/* ================================================
   SOFA - Modern Stylesheet
   A clean, responsive design for the Sofa website
   ================================================ */

/* CSS Custom Properties for easy theming and maintenance */
:root {
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #e0e0e0;
    --color-background: #ffffff;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    --font-size-base: 16px;
    --font-size-large: 1.125rem;
    --font-size-hero: clamp(3rem, 8vw, 5rem);
    
    --transition-smooth: all 0.3s ease;
}

/* Base styles and resets */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-weight: 500;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    line-height: 1.6;
    font-size: var(--font-size-base);
}

/* Smooth scroll behavior for better UX */
html {
    scroll-behavior: smooth;
}

/* ================================================
   HEADER SECTION
   ================================================ */

header {
    text-align: center;
    padding: var(--spacing-md) var(--spacing-sm);
}

/* Logo styling with responsive sizing */
.logo {
    max-width: 100%;
    height: auto;
    width: clamp(200px, 40vw, 400px);
}

/* ================================================
   MAIN CONTENT
   ================================================ */

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

/* ================================================
   HERO SECTION
   ================================================ */

.hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* Main heading with responsive sizing */
h1 {
    font-size: var(--font-size-hero);
    font-weight: bold;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

/* Tagline container for the company description */
.tagline {
    margin: var(--spacing-lg) auto;
    max-width: 800px;
}

h2 {
    font-size: var(--font-size-large);
    font-weight: 400;
    line-height: 1.8;
    color: var(--color-text-secondary);
    padding: var(--spacing-md) var(--spacing-sm);
}

/* Horizontal dividers for visual separation */
hr {
    width: 100%;
    max-width: 95%;
    margin: 0 auto;
    border: none;
    border-top: 1px solid var(--color-border);
}

/* ================================================
   NAVIGATION / SERVICE CARDS
   ================================================ */

nav {
    margin: var(--spacing-xl) 0;
}

/* Grid layout for service cards with responsive columns */
.service-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
}

/* Individual service card styling */
.service-card {
    padding: var(--spacing-md);
    transition: var(--transition-smooth);
    border-radius: 8px;
}

/* Subtle hover effect for interactivity */
.service-card:hover {
    background-color: #fafafa;
    transform: translateY(-2px);
}

.service-card h3 {
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.service-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-top: var(--spacing-sm);
}

/* Arrow icon for visual interest */
.arrow-icon {
    width: 10px;
    height: 10px;
    opacity: 0.5;
    transition: var(--transition-smooth);
}

.service-card:hover .arrow-icon {
    opacity: 1;
    transform: translateX(4px);
}

/* ================================================
   FOOTER SECTION
   ================================================ */

footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-sm);
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

/* Announcement banner styling */
.announcement {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.app-icon {
    width: 20px;
    height: 20px;
}

.announcement-label {
    font-weight: bold;
    color: var(--color-text-primary);
}

.announcement-text {
    color: var(--color-text-muted);
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */

/* Tablet and below */
@media (max-width: 768px) {
    .service-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--spacing-md);
    }
    
    h1 {
        font-size: clamp(2.5rem, 10vw, 4rem);
    }
    
    h2 {
        font-size: 1rem;
    }
}

/* Mobile devices */
@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .announcement {
        font-size: 0.9rem;
    }
}

/* Large screens for optimal reading width */
@media (min-width: 1400px) {
    main {
        max-width: 1400px;
    }
}