/* ========================================
   CORE CALCULATOR FRAMEWORK
   Переиспользуемые компоненты для всех калькуляторов
   ======================================== */

   
/* ---------- Базовый контейнер ---------- */
.calculator {
    --calc-primary: #f0620f;
    --calc-primary-dark: #cc4d17;
    --calc-bg: #1a1a1a;
    --calc-bg-card: #242424;
    --calc-bg-input: #121212;
    --calc-text: #e0e0e0;
    --calc-text-muted: #999;
    --calc-border: #333;
    --calc-border-light: #444;
    --calc-shadow: rgba(0, 0, 0, 0.3);
    --calc-radius: 12px;
    --calc-radius-sm: 8px;
    --calc-transition: 0.3s ease;

    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    color: var(--calc-text);
    font-family: system-ui, -apple-system, sans-serif;
}

/* ---------- Заголовки ---------- */
.calculator__title {
    text-align: center;
    color: var(--calc-primary);
    font-size: 1.8rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.calculator__subtitle {
    text-align: center;
    color: var(--calc-text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

/* ---------- Вкладки (операции) ---------- */
.calculator__tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 16px;
    background: var(--calc-bg-card);
    padding: 6px;
    border-radius: var(--calc-radius);
    border: 1px solid var(--calc-border);
}

.calculator__tab {
    padding: 10px 16px;
    border: none;
    border-radius: var(--calc-radius-sm);
    background: transparent;
    color: var(--calc-text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--calc-transition);
    text-align: center;
}

.calculator__tab:hover {
    color: var(--calc-text);
    background: rgba(255, 255, 255, 0.05);
}

.calculator__tab--active {
    background: var(--calc-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(240, 98, 15, 0.3);
}

.calculator__tab--active:hover {
    background: var(--calc-primary-dark);
}

/* ---------- Переключатель мм/дюймы ---------- */
.calculator__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px;
    background: var(--calc-bg-card);
    border-radius: var(--calc-radius);
    border: 1px solid var(--calc-border);
    margin-bottom: 16px;
}

.calculator__toggle-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--calc-text-muted);
}

.calculator__toggle-label--active {
    color: var(--calc-text);
}

/* Свитч */
.calculator__switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.calculator__switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.calculator__slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: #0a2e95;
    border-radius: 34px;
    transition: var(--calc-transition);
}

.calculator__slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background: white;
    border-radius: 50%;
    transition: var(--calc-transition);
}

.calculator__switch input:checked + .calculator__slider {
    background: var(--calc-primary);
}

.calculator__switch input:checked + .calculator__slider::before {
    transform: translateX(24px);
}

/* ---------- Панели параметров ---------- */
.calculator__panel {
    display: none;
    background: var(--calc-bg-card);
    padding: 20px;
    border-radius: var(--calc-radius);
    border: 1px solid var(--calc-border);
    margin-bottom: 16px;
    animation: calculatorFadeIn 0.25s ease;
}

.calculator__panel--active {
    display: block;
}

@keyframes calculatorFadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- Поля ввода ---------- */
.calculator__field {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.calculator__field:last-child {
    border-bottom: none;
}

.calculator__label {
    font-size: 0.95rem;
    color: var(--calc-text);
    font-weight: 400;
    flex: 1;
}

.calculator__label--small {
    font-size: 0.85rem;
    color: var(--calc-text-muted);
}

.calculator__input-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 140px;
}

.calculator__input {
    width: 100px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--calc-border);
    border-radius: var(--calc-radius-sm);
    background: var(--calc-bg-input);
    color: var(--calc-text);
    font-size: 0.95rem;
    transition: var(--calc-transition);
    text-align: right;
}

.calculator__input:focus {
    outline: none;
    border-color: var(--calc-primary);
    box-shadow: 0 0 0 3px rgba(240, 98, 15, 0.15);
}

.calculator__input::placeholder {
    color: var(--calc-text-muted);
    opacity: 0.5;
}

.calculator__input--small {
    width: 70px;
}

.calculator__unit {
    font-size: 0.8rem;
    color: var(--calc-text-muted);
    min-width: 40px;
}

/* ---------- Селекты ---------- */
.calculator__select {
    width: 140px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--calc-border);
    border-radius: var(--calc-radius-sm);
    background: var(--calc-bg-input);
    color: var(--calc-text);
    font-size: 0.9rem;
    cursor: pointer;
}

.calculator__select:focus {
    outline: none;
    border-color: var(--calc-primary);
}

/* ---------- Результаты ---------- */
.calculator__results {
    background: var(--calc-bg-card);
    padding: 20px;
    border-radius: var(--calc-radius);
    border: 1px solid var(--calc-border);
}

.calculator__result {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 1rem;
}

.calculator__result:last-child {
    border-bottom: none;
}

.calculator__result-label {
    color: var(--calc-text-muted);
}

.calculator__result-value {
    color: #00ffcc;
    font-weight: 600;
    font-size: 1.1rem;
    font-variant-numeric: tabular-nums;
}

.calculator__result--highlight .calculator__result-value {
    color: var(--calc-primary);
    font-size: 1.3rem;
}

.calculator__result--hidden {
    display: none;
}

/* ---------- Кнопки ---------- */
.calculator__button {
    padding: 10px 24px;
    border: none;
    border-radius: var(--calc-radius-sm);
    background: var(--calc-primary);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--calc-transition);
    width: 100%;
}

.calculator__button:hover {
    background: var(--calc-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(240, 98, 15, 0.3);
}

.calculator__button:active {
    transform: translateY(0);
}

/* ---------- Вспомогательные ---------- */
.calculator__divider {
    height: 1px;
    background: var(--calc-border);
    margin: 16px 0;
}

.calculator__hint {
    font-size: 0.8rem;
    color: var(--calc-text-muted);
    text-align: center;
    margin-top: 8px;
    opacity: 0.7;
}