:root {
    --bg: #fafafa;
    --text: #1a1a1a;
    --text-secondary: #737373;
    --border: #e5e5e5;
    --accent: #1a1a1a;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111111;
        --text: #e5e5e5;
        --text-secondary: #8a8a8a;
        --border: #262626;
        --accent: #e5e5e5;
    }
}

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

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

header > .container {
    border-bottom: 1px solid var(--border);
}

.about > .container,
.advantages > .container,
.applications > .container,
.contact > .container,
footer > .container {
    border-top: 1px solid var(--border);
}

/* Header */
header {
    padding-top: 3rem;
    padding-bottom: 3rem;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tagline {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.05em;
}

.separator {
    color: var(--border);
    font-weight: 300;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 400;
    transition: color 0.2s ease;
}

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

/* Hero */
.hero {
    padding-top: 8rem;
    padding-bottom: 6rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 2rem;
    max-width: 750px;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.65;
    max-width: 600px;
}

.cta {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    background: var(--accent);
    color: var(--bg);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 2px;
    transition: opacity 0.2s ease;
}

.cta:hover {
    opacity: 0.85;
}

/* About */
.about {
    padding-top: 8rem;
    padding-bottom: 0;
}

.about > .container {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.about + .advantages {
    padding-top: 0;
}

.about p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 1rem;
}

.about p:last-child {
    margin-bottom: 0;
}

/* Advantages */
.advantages {
    padding-top: 8rem;
    padding-bottom: 0;
}

.advantages > .container {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.advantages + .applications {
    padding-top: 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 4rem 3rem;
}

.advantage h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.advantage p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Applications */
.applications {
    padding-top: 8rem;
    padding-bottom: 0;
}

.applications > .container {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.applications + .contact {
    padding-top: 0;
}

.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.applications-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
}

.app-item {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Contact */
.contact {
    padding-top: 8rem;
    padding-bottom: 0;
}

.contact > .container {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.contact + footer {
    padding-top: 0;
}

.contact-content {
    max-width: 600px;
}

.contact h2 {
    font-size: 2rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.contact p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
    line-height: 1.65;
}

/* Footer */
footer {
    padding-top: 3rem;
    padding-bottom: 3rem;
}

footer p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .logo {
        font-size: 1.25rem;
        gap: 0.5rem;
    }
    
    .tagline {
        font-size: 0.65rem;
    }
    
    .hero {
        padding-top: 5rem;
        padding-bottom: 4rem;
    }
    
    h1 {
        font-size: 2.25rem;
    }
    
    .applications, .contact {
        padding-top: 5rem;
        padding-bottom: 5rem;
    }

    .advantages {
        padding-top: 5rem;
    }

    .advantages-grid {
        gap: 3rem 2rem;
    }
}