:root {
    --bg-white: #FFFFFF;
    --bg-gray: #F5F7FA;
    --bg-dark: #1F2937;
    --primary-blue: #2563EB;
    --primary-hover: #1D4ED8;
    --text-dark: #111827;
    --text-body: #4B5563;
    --text-muted: #9CA3AF;
    --border-color: #E5E7EB;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--bg-white); color: var(--text-body); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.2s ease; }
img { max-width: 100%; display: block; border-radius: 8px; }
ul { list-style: none; }

/* 导航 */
.header { background: var(--bg-white); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; box-shadow: var(--shadow-sm); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 72px; padding: 0 24px; }
.logo { font-size: 20px; font-weight: 700; color: var(--text-dark); display: flex; align-items: center; gap: 10px; }
.logo img { width: 32px; height: 32px; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--text-body); }
.nav-links a:hover, .nav-links a.active { color: var(--primary-blue); }
.nav-cta { background: var(--primary-blue); color: #FFF !important; padding: 8px 20px; border-radius: 6px; font-weight: 600 !important; }
.nav-cta:hover { background: var(--primary-hover); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 6px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.2s; }
.btn-primary { background: var(--primary-blue); color: #FFF; box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4); }
.btn-outline { background: var(--bg-white); color: var(--primary-blue); border: 1px solid var(--primary-blue); }
.btn-outline:hover { background: #EFF6FF; }

/* 通用布局 */
.container { max-width: 1200px; margin: 0 auto; padding: 80px 24px; }
.sec-header { text-align: center; max-width: 700px; margin: 0 auto 60px; }
.sec-title { font-size: 36px; font-weight: 800; color: var(--text-dark); margin-bottom: 16px; }
.sec-desc { font-size: 18px; color: var(--text-body); }

/* Hero CTA 区域 */
.hero { padding: 100px 24px 60px; text-align: center; background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%); border-bottom: 1px solid var(--border-color); }
.hero-content { max-width: 800px; margin: 0 auto; }
.hero h1 { font-size: 52px; font-weight: 800; color: var(--text-dark); margin-bottom: 24px; line-height: 1.2; letter-spacing: -0.5px; }
.hero .subtitle { font-size: 22px; color: var(--text-body); margin-bottom: 40px; font-weight: 400; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.hero-visual { max-width: 1000px; margin: 0 auto; border-radius: 12px; box-shadow: var(--shadow-lg); overflow: hidden; border: 1px solid var(--border-color); }

/* 核心卖点 Grid */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-card { text-align: center; padding: 32px 20px; background: var(--bg-white); border-radius: 12px; border: 1px solid var(--border-color); transition: 0.3s; }
.f-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--primary-blue); }
.f-card img { width: 48px; height: 48px; margin: 0 auto 20px; }
.f-card h3 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.f-card p { font-size: 14px; color: var(--text-body); line-height: 1.5; }

/* 左右功能详述 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-box:last-child { margin-bottom: 0; }
.detail-box:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-tag { display: inline-block; font-size: 12px; font-weight: 700; color: var(--primary-blue); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }
.d-text h3 { font-size: 30px; font-weight: 700; color: var(--text-dark); margin-bottom: 20px; line-height: 1.3; }
.d-text p { font-size: 16px; color: var(--text-body); margin-bottom: 24px; line-height: 1.7; }
.d-data-box { background: var(--bg-gray); padding: 16px 24px; border-left: 4px solid var(--primary-blue); border-radius: 4px; }
.d-data-box strong { display: block; font-size: 24px; color: var(--text-dark); margin-bottom: 4px; }
.d-data-box span { font-size: 14px; color: var(--text-body); }
.d-visual { flex: 1; }
.d-visual img { box-shadow: var(--shadow-md); border: 1px solid var(--border-color); }

/* 数据展示 */
.data-sec { background: var(--bg-dark); color: #FFF; padding: 80px 0; text-align: center; }
.data-grid { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; }
.data-item h4 { font-size: 48px; font-weight: 800; color: var(--primary-blue); margin-bottom: 8px; }
.data-item p { font-size: 16px; color: #D1D5DB; font-weight: 500; }

/* 表格对比 */
.compare-table-wrapper { background: var(--bg-white); border-radius: 12px; border: 1px solid var(--border-color); overflow: hidden; box-shadow: var(--shadow-sm); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--border-color); }
.compare-table th { background: var(--bg-gray); font-weight: 600; color: var(--text-dark); font-size: 15px; }
.compare-table td { font-size: 15px; color: var(--text-body); }
.compare-table .hl { background: #EFF6FF; color: var(--primary-blue); font-weight: 600; border-left: 2px solid var(--primary-blue); }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载卡片 Grid */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.dl-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 12px; padding: 40px 30px; text-align: center; transition: 0.3s; display: flex; flex-direction: column; }
.dl-card:hover { border-color: var(--primary-blue); box-shadow: var(--shadow-md); }
.dl-card.pro { border: 2px solid var(--primary-blue); position: relative; }
.dl-card.pro::before { content: "推荐版本"; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary-blue); color: #FFF; padding: 4px 12px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.dl-card h3 { font-size: 24px; font-weight: 700; color: var(--text-dark); margin-bottom: 16px; }
.dl-card p { font-size: 15px; color: var(--text-body); margin-bottom: 32px; flex-grow: 1; }
.dl-card .btn { width: 100%; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; max-width: 1000px; margin: 0 auto; }
.faq-item { background: var(--bg-gray); padding: 32px; border-radius: 8px; }
.faq-item h4 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.faq-item p { font-size: 15px; color: var(--text-body); line-height: 1.6; }

/* Footer */
.footer { background: var(--bg-white); border-top: 1px solid var(--border-color); padding: 40px 24px; text-align: center; color: var(--text-muted); font-size: 14px; }