:root {
    color-scheme: light;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #273a36;
    background: #f4f5f1;
}

.module-page { margin: 0; }
.site-header {
    box-sizing: border-box;
    max-width: 1120px;
    height: 88px;
    margin: auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.site-name { color: #273a36; font-size: 17px; font-weight: 700; text-decoration: none; }
.site-name span { font-weight: 400; }
.site-context { color: #66716c; font-size: 13px; }
.site-actions { display: flex; align-items: center; gap: 10px; }
.home-link, .results-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 13px;
    border: 1px solid #cdd7cf;
    border-radius: 999px;
    color: #37594d;
    font-size: 13px;
    font-weight: 650;
    text-decoration: none;
}
.results-link { background: transparent; font-family: inherit; cursor: pointer; }
.home-link:hover, .results-link:hover { border-color: #8da698; background: #edf3ee; }
.module-stage { padding: 0 24px 28px; }

.home-page { margin: 0; }
.home-stage { padding: 28px 24px 64px; }
.activity-menu { box-sizing: border-box; max-width: 1060px; margin: auto; }
.activity-menu__heading { max-width: 650px; margin-bottom: 36px; }
.activity-menu .eyebrow {
    margin: 0 0 10px;
    color: #52675c;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}
.activity-menu h1 {
    margin: 0 0 12px;
    color: #273a36;
    font-size: clamp(36px, 6vw, 58px);
    line-height: 1.08;
    font-weight: 620;
    letter-spacing: -2px;
}
.activity-menu__heading > p:last-child { margin: 0; color: #617069; font-size: 18px; line-height: 1.6; }
.activity-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.activity-card {
    position: relative;
    min-height: 205px;
    padding: 27px 28px;
    display: flex;
    flex-direction: column;
    border: 1px solid #d8dfd8;
    border-radius: 14px;
    background: #fffefa;
    color: #273a36;
    box-shadow: 0 8px 24px #273a3608;
    text-decoration: none;
    transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}
.activity-card:hover { border-color: #8ead9b; box-shadow: 0 13px 32px #273a3614; transform: translateY(-2px); }
.activity-card__format {
    align-self: flex-start;
    margin-bottom: 16px;
    padding: 4px 9px;
    border-radius: 999px;
    background: #eaf2ec;
    color: #426354;
    font-size: 10px;
    font-weight: 750;
    letter-spacing: .8px;
    text-transform: uppercase;
}
.activity-card strong { font: 600 22px/1.3 Georgia, serif; }
.activity-card__description { margin: 9px 0 18px; color: #68746e; font-size: 14px; line-height: 1.55; }
.activity-card__action { margin-top: auto; color: #285d4e; font-size: 13px; font-weight: 700; }
.activity-card__action span { margin-left: 6px; }
.activity-card:focus-visible, .home-link:focus-visible, .results-link:focus-visible { outline: 3px solid #428570; outline-offset: 3px; }

