:root {
    --primary: #00ff88; /* 科技绿 */
    --primary-glow: rgba(0, 255, 136, 0.4);
    --bg-deep: #050b08; /* 深邃太空黑 */
    --bg-card: rgba(10, 25, 15, 0.7);
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --border: rgba(0, 255, 136, 0.2);
    --sphere-glow: 0 0 80px rgba(0, 255, 136, 0.3), inset 0 0 40px rgba(0, 255, 136, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-deep); 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; }

/* 动态网络节点背景 */
.network-bg {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -2;
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(0,255,136,0.05) 0%, transparent 20%),
        radial-gradient(circle at 85% 80%, rgba(0,255,136,0.05) 0%, transparent 20%);
}
.stars {
    position: absolute; width: 100%; height: 100%;
    background-image: radial-gradient(1px 1px at 20px 30px, #ffffff, rgba(0,0,0,0)), radial-gradient(1px 1px at 40px 70px, #ffffff, rgba(0,0,0,0)), radial-gradient(1px 1px at 50px 160px, #ffffff, rgba(0,0,0,0)), radial-gradient(1px 1px at 90px 40px, #ffffff, rgba(0,0,0,0));
    background-repeat: repeat; background-size: 200px 200px; opacity: 0.2; animation: twinkle 5s infinite linear;
}
@keyframes twinkle { 0% { opacity: 0.2; } 50% { opacity: 0.4; } 100% { opacity: 0.2; } }

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

/* 导航 */
header {
    background: rgba(5, 11, 8, 0.85); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 75px; }
.logo { font-size: 26px; font-weight: 900; color: #fff; letter-spacing: 1px; display: flex; align-items: center; gap: 10px; }
.logo::before { content: ''; display: inline-block; width: 20px; height: 20px; border-radius: 50%; background: radial-gradient(circle, var(--primary) 0%, transparent 70%); box-shadow: 0 0 10px var(--primary); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 15px; font-weight: 600; text-transform: uppercase; color: var(--text-muted); letter-spacing: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); text-shadow: 0 0 10px var(--primary-glow); }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 14px 36px; border-radius: 4px; font-weight: 800; font-size: 16px;
    letter-spacing: 1px; cursor: pointer; transition: all 0.3s;
    position: relative; overflow: hidden; border: 1px solid transparent; text-transform: uppercase;
}
.btn-primary { background: var(--primary); color: #000; box-shadow: 0 0 20px var(--primary-glow); }
.btn-primary:hover { background: #fff; box-shadow: 0 0 30px rgba(255,255,255,0.6); }
.btn-outline { background: rgba(0,255,136,0.05); color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: rgba(0,255,136,0.15); box-shadow: inset 0 0 15px var(--primary-glow); }

/* Hero 区：科技球体 */
.hero { padding: 120px 0 80px; text-align: center; position: relative; }
.planet-sphere {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 600px; height: 600px; border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(0,255,136,0.1), transparent 60%);
    box-shadow: var(--sphere-glow); z-index: -1; pointer-events: none;
    animation: rotateSphere 20s infinite linear; border: 1px dashed rgba(0,255,136,0.2);
}
@keyframes rotateSphere { 100% { transform: translate(-50%, -50%) rotate(360deg); } }

.hero h1 { font-size: 60px; font-weight: 900; line-height: 1.2; margin-bottom: 20px; color: #fff; text-shadow: 0 10px 30px rgba(0,0,0,0.8); }
.hero h1 span { color: var(--primary); }
.hero p { font-size: 20px; 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; }

.hero-browser {
    max-width: 900px; margin: 0 auto; position: relative;
    border-radius: 12px; border: 1px solid var(--border);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 30px rgba(0,255,136,0.15);
    background: var(--bg-card); backdrop-filter: blur(10px); padding: 5px;
}
.hero-browser img { width: 100%; border-radius: 8px; opacity: 0.9; }

/* 模块通用 */
section { padding: 90px 0; border-bottom: 1px solid rgba(255,255,255,0.03); position: relative; }
.sec-title { text-align: center; font-size: 38px; font-weight: 900; margin-bottom: 60px; color: #fff; letter-spacing: 2px; }
.sec-title span { color: var(--primary); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-node {
    background: var(--bg-card); border: 1px solid var(--border); padding: 35px 20px;
    text-align: center; border-radius: 8px; transition: 0.3s; position: relative;
    backdrop-filter: blur(10px);
}
.f-node::before { content: ''; position: absolute; top: -1px; left: 50%; transform: translateX(-50%); width: 30px; height: 3px; background: var(--primary); box-shadow: 0 0 10px var(--primary); transition: 0.3s; }
.f-node:hover { transform: translateY(-10px); box-shadow: 0 10px 30px rgba(0,255,136,0.1); }
.f-node:hover::before { width: 100%; }
.f-node img { width: 50px; height: 50px; margin: 0 auto 20px; filter: drop-shadow(0 0 8px var(--primary)); }
.f-node h3 { font-size: 17px; font-weight: 800; color: #fff; margin-bottom: 10px; }
.f-node p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-box: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; }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 25px; line-height: 1.8; }
.d-tag { display: inline-block; background: rgba(0,255,136,0.1); color: var(--primary); border: 1px solid var(--border); padding: 6px 15px; border-radius: 4px; font-size: 14px; font-weight: bold; }
.d-img { flex: 1; border-radius: 12px; padding: 10px; background: var(--bg-card); border: 1px solid var(--border); box-shadow: 0 0 30px rgba(0,255,136,0.05); }

/* 对比表格 */
.compare-wrap { background: var(--bg-card); border-radius: 16px; padding: 40px; border: 1px solid var(--border); backdrop-filter: blur(10px); }
.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: 15px; color: var(--text-muted); font-weight: 700; text-transform: uppercase; }
.compare-tb .hl { color: var(--primary); font-weight: 900; font-size: 18px; background: rgba(0,255,136,0.05); 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 var(--border); padding: 50px 30px;
    text-align: center; border-radius: 12px; transition: 0.4s; position: relative; overflow: hidden;
}
.v-card:hover { border-color: var(--primary); box-shadow: 0 0 30px rgba(0,255,136,0.15); transform: translateY(-5px); }
.v-card.rec { border-color: var(--primary); background: radial-gradient(circle at top, rgba(0,255,136,0.1) 0%, transparent 60%); }
.v-card.rec::after { content: '官方推荐节点'; position: absolute; top: 15px; right: -30px; background: var(--primary); color: #000; font-weight: 900; padding: 4px 30px; transform: rotate(45deg); font-size: 12px; }
.v-card h3 { font-size: 26px; font-weight: 900; color: #fff; margin-bottom: 15px; }
.v-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 35px; height: 42px; }

/* 数据展示 */
.data-sec { background: rgba(0,0,0,0.4); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 60px 0; }
.data-flex { display: flex; justify-content: space-around; flex-wrap: wrap; text-align: center; gap: 30px; }
.data-item h4 { font-size: 56px; font-weight: 900; color: var(--primary); text-shadow: 0 0 20px var(--primary-glow); margin-bottom: 5px; font-family: monospace; }
.data-item p { font-size: 15px; color: var(--text-main); font-weight: bold; letter-spacing: 1px; text-transform: uppercase; }

/* 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: 8px; border-left: 2px solid var(--primary); transition: 0.3s; }
.faq-box:hover { background: rgba(0,255,136,0.03); border-color: var(--border); }
.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: 13px; background: #000; text-transform: uppercase; letter-spacing: 1px; }