:root {
    --color-primary: #333333;
    --color-secondary: #666666;
    --color-accent: #142261;
    --color-background: #ffffff;
    --color-card-bg: #ffffff;
    --color-border: #eeeeee;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.35s ease;
    --transition-slow: 0.5s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-background);
    color: var(--color-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 1.5rem;
}

@media (min-width: 480px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.75rem;
    }
}

@media (min-width: 768px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .container {
        padding: 2.5rem 2rem;
    }
}

@media (min-width: 1024px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2.25rem;
    }
    
    .container {
        padding: 3rem 2.5rem;
    }
}

@media (min-width: 1280px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2.5rem;
    }
    
    .container {
        padding: 3.5rem 3rem;
    }
}

.card {
    background-color: var(--color-card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-image {
    position: relative;
    width: 100%;
    padding-top: 100%;
    overflow: hidden;
}

.card-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.card:hover .card-image img {
    transform: scale(1.08);
}

.card-content {
    padding: 1.25rem;
}

@media (min-width: 768px) {
    .card-content {
        padding: 1.5rem;
    }
}

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (min-width: 768px) {
    .card-title {
        font-size: 1rem;
        margin-bottom: 0.875rem;
    }
}

.card-description {
    font-size: 0.825rem;
    color: var(--color-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (min-width: 768px) {
    .card-description {
        font-size: 0.875rem;
        margin-bottom: 1.25rem;
    }
}

.card-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    color: var(--color-accent);
    font-size: 0.825rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.card-button:hover {
    gap: 0.75rem;
    color: #0056b3;
}

.card-button:focus {
    outline: none;
}

.card-button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 4px;
}

.button-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.card-button:hover .button-arrow {
    transform: translateX(4px);
}

@media (max-width: 479px) {
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 1.5rem 1rem;
    }
    
    .card-content {
        padding: 1rem;
    }
    
    .card-title {
        font-size: 0.9rem;
        margin-bottom: 0.625rem;
    }
    
    .card-description {
        font-size: 0.8rem;
        margin-bottom: 0.875rem;
    }
    
    .card-button {
        font-size: 0.8rem;
    }
}

@media (min-width: 1440px) {
    .card-title {
        font-size: 1.05rem;
    }
    
    .card-description {
        font-size: 0.9rem;
    }
}