:root {
    --primary-color: #1e90ff;
    --success-color: #2ed573;
    --danger-color: #ff4757;
    --warning-color: #ffa502;
    --light-color: #f5f5f5;
    --dark-color: #333;
    --background-color: #f0f2f5;
    --card-background: #ffffff;
    --text-color: #333;
    --border-radius: 12px;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html, body {
    background-color: var(--background-color);
    color: var(--text-color);
    height: 100%;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    text-align: center;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-title {
    font-size: 2rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--dark-color);
}

.app-title i {
    color: var(--primary-color);
}

.history-link {
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    transition: background-color 0.3s, transform 0.2s;
}

.history-link:hover {
    background-color: #1c86e3;
    transform: translateY(-2px);
}

.main-section {
    display: flex;
    gap: 24px;
    flex: 1;
    align-items: flex-start;
}

.swipe-container {
    position: relative;
    flex: 3;
    min-height: 70vh;
    perspective: 1000px;
    border-radius: var(--border-radius);
    background: var(--card-background);
    box-shadow: var(--shadow);
    border-style: solid;
    border-width: 6px;
    border-left-color: var(--danger-color);
    border-right-color: var(--success-color);
    border-top-color: var(--primary-color);
    border-bottom-color: var(--warning-color);
}

.image-card {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform 0.5s ease-out, opacity 0.5s ease-out;
    transform-origin: center center;
    background-color: var(--card-background);
    touch-action: none;
    cursor: grab;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.loading-indicator, .no-images-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #999;
    font-weight: bold;
    font-size: 1.2rem;
    text-align: center;
    padding: 20px;
}

.image-card.loading .loading-indicator {
    opacity: 1;
}

.image-card.swiping {
    transition: none;
}

.action-hint {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 10;
}

.left-hint { left: 20px; top: 50%; transform: translateY(-50%); }
.right-hint { right: 20px; top: 50%; transform: translateY(-50%); }
.up-hint { top: 20px; left: 50%; transform: translateX(-50%); }
.down-hint { bottom: 20px; left: 50%; transform: translateX(-50%); }

.side-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: sticky;
    top: 20px;
    min-width: 300px;
}

.filter-controls, .action-buttons, .status-area {
    background-color: var(--card-background);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.filter-controls h4, .action-buttons h4, .status-area h4 {
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--dark-color);
    font-size: 1.1rem;
}

.filter-buttons {
    display: flex;
    gap: 10px;
}

.filter-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    background-color: var(--light-color);
    color: var(--dark-color);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.filter-btn:hover {
    background-color: #e0e0e0;
    border-color: #ccc;
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
    font-size: 1rem;
    color: white;
}

#btn-left { background-color: var(--danger-color); }
#btn-right { background-color: var(--success-color); }
#btn-up { background-color: var(--primary-color); }
#btn-down { background-color: var(--warning-color); }

.action-btn:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.status-area {
    text-align: left;
}

#last-action {
    font-weight: bold;
    margin-top: 5px;
    margin-bottom: 15px;
}

.swipe-legend {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}

.legend-color {
    display: inline-block;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    margin-right: 8px;
}

.left-color { background-color: var(--danger-color); }
.right-color { background-color: var(--success-color); }
.up-color { background-color: var(--primary-color); }
.down-color { background-color: var(--warning-color); }

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 2000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(-10px);
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    overflow: auto;
    align-items: center;
    justify-content: center;
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 1200px;
    padding: 20px;
}

#fullscreen-image {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--border-radius);
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 30px;
    color: white;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}

.modal-info {
    margin-top: 15px;
    color: white;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    text-align: center;
}

.history-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.selection-item {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
}

.selection-item.selected {
    box-shadow: 0 0 0 3px var(--primary-color), var(--shadow);
    transform: translateY(-5px);
}

.selection-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.selection-info {
    padding: 15px;
    font-size: 0.9rem;
}

.selection-action {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    border-radius: 20px;
    color: white;
    font-weight: bold;
    font-size: 0.8rem;
}

.action-left { background-color: var(--danger-color); }
.action-right { background-color: var(--success-color); }
.action-up { background-color: var(--primary-color); }
.action-down { background-color: var(--warning-color); }

.selection-checkbox-container {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 5;
}

.selection-checkbox {
    width: 20px;
    height: 20px;
}

.selection-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: space-around;
    padding: 8px 0;
    opacity: 0;
    transition: opacity 0.3s;
}

.selection-item:hover .selection-controls {
    opacity: 1;
}

.control-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1rem;
}

@media (max-width: 992px) {
    .container {
        padding: 10px;
    }
    .main-section {
        flex-direction: column;
    }
    .side-panel {
        position: static;
        width: 100%;
    }
    .action-buttons {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: var(--card-background);
        padding: 10px;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
        z-index: 1500;
        flex-direction: row;
        border-radius: 0;
    }
    .swipe-container {
        min-height: 60vh;
    }
    .swipe-legend {
        display: none;
    }
}