/* =====================================================================
   Module group page (/Sub-Module/{id}) and the library, which shows the
   same exercise cards. Everything is scoped under .lesson-page so these
   styles cannot leak into other pages (this file is imported globally by
   app.css). Look and tokens follow ModuleSelection and Progress.

   Hover: every :hover sits inside @media (hover: hover) and (pointer: fine)
   at the end of this file (see CLAUDE.md); touch gets :active instead.
   ===================================================================== */

/* ===== Tokens ===== */
.lesson-page {
    --ink: #1a1a1a;
    --ink-soft: #4a4f57;
    --ink-muted: #8a8f98;
    --line: #eceef3;
    --surface: #f7f8fa;
    --brand: #4d7cfe;
    --brand-soft: #f3f6ff;
    --brand-line: #c9d6ff;
    --done: #92cd4d;
    --done-ink: #5d8f22;
    --done-soft: #f4faec;
    --active: #f5c518;
    --active-ink: #8a6500;
    --active-soft: #fef9e7;
    --wrong: #d93639;
    --wrong-soft: #fff4f4;
    --page-max: 1040px;
    --page-margin-top: 20px;
    --card-radius: 20px;
    --card-pad-y: 20px;
    --card-pad-x: 22px;
    --card-gap: 18px;
    --ring-size: 96px;
    --ring-width: 7px;
    --ring-font: 17px;
    --pill-pad: 0.25rem 0.75rem;
    --hero-title-font: 24px;
    --title-font: 19px;
    --body-font: 15px;
    --label-col: 180px;
    --icon-tile: 48px;
    font-family: 'Montserrat', sans-serif;
    color: var(--ink);
    max-width: var(--page-max);
    margin: var(--page-margin-top) auto 0;
    padding: 0 1rem 40px;
    display: flex;
    flex-direction: column;
    gap: var(--card-gap);
    text-align: left;
    user-select: none;
    -webkit-text-size-adjust: 100%;
}

    .lesson-page *,
    .lesson-page *::before,
    .lesson-page *::after {
        box-sizing: border-box;
    }

/* ===== Buttons: the same pills as NavigationButtons ===== */
.lesson-page .ls-btn {
    --btn-color: var(--brand);
    --btn-ink: var(--brand);
    --btn-fill-ink: #fff;
    appearance: none;
    -webkit-appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 160px;
    height: 46px;
    padding: 0 28px;
    font-family: 'Montserrat', sans-serif;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.3px;
    white-space: nowrap;
    color: var(--btn-ink);
    background: #fff;
    border: 2px solid var(--btn-color);
    border-radius: 23px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

    /* Secondary buttons (show all words, admin fix): a size smaller */
    .lesson-page .ls-btn.is-sm {
        min-width: 0;
        height: 38px;
        padding: 0 20px;
        font-size: 14px;
        border-radius: 19px;
    }

    .lesson-page .ls-btn.is-primary {
        --btn-color: #4d7cfe;
        --btn-ink: #4d7cfe;
    }

    .lesson-page .ls-btn.is-done {
        --btn-color: #92cd4d;
        --btn-ink: var(--done-ink);
    }

    .lesson-page .ls-btn.is-premium {
        --btn-color: #edc829;
        --btn-ink: var(--active-ink);
        --btn-fill-ink: #1a1a1a;
    }

    .lesson-page .ls-btn.is-danger {
        --btn-color: var(--wrong);
        --btn-ink: var(--wrong);
    }

    .lesson-page .ls-btn:active:not(:disabled) {
        transform: translateY(0) scale(0.98);
        background: var(--btn-color);
        color: var(--btn-fill-ink);
    }

    .lesson-page .ls-btn:focus-visible {
        outline: 2px solid var(--btn-color);
        outline-offset: 2px;
    }

    .lesson-page .ls-btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
    }

/* ===== Cards (shared by the header and every exercise) ===== */
.lesson-hero,
.lesson-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--card-radius);
    box-shadow: 0 1px 2px rgba(20, 30, 60, 0.04), 0 4px 14px rgba(20, 30, 60, 0.05);
    min-width: 0;
}

