.meters_training {
    align-items: center;
    gap: 24px;
    text-align: center;
}

.meters_training [hidden] { display: none !important; }

.meters_body {
    width: 100%;
    max-width: 620px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 28px;
}

.meters_lesson, .meters_task { width: 100%; }
.meters_task { padding-top: 88px; }
.meters_task.cube_training_feedback_host { overflow: visible; }
.meters_task > .cube_training_praise { top: 44px; }

.meters_rule_text {
    margin: 0;
    font-size: clamp(18px, 2vw, 23px);
    line-height: 1.6;
}

.meters_example {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin: 32px auto 24px;
    max-width: 540px;
}

.meters_segment {
    flex: 1;
    min-width: 0;
    color: var(--main_text);
    font-size: 24px;
    font-weight: var(--main_bolder_weight);
}

.meters_measure {
    height: 36px;
    margin: 12px 0;
    border: 2px solid var(--orange);
    border-bottom-width: 4px;
    border-radius: 6px;
    background: var(--yellow);
}

.meters_example_sum {
    margin: 0;
    font-size: clamp(19px, 2.3vw, 27px);
    font-weight: var(--main_bolder_weight);
    line-height: 1.5;
}

.meters_equation {
    margin: 0 0 40px;
    font-family: 'Open Sans', sans-serif;
    font-size: clamp(34px, 5.5vw, 60px);
    font-weight: 700;
    line-height: 1.5;
    white-space: nowrap;
}

.meters_equation > span { color: var(--blue3); }

.meters_blank {
    display: inline-block;
    width: var(--meters-answer-width, 4ch);
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.meters_options {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.meters_option.btn {
    min-width: 0;
    min-height: 88px;
    padding: 12px 8px;
    color: var(--main);
    font-family: 'Open Sans', sans-serif;
    font-size: clamp(24px, 3vw, 38px);
    font-weight: 700;
    font-style: normal;
    line-height: 1.2;
    text-transform: none;
}

.meters_training .meters_option.btn:disabled {
    color: var(--main) !important;
    opacity: 1;
}

.meters_option.correct_answered { background: rgba(50, 191, 76, .12); border-color: var(--green); }
.meters_option.wrong_answered { background: rgba(246, 81, 29, .12); border-color: var(--red); }
.meters_option.correct_answered::before, .meters_option.wrong_answered::before { display: none; }

.meters_feedback {
    min-height: 74px;
    margin-top: 26px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    font-size: 20px;
    line-height: 1.5;
}

.meters_feedback strong { color: var(--green); }
.meters_feedback[data-kind="wrong"] strong { color: var(--red); }
.meters_inverse .meters_feedback { min-height: 104px; }

.meters_continue { max-width: 360px; }

.meters_actions {
    width: 100%;
    max-width: 360px;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
}

.meters_actions .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--accent);
}

.meters_actions svg { width: 20px; height: 20px; flex: 0 0 20px; }

@media (max-width: 767px) {
    .main_wrapper.meters_layout { min-height: calc(100svh - var(--nav_height)); }
    .training_fullscreen .main_wrapper.meters_layout { min-height: 100svh; }
}

@media (max-width: 600px) {
    .meters_training { gap: 20px; }
    .meters_body { gap: 22px; }
    .meters_options { gap: 10px; }
    .meters_option.btn { min-height: 76px; font-size: clamp(21px, 6.4vw, 25px); }
    .meters_equation { margin-bottom: 28px; }
    .meters_feedback { margin-top: 20px; font-size: 18px; }
    .meters_actions .btn { padding-left: 10px; padding-right: 10px; }
    .meters_segment { font-size: 21px; }
    .meters_example { margin-top: 24px; }
}

@media (max-width: 360px) {
    .meters_inverse .meters_equation { font-size: 30px; }
}