/* --- Global Styles --- */
:root {
    --bg-color: #ffffff;
    --text-color: #111111;
    --gray-bg: #f9f9f9;
    --accent-color: #000000; /* Строгий черный для кнопок */
    --text-secondary: #555555;
    --spacing: 80px;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
    margin: 0 0 20px 0;
    font-weight: 700;
    line-height: 1.2;
}

p {
    margin: 0 0 20px 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Header --- */
header {
    padding: 30px 0;
}

.logo {
    height: 60px; /* Оптимально для вашего квадратного лого */
    width: auto;
}

/* --- Hero Section --- */
.hero {
    padding: 100px 0;
}

.hero h1 {
    font-size: 48px;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 16px 32px;
    background-color: var(--accent-color);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px; /* Небольшое скругление */
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.8;
}

/* --- Sections Common --- */
section {
    padding: var(--spacing) 0;
}

.section-title {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 40px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    display: inline-block;
}

/* --- Problem Grid --- */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.card h3 {
    font-size: 24px;
}

/* --- Method & Product --- */
.method {
    background-color: var(--gray-bg);
}

.lead-text {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 20px;
}

.text-block {
    max-width: 700px;
    font-size: 18px;
}

.tech-box {
    border: 1px solid #eee;
    padding: 40px;
    border-radius: 8px;
}

/* --- Expert --- */
.expert-role {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

/* --- Footer --- */
footer {
    padding: 40px 0;
    border-top: 1px solid #eee;
    font-size: 14px;
    color: var(--text-secondary);
}

/* --- Mobile Adaptation --- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: 60px 0;
    }
}