/* Light Theme Defaults */
:root {
    /* Light Theme Defaults */
    --primary: #2C4A3E;
    --secondary: #8DA97C;
    --accent: #C6D4B7;
    --text-dark: #1A1F16;
    --text-light: #F5F7F3;
    --surface: #FFFFFF;
    --header-bg: rgba(255, 255, 255, 0.98);
    --card-bg: #FFFFFF;
    --hero-gradient: linear-gradient(45deg, var(--primary), #356B55);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3rem;
    
    /* Typography */
    --font-main: 'Segoe UI', system-ui;
    --font-accent: 'Raleway', sans-serif;
    --text-base: 1rem;
    --text-lg: 1.25rem;
    --text-xl: 2rem;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* Transition */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary: #8DA97C;
    --secondary: #2C4A3E;
    --accent: #4A5E48;
    --text-dark: #F5F7F3;
    --text-light: #1A1F16;
    --surface: #1A1F16;
    --header-bg: rgba(26, 31, 22, 0.98);
    --card-bg: #2C3E2F;
    --hero-gradient: linear-gradient(45deg, #1A2E22, #2C4A3E);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color var(--transition-normal), 
                color var(--transition-normal),
                border-color var(--transition-normal);
}

body {
    background: var(--surface);
    color: var(--text-dark);
    font-family: var(--font-main);
    line-height: 1.6;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    padding: var(--space-xs);
    background: var(--primary);
    color: var(--text-light);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-xs);
}

/* Header & Navigation */
.silva-header {
    background: var(--header-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    text-decoration: none;
}

.logo-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.logo-text {
    font-family: var(--font-accent);
    font-weight: 700;
    color: var(--primary);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

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

.dropdown {
    position: relative;
}

.dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--card-bg);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 1000;
}

.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
}

.nav-link,
.dropdown-link {
    color: var(--text-dark);
    text-decoration: none;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-link:hover,
.dropdown-link:hover {
    background: var(--accent);
}

/* Theme Switcher */
.theme-switcher {
    display: flex;
    gap: var(--space-xs);
}

#theme-toggle {
    background: none;
    border: none;
    padding: var(--space-xs);
    cursor: pointer;
    color: var(--text-dark);
}

#theme-toggle i {
    transition: transform var(--transition-normal);
}

#theme-toggle:hover i {
    transform: rotate(15deg);
}

/* Hero Section */
.silva-hero {
    padding: var(--space-lg) var(--space-md);
    text-align: center;
    background: var(--hero-gradient);
    color: var(--text-light);
    position: relative;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) 0;
}

.hero-title {
    font-family: var(--font-accent);
    font-size: 3.5rem;
    margin-bottom: var(--space-sm);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--text-lg);
    margin-bottom: var(--space-md);
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--secondary);
    color: var(--text-light);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition-normal);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Product Cards */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-md);
}

.product-card {
    background: var(--card-bg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-icon {
    width: 64px;
    height: 64px;
    background: var(--accent);
    border-radius: var(--radius-sm);
    display: grid;
    place-items: center;
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: var(--space-sm);
}

/* Learning Section */
.learning-showcase {
    padding: var(--space-lg) var(--space-md);
}

.learning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.learning-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.learning-card:hover {
    transform: translateY(-3px);
}

.support-card {
    background: var(--primary);
    color: var(--text-light);
}

.support-links {
    list-style: none;
    margin-top: var(--space-sm);
}

.support-link {
    color: inherit;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) 0;
    transition: var(--transition-fast);
}

.support-link:hover {
    color: var(--accent);
}

/* Enterprise Section */
.enterprise-solutions {
    background: var(--surface);
    padding: var(--space-lg) var(--space-md);
}

.enterprise-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.enterprise-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.enterprise-features li {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
    color: var(--text-dark);
}

/* Footer */
.silva-footer {
    background: var(--primary);
    color: var(--text-light);
    padding: var(--space-lg) var(--space-md);
    margin-top: var(--space-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var (--space-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.social-links {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.social-link {
    color: var(--text-light);
    font-size: 1.5rem;
    transition: var(--transition-fast);
}

.social-link:hover {
    color: var(--accent);
}

/* Back to Top */
#back-to-top {
    position: fixed;
    bottom: var(--space-md);
    right: var(--space-md);
    background: var(--secondary);
    color: var(--text-light);
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition-normal);
    display: grid;
    place-items: center;
}

#back-to-top.visible {
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .enterprise-content {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1rem;
    background: var(--secondary);
}

.auth-buttons a {
    text-decoration: none;
    color: var(--text-light);
    background: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.auth-buttons a:hover {
    background: var(--accent);
}

/* Updated Auth Modal */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5); /* subtle translucent overlay */
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.auth-modal-content {
    background: var(--surface); /* or a neutral color */
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.auth-modal-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: var(--text-light);
    border: none;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background var(--transition-fast);
}

.auth-modal-button:hover {
    background: var(--accent);
}