:root {
    --win-blue: #0078D4; /* Windows 主题蓝 */
    --win-blue-hover: #006CBD;
    --win-bg: #f3f3f3;
    --taskbar-bg: rgba(238, 243, 250, 0.85);
    --window-bg: rgba(255, 255, 255, 0.95);
    --text-main: #000000;
    --text-muted: #5c5c5c;
    --border: rgba(0, 0, 0, 0.1);
    --shadow-window: 0 8px 32px rgba(0,0,0,0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
    color: var(--text-main); 
    /* 模拟经典 Windows 桌面壁纸风格背景 */
    background: radial-gradient(circle at top right, #e1f5fe, #bfdbfe, #93c5fd);
    background-attachment: fixed;
    line-height: 1.6;
    padding-bottom: 50px; /* 留出任务栏空间 */
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; border-radius: 4px; }

/* 模拟桌面快捷方式 */
.desktop-shortcuts {
    position: fixed; top: 20px; left: 20px;
    display: flex; flex-direction: column; gap: 20px; z-index: 10;
}
.shortcut {
    display: flex; flex-direction: column; align-items: center; gap: 5px;
    width: 70px; padding: 5px; border-radius: 4px; cursor: pointer; transition: 0.2s; text-align: center;
}
.shortcut:hover { background: rgba(255,255,255,0.3); }
.shortcut img { width: 40px; height: 40px; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2)); }
.shortcut span { font-size: 12px; color: #0f172a; text-shadow: 0 1px 2px rgba(255,255,255,0.8); font-weight: 500; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 20; }

/* 导航窗体 (模拟应用头部) */
header {
    margin: 20px auto 0; max-width: 1100px;
    background: var(--window-bg); backdrop-filter: blur(10px);
    border: 1px solid var(--border); border-radius: 8px 8px 0 0;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.win-titlebar {
    height: 32px; display: flex; justify-content: space-between; align-items: center;
    padding: 0 15px; border-bottom: 1px solid var(--border); font-size: 12px;
}
.win-titlebar-title { display: flex; align-items: center; gap: 8px; color: var(--text-muted); }
.win-titlebar-title img { width: 14px; height: 14px; }
.win-controls { display: flex; gap: 10px; color: var(--text-muted); font-size: 10px; }
.win-controls span { cursor: pointer; }
.win-controls span:hover { color: #000; }

.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 60px; padding: 0 20px; }
.logo { font-size: 22px; font-weight: 700; color: var(--text-main); }
.logo span { color: var(--win-blue); }
.nav-links { display: flex; gap: 20px; }
.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: rgba(0,0,0,0.05); }

/* 按钮风格 (Windows原生感) */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 24px; border-radius: 4px; font-weight: 600; font-size: 15px;
    cursor: pointer; border: 1px solid transparent; transition: 0.2s;
}
.btn-primary { background: var(--win-blue); color: #fff; box-shadow: 0 2px 4px rgba(0,120,212,0.3); border-color: var(--win-blue-hover); }
.btn-primary:hover { background: var(--win-blue-hover); transform: translateY(-1px); }
.btn-outline { background: #fdfdfd; color: var(--text-main); border: 1px solid #cccccc; }
.btn-outline:hover { background: #f3f3f3; border-color: #999; }

/* 页面内容承载区 (模拟窗口主体) */
.app-body {
    max-width: 1100px; margin: 0 auto 40px;
    background: var(--window-bg); backdrop-filter: blur(20px);
    border: 1px solid var(--border); border-top: none;
    border-radius: 0 0 8px 8px; box-shadow: var(--shadow-window);
}

/* Hero区 */
.hero { padding: 60px 40px; display: flex; align-items: center; gap: 40px; border-bottom: 1px solid var(--border); }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 46px; font-weight: 800; line-height: 1.2; margin-bottom: 15px; color: var(--text-main); }
.hero-text p { font-size: 18px; color: var(--text-muted); margin-bottom: 30px; }
.hero-btns { display: flex; gap: 15px; }
.hero-img { flex: 1; padding: 10px; background: #fff; border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); }

