body {
    margin: 0;
    padding: 0;
}

:root {
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}



/*Top*/
#top {
    background-color: black;
    width: 100%;
    height: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: 160px;
    padding-bottom: 160px;
    font-family: var(--main-font-family);
    color: white;
}


#top h1 {
    margin: 0;
    padding: 0;
    font-size: 80px;
    font-weight: 500;
}

#top h5 {
    margin-top: 20px;
    font-size: 15px;
    padding: 0;
    font-weight: 200;
}


@media screen and (max-width: 1536px) {
    #top h1 {
        font-size: 50px;
    }
}


@media screen and (max-width: 768px) {
    #top h1 {
        font-size: 30px;
    }
}

#start-button {
    background-color: white;
    /* 白色背景 */
    color: black;
    /* 黑色文字 */
    border: none;
    /* 无边框 */
    border-radius: 25px;
    /* 圆角 */
    padding: 14px 36px;
    /* 内边距 */
    font-size: 16px;
    /* 字体大小 */
    font-weight: 400;
    /* 字体粗细 */
    cursor: pointer;
    /* 鼠标悬停时显示手型光标 */
    margin-top: 10px;
    /* 与上方元素的间距 */
    transition: all 0.3s ease;
    /* 添加过渡效果 */
    animation: slideInLeft 0.8s ease-out 0.6s;
    /* 延迟0.6秒 */
    animation-fill-mode: backwards;
}

#start-button:hover {
    background-color: #f0f0f0;
    /* 悬停时稍微变暗 */
    transform: scale(1.05);
    /* 悬停时轻微放大 */
}




#top>div {
    animation: slideInLeft 1s ease-out;
}

#top h1:first-child {
    animation: slideInLeft 0.8s ease-out;
}

#top h1:last-child {
    animation: slideInLeft 0.8s ease-out 0.2s;
    /* 延迟0.2秒 */
    animation-fill-mode: backwards;
}

#top h5 {
    margin-top: 20px;
    font-size: 15px;
    padding: 0;
    font-weight: 200;
    animation: slideInLeft 0.8s ease-out 0.4s;
    /* 延迟0.4秒 */
    animation-fill-mode: backwards;
}


@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-80px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* info */

#info {
    padding-top: 120px;
    padding-bottom: 120px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f5f7fc;
    font-family: var(--main-font-family);
}

#info>div {
    width: 60%;
}

#info h2 {
    width: 80%;
    padding: 0;
    margin: 0;
    font-size: 60px;
    font-weight: 700;
}



.three-columns {
    display: grid;
    margin-top: 50px;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto auto;
}

.column {
    margin-top: 20px;
    flex: 1;
}

.column h3 {
    color: #333;
    font-size: 18px;
}

.column p {
    width: 90%;
    color: #666;
    font-size: 15px;
    line-height: 1.5;
}

.feature-image {
    width: 64px;
    height: 64px;
    margin-bottom: 15px;
}



@media screen and (max-width: 1536px) {
    #info h2 {
        font-size: 45px;
    }

    .feature-image {
        width: 50px;
        height: 50px;
        margin-bottom: 15px;
    }

    .three-columns {
        grid-template-columns: repeat(2, 1fr);
    }
}


@media screen and (max-width: 768px) {
    #info h2 {
        font-size: 30px;
    }

    .feature-image {
        width: 34px;
        height: 34px;
        margin-bottom: 15px;
    }

    .three-columns {
        grid-template-columns: repeat(1, 1fr);
    }
}


/* info 区域动画 */
#info>div {
    animation: scaleIn 0.6s cubic-bezier(0.34, 1.2, 0.64, 1) 0.3s forwards;
    opacity: 0;
    transform: scale(0.85);
}

/* 卡片动画 */
.column {
    opacity: 0;
    transform: scale(0.85);
    animation: cardScaleIn 0.4s cubic-bezier(0.34, 1.2, 0.64, 1) forwards;
}

.column:nth-child(1) {
    animation-delay: 0.6s;
}

.column:nth-child(2) {
    animation-delay: 0.8s;
}

.column:nth-child(3) {
    animation-delay: 1.0s;
}

.column:nth-child(4) {
    animation-delay: 0.6s;
}

.column:nth-child(5) {
    animation-delay: 0.8s;
}

.column:nth-child(6) {
    animation-delay: 1.0s;
}

@keyframes scaleIn {
    0% {
        opacity: 0;
        transform: scale(0.85);
    }

    50% {
        opacity: 1;
        transform: scale(1.03);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes cardScaleIn {
    0% {
        opacity: 0;
        transform: scale(0.85);
    }

    60% {
        opacity: 1;
        transform: scale(1.02);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* 页脚样式 */
#footer {
    background-color: black;
    color: white;
    padding: 140px 0 20px 0;
    font-family: var(--main-font-family);
}

#footer>div {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    width: 80%;
    max-width: 1200px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin: 0 0 15px 0;
    font-size: 24px;
    font-weight: 600;
}

.footer-section h4 {
    margin: 0 0 15px 0;
    font-size: 18px;
    font-weight: 500;
}

.footer-section p {
    margin: 8px 0;
    font-size: 14px;
    color: #ccc;
}

.footer-bottom {
    width: 80%;
    max-width: 1200px;
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    font-size: 12px;
    color: #999;
}

/* 响应式页脚 */
@media screen and (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        align-items: center;
        gap: 30px;
        width: 90%;
    }

    .footer-section {
        text-align: center;
    }
}

/* 页脚链接样式 */
.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
    text-decoration: underline;
}