:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #3b82f6;
    --accent-color: #f59e0b;
    --background-color: #f8fafc;
    --background-light: #ffffff;
    --background-alt: #f1f5f9;
    --text-color: #1e293b;
    --text-dark: #0f172a;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --hover-color: #3b82f6;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.05);
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Remove spinners from number inputs */
input[type="number"] {
    appearance: textfield;
    -moz-appearance: textfield;
}

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

/* Optimize number inputs for direct entry */
input[type="number"] {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    width: 100%;
    box-sizing: border-box;
}

input[type="number"]:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}

/* Enhance number input styling */
.input-group input[type="number"] {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Navigation */
.navbar {
    background-color: white;
    padding: 1.25rem 2rem;
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    transform: scaleX(1);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-links a:hover::after {
    transform: scaleX(1);
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    color: white;
    padding: 7rem 2rem 9rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%23ffffff" fill-opacity="0.05" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,213.3C1248,235,1344,213,1392,202.7L1440,192L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
    background-size: cover;
    background-position: center;
    opacity: 0.8;
}

.hero h1 {
    font-size: 2.75rem;
    color: white;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

/* Main Calculator Styles */
.main-calculator {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(59, 130, 246, 0.1);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.hero + .main-calculator {
    margin-top: -5rem;
    position: relative;
    z-index: 2;
}

/* Calculator Categories */
.calculator-categories {
    display: grid;
    gap: 2.5rem;
    padding: 2rem;
}

.calculator-category {
    background: white;
    border-radius: var(--radius-md);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.calculator-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.calculator-category h2 {
    color: var(--text-dark);
    margin-top: 0;
    margin-bottom: 1.75rem;
    font-size: 1.75rem;
    font-weight: 700;
    position: relative;
    padding-bottom: 0.75rem;
}

.calculator-category h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
}

.calc-card {
    background: var(--background-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.calc-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.calc-card h3 {
    margin: 0 0 0.75rem 0;
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
}

.calc-card p {
    margin: 0;
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Calculator Forms */
.calculator-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.input-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.result {
    margin-top: 20px;
    padding: 10px;
    background-color: #e9ecef;
    border-radius: 4px;
    font-weight: bold;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 10px;
    }
}

/* Probability Calculator Specific Styles */
#probability-result, #combination-result, #permutation-result {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
    padding: 10px;
    border-radius: 4px;
    margin-top: 10px;
}

.invalid-result {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.calculator-form {
    display: grid;
    gap: 1.75rem;
    margin-top: 2rem;
}

.form-group {
    display: grid;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-dark);
    font-size: 0.95rem;
}

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

.currency-symbol {
    position: absolute;
    left: 1rem;
    color: var(--text-light);
}

input[type="number"],
select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    color: var(--text-color);
    transition: var(--transition);
    background-color: var(--background-light);
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input[type="number"].currency {
    padding-left: 2.25rem;
}

.term-input {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

button:active {
    transform: translateY(0);
}

/* Enhanced Number Input Styles */
.number-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    flex: 1;
}

.enhanced-number-input {
    width: 100%;
    padding: 8px 35px 8px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.2s;
}

.enhanced-number-input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.number-controls {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    border-left: 1px solid #ddd;
}

.number-control {
    padding: 0;
    width: 24px;
    height: 50%;
    border: none;
    background: #f8f9fa;
    color: #495057;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    user-select: none;
}

.number-control:hover {
    background: #e9ecef;
}

.number-control:active {
    background: #dee2e6;
}

/* Result styles */
.result-input {
    background-color: #f8f9fa;
    cursor: default;
}

.copy-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    border: none;
    background: none;
    padding: 4px;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.copy-btn:hover {
    opacity: 1;
}

.copy-btn.copied {
    color: #28a745;
}

/* Controls Group */
.controls-group {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 0 12px;
}

.swap-btn, .clear-btn {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.swap-btn:hover, .clear-btn:hover {
    background: #f8f9fa;
    border-color: #ccc;
}

/* Quick Conversion Tabs */
.quick-conversions {
    margin-top: 24px;
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow: hidden;
}

.quick-conversion-tabs {
    display: flex;
    border-bottom: 1px solid #ddd;
    background: #f8f9fa;
}

.quick-tab {
    padding: 12px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-weight: 500;
    color: #495057;
    transition: all 0.2s;
}

