body {
    background: var(--bg-body);
    min-height: 100vh;
    padding: 0;
}

#calculator-main {
    padding: var(--spacing-2xl) var(--spacing-xl);
}

.calculator-container {
    max-width: 1200px;
    margin: 0 auto;
}

.calculator-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.calculator-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: var(--spacing-md);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.calculator-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1.4fr 0.6fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.step-by-row {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.step-by-row .step {
    flex: 1 1 200px;
    max-width: 300px;
    min-height: 100px;
}

@media (max-width: 1024px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }

    #calculator-main {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .calculator-header h1 {
        font-size: 1.6rem;
    }

    .calculator-header p {
        font-size: 0.95rem;
    }

    .input-section {
        padding: var(--spacing-md);
    }

    .tabs {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-sm);
    }

    .tab-btn {
        flex: 1 1 auto;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8rem;
        text-align: center;
        letter-spacing: 0;
    }

    .results-main {
        padding: var(--spacing-lg);
        grid-template-columns: 1fr;
    }

    .result-value {
        font-size: 1.5rem;
        word-break: break-word;
    }

    .result-formula {
        font-size: 0.75rem;
        overflow-x: auto;
    }

    .how-to-section {
        padding: var(--spacing-lg);
    }

    .how-to-section h2 {
        font-size: 1.15rem;
        flex-wrap: wrap;
    }

    .faq-section {
        padding: var(--spacing-lg);
    }

    .faq-section h2 {
        font-size: 1.15rem;
    }

    .faq-container {
        grid-template-columns: 1fr;
    }

    .unit-badge {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8rem;
    }

    .step-by-row {
        flex-direction: column;
    }

    .step-by-row .step {
        max-width: 100%;
        min-height: auto;
    }

    .step-by-step h4 {
        font-size: 0.95rem;
    }

    .step-by-step p {
        font-size: 0.85rem;
    }

    .disclaimer-box {
        padding: var(--spacing-lg);
    }

    .disclaimer-box h2 {
        font-size: 1.1rem;
    }

    .warning-box {
        padding: var(--spacing-md);
    }

    .info-box {
        padding: var(--spacing-md);
    }
}

/* Header Match Overrides */
.main-header .nav-link {
    opacity: 1 !important;
    font-weight: 600 !important;
}

.main-header .btn {
    text-transform: none !important;
    border-radius: 999px !important;
    width: auto !important;
    padding: 0.75rem 2rem !important;
    letter-spacing: normal !important;
}

@media (max-width: 480px) {
    body {
        padding: 0;
    }

    #calculator-main {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .calculator-header {
        margin-bottom: var(--spacing-xl);
    }

    .calculator-header h1 {
        font-size: 1.35rem;
    }

    .calculator-header p {
        font-size: 0.85rem;
    }

    .tabs {
        gap: 4px;
    }

    .tab-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.72rem;
    }

    .input-section {
        padding: var(--spacing-sm);
    }

    .input-section h2 {
        font-size: 0.95rem;
    }

    input[type="number"],
    input[type="text"],
    select {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .custom-select-trigger {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .input-wrapper {
        flex-wrap: wrap;
    }

    .unit-badge {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
        width: 100%;
        justify-content: center;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

    .results-main {
        padding: var(--spacing-md);
    }

    .result-value {
        font-size: 1.3rem;
    }

    .how-to-section {
        padding: var(--spacing-md);
    }

    .how-to-step {
        padding: var(--spacing-md);
    }

    .faq-section {
        padding: var(--spacing-md);
    }

    .faq-item {
        padding: var(--spacing-md);
    }

    .faq-item h3 {
        font-size: 0.9rem;
    }

    .disclaimer-box {
        padding: var(--spacing-md);
    }

    .disclaimer-box h2 {
        font-size: 1rem;
    }

    .disclaimer-box p {
        font-size: 0.85rem;
    }
}

.input-section {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-premium);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.input-section h2 {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-heading);
    font-size: 1.1rem;
    font-weight: 700;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 1024px) {
    .input-grid {
        grid-template-columns: 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.input-label {
    display: block;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.input-label .unit {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.85rem;
}

