/* =========================================================
   BATLINGO - REVIEW MODERN
   VERSION 3.0

   FEATURES
   - Stable answer position
   - Four vertical answer buttons
   - Reserved feedback space
   - Reserved action space
   - Desktop and mobile responsive
   - No vertical jumping after answering
========================================================= */


/* =========================================================
   01. REVIEW SCREEN
========================================================= */

#reviewScreen.review-screen {
    position: fixed;
    inset: 0;
    z-index: 1000;

    display: flex;
    flex-direction: column;
    align-items: center;

    width: 100%;
    height: 100vh;
    height: 100dvh;

    padding:
        max(14px, env(safe-area-inset-top))
        16px
        max(14px, env(safe-area-inset-bottom));

    overflow-x: hidden;
    overflow-y: auto;

    box-sizing: border-box;

    background:
        radial-gradient(
            ellipse at 50% 20%,
            rgba(30, 58, 110, 0.3),
            transparent 65%
        ),
        linear-gradient(
            160deg,
            #080d17 0%,
            #101b30 55%,
            #080d17 100%
        );

    color: #f8fafc;
}

#reviewScreen.hidden {
    display: none !important;
}

#reviewScreen,
#reviewScreen * {
    box-sizing: border-box;
}


/* =========================================================
   02. HEADER
========================================================= */

#reviewScreen .review-header {
    display: flex;
    align-items: center;

    width: 100%;
    max-width: 720px;

    min-height: 52px;
    flex: 0 0 auto;

    margin: 0 auto 14px;

    gap: 14px;
}

#reviewScreen .review-back-button {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 44px;
    height: 44px;

    flex: 0 0 44px;

    padding: 0;

    border: 1px solid #334155;
    border-radius: 12px;

    background: #1e293b;
    color: #f8fafc;

    font-family: inherit;
    font-size: 24px;

    cursor: pointer;

    transition:
        background 0.18s,
        border-color 0.18s;
}

#reviewScreen .review-back-button:hover {
    background: #334155;
    border-color: #64748b;
}

#reviewScreen .review-header-info {
    display: flex;
    flex-direction: column;
    justify-content: center;

    min-width: 0;

    gap: 4px;
}

#reviewScreen .review-title {
    font-size: 20px;
    font-weight: 850;
    letter-spacing: 1.5px;

    color: #f8fafc;
}

#reviewScreen .review-session-info {
    color: #86efac;

    font-size: 12px;
    font-weight: 750;
    letter-spacing: 0.6px;
}


/* =========================================================
   03. MAIN CARD
========================================================= */

#reviewScreen .review-card {
    display: flex;
    flex-direction: column;
    align-items: stretch;

    width: 100%;
    max-width: 720px;

    /*
       Card grows toward the bottom on tall screens.
       Its child question/answers do NOT grow.
    */

    flex: 1 0 auto;

    min-height: 0;

    margin: 0 auto;
    padding: 18px 22px;

    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 20px;

    background: rgba(15, 23, 42, 0.9);

    box-shadow:
        0 14px 40px rgba(0, 0, 0, 0.24);
}


/* =========================================================
   04. QUESTION LEVEL
========================================================= */

#reviewScreen .review-question-level {
    display: flex;
    align-items: center;
    justify-content: center;

    flex: 0 0 22px;

    height: 22px;

    margin: 0 0 8px;

    text-align: center;

    color: #94a3b8;

    font-size: 12px;
    font-weight: 800;
    letter-spacing: 1.2px;
}


/* =========================================================
   05. STREAK
========================================================= */

#reviewScreen .review-streak {
    display: flex;
    align-items: center;
    justify-content: center;

    align-self: center;

    flex: 0 0 31px;

    min-width: 84px;
    height: 31px;

    padding: 4px 14px;

    margin: 0;

    border: 1px solid #475569;
    border-radius: 999px;

    background: #1e293b;
    color: #fbbf24;

    font-size: 13px;
    font-weight: 850;

    white-space: nowrap;

    transition:
        background 0.15s,
        border-color 0.15s,
        color 0.15s;
}

#reviewScreen .review-streak.correct {
    color: #86efac;
    border-color: #22c55e;
    background: #14532d;
}

#reviewScreen .review-streak.wrong {
    color: #fca5a5;
    border-color: #ef4444;
    background: #450a0a;
}

#reviewScreen .review-streak.mastered {
    color: #fde68a;
    border-color: #f59e0b;
    background: #713f12;
}


/* =========================================================
   06. QUESTION
   FIXED HEIGHT - NO FLEX GROW
========================================================= */