.quick-tab:hover {
    background: #e9ecef;
}

.quick-tab.active {
    background: white;
    color: #007bff;
    box-shadow: inset 0 -2px 0 #007bff;
}

.quick-conversion-content {
    padding: 16px;
}

.quick-panel {
    display: none;
}

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

.conversion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 12px;
}

.conversion-item {
    padding: 12px;
    background: #f8f9fa;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
}

.conversion-item span {
    font-size: 15px;
    margin-bottom: 4px;
}

.conversion-item small {
    color: #6c757d;
    font-size: 13px;
}

/* Formula Display */
.formula {
    padding: 12px;
    background: #f8f9fa;
    border-radius: 4px;
    font-family: monospace;
    color: #495057;
}

/* Results Styling */
.result-container {
    margin-top: 2.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border-color);
}

.loan-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.result-item {
    text-align: center;
    background-color: var(--background-alt);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.result-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.result-item h3 {
    margin: 0;
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 500;
}

.result-item span {
    display: block;
    margin-top: 0.75rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
}

.highlight {
    color: var(--primary-color) !important;
}

/* Amortization Table */
.amortization-section {
    margin-top: 2.5rem;
}

.table-container {
    overflow-x: auto;
    margin-top: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    background-color: white;
}

th, td {
    padding: 1rem;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--background-alt);
    font-weight: 600;
    color: var(--text-dark);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

tr:hover {
    background-color: rgba(59, 130, 246, 0.05);
}

tr.alternate-row {
    background-color: var(--background-alt);
}
/* Scientific Calculator Styles */
.scientific-calculator {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    max-width: 500px;
    margin: 0 auto;
    font-family: 'Inter', sans-serif;
}

.calc-display {
    background: #ffffff;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    text-align: right;
    border: 1px solid #e0e0e0;
}

.calc-display .expression {
    font-size: 0.9rem;
    color: #7f8c8d;
    min-height: 1.2em;
    margin-bottom: 0.5rem;
    word-wrap: break-word;
}

.calc-display .result {
    font-size: 2rem;
    font-weight: 600;
    color: #2c3e50;
}

.mode-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.mode-toggle button {
    flex: 1;
    background: #e9ecef;
    color: #495057;
    border: 1px solid #dee2e6;
    padding: 0.5rem;
    font-size: 0.9rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-toggle button.active {
    background: #4a6bff;
    color: white;
    border-color: #3a56d4;
}

.calc-buttons {
    display: grid;
    gap: 0.5rem;
}

.button-row {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.5rem;
}

.calc-buttons button {
    width: 100%;
    aspect-ratio: 1.5;
    font-size: 1.1rem;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    background: #ffffff;
    color: #2c3e50;
    transition: all 0.2s;
    cursor: pointer;
}

.calc-buttons button:hover {
    background: #e9ecef;
    transform: translateY(-1px);
}

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

/* Operator Container Styles */
.operator-container {
    display: flex;
    flex-direction: column;
    grid-column: span 1;
    gap: 0.5rem;
}

.operator-container button {
    flex: 1;
    aspect-ratio: auto;
    height: 100%;
}

.calc-buttons .number {
    background: white;
}

.calc-buttons .operator {
    background: #e9ecef;
    color: #4a6bff;
    font-weight: 600;
}

.calc-buttons .function {
    background: #e9ecef;
    font-size: 0.9rem;
}

.calc-buttons .equals {
    background: #4a6bff;
    color: white;
    font-weight: 600;
}

.calc-buttons .clear {
    background: #dc3545;
    color: white;
}

.calc-buttons .delete {
    background: #6c757d;
    color: white;
}

.history-panel {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #dee2e6;
}

.history-panel h3 {
    font-size: 1rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.history-item {
    padding: 0.5rem;
    border-bottom: 1px solid #dee2e6;
}

.history-expression {
    font-size: 0.9rem;
    color: #7f8c8d;
}

.history-result {
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 500;
}

#clearHistory {
    width: 100%;
    margin-top: 1rem;
    padding: 0.5rem;
    background: #e9ecef;
    color: #495057;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

#clearHistory:hover {
    background: #dee2e6;
}

@media (max-width: 500px) {
    .button-row {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .calc-buttons button {
        font-size: 1rem;
    }
    
    .operator-container {
        grid-column: span 4;
        flex-direction: row;
    }
}

/* Operator-specific styles */
.calc-buttons .operator[data-action="add"],
.calc-buttons .operator[data-action="subtract"],
.calc-buttons .operator[data-action="multiply"],
.calc-buttons .operator[data-action="divide"] {
    background: #4a6bff;
    color: white;
    font-size: 1.2rem;
    border: none;
}

