/* The shared progress gate in training.css is limited to the exercise card. */
body:not(.fraction-roots-ready) .progress-ring-value { transition: none !important; }

.main_wrapper,
.training {
    min-height: 660px;
}

.fraction_roots[hidden] {
    display: none;
}

.fraction_roots {
    padding: 28px;
    justify-content: flex-start;
}

.fr_body {
    display: flex;
    flex-direction: column;
    gap: 22px;
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
}

.fr_levels {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.fr_level {
    min-height: 60px;
    white-space: normal;
    line-height: 1.35;
    padding: 10px 12px;
}

.fr_level.is_selected {
    background: var(--secondary_background);
    color: var(--main);
    border-color: var(--secondary);
    box-shadow: inset 0 0 0 1px var(--secondary);
}

.fr_rule {
    padding: 14px 18px;
    border-radius: 10px;
    background: var(--secondary_background);
    text-align: left;
    font-size: 15px;
    line-height: 1.6;
}

.fr_rule summary {
    cursor: pointer;
    font-weight: var(--main_bold_weight);
}

.fr_rule summary:focus-visible,
.fr_level:focus-visible,
.fr_check:focus-visible {
    outline: 2px solid #858585;
    outline-offset: 3px;
}

.fr_rule p {
    margin: 12px 0;
}

.fr_rule_example,
.fr_solution_steps > div {
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
}

.fr_task {
    margin: 0;
    text-align: center;
    font-weight: var(--main_bold_weight);
    font-size: 20px;
}

.fr_form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.fr_equation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    width: 100%;
    padding: 8px 0;
}

.fr_question {
    min-width: 0;
    max-width: 48%;
    overflow-x: auto;
    overflow-y: hidden;
    font-size: clamp(24px, 2.8vw, 32px);
}

.fr_equals {
    font-size: 32px;
}

.fr_field {
    display: flex;
    flex-direction: column;
    gap: 7px;
    width: 220px;
    max-width: 48%;
    min-width: 0;
}

.fr_field label {
    color: var(--secondary);
    text-align: center;
    font-size: 13px;
    font-weight: var(--main_bold_weight);
    line-height: 18px;
    cursor: text;
}

.fr_field input[type="text"] {
    box-sizing: border-box;
    width: 100%;
    min-width: 0;
    height: 58px;
    padding: 10px 12px;
    border: 2px solid var(--lightgray);
    border-radius: 12px;
    background: var(--secondary_background);
    color: var(--main);
    font: inherit;
    font-size: 24px;
    font-weight: var(--main_bold_weight);
    line-height: 1.3;
    font-variant-numeric: tabular-nums;
    text-align: center;
    outline: none !important;
    box-shadow: none;
    transition: border-color 0.15s, background-color 0.15s, box-shadow 0.15s;
}

.fr_field input:hover:not(:focus):not(:disabled):not(:read-only):not(.is_wrong):not(.is_correct) {
    border-color: var(--lightgray_2);
}

.fr_field input:focus,
.fr_field input:focus-visible {
    border-color: #858585;
    background: var(--white);
    outline: none !important;
    box-shadow: 0 0 0 3px rgba(115, 115, 115, 0.14);
}

.fr_field input.is_wrong {
    border-color: var(--red);
    background: var(--transp_red);
}

.fr_field input.is_correct {
    border-color: var(--green);
    background: var(--transp_green);
}

.fr_field input:disabled {
    cursor: default;
    opacity: 0.65;
}

.fr_note {
    min-height: 23px;
    color: var(--red);
    font-size: 15px;
    text-align: center;
}

.fr_note.is_correct {
    color: var(--green);
}

.fr_solution {
    box-sizing: border-box;
    width: 100%;
    max-width: 580px;
    padding: 14px 18px;
    border-radius: 10px;
    background: var(--secondary_background);
    font-size: 22px;
}

.fr_solution[hidden] {
    display: none;
}

.fr_solution_title {
    text-align: center;
    font-size: 15px;
    font-weight: var(--main_bold_weight);
}

.fr_check {
    width: 100%;
    max-width: 360px;
    min-height: 50px;
}

.fr_input_help {
    margin: 0;
    color: var(--secondary);
    font-size: 14px;
    line-height: 1.6;
    text-align: center;
}

.training_fullscreen .fraction_roots {
    overflow-y: auto;
    min-height: 0;
}

@media (max-width: 767px) {
    .fraction_roots {
        padding: 20px 12px;
    }

    .fr_body {
        gap: 18px;
    }

    .fr_levels {
        gap: 6px;
    }

    .fr_level {
        padding: 8px;
        font-size: 13px;
    }

    .fr_equation {
        gap: 10px;
    }

    .fr_question {
        font-size: 23px;
    }

    .fr_field input[type="text"] {
        font-size: 22px;
        padding: 8px;
    }

    .fr_rule {
        padding: 12px;
    }

    .fr_rule_example,
    .fr_solution_steps {
        font-size: 19px;
    }
}

@media (max-width: 479px) {
    .fr_levels {
        grid-template-columns: 1fr;
    }

    .fr_level {
        min-height: 44px;
    }
}