:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#173a42;background:#f3f7f6;font-size:17px;line-height:1.65}*{box-sizing:border-box}body{margin:0}header,main,footer{max-width:1200px;margin:auto;padding:24px 34px}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #ccdcd8}.brand{display:flex;align-items:center;gap:16px;font-size:27px;font-weight:750;text-decoration:none;color:#174e46}.brand span{font-size:20px}.brand small{display:block;font-size:10px;letter-spacing:2px}h1,h2,h3{line-height:1.25;color:#173a42}h1{font-family:Georgia,serif;font-size:clamp(32px,5vw,54px);font-weight:500;max-width:800px}h2{font-size:25px}h3{font-size:19px}.eyebrow{text-transform:uppercase;font-size:12px;letter-spacing:2px;font-weight:700;color:#526d69}.pill{border:1px solid #9dbdb3;border-radius:30px;padding:5px 12px;font-size:12px;background:#e8f1ed}.intro{max-width:740px;color:#4e6267}.cards,.layout{display:grid;grid-template-columns:1fr 1fr;gap:24px}.card{background:white;border:1px solid #cbded6;border-radius:16px;padding:28px;margin:20px 0}.accent{border-top:5px solid #337665}.mock{border-top:5px solid #886442}.muted{color:#51666b;font-size:14px}.toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:20px 0}button,input{font:inherit}button{cursor:pointer;border:1px solid #587b74;border-radius:8px;padding:10px 18px;background:#fff;color:#214d44;line-height:1.35}button.primary{background:#205f50;color:#fff;border-color:#205f50}button:disabled{opacity:.65;cursor:default}button:focus-visible,input:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #a36822;outline-offset:4px}.option{display:block;width:100%;text-align:left;margin:12px 0;padding:18px;background:white}.selected{border:2px solid #205f50;background:#e7f0eb}.question{font-size:21px;line-height:1.6}.question-nav{display:flex;gap:8px;flex-wrap:wrap}.question-nav button[aria-current=true]{background:#205f50;color:white}input{max-width:100%;padding:12px;border:1px solid #587b74;border-radius:8px}label{display:block;margin-bottom:8px}.feedback{border-top:4px solid #558277;background:#eef6f1}.incorrect{border-top-color:#9b5f2d;background:#fbf4e9}.feedback p,.feedback li{font-size:16px}.timer{margin-left:auto;font-variant-numeric:tabular-nums}.layout{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:start}.layout>.card{margin-top:0}.answer-entry{display:flex;gap:12px;flex-wrap:wrap}.result-grid{display:flex;gap:32px}.result-grid strong{display:block;font-size:34px}.error{color:#8b2f22}.callout{border-left:4px solid #947440;padding:14px 20px;background:#faf4e7;font-size:15px}footer{border-top:1px solid #ccdcd8;color:#566d70;font-size:12px}#notice{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);background:#183f38;color:white;border-radius:8px;padding:8px 16px;max-width:90%;display:none}.calc{max-width:370px}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:12px 0}.calc input{width:100%;text-align:right}.history{display:flex;justify-content:space-between;gap:16px;align-items:center;border-top:1px solid #dae5e0;padding:16px 0}.lesson-title{margin-top:26px}@media(max-width:800px){.cards,.layout{grid-template-columns:1fr}header,main,footer{padding:20px}h1{font-size:36px}.card{padding:22px}.brand small{letter-spacing:1px}.question{font-size:19px}.pill{font-size:11px}.history{flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

.measurement{margin:20px 0}.measurement img{width:100%;height:auto;display:block;background:#fff;border:1px solid #cbded6;border-radius:8px}.measurement figcaption{font-size:12px;color:#51666b;margin-top:8px}

.issue{margin-top:24px;border-top:1px solid #cbded6;padding-top:16px}.issue select,.issue textarea{font:inherit;width:100%;max-width:100%;padding:10px;border:1px solid #587b74;border-radius:6px;margin-bottom:16px}.issue label{margin-top:12px}.issue textarea:focus-visible,.issue select:focus-visible{outline:3px solid #a36822;outline-offset:3px}

