/* style.css - 网络安全主题全局样式 */
:root {
    --primary: #10b981;       /* 安全护盾绿 */
    --accent: #059669;        /* 深绿交互色 */
    --bg-main: #0a0f18;       /* 极客深蓝黑背景 */
    --bg-offset: #111827;     /* 卡片底色 */
    --text-main: #f8fafc;     /* 主标题纯白 */
    --text-muted: #94a3b8;    /* 段落灰白 */
    --border: #1e293b;        /* 柔和暗边框 */
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }
body { background-color: var(--bg-main); color: var(--text-muted); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
ul { list-style: none; }

/* 导航栏 */
.header {
    position: fixed; top: 0; width: 100%; height: 80px;
    background: rgba(10, 15, 24, 0.9); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border); z-index: 1000;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.nav-wrapper { display: flex; justify-content: space-between; align-items: center; height: 100%; }
.logo a { font-size: 24px; font-weight: 800; color: var(--text-main); letter-spacing: 1px; }
.logo span { color: var(--primary); }
.nav ul { display: flex; gap: 40px; margin-top: 15px;}
.nav a { font-size: 15px; font-weight: 600; color: var(--text-muted); }
.nav a:hover, .nav a.active { color: var(--primary); }

/* 子页面 Banner */
.page-hero { padding: 180px 20px 80px; background: var(--bg-offset); border-bottom: 1px solid var(--border); text-align: center; }
.page-hero h1 { font-size: 3rem; color: var(--text-main); font-weight: 800; margin-bottom: 16px; letter-spacing: -1px; }
.page-hero p { font-size: 1.2rem; max-width: 600px; margin: 0 auto; }

/* 按钮 */
.btn { display: inline-block; padding: 14px 32px; background: var(--primary); color: #fff; border-radius: 4px; font-weight: 600; font-size: 15px; border: 1px solid transparent; box-shadow: 0 4px 15px rgba(16, 185, 129, 0.2); }
.btn:hover { background: var(--accent); transform: translateY(-2px); }

/* 页脚 */
.footer { background: #05080c; border-top: 1px solid var(--border); padding: 80px 20px 30px; margin-top: 80px; }
.footer-grid { display: flex; justify-content: space-between; gap: 60px; max-width: 1200px; margin: 0 auto; border-bottom: 1px solid var(--border); padding-bottom: 60px; flex-wrap: wrap; }
.footer-grid > div { flex: 1; min-width: 250px; }
.footer h4 { color: #fff; font-size: 1.1rem; margin-bottom: 24px; font-weight: 600; }
.footer ul { padding-left: 0; }
.footer ul li { margin-bottom: 12px; font-size: 0.95rem; }
.email-link { color: var(--primary); font-weight: 600; }
.email-link:hover { text-decoration: underline; }
.footer-bottom { text-align: center; padding-top: 30px; font-size: 0.85rem; }

/* 手机端自适应 */
@media (max-width: 768px) {
    .nav ul { display: none; }
    .page-hero h1 { font-size: 2.2rem; }
    .footer-grid { flex-direction: column; gap: 40px; }
}