.input-wrapper {
    position: relative;
    display: flex;
    gap: var(--spacing-sm);
}

input[type="number"],
input[type="text"],
select {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid rgba(234, 88, 12, 0.45);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-family-base);
    background: var(--bg-card);
    color: var(--text-heading);
    transition: all var(--transition-fast);
}

::placeholder {
    color: #666 !important;
    opacity: 1;
}

:-ms-input-placeholder {
    color: #666 !important;
}

::-ms-input-placeholder {
    color: #666 !important;
}

#patientWeight,
#childWeight {
    padding-right: 70px;
}

input[type="number"]:hover,
input[type="text"]:hover,
select:hover {
    border-color: rgba(234, 88, 12, 0.5);
    box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.08);
    background: var(--bg-glass-strong);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-purple);
    background: var(--bg-glass-strong);
    box-shadow: 0 0 0 4px rgba(234, 88, 12, 0.15);
}

/* Custom dropdown wrapper */
.custom-select-wrapper {
    position: relative;
    flex: 1;
}

.custom-select-trigger {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid rgba(234, 88, 12, 0.2);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family-base);
    background: var(--bg-glass);
    color: var(--text-main);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.custom-select-trigger:hover {
    border-color: rgba(234, 88, 12, 0.5);
    box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.08);
    background: var(--bg-glass-strong);
}

.custom-select-wrapper.open .custom-select-trigger {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 4px rgba(234, 88, 12, 0.15);
    background: var(--bg-glass-strong);
}

.custom-select-trigger::after {
    content: '▾';
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-left: var(--spacing-sm);
}

.custom-select-options {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 2px solid rgba(234, 88, 12, 0.25);
    border-radius: var(--radius-sm);
    box-shadow: 0 8px 24px rgba(234, 88, 12, 0.15);
    z-index: 100;
    max-height: 220px;
    overflow-y: auto;
}

.custom-select-wrapper.open .custom-select-options {
    display: block;
}

.custom-select-option {
    padding: 10px var(--spacing-lg);
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-main);
    transition: background 0.15s ease, color 0.15s ease;
}

.custom-select-option:hover {
    background: rgba(234, 88, 12, 0.12);
    color: var(--accent-purple);
}

.custom-select-option.selected {
    background: var(--accent-purple);
    color: #ffffff;
    font-weight: 600;
}

.custom-select-option:first-child {
    border-radius: 10px 10px 0 0;
}

.custom-select-option:last-child {
    border-radius: 0 0 10px 10px;
}

.unit-badge {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(234, 88, 12, 0.1);
    border-radius: var(--radius-md);
    color: var(--accent-purple);
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.button-group .btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    width: 100%;
}

.button-group .btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(234, 88, 12, 0.4);
}

.button-group .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(234, 88, 12, 0.6);
}

.btn-secondary {
    background: rgba(234, 88, 12, 0.1);
    color: var(--accent-purple);
    border: 2px solid var(--accent-purple);
}

.btn-secondary:hover {
    background: rgba(234, 88, 12, 0.2);
}

.results-section {
    background: transparent;
    backdrop-filter: none;
    border: none;
    padding: 0;
    box-shadow: none;
    min-height: auto;
    overflow: visible;
    width: 100%;
    max-width: 100%;
    display: flex;
    align-items: center;
    position: sticky;
    top: var(--spacing-xl);
}

#weightBasedResults,
#ivRateResults,
#pediatricResults {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
    gap: var(--spacing-xl);
}

.results-main {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-premium);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    width: 100%;
    min-height: 400px;
    transition: all 0.3s ease;
}

.results-info {
    background: transparent;
    backdrop-filter: none;
    border: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    overflow: visible;
    max-height: none;
    min-width: 0;
    width: 100%;
    grid-column: 1 / -1;
}

.results-info>div {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.results-info .step-by-step,
.results-info .dose-range-info,
.results-info .alert-warning {
    width: 100%;
}

.result-item {
    background: linear-gradient(135deg, rgba(234, 88, 12, 0.05) 0%, rgba(112, 228, 219, 0.05) 100%);
    border: 1px solid rgba(234, 88, 12, 0.15);
    border-left: 4px solid var(--accent-purple);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.result-item:last-child {
    margin-bottom: 0;
}

