html, body {
    height: 100%; /* Ensure full height for sticky positioning */
}

body {
    font-family: 'Open Sans', 'Noto Sans KR', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa; /* Lighter background */
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239C92AC' fill-opacity='0.1' fill-rule='evenodd'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E"); /* Subtle pattern */
    color: #343a40; /* Darker text for better contrast */
    line-height: 1.6;
}

header {
    background-color: #2c3e50; /* Dark blue */
    color: #fff;
    padding: 2rem 0; /* More padding */
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15); /* Stronger shadow */
    position: relative; /* For positioning the language switcher */
}

header h1 {
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem; /* Larger font size */
    font-weight: 700;
}

.map-container {
    /* Removed sticky positioning */
    background-color: #e0e0e0; /* Background for map container */
    box-shadow: 0 4px 10px rgba(0,0,0,0.1); /* Add shadow to map container */
}

#mapid {
    width: 100%;
    height: 500px; /* Taller map */
    border-bottom: 8px solid #3498db; /* Thicker border */
}

.timeline-container {
    width: 90%;
    max-width: 1200px;
    margin: 80px auto; /* More margin */
    position: relative;
    padding: 20px 0;
}

.timeline-container::before {
    content: '';
    position: absolute;
    width: 6px; /* Thicker line */
    background: linear-gradient(to bottom, #3498db, #2ecc71); /* Gradient line */
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px; /* Adjust for thicker line */
    border-radius: 3px;
}



.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
    box-sizing: border-box;
    margin-bottom: 40px; /* Space between items */
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 30px; /* Larger dot */
    height: 30px;
    background-color: #fff;
    border: 5px solid #3498db; /* Thicker border */
    top: 20px; /* Adjust position */
    border-radius: 50%;
    z-index: 1;
    box-shadow: 0 0 0 3px #f8f9fa; /* Outer glow */
}

.timeline-item.left {
    left: 0;
    padding-right: 90px; /* Space for dot and line */
}

.timeline-item.right {
    left: 50%;
    padding-left: 90px; /* Space for dot and line */
}

.timeline-item.left::after {
    right: -19px; /* Position dot on the right side of left item */
}

.timeline-item.right::after {
    left: -19px; /* Position dot on the left side of right item */
}

.timeline-item.left::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 27px; /* Adjust position */
    width: 0;
    z-index: 1;
    right: 30px;
    border: medium solid white;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent #ffffff; /* White for card background */
}

.timeline-item.right::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 27px; /* Adjust position */
    width: 0;
    z-index: 1;
    left: 30px;
    border: medium solid white;
    border-width: 10px 10px 10px 0;
    border-color: transparent #ffffff transparent transparent; /* White for card background */
}

.timeline-content {
    padding: 25px 35px; /* More padding */
    background-color: #ffffff; /* Pure white card background */
    position: relative;
    border-radius: 10px; /* More rounded corners */
    box-shadow: 0 8px 20px rgba(0,0,0,0.1); /* Stronger, softer shadow */
    display: flex;
    flex-direction: column;
    gap: 10px; /* Reduced gap for initial view */
    overflow: hidden;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    cursor: pointer; /* Indicate clickable */
    min-height: 150px; /* Ensure minimum height for initial view */
    justify-content: flex-start; /* Align content to start */
    align-items: flex-start; /* Align content to start */
}

.timeline-content:hover {
    transform: translateY(-8px); /* More pronounced lift */
    box-shadow: 0 12px 25px rgba(0,0,0,0.2); /* Stronger shadow on hover */
}

.timeline-image-wrapper {
    width: 100%;
    height: 250px; /* Taller image */
    overflow: hidden;
    border-radius: 8px; /* Rounded corners for image */
    position: relative;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1); /* Subtle shadow for image wrapper */
    /* Image is visible by default */
    transition: transform 0.4s ease-in-out;
}

.timeline-content:hover .timeline-image-wrapper .timeline-image {
    transform: scale(1.08); /* Subtle zoom on hover */
}

.timeline-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease-in-out;
}

.timeline-info-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(44, 62, 80, 0.9); /* Darker, more opaque overlay */
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0; /* Hidden by default */
    visibility: hidden; /* Hidden by default */
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    padding: 20px;
    box-sizing: border-box;
    text-align: center;
    z-index: 2; /* Ensure it's above image but below arrows */
}

.timeline-content:hover .timeline-info-overlay {
    opacity: 1; /* Show on hover */
    visibility: visible; /* Show on hover */
}

.timeline-info-overlay h3 {
    margin: 0 0 10px 0;
    font-family: 'Montserrat', sans-serif;
    font-size: 1.8rem; /* Larger font */
    font-weight: 600;
}

.timeline-info-overlay p {
    margin: 0;
    font-size: 1.1rem; /* Larger font */
}

.timeline-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.8rem; /* Larger font */
    margin-bottom: 5px; /* Adjusted margin */
    color: #2c3e50; /* Dark blue */
    font-weight: 700;
    display: block; /* Always visible */
}

.timeline-date {
    font-size: 0.95rem; /* Slightly larger */
    color: #7f8c8d;
    margin-bottom: 15px; /* Space before description/image */
    display: block; /* Always visible */
}

.timeline-description {
    font-size: 1.1rem; /* Larger font */
    color: #555;
    /* Description is visible by default */
    margin-top: 15px; /* Space after image */
}

