/* ==========================================================================
   GRAMMAR.CSS - Grammar exercise pages and template UIs
   ========================================================================== */

.grammar-stage {
    display: grid;
    gap: 24px;
}

.grammar-card {
    background: transparent;
    border: 0;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
}

.grammar-card--centered {
    text-align: center;
}

.grammar-kicker {
    margin: 0 0 8px 0;
    color: #0f766e;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.grammar-prompt,
.grammar-question-line {
    margin: 0;
    color: #1f2937;
    font-size: clamp(1.35rem, 2.5vw, 2rem);
    font-weight: 700;
    line-height: 1.35;
}

.grammar-blank,
.grammar-gap {
    font: inherit;
    display: inline-flex;
    min-width: 88px;
    justify-content: center;
    align-items: center;
    padding: 0.18rem 0.8rem;
    border-radius: 999px;
    border: 2px dashed #99f6e4;
    background: #f0fdfa;
    color: #0f766e;
    font-weight: 800;
    line-height: 1.2;
    vertical-align: baseline;
}

.grammar-gap {
    background: rgba(255, 179, 0, 0.46);
    border-color: #F59E0B;
    color: #1f2937;
    cursor: pointer;
    transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.grammar-gap:hover {
    border-color: #D97706;
    background: rgba(255, 179, 0, 0.56);
    transform: translateY(-1px);
}

.grammar-blank--filled,
.grammar-gap--filled {
    border-style: solid;
    border-color: #14b8a6;
    background: #ccfbf1;
}

.grammar-visual-grid {
    display: grid;
    grid-template-columns: minmax(220px, 0.95fr) minmax(0, 1.05fr);
    gap: 24px;
    align-items: center;
}

.grammar-visual-figure {
    margin: 0;
    background: linear-gradient(180deg, #f8fafc 0%, #eefdf9 100%);
    border: 1px solid #d7f5ee;
    border-radius: 18px;
    padding: 18px;
}

.grammar-visual-figure img {
    display: block;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    aspect-ratio: 4 / 3;
    object-fit: contain;
}

.grammar-visual-figure.is-missing {
    display: grid;
    place-items: center;
    min-height: 220px;
}

.grammar-visual-fallback {
    display: grid;
    gap: 8px;
    text-align: center;
    color: #475569;
}

.grammar-visual-fallback strong {
    color: #0f766e;
    font-size: 1.05rem;
}

.grammar-options,
.grammar-choice-list,
.grammar-chat-options,
.grammar-inline-options,
.grammar-detective-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.grammar-option,
.grammar-choice,
.grammar-chat-reply,
.grammar-inline-option,
.grammar-detective-option,
.grammar-tile,
.grammar-action-button {
    appearance: none;
    border: 2px solid #d1d5db;
    background: #ffffff;
    border-radius: 14px;
    color: #1f2937;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    line-height: 1.2;
    padding: 0.85rem 1.1rem;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.grammar-option:hover,
.grammar-choice:hover,
.grammar-chat-reply:hover,
.grammar-inline-option:hover,
.grammar-detective-option:hover,
.grammar-tile:hover,
.grammar-action-button:hover {
    border-color: #14b8a6;
    box-shadow: 0 8px 16px rgba(20, 184, 166, 0.14);
    transform: translateY(-1px);
}

.grammar-option.is-large,
.grammar-chat-reply,
.grammar-inline-option,
.grammar-detective-option {
    min-height: 56px;
}

.grammar-option.is-correct,
.grammar-choice.is-correct,
.grammar-chat-reply.is-correct,
.grammar-inline-option.is-correct,
.grammar-detective-option.is-correct,
.grammar-tile.is-correct,
.grammar-word.is-correct {
    border-color: #22c55e;
    background: #f0fdf4;
    color: #166534;
}

.grammar-option.is-wrong,
.grammar-choice.is-wrong,
.grammar-chat-reply.is-wrong,
.grammar-inline-option.is-wrong,
.grammar-detective-option.is-wrong,
.grammar-tile.is-wrong,
.grammar-word.is-wrong,
.grammar-answer.is-wrong {
    border-color: #ef4444;
    background: #fef2f2;
    color: #991b1b;
}

.grammar-option:disabled,
.grammar-choice:disabled,
.grammar-chat-reply:disabled,
.grammar-inline-option:disabled,
.grammar-detective-option:disabled,
.grammar-tile:disabled,
.grammar-word:disabled,
.grammar-action-button:disabled {
    cursor: default;
    opacity: 0.78;
}

.grammar-feedback {
    min-height: 1.4rem;
    color: #475569;
    font-size: 0.96rem;
    font-weight: 600;
}

.grammar-feedback.is-error {
    color: #b91c1c;
}

.grammar-feedback.is-success {
    color: #15803d;
}

.grammar-timer {
    height: 12px;
    overflow: hidden;
    border-radius: 999px;
    background: #e5e7eb;
}