.result-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-xs);
}

.result-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-purple);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.result-formula {
    font-size: 0.8rem;
    color: var(--text-main);
    line-height: 1.6;
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.03);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-cyan);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    width: 100%;
    min-height: 400px;
}

.empty-state-icon {
    font-size: 3.5rem;
}

.empty-state p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.info-box {
    background: rgba(112, 228, 219, 0.1);
    border-left: 4px solid var(--accent-cyan);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-2xl);
}

.info-box h3 {
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.info-box p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.tabs {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    border-bottom: 2px solid rgba(234, 88, 12, 0.2);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.tab-btn.active {
    color: var(--accent-purple);
    border-bottom-color: var(--accent-purple);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.warning-box {
    background: rgba(255, 212, 169, 0.2);
    border-left: 4px solid var(--accent-orange);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-xl);
}

.warning-box p {
    color: var(--text-main);
    font-size: 0.95rem;
    line-height: 1.6;
}

.step-by-step {
    background: linear-gradient(135deg, rgba(28, 28, 28, 0.95) 0%, rgba(34, 34, 34, 0.85) 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin: 0;
    border: 1px solid rgba(234, 88, 12, 0.2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    width: 100%;
    box-sizing: border-box;
}

.step-by-step h4 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.1rem;
    color: var(--text-heading);
    font-weight: 700;
    text-align: center;
}

.step {
    display: block;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid rgba(234, 88, 12, 0.15);
    border-radius: var(--radius-sm);
    width: 100%;
    box-sizing: border-box;
    overflow: visible;
}

.step:last-child {
    margin-bottom: 0;
}

.step-number {
    display: none;
}

.step-content {
    display: block;
    width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.step-content p {
    color: var(--text-main);
    font-size: 0.9rem;
    line-height: 1.4;
    margin: 0;
    display: block;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.step-code {
    font-family: 'Courier New', monospace;
    background: rgba(234, 88, 12, 0.1);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--accent-purple);
    line-height: 1.3;
    word-break: break-word;
}

.alert-danger {
    background: rgba(255, 107, 107, 0.15);
    border-left: 4px solid #FF6B6B;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: 0;
    border: 1px solid rgba(255, 107, 107, 0.3);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.15);
    border-left: 4px solid #FFC107;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: 0;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

.alert-danger p,
.alert-warning p {
    color: var(--text-main);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.4;
    word-break: break-word;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.checkbox-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-purple);
}

.checkbox-item label {
    cursor: pointer;
    color: var(--text-main);
    font-weight: 500;
    margin: 0;
}

.disclaimer-box {
    background: rgba(255, 152, 232, 0.1);
    border: 2px solid var(--accent-pink);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-3xl);
    text-align: center;
}

.disclaimer-box h2 {
    color: var(--accent-pink);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

.disclaimer-box p {
    color: var(--text-main);
    line-height: 1.8;
    margin: var(--spacing-sm) 0;
    font-size: 0.95rem;
}

.patient-conditions {
    background: var(--bg-glass);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.patient-conditions h4 {
    color: var(--text-heading);
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
}

.dose-range-info {
    background: linear-gradient(135deg, rgba(112, 228, 219, 0.08) 0%, rgba(200, 240, 240, 0.05) 100%);
    border-left: 4px solid var(--accent-cyan);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: 0;
    border: 1px solid rgba(112, 228, 219, 0.25);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dose-range-info p {
    color: var(--text-main);
    font-size: 0.9rem;
    margin: var(--spacing-sm) 0;
    line-height: 1.4;
    word-break: break-word;
}

.dose-range-info p:first-child {
    font-weight: 700;
    color: var(--text-heading);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.dose-range-info strong {
    color: var(--accent-cyan);
    font-weight: 700;
}

.how-to-section {
    background: var(--bg-glass);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.how-to-section h2 {
    color: var(--text-heading);
    font-size: 1.4rem;
    margin: 0 0 var(--spacing-2xl) 0;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.how-to-steps {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    overflow: visible;
}

.how-to-steps .how-to-step:nth-child(5) {
    grid-column: 1 / -1;
}

@media (max-width: 1024px) {
    .how-to-steps {
        grid-template-columns: 1fr;
    }
}

