-direction:column}.answer-actions .hint-button{align-self:center}.app-banner{align-items:flex-start;flex-direction:column}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

@media(max-width:359px){.problem-card-header span:last-child{display:none}}

/* Family sample check: a separate, self-reported QA record. */
.test-return{display:block;background:var(--sage);padding:12px 28px;color:var(--forest);font-size:13px;font-weight:600;text-align:center}.test-return[hidden]{display:none}.sample-test{max-width:820px;margin:auto;word-break:keep-all;overflow-wrap:anywhere}.sample-test>h1{font-family:inherit;font-size:clamp(26px,4vw,39px);font-weight:650;line-height:1.4;letter-spacing:-1.2px;margin:10px 0 14px}.test-intro{color:var(--muted);font-size:15px;line-height:1.8}.test-scope{padding:20px 22px;border-left:3px solid #90a76f;background:var(--sage);border-radius:0 12px 12px 0;margin:24px 0}.test-scope p{font-size:13px;line-height:1.8;margin-top:6px}.test-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0 12px}.test-actions .button{white-space:normal;min-height:48px;text-align:center;justify-content:center}.test-help{font-size:13px;color:var(--muted);line-height:1.8}.test-panel{background:white;border:1px solid var(--line);border-radius:18px;padding:28px;margin-top:28px}.test-section-heading{margin-bottom:23px}.test-section-heading h2{font-size:22px;line-height:1.5;margin:8px 0}.test-section-heading>p{font-size:12px;color:var(--muted)}.test-device{display:flex;align-items:center;gap:16px;font-size:14px}.test-device select{min-width:0;max-width:100%;border:1px solid var(--line);border-radius:9px;background:var(--paper);padding:10px 12px;color:var(--ink)}.test-list{margin-top:22px}.test-item{border:0;border-top:1px solid var(--line);margin:24px 0 0;padding:18px 0 0;min-width:0}.test-item legend{font-size:16px;font-weight:650;padding-right:16px;line-height:1.8}.test-item legend>span{font-weight:400;color:var(--muted);font-size:12px;margin-right:12px}.test-item p{font-size:14px;line-height:1.85;color:var(--muted);margin-bottom:13px}.test-choices{display:flex;gap:8px;flex-wrap:wrap}.test-choices label{position:relative;cursor:pointer}.test-choices input{position:absolute;opacity:0;width:1px;height:1px}.test-choices span{display:flex;align-items:center;justify-content:center;min-height:44px;font-size:13px;border:1px solid var(--line);border-radius:8px;padding:9px 14px;background:white}.test-choices input:checked+span{background:var(--forest);border-color:var(--forest);color:white}.test-choices input[value=issue]:checked+span{background:#934320;border-color:#934320}.test-choices input:focus-visible+span{outline:3px solid #bf803f;outline-offset:3px}.test-panel>label{font-size:13px;font-weight:600}.test-panel textarea{display:block;resize:vertical;width:100%;max-width:100%;min-height:150px;border:1px solid var(--line);border-radius:10px;padding:14px;background:var(--paper);font-size:16px;line-height:1.7;color:var(--ink);margin:10px 0}.app-footer{gap:12px;flex-wrap:wrap}.app-footer>a{font-size:12px;text-decoration:underline;text-underline-offset:3px}
@media(max-width:640px){.test-return{padding:11px 18px;font-size:12px}.test-panel{padding:20px 16px;border-radius:14px}.test-scope{padding:17px 16px}.test-actions{display:grid;grid-template-columns:1fr}.test-actions .button{width:100%;font-size:14px}.test-device{align-items:flex-start;flex-direction:column;gap:7px}.test-device select{width:100%;font-size:16px}.test-choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.test-choices span{padding:10px 7px}.test-item legend{font-size:15px}.test-section-heading h2{font-size:20px}.test-intro{font-size:14px}.app-footer>a{display:inline-block;margin-bottom:8px}}