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

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f7f6;
    color: #263b3a;
    min-height: 100vh;
}

.hidden {
    display: none !important;
}


/* HEADER */

.header {
    background: #ffffff;
    padding: 20px 7%;
    border-bottom: 1px solid #dbe4e2;

    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header h1 {
    color: #183f3d;
    font-size: 25px;
}

.header p {
    color: #72817f;
    margin-top: 4px;
}


/* TIMER */

.timer-box {
    background: #194d48;
    color: white;

    padding: 10px 24px;
    border-radius: 12px;

    text-align: center;

    display: flex;
    flex-direction: column;
}

.timer-box small {
    font-size: 10px;
    letter-spacing: 1px;
}

.timer-box strong {
    font-size: 24px;
    margin-top: 3px;
}

.timer-box.warning {
    background: #b4433c;
}


/* CONTAINER */

.container {
    width: min(1150px, 92%);
    margin: 45px auto;
}


/* START */

.start-card,
.result-card {
    max-width: 850px;

    margin: auto;

    padding: 45px;

    background: white;

    border-radius: 20px;

    box-shadow: 0 8px 30px rgba(0, 40, 35, 0.07);

    text-align: center;
}

.badge {
    display: inline-block;

    padding: 7px 14px;

    border-radius: 20px;

    background: #e4f1ed;
    color: #246b60;

    font-weight: bold;

    font-size: 12px;

    letter-spacing: 0.7px;

    margin-bottom: 18px;
}

.start-card h2 {
    font-size: 34px;
    color: #183f3d;
}

.subtitle {
    margin: 10px 0 30px;
    color: #70807d;
}


/* SUMMARY */

.summary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);

    gap: 15px;

    margin: 25px 0;
}

.summary-grid div {
    background: #f6f9f8;

    padding: 20px;

    border-radius: 12px;
}

.summary-grid strong {
    display: block;

    color: #246f64;

    font-size: 30px;
}

.summary-grid span {
    color: #74817f;
    font-size: 13px;
}


/* MODULES */

.module-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;

    gap: 18px;

    margin: 30px 0;
}

.module-info {
    text-align: left;

    padding: 23px;

    border: 2px solid #e1eae7;

    border-radius: 13px;
}

.module-info > span {
    font-size: 11px;
    font-weight: bold;
    color: #237064;
}

.module-info h3 {
    font-size: 22px;
    margin: 7px 0 10px;
}

.module-info p {
    color: #657572;
    margin-top: 5px;
}

.module-info small {
    display: block;
    margin-top: 10px;
    color: #9b7441;
}


/* INSTRUCTIONS */

.instructions {
    background: #f7f9f8;

    padding: 25px;

    border-radius: 12px;

    text-align: left;

    margin-bottom: 28px;
}

.instructions h3 {
    margin-bottom: 12px;
}

.instructions ul {
    padding-left: 22px;
}

.instructions li {
    color: #5e6e6b;
    margin: 7px 0;
    line-height: 1.5;
}


/* BUTTONS */

button {
    font-family: inherit;
}

.primary-btn {
    background: #267064;
    color: white;

    border: 0;
    border-radius: 9px;

    padding: 14px 27px;

    font-size: 15px;
    font-weight: bold;

    cursor: pointer;

    transition: 0.2s;
}

.primary-btn:hover {
    background: #19594f;
}

.secondary-btn {
    padding: 13px 22px;

    background: white;
    color: #315f59;

    border: 1px solid #a7bab7;

    border-radius: 9px;

    cursor: pointer;
}

button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}


/* TEST */

.test-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;

    margin-bottom: 15px;
}

.part-label {
    color: #267064;
    font-weight: bold;
    font-size: 12px;
    letter-spacing: 1px;
}

.question-counter {
    color: #6c7b79;
}


/* PROGRESS */

.progress {
    height: 7px;

    background: #dbe5e2;

    border-radius: 10px;

    overflow: hidden;

    margin-bottom: 25px;
}

#progressFill {
    height: 100%;
    width: 0;

    background: #358b7d;

    transition: width 0.3s;
}


/* TEST LAYOUT */

.test-layout {
    display: grid;

    grid-template-columns: 220px 1fr;

    gap: 25px;
}


/* NAVIGATOR */

.navigator {
    background: white;

    padding: 20px;

    border-radius: 15px;

    height: fit-content;

    box-shadow: 0 5px 20px rgba(0,0,0,0.04);
}

.navigator h3 {
    margin-bottom: 15px;
}

.question-navigator {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 7px;
}

.question-navigator button {
    height: 38px;

    background: white;

    border: 1px solid #ccd9d6;

    border-radius: 7px;

    cursor: pointer;
}

.question-navigator button.answered {
    background: #d8ece6;
    border-color: #77aa9e;
}