.how-to-step {
    background: linear-gradient(135deg, rgba(234, 88, 12, 0.08) 0%, rgba(234, 88, 12, 0.02) 100%);
    padding: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(234, 88, 12, 0.2);
    border-left: 5px solid var(--accent-purple);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
    position: relative;
    overflow: visible !important;
}

.how-to-step:hover {
    box-shadow: 0 8px 24px rgba(234, 88, 12, 0.15);
    transform: translateY(-2px);
}

.step-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    font-weight: 900;
    font-size: 1.3rem;
    margin-right: 10px;
    box-shadow: 0 4px 12px rgba(234, 88, 12, 0.4);
}

.faq-section {
    background: var(--bg-glass);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.faq-section h2 {
    color: var(--text-heading);
    font-size: 1.4rem;
    margin: 0 0 var(--spacing-2xl) 0;
    font-weight: 700;
}

.faq-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.faq-item {
    background: linear-gradient(135deg, rgba(112, 228, 219, 0.05) 0%, rgba(234, 88, 12, 0.05) 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(234, 88, 12, 0.15);
    border-left: 4px solid var(--accent-cyan);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.faq-item:hover {
    background: linear-gradient(135deg, rgba(112, 228, 219, 0.08) 0%, rgba(234, 88, 12, 0.08) 100%);
    border-color: rgba(234, 88, 12, 0.3);
    transform: translateY(-2px);
}

.faq-item h3 {
    color: var(--text-heading);
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item h3::after {
    content: '+';
    font-size: 1.2rem;
    color: var(--accent-purple);
    transition: transform var(--transition-fast);
}

.faq-item.active h3::after {
    content: '-';
    transform: rotate(180deg);
}

.faq-item p {
    color: var(--text-main);
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.7;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all var(--transition-normal);
}

.faq-item.active p {
    margin-top: var(--spacing-md);
    max-height: 500px;
    opacity: 1;
}

.svg-icon {
    display: inline-block;
    width: 1.2em;
    height: 1.2em;
    vertical-align: -0.25em;
    margin-right: 0.3em;
    fill: currentColor;
}

.svg-icon-lg {
    width: 2em;
    height: 2em;
    vertical-align: -0.4em;
    margin-right: 0.5em;
}

.svg-icon-xl {
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.step-details {
    flex: 1;
    padding-right: 20px;
}

.step-details h4 {
    color: var(--text-heading);
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.step-details p {
    color: var(--text-main);
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.7;
}

@media print {
    body {
        background: var(--bg-card) !important;
        padding: 0.5rem !important;
    }

    .tabs,
    .button-group,
    .disclaimer-box,
    .faq-section,
    .how-to-section,
    .warning-box,
    .patient-conditions,
    .dose-range-info,
    header,
    footer,
    noscript,
    .info-box,
    .unit-badge,
    .masterclass-section {
        display: none !important;
    }

    .tab-content {
        display: block !important;
        page-break-inside: avoid;
    }

    .calculator-grid {
        grid-template-columns: 1fr !important;
    }

    .input-section,
    .results-main {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }

    .result-value {
        color: #333 !important;
    }
}

/* Skip navigation link */
.skip-nav {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-purple);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    z-index: 1000;
    text-decoration: none;
    transition: top 0.2s ease;
}

.skip-nav:focus {
    top: var(--spacing-md);
}

/* Breadcrumb header */
.breadcrumb-header {
    max-width: 1000px;
    margin: 0 auto var(--spacing-lg);
    padding: 0 var(--spacing-xl);
}

.breadcrumb-nav {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.breadcrumb-link {
    color: var(--accent-purple);
    text-decoration: none;
    font-weight: 600;
}

.breadcrumb-link:hover {
    text-decoration: underline;
}

.breadcrumb-sep {
    margin: 0 0.5rem;
}

/* Site footer */
.site-footer {
    max-width: 1000px;
    margin: var(--spacing-2xl) auto 0;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid rgba(234, 88, 12, 0.15);
}

.site-footer p {
    margin: 0 0 var(--spacing-sm);
}

.site-footer p:last-child {
    margin-bottom: 0;
}

.footer-link {
    color: var(--accent-purple);
    text-decoration: none;
    font-weight: 600;
}

