body {
        margin: 0;
        font-family: 'Segoe UI', Roboto, sans-serif;
        background: linear-gradient(135deg, #0f0f0f, #1a1a1a);
        color: #fff;
        overflow-x: hidden;
    }
    a { text-decoration: none; color: inherit; }

    header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 30px 60px;
        position: fixed;
        width: 100%;
        background: rgba(0,0,0,0.8);
        border-bottom: 1px solid rgba(255,255,255,0.1);
        z-index: 999;
    }
    .logo { font-size: 32px; font-weight: bold; background: linear-gradient(90deg,#00f9ff,#ff00ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: 2px; }
    nav a { margin-left: 30px; padding: 15px 20px; border-radius: 12px; transition: 0.3s; font-size: 18px; }
    nav a:hover { background: rgba(255,255,255,0.1); }

    .hero {
        text-align: center;
        padding: 180px 60px 120px;
        background: radial-gradient(circle at top, #1a1a1a, #0f0f0f);
    }
    .hero h1 { font-size: 64px; background: linear-gradient(90deg,#00f9ff,#ff00ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 20px; }
    .hero p { font-size: 24px; color: rgba(255,255,255,0.9); margin-bottom: 50px; max-width: 800px; margin-left:auto;margin-right:auto; }
    .hero .btn { padding: 20px 50px; font-size: 20px; border-radius: 16px; border:none; cursor:pointer; background: linear-gradient(135deg,#00f9ff,#ff00ff); transition: transform 0.3s, box-shadow 0.3s; }
    .hero .btn:hover { box-shadow: 0 12px 30px rgba(0,0,0,0.4); }

    section { padding: 100px 20px; max-width: 1400px; margin:0 auto; }

    .features {
        display: grid;
        grid-template-columns: repeat(auto-fit,minmax(300px,1fr));
        gap: 40px;
    }
    .feature-card {
        background: rgba(255,255,255,0.05);
        border-radius: 20px;
        padding: 40px 20px;
        text-align: center;
        transition: 0.5s;
        font-size: 22px;
    }
    .feature-card h3 { margin-bottom: 15px; color: #00f9ff; font-size:33px; }
    .feature-card p { color: rgba(255,255,255,0.9); font-size:19px; }

    footer { text-align:center; padding:60px 20px; color: rgba(255,255,255,0.5); border-top:1px solid rgba(255,255,255,0.1); font-size:18px; }

    /* Анимация появления при скролле */
    .fade-in {
        opacity: 0;
        transition: all 1s ease-out;
    }
    .fade-in.visible {
        opacity: 1;
    }

    .hero {
        /* Путь к вашей картинке */
        background-image: url('signals_chart.jpg');
        
        /* Подгонка картинки под блок */
        background-size: cover;       /* картинка покрывает весь блок */
        background-position: center;  /* центрируем картинку */
        background-repeat: no-repeat; /* не повторяем */
        
        /* Высота блока (можно подстроить под экран) */
        height: 100vh; /* 100% высоты экрана */
    }