:root {
    --bg-dark: #020C06; /* 深邃的安全黑绿 */
    --bg-panel: #061A0E;
    --sec-green: #00E676; /* 安全防护绿 */
    --sec-green-glow: rgba(0, 230, 118, 0.4);
    --sec-green-dim: rgba(0, 230, 118, 0.1);
    --sec-shield: #1B5E20;
    --text-main: #E2E8F0;
    --text-muted: #8F9A94;
    --border-color: rgba(0, 230, 118, 0.2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: "Microsoft YaHei", -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* 数据流与扫描线背景 */
.data-stream {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -2;
    background: 
        linear-gradient(rgba(0, 230, 118, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 230, 118, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
.scan-line {
    position: fixed; top: 0; left: 0; width: 100%; height: 8px; z-index: -1;
    background: rgba(0, 230, 118, 0.3);
    box-shadow: 0 0 20px var(--sec-green);
    animation: scan 8s linear infinite; pointer-events: none; opacity: 0.6;
}
@keyframes scan {
    0% { top: -10px; }
    100% { top: 100vh; }
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; }

/* 导航 */
.header {
    background: rgba(2, 12, 6, 0.9); backdrop-filter: blur(15px);
    border-bottom: 2px solid var(--sec-shield);
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    position: sticky; top: 0; z-index: 1000;
}
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; }
.logo { font-size: 22px; font-weight: 800; color: #FFF; display: flex; align-items: center; gap: 12px; letter-spacing: 1px; }
.logo-icon { width: 36px; height: 36px; border: 2px solid var(--sec-green); border-radius: 8px; box-shadow: 0 0 10px var(--sec-green-glow); padding: 2px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--text-muted); position: relative; padding-bottom: 5px; }
.nav-links a:hover, .nav-links a.active { color: var(--sec-green); text-shadow: 0 0 8px var(--sec-green-glow); }
.nav-links a.active::after { content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background: var(--sec-green); box-shadow: 0 0 8px var(--sec-green); }

/* 按钮 - 锁与盾牌意象 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; padding: 16px 36px;
    border-radius: 4px; font-size: 16px; font-weight: 800; cursor: pointer; transition: 0.3s;
    letter-spacing: 1px; text-transform: uppercase; position: relative; overflow: hidden;
    clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}
.btn-primary {
    background: linear-gradient(135deg, #00C853, #00E676); color: #000;
    box-shadow: inset 0 0 10px rgba(255,255,255,0.5); border: none;
}
.btn-primary:hover { filter: brightness(1.2); box-shadow: inset 0 0 20px rgba(255,255,255,0.8), 0 0 20px var(--sec-green-glow); }
.btn-outline {
    background: var(--bg-panel); color: var(--sec-green);
    border: 1px solid var(--sec-green); box-shadow: inset 0 0 10px var(--sec-green-dim);
}
.btn-outline:hover { background: var(--sec-green-dim); box-shadow: inset 0 0 20px var(--sec-green-glow); }

/* 容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; position: relative; z-index: 1; }
.sec-title { text-align: center; font-size: 36px; font-weight: 800; margin-bottom: 15px; color: #FFF; letter-spacing: 2px; display: flex; align-items: center; justify-content: center; gap: 15px; }
.sec-title::before, .sec-title::after { content: ''; width: 40px; height: 2px; background: var(--sec-green); box-shadow: 0 0 8px var(--sec-green); }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-muted); margin-bottom: 60px; letter-spacing: 1px; }

/* 盾牌型卡片 */
.shield-card {
    background: var(--bg-panel); border: 1px solid var(--border-color);
    position: relative; transition: 0.3s;
}
.shield-card::before {
    content: ''; position: absolute; top: -1px; left: -1px; width: 20px; height: 20px;
    border-top: 2px solid var(--sec-green); border-left: 2px solid var(--sec-green);
}
.shield-card::after {
    content: ''; position: absolute; bottom: -1px; right: -1px; width: 20px; height: 20px;
    border-bottom: 2px solid var(--sec-green); border-right: 2px solid var(--sec-green);
}
.shield-card:hover { border-color: var(--sec-green); box-shadow: 0 0 30px var(--sec-green-dim); }

