/* =====================================
   Quiz Engine — visual system
   ===================================== */

.quizScreen {
    --quiz-ui-surface: #ffffff;
    --quiz-ui-text: #172033;
    --quiz-ui-muted: #667085;
    --quiz-ui-accent: #2563eb;
    width: min(680px, calc(100% - 40px));
    min-height: 100vh;
    margin: 0 auto;
    padding: 24px 0 32px;
    color: var(--quiz-ui-text);
    text-align: center;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.quizScreen h1,
.quizScreen h2,
.quizScreen .scoreBox,
.quizScreen .questionBox,
.quizScreen .quizQuestion,
.quizScreen .quizOptions,
.quizScreen .quizMessage {
    flex: 0 0 auto;
}

.quizScreen h1 { margin: 0 0 12px; }
.quizScreen h2 { margin: 12px 0; }

.quizScreen .scoreBox,
.quizScreen .questionBox {
    width: min(520px, 100%);
    margin: 12px auto;
    padding: 12px 16px;
    box-sizing: border-box;
    border-radius: 14px;
    background: #f4f7fb;
    color: var(--quiz-ui-text);
    font-weight: 700;
}

.quizScreen .questionBox { color: var(--quiz-ui-muted); }

.quizQuestion {
    display: flex;
    align-items: center;
    justify-content: center;
    width: min(520px, 100%);
    min-height: 110px;
    margin: 20px auto;
    padding: 20px;
    box-sizing: border-box;
    border-radius: 18px;
    background: var(--quiz-ui-surface);
    box-shadow: 0 8px 26px rgba(15,23,42,.08);
    line-height: 1.8;
    text-align: center;
}

/* دو گزینهٔ پاسخ در یک ردیف */
.quizOptions {
    width: min(520px, 100%);
    margin: 18px auto;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.quizOptionBtn {
    width: 100%;
    min-height: 54px;
    padding: 13px 18px;
    border: 2px solid #dbe4ef;
    border-radius: 15px;
    background: #fff;
    color: var(--quiz-ui-text);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: transform .15s ease, border-color .15s ease, background .15s ease;
}

.quizOptionBtn:hover:not(:disabled) { transform: translateY(-1px); border-color: #93b4e8; background: #f7faff; }
.quizOptionBtn:disabled { cursor: default; opacity: .82; }

.quizMessage { min-height: 32px; margin: 12px auto; font-weight: 800; }
.quizMessage.correct { color: #18794e; }
.quizMessage.wrong { color: #b42318; }
.quizMessage.learning {
    width: min(520px, 100%);
    padding: 12px 16px;
    box-sizing: border-box;
    border-radius: 14px;
    background: #f2f4f7;
    color: #344054;
    line-height: 1.8;
    font-weight: 600;
}

@media (max-width: 480px) {
    .quizScreen {
        width: min(100% - 20px, 680px);
        min-height: 100vh;
        padding-top: 16px;
    }

    .quizQuestion {
        width: 100%;
        min-height: 96px;
        padding: 16px;
    }

    .quizOptions {
        width: 100%;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}


