:root {
    color-scheme: light;
    --font-ui: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    --ink: #202925;
    --muted: #65706a;
    --paper: #fffdf8;
    --green: #176c56;
    --green-light: #e8f3ed;
    --green-dark: #105541;
    --focus-ring: rgb(23 108 86 / 18%);
    --terracotta: #bd593e;
    --line: #dce3dd;
    --border-input: #9ba79f;
    --error: #9d2c2c;
    --error-bg: #fff0ed;
    --level-a1-fg: #70413f;
    --level-a1-bg: #f3edec;
    --level-a2-fg: #49677a;
    --level-a2-bg: #edf2f5;
    --level-b1-fg: #28717a;
    --level-b1-bg: #eaf3f3;
    --level-b2-fg: #52744c;
    --level-b2-bg: #eef3ec;
    --level-c1-fg: #77712f;
    --level-c1-bg: #f4f2e8;
    --level-c2-fg: #644777;
    --level-c2-bg: #f2eef5;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: #f5f1e8;
    color: var(--ink);
    font: 16px/1.55 var(--font-ui);
}

button, input, select, textarea { font-family: inherit; }

.wrap { width: min(920px, calc(100% - 32px)); margin-inline: auto; }

.site-header {
    padding: 56px 0 42px;
    background: var(--green);
    color: white;
    border-bottom: 6px solid #e9b85e;
}

.eyebrow { margin: 0 0 4px; font-size: .78rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { margin: 0; font: 700 clamp(2.8rem, 8vw, 5rem)/1 var(--font-ui); }
.subtitle { max-width: 640px; margin: 14px 0 0; font-size: 1.3rem; font-weight: 650; opacity: .95; }
.intro { max-width: 580px; margin: 12px 0 0; font-size: 1.08rem; opacity: .9; }
main { padding-block: 38px 70px; }

.global-nav { background: #123f34; color: white; }
.global-nav-inner { display: flex; align-items: center; gap: 28px; min-height: 62px; }
.main-nav { display: flex; flex-wrap: wrap; gap: 18px; margin-right: auto; }
.main-nav a, .nav-languages a, .site-wordmark, .user-settings-link { color: white; font-weight: 700; text-decoration: none; }
.main-nav a:hover, .nav-languages a:hover, .site-wordmark:hover, .user-settings-link:hover { text-decoration: underline; }
.site-wordmark { font-size: 1.2rem; letter-spacing: -.01em; margin-right: 12px; }
.nav-languages { display: flex; gap: 7px; align-items: center; white-space: nowrap; }
.nav-languages [aria-current="page"] { text-decoration: underline; text-decoration-thickness: 3px; }
.lang-switch-sep { opacity: .6; }
.lang-switch { display: inline-block; padding: 4px 2px; letter-spacing: .02em; }
.user-settings-link { display: inline-flex; align-items: center; padding: 4px 2px; }
.user-area { display: inline-flex; align-items: center; margin-left: 4px; }
.user-area-admin { color: white; font-weight: 700; letter-spacing: .02em; padding: 4px 2px; }
.global-footer { padding: 22px 0; background: #123f34; color: rgb(255 255 255 / 82%); font-size: .85rem; text-align: center; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 10px; margin: 0 0 8px; }
.footer-link { color: inherit; }
.footer-sep { opacity: .55; }
.footer-logout-form { display: contents; }
.footer-logout-button { padding: 0; border: none; background: none; font: inherit; color: inherit; cursor: pointer; }
.footer-copyright { margin: 0; opacity: .8; }

