/* =========================================================
   ENGLISH GRAMMAR QUIZ
   Modern Quiz Theme
   Version - Updated Option Alignment
   ========================================================= */


/* =========================================================
   GLOBAL RESET
   ========================================================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


html {
    width: 100%;
    min-height: 100%;
}


body {
    font-family: "Segoe UI", Arial, sans-serif;

    background:
        radial-gradient(
            circle at top left,
            rgba(0, 106, 78, 0.18),
            transparent 35%
        ),
        radial-gradient(
            circle at bottom right,
            rgba(244, 42, 65, 0.12),
            transparent 35%
        ),
        #071c22;

    color: #ffffff;

    min-height: 100vh;

    padding: 40px 20px;

    display: flex;

    justify-content: center;

    align-items: center;
}


/* =========================================================
   MAIN CONTAINER
   ========================================================= */

main {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}


#quiz-screen,
#result-screen {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}


/* =========================================================
   START SCREEN
   ========================================================= */

#start-screen {
    width: 100%;

    text-align: center;

    padding: 35px 20px;
}


.top-badge {
    display: inline-block;

    padding: 8px 18px;

    border-radius: 30px;

    background: #006a4e;

    color: #ffffff;

    font-weight: 700;

    font-size: 14px;

    margin-bottom: 18px;

    border: 1px solid rgba(255,255,255,0.15);
}


#start-screen h1 {
    font-size: clamp(34px, 6vw, 58px);

    line-height: 1.1;

    margin-bottom: 10px;

    font-weight: 900;
}


#start-screen h2 {
    font-size: clamp(18px, 3vw, 27px);

    color: #f4d35e;

    margin-bottom: 20px;
}


.info-box {
    max-width: 650px;

    margin: 0 auto 25px;

    padding: 18px;

    background: rgba(255,255,255,0.06);

    border: 1px solid rgba(255,255,255,0.1);

    border-radius: 16px;

    line-height: 1.7;
}


.instruction {
    margin-bottom: 25px;

    color: #d8e5e2;
}


/* =========================================================
   MODE BUTTONS
   ========================================================= */

.mode-buttons {
    display: flex;

    justify-content: center;

    align-items: center;

    gap: 15px;

    flex-wrap: wrap;
}


.mode-buttons button {
    border: none;

    border-radius: 14px;

    padding: 15px 25px;

    font-size: 17px;

    font-weight: 800;

    cursor: pointer;

    transition: 0.25s ease;
}


/* Learning Mode */

.learning-mode-btn,
.mode-btn.learning {
    background: #006a4e;

    color: #ffffff;
}


/* Exam Mode */

.exam-mode-btn,
.mode-btn.exam {
    background: #e63946;

    color: #ffffff;
}


.mode-buttons button:hover {
    transform: translateY(-3px);

    box-shadow:
        0 8px 22px rgba(0,0,0,0.25);
}


/* =========================================================
   QUIZ SCREEN
   ========================================================= */

#quiz-screen {
    display: none;
}


.quiz-container {
    width: 100%;

    background: rgba(255,255,255,0.04);

    border: 1px solid rgba(255,255,255,0.1);

    border-radius: 24px;

    padding: 35px;

    box-shadow:
        0 20px 50px rgba(0,0,0,0.35);

    backdrop-filter: blur(10px);
}


/* =========================================================
   QUIZ TOP
   ========================================================= */

.quiz-top {
    display: flex;

    justify-content: space-between;

    align-items: center;

    gap: 15px;

    margin-bottom: 20px;
}


.question-counter {
    font-size: 16px;

    font-weight: 700;

    color: #d7e5e2;
}


.timer-box {
    min-width: 50px;

    height: 40px;

    display: flex;

    justify-content: center;

    align-items: center;

    background: #e63946;

    border-radius: 10px;

    font-weight: 900;

    font-size: 18px;

    color: #ffffff;
}


/* Timer danger */

.timer-danger {
    background: #c1121f !important;

    animation: timerPulse 0.8s infinite;
}


@keyframes timerPulse {

    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.06);
    }

    100% {
        transform: scale(1);
    }

}


/* =========================================================
   PROGRESS BAR
   ========================================================= */

