/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #059669;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --background: #ffffff;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Privacy Banner */
.privacy-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    z-index: 1000;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    box-shadow: 0 -4px 12px var(--shadow);
}

.privacy-banner.show {
    transform: translateY(0);
}

.privacy-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    gap: var(--spacing-sm);
}

.privacy-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.btn-accept {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s ease;
}

.btn-accept:hover {
    background: #1d4ed8;
}

.privacy-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-lg);
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: #f1f5f9;
}

/* Hero Section */
.hero {
    margin-bottom: var(--spacing-xl);
    background: #f8fafc;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px var(--shadow);
}

.btn-primary:hover {
    background: #1d4ed8;
    box-shadow: 0 4px 8px var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow);
}

.btn-secondary:hover {
    background: #f8fafc;
    box-shadow: 0 4px 8px var(--shadow-lg);
    transform: translateY(-1px);
}

/* Section Titles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

/* Popular Calculators Grid */
.popular-calculators {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
}

.calculators-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.calculator-card {
    padding: var(--spacing-lg);
    text-align: center;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    box-shadow: 0 2px 4px var(--shadow);
}

.calculator-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.calculator-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.calculator-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
    font-size: 0.875rem;
}

.card-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.card-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Features Section */
.features {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
    background: #f8fafc;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.feature-block {
    padding: var(--spacing-lg);
    text-align: center;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow);
}

.feature-block:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.feature-block h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.feature-block p {
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 0.875rem;
}

/* Footer */
.footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: #f8fafc;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

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

.footer-links a:hover {
    color: #1d4ed8;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .privacy-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-content {
        padding: var(--spacing-lg);
    }
}