:root {
    /* Brand Colors */
    --primary: #3591DD;
    --primary-dark: #2779bd;
    --secondary: #1a202c;
    --text-main: #2d3748;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --white: #ffffff;
    --success: #48bb78;
    --danger: #f56565;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--secondary);
    line-height: 1.2;
    font-weight: 700;
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

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

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: var(--white);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

/* --- Hero Section --- */
.hero {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 100%);
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
}

/* --- Features Grid --- */
.features {
    padding: var(--spacing-lg) 0;
}

.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: var(--spacing-md);
}

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

.card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid #e2e8f0;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 48px;
    height: 48px;
    background-color: rgba(53, 145, 221, 0.1);
    color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

/* --- Downloads Section --- */
.downloads {
    background-color: var(--bg-light);
    padding: var(--spacing-lg) 0;
}

.download-box-primary {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    border: 2px solid var(--primary);
}

.version-tag {
    background-color: #ebf8ff;
    color: var(--primary-dark);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: inline-block;
}

.advanced-downloads {
    margin-top: var(--spacing-lg);
}

.download-table {
    width: 100%;
    margin-top: var(--spacing-md);
    border-collapse: collapse;
}

.download-table th, .download-table td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid #e2e8f0;
}

.download-table th {
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.875rem;
}

.code-snippet {
    background: #2d3748;
    color: #e2e8f0;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.8rem;
}

/* --- Security Section --- */
.security {
    padding: var(--spacing-lg) 0;
}

.trust-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: #f0fff4;
    border: 1px solid #c6f6d5;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: #22543d;
}

/* --- Footer --- */
footer {
    background-color: var(--secondary);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
}

footer a {
    color: #a0aec0;
}

footer a:hover {
    color: var(--white);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.125rem;
    }

    .download-table {
        display: block;
        overflow-x: auto;
    }
}