.progress {
    width: 100%;

    height: 8px;

    background: rgba(255,255,255,0.1);

    border-radius: 20px;

    overflow: hidden;

    margin-bottom: 30px;
}


#progress-bar {
    width: 0%;

    height: 100%;

    background: #f4d35e;

    transition: width 0.3s ease;
}


/* =========================================================
   QUESTION
   ========================================================= */

#question {
    font-size: clamp(22px, 3.5vw, 30px);

    line-height: 1.5;

    font-weight: 800;

    margin-bottom: 30px;

    color: #ffffff;
}


/* Vocabulary word */

.vocabulary-word {
    display: inline-block;

    font-size: 1.05em;

    font-weight: 900;

    color: #ffffff;

    margin-bottom: 4px;
}


/* =========================================================
   ANSWER OPTIONS CONTAINER
   ========================================================= */

#options {
    width: 100%;

    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 16px;

    align-items: stretch;
}


/* =========================================================
   ANSWER BUTTON
   IMPORTANT:
   JS uses .option-btn
   ========================================================= */

.option-btn {
    width: 100%;

    min-height: 66px;

    padding: 10px 18px;

    display: flex;

    flex-direction: row;

    align-items: center;

    justify-content: flex-start;

    gap: 14px;

    border: 1px solid rgba(255,255,255,0.15);

    border-radius: 14px;

    background: rgba(255,255,255,0.92);

    color: #111111;

    text-align: left;

    cursor: pointer;

    font-family: "Segoe UI", Arial, sans-serif;

    /*
       Font increased from 17px to 21px
    */

    font-size: 21px;

    font-weight: 600;

    line-height: 1.35;

    transition:
        background 0.2s ease,
        border-color 0.2s ease,
        transform 0.2s ease,
        box-shadow 0.2s ease;

    /*
       Prevent browser from making disabled text faint
    */

    opacity: 1;

    -webkit-text-fill-color: #111111;
}


/* =========================================================
   OPTION LETTER A / B / C / D
   ========================================================= */

.option-letter {
    flex: 0 0 42px;

    width: 42px;

    height: 42px;

    display: flex;

    align-items: center;

    justify-content: center;

    align-self: center;

    border-radius: 50%;

    background: #edf0f2;

    color: #111111;

    font-size: 18px;

    font-weight: 900;

    line-height: 1;

    text-align: center;

    margin: 0;

    padding: 0;
}


/* =========================================================
   OPTION TEXT
   ========================================================= */

.option-text {
    flex: 1 1 auto;

    min-width: 0;

    display: flex;

    align-items: center;

    align-self: center;

    min-height: 42px;

    margin: 0;

    padding: 0;

    color: #111111;

    font-size: 21px;

    font-weight: 600;

    line-height: 1.35;

    text-align: left;

    /*
       Prevent text from dropping underneath A
    */

    white-space: normal;

    overflow-wrap: break-word;
}


/* =========================================================
   OPTION HOVER
   ========================================================= */

.option-btn:hover:not(:disabled) {

    background: #ffffff;

    border-color: #006a4e;

    transform: translateY(-2px);

    box-shadow:
        0 7px 18px rgba(0,0,0,0.20);

}


/* =========================================================
   DISABLED OPTIONS
   IMPORTANT:
   Text must NOT become blurry
   ========================================================= */

.option-btn:disabled {

    cursor: default;

    opacity: 1 !important;

    color: #111111 !important;

    -webkit-text-fill-color: #111111 !important;
}


.option-btn:disabled .option-text {

    color: #111111 !important;

    opacity: 1 !important;

    -webkit-text-fill-color: #111111 !important;
}


.option-btn:disabled .option-letter {

    opacity: 1 !important;
}


/* =========================================================
   CORRECT ANSWER
   ========================================================= */

.option-btn.correct {

    background: #087f5b !important;

    border-color: #55d6a7 !important;

    color: #ffffff !important;

    opacity: 1 !important;