/* ===== Header: progress ring + group title ===== */
.lesson-hero {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: var(--card-pad-y) var(--card-pad-x);
}

.lesson-hero-text {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1 1 auto;
    min-width: 0;
}

.lesson-hero-eyebrow {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: 0.02em;
    color: var(--ink-muted);
    overflow-wrap: anywhere;
}

.lesson-hero-title {
    margin: 0;
    font-size: var(--hero-title-font);
    line-height: 1.25;
    font-weight: 600;
    color: var(--ink);
    overflow-wrap: anywhere;
}

.lesson-hero-desc {
    margin: 0;
    font-size: var(--body-font);
    line-height: 1.5;
    color: var(--ink-soft);
    overflow-wrap: anywhere;
}

.lesson-hero-detail {
    margin: 2px 0 0;
    font-size: var(--body-font);
    line-height: 1.5;
    color: var(--ink-soft);
}

    .lesson-hero-detail strong {
        color: var(--ink);
        font-weight: 600;
    }

/* Ring: the same ring and colours as the module-selection page */
.lesson-ring {
    --ring-color: #4d7cfe;
    --ring-track: #e8eeff;
    --ring-inner: calc(var(--ring-size) - 2 * var(--ring-width));
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: var(--ring-size);
    height: var(--ring-size);
    border-radius: 50%;
    background: conic-gradient(var(--ring-color) calc(var(--progress) * 3.6deg), var(--ring-track) 0deg 360deg);
}

    .lesson-ring.is-done {
        --ring-color: #92cd4d;
        --ring-track: #e0f7e9;
    }

    .lesson-ring.is-active {
        --ring-color: #f5c518;
        --ring-track: #fef9e7;
    }

    .lesson-ring::after {
        content: "";
        position: absolute;
        width: var(--ring-inner);
        height: var(--ring-inner);
        border-radius: 50%;
        background: #fff;
    }

.lesson-ring-value {
    position: relative;
    z-index: 1;
    padding: var(--pill-pad);
    font-size: var(--ring-font);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    color: #fff;
    background-color: var(--ring-color);
    border-radius: 999px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* ===== Exercise list ===== */
.lesson-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--card-gap);
}

    .lesson-list > li {
        list-style: none;
        min-width: 0;
    }

.lesson-card {
    --state-ink: var(--ink-muted);
    --state-soft: #f1f2f5;
    --tile-bg: #c9cdd4;
    overflow: hidden;
    scroll-margin-top: 90px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

    .lesson-card.is-done {
        --state-ink: var(--done-ink);
        --state-soft: var(--done-soft);
        --tile-bg: #92cd4d;
    }

    .lesson-card.is-active {
        --state-ink: var(--active-ink);
        --state-soft: var(--active-soft);
        --tile-bg: #edc829;
    }

    .lesson-card.is-next,
    .lesson-card.is-summary {
        --state-ink: var(--brand);
        --state-soft: var(--brand-soft);
        --tile-bg: #4d7cfe;
    }

    /* The card to work on now stands out, like the current lesson in the module list */
    .lesson-card.is-active,
    .lesson-card.is-next {
        border-color: var(--brand-line);
        box-shadow: 0 1px 2px rgba(77, 124, 254, 0.08), 0 6px 18px rgba(77, 124, 254, 0.12);
    }

    .lesson-card.is-locked > *,
    .lesson-card.is-summary-locked > * {
        opacity: 0.55;
    }

.lesson-card-head {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px 16px;
    padding: var(--card-pad-y) var(--card-pad-x);
}

.lesson-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--icon-tile);
    height: var(--icon-tile);
    border-radius: 14px;
    background: var(--tile-bg);
    flex-shrink: 0;
}

    .lesson-icon img {
        width: 58%;
        height: 58%;
        object-fit: contain;
        display: block;
    }

.lesson-titles {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.lesson-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px 10px;
    min-width: 0;
}

.lesson-type {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: 0.02em;
    color: var(--ink-muted);
}

