:root {
    --primary: #10b981; /* 盾牌绿 */
    --primary-hover: #059669;
    --accent: #3b82f6; /* 安全蓝 */
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(16, 185, 129, 0.2);
    --shadow-3d: 0 10px 30px rgba(0,0,0,0.5), inset 0 1px 1px rgba(255,255,255,0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 3D 背景特效 */
.safe-bg {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -2;
    background: radial-gradient(circle at 50% 30%, #1e293b 0%, #0f172a 100%);
}
.shield-glow {
    position: absolute; top: 10%; left: 50%; transform: translateX(-50%);
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(16,185,129,0.15) 0%, transparent 70%);
    z-index: -1; pointer-events: none;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 10; }

/* 导航 */
header {
    background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 76px; }
.logo-area { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 26px; font-weight: 900; color: #fff; letter-spacing: 1px; }
.logo span { color: var(--primary); text-shadow: 0 0 10px rgba(16,185,129,0.5); }
.sec-badge { border: 1px solid var(--primary); color: var(--primary); padding: 3px 8px; border-radius: 6px; font-size: 12px; font-weight: bold; background: rgba(16,185,129,0.1); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--text-muted); transition: 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* 按钮 - 3D质感 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 14px 36px; border-radius: 8px; font-weight: 800; font-size: 16px;
    cursor: pointer; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    border: none; position: relative;
}
.btn-primary { 
    background: linear-gradient(180deg, #34d399 0%, #10b981 100%); color: #064e3b; 
    box-shadow: 0 6px 0 #059669, 0 15px 20px rgba(16,185,129,0.4);
}
.btn-primary:active { transform: translateY(6px); box-shadow: 0 0 0 #059669, 0 5px 10px rgba(16,185,129,0.4); }
.btn-outline { 
    background: linear-gradient(180deg, #334155 0%, #1e293b 100%); color: var(--primary); 
    border: 1px solid var(--border); box-shadow: 0 6px 0 #0f172a, 0 15px 20px rgba(0,0,0,0.4);
}
.btn-outline:active { transform: translateY(6px); box-shadow: 0 0 0 #0f172a, 0 5px 10px rgba(0,0,0,0.4); }

/* Hero区 */
.hero { padding: 100px 0 80px; text-align: center; perspective: 1000px; }
.hero h1 { font-size: 60px; font-weight: 900; line-height: 1.2; margin-bottom: 24px; color: #fff; text-shadow: 0 10px 20px rgba(0,0,0,0.8); }
.hero h1 span { color: var(--primary); }
.hero p { font-size: 22px; color: var(--text-muted); margin-bottom: 50px; max-width: 650px; margin-left: auto; margin-right: auto; }
.hero-btns { display: flex; justify-content: center; gap: 24px; margin-bottom: 70px; }

/* 3D 浏览器展示框 */
.hero-3d-box {
    max-width: 900px; margin: 0 auto; position: relative;
    transform-style: preserve-3d; transform: rotateX(10deg) rotateY(0deg); transition: transform 0.5s;
    border-radius: 16px; box-shadow: var(--shadow-3d), 0 0 60px rgba(16,185,129,0.15);
    border: 2px solid rgba(16,185,129,0.3); background: #fff; padding: 5px;
}
.hero-3d-box:hover { transform: rotateX(0deg) rotateY(0deg); }
.hero-3d-box::before { /* 模拟 3D 锁效果 */
    content: '🔒 军工级防护'; position: absolute; top: -20px; left: 50%; transform: translateX(-50%) translateZ(50px);
    background: var(--primary); color: #000; padding: 8px 24px; border-radius: 20px; font-weight: 900; font-size: 14px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.5); border: 2px solid #34d399;
}

/* 模块通用 */
section { padding: 90px 0; border-bottom: 1px solid rgba(255,255,255,0.02); }
.sec-title { text-align: center; font-size: 38px; font-weight: 900; margin-bottom: 60px; color: #fff; text-shadow: 0 2px 4px rgba(0,0,0,0.5); }
.sec-title span { color: var(--primary); }