#reviewScreen .review-question {
    display: flex;
    align-items: center;
    justify-content: center;

    flex: 0 0 108px;

    width: 100%;
    height: 108px;
    min-height: 108px;

    margin: 0;

    padding: 10px 8px;

    text-align: center;

    font-size: clamp(27px, 4vw, 42px);
    font-weight: 800;
    line-height: 1.35;

    color: #f8fafc;

    overflow-x: hidden;
    overflow-y: auto;

    overflow-wrap: anywhere;
    scrollbar-width: thin;

    cursor: pointer;
}


/* =========================================================
   07. HIRAGANA
   RESERVE SPACE BEFORE ANSWERING
========================================================= */

#reviewScreen .review-reading {
    display: flex;
    align-items: center;
    justify-content: center;

    flex: 0 0 30px;

    width: 100%;
    height: 30px;
    min-height: 30px;

    padding: 0 8px;

    margin: 0 0 12px;

    text-align: center;

    color: #86efac;

    font-size: 19px;
    font-weight: 700;
    line-height: 1.4;

    overflow-x: hidden;
    overflow-y: auto;
    overflow-wrap: anywhere;

    transition: none;
}


/* =========================================================
   08. ANSWER AREA
   ONE COLUMN - FOUR ROWS
========================================================= */

#reviewScreen .review-answers {
    display: grid;

    grid-template-columns: minmax(0, 1fr);
    grid-auto-flow: row;

    align-content: start;
    align-items: stretch;

    flex: 0 0 auto;

    width: 100%;

    gap: 10px;

    margin: 0;
    padding: 0;
}


/* =========================================================
   09. ANSWER BUTTONS
========================================================= */

#reviewScreen .review-answer-button {
    display: flex;
    align-items: center;
    justify-content: flex-start;

    width: 100%;
    min-width: 0;
    min-height: 60px;

    margin: 0;
    padding: 11px 16px;

    border: 2px solid #334155;
    border-radius: 12px;

    background: #1e293b;
    color: #f8fafc;

    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.45;

    text-align: left;

    white-space: normal;
    overflow-wrap: anywhere;

    cursor: pointer;

    transition:
        background 0.15s ease,
        border-color 0.15s ease;
}


/* =========================================================
   10. ANSWER NUMBER
========================================================= */

#reviewScreen .review-answer-number {
    display: flex;
    align-items: center;
    justify-content: center;

    flex: 0 0 32px;

    width: 32px;
    height: 32px;

    margin-right: 14px;

    border-radius: 9px;

    background: #334155;
    color: #cbd5e1;

    font-size: 14px;
    font-weight: 850;
}


/* =========================================================
   11. ANSWER TEXT
========================================================= */

#reviewScreen .review-answer-text {
    flex: 1 1 auto;

    min-width: 0;

    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;

    overflow-wrap: anywhere;
}


/* =========================================================
   12. ANSWER HOVER
========================================================= */

@media (hover: hover) {

    #reviewScreen
    .review-answer-button:not(:disabled):hover {
        background: #293b56;
        border-color: #60a5fa;
    }
}


/* =========================================================
   13. ANSWER CORRECT
========================================================= */

#reviewScreen .review-answer-button.correct {
    background: #14532d;
    border-color: #22c55e;
    color: #dcfce7;
}

#reviewScreen
.review-answer-button.correct
.review-answer-number {
    background: #22c55e;
    color: #052e16;
}


/* =========================================================
   14. ANSWER WRONG
========================================================= */

#reviewScreen .review-answer-button.wrong {
    background: #7f1d1d;
    border-color: #ef4444;
    color: #fee2e2;
}

#reviewScreen
.review-answer-button.wrong
.review-answer-number {
    background: #ef4444;
    color: #ffffff;
}


/* =========================================================
   15. ANSWER DISABLED
========================================================= */

#reviewScreen .review-answer-button:disabled {
    cursor: default;
    opacity: 1;
}


/* =========================================================
   16. FEEDBACK AREA
   FIXED HEIGHT - ALWAYS PRESENT

   Important:
   Do not use display:none for hidden feedback.
========================================================= */

#reviewScreen .review-feedback {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;

    flex: 0 0 142px;

    width: 100%;
    height: 142px;
    min-height: 142px;
    max-height: 142px;

    margin: 12px 0 0;
    padding: 12px 16px;

    border: 1px solid #475569;
    border-radius: 13px;

    background: rgba(30, 41, 59, 0.9);

    overflow: hidden;

    /*
       Visibility changes do not affect layout.
       This prevents answer position jumping.
    */

    visibility: visible;
    opacity: 1;

    transition: none;
}


/* =========================================================
   17. FEEDBACK CORRECT
========================================================= */