.topic-header { padding-top: 24px; }
.verb-table { width: 100%; max-width: 26rem; border-collapse: collapse; margin: 14px 0 16px; font-size: .95rem; }
.verb-table th, .verb-table td { border-bottom: 1px solid var(--line); padding: 6px 10px; text-align: left; font-weight: 400; }
.verb-table caption { text-align: left; font-weight: 700; margin-bottom: 6px; }
.verb-ending { color: var(--error); font-weight: 700; }
.language-switch:not(.nav-languages) { margin-bottom: 24px; text-align: right; }
.language-switch a { color: white; font-weight: 700; }
.language-switch [aria-current="page"] { text-decoration-thickness: 3px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 6px 10px; margin-bottom: 28px; color: var(--muted); }
.breadcrumbs a { color: var(--green); }
.topic-content { max-width: 760px; margin-bottom: 42px; }
.topic-content-section + .topic-content-section { margin-top: 28px; }
.topic-content-section h2, .topic-example-group h2 { margin: 0 0 8px; font: 750 1.25rem/1.3 var(--font-ui); }
.topic-content-section p { margin: 0; }
.topic-content-section p + p { margin-top: 12px; }
.topic-example-group { margin-top: 30px; padding-left: 18px; border-left: 3px solid var(--green); }
.topic-examples { margin: 0; padding-left: 22px; }
.topic-examples li { margin-block: 5px; font-style: italic; }
.overview-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.overview-card { padding: 22px 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); }
.overview-card h2 { margin: 0 0 8px; }
.overview-card h2 a, .card-link { color: var(--green); }
.overview-card p { margin: 0 0 14px; }
.card-link { font-weight: 750; }
.contact-form { display: grid; gap: 18px; max-width: 560px; margin-top: 24px; }
.contact-form-field label { display: block; margin-bottom: 6px; font-weight: 700; }
.contact-form-field input[type="text"], .contact-form-field input[type="email"], .contact-form-field textarea {
    width: 100%; box-sizing: border-box; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
    font: 500 1rem/1.4 var(--font-ui); background: var(--paper); color: var(--ink);
}
.contact-form-field textarea { resize: vertical; min-height: 160px; }
.contact-form-checkbox label { display: flex; align-items: flex-start; gap: 8px; font-weight: 500; }
.contact-form-checkbox input { margin-top: 4px; }
.field-hint { margin: 6px 0 0; font-size: .85rem; color: var(--muted); }
.field-error { margin: 6px 0 0; font-size: .85rem; color: var(--error); font-weight: 700; }
.topic-label-tail { white-space: nowrap; }
.topic-development-status { color: var(--muted); font-size: .72em; font-weight: 600; margin-left: .15em; }
.development-status-summary { color: var(--muted); font-size: .82rem; margin: .65rem 0 1rem; }
.admin-tabs { display: flex; gap: 14px; margin-bottom: 18px; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
.admin-tabs a[aria-current="page"] { font-weight: 700; color: var(--green); }
.admin-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.admin-table th, .admin-table td { border-bottom: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: middle; }
.admin-table form { margin: 0; }
.admin-table button { padding: 4px 9px; font-size: .85rem; }
.staff-time-actions { display: flex; gap: 10px; }
.staff-time-live p { margin: 2px 0; }
.staff-status-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-left: 6px; vertical-align: middle; }
.staff-status-dot--working { background: var(--green); animation: staff-status-pulse 1.6s ease-in-out infinite; }
@keyframes staff-status-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.staff-topic { border-top: 1px solid var(--line); padding-top: 16px; margin-top: 20px; }
.staff-qs-form { margin-top: 28px; }
.staff-qs-review-form fieldset { border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; margin: 0 0 16px; }
.staff-qs-review-form legend { font-weight: 700; padding: 0 6px; }
.staff-qs-review-form textarea { display: block; width: 100%; max-width: 480px; box-sizing: border-box; margin: 6px 0 4px; }
.staff-qs-question { margin: 0 0 12px; }
.staff-qs-question p { margin: 0 0 6px; font-weight: 600; }
.staff-qs-question label { margin-right: 16px; }
.staff-qs-exercise-meta { color: var(--muted); font-size: .82rem; margin: -4px 0 10px; }
.staff-qs-errors { color: var(--error); font-weight: 700; padding-left: 18px; margin: 10px 0; }
.staff-qs-confirmation { color: var(--green); font-weight: 700; }
.staff-ceo-qs { margin-top: 32px; }
.staff-ceo-employee-history { margin-top: 24px; }
.staff-qs-overview-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.staff-qs-overview-item { border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; }
.staff-qs-overview-item p { margin: 2px 0; }
.staff-qs-overview-user { font-size: 1.05rem; }
.staff-qs-count-flagged { color: var(--error); font-weight: 700; }
.staff-qs-detail-section, .staff-qs-flags { border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; margin: 0 0 14px; }
.staff-qs-flags { background: var(--error-bg); }
.staff-qs-answer-no { color: var(--error); font-weight: 700; }
.staff-qs-answer-yes { color: var(--green); font-weight: 700; }
.staff-topic-jump { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 10px 0; }
.staff-topic-nav { display: flex; align-items: center; gap: 14px; margin-top: 16px; font-weight: 700; }
.staff-topic-nav-disabled { color: var(--muted); font-weight: 700; }
.staff-plan-notes { white-space: pre-wrap; font: 500 .9rem/1.4 var(--font-ui); background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin: 4px 0 12px; }
.staff-billing-open-days { list-style: none; padding: 0; margin: 8px 0; }
.staff-billing-open-days li { display: flex; align-items: center; gap: 10px; padding: 4px 0; }
.staff-billing-today { color: var(--muted); font-size: .82rem; }
.staff-marketing-tasks { margin-top: 32px; }
.staff-marketing-filters { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin: 10px 0 18px; }
.staff-marketing-task-list { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 10px; }
.staff-marketing-task-item { border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; }
.staff-marketing-task-item p { margin: 2px 0; }
.staff-marketing-task-title { font-size: 1.02rem; }
.staff-marketing-task-inactive { opacity: .6; }
.staff-marketing-task-form label { display: block; margin: 0 0 12px; font-weight: 600; }
.staff-marketing-task-form input, .staff-marketing-task-form select, .staff-marketing-task-form textarea { display: block; width: 100%; max-width: 480px; box-sizing: border-box; margin: 6px 0 0; font-weight: 400; }
.staff-marketing-task-meta { color: var(--muted); font-size: .82rem; }
.development-topic-status { display: flex; align-items: center; gap: 8px; margin-top: 28px; color: var(--muted); font-size: .82rem; }
.development-topic-status label { font-weight: 700; }
.development-topic-status select { min-width: 54px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); color: var(--ink); font: inherit; }
.development-topic-status button { padding: 7px 10px; border-color: var(--line); background: var(--paper); color: var(--ink); font-size: .82rem; }
.glossary-term { border-bottom: 1px dotted currentColor; cursor: help; position: relative; }
.glossary-term:focus { outline: 1px dotted currentColor; outline-offset: 2px; }
.glossary-popup { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 4px 16px rgb(44 55 48 / 8%); box-sizing: border-box; color: var(--ink); display: none; font-size: .82rem; font-weight: 400; left: 0; line-height: 1.5; overflow-wrap: break-word; padding: 13px 14px; position: absolute; text-decoration: none; top: calc(100% + .35rem); white-space: normal; width: min(26rem, calc(100vw - 2rem)); z-index: 20; }
.glossary-popup strong, .glossary-popup span { display: block; }
.glossary-popup strong { margin-bottom: .3rem; }
.glossary-term:hover > .glossary-popup, .glossary-term:focus > .glossary-popup, .glossary-term.is-open > .glossary-popup { display: block; }
.no-glossary-tooltips .glossary-popup { display: none !important; }
.preview-notice { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 4px 16px rgb(44 55 48 / 8%); box-sizing: border-box; color: var(--ink); max-width: min(28rem, calc(100vw - 2rem)); padding: 22px 24px; }
.preview-notice::backdrop { background: rgb(32 41 37 / 45%); }
.preview-notice-title { font-size: 1.05rem; }
.preview-notice form { margin-top: 6px; text-align: right; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.primary-action, .secondary-action { padding: 11px 16px; border-radius: 8px; font-weight: 750; text-decoration: none; }
.primary-action { background: white; color: var(--green); }
.secondary-action { border: 1px solid rgb(255 255 255 / 65%); color: white; }
.marketing-sections { display: grid; gap: 20px; }
.marta-header-light { background: var(--paper); color: var(--ink); }
.marta-hero { display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }
.marta-photo { width: 220px; height: 220px; border-radius: 16px; object-fit: cover; flex-shrink: 0; }
.marta-hero-text { flex: 1 1 320px; min-width: 260px; }
.marta-preply { margin-top: 20px; }

