* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

#container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

#controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    flex-wrap: wrap;
    gap: 20px;
}

#load-button, #retry-button {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: bold;
    color: white;
    background: linear-gradient(45deg, #ff6b6b, #ff8e53);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 10px rgba(255, 107, 107, 0.3);
}

#load-button:hover, #retry-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

#load-button:active, #retry-button:active {
    transform: translateY(0);
}

#progress-container {
    flex: 1;
    max-width: 400px;
    margin: 0 20px;
}

#progress-bar {
    width: 100%;
    height: 20px;
    background: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 8px;
}

#progress-fill {
    height: 100%;
    background: linear-gradient(45deg, #4ecdc4, #44a08d);
    transition: width 0.3s ease;
    width: 0%;
}

#progress-text {
    font-size: 14px;
    color: #666;
    font-weight: bold;
}

#color-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

#color-info span {
    font-weight: bold;
    color: #666;
}

#sort-method {
    padding: 8px 16px;
    border: 2px solid #ddd;
    border-radius: 6px;
    background: white;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

#sort-method:focus {
    outline: none;
    border-color: #667eea;
}

#visualization {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    min-height: 600px;
}

#color-chart {
    width: 100%;
    height: 100%;
    min-height: 600px;
}

.image-tile {
    cursor: pointer;
    transition: all 0.3s ease;
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.2));
}

.image-tile:hover {
    transform: scale(1.05);
    filter: drop-shadow(4px 4px 8px rgba(0, 0, 0, 0.3));
}

.color-indicator {
    stroke: #fff;
    stroke-width: 2;
    cursor: pointer;
    transition: all 0.3s ease;
}

.color-indicator:hover {
    stroke-width: 3;
    filter: brightness(1.1);
}

/* Loading screen styling */
#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    z-index: 1000;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 6px solid #333;
    border-top: 6px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#loading p {
    font-size: 18px;
    text-align: center;
    margin-top: 20px;
}

/* Error screen styling */
#error {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
    z-index: 1000;
}

#error p {
    font-size: 18px;
    color: #ff6b6b;
    margin-bottom: 30px;
    max-width: 600px;
}

/* Hidden class */
.hidden {
    display: none !important;
}

/* Responsive design */
@media (max-width: 768px) {
    #container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    #controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    #progress-container {
        max-width: 100%;
        margin: 0;
    }
    
    #color-info {
        justify-content: center;
    }
}

/* Tooltip styles */
.tooltip {
    position: absolute;
    padding: 12px;
    background: rgba(0, 0, 0, 0.95);
    color: white;
    border-radius: 8px;
    pointer-events: none;
    font-size: 13px;
    z-index: 1000;
    max-width: 220px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tooltip img {
    display: block;
    margin: 0 auto;
}