#reviewScreen .review-feedback.correct {
    border-color: #22c55e;
    background: rgba(20, 83, 45, 0.48);
}


/* =========================================================
   18. FEEDBACK WRONG
========================================================= */

#reviewScreen .review-feedback.wrong {
    border-color: #ef4444;
    background: rgba(127, 29, 29, 0.36);
}


/* =========================================================
   19. FEEDBACK STATUS
========================================================= */

#reviewScreen .review-feedback-status {
    flex: 0 0 auto;

    margin: 0 0 5px;

    text-align: left;

    font-size: 14px;
    font-weight: 850;
    line-height: 1.4;

    color: #f8fafc;
}

#reviewScreen
.review-feedback.correct
.review-feedback-status {
    color: #86efac;
}

#reviewScreen
.review-feedback.wrong
.review-feedback-status {
    color: #fca5a5;
}


/* =========================================================
   20. FEEDBACK CONTENT
========================================================= */

#reviewScreen .review-feedback-content {
    display: flex;
    flex-direction: column;
    align-items: center;

    flex: 1 1 auto;

    min-height: 0;

    width: 100%;
    gap: 3px;

    text-align: center;

    overflow: hidden;
}

#reviewScreen .review-feedback-word {
    flex: 0 0 auto;

    max-width: 100%;

    font-size: 22px;
    font-weight: 800;
    line-height: 1.4;

    color: #f8fafc;

    overflow-wrap: anywhere;
}

#reviewScreen .review-feedback-reading {
    flex: 0 0 auto;

    font-size: 17px;
    font-weight: 700;
    line-height: 1.4;

    color: #86efac;

    overflow-wrap: anywhere;
}

#reviewScreen .review-feedback-meaning {
    flex: 1 1 auto;

    width: 100%;
    min-height: 0;

    font-size: 14px;
    line-height: 1.5;

    color: #e2e8f0;

    white-space: pre-line;
    overflow-wrap: anywhere;

    overflow-x: hidden;
    overflow-y: auto;

    scrollbar-width: thin;
}


/* =========================================================
   21. ACTION AREA
   RESERVED BEFORE ANSWERING
========================================================= */

#reviewScreen .review-actions {
    display: grid;

    grid-template-columns:
        minmax(0, 1fr)
        minmax(0, 1.6fr);

    align-items: stretch;

    flex: 0 0 50px;

    width: 100%;
    height: 50px;
    min-height: 50px;

    gap: 10px;

    margin: 10px 0 0;
    padding: 0;

    visibility: visible;
    opacity: 1;

    transition: none;
}


/* =========================================================
   22. ACTION BUTTONS
========================================================= */

#reviewScreen .review-listen-button,
#reviewScreen .review-next-button {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 100%;
    min-width: 0;
    height: 50px;

    padding: 8px 12px;

    border: 0;
    border-radius: 11px;

    font-family: inherit;
    font-size: 14px;
    font-weight: 800;

    cursor: pointer;

    transition: background 0.15s;
}

#reviewScreen .review-listen-button {
    background: #334155;
    color: #f8fafc;
}

#reviewScreen .review-next-button {
    background: #2563eb;
    color: #fff;
}

#reviewScreen .review-listen-button:hover {
    background: #475569;
}

#reviewScreen .review-next-button:hover {
    background: #1d4ed8;
}

#reviewScreen .review-next-button:disabled {
    opacity: 0.65;
    cursor: wait;
}


/* =========================================================
   23. VISIBILITY HELPERS

   is-concealed:
   - hidden visually
   - still occupies layout space
   - children cannot be interacted with

   is-hidden:
   - completely removed from visual flow
   - only used for unavailable listen button
========================================================= */

#reviewScreen .is-concealed {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
}

#reviewScreen .review-feedback.is-concealed {
    display: flex;
}

#reviewScreen .review-actions.is-concealed {
    display: grid;
}

#reviewScreen .review-reading.is-concealed {
    display: flex;
}

#reviewScreen .is-hidden {
    display: none;
}

#reviewScreen
.review-listen-button.is-hidden
+ .review-next-button {
    grid-column: 1 / -1;
}


/* =========================================================
   24. REVIEW COMPLETE
========================================================= */

#reviewScreen.review-complete .review-question {
    font-size: 64px;
    color: #fbbf24;
}

#reviewScreen.review-complete .review-reading {
    color: #86efac;
    font-size: 18px;
}

#reviewScreen.review-complete .review-answers {
    min-height: 0;
}


/* =========================================================
   25. DESKTOP
========================================================= */

