/* CSS Custom Properties */
:root {
    --color-primary: #10B981;
    --color-primary-hover: #059669;
    --color-text: #374151;
    --color-text-light: #6B7280;
    --color-white: #FFFFFF;
    --color-overlay: rgba(0, 0, 0, 0.35);
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --border-radius-sm: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

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

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

/* Hero Container */
.hero-container {
    min-height: 100vh;
    background: linear-gradient(var(--color-overlay), var(--color-overlay)),
                url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2073&q=80') center/cover no-repeat fixed;
    background-attachment: fixed;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Fallback for browsers that don't support background-attachment: fixed on mobile */
@media (max-width: 767px) {
    .hero-container {
        background-attachment: scroll;
    }
}

/* Header */
.header {
    padding: var(--spacing-lg) var(--spacing-md);
    position: relative;
    z-index: 10;
}

.logo-link {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.2s ease;
}

.logo-link:hover,
.logo-link:focus {
    transform: scale(1.05);
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--border-radius-sm);
}

.logo {
    height: auto;
    max-width: 100%;
    filter: brightness(0) invert(1); /* Make logo white */
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

.content-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    max-width: 760px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.headline {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    line-height: 1.2;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-2xl);
    font-weight: 400;
}

/* Button Container */
.button-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius-lg);
    transition: all 0.2s ease;
    min-width: 200px;
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.3);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    position: relative;
    z-index: 10;
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover,
.footer-link:focus {
    color: var(--color-white);
    text-decoration: underline;
}

/* Responsive Design */
@media (min-width: 768px) {
    .header {
        padding: var(--spacing-xl) var(--spacing-2xl);
    }
    
    .main-content {
        padding: var(--spacing-2xl);
    }
    
    .content-card {
        padding: var(--spacing-2xl) 3rem;
    }
    
    .headline {
        font-size: 2.5rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .subtitle {
        font-size: 1.25rem;
        margin-bottom: var(--spacing-2xl);
    }
    
    .button-container {
        flex-direction: row;
        gap: var(--spacing-lg);
        justify-content: center;
    }
    
    .btn {
        min-width: 220px;
        padding: var(--spacing-lg) var(--spacing-2xl);
        font-size: 1.125rem;
    }
    
    .footer {
        padding: var(--spacing-xl) var(--spacing-2xl);
    }
}

@media (min-width: 1024px) {
    .headline {
        font-size: 3rem;
    }
    
    .subtitle {
        font-size: 1.375rem;
    }
}

/* Accessibility and Motion */
@media (prefers-reduced-motion: reduce) {
    .btn,
    .logo-link {
        transition: none;
    }
    
    .btn:hover,
    .btn:focus {
        transform: none;
    }
    
    .logo-link:hover,
    .logo-link:focus {
        transform: none;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .content-card {
        background: var(--color-white);
        border: 2px solid var(--color-text);
    }
    
    .btn-secondary {
        background-color: var(--color-white);
    }
}

/* Focus Visible Support */
.btn:focus-visible,
.logo-link:focus-visible,
.footer-link:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}