:root {
    --primary: #0078d7; /* Windows系统蓝 */
    --primary-hover: #005a9e;
    --success: #107c10;
    --bg-dark: #e5e5e5; /* 模拟桌面背景色 */
    --bg-window: #ffffff;
    --text-main: #000000;
    --text-muted: #666666;
    --border-color: #cccccc;
    --shadow-window: 0 4px 20px rgba(0,0,0,0.2), 0 0 1px rgba(0,0,0,0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-dark); background-image: radial-gradient(#d4d4d4 1px, transparent 1px); background-size: 20px 20px;
    color: var(--text-main); line-height: 1.5;
}
a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* 模拟系统窗口的导航栏 */
header {
    background: #f3f3f3; border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 100; box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.logo { font-size: 20px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.logo-icon { width: 24px; height: 24px; background: var(--primary); border-radius: 4px; display: inline-block; }
.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-main); padding: 5px 10px; border-radius: 4px; }
.nav-links a:hover, .nav-links a.active { background: #e0e0e0; }

/* 按钮风格 (模拟系统按钮) */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 8px 30px; border-radius: 2px; font-weight: 600; font-size: 14px;
    cursor: pointer; border: 1px solid transparent; transition: 0.2s; min-width: 120px;
}
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary-hover); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { background: #e1e1e1; color: #000; border-color: #adadad; }
.btn-outline:hover { background: #e5f1fb; border-color: #0078d7; }

/* Hero弹窗区 */
.hero { padding: 60px 0 80px; display: flex; justify-content: center; }
.dl-window {
    background: var(--bg-window); width: 100%; max-width: 700px;
    border-radius: 6px; box-shadow: var(--shadow-window); border: 1px solid #999;
    overflow: hidden; animation: popIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes popIn { 0% { transform: scale(0.9); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }

.win-header { background: #fff; padding: 10px 15px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #f0f0f0; }
.win-title { font-size: 12px; color: #333; display: flex; align-items: center; gap: 6px; }
.win-title-icon { width: 16px; height: 16px; background: var(--primary); display: inline-block; }
.win-controls { display: flex; gap: 2px; }
.win-btn { width: 46px; height: 30px; display: flex; align-items: center; justify-content: center; font-size: 14px; color: #000; }
.win-btn:hover { background: #e5e5e5; }
.win-btn.close:hover { background: #e81123; color: #fff; }

.win-body { padding: 30px; text-align: center; }
.win-body h1 { font-size: 28px; font-weight: normal; margin-bottom: 10px; color: var(--primary); }
.win-body p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; }

/* 进度条模拟 */
.progress-container { margin-bottom: 30px; text-align: left; }
.progress-status { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 8px; color: #333; }
.progress-bar-bg { width: 100%; height: 22px; background: #e6e6e6; border: 1px solid #ccc; position: relative; }
.progress-bar-fill { height: 100%; background: var(--success); width: 85%; position: relative; overflow: hidden; }
.progress-bar-fill::after { content: ''; position: absolute; top: 0; left: 0; bottom: 0; right: 0; background: linear-gradient( -45deg, rgba(255, 255, 255, 0.2) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.2) 50%, rgba(255, 255, 255, 0.2) 75%, transparent 75%, transparent ); background-size: 20px 20px; animation: progressAnim 1s linear infinite; }
@keyframes progressAnim { 0% { background-position: 0 0; } 100% { background-position: 20px 0; } }

.win-footer { background: #f0f0f0; padding: 15px 30px; display: flex; justify-content: flex-end; gap: 10px; border-top: 1px solid #dfdfdf; }
.hero-img-show { padding: 20px; text-align: center; background: #fafafa; border-top: 1px solid #eee; }
.hero-img-show img { border: 1px solid #ccc; border-radius: 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); margin: 0 auto; max-width: 80%; }

/* 模块通用 */
section { padding: 60px 0; }
.sec-title { font-size: 24px; font-weight: normal; margin-bottom: 30px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); display: inline-block; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 15px; }
.f-box { background: #fff; border: 1px solid #dcdcdc; padding: 20px 15px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.f-box:hover { border-color: var(--primary); }
.f-box img { width: 40px; height: 40px; margin: 0 auto 10px; }
.f-box h3 { font-size: 15px; font-weight: 600; margin-bottom: 5px; color: var(--primary); }
.f-box p { font-size: 12px; color: var(--text-muted); }

/* 详情 (带官方推荐感) */
.detail-item { display: flex; align-items: flex-start; gap: 40px; margin-bottom: 50px; background: #fff; padding: 30px; border: 1px solid #ccc; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.d-text { flex: 1; }
.d-text h3 { font-size: 20px; font-weight: 600; margin-bottom: 15px; color: #000; }
.d-text p { font-size: 14px; color: #333; line-height: 1.8; margin-bottom: 15px; }
.official-tag { display: inline-block; background: #fff4ce; color: #d83b01; border: 1px solid #f2c811; padding: 2px 8px; font-size: 12px; font-weight: bold; }
.d-img { width: 350px; border: 1px solid #ccc; background: #f9f9f9; padding: 5px; }

/* 对比 */
.compare-box { background: #fff; border: 1px solid #ccc; }
.compare-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.compare-table th, .compare-table td { padding: 15px; border-bottom: 1px solid #eee; text-align: left; }
.compare-table th { background: #f5f5f5; font-weight: 600; border-bottom: 1px solid #ccc; }
.compare-table .hl { color: var(--success); font-weight: bold; background: #f4fbf4; }
.compare-table td i { color: var(--success); font-weight: bold; margin-right: 5px; }

/* 下载版本 */
.v-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.v-card { background: #fff; border: 1px solid #ccc; padding: 30px 20px; text-align: center; transition: 0.2s; }
.v-card:hover { border-color: var(--primary); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.v-card.rec { border: 2px solid var(--primary); position: relative; }
.v-card.rec::after { content: '官方推荐安装'; position: absolute; top: 0; left: 0; width: 100%; background: var(--primary); color: #fff; font-size: 12px; padding: 3px 0; font-weight: bold; }
.v-card h3 { font-size: 18px; margin-top: 15px; margin-bottom: 10px; color: #000; }
.v-card p { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; height: 38px; }

/* 数据展示 */
.data-sec { background: #fff; border: 1px solid #ccc; padding: 40px 0; }
.data-flex { display: flex; justify-content: space-around; text-align: center; }
.data-item h4 { font-size: 36px; font-weight: normal; color: var(--primary); margin-bottom: 5px; }
.data-item p { font-size: 14px; color: #333; font-weight: 600; }

/* FAQ */
.faq-list { background: #fff; border: 1px solid #ccc; }
.faq-item { padding: 20px; border-bottom: 1px solid #eee; }
.faq-item:last-child { border-bottom: none; }
.faq-item h4 { font-size: 15px; font-weight: 600; color: #000; margin-bottom: 10px; }
.faq-item p { font-size: 14px; color: #555; }

footer { background: #fff; border-top: 1px solid #ccc; padding: 20px 0; text-align: center; font-size: 12px; color: #999; }