:root {
    --poster-bg: #090E17; /* 暗黑背景 */
    --poster-card: #121A26;
    --shield-green: #00E676; /* 防护绿 */
    --shield-gold: #FFC107; /* 警示金 */
    --text-light: #F8FAFC;
    --text-muted: #94A3B8;
    --border-dark: #1E293B;
    --glow-green: 0 0 25px rgba(0, 230, 118, 0.4);
    --glow-gold: 0 0 25px rgba(255, 193, 7, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background-color: var(--poster-bg); color: var(--text-light); line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 8px; }
ul { list-style: none; }

/* 导航 */
.header { background: rgba(9, 14, 23, 0.9); border-bottom: 1px solid var(--border-dark); position: sticky; top: 0; z-index: 1000; backdrop-filter: blur(10px); }
.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: 900; color: var(--text-light); display: flex; align-items: center; gap: 12px; letter-spacing: 1px; }
.logo img { width: 36px; height: 36px; filter: drop-shadow(0 0 5px var(--shield-green)); }
.logo span { color: var(--shield-green); }
.nav-links { display: flex; gap: 40px; }
.nav-links a { font-size: 16px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; }
.nav-links a:hover, .nav-links a.active { color: var(--shield-green); text-shadow: 0 0 10px var(--shield-green); }

.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; }

/* 海报风按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 16px 40px; border-radius: 4px; font-size: 18px; font-weight: 900; cursor: pointer; transition: 0.3s; text-transform: uppercase; letter-spacing: 2px; }
.btn-primary { background: var(--shield-green); color: #000; box-shadow: var(--glow-green); border: 2px solid var(--shield-green); }
.btn-primary:hover { background: transparent; color: var(--shield-green); box-shadow: inset 0 0 15px rgba(0, 230, 118, 0.5), var(--glow-green); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--shield-gold); border: 2px solid var(--shield-gold); box-shadow: 0 0 15px rgba(255,193,7,0.1); }
.btn-outline:hover { background: var(--shield-gold); color: #000; box-shadow: var(--glow-gold); transform: translateY(-2px); }

/* 首屏 海报区 */
.hero { display: flex; align-items: center; gap: 60px; padding: 100px 20px 120px; max-width: 1200px; margin: 0 auto; position: relative; }
.hero::before { content: 'SECURE'; position: absolute; top: 10%; left: -5%; font-size: 180px; font-weight: 900; color: rgba(255,255,255,0.02); z-index: -1; transform: rotate(-10deg); }
.hero-content { flex: 1.2; position: relative; z-index: 2; }
.badge-safe { display: inline-block; padding: 6px 16px; background: rgba(0,230,118,0.1); border: 1px solid var(--shield-green); color: var(--shield-green); font-weight: 800; font-size: 14px; letter-spacing: 2px; margin-bottom: 20px; border-radius: 2px; }
.hero-content h1 { font-size: 64px; font-weight: 900; line-height: 1.1; margin-bottom: 20px; color: var(--text-light); text-transform: uppercase; }
.hero-content .subtitle { font-size: 28px; color: var(--shield-gold); margin-bottom: 30px; font-weight: 700; text-shadow: var(--glow-gold); }
.hero-content .desc { font-size: 16px; color: var(--text-muted); margin-bottom: 50px; line-height: 1.8; max-width: 500px; border-left: 4px solid var(--shield-green); padding-left: 15px; }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1; position: relative; }
.hero-visual img { border-radius: 4px; border: 2px solid var(--border-dark); box-shadow: 20px 20px 0 rgba(0, 230, 118, 0.2); transition: 0.5s; }
.hero-visual:hover img { transform: translate(-5px, -5px); box-shadow: 25px 25px 0 var(--shield-green); }

/* 模块标题 (海报字体) */
.sec-title { text-align: center; font-size: 42px; font-weight: 900; margin-bottom: 60px; color: var(--text-light); letter-spacing: 3px; text-transform: uppercase; display: flex; flex-direction: column; align-items: center; }
.sec-title::after { content: ''; width: 80px; height: 6px; background: var(--shield-green); margin-top: 15px; box-shadow: var(--glow-green); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--poster-card); border: 1px solid var(--border-dark); padding: 40px 20px; text-align: center; border-radius: 4px; transition: 0.3s; position: relative; }
.f-box:hover { border-color: var(--shield-green); box-shadow: inset 0 0 20px rgba(0,230,118,0.05), var(--glow-green); transform: translateY(-5px); }
.f-box img { width: 56px; height: 56px; margin: 0 auto 20px; filter: drop-shadow(0 0 8px var(--shield-green)); }
.f-box h3 { font-size: 18px; font-weight: 800; margin-bottom: 12px; color: var(--text-light); }
.f-box p { font-size: 14px; color: var(--text-muted); }