.footer-link:hover {
    text-decoration: underline;
}

/* Bottom disclaimer positioning */
.disclaimer-bottom {
    margin-top: var(--spacing-2xl);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

/* Masterclass Styles */
.masterclass-section {
    padding: 0 var(--spacing-xl);
}

.masterclass-section h2 {
    font-size: 1.8rem;
    color: var(--text-heading);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.conversion-card {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.conversion-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1) !important;
}

.practice-box {
    transition: all var(--transition-normal);
}

.practice-box:hover {
    border-color: rgba(234, 88, 12, 0.4);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.05) !important;
}

@media (max-width: 768px) {
    .masterclass-section {
        padding: 0 var(--spacing-md);
    }

    .masterclass-section h2 {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .masterclass-section {
        padding: 0 var(--spacing-sm);
    }

    .masterclass-section h2 {
        font-size: 1.2rem;
    }

    .practice-box {
        padding: 1rem !important;
    }
}

/* Custom Z-Score to P-Value Calculator Styles */
.calculator-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-premium);
    margin-bottom: var(--spacing-xl);
}

.graph-container {
    width: 100%;
    margin: var(--spacing-md) auto;
    text-align: center;
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 1px solid rgba(234, 88, 12, 0.15);
    box-shadow: var(--shadow-sm);
}

.graph-container svg {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.graph-curve {
    fill: none;
    stroke: #18181b;
    stroke-width: 3;
}

.graph-shaded {
    fill: rgba(234, 88, 12, 0.35);
    transition: all 0.3s ease;
}

.graph-axis {
    stroke: #71717a;
    stroke-width: 1.5;
}

.graph-grid {
    stroke: #e4e4e7;
    stroke-width: 1;
    stroke-dasharray: 4 4;
}

.graph-label {
    font-size: 11px;
    font-family: var(--font-family-base);
    fill: #27272a;
    font-weight: 600;
}

.graph-z-line {
    stroke: #EA580C;
    stroke-width: 2.5;
    stroke-dasharray: 3 3;
}

/* MathJax custom styles */
.math-block-wrapper {
    overflow-x: auto;
    max-width: 100%;
    padding: var(--spacing-sm) 0;
    margin: var(--spacing-md) 0;
}

.mjx-chtml {
    font-size: 110% !important;
}

.result-card-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid rgba(234, 88, 12, 0.1);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    grid-column: 1 / -1;
}

.result-verdict {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.95rem;
    text-align: center;
    margin-top: var(--spacing-md);
}

.verdict-reject {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.verdict-fail {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.step-formula-container {
    background: #fafafa;
    border: 1px solid #e4e4e7;
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    text-align: center;
}

.brand-steering-cta {
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    color: white;
    text-align: center;
    box-shadow: var(--shadow-premium-hover);
    margin: var(--spacing-3xl) 0;
}

.brand-steering-cta h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: white;
}

.brand-steering-cta p {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg) auto;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
}

.brand-steering-cta .btn {
    background: white;
    color: var(--primary);
    font-weight: 700;
    padding: 0.8rem 2.5rem;
    border-radius: 999px;
    text-decoration: none;
    display: inline-block;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.brand-steering-cta .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* Steps Table and Outlier Table styling for Pearson Correlation Coefficient Calculator */
.steps-table, .outlier-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
    font-size: 0.95rem;
}

.steps-table th, .outlier-table th {
    background: rgba(234, 88, 12, 0.08);
    color: var(--text-heading);
    font-weight: 700;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-subtle);
}

.steps-table td, .outlier-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-subtle);
    color: var(--text-main);
}

.steps-table tbody tr:nth-child(even), .outlier-table tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

.steps-table .sum-row {
    background: rgba(234, 88, 12, 0.04);
    border-top: 2px solid var(--primary);
    border-bottom: 2px solid var(--primary);
}

.text-center {
    text-align: center !important;
}

.fw-bold {
    font-weight: 700 !important;
}

.warning-tag {
    background: rgba(239, 68, 68, 0.08);
    color: #dc2626;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid rgba(239, 68, 68, 0.2);
    display: inline-block;
}

