* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f5f7fa;
    min-height: 100vh;
    padding: 20px;
    padding-top: 92px !important; 
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

@media (max-width: 768px) {
    body {
        padding-top: 84px !important;
    }
}

@media (max-width: 480px) {
    body {
        padding-top: 80px !important;
    }
}

.main-container {
    flex: 1 0 auto; 
    width: 100%;    
    background-color: #f8f9fa;
    padding: 40px 20px;
}

.calculator-container {
    background-color: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 1200px;
    margin: 20px auto 60px;
}

@media (min-width: 992px) {
    .calculator-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 40px;
        padding: 40px 50px;
    }
    
    .calculator-container h1 {
        grid-column: 1 / -1;
    }
    
    .calculator-inputs {
        display: flex;
        flex-direction: column;
    }
    
    .calculator-results {
        display: flex;
        flex-direction: column;
    }
}

/* Keep mobile/tablet layout centered */
@media (max-width: 991px) {
    .calculator-container {
        max-width: 520px;
    }
}

h1 {
    color: #2c3e50;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 30px;
    text-align: center;
}

h2 {
    color: #2c3e50;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    margin-top: 30px;
}

h3 {
    color: #34495e;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    margin-top: 25px;
}

.input-group {
    margin-bottom: 24px;
}

label {
    display: block;
    color: #5a6c7d;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

input[type="number"], input[type="text"] {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: #fafbfc;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

input[type="number"]:focus, input[type="text"]:focus {
    outline: none;
    border-color: #4a90e2;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.toggle-group {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.toggle-option {
    flex: 1;
    position: relative;
}

.toggle-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.toggle-option label {
    display: block;
    padding: 12px;
    text-align: center;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 0;
    background-color: #fafbfc;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.toggle-option input[type="radio"]:checked + label {
    background-color: #4a90e2;
    color: white;
    border-color: #4a90e2;
}

.toggle-option input[type="radio"]:focus + label {
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.time-period-group {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.time-input {
    flex: 1;
}

.time-toggle {
    flex: 0.5;
    min-width: 120px;
}

#timeUnit {
    font-size: 15px;
}

select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    font-size: 16px;
    font-family: inherit;
    background-color: #fafbfc;
    cursor: pointer;
    transition: all 0.3s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235a6c7d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 40px;
}

select:focus {
    outline: none;
    border-color: #4a90e2;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.compound-only {
    transition: all 0.3s ease;
}

.compound-only.show {
    display: block !important;
    animation: fadeIn 0.3s ease;
}

.results {
    margin-top: 0;
    padding: 24px;
    background-color: #f8fafc;
    border-radius: 12px;
    height: fit-content;
    border: 1px solid #e1e8ed;
    transition: box-shadow 0.3s ease;
}

@media (max-width: 991px) {
    .results {
        margin-top: 32px;
    }
}

.results.calculated {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e1e8ed;
}

.result-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.result-label {
    color: #5a6c7d;
    font-size: 14px;
}

.result-value {
    color: #4a944a;
    font-size: 18px;
    font-weight: 600;
}
.result-value.princi {
    color: #498fe0;
    font-size: 18px;
}
.result-value.total {
    color: #2c3e50;
    font-size: 19px;
}

.chart-container {
    margin-top: 24px;
    background-color: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.chart-title {
    font-size: 14px;
    color: #5a6c7d;
    text-align: center;
    margin-bottom: 16px;
    font-weight: 500;
}

.chart-wrapper {
    max-width: 280px;
    margin: 0 auto;
    position: relative;
}

.line-chart-wrapper {
    margin-top: 20px;
    height: 250px;
    position: relative;
}

.chart-placeholder {
    display: none;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    color: #5a6c7d;
    font-size: 14px;
    padding: 20px;
    border: 2px dashed #e1e8ed;
    border-radius: 8px;
    background-color: #fafbfc;
}

.placeholder-active canvas {
    display: none;
}

.placeholder-active .chart-placeholder {
    display: flex;
}

.placeholder-active .tap-hint {
    display: none;
}

@media (min-width: 992px) {
    .chart-wrapper {
        max-width: 350px;
    }
    
    .line-chart-wrapper {
        height: 300px;
    }
}

.realtime-notice {
    text-align: center;
    color: #5a6c7d;
    font-size: 12px;
    margin-top: 16px;
    font-style: italic;
}

.tap-hint {
    text-align: center;
    color: #5a6c7d;
    font-size: 11px;
    margin-top: 8px;
    font-style: italic;
    opacity: 0.8;
}

.calculator-actions {
    display: flex;
    gap: 12px;
    margin-top: 10px;
    margin-bottom: 24px;
}

.calculator-actions button {
    flex: 1;
    padding: 12px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    -webkit-tap-highlight-color: transparent;
}

.btn-secondary {
    background-color: #e1e8ed;
    color: #5a6c7d;
    border-color: #e1e8ed;
}

.btn-secondary:hover {
    background-color: #d3dce3;
    border-color: #d3dce3;
}

.btn-tertiary {
    background-color: transparent;
    color: #5a6c7d;
    border-color: #e1e8ed;
}

.btn-tertiary:hover {
    background-color: #f8fafc;
    border-color: #d3dce3;
}

.interactive-formula {
    display: none;
    margin: 20px 0;
    padding: 20px;
    background-color: #f8fafc;
    border-radius: 12px;
    border: 2px solid #e1e8ed;
    animation: fadeIn 0.3s ease;
}