.lesson-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 2px 10px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.5;
    white-space: nowrap;
    color: var(--state-ink);
    background: var(--state-soft);
    border-radius: 999px;
}

    .lesson-status::before {
        content: "";
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: currentColor;
    }

.lesson-card.is-locked .lesson-status::before,
.lesson-card.is-summary-locked .lesson-status::before {
    width: 10px;
    height: 10px;
    border-radius: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%238a8f98'%3E%3Cpath d='M18 8h-1V6c0-2.76-2.24-5-5-5S7 3.24 7 6v2H6c-1.1 0-2 .9-2 2v10c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V10c0-1.1-.9-2-2-2zm-6 9c-1.1 0-2-.9-2-2s.9-2 2-2 2 .9 2 2-.9 2-2 2zM9 8V6c0-1.66 1.34-3 3-3s3 1.34 3 3v2H9z'/%3E%3C/svg%3E") no-repeat center / contain;
}

.lesson-title {
    margin: 0;
    font-size: var(--title-font);
    line-height: 1.3;
    font-weight: 600;
    color: var(--ink);
    overflow-wrap: anywhere;
}

.lesson-action {
    display: flex;
    justify-content: flex-end;
    min-width: 0;
}

    /* Locked cards have no action: don't leave an empty grid row on phones */
    .lesson-action:not(:has(*)) {
        display: none;
    }

/* ===== Collapsed-card digest and toggle: phones only (see ≤ 640px) ===== */
.lesson-summary,
.lesson-toggle {
    display: none;
}

.lesson-summary-items {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px 8px;
    min-width: 0;
}

.lesson-page .ls-score-mini {
    --mini-fill: #4d7cfe;
    --mini-ink: #3a6aee;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 2px 10px 2px 8px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1.5;
    font-variant-numeric: tabular-nums;
    color: var(--mini-ink);
    background: #f5f6f9;
    border-radius: 999px;
}

    .lesson-page .ls-score-mini.is-great {
        --mini-fill: #74b23a;
        --mini-ink: #4f7f1c;
    }

    .lesson-page .ls-score-mini.is-fair {
        --mini-fill: #e6ae00;
        --mini-ink: #8a6500;
    }

    .lesson-page .ls-score-mini.is-low {
        --mini-fill: #e5484d;
        --mini-ink: #c9282d;
    }

.ls-score-mini-track {
    width: 40px;
    height: 6px;
    border-radius: 999px;
    background: #e3e6ec;
    overflow: hidden;
}

.ls-score-mini-fill {
    display: block;
    height: 100%;
    width: var(--score);
    min-width: 4px;
    border-radius: inherit;
    background: var(--mini-fill);
}

.lesson-toggle {
    appearance: none;
    -webkit-appearance: none;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 40px;
    padding: 0 16px;
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 600;
    color: var(--brand);
    background: none;
    border: 0;
    border-top: 1px solid var(--line);
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.15s ease;
}

    .lesson-toggle:active {
        background-color: var(--brand-soft);
    }

    .lesson-toggle:focus-visible {
        outline: 2px solid var(--brand);
        outline-offset: -2px;
    }

.lesson-toggle-chevron {
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s ease;
}

.lesson-card.is-expanded .lesson-toggle-chevron {
    margin-top: 4px;
    transform: rotate(-135deg);
}

/* Nothing to open: picture and questionnaire cards have no details */
.lesson-card:not(:has(.lesson-body .section)) .lesson-toggle {
    display: none !important;
}

/* The type icons are white line art: the tile carries the state colour, as the
   card headers used to (green done, yellow in progress, blue next/summary). */
/* ===== Card body: one row per detail (label left, content right) ===== */
.lesson-body {
    border-top: 1px solid var(--line);
    padding: 0 var(--card-pad-x);
}

    /* Picture and questionnaire cards have no details to show */
    .lesson-body:not(:has(.section)) {
        display: none;
    }

.lesson-page .lesson-body .section {
    display: grid;
    grid-template-columns: var(--label-col) minmax(0, 1fr);
    align-items: start;
    gap: 8px 24px;
    padding: 16px 0;
    min-width: 0;
}

