:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --cyber-accent: #d946ef; /* Magenta for VVPWGEN flavor */
    --drive-accent: #22c55e; /* Green for Driving flavor */
    --spark-accent: #f59e0b; /* Amber for TuneSpark flavor */
    --nav-height: 70px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Typography */
h1, h2, h3 {
    margin-bottom: 1rem;
    line-height: 1.2;
}

h1 { font-size: 2.5rem; font-weight: 800; }
h2 { font-size: 2rem; color: var(--text-primary); }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1.5rem; color: var(--text-secondary); }
a { text-decoration: none; color: inherit; transition: var(--transition); }

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 4rem 0;
}

/* Navigation */
.navbar {
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    height: var(--nav-height);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 6rem 0;
}

.hero h1 {
    font-size: 3.5rem;
    background: linear-gradient(to right, var(--accent-color), #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Cards Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
}

.card h3 {
    margin-bottom: 0.5rem;
}

.card-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    background-color: rgba(255, 255, 255, 0.05);
}

.tag-spark { color: var(--spark-accent); border: 1px solid var(--spark-accent); }
.tag-drive { color: var(--drive-accent); border: 1px solid var(--drive-accent); }
.tag-cyber { color: var(--cyber-accent); border: 1px solid var(--cyber-accent); }

.card-content {
    flex-grow: 1;
}

.card-link {
    margin-top: 1.5rem;
    display: inline-flex;
    align-items: center;
    color: var(--accent-color);
    font-weight: 600;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

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

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

.btn-outline:hover {
    background-color: rgba(56, 189, 248, 0.1);
}

.download-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
    justify-content: center; /* Center by default */
}

.download-buttons.left-align {
    justify-content: flex-start;
}

/* Feature Lists */
.feature-list {
    list-style: none;
    margin: 2rem 0;
}

.feature-list li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Contact Form */
.contact-section {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: var(--border-radius);
    margin-top: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3); 
    border: 1px solid rgba(255, 255, 255, 0.05); 
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem; 
    margin-bottom: 0.25rem;
    text-transform: uppercase; 
    letter-spacing: 0.05em; 
}

.form-group input,
.form-group textarea {
    padding: 1rem; 
    background-color: rgba(15, 23, 42, 0.4); 
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px; 
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    width: 100%;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.25); 
    background-color: rgba(15, 23, 42, 0.8);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
    line-height: 1.6;
}

/* Honeypot field - ensuring it's hidden */
.website-url-container {
    display: none !important;
}

/* Submit Button Hover */
.contact-form button[type="submit"] {
    margin-top: 1rem;
    font-size: 1rem; 
    padding: 1rem 2rem; 
    font-weight: 700; 
    letter-spacing: 0.5px;
    cursor: pointer;
}

/* Success/Error Messages */
.form-status {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    display: none; /* JS will toggle */
    text-align: center;
}

.form-status.success {
    background-color: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border: 1px solid rgba(34, 197, 94, 0.2);
    display: block;
}

.form-status.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
    display: block;
}

/* App Specific Styles */
.app-header-spark h1 { background: linear-gradient(to right, var(--spark-accent), #fbbf24); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.app-header-drive h1 { background: linear-gradient(to right, var(--drive-accent), #4ade80); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.app-header-cyber h1 { background: linear-gradient(to right, var(--cyber-accent), #c084fc); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Disclaimer Box */
.disclaimer {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-top: 2rem;
}

/* Footer */
footer {
    background-color: #020617;
    padding: 4rem 0 2rem;
    margin-top: 4rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-nav {
    margin: 2rem 0;
    display: flex;
    gap: 1.5rem;
}

.footer-nav a {
    color: var(--text-secondary);
}

.footer-nav a:hover {
    color: var(--text-primary);
}

.copyright {
    color: #64748b;
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; } /* Ideally add a mobile menu hamburger here */
    .download-buttons { flex-direction: column; width: 100%; }
    .btn { width: 100%; }
}