/* Base styles and reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Controls and Legend */
.controls {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.legend {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    max-width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.5rem 1rem;
}

.legend h3 {
    margin-bottom: 1rem;
    grid-column: 1 / -1;
    font-size: 1.2rem;
    color: #2c3e50;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 0.5rem;
}

.legend-item {
    display: flex;
    align-items: center;
    padding: 0.4rem 0.2rem;
    transition: background-color 0.2s;
    border-radius: 4px;
}

.legend-item:hover {
    background-color: #f8f9fa;
}

.color-box {
    width: 24px;
    height: 24px;
    margin-right: 0.8rem;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
    border: 1px solid rgba(0,0,0,0.1);
}

/* Element Category Colors */

/* Element Categories Colors */
:root {
    --alkali-metals-color: #FF6B6B;
    --alkaline-earth-metals-color: #4ECDC4;
    --transition-metals-color: #FFD93D;
    --post-transition-metals-color: #95A5A6;
    --metalloids-color: #2ECC71;
    --nonmetals-color: #87CEEB;
    --halogens-color: #F1C40F;
    --noble-gases-color: #9B59B6;
    --lanthanoids-color: #E67E22;
    --actinoids-color: #E74C3C;
    --unknown-color: #95a5a6;
}

/* Element Category Colors */
.color-box.alkali-metals,
.element.alkali-metals,
.element-symbol.alkali-metals { background-color: var(--alkali-metals-color); }

.color-box.alkaline-earth-metals,
.element.alkaline-earth-metals,
.element-symbol.alkaline-earth-metals { background-color: var(--alkaline-earth-metals-color); }

.color-box.transition-metals,
.element.transition-metals,
.element-symbol.transition-metals { background-color: var(--transition-metals-color); }

.color-box.post-transition-metals,
.element.post-transition-metals,
.element-symbol.post-transition-metals { background-color: var(--post-transition-metals-color); }

.color-box.metalloids,
.element.metalloids,
.element-symbol.metalloids { background-color: var(--metalloids-color); }

.color-box.nonmetals,
.element.nonmetals,
.element-symbol.nonmetals { background-color: var(--nonmetals-color); }

.color-box.halogens,
.element.halogens,
.element-symbol.halogens { background-color: var(--halogens-color); }

.color-box.noble-gases,
.element.noble-gases,
.element-symbol.noble-gases { background-color: var(--noble-gases-color); }

.color-box.lanthanoids,
.element.lanthanoids,
.element-symbol.lanthanoids { background-color: var(--lanthanoids-color); }

.color-box.actinoids,
.element.actinoids,
.element-symbol.actinoids { background-color: var(--actinoids-color); }

.color-box.unknown,
.element.unknown,
.element-symbol.unknown { background-color: var(--unknown-color); }

.element.alkali-metals { background-color: var(--alkali-metals-color); }
.element.alkaline-earth-metals { background-color: var(--alkaline-earth-metals-color); }
.element.transition-metals { background-color: var(--transition-metals-color); }
.element.post-transition-metals { background-color: var(--post-transition-metals-color); }
.element.metalloids { background-color: var(--metalloids-color); }
.element.nonmetals { background-color: var(--nonmetals-color); }
.element.halogens { background-color: var(--halogens-color); }
.element.noble-gases { background-color: var(--noble-gases-color); }
.element.lanthanoids { background-color: var(--lanthanoids-color); }
.element.actinoids { background-color: var(--actinoids-color); }
.element.unknown { background-color: var(--unknown-color); }

/* Periodic Table Grid */
.periodic-table-container {
    overflow-x: auto;
}

.periodic-table {
    display: grid;
    grid-template-columns: repeat(18, minmax(45px, 1fr));
    gap: 3px;
    margin: 0 auto;
}

.element {
    aspect-ratio: 1;
    padding: 0.3rem;
    background-color: white;
    border-radius: 3px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
    height: auto;
}

.element:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    z-index: 1;
}

.element .number {
    font-size: 0.7rem;
    opacity: 0.7;
}

.element .symbol {
    font-size: 1rem;
    font-weight: bold;
    margin: 0.1rem 0;
}

.element .name {
    font-size: 0.8rem;
}

.element .mass {
    font-size: 0.7rem;
    opacity: 0.7;
}

/* Popup Styles */
.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    z-index: 1000;
}

.popup.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.popup-content {
    background-color: white;
    padding: 1.25rem;
    border-radius: 8px;
    max-width: 700px;
    width: 95%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #666;
}

/* Element Details Styling */
.element-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.element-symbol {
    font-size: 3rem;
    font-weight: bold;
    padding: 0.75rem;
    border-radius: 8px;
    min-width: 80px;
    text-align: center;
    color: white;
}



.element-properties {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.property-group {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
}

.property {
    margin: 0.5rem 0;
    display: flex;
    justify-content: space-between;
}

/* Atomic Visualization */
.atomic-visualization {
    margin-top: 1rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

#atomic-canvas {
    background-color: #1a1a1a;
    border-radius: 8px;
    margin: 0.5rem 0;
    width: 250px;
    height: 250px;
}

.animation-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0.5rem;
}

#zoom-level {
    height: 100px;
    writing-mode: bt-lr; /* For older browsers */
    -webkit-appearance: slider-vertical; /* For WebKit browsers */
    width: 20px;
    margin: 0.5rem 0;
}

#animation-speed {
    width: 200px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .periodic-table {
        grid-template-columns: repeat(18, minmax(40px, 1fr));
    }
}

@media (max-width: 768px) {
    main {
        padding: 1rem;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .periodic-table {
        grid-template-columns: repeat(18, minmax(30px, 1fr));
    }
    
    .element .symbol {
        font-size: 0.9rem;
    }
    
    .element .name {
        font-size: 0.65rem;
    }
}

@media (max-width: 480px) {
    .popup-content {
        padding: 0.75rem;
        width: 98%;
    }
    
    .element-header {
        flex-direction: row;
        gap: 0.5rem;
    }
    
    .element-symbol {
        font-size: 2.5rem;
        padding: 0.5rem;
        min-width: 60px;
    }
    
    .element-properties {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    #atomic-canvas {
        width: 200px;
        height: 200px;
    }
}