body {
    min-width: 360px;
}
header {
    position: sticky;
    top: 0;
    z-index: 99;
}
.navbar-dark {
    background-color: #111;
}
.navbar-dark .navbar-nav {
    margin-right: 20px;
}
.navbar-dark .navbar-nav .nav-item {
    text-align: center;
}
.navbar-dark .navbar-nav .nav-link {
    padding: 10px;
    margin: 0 5px;
    color: #fff;
    font-size: 1.2em;
    line-height: 1.2em;
    border-bottom: 2px solid #111;
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link:focus,
.navbar-dark .navbar-nav .nav-link.active {
    color: #ffc107;
    border-bottom: 2px solid #ffc107;
}
.navbar-dark .navbar-brand img {
    height: 60px;
    margin: 20px 30px;
}
@media(max-width:539px) {
    .navbar-dark .navbar-brand img {
        height: 50px;
    }
}

.hero-banner {
    width: 100%;
    height: 80vh;
    background-image: url('../img/main.webp');
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-align: center;
}

.hero-banner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.hero-content {
    z-index: 2;
    padding: 20px;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: bold;
    text-shadow: 2px 2px 4px #000;
}

.main-content {
    padding-top: 40px;
    padding-bottom: 40px;
}
.main-content h2 {
    font-size: 32px;
    color: #a38426;
    margin-bottom: 40px;
}
.main-content h3 {
    font-size: 28px;
    color: #333;
}
.main-content h4 {
    font-size: 24px;
    color: #a38426;
}
.main-content h5 {
    font-size: 22px;
    font-weight: bolder;
    color: #333;
}
.main-content p {
    font-size: 18px;
    line-height: 1.6;
    text-align: justify;
}
.main-content li {
    font-size: 16px;
    line-height: 1.5;
}
.main-content a {
    color: #333;
    text-decoration: none;
}
.main-content a:hover {
    color: #a52a2a;
    text-decoration: underline;
}
.main-content img {
    max-width: 40%;
}
@media( max-width: 599px) {
    .main-content img {
        width: 90%;
        max-width: 90%;
        margin: 10px 5%;
    }
}

.main-footer {
    background-color: #4b4b4d;
    color: #fff;
    padding: 40px 0;
}

.main-footer a {
    color: #fff;
    text-decoration: none;
}

.main-footer a:hover {
    text-decoration: underline;
}

.main-footer img {
    width: 48px;
}

.copyright-footer {
    background-color: #4b4b4d;
    color: #ccc;
    text-align: center;
    padding: 15px 0;
    font-size: 0.9em;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.copyright-footer a {
    color: #fff;
    text-decoration: none;
}
.copyright-footer a:hover {
    color: #ccc;
    text-decoration: underline;
}

a.btn-frame {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border: 1px solid #fff;
}

.page_box {
  display: inline-block;
  vertical-align: top;
  width: 23%;
  margin: 2% 2% 2% 0;
  padding: 5px 10px;
}
@media( max-width: 499px) {
    .page_box {
        width: 31%;
        margin: 2% 2% 2% 0;    
    }
}
.page_box a {
  display: block;
  text-align: center;
}
.page_box img {
  max-width: 100%;
}
.page_box:hover {
  outline: 2px solid #ccc;
  background: #eee;
}

#gallery .gallery-item {
    display: inline-block;
    width:49%;
}
#gallery .gallery-item img {
    margin: 0 5px 10px 5px;
    max-width: 100% !important;
}
#gallery .gallery-item img:hover {
    border: 1px solid #999;
}
.main-content .collapse {
    display: block !important;
}