:root {
    --bg-dark: #0A1118; /* 深邃系统蓝黑 */
    --bg-panel: #111A24;
    --shield-green: #00D26A; /* 安全护盾绿 */
    --shield-glow: rgba(0, 210, 106, 0.4);
    --alert-red: #FF4D4F;
    --text-main: #FFFFFF;
    --text-muted: #8F9BA8;
    --border-color: #1F2D3D;
    --font-sys: "Consolas", "Microsoft YaHei", monospace, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-sys); background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 4px; }
ul { list-style: none; }

/* 扫描线背景动画 */
.scan-line { position: fixed; top: 0; left: 0; width: 100%; height: 2px; background: var(--shield-green); box-shadow: 0 0 10px var(--shield-glow); opacity: 0.5; z-index: 9999; animation: scan 4s linear infinite; pointer-events: none; }
@keyframes scan { 0% { top: 0; } 100% { top: 100%; } }

/* 导航 */
.header { background: rgba(10, 17, 24, 0.95); border-bottom: 1px solid var(--border-color); 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: 70px; padding: 0 20px; }
.logo { font-size: 22px; font-weight: bold; color: var(--text-main); display: flex; align-items: center; gap: 10px; }
.logo img { width: 32px; height: 32px; filter: drop-shadow(0 0 5px var(--shield-green)); }
.logo span { color: var(--shield-green); font-family: "Microsoft YaHei", sans-serif; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; color: var(--text-muted); font-family: "Microsoft YaHei", sans-serif; position: relative; padding: 5px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--shield-green); text-shadow: 0 0 8px var(--shield-glow); }
.nav-links a.active::after { content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background: var(--shield-green); box-shadow: 0 0 5px var(--shield-green); }

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

/* 系统按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 36px; border-radius: 2px; font-size: 16px; font-weight: bold; cursor: pointer; transition: 0.3s; font-family: "Microsoft YaHei", sans-serif; letter-spacing: 1px; }
.btn-primary { background: transparent; color: var(--shield-green); border: 1px solid var(--shield-green); box-shadow: inset 0 0 10px rgba(0, 210, 106, 0.2); }
.btn-primary:hover { background: var(--shield-green); color: #000; box-shadow: 0 0 20px var(--shield-glow); }
.btn-outline { background: var(--bg-panel); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-outline:hover { border-color: var(--text-muted); }

/* 首屏 Hero区 */
.hero { display: flex; align-items: center; gap: 50px; padding: 80px 20px 100px; max-width: 1200px; margin: 0 auto; position: relative; }
.hero::before { content: 'SYSTEM STATUS: SECURE'; position: absolute; top: 20px; right: 20px; color: var(--shield-green); font-size: 12px; font-family: monospace; letter-spacing: 2px; border: 1px solid var(--shield-green); padding: 4px 10px; background: rgba(0, 210, 106, 0.1); }
.hero-content { flex: 1.1; }
.hero-content h1 { font-size: 52px; font-weight: 900; color: var(--text-main); margin-bottom: 16px; font-family: "Microsoft YaHei", sans-serif; line-height: 1.1; }
.hero-content .subtitle { font-size: 24px; color: var(--shield-green); margin-bottom: 24px; text-shadow: 0 0 10px var(--shield-glow); }
.hero-content .desc { font-size: 15px; color: var(--text-muted); margin-bottom: 40px; line-height: 1.8; font-family: "Microsoft YaHei", sans-serif; background: rgba(0,0,0,0.3); padding: 15px; border-left: 3px solid var(--shield-green); }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1; position: relative; }
.shield-ring { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 120%; height: 120%; border: 1px dashed var(--shield-green); border-radius: 50%; opacity: 0.3; animation: spin 15s linear infinite; pointer-events: none; }
@keyframes spin { 100% { transform: translate(-50%, -50%) rotate(360deg); } }
.hero-visual img { border: 2px solid var(--shield-green); box-shadow: 0 0 30px var(--shield-glow); position: relative; z-index: 2; }