.interactive-formula.show {
    display: block;
}

.interactive-formula h3 {
    font-size: 20px !important;
    margin-bottom: 20px !important;
    text-align: center;
}

.formula-controls {
    margin-bottom: 20px;
}

.formula-controls .toggle-group {
    margin-bottom: 0;
}

.formula-input-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 18px;
    margin: 15px 0;
    flex-wrap: wrap;
}

.formula-value {
    padding: 8px 12px;
    background-color: #4a90e2;
    color: white;
    border-radius: 6px;
    font-weight: 600;
}

.formula-operator {
    font-size: 20px;
    color: #5a6c7d;
}

.formula-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
    padding: 20px;
    background-color: #f0f4f8;
    border-radius: 8px;
}

.formula-part {
    text-align: center;
    padding: 10px;
    background-color: white;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.formula-part strong {
    display: block;
    color: #4a90e2;
    margin-bottom: 5px;
}

.blog-section {
    background-color: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    max-width: 1200px;
    margin: 0 auto;
}

@media (min-width: 992px) {
    .blog-section {
        padding: 50px 60px;
    }
    
    .blog-content {
        max-width: 800px;
        margin: 0 auto;
    }
}

.blog-content {
    color: #34495e;
    font-size: 16px;
    line-height: 1.8;
}

.blog-content p {
    margin-bottom: 20px;
    text-align: justify;
}

.blog-content ul, .blog-content ol {
    margin-bottom: 20px;
    padding-left: 0;
    list-style: none;
}

.blog-content li {
    margin-bottom: 15px;
    padding-left: 30px;
    position: relative;
    line-height: 1.6;
}

.blog-content ul li:before {
    content: "•";
    position: absolute;
    left: 10px;
    font-weight: bold;
    color: #2c3e50;
}

.blog-content ol {
    counter-reset: item;
}

.blog-content ol li:before {
    content: counter(item) ".";
    counter-increment: item;
    position: absolute;
    left: 10px;
    font-weight: bold;
    color: #2c3e50;
}

.blog-content li strong {
    font-weight: 600;
    color: #2c3e50;
}

.formula-box {
    background-color: #f8fafc;
    border-left: 4px solid #4a90e2;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
}

.formula-box code {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #2c3e50;
}

.formula-visual {
    margin: 15px 0;
    text-align: center;
    background-color: white;
    padding: 15px;
    border-radius: 8px;
}

.formula-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.formula-text {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e1e8ed;
}

.example-box {
    background-color: #e8f5e9;
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.example-box h4 {
    color: #2e7d32;
    margin-bottom: 10px;
}

.faq-item {
    margin-bottom: 20px;
    padding: 20px;
    background-color: #f8fafc;
    border-radius: 12px;
}

.faq-question {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 10px;
}

.faq-answer {
    color: #5a6c7d;
    line-height: 1.6;
}

.calculating {
    opacity: 0.6;
    pointer-events: none;
}

.error-message {
    color: #e74c3c;
    font-size: 12px;
    margin-top: 4px;
    display: none;
}

.input-error {
    border-color: #e74c3c !important;
}

@media (max-width: 768px) {
    .main-container {
        padding: 0;
    }

    .blog-section {
        padding: 30px 20px;
        border-radius: 20px 20px 0 0;
        margin-top: 40px;
    }

    .blog-content {
        font-size: 15px;
    }

    h2 {
        font-size: 22px;
    }

    h3 {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 24px 16px;
    }

    h1 {
        font-size: 24px;
        margin-bottom: 24px;
    }

    .input-group {
        margin-bottom: 20px;
    }

    input[type="number"], input[type="text"], select {
        padding: 12px 16px;
        font-size: 16px;
        -webkit-text-size-adjust: 100%;
    }

    .time-period-group {
        gap: 6px;
    }

    .time-toggle {
        flex: 0.6;
        min-width: 100px;
    }

    .toggle-option label {
        padding: 10px 8px;
        font-size: 14px;
    }

    .results {
        padding: 16px;
    }

    .result-value {
        font-size: 16px;
    }

    .result-value.total {
        font-size: 20px;
    }

    .chart-container {
        padding: 16px;
    }

    .line-chart-wrapper {
        height: 200px;
    }

    .blog-content p {
        text-align: left;
    }

    .formula-visual {
        padding: 10px;
    }
    
    .formula-breakdown {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .formula-input-display {
        font-size: 16px;
    }

    @media (hover: none) and (pointer: coarse) {
        .toggle-option label:active {
            background-color: #e1e8ed;
        }
        
        .toggle-option input[type="radio"]:checked + label:active {
            background-color: #357abd;
        }
    }
}

@supports (-webkit-touch-callout: none) {
    input[type="number"],
    input[type="text"],
    select {
        font-size: 16px !important;
    }
}

@media print {
    body {
        background-color: white;
    }
    
    .calculator-container {
        box-shadow: none;
        padding: 20px;
    }
    
    .tap-hint,
    .realtime-notice {
        display: none;
    }
}

.btn-secondary.btn-danger {
    background-color: transparent;
    color: #6c757d;
    border: 2px solid #dee2e6;
}

.btn-secondary.btn-danger:hover {
    background-color: #f8f9fa;
    border-color: #ced4da;
    color: #495057;
}