:root {
    --primary-color: #ffffff;
    --accent-color: #ff6f61;
    --overlay-color: rgba(0, 0, 0, 0.5);
    --font-family: 'Roboto', sans-serif;
    --max-width: 1100px;
}

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

body {
    font-family: var(--font-family);
    color: var(--primary-color);
    line-height: 1.6;
    background: url('https://multi-admin.ru/mediabank_blog/11/248087/8f425a5d663dde66070340637cbb48b83o70mgluoka.jpg') no-repeat center center fixed;
    background-size: cover;
}

.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
}

.site-header {
    background: rgba(0, 0, 0, 0.7);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.main-nav a {
    color: var(--primary-color);
    margin-left: 20px;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: var(--accent-color);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 60px; /* height of header */
}

.hero .overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-color);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: left;
    max-width: 600px;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--accent-color);
    color: #000;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 4px;
    transition: background 0.3s;
}

.btn:hover {
    /* fallback darker color (approx 10% darker than --accent-color) */
    background: #e65c52;
}

.info-section {
    padding: 60px 0;
    background: rgba(0, 0, 0, 0.6);
}

.info-section h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.info-section p,
.info-section ol {
    font-size: 1.1rem;
    margin-left: 1.25rem;
}

.site-footer {
    background: rgba(0, 0, 0, 0.8);
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

.site-footer p {
    font-size: 0.9rem;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-color);
    color: #000;
    padding: 8px 16px;
    z-index: 1001;
    text-decoration: none;
    font-weight: 700;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

@media (max-width: 768px) {
    .hero-content h2 {
        font-size: 2rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
    .main-nav a {
        margin-left: 10px;
        font-size: 0.9rem;
    }
}