    -webkit-text-fill-color: #ffffff !important;

    box-shadow:
        0 6px 18px rgba(8,127,91,0.30);
}


.option-btn.correct .option-letter {

    background: #ffffff;

    color: #087f5b;

    opacity: 1;

    -webkit-text-fill-color: #087f5b;
}


.option-btn.correct .option-text {

    color: #ffffff !important;

    opacity: 1 !important;

    -webkit-text-fill-color: #ffffff !important;

    font-weight: 700;
}


/* =========================================================
   WRONG ANSWER
   ========================================================= */

.option-btn.wrong {

    background: #a61e2b !important;

    border-color: #ff7b86 !important;

    color: #ffffff !important;

    opacity: 1 !important;

    -webkit-text-fill-color: #ffffff !important;

    box-shadow:
        0 6px 18px rgba(166,30,43,0.30);
}


.option-btn.wrong .option-letter {

    background: #ffffff;

    color: #a61e2b;

    opacity: 1;

    -webkit-text-fill-color: #a61e2b;
}


.option-btn.wrong .option-text {

    color: #ffffff !important;

    opacity: 1 !important;

    -webkit-text-fill-color: #ffffff !important;

    font-weight: 700;
}


/* =========================================================
   FEEDBACK
   ========================================================= */

#feedback {

    display: none;

    margin-top: 25px;

    padding: 20px;

    border-radius: 16px;

    background: rgba(255,255,255,0.06);

    border: 1px solid rgba(255,255,255,0.1);

    line-height: 1.7;
}


#correct-message {

    font-size: 18px;

    font-weight: 800;

    margin-bottom: 8px;

    color: #55d6a7;
}


#wrong-message {

    font-size: 17px;

    font-weight: 700;

    color: #ff7b86;
}


#example-text {

    margin-top: 12px;

    color: #f4d35e;

    font-size: 17px;

    line-height: 1.7;
}


/* =========================================================
   NEXT QUESTION BUTTON
   IMPORTANT:
   JS uses .next-btn
   ========================================================= */

.next-btn {

    width: 100%;

    min-height: 58px;

    margin-top: 22px;

    padding: 14px 24px;

    border: none;

    border-radius: 14px;

    /*
       Green button
    */

    background: #087f5b;

    color: #ffffff;

    font-family: "Segoe UI", Arial, sans-serif;

    font-size: 20px;

    font-weight: 900;

    line-height: 1.3;

    cursor: pointer;

    display: flex;

    align-items: center;

    justify-content: center;

    text-align: center;

    box-shadow:
        0 6px 18px rgba(8,127,91,0.25);

    transition:
        transform 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease;
}


.next-btn:hover {

    background: #0a966b;

    transform: translateY(-2px);

    box-shadow:
        0 9px 24px rgba(8,127,91,0.35);
}


.next-btn:active {

    transform: translateY(0);
}


/* Backward compatibility */

.next-question-btn {

    width: 100%;

    min-height: 58px;

    margin-top: 22px;

    padding: 14px 24px;

    border: none;

    border-radius: 14px;

    background: #087f5b;

    color: #ffffff;

    font-size: 20px;

    font-weight: 900;

    cursor: pointer;
}


/* =========================================================
   RESULT SCREEN
   ========================================================= */

#result-screen {

    display: none;

    text-align: center;
}


.result-card {

    width: 100%;

    padding: 35px 25px;

    border-radius: 24px;

    background: rgba(255,255,255,0.05);

    border: 1px solid rgba(255,255,255,0.1);

    box-shadow:
        0 20px 50px rgba(0,0,0,0.30);
}


.result-card h1 {

    margin-bottom: 20px;

    font-size: clamp(28px, 5vw, 42px);

    font-weight: 900;
}


#score {

    font-size: clamp(45px, 8vw, 72px);

    font-weight: 900;

    color: #f4d35e;
}


#percentage {

    margin-top: 5px;

    font-size: 25px;

    font-weight: 800;

    color: #ffffff;
}


#result-message {

    margin: 20px 0;

    font-size: 18px;

    line-height: 1.6;
}


/* =========================================================
   SOCIAL MESSAGE
   ========================================================= */