.home-section { margin-top: 48px; }
.section-title { font-size: 1.6rem; margin: 0 0 18px; }
.section-cta { text-align: center; margin: 18px 0 0; }
.level-grid { display: flex; flex-wrap: wrap; gap: 14px; }
.level-tile { flex: 1 1 130px; padding: 16px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); text-align: center; text-decoration: none; color: var(--ink); }
.level-tile:hover, .level-tile:focus-visible { border-color: var(--green); }
.level-tile-code { display: block; font-size: 1.6rem; font-weight: 800; color: var(--green); }
.level-tile-label { display: block; font-weight: 700; margin-top: 4px; }
.level-tile-text { display: block; font-size: .85rem; color: var(--muted); margin-top: 4px; }
.level-tile-actions { display: flex; justify-content: center; gap: 12px; margin-top: 10px; }
.is-unavailable { opacity: .65; }
.level-tile.is-unavailable, .overview-card.is-unavailable,
.course-index-level.is-unavailable, .course-index-area.is-unavailable,
.course-index-group.is-unavailable, .course-index-topic.is-unavailable,
.course-index-test.is-unavailable { color: var(--muted); }
.level-tile.is-unavailable .level-tile-code { color: var(--muted); }
.expansion-notice { color: var(--muted); font-size: .92rem; margin: 10px 0 0; }
.a1-learning-path-summary { margin: 18px 0; font-weight: 700; }
.a1-learning-path-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.a1-learning-path-item { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); }
.a1-learning-path-item.is-current { border-color: var(--green); }
.a1-learning-path-number { flex: 0 0 auto; min-width: 1.8em; font-weight: 700; color: var(--muted); text-align: right; }
.a1-learning-path-title { flex: 1 1 auto; min-width: 0; font-weight: 650; }
.a1-learning-path-title a { color: var(--green); }
.a1-learning-path-status { flex: 0 0 auto; font-size: .85rem; color: var(--muted); text-align: right; }
.a1-learning-path-item.a1-learning-path-status--completed .a1-learning-path-status { color: var(--green-dark); font-weight: 700; }
.a1-learning-path-item.a1-learning-path-status--in-progress .a1-learning-path-status { color: var(--terracotta); font-weight: 700; }
.a1-learning-path-current-label { margin-left: 6px; font-weight: 700; color: var(--green-dark); }
.settings-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.why-card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.why-icon { display: block; margin-bottom: 10px; color: var(--green); }
.marta-features { display: grid; grid-template-columns: 1fr; gap: 20px; }

@media (min-width: 600px) {
    .marta-features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
    .marta-features { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.course-index-header h1 {
    font-family: inherit;
    font-size: clamp(2.15rem, 6vw, 3.75rem);
    line-height: 1.08;
    letter-spacing: -.025em;
}

.course-index-jumps { display: flex; flex-wrap: wrap; gap: 7px 0; margin: 0 0 42px; font-size: .94rem; font-weight: 750; }
.course-index-jumps a { color: var(--level-color); text-decoration: none; }
.course-index-jumps a:nth-child(1) { color: var(--level-a1-fg); }
.course-index-jumps a:nth-child(2) { color: var(--level-a2-fg); }
.course-index-jumps a:nth-child(3) { color: var(--level-b1-fg); }
.course-index-jumps a:nth-child(4) { color: var(--level-b2-fg); }
.course-index-jumps a:nth-child(5) { color: var(--level-c1-fg); }
.course-index-jumps a:nth-child(6) { color: var(--level-c2-fg); }
.course-index-jumps a:hover, .course-index-jumps a:focus-visible { text-decoration: underline; text-underline-offset: 4px; }
.course-index-jumps a:not(:last-child)::after { content: "·"; margin-inline: 10px; color: #8b918e; }

.course-index-levels { display: grid; gap: 66px; }
.course-index-level { --level-color: var(--level-a1-fg); --level-background: var(--level-a1-bg); scroll-margin-top: 24px; }
.course-index-level#level-a1 { --level-color: var(--level-a1-fg); --level-background: var(--level-a1-bg); }
.course-index-level#level-a2 { --level-color: var(--level-a2-fg); --level-background: var(--level-a2-bg); }
.course-index-level#level-b1 { --level-color: var(--level-b1-fg); --level-background: var(--level-b1-bg); }
.course-index-level#level-b2 { --level-color: var(--level-b2-fg); --level-background: var(--level-b2-bg); }
.course-index-level#level-c1 { --level-color: var(--level-c1-fg); --level-background: var(--level-c1-bg); }
.course-index-level#level-c2 { --level-color: var(--level-c2-fg); --level-background: var(--level-c2-bg); }
.course-index-level > h2 {
    margin: 0 0 27px;
    padding: 12px 16px 13px;
    border-radius: 7px;
    background: var(--level-background);
    color: var(--level-color);
    font-family: inherit;
    font-size: 2.15rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -.025em;
}

.course-index a { color: inherit; text-decoration: none; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.course-index a:hover, .course-index a:focus-visible { color: var(--green); text-decoration: underline; }
.course-index-tree, .course-index-tree ul { margin: 0; padding: 0; list-style: none; }
.course-index-tree { display: grid; grid-template-columns: minmax(0, 1fr); gap: 32px 34px; }
.course-index-tree > li { min-width: 0; break-inside: avoid; }
.course-index-tree > li + li { margin-top: 0; }
.course-index-tree ul { display: block; }
.course-index-tree ul { margin: 11px 0 0 22px; }
.course-index-tree ul ul { margin-left: 24px; }
.course-index-area > a, .course-index-area > span { font-size: 1.16rem; font-weight: 800; }
.course-index-group + .course-index-group { margin-top: 18px; }
.course-index-group > a, .course-index-group > span { font-size: 1.02rem; font-weight: 700; }
.course-index-topic, .course-index-test { margin-top: 6px; line-height: 1.42; color: #303533; }

@media (min-width: 600px) {
    .course-index-tree { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
    .course-index-tree { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 599px) {
    .course-index-tree ul { margin-left: 17px; }
    .course-index-tree ul ul { margin-left: 19px; }
}

.validation, .empty-state {
    margin-bottom: 26px;
    padding: 20px 24px;
    border: 1px solid #e4aaa0;
    border-left: 5px solid var(--error);
    border-radius: 10px;
    background: var(--error-bg);
}

.validation h2, .empty-state h2 { margin: 0 0 5px; font-size: 1.15rem; }
.validation p, .validation ul, .empty-state p { margin-block: 6px; }
.exercise-grid { display: grid; gap: 24px; }