.calc-buttons .operator[data-action="add"]:hover,
.calc-buttons .operator[data-action="subtract"]:hover,
.calc-buttons .operator[data-action="multiply"]:hover,
.calc-buttons .operator[data-action="divide"]:hover {
    background: #3a56d4;
}
/* Footer */
footer {
    background-color: white;
    padding: 3rem 0 2rem;
    margin-top: 5rem;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.05);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    color: var(--text-dark);
    margin-bottom: 1.25rem;
    font-size: 1.1rem;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
}

.footer-section a:hover {
    color: var(--primary-color);
    transform: translateX(3px);
}

.footer-bottom {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 1.5rem;
    }
    
    .hero {
        padding: 5rem 1rem 7rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .calculator-container {
        padding: 1.5rem;
    }
    
    .calculator-category {
        padding: 1.5rem;
    }
    
    .loan-summary {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* Content Container */
.content-container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 2.5rem;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.content-container h1 {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    font-size: 2.25rem;
    font-weight: 700;
}

/* About & Policy Pages */
.about-section, .policy-section {
    margin-bottom: 2.5rem;
}

.about-section h2, .policy-section h2 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.5rem;
}

.about-section h2::after, .policy-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
}

.about-section p, .policy-section p {
    color: var(--text-color);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.last-updated {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 2rem;
    font-style: italic;
}

/* Ad Container */
.ad-container {
    margin: 3rem auto;
    text-align: center;
    max-width: 900px;
    padding: 1.5rem;
    background-color: var(--background-alt);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* Fraction Calculator Styles */
.fraction-input {
    margin-bottom: 2rem;
}

.fraction-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    max-width: 120px;
    margin: 0 auto;
}

.fraction-line {
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    margin: 0.25rem 0;
}

.operation-select {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.operation-btn {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    border-radius: 50%;
    background: var(--background-alt);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.operation-btn:hover {
    transform: translateY(-3px);
    background: var(--background-light);
    border-color: var(--primary-color);
}

.operation-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
}

.result-fraction {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.fraction-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.fraction-display .numerator,
.fraction-display .denominator {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.decimal-result {
    font-size: 1.25rem;
    color: var(--text-light);
}

.mixed-number {
    text-align: center;
    margin-top: 2rem;
    padding: 1rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
}

.mixed-number h4 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.mixed-number p {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .operation-select {
        gap: 0.5rem;
    }

    .operation-btn {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
}

/* Equation Solver Styles */
.form-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.equation-text {
    font-size: 1.25rem;
    color: var(--text-dark);
    font-weight: 500;
}

.equation-preview {
    text-align: center;
    margin: 1.5rem 0;
    font-size: 1.5rem;
    color: var(--primary-color);
    min-height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-display {
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
}

.steps-container {
    margin: 2rem 0;
}

.step {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

.step:last-child {
    border-bottom: none;
}

#graph {
    width: 100%;
    height: 400px;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .equation-text {
        text-align: center;
    }

    #graph {
        height: 300px;
    }
}

/* Area Calculator Styles */
.shape-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--background-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.shape-btn:hover {
    transform: translateY(-2px);
    background: var(--background-light);
    border-color: var(--primary-color);
}

.shape-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
}

.shape-icon {
    width: 32px;
    height: 32px;
}

.shape-form {
    display: none;
    animation: fadeIn 0.3s ease;
}

.shape-form.active {
    display: block;
}

.shape-diagram {
    width: 200px;
    height: 200px;
    margin: 0 auto 2rem;
}

.shape-diagram svg {
    width: 100%;
    height: 100%;
}

.diagram-label {
    font-size: 14px;
    font-family: 'Times New Roman', serif;
    font-style: italic;
}

.area-result {
    text-align: center;
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.result-value #areaUnit {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-left: 0.5rem;
}

.formula-container {
    text-align: center;
    margin: 2rem 0;
}

.formula {
    font-size: 1.25rem;
    padding: 1rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 4rem;
}

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

@media (max-width: 768px) {
    .shape-selector {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .shape-diagram {
        width: 160px;
        height: 160px;
    }
}

/* Volume Calculator Styles */
.shape-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--background-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.shape-btn:hover {
    transform: translateY(-2px);
    background: var(--background-light);
    border-color: var(--primary-color);
}