.social-message {

    display: block;

    margin: 25px 0;

    padding: 20px;

    border-radius: 16px;

    background: rgba(0,106,78,0.18);

    border: 1px solid rgba(0,106,78,0.35);

    color: #ffffff;

    font-size: 16px;

    line-height: 1.8;

    text-align: center;
}


/* =========================================================
   RESULT BUTTONS
   ========================================================= */

#result-screen button {

    width: 100%;

    min-height: 55px;

    padding: 14px 20px;

    border: none;

    border-radius: 14px;

    font-family: "Segoe UI", Arial, sans-serif;

    font-size: 18px;

    font-weight: 900;

    cursor: pointer;

    margin-top: 12px;

    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}


#result-screen button:hover {

    transform: translateY(-2px);

    box-shadow:
        0 8px 20px rgba(0,0,0,0.25);
}


/* Facebook button */

.facebook-btn,
#result-screen button[onclick*="returnToFacebook"] {

    background: #1877f2;

    color: #ffffff;
}


/* Play Again */

.play-again-btn,
#result-screen button[onclick*="reloadQuiz"] {

    background: #087f5b;

    color: #ffffff;
}


/* =========================================================
   STATUS
   ========================================================= */

.status {

    margin-top: 18px;

    font-size: 15px;

    color: #d8e5e2;
}


/* =========================================================
   MOBILE RESPONSIVE
   ========================================================= */

@media (max-width: 650px) {

    body {

        padding: 15px;

        align-items: flex-start;
    }


    main {

        margin-top: 15px;

        margin-bottom: 15px;
    }


    #start-screen {

        padding: 25px 12px;
    }


    .quiz-container {

        padding: 20px 16px;

        border-radius: 20px;
    }


    #options {

        grid-template-columns: 1fr;

        gap: 12px;
    }


    .option-btn {

        min-height: 62px;

        padding: 9px 14px;

        gap: 12px;

        font-size: 19px;
    }


    .option-letter {

        flex: 0 0 40px;

        width: 40px;

        height: 40px;

        font-size: 17px;
    }


    .option-text {

        font-size: 19px;

        line-height: 1.4;

        min-height: 40px;
    }


    #question {

        font-size: 23px;

        margin-bottom: 22px;
    }


    .next-btn {

        min-height: 58px;

        font-size: 19px;

        padding: 14px 18px;
    }


    #feedback {

        padding: 16px;
    }


    #example-text {

        font-size: 16px;
    }


    .result-card {

        padding: 28px 18px;
    }

}


/* =========================================================
   SMALL MOBILE
   ========================================================= */

@media (max-width: 400px) {

    body {

        padding: 10px;
    }


    .quiz-container {

        padding: 17px 12px;
    }


    .quiz-top {

        gap: 8px;
    }


    .question-counter {

        font-size: 14px;
    }


    .timer-box {

        min-width: 46px;

        height: 38px;

        font-size: 16px;
    }


    .option-btn {

        min-height: 58px;

        padding: 8px 11px;

        gap: 10px;

        font-size: 18px;
    }


    .option-letter {

        flex: 0 0 36px;

        width: 36px;

        height: 36px;

        font-size: 16px;
    }


    .option-text {

        font-size: 18px;

        min-height: 36px;
    }


    .next-btn {

        min-height: 55px;

        font-size: 18px;
    }

}


/* =========================================================
   END OF CSS
   ========================================================= */

/* =========================================================
   CHAPTER NAVIGATION
   ========================================================= */
.top-navigation{margin-top:24px;display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.top-navigation a,.nav-btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border-radius:12px;padding:12px 16px;font-weight:800;font-size:15px;transition:transform .2s ease,box-shadow .2s ease}
.top-navigation a{color:#d8e5e2;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06)}
.top-navigation a:hover,.nav-btn:hover{transform:translateY(-2px);box-shadow:0 7px 18px rgba(0,0,0,.22)}
.result-navigation{display:grid;gap:10px;margin-top:16px}
.nav-btn{width:100%;min-height:50px}
.level-btn{background:#006a4e;color:#fff}.levels-btn{background:#334155;color:#fff}.home-btn{background:#7c3aed;color:#fff}