:root {
    --bg-main: #FAFBFF;
    --bg-white: #FFFFFF;
    --brand-green: #00D26A;
    --brand-green-dark: #00A34B;
    --ai-purple: #7B61FF;
    --ai-gradient: linear-gradient(135deg, #00D26A 0%, #7B61FF 100%);
    --text-dark: #0F141E;
    --text-body: #4A5568;
    --text-muted: #A0AEC0;
    --border-soft: #E2E8F0;
    --shadow-soft: 0 20px 40px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 30px 60px rgba(0, 210, 106, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: var(--bg-main); color: var(--text-body); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* 导航 */
.header { background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border-soft); position: sticky; top: 0; z-index: 1000; }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 80px; padding: 0 20px; }
.logo { font-size: 24px; font-weight: 800; color: var(--text-dark); display: flex; align-items: center; gap: 12px; }
.logo img { width: 36px; height: 36px; border-radius: 8px; }
.nav-links { display: flex; gap: 35px; align-items: center; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--text-dark); position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--brand-green); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 16px 36px; border-radius: 50px; font-size: 16px; font-weight: 700; cursor: pointer; transition: 0.3s; border: 2px solid transparent; }
.btn-primary { background: var(--brand-green); color: #FFF; box-shadow: 0 10px 20px rgba(0, 210, 106, 0.2); }
.btn-primary:hover { background: var(--brand-green-dark); transform: translateY(-3px); box-shadow: 0 15px 30px rgba(0, 210, 106, 0.3); }
.btn-outline { background: var(--bg-white); color: var(--text-dark); border: 2px solid var(--border-soft); }
.btn-outline:hover { border-color: var(--text-dark); background: var(--text-dark); color: #FFF; }

/* 全局容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 100px 20px; }
.sec-title { text-align: center; font-size: 40px; font-weight: 800; color: var(--text-dark); margin-bottom: 20px; letter-spacing: -0.5px; }
.sec-subtitle { text-align: center; font-size: 18px; color: var(--text-muted); margin-bottom: 60px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* Hero区：品牌焕新 */
.hero { text-align: center; padding: 100px 20px 80px; position: relative; overflow: hidden; }
/* 背景炫光装饰 */
.hero::before { content: ''; position: absolute; top: -20%; left: -10%; width: 500px; height: 500px; background: radial-gradient(circle, rgba(0,210,106,0.1) 0%, transparent 70%); z-index: -1; }
.hero::after { content: ''; position: absolute; top: -10%; right: -10%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(123,97,255,0.08) 0%, transparent 70%); z-index: -1; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: var(--bg-white); border: 1px solid var(--border-soft); padding: 8px 20px; border-radius: 30px; font-size: 14px; font-weight: 700; color: var(--text-dark); margin-bottom: 30px; box-shadow: var(--shadow-soft); }
.hero-badge span { background: var(--ai-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero h1 { font-size: 64px; font-weight: 900; color: var(--text-dark); margin-bottom: 20px; line-height: 1.15; letter-spacing: -1px; }
.hero .subtitle { font-size: 24px; color: var(--text-body); margin-bottom: 40px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.hero-visual { max-width: 1000px; margin: 0 auto; position: relative; }
.hero-visual img { border-radius: 16px; box-shadow: var(--shadow-hover); border: 1px solid var(--border-soft); }

/* 核心卖点升级 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { background: var(--bg-white); border-radius: 20px; padding: 40px 20px; text-align: center; box-shadow: var(--shadow-soft); transition: 0.3s; border: 1px solid var(--border-soft); }
.f-box:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: var(--brand-green); }
.f-box img { width: 64px; height: 64px; margin: 0 auto 20px; }
.f-box h3 { font-size: 18px; font-weight: 800; color: var(--text-dark); margin-bottom: 12px; }
.f-box p { font-size: 14px; color: var(--text-body); line-height: 1.5; }