/* 模块标题 */
.sec-title { text-align: center; font-size: 32px; font-weight: bold; color: var(--text-main); margin-bottom: 60px; font-family: "Microsoft YaHei", sans-serif; letter-spacing: 2px; }
.sec-title::after { content: '_'; color: var(--shield-green); animation: blink 1s infinite; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--bg-panel); padding: 30px 15px; text-align: center; border: 1px solid var(--border-color); position: relative; overflow: hidden; transition: 0.3s; }
.f-box::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 2px; background: var(--shield-green); transform: scaleX(0); transition: 0.3s; transform-origin: left; }
.f-box:hover { border-color: var(--shield-green); box-shadow: 0 5px 15px rgba(0,0,0,0.5); }
.f-box:hover::before { transform: scaleX(1); }
.f-box img { width: 50px; height: 50px; margin: 0 auto 15px; filter: grayscale(100%) brightness(200%) sepia(100%) hue-rotate(80deg) saturate(500%); }
.f-box h3 { font-size: 16px; color: var(--text-main); margin-bottom: 8px; font-family: "Microsoft YaHei", sans-serif; }
.f-box p { font-size: 12px; color: var(--text-muted); }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; background: var(--bg-panel); padding: 40px; border: 1px solid var(--border-color); }
.detail-box:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 26px; color: var(--shield-green); margin-bottom: 20px; font-family: "Microsoft YaHei", sans-serif; display: flex; align-items: center; gap: 10px; }
.d-text h3::before { content: '>'; color: var(--text-muted); }
.d-text p { font-size: 15px; color: var(--text-muted); margin-bottom: 24px; line-height: 1.8; font-family: "Microsoft YaHei", sans-serif; }
.d-data { display: inline-block; padding: 8px 15px; background: #000; border: 1px solid var(--shield-green); color: var(--shield-green); font-size: 14px; }
.d-visual { flex: 1; }
.d-visual img { border: 1px solid var(--border-color); opacity: 0.8; transition: 0.3s; }
.d-visual:hover img { opacity: 1; border-color: var(--shield-green); box-shadow: 0 0 15px var(--shield-glow); }

/* 浏览器对比 */
.compare-box { background: var(--bg-panel); border: 1px solid var(--border-color); overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; font-family: "Microsoft YaHei", sans-serif; }
.compare-table th, .compare-table td { padding: 20px 25px; border-bottom: 1px solid var(--border-color); }
.compare-table th { color: var(--shield-green); font-size: 14px; text-transform: uppercase; background: rgba(0,0,0,0.5); }
.compare-table td { font-size: 14px; color: var(--text-muted); }
.compare-table .hl { color: var(--text-main); font-weight: bold; background: rgba(0, 210, 106, 0.05); border-left: 1px solid var(--shield-green); border-right: 1px solid var(--shield-green); }
.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: 20px; }
.dl-card { background: var(--bg-panel); border: 1px solid var(--border-color); padding: 40px 30px; text-align: center; position: relative; font-family: "Microsoft YaHei", sans-serif; }
.dl-card:hover { border-color: var(--text-muted); }
.dl-card.rec { border: 1px solid var(--shield-green); box-shadow: inset 0 0 20px rgba(0, 210, 106, 0.1); }
.dl-card.rec::before { content: 'SYSTEM REC'; position: absolute; top: 0; left: 0; background: var(--shield-green); color: #000; padding: 2px 10px; font-size: 12px; font-weight: bold; font-family: monospace; }
.dl-card h3 { font-size: 22px; color: var(--text-main); margin-bottom: 15px; }
.dl-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; height: 60px; text-align: left; }
.dl-card .btn { width: 100%; }

/* 数据背书 */
.data-sec { background: #000; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); padding: 60px 20px; margin: 80px 0; }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; }
.data-item { text-align: center; }
.data-item h4 { font-size: 48px; font-weight: bold; color: var(--text-main); margin-bottom: 5px; font-family: monospace; }
.data-item p { font-size: 14px; color: var(--shield-green); text-transform: uppercase; letter-spacing: 1px; }

/* FAQ */
.faq-grid { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 15px; }
.faq-box { background: var(--bg-panel); border: 1px solid var(--border-color); padding: 25px; transition: 0.3s; }
.faq-box:hover { border-color: var(--shield-green); }
.faq-box h4 { font-size: 16px; color: var(--text-main); margin-bottom: 12px; font-family: "Microsoft YaHei", sans-serif; display: flex; align-items: center; gap: 10px; }
.faq-box h4::before { content: '[?]'; color: var(--shield-green); font-family: monospace; }
.faq-box p { font-size: 14px; color: var(--text-muted); line-height: 1.6; font-family: "Microsoft YaHei", sans-serif; }

/* Footer */
.footer { background: #000; border-top: 1px solid var(--shield-green); text-align: center; padding: 40px; color: var(--text-muted); font-size: 12px; font-family: monospace; margin-top: 60px; }