.session-results {
    box-sizing: border-box;
    width: min(520px, calc(100% - 28px));
    max-height: min(760px, calc(100dvh - 28px));
    padding: 0;
    overflow: auto;
    border: 1px solid #cfd9d1;
    border-radius: 16px;
    background: #fffefa;
    color: #273a36;
    box-shadow: 0 24px 70px #17261f4d;
    font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.session-results::backdrop { background: #17261f80; }
.session-results__header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 24px 26px 19px; border-bottom: 1px solid #e0e5df; }
.session-results__eyebrow { margin: 0 0 4px; color: #617069; font-size: 10px; font-weight: 750; letter-spacing: 1.2px; text-transform: uppercase; }
.session-results h2 { margin: 0; font: 600 28px/1.2 Georgia, serif; }
.session-results__close { width: 36px; height: 36px; padding: 0; border: 1px solid #ccd6ce; border-radius: 50%; background: transparent; color: #52675c; font: 25px/1 sans-serif; cursor: pointer; }
.session-results__close:hover { background: #f1f4ef; }
.session-results__message { margin: 0; padding: 20px 26px 4px; color: #617069; }
.session-results__metrics { margin: 0; padding: 17px 26px; }
.session-results__metrics > div, .session-results__breakdown dl > div { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; padding: 7px 0; border-bottom: 1px solid #edf0eb; }
.session-results__metrics dt, .session-results__breakdown dt { color: #52615a; }
.session-results__metrics dd, .session-results__breakdown dd { margin: 0; color: #273a36; font-weight: 700; font-variant-numeric: tabular-nums; }
.session-results__breakdown { margin: 0 26px; padding: 19px 0 8px; border-top: 1px solid #d9e0da; }
.session-results__breakdown h3 { margin: 0 0 7px; color: #52675c; font-size: 11px; letter-spacing: 1.2px; text-transform: uppercase; }
.session-results__breakdown dl { margin: 0; }
.session-results__category-note { margin: 9px 0 0; color: #6b766f; font-size: 12px; }
.session-results__footer { padding: 18px 26px 24px; }
.session-results__reset, .session-results__confirm button { padding: 8px 12px; border: 1px solid #bdc9bf; border-radius: 7px; background: transparent; color: #52675c; font: inherit; font-size: 13px; cursor: pointer; }
.session-results__reset:hover, .session-results__confirm button:hover { background: #f1f4ef; }
.session-results__confirm { padding: 14px; border-radius: 8px; background: #faf2e6; }
.session-results__confirm p { margin: 0 0 11px; color: #68451d; font-weight: 650; }
.session-results__confirm > div { display: flex; flex-wrap: wrap; gap: 8px; }
.session-results__confirm .session-results__erase { border-color: #8a4d41; background: #8a4d41; color: #fff; }
.session-results__confirm .session-results__erase:hover { background: #713c32; }
.session-results :focus-visible { outline: 3px solid #428570; outline-offset: 2px; }

/* The host can set these dimensions when placing the shell within another page. */
.learning-module {
    --module-accent: #285d4e;
    box-sizing: border-box;
    width: 100%;
    max-width: var(--module-width, 900px);
    height: var(--module-height, calc(100vh - 116px));
    height: var(--module-height, calc(100dvh - 116px));
    max-height: 960px;
    margin: auto;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: #fffefa;
    color: #273a36;
    border: 1px solid #dce1d9;
    border-radius: 18px;
    box-shadow: 0 12px 40px #273a3609;
    font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.learning-module * { box-sizing: border-box; }
.learning-module__content {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior-y: contain;
    scrollbar-gutter: stable;
    scrollbar-color: #b6c5bb transparent;
    padding: 48px clamp(24px, 7vw, 76px);
}
.learning-module h1, .learning-module h2, .learning-module h3 { line-height: 1.25; }
.learning-module h1 { max-width: 590px; margin: 18px 0; font-size: clamp(30px, 4.5vw, 44px); font-weight: 600; letter-spacing: -1.4px; }
.learning-module h2 { margin: 12px 0 18px; font-size: 25px; font-weight: 600; letter-spacing: -.5px; }
.learning-module h3 { margin: 0 0 8px; font-size: 17px; font-weight: 650; }
.learning-module p { margin: 0 0 18px; }
.learning-module .eyebrow { color: #52675c; font-size: 11px; line-height: 1.6; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; }
.eyebrow span { padding: 0 10px; color: #9aa79f; }
.learning-module .lesson-intro { color: #617069; font-size: 18px; }
.practice-link { color: var(--module-accent); font-size: 14px; text-underline-offset: 5px; }
.practice-link span { margin-left: 8px; }
.lesson-heading { padding-bottom: 36px; }
.lesson-section { padding: 34px 0 16px; border-top: 1px solid #e4e7df; }
.example { padding: 22px 26px; margin: 24px 0; border-radius: 8px; background: #f3f4ef; }
.learning-module .example-label { margin-bottom: 8px; color: #617069; font-size: 12px; }
.learning-module .example-sentence { margin: 0; font: 22px/1.6 Georgia, serif; }
.repair-option { margin: 28px 0; }
.learning-module .model-sentence { padding-left: 18px; border-left: 2px solid #adc4b5; color: #385649; }
.punctuation { font-weight: 700; }
.lesson-note { margin: 30px 0 18px; color: #56665c; font-size: 14px; }
.lesson-note strong { color: #334c40; }
.practice-card { margin-top: 24px; padding: 28px; border: 1px solid #ceddd1; border-radius: 10px; background: #f0f5ef; scroll-margin-top: 24px; }
.learning-module .practice-sentence { font: 25px/1.6 Georgia, serif; }
.learning-module .practice-hint { margin-bottom: 0; color: #56665c; font-size: 14px; }
.learning-module__response { margin-top: 32px; padding-top: 22px; border-top: 1px solid #dce1d9; background: #fffefa; }
.short-response label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 600; }
.short-response__controls { display: flex; gap: 12px; }
.short-response input { min-width: 0; width: 100%; height: 48px; padding: 12px 14px; border: 1px solid #b8c5bb; border-radius: 7px; background: #fff; color: #273a36; font: inherit; line-height: normal; }
.short-response input::placeholder { color: #6c776f; }
.short-response button { flex-shrink: 0; padding: 10px 22px; border: 1px solid transparent; border-radius: 7px; background: var(--module-accent); color: #fff; font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; }
.short-response button:hover { background: #1c493c; }
.short-response button:disabled { opacity: .55; cursor: default; }
.short-response button span[aria-hidden="true"] { margin-left: 12px; }
.learning-module .response-status { margin: 8px 0 0; color: #617069; font-size: 12px; line-height: 1.5; }
.learning-module :focus-visible, .site-name:focus-visible { outline: 3px solid #428570; outline-offset: 3px; }
.learning-module__content:focus-visible { outline-offset: -4px; }