@media (min-width: 768px) {

    #reviewScreen .review-card {
        padding: 22px 28px;
    }

    #reviewScreen .review-header {
        margin-bottom: 16px;
    }

    #reviewScreen .review-question {
        flex-basis: 114px;
        height: 114px;
        min-height: 114px;

        font-size: clamp(30px, 3.8vw, 44px);
    }

    #reviewScreen .review-answers {
        gap: 11px;
    }

    #reviewScreen .review-answer-button {
        min-height: 62px;
        font-size: 17px;
    }
}


/* =========================================================
   26. TABLET AND MOBILE
========================================================= */

@media (max-width: 767px) {

    #reviewScreen.review-screen {
        padding-left: 10px;
        padding-right: 10px;
    }

    #reviewScreen .review-header {
        min-height: 46px;
        margin-bottom: 9px;
        gap: 10px;
    }

    #reviewScreen .review-back-button {
        width: 40px;
        height: 40px;
        flex-basis: 40px;
    }

    #reviewScreen .review-title {
        font-size: 18px;
    }

    #reviewScreen .review-session-info {
        font-size: 11px;
    }

    #reviewScreen .review-card {
        padding: 13px 12px;
        border-radius: 15px;
    }

    #reviewScreen .review-question-level {
        flex-basis: 19px;
        height: 19px;

        margin-bottom: 5px;

        font-size: 11px;
    }

    #reviewScreen .review-streak {
        flex-basis: 28px;
        height: 28px;

        font-size: 12px;
    }

    #reviewScreen .review-question {
        flex-basis: 91px;

        height: 91px;
        min-height: 91px;

        padding: 8px 6px;

        font-size: clamp(25px, 6.5vw, 35px);
    }

    #reviewScreen .review-reading {
        flex-basis: 25px;

        height: 25px;
        min-height: 25px;

        margin-bottom: 9px;

        font-size: 16px;
    }

    #reviewScreen .review-answers {
        gap: 8px;
    }

    #reviewScreen .review-answer-button {
        min-height: 53px;

        padding: 9px 11px;

        border-radius: 10px;

        font-size: 14px;
    }

    #reviewScreen .review-answer-number {
        flex-basis: 27px;

        width: 27px;
        height: 27px;

        margin-right: 10px;

        font-size: 12px;
    }

    #reviewScreen .review-feedback {
        flex-basis: 125px;

        height: 125px;
        min-height: 125px;
        max-height: 125px;

        margin-top: 10px;
        padding: 9px 11px;
    }

    #reviewScreen .review-feedback-status {
        font-size: 13px;
    }

    #reviewScreen .review-feedback-word {
        font-size: 19px;
    }

    #reviewScreen .review-feedback-reading {
        font-size: 15px;
    }

    #reviewScreen .review-feedback-meaning {
        font-size: 13px;
    }

    #reviewScreen .review-actions {
        flex-basis: 46px;

        height: 46px;
        min-height: 46px;

        margin-top: 9px;
        gap: 8px;
    }

    #reviewScreen .review-listen-button,
    #reviewScreen .review-next-button {
        height: 46px;

        padding: 7px 8px;

        font-size: 13px;
    }
}


/* =========================================================
   27. SMALL PHONES
========================================================= */

@media (max-width: 380px) {

    #reviewScreen .review-card {
        padding: 11px 9px;
    }

    #reviewScreen .review-question {
        flex-basis: 82px;
        height: 82px;
        min-height: 82px;

        font-size: 26px;
    }

    #reviewScreen .review-answer-button {
        min-height: 49px;
        padding: 8px 9px;
        font-size: 13px;
    }

    #reviewScreen .review-answers {
        gap: 7px;
    }

    #reviewScreen .review-feedback {
        flex-basis: 116px;
        height: 116px;
        min-height: 116px;
        max-height: 116px;
    }

    #reviewScreen .review-answer-number {
        margin-right: 8px;
    }
}


/* =========================================================
   28. SHORT LANDSCAPE SCREENS
========================================================= */

@media (max-height: 680px) {

    #reviewScreen .review-card {
        flex-grow: 0;
    }

    #reviewScreen .review-question {
        flex-basis: 78px;
        height: 78px;
        min-height: 78px;
    }

    #reviewScreen .review-answer-button {
        min-height: 48px;
    }

    #reviewScreen .review-answers {
        gap: 7px;
    }

    #reviewScreen .review-feedback {
        flex-basis: 112px;
        height: 112px;
        min-height: 112px;
        max-height: 112px;
    }
}


/* =========================================================
   29. FOCUS AND ACCESSIBILITY
========================================================= */

#reviewScreen button:focus-visible {
    outline: 3px solid #93c5fd;
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {

    #reviewScreen *,
    #reviewScreen *::before,
    #reviewScreen *::after {
        animation: none;
        transition: none;
    }
}