.exercise-reference-back { margin: 0 0 32px; }
.exercise-reference-back a { color: var(--green); font-weight: 700; }
.exercise-type-reference { display: grid; gap: 64px; }
.exercise-type-section { padding-top: 24px; border-top: 3px solid var(--green); }
.exercise-type-heading { margin: 0 0 18px; color: var(--green); font: 750 1.75rem/1.2 var(--font-ui); }
.exercise-type-meta { display: grid; gap: 8px; max-width: 760px; margin: 0 0 32px; }
.exercise-type-meta div { display: grid; grid-template-columns: minmax(8rem, 10rem) minmax(0, 1fr); gap: 8px 16px; }
.exercise-type-meta dt { font-weight: 750; }
.exercise-type-meta dd { min-width: 0; margin: 0; }
.exercise-type-variant + .exercise-type-variant { margin-top: 36px; }
.exercise-variant-heading { margin: 0 0 12px; color: #4f5b55; font: 700 1.1rem/1.35 var(--font-ui); }

.exercise {
    padding: clamp(22px, 5vw, 36px);
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--paper);
    box-shadow: 0 6px 24px rgb(44 55 48 / 7%);
}

.exercise-intro, .exercise-outro { margin: 12px 0; }
.exercise-intro > :first-child, .exercise-outro > :first-child { margin-top: 0; }
.exercise-intro > :last-child, .exercise-outro > :last-child { margin-bottom: 0; }

/* Central, site-wide accent for every exercise-intro (all A1 topics), matching the existing
   .topic-example-group left accent line. */
.exercise-intro {
    padding-left: 18px;
    border-left: 3px solid var(--green);
}

