/* ==============================================
   CSS CONFIGURATION
   These must match the JS CONFIG values below
   ============================================== */
:root {
    /* Grid layout - must match CONFIG in JS */
    --columns-desktop: 8;
    --rows-desktop: 5;
    --columns-tablet: 5;
    --rows-tablet: 4;
    --columns-mobile: 3;
    --rows-mobile: 3;

    /* Photo aspect ratio (4:3) */
    --photo-aspect-ratio: 4 / 3;

    /* Gap between photos - exactly 1px, do not change */
    --grid-gap: 1px;

    /* Days per column */
    --days-per-column: 5;

    /* Animation speed */
    --transition-speed: 0.3s;

    /* Current values (set by JS based on screen size) */
    --current-columns: var(--columns-desktop);
    --current-rows: var(--rows-desktop);
}

/* Dark theme (default) */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-gap: #000000; /* Gap color between photos */
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: #333333;
    --overlay-bg: rgba(0, 0, 0, 0.95);
    --shadow: rgba(0, 0, 0, 0.5);
}

/* Light theme */
.light-theme {
    --bg-primary: #f5f5f5;
    --bg-secondary: #e8e8e8;
    --bg-tertiary: #d8d8d8;
    --bg-gap: #888888; /* Gap color between photos */
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #888888;
    --border-color: #cccccc;
    --overlay-bg: rgba(255, 255, 255, 0.95);
    --shadow: rgba(0, 0, 0, 0.2);
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition-speed), color var(--transition-speed);
}

/* ===== LAYOUT ===== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: linear-gradient(to bottom, var(--bg-primary) 0%, transparent 100%);
    pointer-events: none;
}

.header > * {
    pointer-events: auto;
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition-speed);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
}

/* ===== PHOTO GRID ===== */
.grid-container {
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.grid-container::-webkit-scrollbar {
    height: 6px;
}

.grid-container::-webkit-scrollbar-track {
    background: transparent;
}

.grid-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.photo-grid {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 0; /* No gap - using margin instead for consistent 1px spacing */
    padding: 0;
    height: calc(100vh - 100px);
    height: calc(100dvh - 100px);
    background: var(--bg-gap); /* Gap color shows through between photos */
}

.photo-cell {
    /* Calculate exact pixel dimensions - account for 1px margin between cells */
    --cell-height: calc((100vh - 100px - var(--rows-desktop) * 1px) / var(--rows-desktop));
    --cell-width: calc(var(--cell-height) * 4 / 3);
    width: var(--cell-width);
    height: var(--cell-height);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    border-radius: 0;
    cursor: pointer;
    background: var(--bg-secondary);
    /* 1px margin creates consistent gap - black background shows through */
    margin: 0 1px 1px 0;
}

.photo-cell:hover {
    /* No size increase - just subtle brightness change */
    filter: brightness(1.1);
}

.photo-cell img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}

.photo-cell img.loading {
    opacity: 0;
}

.photo-cell .photo-date-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 4px 8px;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    font-size: 0.7rem;
    color: #fff;
    opacity: 0;
    transition: opacity 0.2s;
}

.photo-cell:hover .photo-date-overlay {
    opacity: 1;
}

/* ===== SLIDER SECTION ===== */
.slider-section {
    padding: 15px 20px 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.slider-container {
    max-width: 100%;
}

.day-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-tertiary);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

.day-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px var(--shadow);
    transition: transform 0.15s;
}

.day-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.day-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px var(--shadow);
}

.slider-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
}

.current-date {
    font-size: 1.5rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.month-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 5px;
    padding: 0 12px;
}

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.97);
    z-index: 1000;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    overflow: hidden;
}

.modal-overlay.active {
    display: block;
}

.modal-overlay.visible {
    opacity: 1;
}

.modal-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-image-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: pinch-zoom pan-y;
}

.modal-image {
    max-width: 95vw;
    max-height: 95vh;
    object-fit: contain;
    display: block;
    border-radius: 4px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
}

/* Caption overlay at bottom */
.modal-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 60px 30px 30px;
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.5) 60%, transparent 100%);
    color: #fff;
    pointer-events: none;
}

.modal-caption > * {
    pointer-events: auto;
}

.modal-caption-inner {
    max-width: 600px;
}

.modal-date {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 6px;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.modal-desc {
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: 10px;
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.modal-link {
    display: inline-block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 6px 14px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    transition: all 0.2s;
    backdrop-filter: blur(4px);
}

.modal-link:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
}

.modal-exif {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 12px;
    line-height: 1.5;
}

/* Map container - bottom right corner */
.modal-map-container {
    position: absolute;
    bottom: 30px;
    right: 30px;
    width: 180px;
    height: 120px;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    display: none;
    z-index: 10;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
}

.modal-map-container:hover {
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.4);
}

.modal-map-container.visible {
    display: block;
}

#modalMap {
    width: 100%;
    height: 100%;
}

/* Override Leaflet styles */
.leaflet-container {
    background: #1a1a1a;
}

.leaflet-control-attribution {
    display: none;
}

/* Custom marker style */
.custom-marker {
    width: 16px;
    height: 16px;
    background: #fff;
    border: 3px solid rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

/* Close button */
.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 1001;
    backdrop-filter: blur(4px);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

/* Navigation buttons */
.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    width: 54px;
    height: 54px;
    font-size: 1.6rem;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 1001;
    backdrop-filter: blur(4px);
}

.modal-nav:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.modal-nav.prev {
    left: 20px;
}

.modal-nav.next {
    right: 20px;
}

/* ===== LOADING STATE ===== */
.loading-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .photo-grid {
        height: calc(100vh - 120px);
        height: calc(100dvh - 120px);
    }

    .photo-cell {
        --cell-height: calc((100vh - 120px - var(--rows-tablet) * 1px) / var(--rows-tablet));
        --cell-width: calc(var(--cell-height) * 4 / 3);
    }

    .header {
        padding: 10px 15px;
    }

    .modal-nav {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    .modal-nav.prev {
        left: 10px;
    }

    .modal-nav.next {
        right: 10px;
    }
}

@media (max-width: 600px) {
    .photo-grid {
        height: calc(100vh - 130px);
        height: calc(100dvh - 130px);
    }

    .photo-cell {
        --cell-height: calc((100vh - 130px - var(--rows-mobile) * 1px) / var(--rows-mobile));
        --cell-width: calc(var(--cell-height) * 4 / 3);
    }

    .current-date {
        font-size: 1.2rem;
    }

    .month-labels span {
        font-size: 0.65rem;
    }

    .modal-caption {
        padding: 15px;
    }

    .modal-desc {
        font-size: 1rem;
    }

    .modal-close {
        top: 10px;
        right: 10px;
        width: 38px;
        height: 38px;
    }

    .modal-nav {
        display: none;
    }

    .modal-caption {
        padding: 40px 20px 20px;
    }

    .modal-desc {
        font-size: 1.1rem;
    }

    .modal-map-container {
        width: 140px;
        height: 95px;
        bottom: 20px;
        right: 20px;
    }
}