* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

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

.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 .main-heading {
        grid-column: 1 / -1;
    }
}

@media (max-width: 991px) {
    .calculator-container {
        max-width: 600px;
    }
}

.main-heading {
    text-align: center;
    margin-bottom: 30px;
}

.main-heading h1 {
    color: #2c3e50;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
}

.main-heading p {
    color: #5a6c7d;
    font-size: 16px;
    max-width: 700px;
    margin: 0 auto;
}

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;
}

.input-group label {
    display: block;
    color: #5a6c7d;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 10px;
}

textarea, select, input[type="number"] {
    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;
}

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

textarea:hover, select:hover, input[type="number"]:hover {
    border-color: #cbd5e0;
}

textarea {
    resize: vertical;
    min-height: 150px;
}

select {
    cursor: pointer;
    -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;
}

.custom-cost-inputs {
    display: flex;
    gap: 16px;
    margin-top: -10px;
    margin-bottom: 10px;
}

.cost-warning {
    font-size: 12px;
    color: #7f8c8d;
    margin-top: -12px;
    margin-bottom: 24px;
}

.results {
    margin-top: 0;
    padding: 24px;
    background-color: #f8fafc;
    border-radius: 12px;
    height: fit-content;
    position: relative;
    border: 1px solid #e1e8ed;
}

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

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.result-item {
    background-color: white;
    padding: 16px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}

.result-label {
    color: #5a6c7d;
    font-size: 13px;
    margin-bottom: 6px;
    display: block;
}

.result-value {
    color: #2c3e50;
    font-size: 20px;
    font-weight: 600;
}

.results-summary {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 500px) {
    .results-summary {
        grid-template-columns: 1fr 1fr;
    }
}

.summary-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: #34495e;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e1e8ed;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    font-size: 14px;
}

.summary-label {
    color: #5a6c7d;
}

.summary-value {
    color: #2c3e50;
    font-weight: 600;
}

.total-summary {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 2px solid #e1e8ed;
}

.total-summary h4 {
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 12px;
}

.total-summary .summary-item .summary-value {
    font-size: 18px;
}

.estimation-notice {
    text-align: center;
    color: #5a6c7d;
    font-size: 12px;
    margin-top: 24px;
    font-style: italic;
    background-color: #eef4fb;
    padding: 10px;
    border-radius: 8px;
}

.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: 17px;
    line-height: 1.8;
    color: #2c3e50;
}

.blog-content h2:first-of-type {
    font-size: 32px;
    line-height: 1.3;
    margin-bottom: 24px;
    color: #2c3e50;
}

@media (max-width: 768px) {
    .blog-content h2:first-of-type {
        font-size: 28px;
    }
}

.blog-content p, .blog-content ul, .blog-content ol {
    margin-bottom: 20px;
}

.blog-content ul, .blog-content ol {
    padding-left: 20px;
}

.blog-content li {
    margin-bottom: 10px;
}

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

.formula-box {
    background-color: #f8fafc;
    border-left: 4px solid #4a90e2;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #2c3e50;
}

.faq-item {
    margin-bottom: 20px;
    padding-top: 20px;
    border-top: 1px solid #e1e8ed;
}

.faq-item:first-of-type {
    border-top: none;
    padding-top: 0;
}

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

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

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}

th, td {
    padding: 12px;
    text-align: left;
    border: 1px solid #e1e8ed;
}

thead tr {
    background-color: #f8fafc;
}

tbody tr:nth-child(even) {
    background-color: #fafbfc;
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 24px 16px;
    }
    .main-heading h1 {
        font-size: 24px;
    }
    .main-heading p {
        font-size: 15px;
    }
    .results {
        padding: 20px 16px;
        padding-top: 40px;
    }
    .copy-button {
        padding: 4px 8px;
        font-size: 12px;
        top: 8px;
        right: 8px;
        z-index: 10;
    }
    .copy-button svg {
        width: 14px;
        height: 14px;
    }
    .custom-cost-inputs {
        flex-direction: column;
        gap: 10px;
    }
    textarea, input[type="number"] {
        font-size: 16px !important;
    }
    .result-grid {
        grid-template-columns: 1fr;
    }
}

.toggle-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.toggle-label {
    color: #5a6c7d;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
}

.toggle-checkbox {
    cursor: pointer;
    width: 16px;
    height: 16px;
}

.copy-button {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: #f0f4f8;
    border: 1px solid #e1e8ed;
    color: #5a6c7d;
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
    z-index: 10;
}

.copy-button:hover {
    background-color: #e1e8ed;
    color: #2c3e50;
}

.token-usage-bar {
    width: 100%;
    background-color: #e1e8ed;
    border-radius: 8px;
    height: 24px;
    overflow: hidden;
    position: relative;
}

.token-usage-fill {
    height: 100%;
    background-color: #4a90e2;
    width: 0%;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 600;
    transition: width 0.5s ease, background-color 0.5s ease;
    overflow: hidden;
}

.token-usage-fill.warning { background-color: #f39c12; }
.token-usage-fill.danger { background-color: #e74c3c; }

.token-usage-text {
    white-space: nowrap;
}

.comparison-table {
    display: none;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #e1e8ed;
}

.comparison-table.show {
    display: block;
}

#comparisonTableContent {
    border: 1px solid #e1e8ed;
    border-radius: 8px;
    overflow: hidden;
}

#comparisonTableContent th, #comparisonTableContent td {
    border: none;
    border-bottom: 1px solid #e1e8ed;
}

#comparisonTableContent tr:last-child td {
    border-bottom: none;
}

#comparisonTableContent thead th {
    background-color: #4a90e2;
    color: white;
    font-weight: 600;
    text-align: center;
}

#comparisonTableContent tbody tr:nth-child(odd) {
    background-color: white;
}

#comparisonTableContent tbody tr:nth-child(even) {
    background-color: #f8fafc;
}

#comparisonTableContent td {
    text-align: right;
}

#comparisonTableContent td:first-child {
    text-align: left;
    font-weight: 500;
    color: #34495e;
}

#model-select option[value="custom"] {
    background-color: #fff3cd;
    color: #856404;
    font-weight: 600;
}

.result-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.08);
    position: relative;
    z-index: 1;
}

@media (max-width: 768px) {
    .calculator-container {
        gap: 24px;
    }
    .input-group {
        margin-bottom: 20px;
    }
    .main-heading h1 {
        font-size: 26px;
        line-height: 1.3;
    }
}

select {
    font-weight: 500;
}

select optgroup {
    font-weight: 600;
    color: #2c3e50;
}

#tokenUsageChart {
    max-height: 180px !important;
}

.copy-button:active {
    transform: translateY(1px);
}

.comparison-table table {
    font-size: 13px;
}

@media (max-width: 768px) {
    .comparison-table table {
        font-size: 12px;
    }
}