.grammar-timer-fill {
    width: 100%;
    height: 100%;
    transform-origin: left center;
    background: linear-gradient(90deg, #14b8a6 0%, #0f766e 100%);
}

.grammar-timer-fill.is-expired {
    background: linear-gradient(90deg, #f59e0b 0%, #ef4444 100%);
}

.grammar-builder {
    display: grid;
    gap: 18px;
}

.grammar-answer {
    min-height: 84px;
    border: 2px dashed #cbd5e1;
    border-radius: 18px;
    background: #f8fafc;
    padding: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.grammar-answer-empty {
    color: #64748b;
    font-weight: 600;
}

.grammar-tile-bank {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.grammar-tile {
    padding-inline: 0.9rem;
}

.grammar-actions-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.grammar-inline-text {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.45rem 0.6rem;
    color: #1f2937;
    font-size: 1.05rem;
    line-height: 1.8;
}

.grammar-inline-sentence {
    display: inline;
}

.grammar-inline-sentence.is-current {
    font-weight: inherit;
}

.grammar-word-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.grammar-word {
    appearance: none;
    border: 2px solid #d1d5db;
    background: #ffffff;
    border-radius: 12px;
    color: #1f2937;
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    padding: 0.55rem 0.8rem;
    transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.grammar-word:hover {
    border-color: #14b8a6;
    transform: translateY(-1px);
}

.grammar-word.is-active {
    border-color: #14b8a6;
    background: #ecfeff;
    color: #0f766e;
}

.grammar-chat {
    display: grid;
    gap: 18px;
}

.grammar-chat-thread {
    display: grid;
    gap: 12px;
}

.grammar-chat-bubble {
    max-width: min(100%, 540px);
    padding: 14px 16px;
    border-radius: 18px;
    font-size: 1rem;
    line-height: 1.5;
}

.grammar-chat-bubble--prompt {
    background: #ecfeff;
    border: 1px solid #a5f3fc;
    justify-self: start;
}

.grammar-chat-bubble--reply {
    background: #ecfccb;
    border: 1px solid #bef264;
    justify-self: end;
}

.grammar-chat-bubble--fading {
    opacity: 0.4;
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.45) 38%, rgba(0, 0, 0, 0.9) 100%);
    mask-image: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.45) 38%, rgba(0, 0, 0, 0.9) 100%);
}

.grammar-empty-state,
.grammar-error-state {
    display: grid;
    gap: 12px;
    justify-items: center;
    text-align: center;
    padding: 28px 20px;
}

.grammar-empty-state h2,
.grammar-error-state h2 {
    margin: 0;
    color: #1f2937;
}

.grammar-explanation {
    margin-top: 26px;
    padding: 28px 24px;
    border-radius: 18px;
    border: 1px solid #dbe4ee;
    background: #ffffff;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
}

.grammar-explanation h2,
.grammar-explanation h3 {
    color: #1f2937;
}

.grammar-explanation p,
.grammar-explanation li {
    color: #334155;
    line-height: 1.75;
}

.grammar-explanation ul {
    padding-left: 1.2rem;
}

.button.is-success.button-disabled,
.button[aria-disabled="true"] {
    opacity: 0.55;
    pointer-events: none;
}

.final-screen {
    text-align: center;
    padding: 60px 40px;
    animation: grammarFadeIn 0.45s ease-out;
}

.final-screen h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #212529;
    font-weight: 800;
}

.congrats-icon {
    font-size: 4.5rem;
    margin-bottom: 20px;
}

.result-stats-box {
    background: #faf9f6;
    border: 2px solid #48c78e;
    border-radius: 15px;
    padding: 30px 20px;
    margin: 30px auto;
    max-width: 450px;
    text-align: center;
}

.final-stat {
    margin: 20px 0;
    font-size: 1.2rem;
}

.final-stat strong {
    color: #212529;
}

.final-stat-results {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.final-stat-results .result-pill {
    gap: 6px;
}

.final-cat-icons {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 36px;
    margin-top: 10px;
}

.final-cat-icon {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.final-actions {
    margin-top: 30px;
    width: 100%;
}

.final-screen .buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: stretch;
    gap: 10px;
}

.final-actions a.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 600;
    line-height: 1.2;
    min-height: 48px;
    white-space: nowrap;
    box-sizing: border-box;
    max-width: 100%;
}

@keyframes grammarFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 920px) {
    .grammar-visual-grid {
        grid-template-columns: 1fr;
    }

    .grammar-card {
        padding: 20px;
    }
}

@media (max-width: 640px) {
    .grammar-card {
        padding: 18px;
        border-radius: 14px;
    }

    .grammar-prompt,
    .grammar-question-line {
        font-size: 1.2rem;
    }

    .grammar-option,
    .grammar-choice,
    .grammar-chat-reply,
    .grammar-inline-option,
    .grammar-detective-option,
    .grammar-tile,
    .grammar-action-button,
    .grammar-word {
        width: 100%;
        justify-content: center;
    }

    .final-screen {
        padding: 42px 18px;
    }
}