.question-navigator button.current {
    background: #246f63;
    border-color: #246f63;
    color: white;
}


/* KEY */

.key {
    border-top: 1px solid #e1e7e5;
    margin-top: 20px;
    padding-top: 12px;

    font-size: 12px;
    color: #687775;
}

.key p {
    margin: 7px 0;
}

.key-box {
    display: inline-block;

    width: 12px;
    height: 12px;

    border-radius: 3px;

    margin-right: 5px;
}

.current-key {
    background: #246f63;
}

.answered-key {
    background: #d8ece6;
}


/* QUESTION CARD */

.question-card {
    background: white;

    min-height: 465px;

    padding: 35px;

    border-radius: 15px;

    box-shadow: 0 5px 20px rgba(0,0,0,0.04);
}

.category {
    display: inline-block;

    padding: 6px 10px;

    background: #edf4f2;

    color: #31695f;

    border-radius: 5px;

    font-size: 12px;
    font-weight: bold;

    margin-bottom: 20px;
}

#questionText {
    font-size: 21px;

    line-height: 1.55;

    margin-bottom: 25px;
}


/* CHOICES */

#choices {
    display: grid;
    gap: 12px;
}

.choice {
    width: 100%;

    padding: 16px;

    border-radius: 10px;

    background: white;

    border: 2px solid #dfe7e5;

    cursor: pointer;

    font-size: 16px;

    text-align: left;

    transition: 0.15s;
}

.choice:hover {
    border-color: #72a99e;
}

.choice.selected {
    border-color: #276f63;
    background: #e3f0ec;
}


/* RESPONSE */

.student-response {
    margin-top: 20px;
}

.student-response label {
    display: block;

    margin-bottom: 8px;

    font-weight: bold;
}

.student-response input {
    width: 100%;

    padding: 14px;

    border: 2px solid #d4e0dd;

    border-radius: 8px;

    font-size: 18px;

    outline: none;
}

.student-response input:focus {
    border-color: #267064;
}


/* NAVIGATION */

.navigation-buttons {
    display: flex;
    justify-content: space-between;

    margin-top: 40px;
}

.submit-btn {
    display: block;

    margin: 25px 0 0 auto;

    padding: 13px 23px;

    border: 0;
    border-radius: 8px;

    background: #a16734;
    color: white;

    cursor: pointer;
}


/* MODULE COMPLETE */

.check,
.star {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 70px;
    height: 70px;

    margin: 0 auto 20px;

    border-radius: 50%;

    background: #dbeee8;
    color: #237064;

    font-size: 35px;
    font-weight: bold;
}

.adaptive-message {
    max-width: 550px;
    margin: 15px auto;

    color: #687775;
    line-height: 1.5;
}

.next-box {
    background: #f4f8f7;

    max-width: 350px;

    padding: 20px;

    border-radius: 12px;

    margin: 25px auto;
}

.next-box strong,
.next-box span {
    display: block;
}

.next-box span {
    color: #6e7e7b;
    margin-top: 6px;
}


/* RESULTS */

.score-circle {
    display: flex;
    flex-direction: column;
    justify-content: center;

    width: 160px;
    height: 160px;

    margin: 28px auto;

    border: 10px solid #dcebe7;

    border-radius: 50%;
}

.score-circle strong {
    color: #216c60;
    font-size: 46px;
}

.score-circle span {
    color: #73817e;
}

.result-grid {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 12px;

    margin: 30px 0;
}

.result-grid div {
    padding: 18px;

    background: #f3f7f6;

    border-radius: 10px;
}

.result-grid strong,
.result-grid span {
    display: block;
}

.result-grid span {
    margin-top: 5px;

    color: #72817e;

    font-size: 12px;
}


/* REVIEW */

.review-area {
    text-align: left;
    margin: 35px 0;
}

.review-area > h3 {
    margin-bottom: 15px;
}

.review-item {
    background: #f7f9f8;

    border-left: 4px solid #bf5148;

    border-radius: 5px;

    padding: 15px;

    margin: 10px 0;
}

.review-item.correct {
    border-left-color: #2d9173;
}

.review-item p {
    margin-top: 7px;
    line-height: 1.5;
}


/* FOOTER */

footer {
    padding: 30px;

    text-align: center;

    color: #82908e;

    font-size: 13px;
}


/* MOBILE */

@media (max-width: 800px) {

    .test-layout {
        grid-template-columns: 1fr;
    }

    .navigator {
        order: 2;
    }

    .question-card {
        order: 1;
    }

    .summary-grid,
    .module-grid,
    .result-grid {
        grid-template-columns: 1fr;
    }

    .start-card,
    .result-card {
        padding: 30px 20px;
    }

    .header {
        padding: 15px 4%;
    }

}