/* 详情：焕新视觉与AI */
.detail-sec { padding: 40px 0; }
.detail-item { display: flex; align-items: center; gap: 80px; margin-bottom: 100px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-tag { display: inline-block; padding: 6px 14px; background: rgba(123, 97, 255, 0.1); color: var(--ai-purple); font-size: 12px; font-weight: 800; border-radius: 8px; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.d-text h3 { font-size: 36px; font-weight: 800; color: var(--text-dark); margin-bottom: 24px; line-height: 1.3; }
.d-text p { font-size: 18px; color: var(--text-body); line-height: 1.7; margin-bottom: 30px; }
.d-data-wrap { display: flex; gap: 40px; }
.d-data-box h4 { font-size: 32px; font-weight: 900; color: var(--brand-green); margin-bottom: 4px; }
.d-data-box p { font-size: 14px; color: var(--text-muted); font-weight: 600; }
.d-visual { flex: 1.2; position: relative; }
.d-visual img { border-radius: 16px; box-shadow: var(--shadow-soft); }
/* 装饰渐变光晕 */
.d-visual::after { content: ''; position: absolute; top: 10%; right: -10%; width: 80%; height: 80%; background: var(--brand-green); opacity: 0.1; filter: blur(40px); z-index: -1; border-radius: 50%; }

/* 对比：优势重塑 */
.compare-box { background: var(--bg-white); border-radius: 24px; padding: 20px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-soft); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 24px 30px; border-bottom: 1px solid var(--border-soft); }
.compare-table th { font-weight: 700; color: var(--text-muted); font-size: 15px; }
.compare-table td { font-size: 16px; color: var(--text-dark); font-weight: 500; }
.compare-table .hl { background: rgba(0, 210, 106, 0.05); color: var(--brand-green-dark); font-weight: 800; border-radius: 8px; }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据：信任基石 */
.data-sec { background: var(--text-dark); padding: 100px 0; margin: 80px 0; }
.data-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-around; text-align: center; }
.data-item h4 { font-size: 56px; font-weight: 900; color: #FFF; margin-bottom: 12px; }
.data-item p { font-size: 16px; color: var(--brand-green); font-weight: 600; letter-spacing: 1px; }

/* 下载：版本选择 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card { background: var(--bg-white); padding: 50px 30px; border-radius: 24px; text-align: center; border: 1px solid var(--border-soft); transition: 0.3s; position: relative; }
.dl-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-hover); border-color: var(--brand-green); }
.dl-card.pro { border: 2px solid var(--brand-green); }
.dl-card.pro::before { content: "AI 焕新主推"; position: absolute; top: -16px; left: 50%; transform: translateX(-50%); background: var(--brand-green); color: #FFF; padding: 6px 20px; border-radius: 20px; font-size: 13px; font-weight: 700; box-shadow: 0 4px 10px rgba(0,210,106,0.3); }
.dl-card h3 { font-size: 24px; font-weight: 800; color: var(--text-dark); margin-bottom: 16px; }
.dl-card p { font-size: 15px; color: var(--text-body); margin-bottom: 40px; height: 50px; }
.dl-card .btn { width: 100%; }

/* FAQ */
.faq-grid { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.faq-item { background: var(--bg-white); border: 1px solid var(--border-soft); border-radius: 16px; padding: 30px 40px; transition: 0.3s; }
.faq-item:hover { box-shadow: var(--shadow-soft); }
.faq-item h4 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; display: flex; align-items: center; gap: 12px; }
.faq-item h4::before { content: ""; width: 8px; height: 8px; background: var(--brand-green); border-radius: 50%; display: inline-block; }
.faq-item p { font-size: 15px; color: var(--text-body); line-height: 1.7; padding-left: 20px; }

/* Footer */
.footer { background: var(--bg-white); border-top: 1px solid var(--border-soft); padding: 50px 20px; text-align: center; color: var(--text-muted); font-size: 14px; font-weight: 500; }