/* 核心卖点 - 3D 悬浮卡片 */
.features { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; perspective: 1000px; }
.f-card {
    background: linear-gradient(145deg, var(--bg-card) 0%, #0f172a 100%);
    border: 1px solid rgba(255,255,255,0.05); padding: 35px 20px; text-align: center;
    border-radius: 12px; transition: 0.4s; box-shadow: var(--shadow-3d);
}
.f-card:hover { transform: translateZ(30px) translateY(-10px); border-color: var(--primary); box-shadow: 0 20px 40px rgba(0,0,0,0.6), inset 0 0 20px rgba(16,185,129,0.1); }
.f-card img { width: 64px; height: 64px; margin: 0 auto 20px; filter: drop-shadow(0 10px 10px rgba(0,0,0,0.5)); }
.f-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 12px; color: var(--primary); }
.f-card p { font-size: 14px; color: var(--text-muted); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 32px; font-weight: 900; margin-bottom: 20px; color: #fff; display: flex; align-items: center; gap: 15px; }
.d-text h3::before { content: ''; display: block; width: 6px; height: 32px; background: var(--primary); border-radius: 3px; box-shadow: 0 0 10px var(--primary); }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 25px; line-height: 1.8; }
.d-tag { display: inline-block; background: rgba(16,185,129,0.1); color: var(--primary); padding: 8px 16px; border-radius: 6px; font-weight: bold; border: 1px solid var(--border); }
.d-img { flex: 1; border-radius: 12px; padding: 10px; background: var(--bg-card); box-shadow: var(--shadow-3d); border: 1px solid rgba(255,255,255,0.05); }

/* 对比表格 */
.compare-box { background: var(--bg-card); border-radius: 16px; padding: 40px; box-shadow: var(--shadow-3d); border: 1px solid rgba(255,255,255,0.05); }
.compare-tb { width: 100%; border-collapse: collapse; text-align: center; }
.compare-tb th, .compare-tb td { padding: 20px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.compare-tb th { font-size: 16px; color: var(--text-muted); font-weight: 700; text-transform: uppercase; }
.compare-tb .hl { color: var(--primary); font-weight: 900; font-size: 18px; background: rgba(16,185,129,0.05); border-radius: 8px; }

/* 版本下载 */
.v-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.v-card {
    background: var(--bg-card); border: 1px solid rgba(255,255,255,0.05);
    padding: 50px 30px; text-align: center; border-radius: 16px; transition: 0.4s;
    box-shadow: var(--shadow-3d); position: relative; overflow: hidden;
}
.v-card:hover { border-color: var(--primary); transform: translateY(-10px); }
.v-card.rec { border-color: var(--primary); background: linear-gradient(180deg, rgba(16,185,129,0.1) 0%, var(--bg-card) 100%); }
.v-card.rec::after { content: '🛡️ 满级防护'; position: absolute; top: 15px; right: -30px; background: var(--primary); color: #000; font-weight: 900; padding: 5px 35px; transform: rotate(45deg); font-size: 12px; }
.v-card h3 { font-size: 28px; font-weight: 900; margin-bottom: 15px; color: #fff; }
.v-card p { color: var(--text-muted); margin-bottom: 40px; height: 48px; }

/* 数据展示 */
.data-sec { background: rgba(0,0,0,0.5); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); position: relative; }
.data-sec::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: url('assets/bg-pattern.png'); opacity: 0.05; pointer-events: none; }
.data-wrap { display: flex; justify-content: space-around; flex-wrap: wrap; text-align: center; gap: 30px; position: relative; z-index: 2; }
.data-item h4 { font-size: 56px; font-weight: 900; color: var(--primary); text-shadow: 0 5px 15px rgba(0,0,0,0.8); margin-bottom: 5px; }
.data-item p { font-size: 16px; color: var(--text-main); font-weight: 700; letter-spacing: 1px; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.faq-box { background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.05); padding: 25px; border-radius: 12px; border-left: 4px solid var(--primary); box-shadow: 0 4px 6px rgba(0,0,0,0.3); }
.faq-box h4 { font-size: 16px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.faq-box p { font-size: 14px; color: var(--text-muted); }

footer { padding: 40px 0; text-align: center; color: var(--text-muted); font-size: 14px; background: #000; }