.exercise-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; }
.tags span { padding: 3px 9px; border-radius: 99px; background: var(--green-light); color: var(--green); font-size: .78rem; font-weight: 700; }
.exercise-number { margin: 3px 0; color: var(--muted); font-size: .8rem; white-space: nowrap; }
.exercise h2 { margin: 22px 0 12px; color: #4f5b55; font: 500 1rem/1.45 var(--font-ui); }
.exercise h2.exercise-title { margin: 22px 0 12px; color: var(--ink); font: 700 clamp(1.35rem, 4vw, 1.75rem)/1.3 var(--font-ui); }
.exercise .exercise-title + h2 { margin-top: 0; }
.staff-instruction-text { color: var(--error); }
.exercise h2.staff-instruction-text { color: var(--error); }
.question.staff-instruction-text { color: var(--error); }
.question { margin: 0 0 22px; color: #4f5b55; font: 500 1rem/1.45 var(--font-ui); }
.gap-text-question { font: 500 1rem/1.5 var(--font-ui); }
.gap-text-question--list { color: #4f5b55; }
.gap-text-question--free-sentence { color: var(--ink); font: 650 1.2rem/1.4 var(--font-ui); }
.gap-text-question--free-sentence .gap-input { font-size: 1rem; }
.gap-text-list { display: grid; gap: 12px; }
.gap-text-row { min-width: 0; }
.context-gloss {
    position: relative;
    display: inline;
    background: none;
    border: 0;
    margin: 0;
    padding: 0;
    font: inherit;
    color: inherit;
    cursor: help;
    text-decoration: none;
}
.context-gloss:hover,
.context-gloss:focus-visible {
    text-decoration: underline dotted;
    text-underline-offset: 3px;
}
.context-gloss-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translate(-50%, -6px);
    padding: 4px 9px;
    border-radius: 6px;
    background: var(--ink);
    color: white;
    font: 600 .75rem/1.2 var(--font-ui);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity .15s ease;
    pointer-events: none;
    z-index: 5;
}
.context-gloss:hover .context-gloss-tooltip,
.context-gloss:focus-visible .context-gloss-tooltip,
.context-gloss.is-open .context-gloss-tooltip {
    opacity: 1;
    visibility: visible;
}
fieldset { display: grid; gap: 10px; margin: 0; padding: 0; border: 0; }
.choice { display: flex; gap: 11px; align-items: center; padding: 12px 14px; border: 1px solid var(--line); border-radius: 9px; cursor: pointer; }
.choice:hover { border-color: var(--green); background: #f6faf7; }
.choice:has(input:checked) { border-color: var(--green); background: var(--green-light); }
.choice input { accent-color: var(--green); }
.gap-label { display: block; margin-bottom: 6px; font-weight: 700; }
.gap-input { box-sizing: border-box; padding: 11px 13px; border: 1px solid var(--border-input); border-radius: 8px; background: white; color: inherit; font: inherit; }
.gap-input--short { width: min(100%, 360px); }
.gap-input--sentence { width: 100%; }
.gap-input:focus { outline: 3px solid var(--focus-ring); border-color: var(--green); }
.input-with-aids { position: relative; display: inline-flex; align-items: flex-end; flex-wrap: wrap; gap: 10px 14px; max-width: 100%; vertical-align: middle; }
.input-with-aids--short { width: min(100%, 430px); }
.input-with-aids--sentence { width: min(100%, 48rem); }
.input-with-aids > .gap-input { min-width: 0; }
.input-with-aids--short > .gap-input { flex: 0 1 360px; }
.input-with-aids--sentence > .gap-input { flex: 1 1 30rem; }
.input-aid-buttons { display: inline-flex; flex: 0 0 auto; align-items: flex-end; gap: 8px; margin-left: auto; }
.input-aid-button, .character-button, .character-case-toggle {
    display: inline-grid;
    place-items: center;
    min-width: 34px;
    min-height: 34px;
    padding: 6px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: #fbfdfb;
    color: var(--green);
    font: 750 1rem/1 var(--font-ui);
}
.input-aid-button:hover, .character-button:hover, .character-case-toggle:hover { border-color: var(--green); background: var(--green-light); }
.input-aid-button:focus-visible, .character-button:focus-visible, .character-case-toggle:focus-visible {
    outline: 3px solid var(--focus-ring);
    border-color: var(--green);
}
.original-sentence-button { font-size: 1.12rem; }
.character-toolbox {
    position: absolute;
    z-index: 30;
    top: calc(100% + 7px);
    right: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    width: min(310px, calc(100vw - 48px));
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: white;
    box-shadow: 0 8px 24px rgb(44 55 48 / 16%);
}
.character-toolbox[hidden], .uppercase-characters[hidden] { display: none; }
.uppercase-characters { display: contents; }
.question select, .matching-row select {
    box-sizing: border-box;
    width: 11rem;
    inline-size: 11rem;
    max-width: 100%;
    max-inline-size: 100%;
    padding: .42em 2.15em .42em .7em;
    border: 1px solid var(--border-input);
    border-radius: 8px;
    appearance: none;
    background-color: #fbfdfb;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='none' stroke='%23176c56' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='m1 1 5 5 5-5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right .7em center;
    color: var(--ink);
    font: 650 1rem/1.25 var(--font-ui);
    vertical-align: baseline;
}
.question select { min-width: 0; }
.question select:focus, .matching-row select:focus {
    outline: 3px solid var(--focus-ring);
    border-color: var(--green);
}
.inline-gap-unit {
    display: inline-flex;
    align-items: baseline;
    max-width: 100%;
    white-space: nowrap;
    vertical-align: baseline;
}
.inline-gap-unit > select { flex: 0 1 11rem; width: 11rem; inline-size: 11rem; min-width: 0; max-width: calc(100% - 1em); max-inline-size: calc(100% - 1em); }
#A1-ADJPOS-GAP-001 .inline-gap-unit > select { flex-basis: 15rem; width: 15rem; inline-size: 15rem; }
.inline-gap-unit > .input-with-aids { flex: 1 1 auto; min-width: 0; }
.inline-gap-punctuation { flex: 0 0 auto; align-self: baseline; }
.matching-list { display: grid; gap: 12px; width: fit-content; max-width: 100%; }
.matching-row { display: grid; grid-template-columns: minmax(0, 1fr) 11rem; align-items: baseline; gap: 8px 16px; min-width: 0; }
.matching-row label { min-width: 0; font: 500 1rem/1.5 var(--font-ui); }
.conjugation-table-exercise { width: 100%; max-width: 30rem; border-collapse: collapse; }
.conjugation-table-exercise th, .conjugation-table-exercise td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; }
.conjugation-table-exercise thead th { font: 700 .95rem/1.3 var(--font-ui); }
.conjugation-table-exercise tbody th { font: 500 1rem/1.5 var(--font-ui); }
.conjugation-table-exercise td { width: 100%; }
.conjugation-table-exercise .input-with-aids--short { width: 100%; flex-wrap: nowrap; }
.conjugation-table-exercise .input-with-aids--short > .gap-input { flex: 1 1 auto; min-width: 0; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
button { padding: 10px 16px; border: 1px solid transparent; border-radius: 8px; font: 700 .95rem/1 var(--font-ui); cursor: pointer; }
.check-button { background: var(--green); color: white; }
.check-button:hover { background: var(--green-dark); }
.hint-button, .reset-button, .share-button, .exercise-feedback-button, .memory-sound-toggle, .sequence-reset, .word-order-reset, .audio-choice-next, .alphabet-show-all, .alphabet-close-all, .alphabet-sound-toggle, .flashcards-show-solution { border-color: var(--line); background: transparent; color: var(--ink); }
.share-button { margin-left: auto; }
.exercise-feedback-button { margin-left: auto; }
.exercise-feedback-button + .share-button { margin-left: 0; }
.hint, .feedback, .explanation { margin-top: 18px; padding: 12px 14px; border-radius: 8px; }
.hint { background: #fff4d7; }
.feedback { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.feedback[hidden] { display: none; }
.explanation-toggle { flex: 0 0 auto; padding: 0; border: 0; background: none; color: var(--muted); font: 500 .85rem/1.3 var(--font-ui); text-decoration: underline; cursor: pointer; }
.explanation-toggle:hover, .explanation-toggle:focus-visible { color: var(--ink); }
.feedback-secondary { display: inline-flex; align-items: center; gap: 8px; }
.solution-audio-play { flex: 0 0 auto; padding: 0; border: 0; background: none; color: inherit; font-size: 1rem; line-height: 1; cursor: pointer; }
.feedback.correct { background: var(--green-light); color: var(--green-dark); font-weight: 700; }
.feedback.incorrect { background: var(--error-bg); color: var(--error); font-weight: 700; }
.feedback.unusual { background: #fbeee9; color: var(--terracotta); font-weight: 700; }
.explanation { background: #edf2f7; }
.sequence-list { display: flex; flex-wrap: wrap; gap: 10px; min-height: 52px; padding: 10px; border: 1px dashed var(--border-input); border-radius: 9px; background: #f6faf7; }
.sequence-item { cursor: grab; background: white; border-color: var(--line); color: var(--ink); }
.sequence-item:active { cursor: grabbing; }
.sequence-item--dragging { display: none; }
.sequence-placeholder { flex: 0 0 auto; border: 1px dashed var(--border-input); border-radius: 8px; background: rgba(23, 108, 86, .06); }
.sequence-reset { margin-top: 12px; }
.word-order { display: grid; gap: 10px; }
.word-order-pool, .word-order-target { display: flex; flex-wrap: wrap; gap: 10px; min-height: 52px; padding: 10px; border: 1px dashed var(--border-input); border-radius: 9px; background: #f6faf7; }
.word-order-target { background: white; }
.word-order-tile { cursor: grab; background: white; border-color: var(--line); color: var(--ink); }
.word-order-tile:active { cursor: grabbing; }
.word-order-tile--dragging { display: none; }
.word-order-placeholder { flex: 0 0 auto; border: 1px dashed var(--border-input); border-radius: 8px; background: rgba(23, 108, 86, .06); }
.word-order-reset { margin-top: 12px; }
.categorization { display: grid; gap: 20px; }
.categorization-pool { display: flex; flex-wrap: wrap; gap: 10px; min-height: 52px; padding: 10px; border: 1px dashed var(--border-input); border-radius: 9px; background: #f6faf7; }
.categorization-item { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 9px; background: white; cursor: grab; flex-basis: 100%; }
.categorization-item:active { cursor: grabbing; }
.categorization-item.dragging { opacity: .45; }
.categorization-item-label { font: 700 1.05rem/1.4 var(--font-ui); color: var(--ink); }
.categorization-options { display: flex; flex-wrap: wrap; gap: 6px; }
.categorization-category-items .categorization-options { display: none; }
.categorization-option { display: inline-flex; align-items: center; padding: 5px 11px; border: 1px solid var(--line); border-radius: 999px; background: #fbfdfb; color: var(--muted); font: 500 .8rem/1.2 var(--font-ui); cursor: pointer; }
.categorization-option:nth-child(1) { background: #eaf1f7; }
.categorization-option:nth-child(2) { background: #f7f1e2; }
.categorization-option:nth-child(3) { background: #f2eaf7; }
.categorization-option:nth-child(4) { background: #f3ece1; }
.categorization-option:hover { border-color: var(--green); background: #f6faf7; }
.categorization-option:has(input:checked) { border-color: var(--green); background: var(--green-light); color: var(--green-dark); }
.categorization-option:has(input:focus-visible),
.text-marking-segment:has(input:focus-visible),
.memory-card:focus-visible .memory-card-face,
.alphabet-card:focus-visible .alphabet-card-face { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.categorization-categories { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.categorization-category { padding: 12px 14px; border: 1px solid var(--line); border-radius: 9px; background: var(--paper); }
.categorization-category:nth-child(1) { background: #eaf1f7; }
.categorization-category:nth-child(2) { background: #f7f1e2; }
.categorization-category:nth-child(3) { background: #f2eaf7; }
.categorization-category:nth-child(4) { background: #f3ece1; }
.categorization-category-heading { margin: 0 0 10px; color: var(--ink); font: 700 .95rem/1.3 var(--font-ui); }
.categorization-category-items { display: flex; flex-wrap: wrap; gap: 10px; min-height: 44px; }
.categorization-category.categorization-drop-active, .categorization-pool.categorization-drop-active { border-color: var(--green); background: var(--green-light); }
.text-marking-question { color: #4f5b55; font: 500 1rem/1.6 var(--font-ui); }
.text-marking-list { display: grid; gap: 10px; }
.text-marking-row { min-width: 0; }
.text-marking-segment { display: inline; padding: .05em .2em; border-radius: 4px; cursor: pointer; }
.text-marking-segment:hover { background: #f6faf7; }
.text-marking-segment:has(input:checked) { background: #fff4d7; font-weight: 700; }
.memory-board { margin: 0 0 22px; }
.memory-grid { display: grid; grid-template-columns: repeat(var(--memory-columns, 4), minmax(0, 1fr)); gap: 6px; }
.memory-card { position: relative; min-width: 0; aspect-ratio: 1 / 1; padding: 0; border: 0; border-radius: 6px; background: transparent; cursor: pointer; perspective: 600px; container-type: inline-size; }
.memory-card-face {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    overflow: hidden;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 6px;
    text-align: center;
    font: 650 clamp(.55rem, 17cqi, .95rem)/1.15 var(--font-ui);
    backface-visibility: hidden;
    transition: transform .35s ease;
}
.memory-card-face--back { background: var(--green); border-color: var(--green); color: white; font-size: clamp(.85rem, 30cqi, 1.4rem); transform: rotateY(0deg); }
.memory-card-face--front { background: white; color: var(--ink); transform: rotateY(180deg); overflow-wrap: anywhere; hyphens: auto; }
.memory-card-face--text-long { font-size: clamp(.46rem, 13cqi, .75rem); }
.memory-card-face--text-longer { font-size: clamp(.4rem, 9.5cqi, .6rem); }
.memory-card-face--multiline { line-height: 1.05; }
.memory-card-face--image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; object-position: center; }
.memory-card-face--broken { background: #fdecea; }
.memory-card-face--broken img { display: none; }
.memory-card-face--broken::after { content: "⚠ missing image"; font-size: clamp(.5rem, 13cqi, .75rem); color: #b3261e; }
.memory-card.is-flipped .memory-card-face--back { transform: rotateY(-180deg); }
.memory-card.is-flipped .memory-card-face--front { transform: rotateY(0deg); }
.memory-card.is-matched { cursor: default; }
.memory-card.is-matched .memory-card-face--front { background: white; border-color: var(--green); }
.memory-card.is-matched .memory-card-face--front::after { content: ""; position: absolute; inset: 0; background: color-mix(in srgb, var(--green) 5%, transparent); pointer-events: none; }
.memory-card-audio { position: absolute; right: 3px; bottom: 3px; display: grid; place-items: center; font-size: clamp(.55rem, 16cqi, .8rem); line-height: 1; opacity: .55; }
.memory-card-audio:hover { opacity: .9; }
.memory-card-image-label {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 3px 4px 2px;
    background: linear-gradient(to top, rgba(0, 0, 0, .26), rgba(0, 0, 0, 0));
    color: rgba(255, 255, 255, .9);
    text-shadow: 0 1px 2px rgba(0, 0, 0, .55);
    font: 700 clamp(.48rem, 12.5cqi, .68rem)/1.15 var(--font-ui);
    text-align: center;
    text-transform: lowercase;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
/* Admin-only control, rendered for every memory exercise when isAdmin() is true (see
   includes/exercise-renderer.php and public/app.js "memory-dev-show-all"). */
.memory-dev-show-all { margin: -12px 0 22px; text-align: center; }
.memory-dev-show-all-toggle { font-size: .75rem; padding: 4px 10px; border: 1px dashed var(--line); border-radius: 4px; background: transparent; color: var(--ink); cursor: pointer; }
.memory-dev-show-all-toggle[aria-pressed="true"] { background: var(--green-light); border-color: var(--green); }

