/* CSS переменные */
:root {
    --primary-color: #0a0a0a;
    --secondary-color: #666;
    --accent-color: #ff6b35;
    --accent-blue: #4ecdc4;
    --accent-purple: #9b59b6;
    --accent-yellow: #f7dc6f;
    --accent-red: #e74c3c;
    --bg-color: #f8f9fa;
    --white: #ffffff;
    --black: #1a1a1a;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.618;
    color: var(--primary-color);
    background-color: var(--bg-color);
    padding: 2rem 0;
    position: relative;
    overflow-x: hidden;
}

body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
}

body::before {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.08) 0%, transparent 70%);
    top: -100px;
    right: -100px;
}

body::after {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(78, 205, 196, 0.08) 0%, transparent 70%);
    bottom: 10%;
    left: -50px;
}

/* Типографика */
h1 {
    font-size: 2.618rem;
    font-weight: 600;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 1.618rem;
    font-weight: 600;
}

h3 {
    font-size: 1.272rem;
    font-weight: 500;
}

/* Хедер */
header {
    position: sticky;
    top: 2rem;
    z-index: 100;
    max-width: 1200px;
    margin: 0 auto 4rem;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.logo {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.logo:hover {
    color: var(--accent-purple);
    transform: translateY(-2px);
}

nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

nav ul {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    align-items: center;
}

nav li {
    background: var(--white);
    border-radius: 16px;
    transition: all 0.3s ease;
}

nav li:nth-child(1) {
    border: 3px solid var(--accent-color);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.2);
}

nav li:nth-child(2) {
    border: 3px solid var(--accent-blue);
    box-shadow: 0 4px 16px rgba(78, 205, 196, 0.2);
}

nav li:nth-child(3) {
    border: 3px solid var(--accent-purple);
    box-shadow: 0 4px 16px rgba(155, 89, 182, 0.2);
}

nav li:nth-child(4) {
    border: 3px solid var(--accent-yellow);
    box-shadow: 0 4px 16px rgba(247, 220, 111, 0.2);
}

nav li a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
    padding: 1rem 1.8rem;
    display: block;
}

nav li:hover {
    transform: translateY(-2px);
}

nav li:nth-child(1):hover {
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

nav li:nth-child(2):hover {
    box-shadow: 0 6px 20px rgba(78, 205, 196, 0.4);
}

nav li:nth-child(3):hover {
    box-shadow: 0 6px 20px rgba(155, 89, 182, 0.4);
}

nav li:nth-child(4):hover {
    box-shadow: 0 6px 20px rgba(247, 220, 111, 0.4);
}

/* Главный контейнер */
.page-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 3rem;
    position: relative;
    z-index: 1;
}

/* Футер */
footer {
    background: var(--white);
    margin: 5rem 0 0 0;
    padding: 4rem 0;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    position: relative;
    z-index: 1;
}

.footer-container {
    padding: 0 3rem;
    text-align: center;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* Адаптивность */
@media (max-width: 768px) {
    body {
        padding: 1rem 0;
    }

    header {
        top: 1rem;
        margin: 0 1rem 2rem;
    }

    .header-container {
        flex-direction: column;
        gap: 2rem;
    }

    .logo {
        font-size: 1.8rem;
    }

    nav {
        width: 100%;
        justify-content: center;
    }

    nav ul {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav li a {
        font-size: 0.75rem;
        padding: 0.8rem 1.3rem;
    }

    .page-wrapper {
        padding: 0 1.5rem;
    }
}