/* Base Styles */
:root {
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 {
    font-size: 2.25rem;
}

h2 {
    font-size: 1.875rem;
}

h3 {
    font-size: 1.5rem;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-top: 0.5rem;
}

/* Layout */
.header {
    padding: 2rem 0;
    background-color: #fff;
    box-shadow: var(--shadow-sm);
}

.main {
    padding: 2rem 0;
}

.footer {
    padding: 2rem 0;
    background-color: var(--gray-100);
    border-top: 1px solid var(--gray-200);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--gray-600);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--gray-900);
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    gap: 2.5rem;
}

.category {
    display: grid;
    gap: 1rem;
}

.category h2 {
    font-size: 1.5rem;
    color: var(--gray-700);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.tools {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Tool Cards */
.tool-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--gray-200);
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.tool-card h3 {
    font-size: 1.25rem;
    color: var(--primary);
}

.tool-card p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

.icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

.icon svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.icon.finance {
    background-color: #e0e7ff;
    color: var(--primary);
}

.icon.health {
    background-color: #d1fae5;
    color: var(--secondary);
}

.icon.other {
    background-color: #fef3c7;
    color: var(--warning);
}

/* Calculator Page */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.breadcrumb a {
    color: var(--gray-600);
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb a:hover {
    color: var(--primary);
}

.breadcrumb span:last-child {
    color: var(--gray-700);
    font-weight: 500;
}

.calculator-page h1 {
    margin-bottom: 1rem;
}

.calculator-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.related-calculators {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

.related-tools {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.related-card {
    display: block;
    padding: 1.25rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--gray-200);
}

.related-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--primary-light);
}

.related-card h3 {
    font-size: 1.125rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.related-card p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    h1 {
        font-size: 1.875rem;
    }
    
    .tools {
        grid-template-columns: 1fr;
    }
    
    .tool-card {
        padding: 1.25rem;
    }
}

/* Print Styles */
@media print {
    .header, .footer, .related-calculators {
        display: none;
    }
    
    .calculator-container {
        box-shadow: none;
        border: none;
        padding: 0;
    }
}