* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

header {
    text-align: center;
    padding: 20px 0;
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

.content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.periodic-table {
    background: white;
    border-radius: 10px;
    padding: 5px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.table-grid {
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    grid-template-rows: repeat(9, 1fr);
    gap: 2px;
    max-width: 100%;
    overflow: auto;
    min-width: 900px;
}

.element {
    aspect-ratio: 1/1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid #e0e0e0;
    font-size: 0.7rem;
    position: relative;
    min-height: 50px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.element:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    z-index: 2;
    border-color: #2563eb;
}

.element .number {
    position: absolute;
    top: -4px;
    left: 1px;
    font-size: 1.1rem;
    opacity: 0.8;
    font-weight: bold;
}

.element .symbol {
    font-weight: bold;
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 2px;
}

.element .name {
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.0rem;
    text-align: center;
    color: #666;
    width: 90%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.details-panel {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-top: 10px;
}

.details-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e9ecef;
}

.element-large {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.element-symbol {
    font-size: 3.5rem;
    font-weight: bold;
    color: #2563eb;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.element-info {
    text-align: left;
}

.element-name {
    font-size: 1.8rem;
    font-weight: bold;
    color: #333;
}

.element-number {
    color: #666;
    font-size: 1.1rem;
}

.details-content {
    max-height: 600px;
    overflow-y: auto;
    padding: 10px 0;
}

.element-image {
    text-align: center;
    margin-bottom: 25px;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 10px;
    border: 2px solid #dee2e6;
}

.element-image img {
    max-width: 200px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.element-image .image-title {
    font-weight: bold;
    color: #495057;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.property {
    display: flex;
    align-items: flex-start;
    padding: 12px 0;
    border-bottom: 1px dashed #dee2e6;
    transition: background-color 0.2s ease;
}

.property:hover {
    background-color: #f8f9fa;
    border-radius: 4px;
    padding-left: 10px;
    padding-right: 10px;
}

.property-name {
    font-weight: bold;
    color: #495057;
    font-size: 1.1rem;
    min-width: 160px;
    max-width: 160px;
    flex-shrink: 0;
    margin-right: 20px;
}

.property-value {
    color: #6c757d;
    text-align: left;
    flex: 1;
    line-height: 1.4;
    word-wrap: break-word;
    font-size: 1.05rem;
}

.loading {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 1.1rem;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #999;
    font-size: 1.1rem;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

.element.selected {
    transform: scale(1.08);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
    border-color: #2563eb;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
}

.element.selected .symbol {
    color: #1d4ed8;
}

.element.empty {
    background: transparent;
    border: none;
    cursor: default;
}

/* 元素类别颜色 */
.alkali-metal { 
    background: linear-gradient(135deg, #fecaca 0%, #f87171 100%); 
    border-color: #dc2626;
}
.alkaline-earth { 
    background: linear-gradient(135deg, #fed7aa 0%, #fb923c 100%); 
    border-color: #ea580c;
}
.transition-metal { 
    background: linear-gradient(135deg, #fef3c7 0%, #fbbf24 100%); 
    border-color: #d97706;
}
.basic-metal { 
    background: linear-gradient(135deg, #d9f99d 0%, #84cc16 100%); 
    border-color: #65a30d;
}
.semi-metal { 
    background: linear-gradient(135deg, #a7f3d0 0%, #34d399 100%); 
    border-color: #059669;
}
.non-metal { 
    background: linear-gradient(135deg, #bfdbfe 0%, #60a5fa 100%); 
    border-color: #2563eb;
}
.halogen { 
    background: linear-gradient(135deg, #c7d2fe 0%, #818cf8 100%); 
    border-color: #4f46e5;
}
.noble-gas { 
    background: linear-gradient(135deg, #e9d5ff 0%, #a78bfa 100%); 
    border-color: #7c3aed;
}
.lanthanide { 
    background: linear-gradient(135deg, #f3f4f6 0%, #9ca3af 100%); 
    border-color: #6b7280;
}
.actinide { 
    background: linear-gradient(135deg, #e5e7eb 0%, #6b7280 100%); 
    border-color: #4b5563;
}

/* 拼音样式 */
.pinyin {
    font-size: 1.2rem;
    color: #666;
    margin-left: 10px;
    font-style: italic;
}

@media (max-width: 768px) {
    .container {
        padding: 5px;
    }
    
    .periodic-table {
        padding: 3px;
        overflow-x: auto;
        overflow-y: auto;
    }
    
    .table-grid {
        min-width: 900px;
        gap: 1px;
    }
    
    .element {
        min-height: 45px;
        font-size: 0.7rem;
        padding: 1px;
    }
    
    .element .number {
        font-size: 1.0rem;
        top: -4px;
        left: 1px;
    }
    
    .element .symbol {
        font-size: 1.1rem;
    }
    
    .element .name {
        font-size: 0.8rem;
        bottom: -4px;
    }
    
    .element-symbol {
        font-size: 2.5rem;
    }
    
    .element-name {
        font-size: 1.4rem;
    }
    
    .details-panel {
        padding: 15px;
    }
    
    .property {
        flex-direction: row;
        gap: 10px;
    }
    
    .property-name {
        min-width: 120px;
        max-width: 120px;
        margin-right: 15px;
        font-size: 1.0rem;
    }
    
    .property-value {
        text-align: left;
        font-size: 1.0rem;
    }
}