:root {
    --pct-primary: #1e40af;
    --pct-primary-hover: #1d4ed8;
    --pct-primary-light: #eff6ff;
    --pct-success: #065f46;
    --pct-success-bg: #ecfdf5;
    --pct-text-main: #1f2937;
    --pct-text-muted: #6b7280;
    --pct-border: #e5e7eb;
    --pct-bg-card: #ffffff;
    --pct-radius: 12px;
    --pct-transition: all 0.3s ease;
}

.pct-calculator-wrapper {
    max-width: 650px;
    margin: 2rem auto;
    padding: 2.5rem;
    background: var(--pct-bg-card);
    border-radius: var(--pct-radius);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--pct-text-main);
    border: 1px solid var(--pct-border);
}

.pct-calculator-header {
    text-align: center;
    margin-bottom: 2rem;
}

.pct-calculator-header h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.75rem;
    color: var(--pct-primary);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.pct-calculator-header p {
    margin: 0;
    color: var(--pct-text-muted);
    font-size: 0.95rem;
}

/* Tabs Navigation Layout */
.pct-tabs-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    background: #f3f4f6;
    padding: 0.35rem;
    border-radius: var(--pct-radius);
    margin-bottom: 2rem;
}

.pct-tab-btn {
    background: transparent;
    border: none;
    padding: 0.75rem 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--pct-text-muted);
    cursor: pointer;
    border-radius: calc(var(--pct-radius) - 4px);
    transition: var(--pct-transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.pct-tab-btn i {
    font-size: 1.1rem;
}

.pct-tab-btn:hover {
    color: var(--pct-primary);
    background: rgba(255, 255, 255, 0.5);
}

.pct-tab-btn.active {
    background: var(--pct-bg-card);
    color: var(--pct-primary);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* Tab Panels Visibility Execution */
.pct-tab-panel {
    display: none;
    animation: pctFadeIn 0.4s ease forwards;
}

.pct-tab-panel.active {
    display: block;
}

.pct-tab-panel h3 {
    font-size: 1.15rem;
    margin: 0 0 1.25rem 0;
    color: var(--pct-text-main);
    font-weight: 600;
}

/* Input Fields Grid Architecture */
.pct-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.pct-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pct-input-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--pct-text-main);
}

.pct-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.pct-field {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--pct-border);
    border-radius: 8px;
    font-size: 1.05rem;
    transition: var(--pct-transition);
    background-color: #f9fafb;
}

.pct-field:focus {
    outline: none;
    border-color: var(--pct-primary);
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.15);
}

.pct-input-wrapper .pct-addon {
    position: absolute;
    right: 1rem;
    font-weight: 600;
    color: var(--pct-text-muted);
}

/* Configuration Controls Setup */
.pct-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1.5rem;
}

.pct-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--pct-transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid transparent;
}

.pct-btn-secondary {
    background: #f3f4f6;
    color: var(--pct-text-main);
    border-color: var(--pct-border);
}

.pct-btn-secondary:hover {
    background: #e5e7eb;
}

/* Interactive Output Result Card Module */
.pct-result-card {
    background: var(--pct-primary-light);
    border: 1px solid rgba(30, 64, 175, 0.15);
    border-radius: var(--pct-radius);
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    position: relative;
    transform: translateY(0);
    transition: var(--pct-transition);
}

.pct-result-card.hidden {
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
}

.pct-result-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--pct-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.pct-result-info {
    flex-grow: 1;
}

.pct-result-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--pct-primary);
    font-weight: 700;
    display: block;
    margin-bottom: 0.2rem;
}

.pct-result-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--pct-text-main);
    line-height: 1.2;
}

.pct-result-formula {
    font-size: 0.85rem;
    color: var(--pct-text-muted);
    margin-top: 0.35rem;
    font-style: italic;
}

/* State Modification Accent Colors */
.pct-result-card.pct-style-success {
    background: var(--pct-success-bg);
    border-color: rgba(6, 95, 70, 0.2);
}
.pct-result-card.pct-style-success .pct-result-icon {
    background: #047857;
}
.pct-result-card.pct-style-success .pct-result-label {
    color: var(--pct-success);
}

.pct-result-card.pct-style-danger {
    background: #fef2f2;
    border-color: rgba(153, 27, 27, 0.2);
}
.pct-result-card.pct-style-danger .pct-result-icon {
    background: #dc2626;
}
.pct-result-card.pct-style-danger .pct-result-label {
    color: #991b1b;
}

/* Action Control Icons */
.pct-copy-btn {
    background: #ffffff;
    border: 1px solid var(--pct-border);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--pct-text-muted);
    cursor: pointer;
    transition: var(--pct-transition);
}

.pct-copy-btn:hover {
    color: var(--pct-primary);
    border-color: var(--pct-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.pct-copy-btn.copied {
    background: #059669;
    color: #ffffff;
    border-color: #059669;
}

/* Structural Layout Animations */
@keyframes pctFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Adaptive CSS Breakpoints */
@media (max-width: 600px) {
    .pct-calculator-wrapper {
        padding: 1.5rem 1.25rem;
        margin: 1rem;
    }
    .pct-tabs-nav {
        grid-template-columns: repeat(2, 1fr);
    }
    .pct-input-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .pct-result-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
        padding: 1.25rem;
    }
    .pct-copy-btn {
        position: absolute;
        top: 1.25rem;
        right: 1.25rem;
    }
}