:root {
    --black: #0a0a0a;
    --dark-gray: #1a1a1a;
    --mid-gray: #2a2a2a;
    --light-gray: #9a9a9a;
    --white: #fafafa;
    --accent: #00ff88;
    --accent-dim: #00cc6a;
    --danger: #ff4444;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--black);
    color: var(--white);
    line-height: 1.7;
    font-size: 16px;
    font-weight: 300;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--mid-gray);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--accent);
}

nav {
    display: flex;
    gap: 2rem;
}

nav a {
    color: var(--light-gray);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.2s;
}

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

/* Main content */
main {
    margin-top: 80px;
}

section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Hero */
.hero {
    text-align: center;
    padding: 10rem 2rem 8rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.tagline {
    font-size: 1.25rem;
    color: var(--light-gray);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta {
    margin-top: 2rem;
}

.btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--accent);
    color: var(--black);
    text-decoration: none;
    font-weight: 600;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 1rem;
}

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

/* Principles */
.principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    padding: 4rem 2rem;
}

.principle {
    padding: 2rem;
    background: var(--dark-gray);
    border: 1px solid var(--mid-gray);
    border-radius: 8px;
}

.principle h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent);
}

.principle p {
    color: var(--light-gray);
}

/* Verification */
.verification {
    background: var(--dark-gray);
    border: 1px solid var(--mid-gray);
    border-radius: 8px;
    padding: 4rem;
}

.verification h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.verification ul {
    list-style: none;
    margin-bottom: 2rem;
}

.verification li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--light-gray);
}

.verification li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 600;
}

.verification-box {
    background: var(--black);
    border: 1px solid var(--mid-gray);
    border-radius: 4px;
    padding: 2rem;
    font-family: 'Courier New', monospace;
}

.verification-box code {
    display: block;
    color: var(--accent);
    margin-bottom: 1rem;
}

.verification-box pre {
    color: var(--light-gray);
    line-height: 1.6;
}

/* API */
.api h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    text-align: center;
}

.endpoints {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.endpoint {
    background: var(--dark-gray);
    border: 1px solid var(--mid-gray);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.method {
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.method.get {
    background: #0066ff;
    color: white;
}

.method.post {
    background: var(--accent);
    color: var(--black);
}

.endpoint code {
    font-family: 'Courier New', monospace;
    color: var(--white);
    flex: 1;
    min-width: 300px;
}

.endpoint p {
    color: var(--light-gray);
    font-size: 0.9rem;
    width: 100%;
    margin-top: 0.5rem;
}

/* Use Cases */
.use-cases {
    text-align: center;
}

.use-cases h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
}

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

.case {
    padding: 2rem;
    background: var(--dark-gray);
    border: 1px solid var(--mid-gray);
    border-radius: 8px;
    font-weight: 400;
}

/* Contact Form */
.contact {
    max-width: 600px;
    margin: 0 auto;
}

.contact h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-align: center;
}

.contact > p {
    text-align: center;
    color: var(--light-gray);
    margin-bottom: 3rem;
}

#contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#contact-form input,
#contact-form select,
#contact-form textarea {
    padding: 1rem;
    background: var(--dark-gray);
    border: 1px solid var(--mid-gray);
    border-radius: 4px;
    color: var(--white);
    font-family: var(--font-main);
    font-size: 1rem;
}

#contact-form input:focus,
#contact-form select:focus,
#contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}

#contact-form button {
    margin-top: 1rem;
}

#form-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 4px;
    text-align: center;
    display: none;
}

#form-status.success {
    display: block;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
}

#form-status.error {
    display: block;
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}

/* Footer */
footer {
    background: var(--dark-gray);
    border-top: 1px solid var(--mid-gray);
    padding: 3rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-brand p {
    color: var(--light-gray);
    margin-top: 0.5rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: var(--light-gray);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-legal {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--mid-gray);
    text-align: center;
    color: var(--light-gray);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .principles {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 4rem 1.5rem;
    }
    
    .verification {
        padding: 2rem;
    }
    
    nav {
        gap: 1rem;
    }
}