/* 模块通用 */
section { padding: 60px 40px; border-bottom: 1px solid var(--border); }
section:last-child { border-bottom: none; }
.sec-title { font-size: 28px; font-weight: 700; margin-bottom: 40px; color: var(--text-main); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 15px; }
.f-card { background: #fff; border: 1px solid var(--border); padding: 25px 15px; text-align: center; border-radius: 6px; transition: 0.2s; }
.f-card:hover { border-color: var(--win-blue); box-shadow: 0 4px 10px rgba(0,0,0,0.05); transform: translateY(-2px); }
.f-card img { width: 40px; height: 40px; margin: 0 auto 15px; }
.f-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 5px; color: var(--text-main); }
.f-card p { font-size: 12px; color: var(--text-muted); }

/* 详情 (设置面板风) */
.detail-list { display: flex; flex-direction: column; gap: 40px; }
.detail-item { display: flex; gap: 40px; align-items: flex-start; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 22px; font-weight: 600; margin-bottom: 15px; color: var(--text-main); }
.d-text p { font-size: 14px; color: var(--text-muted); margin-bottom: 15px; line-height: 1.7; }
.d-tag { display: inline-block; background: #e0f2fe; color: var(--win-blue); padding: 4px 10px; border-radius: 4px; font-size: 12px; font-weight: bold; }
.d-img { flex: 1; background: #fff; padding: 5px; border: 1px solid var(--border); border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }

/* 对比表格 (任务管理器风) */
.compare-box { background: #fff; border: 1px solid var(--border); border-radius: 6px; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 14px; }
.compare-table th, .compare-table td { padding: 15px 20px; border-bottom: 1px solid var(--border); }
.compare-table th { background: #f8f9fa; font-weight: 600; color: var(--text-muted); border-bottom: 2px solid var(--border); }
.compare-table .hl { color: var(--win-blue); font-weight: 700; background: #f0f8ff; }

/* 版本下载 */
.v-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.v-card { background: #fff; border: 1px solid var(--border); padding: 30px; text-align: center; border-radius: 6px; transition: 0.2s; }
.v-card:hover { border-color: var(--win-blue); }
.v-card.rec { border: 2px solid var(--win-blue); box-shadow: 0 4px 12px rgba(0,120,212,0.1); }
.v-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.v-card p { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; height: 40px; }

/* 数据展示 */
.data-sec { background: var(--win-blue); color: #fff; padding: 40px; border-radius: 8px; margin-bottom: 40px; }
.data-flex { display: flex; justify-content: space-around; text-align: center; }
.data-item h4 { font-size: 36px; font-weight: 700; margin-bottom: 5px; }
.data-item p { font-size: 14px; opacity: 0.9; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: 1fr; gap: 15px; }
.faq-box { background: #fff; border: 1px solid var(--border); padding: 20px; border-radius: 4px; }
.faq-box h4 { font-size: 15px; font-weight: 600; margin-bottom: 8px; color: var(--win-blue); }
.faq-box p { font-size: 14px; color: var(--text-muted); }

/* 模拟 Windows 任务栏 */
.taskbar {
    position: fixed; bottom: 0; left: 0; width: 100%; height: 48px;
    background: var(--taskbar-bg); backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255,255,255,0.4);
    display: flex; justify-content: center; align-items: center; z-index: 1000;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}
.task-icons { display: flex; gap: 8px; align-items: center; }
.task-icon { width: 40px; height: 40px; border-radius: 4px; display: flex; justify-content: center; align-items: center; transition: 0.2s; cursor: pointer; position: relative; }
.task-icon:hover { background: rgba(255,255,255,0.6); }
.task-icon.active { background: rgba(255,255,255,0.8); }
.task-icon.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 16px; height: 3px; background: var(--win-blue); border-radius: 2px; }
.task-icon img { width: 24px; height: 24px; }
.taskbar-right { position: absolute; right: 20px; display: flex; align-items: center; gap: 15px; font-size: 12px; color: #333; font-weight: 500; }

footer { text-align: center; padding: 20px 0; color: var(--text-muted); font-size: 12px; }