.shape-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
}

.shape-icon {
    width: 32px;
    height: 32px;
}

.shape-form {
    display: none;
    animation: fadeIn 0.3s ease;
}

.shape-form.active {
    display: block;
}

.shape-diagram {
    width: 200px;
    height: 200px;
    margin: 0 auto 2rem;
    padding: 1rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
}

.shape-diagram svg {
    width: 100%;
    height: 100%;
}

.diagram-label {
    font-size: 14px;
    font-family: 'Times New Roman', serif;
    font-style: italic;
}

.result-container {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
}

.volume-result {
    text-align: center;
    margin: 1rem 0;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

#volumeUnit {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-left: 0.5rem;
}

.formula-container {
    text-align: center;
    margin: 1.5rem 0;
}

.formula {
    padding: 1rem;
    background: var(--background-light);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 4rem;
    overflow-x: auto;
}

.steps-container {
    margin-top: 1.5rem;
}

.step {
    padding: 0.75rem;
    background: var(--background-light);
    border-radius: var(--radius-sm);
    margin: 0.5rem 0;
}

.swap-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    margin: 1rem auto;
    background: var(--background-alt);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-color);
    transition: var(--transition);
}

.swap-btn:hover {
    background: var(--background-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .shape-selector {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .shape-diagram {
        width: 160px;
        height: 160px;
    }
}

/* Unit Converter Styles */
.unit-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.unit-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    font-size: 0.9rem;
    color: #555;
    transition: all 0.2s ease;
}

.unit-tab:hover {
    background: #f5f5f5;
}

.unit-tab.active {
    background: #0a74da;
    color: white;
    border-color: #0a74da;
}

.unit-tab.active .unit-icon {
    color: white;
}

.unit-icon {
    width: 20px;
    height: 20px;
    color: #666;
}

.converter-container {
    background: white;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.conversion-group {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.input-group {
    flex: 1;
    display: flex;
    gap: 8px;
}

.input-group input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
}

.input-group input:focus {
    outline: none;
    border-color: #0a74da;
}

.unit-select {
    min-width: 120px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    font-size: 0.9rem;
}

.swap-btn {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.swap-btn:hover {
    background: #f5f5f5;
}

.formula-display {
    margin-bottom: 24px;
}

.formula {
    padding: 12px;
    background: #f5f7f9;
    border-radius: 6px;
    font-family: monospace;
    color: #333;
}

.conversion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.conversion-item {
    padding: 12px;
    background: #f5f7f9;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.conversion-item span {
    font-weight: 500;
}

.conversion-item small {
    color: #666;
    font-size: 0.85rem;
}

/* Age Calculator Specific Styles */
.calculator-description {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.info-banner {
    display: flex;
    align-items: center;
    gap: 2rem;
    background: var(--background-alt);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.calculator-icon {
    width: 100px;
    height: 100px;
    object-fit: contain;
}

.info-text {
    flex: 1;
}

.info-text h2 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.info-text ul {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
}

.info-text ul li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.info-text ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.date-inputs {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.date-select {
    display: grid;
    grid-template-columns: 1fr 1.5fr 1fr;
    gap: 0.5rem;
}

.date-fallback {
    display: none;
}

@supports not (grid-template-columns: 1fr 1.5fr 1fr) {
    .date-select {
        display: none;
    }
    .date-fallback {
        display: block;
    }
}

.option-group {
    text-align: center;
    margin-bottom: 1rem;
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.toggle-label input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.result-item {
    text-align: center;
    background: var(--background-alt);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.result-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.result-item span {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.result-item label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.additional-info {
    margin-top: 3rem;
}

.info-section {
    background: white;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.info-section h4 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.info-item label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.info-item span {
    font-weight: 500;
    color: var(--text-dark);
}

.zodiac-icon {
    width: 24px;
    height: 24px;
    vertical-align: middle;
    margin-left: 0.5rem;
}

.fun-facts {
    background: var(--background-alt);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.fun-facts h4 {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.fun-facts ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.fun-facts li {
    padding: 0.75rem;
    background: white;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.fun-facts li:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-sm);
}

.secondary-button {
    background: var(--background-alt);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.secondary-button:hover {
    background: var(--background-light);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .info-banner {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .calculator-icon {
        width: 80px;
        height: 80px;
    }

    .date-inputs {
        gap: 1rem;
    }

    .result-grid {
        grid-template-columns: 1fr;
    }
}