:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --code-bg: #1e1e1e;
}

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

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

/* Header & Navigation */
header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* Hero Section */
#hero {
    background: linear-gradient(135deg, var(--surface-color), var(--background-color));
    padding: 8rem 2rem;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Sections */
section {
    border-bottom: 1px solid var(--border-color);
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

section p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Features Grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, border-color 0.2s;
}

.feature:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature p {
    margin: 0;
    font-size: 0.95rem;
}

/* Architecture Diagram */
.architecture-diagram {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 3rem 0;
    flex-wrap: wrap;
    gap: 1rem;
}

.arch-step {
    flex: 1;
    min-width: 200px;
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    text-align: center;
}

.arch-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-weight: bold;
}

.arch-step h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.arch-step p {
    font-size: 0.9rem;
    margin: 0;
}

.arch-arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

/* Tech Stack */
.tech-stack {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
}

.tech-stack h3 {
    margin-bottom: 1rem;
}

.tech-stack ul {
    list-style: none;
}

.tech-stack li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

.tech-stack strong {
    color: var(--primary-color);
}

/* Security Points */
.security-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.security-item {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.security-item h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.security-item ul {
    list-style: none;
    margin: 0;
}

.security-item li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

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

/* Attestation Flow */
.attestation-flow {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.flow-step {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

.flow-step ul {
    list-style: none;
    padding: 0;
}

.flow-step li {
    padding: 0.3rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.attestation-code {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
}

/* Code Blocks */
pre {
    background: var(--code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
}

code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #e2e8f0;
}

/* Demo Section */
.demo-container {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
}

.demo-status {
    margin-bottom: 2rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem 0;
    padding: 1rem;
    background: var(--background-color);
    border-radius: 8px;
}

.server-endpoint {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.server-endpoint label {
    font-weight: 600;
    color: var(--text-color);
}

.server-endpoint input {
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--background-color);
    color: var(--text-color);
}

.server-endpoint small {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--error-color);
    animation: pulse 2s infinite;
}

.status-connected .status-dot {
    background: var(--success-color);
}

.status-connecting .status-dot {
    background: var(--warning-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.demo-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s;
}

.demo-button:hover:not(:disabled) {
    transform: translateY(-2px);
}

.demo-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.demo-crypto-info {
    margin: 2rem 0;
}

.crypto-details {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: 8px;
}

.crypto-field {
    margin: 1rem 0;
}

.crypto-field label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.crypto-field code {
    display: block;
    background: var(--code-bg);
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    word-break: break-all;
}

.demo-chat {
    margin: 2rem 0;
}

.chat-messages {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: 8px;
    height: 300px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.message {
    margin: 1rem 0;
    padding: 0.75rem;
    border-radius: 8px;
}

.user-message {
    background: var(--primary-color);
    text-align: right;
    margin-left: 20%;
}

.assistant-message {
    background: var(--surface-color);
    margin-right: 20%;
}

.system-message {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

.chat-input-container {
    display: flex;
    gap: 1rem;
}

#chat-input {
    flex: 1;
    padding: 0.75rem;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
}

#chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.demo-logs {
    margin-top: 2rem;
}

.logs-container {
    background: var(--code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    height: 200px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
}

.log-entry {
    margin: 0.3rem 0;
    color: var(--text-secondary);
}

.log-entry.log-info {
    color: var(--primary-color);
}

.log-entry.log-success {
    color: var(--success-color);
}

.log-entry.log-warning {
    color: var(--warning-color);
}

.log-entry.log-error {
    color: var(--error-color);
}

/* Implementation Guide */
.implementation-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.guide-section {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

/* Network Features */
.network-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.network-feature {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.network-feature h3 {
    margin: 1rem 0;
    font-size: 1.2rem;
}

.network-feature p {
    margin: 0;
    font-size: 0.95rem;
}

.roadmap {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
}

.roadmap h3 {
    margin-bottom: 1rem;
}

.roadmap ul {
    list-style: none;
}

.roadmap li {
    padding: 0.75rem;
    margin: 0.5rem 0;
    background: var(--background-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

/* Footer */
footer {
    background: var(--surface-color);
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

footer p {
    margin: 0.5rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .architecture-diagram {
        flex-direction: column;
    }

    .arch-arrow {
        transform: rotate(90deg);
    }

    .container {
        padding: 2rem 1rem;
    }
}