.question-index{margin:20px 0;border:1px solid #cbded6;border-radius:10px;padding:12px 16px;background:#fff}.question-index summary{cursor:pointer;font-weight:600}.question-index .question-nav{padding-top:16px}.feedback h4{font-size:17px;margin:22px 0 6px}.feedback h4+p{margin-top:6px}

.choices{border:0;padding:0;margin:0;min-width:0}.choices legend{font-size:14px;font-weight:650;margin-bottom:6px}.choices .option{display:grid;grid-template-columns:20px 24px minmax(0,1fr);align-items:start;gap:12px;cursor:pointer;border:1px solid #8ba89c;border-radius:10px;line-height:1.5}.choices .option input{width:18px;height:18px;padding:0;margin:4px 0 0;accent-color:#205f50}.choices .option-letter{font-weight:750;color:#205f50}.choices .option:has(input:checked){border:2px solid #205f50;padding:17px;background:#e7f0eb}.choices .option:focus-within{outline:3px solid #a36822;outline-offset:3px}.choices:disabled .option{cursor:default}.choices button{margin-top:8px}

.choices button.option{grid-template-columns:24px minmax(0,1fr);text-align:left}.choices .saved-choice{grid-column:2;font-size:13px;font-weight:650}.choices button.option.selected{background:#e7f0eb;border:2px solid #205f50;padding:17px}

/* Completed-attempt review remains readable at narrow widths. */
table{width:100%;border-collapse:collapse;font-size:15px}th,td{text-align:left;padding:10px 8px;border-bottom:1px solid #d5e3dd}th{font-weight:650}th:first-child,td:first-child{padding-left:0}td:not(:first-child){font-variant-numeric:tabular-nums;white-space:nowrap}a{overflow-wrap:anywhere}@media(max-width:480px){table{font-size:13px}th,td{padding:8px 4px}.card{padding:18px}.result-grid{gap:20px}}
/* Saved answers remain fully legible although further activation is locked. */
.choices button.option:disabled{opacity:1;cursor:default}

/* Complete course catalogue: visible modes, compact cards and mobile reading order. */
.course-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:28px 0}.course-stats>div{padding:18px 22px;background:#edf4ef;border-radius:12px}.course-stats strong{display:block;font-size:32px;color:#205f50}.course-stats span{font-size:14px}.course-link{color:#205f50;display:inline-flex;align-items:center;min-height:44px;padding:8px 14px;border:1px solid #9fb7ac;border-radius:8px;font-weight:650;text-decoration:none}.course-section{margin:44px 0;scroll-margin-top:24px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.section-heading h2{margin:6px 0}.section-heading .eyebrow{margin:0}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px}.form-card{margin:0;padding:24px}.form-card h3{margin:0 0 12px;font-size:22px}.form-card p{margin:8px 0}.form-card button{margin-top:12px}.orientation summary,.developer-checks summary{cursor:pointer;font-weight:650;min-height:32px}.orientation{margin-top:22px}.developer-checks{margin-top:36px}.course-stats>div,.form-card{min-width:0}@media(max-width:600px){.course-stats{gap:8px}.course-stats>div{padding:12px 10px}.course-stats strong{font-size:26px}.course-stats span{font-size:12px}.form-grid{grid-template-columns:1fr}.section-heading{align-items:flex-start;flex-direction:column}.course-link{font-size:14px}.form-card button{width:100%}}

.skip-link{position:absolute;left:-9999px;top:8px;z-index:999;background:#fff;padding:12px}.skip-link:focus{left:8px}#notice{max-width:min(560px,90vw)}.connection-error{border-left:4px solid #ad461f;padding:18px;background:#fff4ed}.pending-answer{font-weight:600;color:#8b3c16}button:disabled{cursor:not-allowed} .revision-pager{display:flex;align-items:center;gap:16px;flex-wrap:wrap}

.brand{white-space:nowrap}.brand>span{white-space:normal;min-width:0}@media(max-width:480px){.brand{gap:10px}.brand>span{font-size:17px}.brand small{font-size:8px;letter-spacing:1.3px}header>.pill{flex-shrink:0;margin-left:10px}}