    .lesson-page .lesson-body .section + .section {
        border-top: 1px solid var(--line);
    }

.lesson-page .lesson-body .section-header {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    padding-top: 2px;
}

.lesson-page .lesson-body .header-title {
    margin: 0;
    font-size: var(--body-font);
    font-weight: 600;
    line-height: 1.35;
    color: var(--ink-soft);
}

.lesson-page .lesson-body .subtext {
    font-size: 13px;
    line-height: 1.4;
    color: var(--ink-muted);
}

.lesson-page .lesson-body .content {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 12px;
    min-width: 0;
    min-height: 26px;
    font-size: var(--body-font);
    line-height: 1.5;
    color: var(--ink-soft);
    overflow-wrap: anywhere;
}

    .lesson-page .lesson-body .content > p,
    .lesson-page .lesson-body .content > span:not(.ls-chip) {
        margin: 0;
        font-size: var(--body-font);
        line-height: 1.55;
        color: var(--ink-soft);
    }

.lesson-page .lesson-body .completion-content .content > p {
    color: var(--ink);
    user-select: text;
}

.lesson-page .lesson-body .completion-content .content > span {
    color: var(--ink-muted);
}

/* Loading placeholder */
.lesson-page .skeleton-line {
    margin: 0;
    font-size: 14px;
    color: var(--ink-muted);
    animation: lesson-pulse 1.4s ease-in-out infinite;
}

@keyframes lesson-pulse {
    0%, 100% {
        opacity: 1;
    }

    50% {
        opacity: 0.45;
    }
}

/* ===== Status chips (sent / checked / waiting) ===== */
.lesson-page .ls-chip {
    --chip-ink: #6b7078;
    --chip-bg: #f1f2f5;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 4px 12px;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
    white-space: nowrap;
    color: var(--chip-ink);
    background: var(--chip-bg);
    border-radius: 999px;
}

    .lesson-page .ls-chip::before {
        content: "";
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background: currentColor;
    }

    .lesson-page .ls-chip.is-ok {
        --chip-ink: var(--done-ink);
        --chip-bg: var(--done-soft);
    }

    .lesson-page .ls-chip.is-wait {
        --chip-ink: var(--active-ink);
        --chip-bg: var(--active-soft);
    }

    .lesson-page .ls-chip.is-bad {
        --chip-ink: var(--wrong);
        --chip-bg: var(--wrong-soft);
    }

    .lesson-page .ls-chip.is-sm {
        gap: 5px;
        padding: 2px 10px;
        font-size: 13px;
    }

        .lesson-page .ls-chip.is-sm::before {
            width: 6px;
            height: 6px;
        }

/* ===== Mistakes ===== */
.lesson-page .mistakes-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr));
    gap: 10px;
    width: 100%;
    min-width: 0;
}

.lesson-page .no-mistakes {
    grid-column: 1 / -1;
    margin: 0;
    font-size: var(--body-font);
    color: var(--ink-muted);
}

.lesson-page .mistake-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
    padding: 12px 14px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.45;
    user-select: text;
}

.lesson-page .mistake-question {
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--ink);
    overflow-wrap: anywhere;
}

.lesson-page .mistake-user-answer,
.lesson-page .mistake-correct-answer {
    margin: 0;
    padding: 6px 10px;
    font-size: 14px;
    line-height: 1.4;
    border-radius: 10px;
    overflow-wrap: anywhere;
}

.lesson-page .mistake-user-answer {
    color: var(--wrong);
    background: var(--wrong-soft);
}

.lesson-page .mistake-correct-answer {
    color: var(--done-ink);
    background: var(--done-soft);
}

.lesson-page .mistake-label {
    display: block;
    margin-bottom: 1px;
    font-size: 12px;
    font-weight: 600;
    opacity: 0.85;
}

/* Image questions: the "view image" icon becomes a proper touch target */
.lesson-page .mistake-question-content .image-icon-btn {
    min-width: 32px;
    min-height: 32px;
    border-radius: 8px;
    background: var(--brand-soft);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.lesson-page .mistake-question-content .image-icon {
    width: 16px;
    height: 16px;
}

