/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #000;
    color: #fff;
}

.app-container {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Loading Indicator */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-container p {
    margin-top: 20px;
    font-size: 18px;
    opacity: 0.8;
}

/* Photo Container */
.photo-container {
    width: 100%;
    height: 100%;
    display: flex;
}

.hidden {
    display: none !important;
}

/* Dual Vertical Layout */
.dual-vertical-layout {
    display: flex;
    width: 100%;
    height: 100%;
}

.photo-left,
.photo-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.photo-left {
    border-right: 2px solid #000;
}

/* Single Horizontal Layout */
.single-horizontal-layout {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* Images */
.photo-left img,
.photo-right img,
.single-horizontal-layout img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    user-select: none;
    -webkit-user-drag: none;
}

/* Navigation Controls (Development Only) */
.nav-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
    z-index: 1000;
}

.nav-controls.hidden {
    display: none;
}

.nav-btn {
    padding: 12px 24px;
    font-size: 16px;
    background-color: rgba(255, 255, 255, 0.2);
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.8);
}

.nav-btn:active {
    transform: scale(0.95);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Fade Transitions */
.fade-out {
    opacity: 0;
    transition: opacity 0.3s ease-out;
}

.fade-in {
    opacity: 1;
    transition: opacity 0.3s ease-in;
}

/* Responsive adjustments for tablets */
@media (max-width: 1024px) {
    .nav-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* Hide scrollbars */
::-webkit-scrollbar {
    display: none;
}

/* Prevent text selection */
body {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}