/* Persistent progression controls, separate from the long teaching panel. */
#app:has(.attempt-nav){padding-bottom:150px}
body:has(.attempt-nav){padding-bottom:100px}
html:has(.attempt-nav){scroll-padding-bottom:150px}
.attempt-nav{position:fixed;z-index:100;left:0;right:0;bottom:0;background:#fff;border-top:2px solid #b6cdc3;box-shadow:0 -4px 20px #173a4214;padding:14px 24px max(14px,env(safe-area-inset-bottom))}
.attempt-nav-inner{max-width:1132px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px}
.attempt-progress{margin:0;font-size:14px;line-height:1.45}.attempt-progress strong,.attempt-progress span{display:block}.attempt-progress span{color:#526d69;font-size:13px}
.attempt-nav-actions{display:flex;gap:12px;align-items:center}.attempt-nav button{min-height:52px}.attempt-nav #next{min-width:220px;font-size:18px;font-weight:750;padding:14px 24px;box-shadow:0 3px 8px #205f5026}.attempt-nav #next:hover{background:#164d40}.attempt-nav #next span{margin-left:8px}
body:has(.attempt-nav) #notice{bottom:116px;z-index:110;pointer-events:none}
#finish-panel{scroll-margin-block:30px 150px}
@media(max-width:600px){.attempt-nav{padding:10px 16px max(12px,env(safe-area-inset-bottom))}.attempt-nav-inner{display:block}.attempt-progress{display:flex;justify-content:space-between;gap:8px;margin-bottom:8px;font-size:13px}.attempt-progress span{font-size:12px}.attempt-nav-actions{gap:10px}.attempt-nav #previous{padding:12px}.attempt-nav #next{flex:1;min-width:0;font-size:16px;padding:12px 10px}.attempt-nav-actions{width:100%}body:has(.attempt-nav) #notice{bottom:126px}}

.primary-link{background:#205f50;color:white}.upgrade-card{border-top:4px solid #b38a4e;background:#fffaf0}.upgrade-card button{font-size:18px;font-weight:700;min-height:52px}.locked-form{background:#f8faf9}.form-card>.pill{display:inline-block;margin-bottom:14px}.study-step{padding:10px 0 22px;border-bottom:1px solid #d5e3dd}.study-step:last-of-type{border-bottom:0}.study-plan h3{margin-bottom:8px}@media(max-width:600px){.upgrade-card button{width:100%;font-size:16px}}

.free-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.free-card{display:flex;flex-direction:column}.free-card button{margin-top:auto;min-height:52px;font-weight:700}#free-tests{scroll-margin-top:24px}#free-tests h3{font-size:26px}@media(max-width:650px){.free-grid{grid-template-columns:1fr}.free-card button{width:100%}}

/* Audit correction: obvious continuation at feedback and at every scroll position. */
.feedback-actions{display:flex;align-items:center;flex-wrap:wrap;gap:16px;margin:18px 0 24px}
.feedback-actions .primary{font-size:18px;font-weight:750;min-height:52px;padding:14px 24px}
.feedback-actions a{color:#174f43;text-decoration:underline;text-underline-offset:3px}
.answer-feedback:focus,.question:focus,#answer-state:focus{outline:3px solid #114e42;outline-offset:5px}
#feedback-loading{padding:16px;border:1px solid #b6cdc3;border-radius:8px;margin:16px 0}
#teaching-panel{scroll-margin-block:24px 160px}
.study-step{padding-bottom:24px}.study-step button{margin:6px 8px 6px 0;min-height:48px}
.topic-table{overflow:auto;max-width:100%}
@media(max-width:600px){.feedback-actions{display:grid;grid-template-columns:1fr}.feedback-actions .primary{width:100%}.study-step button{width:100%}.attempt-nav #next{background:#174f43;color:#fff}.answer-entry{flex-wrap:wrap}.answer-entry input{min-width:0;max-width:100%}}