.alphabet-board { position: relative; margin: 0 0 22px; }
.alphabet-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(3.2rem, 1fr)); gap: 8px; }
.alphabet-card {
    position: relative;
    min-width: 0;
    aspect-ratio: 1 / 1;
    padding: 0;
    border: 0;
    border-radius: 6px;
    background: transparent;
    cursor: pointer;
    perspective: 500px;
}
.alphabet-card-face {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    overflow: hidden;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 6px;
    text-align: center;
    backface-visibility: hidden;
    transition: transform .35s ease, border-color .2s ease;
}
.alphabet-card-face--front { background: var(--green); border-color: var(--green); color: white; font: 700 1.15rem/1 var(--font-ui); transform: rotateY(0deg); }
.alphabet-card-face--back { background: white; color: var(--ink); transform: rotateY(-180deg); }
.alphabet-card.is-flipped .alphabet-card-face--front { transform: rotateY(180deg); }
.alphabet-card.is-flipped .alphabet-card-face--back { transform: rotateY(0deg); }
.alphabet-card-letter { font: 700 1rem/1 var(--font-ui); }
.alphabet-card-name { font: 600 .65rem/1.1 var(--font-ui); color: var(--muted); }
.alphabet-card.is-active .alphabet-card-face { border-color: var(--green); border-width: 2px; }

