* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    border: 0;
    font-size: 100%;
    vertical-align: baseline;
}

.course {
    max-width: 900px;
    margin: 0 auto;
    padding: 120px 20px 160px 20px;
    font-family: "Noto Sans", sans-serif;
    color: #333;
}

.quiz-intro {
    text-align: center;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    padding: 60px 40px;
    max-width: 700px;
    margin: 0 auto;
    transition: all 0.3s ease;
}

.quiz-intro h1 {
    font-size: 26px;
    font-weight: 600;
    color: #222;
    margin-bottom: 18px;
}

.quiz-intro p {
    color: #555;
    font-size: 17px;
    font-weight: 400;
    line-height: 1.6;
    margin-bottom: 40px;
}

.start-btn {
    background-color: #61d465;
    color: #ffffff;
    border: none;
    border-radius: 30px;
    padding: 14px 30px;
    font-size: 17px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.start-btn:hover {
    background-color: #7ef282;
    color: #333;
}

.quiz-card {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-top: 40px;
    animation: fadeIn 0.4s ease;
}

.quiz-card h1 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 16px;
}

.quiz-card .material {
    background: #f9f9f9;
    border-left: 4px solid #61d465;
    padding: 12px 18px;
    margin-bottom: 18px;
    color: #444;
    border-radius: 6px;
    line-height: 1.5;
}

.quiz-card .question {
    color: #444;
    font-size: 17px;
    font-weight: 500;
    margin-bottom: 14px;
}

.answers {
    list-style: none;
    padding: 0;
}

.answer-option {
    background: #f4f4f4;
    border-radius: 8px;
    margin-bottom: 12px;
    padding: 14px 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
    font-size: 16px;
    line-height: 1.4;
}

.answer-option:hover {
    background: #e8f5e9;
}

.answer-option.correct {
    background: #b7ffb9;
    color: #333;
    border-color: #61d465;
}

.answer-option.wrong {
    background: #ffcdd2;
    color: #333;
    border-color: #e57373;
}

.feedback {
    margin-top: 25px;
    color: #555;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
}

.feedback-correct {
    color: #2e7d32;
    font-weight: 600;
}

.feedback-wrong {
    color: #c62828;
    font-weight: 600;
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

.nav-btn {
    background-color: #61d465;
    color: #ffffff;
    padding: 10px 22px;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
}

.nav-btn:hover {
    background-color: #7ef282;
    color: #333;
}

.nav-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

.quiz-result {
    display: none;
    margin-top: 80px;
    text-align: center;
}

.quiz-result.active {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    animation: fadeIn 0.6s ease;
}

.quiz-result-content {
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
    padding: 50px 60px 60px 60px;
    max-width: 720px;
    width: 100%;
    display: flex;
    flex-direction: column;
    text-align: center;
    line-height: 1.7;
}

.quiz-result-content h1 {
    font-size: 28px;
    font-weight: 700;
    color: #1f1f1f;
    margin-bottom: 18px;
}

.quiz-result-content p {
    color: #555;
    font-size: 17px;
    margin-bottom: 16px;
}

.quiz-result-content h2 {
    font-size: 22px;
    color: #333;
    margin-top: 20px;
    margin-bottom: 10px;
}

.mistakes-block {
    background: #fefefe;
    border-radius: 12px;
    border-left: 5px solid #61d465;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    padding: 25px 28px;
    margin: 40px auto 0 auto;
    max-width: 600px;
    text-align: left;
    transition: all 0.3s ease;
}

.mistakes-block:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
}

.mistakes-block h3 {
    font-size: 19px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
    border-bottom: 1px solid #e5e5e5;
    padding-bottom: 8px;
}

.mistakes-block li {
    margin-bottom: 18px;
    line-height: 1.6;
}

.mistakes-block strong {
    color: #222;
}

.mistakes-block .wrong {
    color: #d32f2f;
    font-weight: 500;
}

.mistakes-block .correct {
    color: #2e7d32;
    font-weight: 500;
}

.return-btn {
    background-color: #61d465;
    color: #fff;
    padding: 14px 34px;
    border-radius: 30px;
    margin-top: 60px;
    align-self: center;
    font-size: 17px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.return-btn:hover {
    background-color: #7ef282;
    color: #222;
}

.quiz-gif {
    margin: 24px 0 18px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.quiz-gif img {
    max-width: 100%;
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
}

