.screen {
    display: none;
    position: relative;
    width: 100%;
    min-height: 100dvh;
    height: auto;
    overflow: visible;
    z-index: 1;
}

.screen.is-active {
    display: block;
    animation: fade-in var(--transition-normal);
}

/* Gameplay screens: always allow vertical scroll when content is tall */
#questionScreen.is-active,
#feedbackScreen.is-active,
#resultScreen.is-active,
#errorScreen.is-active {
    position: absolute;
    inset: 0;
    min-height: 0;
    height: 100%;
    max-height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    touch-action: pan-y;
}

#questionScreen.is-active .screen__inner,
#feedbackScreen.is-active .screen__inner,
#errorScreen.is-active .screen__inner {
    min-height: auto;
    height: auto;
    max-height: none;
    overflow: visible;
    padding-bottom: calc(96px + env(safe-area-inset-bottom, 0px));
}

#resultScreen.is-active .screen__inner {
    min-height: 100%;
    height: 100%;
    max-height: none;
    overflow: visible;
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
}

#questionScreen .question-layout,
#questionScreen .question-main,
#questionScreen .answer-grid {
    height: auto;
    max-height: none;
    overflow: visible;
}

.screen__inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    width: min(100%, var(--app-max-width));
    min-height: 100dvh;
    height: auto;
    margin-inline: auto;
    padding: clamp(var(--space-md), 3vh, var(--space-xl))
        clamp(var(--space-md), 4vw, var(--space-xxl));
    padding-bottom: max(
        clamp(var(--space-md), 3vh, var(--space-xl)),
        env(safe-area-inset-bottom, 0px)
    );
}

/* IDLE — centered welcome */
.idle-screen {
    background: transparent;
}

.idle-screen.is-active {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100dvh;
    overflow: visible;
}

.idle-shell {
    direction: rtl;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 100dvh;
    margin: 0;
    padding: clamp(24px, 6vh, 72px) clamp(20px, 4vw, 48px);
    box-sizing: border-box;
}

.idle-panel {
    direction: rtl;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: clamp(16px, 3vh, 32px);
    width: min(100%, 680px);
    min-width: 0;
    padding: 0;
    text-align: center;
    background: transparent;
    box-sizing: border-box;
}

.idle-hero__title {
    font-size: clamp(2.8rem, 6vw, 4.75rem);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-tight);
    color: #0a5c63;
    letter-spacing: -0.02em;
}

.idle-hero__subtitle {
    font-size: clamp(1.25rem, 2.2vw, 1.8rem);
    color: #5a6b78;
    font-weight: var(--font-weight-bold);
}

.idle-fact {
    width: min(100%, 720px);
    min-height: auto;
    display: grid;
    place-items: center;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    background: #ffffff;
    border: 1px solid rgba(10, 92, 99, 0.12);
    box-shadow: 0 10px 28px rgba(8, 30, 36, 0.08);
}

.idle-fact__label {
    margin-block-end: var(--space-xs);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.idle-fact__text {
    font-size: clamp(1.05rem, 1.6vw, 1.35rem);
    line-height: var(--line-relaxed);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-medium);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.idle-fact__text.is-changing {
    opacity: 0;
    transform: translateY(8px);
}

.idle-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-block: var(--space-xs);
}

.cta-btn--idle {
    width: 100%;
    min-width: 0;
    background: #0a5c63;
    box-shadow: 0 14px 36px rgba(10, 92, 99, 0.28);
}

.cta-btn--idle:hover {
    background: #084d53;
}

@media (max-width: 900px), (max-height: 620px) and (orientation: landscape) {
    .idle-shell {
        padding: clamp(20px, 4vh, 36px) 16px
            calc(24px + env(safe-area-inset-bottom, 0px));
    }

    .idle-panel {
        gap: var(--space-md);
    }
}

/* QUESTION */
.question-layout {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    min-height: 100%;
}

.question-top {
    display: grid;
    gap: var(--space-md);
}

.question-top__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
}

.question-main {
    display: flex;
    flex-direction: column;
    flex: 1 0 auto;
    gap: var(--space-lg);
    min-height: auto;
    overflow: visible;
    animation: slide-up var(--transition-normal);
}

.question-main__header {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.question-title {
    font-size: clamp(1.75rem, 2.8vw, 3.1rem);
    line-height: var(--line-tight);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    max-width: none;
    width: 100%;
}

.question-bottom {
    display: grid;
    gap: var(--space-sm);
    margin-top: auto;
    flex-shrink: 0;
    padding-bottom: var(--space-sm);
}

.question-bottom__label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* FEEDBACK */
.feedback-layout {
    flex: 1;
    display: grid;
    place-items: center;
}

.feedback-card {
    width: min(100%, 900px);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-lg);
    padding: clamp(var(--space-xl), 4vw, var(--space-xxl));
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    animation: slide-up var(--transition-normal);
}

.feedback-card.is-correct {
    border-color: color-mix(in srgb, var(--color-success) 45%, var(--color-border));
}

.feedback-card.is-incorrect {
    border-color: color-mix(in srgb, var(--color-error) 45%, var(--color-border));
}

.feedback-status {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.feedback-card.is-correct .feedback-status {
    color: var(--color-success);
}

.feedback-card.is-incorrect .feedback-status {
    color: var(--color-error);
}

.feedback-correct-block {
    width: 100%;
    display: grid;
    gap: var(--space-sm);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    background: var(--color-surface-soft);
    text-align: start;
}

.feedback-correct-block__label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.feedback-correct-block__value {
    font-size: clamp(1.25rem, 2vw, 1.8rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    line-height: var(--line-normal);
}

.feedback-explanation {
    width: 100%;
    text-align: start;
    font-size: clamp(1.1rem, 1.5vw, 1.4rem);
    line-height: var(--line-relaxed);
    color: var(--color-text-secondary);
}

.feedback-explanation:empty {
    display: none;
}

/* RESULT */
.result-layout {
    flex: 1;
    display: grid;
    grid-template-rows: auto 1fr;
    align-items: stretch;
    justify-items: stretch;
    gap: var(--space-md);
    min-height: 100%;
    width: 100%;
}

.result-layout__nav {
    width: 100%;
    justify-self: start;
    z-index: 2;
}

.result-layout .result-card {
    place-self: center;
    margin: 0;
}

.result-card {
    width: min(100%, 780px);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-lg);
    padding: clamp(var(--space-xl), 5vw, var(--space-3xl));
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

.result-card__title {
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.result-card__label {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

.result-card__score {
    font-size: var(--font-size-display);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    line-height: 1;
    animation: score-reveal var(--transition-slow);
}

.result-card__message {
    max-width: 28ch;
    font-size: var(--font-size-md);
    line-height: var(--line-relaxed);
    color: var(--color-text-secondary);
}

/* ERROR */
.error-layout {
    flex: 1;
    display: grid;
    place-items: center;
    text-align: center;
}

.error-card {
    width: min(100%, 640px);
    display: grid;
    gap: var(--space-md);
    padding: var(--space-xxl);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

.error-card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.error-card__message {
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
}