.pet-ration-calculator-final {
    position: relative;
    max-width: 650px;
    margin: 2rem auto;
    background: var(--color-surface, #fff);
    border-radius: 2rem;
    padding: 2.5rem;
    box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.08);
    color: var(--color-text, #334155);
    border: 1px solid var(--color-border, #f1f5f9);
    min-height: 400px;
}

.calc-loader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-surface, #fff);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 2rem;
    z-index: 50;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.4s;
}

.theme-dark .pet-ration-calculator-final {
    background: var(--color-surface-dark, #1e293b);
    color: var(--color-text-dark, #e2e8f0);
    border-color: var(--color-border-dark, #334155);
    box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.3);
}

.theme-dark .calc-loader {
    background: var(--color-surface-dark, #1e293b);
}

.calc-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-spinner {
    width: 3rem;
    height: 3rem;
    color: var(--color-accent, #f59e0b);
    animation: spin-pulse 2s infinite linear;
}

@keyframes spin-pulse {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.calc-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    animation: fade-in-up 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    font-size: 1.1rem;
    font-weight: 950;
    color: var(--color-heading, #0f172a);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.theme-dark .section-title {
    color: var(--color-heading-dark, #f8fafc);
}

.calc-section {
    border-bottom: 1px dashed var(--color-border-dashed, #e2e8f0);
    padding-bottom: 2rem;
}

.calc-section:last-of-type {
    border-bottom: none;
}

.theme-dark .calc-section {
    border-bottom-color: var(--color-border-dark, #334155);
}

.input-item {
    margin-bottom: 2rem;
}

.item-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--color-label, #94a3b8);
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}

.species-selector-v2 {
    display: flex;
    gap: 1rem;
}

.species-selector-v2 input {
    display: none;
}

.btn-species {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.25rem 0.75rem;
    background: var(--color-btn-bg, #f8fafc);
    border: 2px solid var(--color-btn-border, #e2e8f0);
    border-radius: 1rem;
    cursor: pointer;
    font-weight: 800;
    font-size: 1rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-dark .btn-species {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
}

.icon-v2 {
    width: 1.5rem;
    height: 1.5rem;
}

.species-selector-v2 input:checked + .btn-species {
    background: var(--color-surface, #fff);
    border-color: var(--color-accent, #f59e0b);
    color: var(--color-accent, #f59e0b);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.15);
    transform: translateY(-2px);
}

.theme-dark .species-selector-v2 input:checked + .btn-species {
    background: var(--color-surface-elevated-dark, #1e293b);
}

.segmented-v2 {
    display: flex;
    background: var(--color-btn-bg, #f8fafc);
    padding: 6px;
    border-radius: 1rem;
    border: 1px solid var(--color-btn-border, #e2e8f0);
}

.theme-dark .segmented-v2 {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
}

.segmented-v2 input {
    display: none;
}

.segmented-v2 label {
    flex: 1;
    text-align: center;
    padding: 0.85rem;
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.85rem;
    transition: all 0.2s;
    color: var(--color-muted, #64748b);
}

.segmented-v2 input:checked + label {
    background: var(--color-accent, #f59e0b);
    color: var(--color-on-accent, #fff);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.val-badge {
    font-weight: 950;
    color: var(--color-accent, #f59e0b);
    font-size: 1.25rem;
}

.label-row-v2 {
    display: flex;
    justify-content: space-between;
}

.range-v2 {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--color-range-track, #e2e8f0);
    border-radius: 10px;
}

.theme-dark .range-v2 {
    background: var(--color-range-track-dark, #334155);
}

.range-v2::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 26px;
    height: 26px;
    background: var(--color-surface, #fff);
    border: 6px solid var(--color-accent, #f59e0b);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.ratio-presets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.ratio-presets input {
    display: none;
}

.ratio-presets label {
    padding: 0.85rem;
    text-align: center;
    background: var(--color-btn-bg, #f8fafc);
    border: 1px solid var(--color-btn-border, #e2e8f0);
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.theme-dark .ratio-presets label {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
}

.ratio-presets input:checked + label {
    background: var(--color-surface, #fff);
    border-color: var(--color-accent, #f59e0b);
    color: var(--color-accent, #f59e0b);
    box-shadow: 0 4px 10px rgba(245, 158, 11, 0.1);
}

.theme-dark .ratio-presets input:checked + label {
    background: var(--color-surface-elevated-dark, #1e293b);
}

.custom-ratio-link {
    display: block;
    text-align: right;
    font-size: 0.75rem;
    color: var(--color-label, #94a3b8);
    margin-top: 1rem;
    cursor: pointer;
    text-decoration: underline;
}

.manual-slider-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--color-btn-bg, #f8fafc);
    border-radius: 1rem;
    border: 1px solid var(--color-btn-border, #e2e8f0);
}

.theme-dark .manual-slider-box {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
}

.ratio-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    margin-top: 1rem;
    font-weight: 700;
}

.results-v2 {
    background: var(--color-results-bg, #0f172a);
    border-radius: 2rem;
    padding: 2.5rem;
    color: var(--color-results-text, #fff);
    box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.3);
}

.theme-dark .results-v2 {
    background: var(--color-accent, #f59e0b);
    color: var(--color-results-text-dark, #0f172a);
    box-shadow: 0 20px 40px -10px rgba(245, 158, 11, 0.2);
}

.res-cards-v2 {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.res-card-v2 {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    border-left: 4px solid var(--color-accent, #f59e0b);
    padding: 0.5rem 1.5rem;
}

.theme-dark .res-card-v2 {
    border-left-color: var(--color-results-bg, #0f172a);
}

.res-tag {
    font-size: 0.8rem;
    font-weight: 900;
    text-transform: uppercase;
    color: var(--color-accent, #f59e0b);
    margin-bottom: 0.25rem;
    align-self: flex-start;
}

.theme-dark .res-tag {
    color: var(--color-results-bg, #0f172a);
    opacity: 0.7;
}

.res-num {
    font-size: 4rem;
    font-weight: 950;
    line-height: 1;
    align-self: flex-start;
}

.res-num small {
    font-size: 1.25rem;
    margin-left: 4px;
    opacity: 0.6;
}

.res-footer-v2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.theme-dark .res-footer-v2 {
    border-top-color: rgba(0, 0, 0, 0.1);
}

.total-info {
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.total-info strong {
    font-size: 1.4rem;
}

.footer-icon {
    width: 1.5rem;
    height: 1.5rem;
}

.status-box-v2 {
    background: var(--color-accent, #f59e0b);
    color: var(--color-on-accent, #fff);
    padding: 0.4rem 1.25rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 900;
}

.theme-dark .status-box-v2 {
    background: var(--color-results-bg, #0f172a);
    color: var(--color-results-text, #fff);
}

@media (max-width: 600px) {
    .pet-ration-calculator-final {
        padding: 1.5rem;
        margin: 1rem;
    }

    .species-selector-v2 {
        flex-direction: column;
    }

    .res-cards-v2 {
        flex-direction: column;
    }

    .res-footer-v2 {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}