/* Image Gallery Navigation Arrows */
.image-nav-arrows {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    z-index: 3; /* Above overlay */
    pointer-events: none; /* Allow clicks to pass through to image */
}

.image-nav-arrows .arrow {
    font-size: 2.5rem;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    padding: 0 10px;
    pointer-events: all; /* Re-enable clicks for arrows */
    transition: color 0.2s ease;
}

.image-nav-arrows .arrow:hover {
    color: #fff;
}

/* Map Marker Highlight */
.leaflet-marker-highlight {
    filter: hue-rotate(180deg) brightness(1.5); /* Example highlight effect */
    /* You might need to customize marker icons for better highlight */
}

.timeline-item-highlight {
    box-shadow: 0 0 0 4px #3498db; /* Blue border highlight */
    transform: scale(1.02); /* Slightly larger */
}

footer {
    text-align: center;
    padding: 40px; /* More padding */
    background-color: #2c3e50; /* Dark blue */
    color: #fff;
    margin-top: 80px; /* More margin */
    box-shadow: 0 -4px 10px rgba(0,0,0,0.15); /* Stronger shadow */
    font-size: 0.9rem;
    line-height: 1.8;
}

footer p {
    margin: 0;
}

/* Responsive layout */
@media screen and (max-width: 768px) {
    header {
        padding-top: 4rem; /* Add padding to avoid overlap */
    }
    .language-switcher {
        top: 15px;
        right: 15px;
        gap: 5px;
    }
    .lang-btn {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    header h1 {
        font-size: 2.2rem;
    }

    #mapid {
        height: 350px;
    }

    .timeline-container {
        width: 95%;
        margin: 40px auto;
    }

    .timeline-container::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 60px;
        padding-right: 20px;
    }

    .timeline-item.left::before,
    .timeline-item.right::before {
        border-width: 10px 10px 10px 0;
        border-color: transparent #ffffff transparent transparent;
        left: 50px;
    }

    .timeline-item.left::after,
    .timeline-item.right::after {
        left: 13px;
        top: 20px;
    }

    .timeline-item.right {
        left: 0%;
    }

    .timeline-content {
        padding: 20px 25px;
        gap: 15px;
    }

    .timeline-image-wrapper {
        height: 200px;
    }

    .timeline-info-overlay h3 {
        font-size: 1.5rem;
    }

    .timeline-info-overlay p {
        font-size: 1rem;
    }

    .timeline-title {
        font-size: 1.5rem;
    }

    .timeline-description {
        font-size: 1rem;
    }
}

@media screen and (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }

    #mapid {
        height: 300px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-item.left::before,
    .timeline-item.right::before {
        left: 40px;
    }

    .timeline-item.left::after,
    .timeline-item.right::after {
        left: 8px;
    }

    .timeline-content {
        padding: 15px 20px;
    }

    .timeline-image-wrapper {
        height: 180px;
    }

    .timeline-info-overlay h3 {
        font-size: 1.3rem;
    }

    .timeline-info-overlay p {
        font-size: 0.9rem;
    }

    .timeline-title {
        font-size: 1.3rem;
    }

    .timeline-description {
        font-size: 0.9rem;
    }
}
/* Image Gallery Navigation Dots */
.image-gallery-nav {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 2;
}

.image-gallery-nav .dot {
    width: 10px;
    height: 10px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.image-gallery-nav .dot.active {
    background-color: #fff;
}

/* Toggle Button for Full Content */
.toggle-content-btn {
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 10px;
    transition: background-color 0.3s ease;
    align-self: flex-start; /* Align to start of flex container */
}

.toggle-content-btn:hover {
    background-color: #2980b9;
}

.toggle-content-btn .arrow {
    display: inline-block;
    margin-left: 8px;
    transition: transform 0.3s ease;
}

/* Style for full content when expanded */
.full-content {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
    font-size: 1rem;
    line-height: 1.8;
    color: #444;
}

.full-content h1, .full_content h2, .full_content h3, .full_content h4, .full_content h5, .full_content h6 {
    color: #2c3e50;
    margin-top: 1em;
    margin-bottom: 0.5em;
}

.full-content p {
    margin-bottom: 1em;
}

.full-content ul, .full_content ol {
    margin-left: 20px;
    margin-bottom: 1em;
}

.full_content li {
    margin-bottom: 0.5em;
}

/* Language Switcher Styles */
.language-switcher {
    position: absolute;
    top: 20px;
    right: 30px;
    display: flex;
    gap: 10px;
}

.lang-btn {
    background-color: transparent;
    color: #fff;
    border: 1px solid #fff;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-family: 'Open Sans', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

.lang-btn:hover, .lang-btn.active {
    background-color: #fff;
    color: #2c3e50;
    font-weight: bold;
}

/* Back to Blog Link */
.back-to-blog {
    position: absolute;
    top: 28px;
    left: 30px;
    color: #fff;
    text-decoration: none;
    font-size: 1rem;
    border: 1px solid #fff;
    padding: 8px 15px;
    border-radius: 20px;
    transition: background-color 0.3s, color 0.3s;
}

.back-to-blog:hover {
    background-color: #fff;
    color: #2c3e50;
}

@media screen and (max-width: 768px) {
    .back-to-blog {
        top: 15px;
        left: 15px;
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}