:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --light-text: #6b7280;
    --background: #ffffff;
    --light-background: #f3f4f6;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --chat-bg: #f8fafc;
    --message-bg: #ffffff;
    --user-message-bg: #2563eb;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    background-color: var(--background);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
}

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

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

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(to bottom right, #2563eb11, #1e40af11);
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero .subtitle {
    font-size: 1.25rem;
    color: var(--light-text);
    margin-bottom: 2rem;
}

.company-info {
    margin-top: 2rem;
    color: var(--light-text);
    font-size: 0.9rem;
    font-style: italic;
}

/* CTA Button */
.cta-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--secondary-color);
}

/* Features Section */
.features {
    padding: 4rem 0;
    background-color: var(--background);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    padding: 2rem;
    background-color: var(--light-background);
    border-radius: 0.5rem;
    transition: transform 0.3s ease;
}

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

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* AI Chat Section */
.ai-chat {
    padding: 4rem 0;
    background-color: var(--chat-bg);
}

.chat-demo {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--background);
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.chat-messages {
    padding: 2rem;
    max-height: 400px;
    overflow-y: auto;
}

.message {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-radius: 0.5rem;
    max-width: 80%;
}

.message.assistant {
    background: var(--message-bg);
    margin-right: auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.message.user {
    background: var(--user-message-bg);
    color: white;
    margin-left: auto;
}

.message ul {
    list-style-type: none;
    margin-top: 0.5rem;
}

.message li {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.message.assistant li::before {
    content: "→";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

.chat-input {
    display: flex;
    padding: 1rem;
    background: var(--light-background);
    gap: 1rem;
    align-items: center;
}

.chat-input input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    background: var(--background);
}

.chat-input input:disabled {
    background: var(--light-background);
    cursor: not-allowed;
}

.chat-button {
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.chat-button:hover:not(:disabled) {
    background: var(--secondary-color);
}

.chat-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Privacy Section */
.privacy {
    padding: 4rem 0;
    background-color: var(--light-background);
}

.privacy-content {
    max-width: 800px;
    margin: 2rem auto;
}

.privacy-highlight {
    background-color: var(--background);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.privacy-highlight h3 {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.privacy-highlight ul {
    list-style-type: none;
    margin-top: 1rem;
}

.privacy-highlight li {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.privacy-highlight li::before {
    content: "✓";
    color: var(--success-color);
    position: absolute;
    left: 0;
}

/* Why Switch Section */
.why-switch {
    padding: 4rem 0;
    background-color: var(--background);
}

.switch-content {
    max-width: 800px;
    margin: 2rem auto;
}

.switch-content ul {
    list-style-type: none;
    margin-top: 1rem;
}

.switch-content li {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.switch-content li::before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* Security Section */
.security {
    padding: 4rem 0;
    background-color: var(--light-background);
}

.security-features {
    max-width: 800px;
    margin: 2rem auto;
}

.security-features ul {
    list-style-type: none;
    margin-top: 1rem;
}

.security-features li {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.security-features li::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* CTA Section */
.cta {
    padding: 4rem 0;
    background-color: var(--background);
    text-align: center;
}

.cta h2 {
    margin-bottom: 1rem;
}

.cta p {
    margin-bottom: 2rem;
    color: var(--light-text);
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section a {
    display: block;
    color: var(--border-color);
    text-decoration: none;
    margin: 0.5rem 0;
}

.footer-section a:hover {
    color: white;
}

.company-footer {
    color: var(--border-color);
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.company-details {
    color: var(--border-color);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .company-info {
        margin-top: 1.5rem;
        font-size: 0.8rem;
    }

    .chat-input {
        flex-direction: column;
    }

    .chat-input input {
        width: 100%;
    }

    .chat-button {
        width: 100%;
    }

    .message {
        max-width: 90%;
    }
}

/* Typography */
h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

h3 {
    font-size: 1.25rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card, .privacy-highlight, .message {
    animation: fadeIn 0.5s ease-out forwards;
}