/* ?????? ?????? (???? ?? ???? ???) */
.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

    .navbar.scrolled {
        background-color: #ffffff !important;
        box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    }

.nav-link {
    font-weight: 500;
    position: relative;
    margin: 0 8px;
}

    .nav-link:after {
        content: '';
        position: absolute;
        width: 0;
        height: 2px;
        bottom: 0;
        right: 0;
        background-color: #0d6efd;
        transition: width 0.3s ease;
    }

    .nav-link:hover:after {
        width: 100%;
        right: auto;
        left: 0;
    }

.navbar-brand {
    font-weight: 700;
    display: flex;
    align-items: center;
}

    .navbar-brand i {
        margin-left: 8px;
        font-size: 1.2em;
    }

/* ?????? ?????? ???? */
.main-content {
    min-height: calc(100vh - 120px);
    padding-top: 80px;
}

/* ?????? ???? ???? */
footer {
    background: #2c3e50;
    color: #fff;
    padding: 60px 0 20px;
    position: relative;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: inline-block;
    color: #fff;
}

    .footer-logo i {
        color: #0d6efd;
    }

.footer-about p {
    color: #ecf0f1;
    opacity: 0.8;
}

.footer-links h5 {
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

    .footer-links h5::after {
        content: '';
        position: absolute;
        right: 0;
        bottom: 0;
        width: 50px;
        height: 2px;
        background: #0d6efd;
    }

.footer-links ul {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: all 0.3s ease;
}

    .footer-links a:hover {
        color: #0d6efd;
        padding-right: 5px;
    }

.social-icons a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    margin-left: 10px;
    transition: all 0.3s ease;
}

    .social-icons a:hover {
        background: #0d6efd;
        transform: translateY(-5px);
    }

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    margin-top: 40px;
    text-align: center;
    color: #bdc3c7;
    font-size: 0.9rem;
}

.back-to-top {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: #0d6efd;
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    font-size: 1.2rem;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

    .back-to-top:hover {
        background: #0b5ed7;
        transform: translateX(-50%) translateY(-5px);
    }