.alphabet-detail {
    margin-top: 12px;
    padding: 20px 22px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--green-light);
    display: flex;
    align-items: flex-start;
    gap: 22px;
}
.alphabet-detail[hidden] { display: none; }
.alphabet-detail-letter { flex: 0 0 auto; font: 700 clamp(2.5rem, 7vw, 4.25rem)/1 var(--font-ui); color: var(--green); }
.alphabet-detail-content { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
.alphabet-detail-name-row { display: inline-flex; align-items: center; gap: 8px; }
.alphabet-detail-name { font: 600 1.2rem/1.2 var(--font-ui); color: var(--ink); }
.alphabet-detail-name-audio,
.alphabet-detail-example-audio { display: inline-grid; place-items: center; font-size: .85em; line-height: 1; opacity: .55; cursor: pointer; }
.alphabet-detail-name-audio:hover,
.alphabet-detail-example-audio:hover { opacity: .9; }
.alphabet-detail-name-audio[hidden] { display: none; }
.alphabet-detail-note { margin: 4px 0 0; font: 500 .95rem/1.45 var(--font-ui); color: var(--ink); }
.alphabet-detail-examples-label { margin: 14px 0 0; font: 700 .78rem/1.2 var(--font-ui); text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.alphabet-detail-examples { margin: 6px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 6px 20px; }
.alphabet-detail-examples li { display: inline-flex; align-items: center; gap: 5px; font: 600 1rem/1.3 var(--font-ui); color: var(--ink); }

.audio-choice-progress { margin: 0 0 14px; font: 700 .8rem/1 var(--font-ui); color: var(--muted); }
.audio-choice-rows { display: flex; flex-direction: column; gap: 10px; }
.audio-choice-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 14px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
}
.audio-choice-row.is-solved { border-color: var(--green); background: var(--green-light); }
.audio-choice-play {
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
    background: var(--green);
    color: white;
    font-size: 1.2rem;
}
.audio-choice-play:hover { background: var(--green-dark); }
.audio-choice-options { flex: 1 1 auto; display: flex; flex-wrap: wrap; gap: 8px; min-width: 0; }
.audio-choice-option { background: white; border-color: var(--line); color: var(--ink); }
.audio-choice-option:disabled { cursor: default; opacity: .85; }
.audio-choice-row.is-locked .audio-choice-option { opacity: .75; cursor: not-allowed; }
.audio-choice-option.is-correct { background: var(--green-light); border-color: var(--green); color: var(--green-dark); }
.audio-choice-option.is-incorrect { background: var(--error-bg); border-color: var(--error); color: var(--error); }
.audio-choice-option-word { position: relative; display: inline-block; }
.audio-choice-option-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translate(-50%, -6px);
    padding: 4px 9px;
    border-radius: 6px;
    background: var(--ink);
    color: white;
    font: 600 .75rem/1.2 var(--font-ui);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity .15s ease;
    pointer-events: none;
    z-index: 5;
}
.audio-choice-option-word:hover .audio-choice-option-tooltip,
.audio-choice-option:focus-visible .audio-choice-option-tooltip {
    opacity: 1;
    visibility: visible;
}
.audio-choice-status { flex: 0 0 auto; font-size: 1.2rem; line-height: 1; color: var(--muted); }
.audio-choice-row.is-solved .audio-choice-status { color: var(--green); }
.audio-choice-feedback { flex-basis: 100%; margin: 0; padding: 8px 12px; border-radius: 8px; font-weight: 700; }
.audio-choice-feedback.is-correct { background: var(--green-light); color: var(--green-dark); }
.audio-choice-feedback.is-incorrect { background: var(--error-bg); color: var(--error); }
.audio-choice-explanation { flex-basis: 100%; margin: 0; padding: 10px 12px; border-radius: 8px; background: #edf2f7; }
.audio-choice-next { margin-top: 16px; }

.audio-image-progress { margin: 0 0 14px; font: 700 .8rem/1 var(--font-ui); color: var(--muted); }
.audio-image-rows { display: flex; flex-direction: column; gap: 10px; }
.audio-image-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 14px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
}
.audio-image-row.is-solved { border-color: var(--green); background: var(--green-light); }
.audio-image-play {
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
    background: var(--green);
    color: white;
    font-size: 1.2rem;
}
.audio-image-play:hover { background: var(--green-dark); }
.audio-image-options { flex-basis: 100%; display: grid; grid-template-columns: repeat(auto-fit, minmax(84px, 1fr)); gap: 8px; min-width: 0; }
.audio-image-option { position: relative; display: flex; flex-direction: column; padding: 0; border: 2px solid var(--line); border-radius: 10px; background: white; overflow: hidden; min-width: 0; container-type: inline-size; }
.audio-image-option img { display: block; width: 100%; aspect-ratio: 1 / 1; object-fit: contain; }
.audio-image-option-label { padding: 3px 4px 5px; font: 700 .8rem/1.2 var(--font-ui); color: var(--ink); text-align: center; overflow-wrap: anywhere; }
.audio-image-option:disabled { cursor: default; opacity: .85; }
.audio-image-row.is-locked .audio-image-option { opacity: .75; cursor: not-allowed; }
.audio-image-option.is-correct { border-color: var(--green); background: var(--green-light); }
.audio-image-option.is-incorrect { border-color: var(--error); background: var(--error-bg); }
.audio-image-option--broken { background: #fdecea; }
.audio-image-option--broken img { display: none; }
.audio-image-option--broken::after { content: "⚠ missing image"; position: absolute; inset: 0; display: grid; place-items: center; padding: 4px; text-align: center; font-size: clamp(.55rem, 12cqi, .7rem); color: #b3261e; }
.audio-image-status { flex: 0 0 auto; font-size: 1.2rem; line-height: 1; color: var(--muted); }
.audio-image-row.is-solved .audio-image-status { color: var(--green); }
.audio-image-feedback { flex-basis: 100%; margin: 0; padding: 8px 12px; border-radius: 8px; font-weight: 700; }
.audio-image-feedback.is-correct { background: var(--green-light); color: var(--green-dark); }
.audio-image-feedback.is-incorrect { background: var(--error-bg); color: var(--error); }
.audio-image-explanation { flex-basis: 100%; margin: 0; padding: 10px 12px; border-radius: 8px; background: #edf2f7; }