/* ===== Pyramid: words that needed repeating ===== */
.lesson-page .pyramid-content .words-list {
    width: 100%;
    min-width: 0;
}

    .lesson-page .pyramid-content .words-list ul {
        list-style: none;
        margin: 0;
        padding: 0;
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr));
        gap: 10px;
        counter-reset: repeat-counter;
    }

    .lesson-page .pyramid-content .words-list li {
        position: relative;
        display: flex;
        flex-direction: column;
        gap: 2px;
        min-width: 0;
        padding: 10px 12px 10px 44px;
        background: var(--surface);
        border: 1px solid var(--line);
        border-radius: 14px;
        counter-increment: repeat-counter;
    }

        .lesson-page .pyramid-content .words-list li::before {
            content: counter(repeat-counter);
            position: absolute;
            top: 10px;
            left: 12px;
            width: 22px;
            height: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 700;
            color: var(--wrong);
            background: var(--wrong-soft);
            border-radius: 50%;
        }

.lesson-page .mistake-word {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.35;
    color: var(--ink);
    overflow-wrap: anywhere;
}

.lesson-page .mistake-translation {
    margin: 0;
    font-size: 14px;
    line-height: 1.4;
    color: var(--ink-muted);
    overflow-wrap: anywhere;
}

/* ===== New words ===== */
.lesson-page .words-content .words-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
    width: 100%;
    min-width: 0;
}

    .lesson-page .words-content .words-list ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .lesson-page .words-content .words-list li {
        display: flex;
        flex-wrap: wrap;
        align-items: baseline;
        gap: 2px 6px;
        padding: 7px 0;
        font-size: var(--body-font);
        line-height: 1.4;
        color: var(--ink);
        border-bottom: 1px solid var(--line);
        overflow-wrap: anywhere;
    }

.lesson-page .words-content .translation {
    font-size: 14px;
    color: var(--done-ink);
}

.lesson-page .words-content .show-all-words-btn {
    margin-top: 4px;
}

/* ===== Admin warning ===== */
.lesson-admin-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px 16px;
    padding: 14px 16px 14px 20px;
    background: var(--wrong-soft);
    border: 1px solid #f6c9ca;
    border-radius: 16px;
}

.lesson-admin-text {
    flex: 1 1 220px;
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.45;
    color: var(--wrong);
}

.lesson-empty {
    margin: 0;
    padding: 24px;
    font-size: var(--body-font);
    color: var(--ink-soft);
    text-align: center;
    background: var(--surface);
    border-radius: var(--card-radius);
}

/* ===== Loading (global on purpose: Account, ExternalLoginSuccess and the
   subscription guard use this spinner without styles of their own) ===== */
.module-loading-container {
    text-align: center;
    padding: 3rem;
    width: 100%;
    box-sizing: border-box;
}

    .module-loading-container p {
        color: #888;
        font-size: 15px;
        margin-top: 0.5rem;
    }

.loading-spinner {
    display: inline-block;
    width: 70px;
    height: 70px;
    margin: 20px auto;
    position: relative;
}

    .loading-spinner::after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        border: 4px solid rgba(0, 0, 0, 0.1);
        border-radius: 50%;
        border-top: 4px solid #000;
        animation: spin 0.85s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
        box-sizing: border-box;
    }

    .loading-spinner::before {
        content: "";
        position: absolute;
        width: 30px;
        height: 30px;
        top: 52%;
        left: 50%;
        transform: translate(-50%, -50%);
        background: url('/favicon.svg') no-repeat center center;
        background-size: contain;
        z-index: 5;
    }

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* ===== Hover (mouse/trackpad only — see CLAUDE.md) ===== */
@media (hover: hover) and (pointer: fine) {
    .lesson-page .ls-btn:hover:not(:disabled) {
        color: var(--btn-fill-ink);
        background: var(--btn-color);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
        transform: translateY(-2px);
    }

