/* 横幅区域样式 */
.banner {
    text-align: center;
    padding: 4rem 2rem;
    color: white;
}

.banner h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #ffffff !important;
    font-weight: 600;
}

.banner p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
    color: white;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* 关于页面容器样式 - 深色主题 */
/* 设置页面最大宽度为80%，居中显示，添加内边距，最小高度为视口高度 */
.about-container {
    max-width: 80%;
    margin: 0 auto;
    padding: 1.5rem;
    min-height: 100vh;
}

/* 关于内容区域样式 - 现代化卡片布局 */
.about-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    color: #ffffff;
    line-height: 1.8;
}

.about-content-item {
    padding: 2.5rem;
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.4s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    max-width: 100%;
    box-sizing: border-box;
}

.about-content-item:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(77, 171, 247, 0.3);
}

/* 第三个卡片中的编辑框样式 */
.about-content-item:nth-child(3) textarea,
.about-content-item:nth-child(3) input[type="text"],
.about-content-item:nth-child(3) input[type="email"] {
    width: 100%;
    max-width: calc(100% - 4rem);
    padding: 1rem 1rem 1rem 2rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.05);
    color: white !important;
    font-size: 1.15rem;
    transition: all 0.3s ease;
    vertical-align: top;
    line-height: 1.8;
}

.about-content-item:nth-child(3) textarea:focus,
.about-content-item:nth-child(3) input[type="text"]:focus,
.about-content-item:nth-child(3) input[type="email"]:focus {
    outline: none;
    border-color: #4dabf7;
    background: rgba(255,255,255,0.1);
    box-shadow: 0 0 0 2px rgba(77, 171, 247, 0.3);
}

/* 发送按钮样式 */
.about-content-item:nth-child(3) button {
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    border: none;
    background: #4dabf7;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.about-content-item:nth-child(3) button:hover {
    background: #3a8fd4;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(77, 171, 247, 0.3);
}

/* 关于内容标题样式 */
/* 设置标题颜色为蓝色(#4dabf7)，底部外边距1.2rem，字体粗细600，大小1.5rem，字母间距0.5px */
.about-content h2 {
    color: #ffffff !important;
    margin-bottom: 1.2rem;
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: 0.5px;
}

/* 确保'关于我们'标题与其他h2标题一致 */
.about-container h2 {
    color: #ffffff !important;
    margin-bottom: 1.2rem;
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: 0.5px;
}

/* 关于内容段落样式 */
.about-content p {
    margin-bottom: 1.8rem;
    color: white;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    font-size: 1.15rem;
    font-weight: 400;
    letter-spacing: 0.4px;
}

/* 交流群卡片样式 */
.about-content-item:nth-child(4) {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about-content-item:nth-child(4) h2 {
    color: #ffffff;
    margin-bottom: 0;
}

@media (max-width: 1400px) {
    .about-content {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 1200px) {
    .about-content {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        padding: 2rem;
        gap: 2rem;
    }
    .about-content-item {
        padding: 1.8rem;
    }
}