/* Even/odd activity: turn the plain quiz into a playful challenge board. */
.quizScreen.quizGameBoard {
    --quiz-ui-accent: #6d4aff;
    width: min(720px, calc(100% - 28px));
    padding: 20px 0 36px;
    gap: 8px;
    background:
        radial-gradient(ellipse at 12% 6%, rgba(255, 205, 86, .22), transparent 30%),
        radial-gradient(ellipse at 90% 28%, rgba(99, 214, 201, .2), transparent 28%);
    border-radius: 28px;
}
.quizScreen .gameMasthead {
    width: min(560px, 100%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 0 auto 6px;
}
.quizScreen .gameBrand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-align: right;
}
.quizScreen .gameBadge {
    display: grid;
    place-items: center;
    width: 54px;
    height: 54px;
    flex: 0 0 54px;
    border-radius: 18px;
    background: linear-gradient(145deg, #7657ff, #4d32d6);
    color: white;
    font-size: 27px;
    box-shadow: 0 7px 0 #35219b, 0 12px 22px rgba(78, 51, 216, .22);
}
.quizScreen .gameBrand h1 {
    margin: 0;
    font-size: clamp(17px, 3.5vw, 22px);
    font-weight: 900;
}
.quizScreen .gameBrand p {
    margin: 3px 0 0;
    color: #69738a;
    font-size: 13px;
}
.quizScreen .gameScore {
    padding: 10px 14px;
    border: 2px solid #ffe08a;
    border-radius: 16px;
    background: #fff8d9;
    color: #815400;
    font-weight: 900;
    white-space: nowrap;
    box-shadow: 0 4px 0 #f2cd68;
}
.quizScreen .gameTitle {
    margin: 10px 0 2px;
    color: #34256e;
    font-size: clamp(20px, 4vw, 26px);
    font-weight: 900;
}
.quizScreen .gameProgress {
    width: min(560px, 100%);
    margin: 8px auto 10px;
    text-align: right;
}
.quizScreen .gameProgressLabels {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 7px;
    color: #59627a;
    font-size: 13px;
    font-weight: 800;
}
.quizScreen .gameProgressTrack {
    height: 12px;
    overflow: hidden;
    border-radius: 999px;
    background: #e5e7f3;
    box-shadow: inset 0 2px 4px rgba(36, 30, 85, .1);
}
.quizScreen .gameProgressFill {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #31c8ad, #6a50ed);
    transition: width .35s ease;
}
.quizScreen .questionBox {
    width: auto;
    max-width: 100%;
    margin: 4px auto;
    padding: 8px 14px;
    border: 1px solid #ded7ff;
    border-radius: 999px;
    background: #f1edff;
    color: #5942bd;
    font-size: 13px;
    font-weight: 900;
}
.quizScreen .quizQuestion {
    position: relative;
    width: min(560px, 100%);
    min-height: 150px;
    margin: 12px auto;
    padding: 28px 24px;
    border: 3px solid #e9e3ff;
    border-radius: 26px;
    background: linear-gradient(145deg, #fff 15%, #f7f4ff);
    box-shadow: 0 7px 0 #e0d8ff, 0 14px 30px rgba(62, 43, 132, .09);
    font-size: clamp(19px, 4vw, 25px);
    font-weight: 900;
    line-height: 1.9;
}
.quizScreen .quizOptions {
    width: min(560px, 100%);
    gap: 14px;
    margin: 14px auto;
}
.quizScreen .quizOptionBtn {
    position: relative;
    min-height: 68px;
    padding: 15px 18px;
    border: 2px solid #d9d6f2;
    border-radius: 20px;
    background: linear-gradient(180deg, #fff, #f8f7ff);
    box-shadow: 0 5px 0 #e3e0f5;
    font-size: 17px;
    font-weight: 900;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease, background .15s ease;
}
.quizScreen .quizOptionBtn:hover:not(:disabled) {
    transform: translateY(-3px);
    border-color: #8872f5;
    background: #f0edff;
    box-shadow: 0 8px 0 #d8d0ff;
}
.quizScreen .quizOptionBtn:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #d8d0ff;
}
.quizScreen #skipOptionalChallenge {
    width: min(360px, 100%);
    min-height: 48px;
    border-color: #d5d9e5;
    background: #f8fafc;
    box-shadow: none;
    color: #596579;
    font-size: 14px;
}
.quizScreen .quizMessage {
    width: min(560px, 100%);
    box-sizing: border-box;
    padding: 10px 14px;
    border-radius: 16px;
    line-height: 1.8;
}
.quizScreen .quizMessage.correct {
    background: #e5fbf0;
    border: 1px solid #a6edc8;
}
.quizScreen .quizMessage.learning {
    background: #fff7df;
    border: 1px solid #ffe19a;
    color: #79551a;
}
@media (max-width: 480px) {
    .quizScreen.quizGameBoard { width: calc(100% - 20px); padding-top: 14px; }
    .quizScreen .gameMasthead, .quizScreen .gameProgress { width: 100%; }
    .quizScreen .gameBadge { width: 44px; height: 44px; flex-basis: 44px; border-radius: 14px; font-size: 23px; }
    .quizScreen .gameBrand p { font-size: 11px; }
    .quizScreen .gameScore { padding: 8px 10px; font-size: 13px; }
    .quizScreen .quizQuestion { min-height: 126px; padding: 22px 16px; }
    .quizScreen .quizOptionBtn { min-height: 62px; padding: 12px 10px; font-size: 15px; }
}


/* Shared quiz theme variants: all QuizEngine activities use the same game-board layout. */
.quizScreen.quizThemeDivisibility {
    --quiz-ui-accent: #0f9f95;
    background:
        radial-gradient(ellipse at 12% 6%, rgba(255, 211, 111, .22), transparent 30%),
        radial-gradient(ellipse at 90% 28%, rgba(45, 212, 191, .20), transparent 28%);
}
.quizScreen.quizThemeDivisibility .gameBadge {
    background: linear-gradient(145deg, #16b8a6, #087f8c);
    box-shadow: 0 7px 0 #075e65, 0 12px 22px rgba(8, 127, 140, .22);
}
.quizScreen.quizThemeDivisibility .gameTitle { color: #075e65; }
.quizScreen.quizThemeDivisibility .questionBox {
    border-color: #b7eee6;
    background: #e7fbf7;
    color: #087f8c;
}
.quizScreen.quizThemeDivisibility .quizQuestion {
    border-color: #c7f1ea;
    background: linear-gradient(145deg, #fff 15%, #effdfa);
    box-shadow: 0 7px 0 #c5eee7, 0 14px 30px rgba(8, 127, 140, .09);
}
.quizScreen.quizThemeDivisibility .quizOptionBtn { border-color: #c4e9e5; box-shadow: 0 5px 0 #d6f1ed; }
.quizScreen.quizThemeDivisibility .quizOptionBtn:hover:not(:disabled) {
    border-color: #0f9f95;
    background: #e7fbf7;
    box-shadow: 0 8px 0 #b7e8e1;
}
@media (prefers-reduced-motion: reduce) {
    .quizScreen .gameProgressFill,
    .quizScreen .quizOptionBtn { transition: none !important; }
}