    .lesson-toggle:hover {
        background-color: var(--brand-soft);
    }

    .lesson-page .mistake-question-content .image-icon-btn:hover {
        background: #e6edff;
    }
}

@media (prefers-reduced-motion: reduce) {
    .lesson-page .skeleton-line {
        animation: none;
    }

    .lesson-page .ls-btn {
        transition: none;
    }
}

/* ===== Laptop ===== */
@media (max-width: 1500px) {
    .lesson-page {
        --page-max: 940px;
        --card-pad-y: 18px;
        --card-pad-x: 20px;
        --ring-size: 82px;
        --ring-width: 6px;
        --ring-font: 15px;
        --pill-pad: 0.2rem 0.6rem;
        --hero-title-font: 22px;
        --title-font: 18px;
        --label-col: 160px;
    }
}

/* ===== Tablet (≤ 992px): buttons shrink like NavigationButtons ===== */
@media (max-width: 992px) {
    .lesson-page .ls-btn {
        height: 42px;
        padding: 0 22px;
        font-size: 14px;
        border-radius: 21px;
    }
}

@media (max-width: 768px) {
    .lesson-page {
        --page-margin-top: 12px;
        --card-radius: 18px;
        --card-pad-y: 16px;
        --card-pad-x: 18px;
        --card-gap: 14px;
        padding: 0 0 24px;
    }

    .lesson-page .words-content .words-list {
        grid-template-columns: 1fr;
    }
}

/* ===== Narrow cards (≤ 640px): details stack, the action gets its own row ===== */
@media (max-width: 640px) {
    .lesson-card-head {
        grid-template-columns: auto minmax(0, 1fr);
    }

    .lesson-action {
        grid-column: 1 / -1;
    }

        .lesson-action .ls-btn {
            width: 100%;
            min-width: 0;
        }

    .lesson-page .lesson-body .section {
        grid-template-columns: 1fr;
        gap: 10px;
        padding: 14px 0;
    }

    .lesson-page .lesson-body .section-header {
        padding-top: 0;
    }

    /* Collapsed / expanded cards */
    .lesson-card.is-collapsed .lesson-body {
        display: none;
    }

    .lesson-card.is-collapsed .lesson-summary:has(.lesson-summary-items) {
        display: block;
        grid-column: 1 / -1;
        cursor: pointer;
    }

    .lesson-toggle {
        display: flex;
    }

    .lesson-titles {
        cursor: pointer;
    }

    /* Small buttons stretch across the card: reachable with either thumb */
    .lesson-page .ls-btn.is-sm {
        width: 100%;
        height: 38px;
        font-size: 14px;
        border-radius: 19px;
    }
}

/* ===== Phones (≤ 480px, iPhone 16 = 393px): text stays at 15–18px ===== */
@media (max-width: 480px) {
    .lesson-page {
        --page-margin-top: 4px;
        --card-radius: 16px;
        --card-pad-y: 14px;
        --card-pad-x: 14px;
        --card-gap: 12px;
        --ring-size: 64px;
        --ring-width: 5px;
        --ring-font: 12px;
        --pill-pad: 0.12rem 0.4rem;
        --hero-title-font: 19px;
        --title-font: 17px;
        --body-font: 15px;
        --icon-tile: 42px;
    }

    /* Compact on phones, in scale with the page's 15–17px text */
    .lesson-page .ls-btn {
        height: 44px;
        padding: 0 20px;
        font-size: 15px;
        border-radius: 22px;
    }

    .lesson-hero {
        gap: 14px;
        align-items: flex-start;
    }

    .lesson-card-head {
        gap: 12px;
    }

    .module-loading-container {
        padding: 2rem 1rem;
    }
}

/* ===== Narrow phones (≤ 360px) ===== */
@media (max-width: 360px) {
    .lesson-page {
        --card-pad-x: 12px;
        --ring-size: 58px;
        --ring-font: 11px;
        --pill-pad: 0.1rem 0.35rem;
        --hero-title-font: 18px;
        --title-font: 16px;
        --body-font: 14px;
    }
}