/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.2;
    color: #1d1d1f;
    background-color: #ffffff;
    height: 100vh;
    display: flex;
    align-items: center;
}

/* 容器样式 */
.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100vh;
}

/* 头部样式 */
header {
    text-align: center;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 20px 0;
}

h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 10px;
    background: linear-gradient(120deg, #0071e3, #00a0ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 20px;
    color: #6e6e73;
    max-width: 600px;
    margin: 0 auto;
}

/* 主要内容样式 */
.main-content {
    flex: 2;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    gap: 30px;
    align-items: center;
    padding: 20px 0;
}

.section {
    width: 100%;
    max-width: 800px;
    text-align: center;
    margin: 10px 0;
}

h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #1d1d1f;
}

/* 功能特点样式 */
.features {
    background: #f5f5f7;
    border-radius: 16px;
    padding: 25px;
    margin: 10px 0;
}

.features ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    text-align: left;
}

.features li {
    position: relative;
    padding-left: 20px;
    font-size: 14px;
    color: #1d1d1f;
}

.features li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #0071e3;
    font-size: 16px;
}

/* 下载按钮样式 */
.download {
    margin: 30px 0;
}

.download-button {
    display: inline-block;
    background-color: #0071e3;
    color: #ffffff;
    padding: 12px 28px;
    border-radius: 980px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.download-button:hover {
    background-color: #0077ed;
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.15);
}

.version-info {
    margin-top: 8px;
    color: #6e6e73;
    font-size: 12px;
}

/* 使用说明样式 */
.usage {
    background: #fff;
    border: 1px solid #e5e5e7;
    border-radius: 16px;
    padding: 25px;
    margin: 10px 0;
}

.usage ol {
    list-style: none;
    counter-reset: step-counter;
    text-align: left;
    max-width: 500px;
    margin: 0 auto;
}

.usage li {
    counter-increment: step-counter;
    margin-bottom: 8px;
    font-size: 14px;
    padding-left: 24px;
    position: relative;
}

.usage li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    color: #0071e3;
    font-weight: 600;
}

/* 页脚样式 */
footer {
    text-align: center;
    color: #6e6e73;
    font-size: 12px;
    padding-top: 15px;
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    h1 {
        font-size: 36px;
    }

    .subtitle {
        font-size: 18px;
    }

    h2 {
        font-size: 20px;
    }

    .features ul {
        grid-template-columns: 1fr;
    }

    .features, .usage {
        padding: 15px;
    }

    .download-button {
        padding: 10px 24px;
        font-size: 16px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.2s ease-out forwards;
}