/* 功能详情 (黑客海报质感) */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 60px; background: linear-gradient(135deg, var(--poster-card), #0D131C); padding: 60px; border-radius: 4px; border-left: 4px solid var(--shield-green); position: relative; overflow: hidden; }
.detail-box:nth-child(even) { flex-direction: row-reverse; border-left: none; border-right: 4px solid var(--shield-gold); }
.detail-box::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(255,255,255,0.01) 10px, rgba(255,255,255,0.01) 20px); pointer-events: none; }
.d-text { flex: 1; position: relative; z-index: 2; }
.d-text h3 { font-size: 32px; font-weight: 900; margin-bottom: 20px; color: var(--text-light); letter-spacing: 1px; }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; font-size: 24px; font-weight: 900; color: var(--shield-green); text-shadow: var(--glow-green); }
.d-visual { flex: 1.2; position: relative; z-index: 2; }
.d-visual img { border: 1px solid var(--border-dark); opacity: 0.9; transition: 0.3s; }
.d-visual:hover img { opacity: 1; border-color: var(--shield-green); box-shadow: var(--glow-green); }

/* 浏览器对比 */
.compare-box { background: var(--poster-card); border: 1px solid var(--border-dark); padding: 40px; border-radius: 4px; overflow-x: auto; }
.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-dark); }
.compare-table th { color: var(--text-muted); font-size: 16px; font-weight: 700; text-transform: uppercase; background: rgba(0,0,0,0.2); }
.compare-table td { font-size: 16px; font-weight: 500; }
.compare-table .hl { background: rgba(0,230,118,0.05); color: var(--shield-green); font-weight: 900; border-left: 2px solid var(--shield-green); border-right: 2px solid var(--shield-green); font-size: 18px; text-shadow: 0 0 5px rgba(0,230,118,0.5); }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载版本区 */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card { background: var(--poster-card); border: 2px solid var(--border-dark); padding: 60px 40px; text-align: center; border-radius: 4px; transition: 0.3s; }
.dl-card:hover { border-color: var(--shield-gold); transform: translateY(-10px); box-shadow: var(--glow-gold); }
.dl-card.rec { border-color: var(--shield-green); box-shadow: var(--glow-green); background: linear-gradient(180deg, rgba(0,230,118,0.05) 0%, var(--poster-card) 100%); }
.dl-card.rec:hover { transform: translateY(-10px); box-shadow: 0 0 40px rgba(0,230,118,0.6); }
.dl-card h3 { font-size: 26px; font-weight: 900; color: var(--text-light); margin-bottom: 20px; }
.dl-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 40px; height: 50px; }
.dl-card .btn { width: 100%; }

/* 数据背书 */
.data-sec { display: flex; justify-content: space-around; padding: 80px 40px; background: #000; border-top: 2px solid var(--border-dark); border-bottom: 2px solid var(--border-dark); margin: 100px 0; position: relative; }
.data-item { text-align: center; position: relative; z-index: 2; }
.data-item h4 { font-size: 64px; font-weight: 900; color: var(--shield-green); text-shadow: var(--glow-green); margin-bottom: 10px; line-height: 1; }
.data-item p { font-size: 18px; font-weight: 700; color: var(--text-light); letter-spacing: 2px; text-transform: uppercase; }

/* FAQ */
.faq-grid { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.faq-box { background: var(--poster-card); border: 1px solid var(--border-dark); padding: 30px; border-radius: 4px; transition: 0.3s; }
.faq-box:hover { border-color: var(--shield-green); box-shadow: 0 0 15px rgba(0,230,118,0.1); }
.faq-box h4 { font-size: 18px; font-weight: 800; color: var(--shield-gold); margin-bottom: 15px; display: flex; align-items: center; gap: 10px; }
.faq-box h4::before { content: '>>'; color: var(--shield-green); font-weight: 900; }
.faq-box p { font-size: 15px; color: var(--text-muted); line-height: 1.8; }

/* Footer */
.footer { background: #05080D; border-top: 1px solid var(--border-dark); text-align: center; padding: 50px; color: var(--text-muted); font-size: 14px; font-weight: 600; letter-spacing: 1px; margin-top: 60px; }