/* Hero区 */
.hero { text-align: center; padding: 100px 20px 80px; position: relative; }
.hero h1 { font-size: 60px; font-weight: 900; margin-bottom: 20px; color: #FFF; text-shadow: 0 0 20px var(--sec-green-glow); letter-spacing: 2px; }
.hero .subtitle { font-size: 24px; color: var(--sec-green); font-weight: 700; margin-bottom: 50px; letter-spacing: 4px; }
.hero-btns { display: flex; justify-content: center; gap: 30px; margin-bottom: 60px; }
.hero-visual { max-width: 900px; margin: 0 auto; position: relative; padding: 20px; background: radial-gradient(circle, var(--sec-green-dim) 0%, transparent 70%); }
.hero-visual img { border: 2px solid var(--sec-green); border-radius: 8px; box-shadow: 0 0 40px rgba(0, 230, 118, 0.3); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { text-align: center; padding: 35px 20px; clip-path: polygon(50% 0%, 100% 10%, 100% 80%, 50% 100%, 0% 80%, 0% 10%); background: var(--bg-panel); border: 2px solid var(--border-color); transition: 0.3s; position: relative; }
.f-box:hover { background: var(--sec-shield); box-shadow: 0 0 30px var(--sec-green-glow); transform: translateY(-5px); border-color: var(--sec-green); }
.f-icon { width: 50px; height: 50px; margin: 0 auto 15px; display: flex; align-items: center; justify-content: center; filter: drop-shadow(0 0 8px var(--sec-green)); }
.f-icon img { filter: invert(55%) sepia(85%) saturate(382%) hue-rotate(95deg) brightness(97%) contrast(97%); }
.f-box h3 { font-size: 16px; font-weight: 800; color: #FFF; margin-bottom: 10px; }
.f-box p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 50px; margin-bottom: 80px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 32px; font-weight: 800; color: var(--sec-green); margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.d-text h3::before { content: '🔒'; font-size: 24px; filter: drop-shadow(0 0 5px var(--sec-green)); }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 10px 20px; border: 1px solid var(--sec-green); color: var(--sec-green); font-weight: bold; background: var(--sec-green-dim); font-family: monospace; font-size: 16px; letter-spacing: 1px; }
.d-visual { flex: 1; padding: 20px; border: 1px solid var(--border-color); background: var(--bg-panel); border-radius: 8px; position: relative; box-shadow: inset 0 0 20px #000; }
.d-visual img { border: 1px solid var(--sec-green); opacity: 0.9; }
.d-visual::after { content: 'SCANNING...'; position: absolute; top: 30px; right: 30px; color: var(--sec-green); font-family: monospace; font-size: 12px; animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* 浏览器对比 */
.compare-box { padding: 40px; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px; border-bottom: 1px solid #113322; }
.compare-table th { font-weight: 800; color: var(--text-muted); text-transform: uppercase; font-size: 14px; letter-spacing: 2px; }
.compare-table td { font-weight: 600; color: #CCC; }
.compare-table .hl { color: var(--sec-green); background: var(--sec-green-dim); font-size: 16px; border-left: 3px solid var(--sec-green); font-weight: 800; text-shadow: 0 0 8px var(--sec-green-glow); }

/* 数据背书 */
.data-sec { background: #010804; border-top: 2px solid var(--sec-shield); border-bottom: 2px solid var(--sec-shield); padding: 80px 0; margin: 40px 0; position: relative; }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; align-items: center; text-align: center; }
.data-item h4 { font-size: 56px; font-weight: 900; color: #FFF; margin-bottom: 10px; font-family: monospace; text-shadow: 0 0 20px var(--sec-green-glow); }
.data-item p { font-size: 15px; color: var(--sec-green); font-weight: bold; letter-spacing: 1px; }
.data-icon { width: 80px; height: 80px; filter: drop-shadow(0 0 15px var(--sec-green)); }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card { padding: 40px 30px; text-align: center; }
.dl-card h3 { font-size: 22px; font-weight: 800; color: #FFF; margin-bottom: 15px; }
.dl-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; height: 48px; }
.dl-card .btn { width: 100%; }
.dl-card.pro { border-color: var(--sec-green); box-shadow: 0 0 30px var(--sec-green-dim); background: linear-gradient(180deg, var(--sec-green-dim), var(--bg-panel)); }
.dl-card.pro h3 { color: var(--sec-green); }

/* FAQ */
.faq-wrap { max-width: 900px; margin: 0 auto; }
.faq-item { margin-bottom: 20px; padding: 25px; border-left: 3px solid var(--sec-shield); background: var(--bg-panel); transition: 0.3s; }
.faq-item:hover { border-left-color: var(--sec-green); background: rgba(0, 230, 118, 0.05); }
.faq-item h4 { font-size: 18px; font-weight: 700; color: #FFF; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.faq-item h4::before { content: "SEC:"; color: var(--sec-green); font-family: monospace; font-size: 14px; background: rgba(0, 230, 118, 0.1); padding: 2px 5px; border-radius: 3px; }
.faq-item p { font-size: 15px; color: var(--text-muted); line-height: 1.7; padding-left: 45px; }

/* Footer */
.footer { border-top: 1px solid var(--border-color); padding: 40px 20px; text-align: center; color: var(--text-muted); font-size: 14px; margin-top: 60px; background: #010603; }
.footer span { color: var(--sec-green); font-family: monospace; }