/* === Калькулятор === */
.calc-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--bg-dark) 100%);
    padding: 4rem 0 3rem;
    color: #fff;
    text-align: center;
}

.calc-hero-title {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent);
    letter-spacing: -0.02em;
}

.calc-hero-subtitle {
    font-size: 1.0625rem;
    color: rgba(255,255,255,0.8);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.6;
}

.calc-main { padding: 2.5rem 0 6rem; background: var(--bg-alt); }

.calc-disclaimer {
    background: #fffbeb;
    border: 1px solid #fbbf24;
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: #92400e;
    line-height: 1.5;
}

.calc-sections { display: flex; flex-direction: column; gap: 1.5rem; }

/* --- Секция --- */
.calc-section {
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

.calc-section:hover { box-shadow: var(--shadow); }

.calc-section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition);
}

.calc-section-header:hover { background: var(--bg-alt); }

.calc-section-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-section-icon svg {
    width: 100%;
    height: 100%;
}

.calc-section-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary);
    flex: 1;
}

.calc-section-subtotal {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--accent);
    margin-right: 0.5rem;
    opacity: 0;
    transition: opacity var(--transition);
}

.calc-section-subtotal.visible { opacity: 1; }

.calc-section-toggle {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition), background var(--transition);
}

.calc-section-toggle svg {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
    transition: transform var(--transition);
}

.calc-section.open .calc-section-toggle svg { transform: rotate(180deg); }

.calc-section-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.calc-section.open .calc-section-body { max-height: 2000px; }

.calc-items { padding: 0 1.5rem 1.25rem; }

/* --- Позиция --- */
.calc-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 0;
    border-bottom: 1px solid var(--border);
}

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

.calc-item-info { flex: 1; min-width: 0; }

.calc-item-name {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
}

.calc-item-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.125rem;
}

.calc-item-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.calc-qty-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    transition: all var(--transition);
    line-height: 1;
}

.calc-qty-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.calc-qty-btn:active { transform: scale(0.95); }

.calc-qty-input {
    width: 56px;
    height: 36px;
    text-align: center;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--text);
    -moz-appearance: textfield;
}

.calc-qty-input::-webkit-outer-spin-button,
.calc-qty-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.calc-qty-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(27,42,74,0.1);
}

.calc-item-sum {
    min-width: 90px;
    text-align: right;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--primary);
    flex-shrink: 0;
    opacity: 0.4;
    transition: opacity var(--transition), color var(--transition);
}

.calc-item-sum.active { opacity: 1; color: var(--accent); }

/* --- Липкий итог --- */
.calc-sticky-total {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
    z-index: 999;
    padding: 0.875rem 0;
    transform: translateY(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.calc-sticky-total.visible { transform: translateY(0); }

.sticky-total-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.sticky-total-label {
    font-size: 0.9375rem;
    color: var(--text-muted);
    font-weight: 500;
}

.sticky-total-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.02em;
}

.sticky-total-actions { display: flex; gap: 0.75rem; align-items: center; }

.btn-reset {
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all var(--transition);
    font-family: inherit;
}

.btn-reset:hover { border-color: var(--text-muted); color: var(--text); }

.btn-send-calc { white-space: nowrap; }

/* --- Форма --- */
.calc-form-section {
    padding: 5rem 0;
    background: var(--bg);
}

.calc-form-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.calc-form-info h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.calc-form-info > p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.calc-summary {
    background: var(--bg-alt);
    border-radius: var(--radius);
    padding: 1.25rem;
    max-height: 320px;
    overflow-y: auto;
}

.calc-summary-empty {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
    padding: 1rem 0;
}

.calc-summary-items { list-style: none; padding: 0; margin: 0; }

.calc-summary-items li {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border);
    gap: 0.5rem;
}

.calc-summary-items li:last-child { border-bottom: none; }

.calc-summary-item-name { color: var(--text); flex: 1; }
.calc-summary-item-qty { color: var(--text-muted); white-space: nowrap; }
.calc-summary-item-sum { color: var(--primary); font-weight: 600; white-space: nowrap; min-width: 70px; text-align: right; }

.calc-summary-total {
    display: flex;
    justify-content: space-between;
    padding-top: 0.75rem;
    margin-top: 0.5rem;
    border-top: 2px solid var(--accent);
    font-weight: 700;
    font-size: 1rem;
}

.calc-summary-total-label { color: var(--text); }
.calc-summary-total-value { color: var(--primary); }

.calc-form-container {
    background: var(--bg);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.calc-form-privacy {
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.calc-form-privacy a { color: var(--primary); text-decoration: underline; }
.calc-form-privacy a:hover { color: var(--accent); }

/* --- Адаптивность --- */
@media (max-width: 1023px) {
    .calc-form-wrapper { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 767px) {
    .calc-hero { padding: 3rem 0 2rem; }
    .calc-main { padding: 1.5rem 0 5rem; }
    .calc-section-header { padding: 1rem 1.25rem; }
    .calc-items { padding: 0 1.25rem 1rem; }

    .calc-item {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .calc-item-info { flex-basis: 100%; }

    .calc-item-controls { margin-left: auto; }

    .calc-item-sum { min-width: 70px; }

    .sticky-total-inner { flex-wrap: wrap; justify-content: center; gap: 0.75rem; }
    .sticky-total-info { width: 100%; text-align: center; }
    .sticky-total-value { font-size: 1.25rem; }
    .sticky-total-actions { width: 100%; justify-content: center; }

    .calc-form-section { padding: 3.5rem 0; }
    .calc-form-container { padding: 1.5rem; }
}

@media (max-width: 480px) {
    .calc-qty-btn { width: 32px; height: 32px; }
    .calc-qty-input { width: 48px; height: 32px; font-size: 0.875rem; }
}