.alert-success-box, .alert-warning-box, .alert-neutral-box {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.alert-success-box {
    background: rgba(16, 185, 129, 0.08);
    color: #065f46;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-warning-box {
    background: rgba(245, 158, 11, 0.08);
    color: #92400e;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert-neutral-box {
    background: rgba(59, 130, 246, 0.08);
    color: #1e3a8a;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* Badge styling for correlation results */
.badge-strong-pos {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.85rem;
}

.badge-strong-neg {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.85rem;
}

.badge-mod {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.85rem;
}

/* Tab Panel Visibility */
.tab-panel {
    display: none;
}

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

/* Confidence Interval Display Component */
.ci-display {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.06) 100%);
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    margin: var(--spacing-md) 0;
}

.ci-label {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(99, 102, 241, 0.9);
    margin-bottom: var(--spacing-sm);
}

.ci-bounds {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.ci-lower,
.ci-upper {
    color: var(--accent-purple, #8b5cf6);
    font-family: var(--font-family-mono, monospace);
}

.ci-separator {
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 400;
}

.ci-notation {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-family: var(--font-family-mono, monospace);
}

/* Verdict Box */
.verdict-box {
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
    line-height: 1.7;
}

.verdict-box.success {
    background: rgba(16, 185, 129, 0.06);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.verdict-box h3 {
    color: #10b981;
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-sm) 0;
}

.verdict-box p {
    color: var(--text-main);
    font-size: 0.95rem;
    margin: 0 0 var(--spacing-sm) 0;
}

.verdict-box p:last-child {
    margin-bottom: 0;
}

@media (max-width: 480px) {
    .ci-bounds {
        font-size: 1.2rem;
        gap: var(--spacing-sm);
    }

    .ci-separator {
        font-size: 0.9rem;
    }
}

/* ==========================================================================
   Reviews Showcase & Student Testimonials Section (For Google Compliance)
   ========================================================================== */
.reviews-showcase-section {
    margin-top: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.reviews-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.reviews-header h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: var(--spacing-xs);
}

.reviews-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

.rating-badge-summary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(16, 185, 129, 0.08);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 50px;
    border: 1px solid rgba(16, 185, 129, 0.2);
    margin-top: var(--spacing-md);
}

.rating-value-badge {
    color: #10b981;
    font-weight: 800;
    font-size: 1.15rem;
}

.rating-stars-badge {
    color: #fbbf24;
    font-size: 1.15rem;
    letter-spacing: 2px;
}

.rating-count-badge {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.review-card {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.review-card:hover {
    transform: translateY(-2px);
    border-color: rgba(234, 88, 12, 0.2);
}

.review-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.review-card-author {
    font-weight: 700;
    color: var(--text-heading);
    font-size: 1.05rem;
}

.review-card-stars {
    color: #fbbf24;
    font-size: 0.95rem;
    letter-spacing: 1px;
}

.review-card-body {
    color: var(--text-main);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
    font-style: italic;
}

.review-card-footer {
    margin-top: var(--spacing-lg);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding-top: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.review-badge-verified {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: #10b981;
    font-weight: 600;
}

.review-badge-verified::before {
    content: '✓';
    font-weight: 800;
}

/* ==========================================================================
   Tools Hub Page Styles (tools/index.html)
   ========================================================================== */
.search-filter-wrapper {
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl) auto;
    position: relative;
}

.search-input-box {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl) var(--spacing-md) 45px;
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 50px;
    color: var(--text-main);
    font-size: 1.05rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-fast);
}

.search-input-box:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 8px 32px rgba(234, 88, 12, 0.1);
}

.search-icon-decor {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.hub-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.hub-tool-card {
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all var(--transition-normal);
}

.hub-tool-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 12px 40px rgba(234, 88, 12, 0.08);
}

.hub-tool-icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
}

.hub-tool-card h3 {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-heading);
    margin: 0 0 var(--spacing-sm) 0;
}

.hub-tool-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 var(--spacing-xl) 0;
    flex-grow: 1;
}

.hub-tool-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hub-tool-meta-badge {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-cyan);
    background: rgba(112, 228, 219, 0.1);
    padding: 4px 10px;
    border-radius: 4px;
}