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

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

.periodic-table {
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    gap: 2px;
}

.element {
    aspect-ratio: 1;
    padding: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 12px;
    text-align: center;
}

.atomic-number {
    font-size: 10px;
    align-self: flex-start;
}

.symbol {
    font-size: 16px;
    font-weight: bold;
    margin: 2px 0;
}

.name {
    font-size: 10px;
}

/* 元素类型的颜色 */
.alkali-metal { background-color: #ff9933; }
.alkaline-earth { background-color: #ffff66; }
.transition-metal { background-color: #ff99cc; }
.post-transition-metal { background-color: #99ccff; }
.metalloid { background-color: #99ff99; }
.nonmetal { background-color: #00ff00; }
.halogen { background-color: #99ff33; }
.noble-gas { background-color: #66ffff; }
.lanthanide { background-color: #ffcccc; }
.actinide { background-color: #ff99ff; }
.unknown { background-color: #cccccc; }

.empty {
    visibility: hidden;
}

.description {
    margin-top: 30px;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}