@media (max-width: 600px) {
    .site-header { height: 64px; padding: 0 18px; }
    .site-name { font-size: 15px; }
    .site-name span, .results-link__session, .home-link__all { display: none; }
    .site-context { display: none; }
    .site-actions { gap: 6px; }
    .home-link { padding: 7px 11px; }
    .results-link { padding: 7px 11px; }
    .home-stage { padding: 22px 14px 40px; }
    .activity-menu__heading { margin-bottom: 26px; }
    .activity-menu h1 { letter-spacing: -1.3px; }
    .activity-grid { grid-template-columns: 1fr; gap: 12px; }
    .activity-card { min-height: 185px; padding: 23px; }
    .module-stage { padding: 0 10px 10px; }
    .learning-module { height: var(--module-height, calc(100vh - 74px)); height: var(--module-height, calc(100dvh - 74px)); border-radius: 12px; }
    .learning-module__content { padding: 28px 22px; }
    .learning-module__response { padding-top: 16px; padding-bottom: env(safe-area-inset-bottom); }
    .short-response__controls { gap: 8px; }
    .short-response button { padding: 10px 16px; }
    .short-response button span[aria-hidden="true"] { display: none; }
    .practice-card { padding: 20px; }
    .session-results__header { padding: 21px 20px 16px; }
    .session-results__message { padding: 17px 20px 2px; }
    .session-results__metrics { padding: 14px 20px; }
    .session-results__breakdown { margin: 0 20px; }
    .session-results__footer { padding: 16px 20px 21px; }
}
@media (max-height: 500px) {
    .site-header { height: 44px; }
    .module-stage { padding-bottom: 6px; }
    .learning-module { height: var(--module-height, calc(100vh - 50px)); height: var(--module-height, calc(100dvh - 50px)); }
}

.learning-module .response-status[data-result] { padding: 12px 14px; border-radius: 7px; font-size: 14px; }
.learning-module .response-status[data-result="correct"] { color: #285d4e; background: #edf5ef; }
.learning-module .response-status[data-result="incorrect"] { color: #795020; background: #faf2e6; }

.practice-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.short-response .secondary-button { background: transparent; color: #52675c; border-color: #b8c5bb; font-weight: 400; }
.short-response .secondary-button:hover { background: #f3f4ef; }
.answer-explanation { margin-top: 16px; padding: 16px; border-left: 3px solid #adc4b5; background: #f3f4ef; }
.learning-module .answer-explanation p:last-child { margin-bottom: 0; }
.learning-module [hidden] { display: none !important; }

