/* карточка калькулятора — светлая, воздушная */
.fuel-card {
    max-width: 620px;
    width: 100%;
    background: #ffffff;
    border-radius: 2rem;
    box-shadow:
        0 20px 40px -12px rgba(0, 0, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: transform 0.2s ease;
}

.fuel-card:hover {
    transform: translateY(-3px);
}

/* шапка */
.card-header {
    background: #1a2a3a;
    padding: 1.5rem 1.8rem;
    color: white;
}

.card-header h1 {
    font-size: 1.7rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.card-header h1 i {
    font-size: 1.6rem;
    color: #ffb347;
}

.card-header p {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-top: 0.4rem;
}

/* основное тело */
.card-body {
    padding: 2rem 1.8rem 1.8rem 1.8rem;
}

/* стили групп инпутов */
.input-group {
    margin-bottom: 1.8rem;
    display: flex;
    flex-direction: column;
    /* display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 0.5rem; */
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #2c3e4e;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-group label i {
    width: 1.4rem;
    color: #2c6e9e;
    font-size: 1rem;
}

/* поле ввода — красивое, с отступами, живое */
.input-group input {
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    font-family: monospace, "Courier New", system-ui;
    font-weight: 500;
    background: #fefefe;
    border: 2px solid #e2edf7;
    border-radius: 1.2rem;
    transition: all 0.2s ease;
    color: #1e2f3f;
    outline: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.input-group input:focus {
    border-color: #f1b24a;
    box-shadow: 0 0 0 4px rgba(241, 178, 74, 0.2);
    background-color: #fffef7;
}

.input-group input:hover {
    border-color: #cbdde9;
    background-color: #ffffff;
}

/* подсказки под инпутами */
.input-hint {
    font-size: 0.7rem;
    color: #6c86a3;
    margin-top: 0.4rem;
    margin-left: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* блок с результатами — красивый, сразу обновляется */
.results-panel {
    background: #f8fafc;
    border-radius: 1.2rem;
    padding: 1.2rem 1.3rem;
    margin: 1rem 0 0.8rem 0;
    border: 1px solid #eef3fc;
    box-shadow:
        inset 0 1px 2px #ffffff,
        0 4px 8px rgba(0, 0, 0, 0.02);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.7rem 0;
    border-bottom: 1px dashed #dee9f2;
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    font-weight: 600;
    color: #2c3e50;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-value {
    font-weight: 700;
    font-size: 1.3rem;
    font-family: monospace;
    color: #1f6392;
    background: #eef3fc;
    padding: 0.2rem 0.7rem;
    border-radius: 2rem;
    letter-spacing: 0.5px;
}

.total-fuel {
    background: #e9f3fa;
    margin-top: 0.5rem;
    border-radius: 1rem;
}
.main-result {
    display: grid;
    grid-template-columns: auto auto;
    gap: 0.5rem;
}
.total-fuel .result-label {
    font-size: 1rem;
    font-weight: 800;
    color: #1a3b4e;
}

.total-fuel .result-value {
    font-size: 1.6rem;
    background: #f1b24a20;
    color: #c96f0e;
    font-weight: 800;
}

/* дополнительная инфо */
.note {
    font-size: 0.7rem;
    text-align: center;
    color: #6b8fae;
    margin-top: 1.2rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    border-top: 1px solid #e2edf4;
    padding-top: 1rem;
}

.note i {
    font-size: 0.65rem;
}

/* небольшие адаптивные правки */
@media (max-width: 450px) {
    .card-body {
        padding: 1.5rem;
    }
    .result-value {
        font-size: 1rem;
        padding: 0.2rem 0.5rem;
    }
    .total-fuel .result-value {
        font-size: 1.3rem;
    }
}

/* кнопка сброса — аккуратная, но не доминирует */
.buttons-area {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
}
.btn-reset {
    background: none;
    border: 1px solid #cddfec;
    padding: 0.4rem 1rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: #54738f;
    cursor: pointer;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}
.btn-reset:hover {
    background: #eef3fc;
    border-color: #9bb7d0;
    color: #2c577c;
}