.flashcards-board { --flashcards-card-width: min(100%, 340px); margin: 0 0 22px; display: flex; flex-direction: column; align-items: center; gap: 16px; }
.flashcards-progress { margin: 0; display: flex; gap: 10px; font: 700 .8rem/1 var(--font-ui); color: var(--muted); }
.flashcards-progress[hidden] { display: none; }
.flashcards-stack { position: relative; width: var(--flashcards-card-width); aspect-ratio: 3 / 2; }
.flashcards-stack[hidden] { display: none; }
.flashcards-stack-shadow {
    position: absolute;
    inset: 0;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: white;
}
.flashcards-stack-shadow--1 { transform: rotate(-2deg) translate(4px, 3px) scale(.99); }
.flashcards-stack-shadow--2 { transform: rotate(2.5deg) translate(-5px, 7px) scale(.98); opacity: .85; }
.flashcards-stack-shadow--3 { transform: rotate(-3.5deg) translate(6px, 8px) scale(.965); opacity: .65; }
.flashcards-stack-shadow--4 { transform: rotate(3deg) translate(-6px, 13px) scale(.95); opacity: .45; }
.flashcards-cards { position: absolute; inset: 0; }
.flashcard { position: absolute; inset: 0; display: none; perspective: 800px; }
.flashcard.is-active { display: block; }
.flashcard-face {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: white;
    text-align: center;
    overflow-wrap: anywhere;
    font: 650 clamp(1.1rem, 4vw, 1.5rem)/1.25 var(--font-ui);
    color: var(--ink);
    backface-visibility: hidden;
    transition: transform .35s ease;
    box-shadow: 0 6px 16px rgba(0, 0, 0, .08);
}
.flashcard-face--front { transform: rotateY(0deg); }
.flashcard-face--back { transform: rotateY(180deg); background: var(--green-light); border-color: var(--green); }
.flashcard.is-flipped .flashcard-face--front { transform: rotateY(-180deg); }
.flashcard.is-flipped .flashcard-face--back { transform: rotateY(0deg); }
.flashcard-audio-play { position: absolute; bottom: 6px; right: 6px; padding: 4px; border: none; background: transparent; color: inherit; opacity: .7; font-size: .85rem; line-height: 1; cursor: pointer; }
.flashcard-audio-play:hover, .flashcard-audio-play:focus-visible { opacity: 1; }

.flashcards-controls { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.flashcards-controls[hidden] { display: none; }
.flashcards-known { border-color: var(--green); color: var(--green-dark); }
.flashcards-known:hover { background: var(--green-light); }
.flashcards-practice-more { border-color: var(--error); color: var(--error); }
.flashcards-practice-more:hover { background: var(--error-bg); }

.flashcards-input-form { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; width: var(--flashcards-card-width); }
.flashcards-input-form[hidden] { display: none; }
.flashcards-input { flex: 1 1 auto; min-width: 0; }
/* The shared "short" input preset (.input-with-aids--short, .input-with-aids > .gap-input above)
   fixes the text field to a 360px flex-basis with flex-grow:0 - right for a short-phrase field
   that shouldn't grow past its own container. Flashcards instead wants its field to fill exactly
   its row's share of the card width (--flashcards-card-width above), so it needs flex-grow
   enabled here; the gap to the ñ button stays the untouched shared .input-with-aids gap. */
.flashcards-input-form .input-with-aids--short > .gap-input { flex: 1 1 auto; min-width: 0; }
.flashcards-check-feedback { margin: 0; padding: 8px 12px; border-radius: 8px; font-weight: 700; }
.flashcards-check-feedback.is-correct { background: var(--green-light); color: var(--green-dark); }
.flashcards-check-feedback.is-incorrect { background: var(--error-bg); color: var(--error); }

.flashcards-audio-toggle { display: inline-flex; align-items: center; gap: 6px; background: transparent; border-color: var(--line); color: var(--muted); }
.flashcards-audio-toggle.is-on { border-color: var(--green); color: var(--green-dark); background: var(--green-light); }
.flashcards-audio-play { display: inline-flex; align-items: center; gap: 6px; background: transparent; border-color: var(--line); color: var(--muted); margin-right: 8px; }

.flashcards-summary { margin: 0; padding: 14px 18px; border-radius: 10px; background: var(--green-light); color: var(--green-dark); font-weight: 700; text-align: center; }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (max-width: 520px) {
    .global-nav-inner { align-items: flex-start; flex-wrap: wrap; gap: 12px 20px; padding-block: 14px; }
    .main-nav { order: 3; width: 100%; gap: 10px 16px; }
    .nav-languages { margin-left: auto; }
    .site-header { padding-block: 38px 30px; }
    .exercise-header { display: block; }
    .exercise-number { margin-top: 10px; }
    .exercise-type-meta div { grid-template-columns: minmax(0, 1fr); gap: 2px; }
    .question > select { max-width: 100%; margin-block: .25em; }
    .question .inline-gap-unit { width: auto; max-width: 100%; margin-block: .25em; }
    .matching-row { grid-template-columns: minmax(0, 1fr); }
    .matching-row select { width: min(11rem, 100%); inline-size: min(11rem, 100%); }
    .input-with-aids--sentence > .gap-input { flex-basis: 100%; }
    .input-with-aids--sentence .input-aid-buttons { margin-top: 2px; }
    .memory-grid { gap: 4px; }
    .memory-card-face { padding: 3px; border-radius: 5px; }
    .alphabet-grid { grid-template-columns: repeat(auto-fill, minmax(2.6rem, 1fr)); gap: 5px; }
    .alphabet-detail { flex-direction: column; gap: 8px; padding: 14px 16px; }
    .alphabet-detail-letter { font-size: 2.4rem; }
    .a1-learning-path-item { flex-wrap: wrap; }
    .a1-learning-path-status { flex: 1 1 100%; text-align: left; }
}