:root {
    --bg-color: #f9f9f9;
    --text-color: #1a1a1a;
    --grid-gap: 24px;
}

body {
    /* Using Neutral BP and standard fallbacks if it's not installed system-wide */
    font-family: 'Neutral BP', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 40px;
    line-height: 1.6;
}

h1, h2, h3 {
    font-family: 'Neutral BP Bold', 'Neutral BP', 'Helvetica Neue', Arial, sans-serif;
    font-weight: bold;
}

header {
    margin-bottom: 40px;
    text-align: center;
    border-bottom: 2px solid #ddd;
    padding-bottom: 20px;
}

header h1 {
    margin: 0;
    font-size: 2rem;
    letter-spacing: -0.02em;
}

/* Gallery Grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--grid-gap);
    max-width: 1400px;
    margin: 0 auto;
}

.gallery-item {
    background: #fff;
    padding: 12px;
    border: 1px solid #ddd;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    color: inherit;
    display: block;
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}

.gallery-item img {
    width: 100%;
    height: auto;
    border-bottom: 1px solid #eee;
    margin-bottom: 12px;
    background: #eaeaea; /* placeholder color */
    object-fit: cover;
    aspect-ratio: 3 / 2;
}

.gallery-item h3 {
    font-size: 1.1rem;
    margin: 0;
    color: #333;
}

/* Individual Postcard Page */
.postcard-detail {
    max-width: 900px;
    margin: 0 auto;
    background: #fff;
    padding: 40px;
    border: 1px solid #ddd;
}

.back-link {
    display: inline-block;
    margin-bottom: 24px;
    color: #555;
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.back-link:hover {
    color: #000;
    text-decoration: underline;
}

.postcard-images {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-top: 30px;
}

.postcard-view {
    text-align: center;
}

.postcard-view h3 {
    text-align: center;
    margin-bottom: 16px;
    color: #666;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.postcard-view .image-wrapper > img,
.postcard-view > img {
    width: 100%;
    height: auto;
    border: 1px solid #ccc;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    cursor: zoom-in;
    transition: transform 0.2s;
}

.postcard-view .image-wrapper > img:hover,
.postcard-view > img:hover {
    transform: scale(1.02);
}

/* Zoom Modal */
#zoom-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    z-index: 9999;
    overflow: auto;
    cursor: zoom-out;
}

#zoom-modal.active {
    display: block;
}

#zoom-modal img {
    display: block;
    margin: 5vh auto;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    /* Smooth zooming transition */
    transition: width 0.05s linear;
}

#zoom-controls {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.95);
    padding: 12px 25px;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    z-index: 10000;
    display: flex;
    align-items: center;
    gap: 15px;
    color: #333;
    font-family: sans-serif;
}

#zoom-controls::before {
    content: "−";
    font-weight: bold;
    font-size: 1.5rem;
    cursor: default;
}

#zoom-controls::after {
    content: "+";
    font-weight: bold;
    font-size: 1.5rem;
    cursor: default;
}

#zoom-slider {
    width: 250px;
    cursor: ew-resize;
}

#zoom-close {
    position: fixed;
    top: 25px;
    right: 30px;
    color: white;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10001;
    background: rgba(0, 0, 0, 0.6);
    width: 50px;
    height: 50px;
    line-height: 48px;
    text-align: center;
    border-radius: 50%;
    user-select: none;
    font-family: Arial, sans-serif;
    transition: background 0.2s ease, transform 0.1s ease;
}

#zoom-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

/* Tags and Filters */
.tags {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
}

.tag {
    background: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 3px 10px;
    font-size: 0.75rem;
    color: #555;
    font-weight: bold;
}

.tag-loc {
    background: #e3f2fd;
    border-color: #bbdefb;
    color: #0d47a1;
}

.tag-cat {
    background: #f1f8e9;
    border-color: #dcedc8;
    color: #33691e;
}

.filters {
    text-align: center;
    margin-bottom: 40px;
}

.filter-btn {
    border: 1px solid #ccc;
    background: white;
    padding: 8px 18px;
    margin: 5px;
    cursor: pointer;
    border-radius: 20px;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.filter-btn.active, .filter-btn:hover {
    background: #333;
    color: white;
    border-color: #333;
}

.image-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

.bounding-box {
    position: absolute;
    border: 3px solid; /* Color set inline */
    background-color: transparent;
    pointer-events: none; /* Allows clicks to pass through to the image for zooming */
    transition: background-color 0.2s ease, opacity 0.2s ease;
    z-index: 10;
}

.bounding-box.highlight {
    background-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8) inset;
}

.image-wrapper.hide-boxes .bounding-box {
    opacity: 0 !important;
}

.tag[data-loc] {
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.tag[data-loc]:hover {
    background: #ff3b30;
    color: white;
    border-color: #ff3b30;
}