/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --section-bg: #f9fafb;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

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

/* Container with responsive max-width */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Header */
.header {
    background-color: var(--bg-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-sm);
    min-height: 70px;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.lang-switcher {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    cursor: pointer;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 0.875rem;
    min-width: 45px;
}

.lang-btn:hover {
    background: var(--primary-color);
    color: white;
}

.lang-btn.active {
    background: var(--primary-color);
    color: white;
}

/* Hero section */
.hero {
    padding: var(--spacing-xl) var(--spacing-sm);
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    line-height: 1.2;
}

.hero-text {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

.cta-button {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    background: white;
    color: var(--primary-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.cta-button:active {
    transform: translateY(0);
}

/* Features section */
.features {
    padding: var(--spacing-xl) var(--spacing-sm);
    background-color: var(--section-bg);
}

.section-title {
    text-align: center;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.feature-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    font-weight: 600;
}

.feature-card p {
    color: #6b7280;
    line-height: 1.8;
}

/* About section */
.about {
    padding: var(--spacing-xl) var(--spacing-sm);
    background-color: var(--bg-color);
}

.about-text {
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.8;
    color: #4b5563;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

/* Footer */
.footer {
    background-color: var(--text-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-sm);
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
}

/* Responsive breakpoints */
/* Mobile first approach */

/* Small devices (phones, 576px and up) */
@media (min-width: 576px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .lang-btn {
        font-size: 0.9rem;
        padding: 0.5rem 1.25rem;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .features {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .about {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .nav {
        flex-wrap: nowrap;
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Ultra wide screens (1400px and up) */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
    
    .features-grid {
        gap: var(--spacing-lg);
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
}

/* Mobile specific adjustments */
@media (max-width: 575px) {
    .nav {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .lang-switcher {
        width: 100%;
        justify-content: center;
    }
    
    .lang-btn {
        flex: 1;
        max-width: 70px;
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .hero {
        padding: var(--spacing-lg) var(--spacing-sm);
        min-height: 50vh;
    }
    
    .features {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .about {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .feature-card {
        padding: var(--spacing-sm);
    }
}