/* === АНИМАЦИЯ === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Планшеты горизонтальные (до 1024px) */
@media (max-width: 1024px) {
    .course {
        padding: 200px 20px 200px 20px;
    }

    .quiz-intro {
        padding: 50px 35px;
    }

    .quiz-intro h1 {
        font-size: 24px;
    }

    .quiz-card h1 {
        font-size: 20px;
    }

    .quiz-result-content {
        padding: 40px 45px 50px 45px;
    }
}

/* Планшеты вертикальные (до 900px) */
@media (max-width: 900px) {
    .course {
        padding: 200px 20px 200px 20px;
    }

    .quiz-intro {
        padding: 45px 30px;
    }

    .quiz-intro h1 {
        font-size: 22px;
    }

    .quiz-intro p {
        font-size: 16px;
    }

    .quiz-card {
        padding: 25px;
    }

    .quiz-card .question {
        font-size: 16px;
    }

    .answer-option {
        font-size: 15.5px;
    }

    .quiz-result-content h1 {
        font-size: 26px;
    }

    .quiz-result-content p {
        font-size: 16px;
    }
}

/* Смартфоны большие (до 768px) */
@media (max-width: 768px) {
    .course {
        padding: 200px 20px 200px 20px;
    }

    .quiz-intro {
        padding: 40px 25px;
    }

    .quiz-intro h1 {
        font-size: 21px;
    }

    .quiz-intro p {
        font-size: 15px;
        margin-bottom: 30px;
    }

    .start-btn {
        padding: 12px 26px;
        font-size: 16px;
    }

    .quiz-card {
        margin-top: 30px;
        padding: 22px;
    }

    .answer-option {
        font-size: 15px;
        padding: 12px 16px;
    }

    .nav-btn {
        font-size: 15px;
        padding: 9px 20px;
    }

    .quiz-result-content {
        padding: 35px 30px 45px;
    }

    .quiz-result-content h1 {
        font-size: 24px;
    }

    .mistakes-block {
        padding: 20px 22px;
        max-width: 95%;
    }
}

/* Смартфоны малые (до 576px) */
@media (max-width: 576px) {
    .course {
        padding: 200px 20px 200px 20px;
    }

    .quiz-intro {
        padding: 35px 22px;
    }

    .quiz-intro h1 {
        font-size: 20px;
    }

    .quiz-intro p {
        font-size: 14.5px;
        line-height: 1.6;
    }

    .quiz-card h1 {
        font-size: 18px;
    }

    .quiz-card .question {
        font-size: 15px;
    }

    .answer-option {
        font-size: 14.5px;
        padding: 10px 14px;
    }

    .quiz-result-content {
        padding: 30px 25px 40px;
    }

    .quiz-result-content h1 {
        font-size: 22px;
    }

    .quiz-result-content p {
        font-size: 15px;
    }

    .mistakes-block h3 {
        font-size: 17px;
    }

    .return-btn {
        padding: 12px 28px;
        font-size: 15.5px;
    }
}

/* Супермалые экраны (до 400px) */
@media (max-width: 400px) {
    .course {
        padding: 200px 20px 200px 20px;
    }

    .quiz-intro h1 {
        font-size: 19px;
    }

    .quiz-intro p {
        font-size: 13.5px;
    }

    .quiz-card {
        padding: 18px;
    }

    .quiz-card h1 {
        font-size: 17px;
    }

    .answer-option {
        font-size: 13.5px;
        padding: 9px 12px;
    }

    .nav-btn {
        font-size: 14px;
        padding: 8px 18px;
    }

    .quiz-result-content h1 {
        font-size: 20px;
    }

    .quiz-result-content p {
        font-size: 14px;
    }

    .mistakes-block {
        padding: 18px;
    }

    .mistakes-block h3 {
        font-size: 16px;
    }

    .return-btn {
        font-size: 14.5px;
        padding: 11px 25px;
    }
}



@supports (-webkit-touch-callout: none) {
    html, body {
        margin: 0 !important;
        padding: 0 !important;
        padding-top: env(safe-area-inset-top) !important;
        margin-top: 20px;
    }

    main.course {
        margin-top: 0 !important;
        padding-top: 0 !important;
        margin-top: 20px !important;
    }

    .quiz-intro {
        margin-top: 0 !important;
        padding-top: 0 !important;
        margin-top: 20px !important;
    }
}