/* Keep response controls independent of the scrolling instructional region. */
.learning-module__response {
    flex: 0 0 auto;
    margin-top: 0;
    padding: 18px clamp(24px, 7vw, 76px);
    max-height: 58%;
    overflow-y: auto;
}
.choice-response { border: 0; margin: 0; padding: 0; }
.choice-response legend { margin-bottom: 8px; font-size: 13px; font-weight: 600; }
.choice-options { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.short-response .choice-options button { padding: 9px 6px; }
.example-sentence mark { background: #e2ecce; color: #273a36; border-bottom: 3px solid #285d4e; border-radius: 3px; padding: 0 3px; font-weight: bold; }
.learning-module .target-description { margin: 8px 0 0; font-size: 12px; color: #52675c; }

.learning-module .word-token-stream { line-height: 2.25; }
.word-token {
    min-width: 40px;
    min-height: 42px;
    margin: 2px 0;
    padding: 2px 7px;
    border: 1px solid #c7d1c8;
    border-radius: 6px;
    background: #fffefa;
    color: inherit;
    font: inherit;
    line-height: 1.35;
    cursor: pointer;
    touch-action: auto;
    -webkit-touch-callout: none;
}
.word-token:hover { border-color: #789788; background: #f4f7f2; }
.word-token.is-selected, .word-token.is-dragging { border-color: #285d4e; background: #dfece4; box-shadow: 0 0 0 2px #285d4e33; }
.word-token.is-assigned { border-color: #7b9b8a; background: #edf4ef; font-weight: 650; }
.word-token.is-selected.is-assigned { background: #d8e8dd; }
.word-token:disabled { cursor: default; opacity: .72; }
.word-slot-dragging, .word-slot-dragging * { user-select: none; }

.word-slots { border: 0; margin: 0; padding: 0; }
.word-slots legend { margin-bottom: 2px; font-size: 13px; font-weight: 650; }
.learning-module .word-slots__help { margin: 0 0 12px; color: #617069; font-size: 12px; line-height: 1.45; }
.word-slots__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); gap: 12px; }
.word-slot { min-width: 0; }
.word-slot__label { display: block; margin-bottom: 5px; color: #52675c; font-size: 11px; font-weight: 700; letter-spacing: .7px; text-transform: uppercase; }
.word-slot__controls { display: flex; gap: 5px; }
.short-response .word-slot__target {
    min-width: 0;
    width: 100%;
    min-height: 48px;
    padding: 8px 10px;
    overflow: hidden;
    border: 1px dashed #9daf9f;
    background: #fbfcf8;
    color: #52675c;
    font-size: 15px;
    font-weight: 500;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.short-response .word-slot__target:hover { border-color: #6f8d7b; background: #f3f7f2; color: #273a36; }
.word-slot.is-filled .word-slot__target { border-style: solid; border-color: #7b9b8a; background: #edf4ef; color: #273a36; font-weight: 650; }
.word-slot.is-active .word-slot__target,
.word-slot.is-available .word-slot__target { border-color: #428570; box-shadow: inset 0 0 0 1px #42857033; }
.word-slot__target.is-drag-over { border-style: solid; border-color: #285d4e; background: #dfece4; box-shadow: 0 0 0 3px #285d4e26; }
.word-slot[data-result="correct"] .word-slot__target { border-color: #428570; background: #edf5ef; }
.word-slot[data-result="incorrect"] .word-slot__target { border-color: #bd8d53; background: #faf2e6; }
.short-response .word-slot__clear {
    align-self: center;
    padding: 6px 7px;
    border: 0;
    background: transparent;
    color: #617069;
    font-size: 11px;
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 3px;
}
.short-response .word-slot__clear:hover { background: #f3f4ef; color: #273a36; }
.short-response .word-slots__check { margin-top: 13px; }
@media (max-width: 600px) {
    .learning-module__response { padding: 14px 22px max(14px, env(safe-area-inset-bottom)); }
    .word-slots__grid { grid-template-columns: 1fr; gap: 8px; }
    .word-token { min-width: 42px; min-height: 44px; padding: 3px 7px; }
}
@media (max-height: 500px) {
    .learning-module__response { max-height: 65%; }
}