:root {
    --bg-dark: #0a0f16;
    --bg-surface: #111827;
    --border-color: #1f2937;
    --text-main: #f9fafb;
    --text-secondary: #9ca3af;
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --success-green: #10b981;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body, html {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* 背景 Canvas 挂载，设置低透明度，绝不喧宾夺主 */
#meshCanvas {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: 0; opacity: 0.6; pointer-events: none;
}

.ui-container {
    position: relative; z-index: 10;
}

/* === 极简企业导航 === */
.navbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.5rem 4%; background: rgba(10, 15, 22, 0.8);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 100;
}

.brand {
    font-size: 1.1rem; font-weight: 700; letter-spacing: 1px; color: var(--text-main);
}

.nav-actions { display: flex; align-items: center; gap: 2rem; }
.nav-link { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
.nav-link:hover { color: var(--text-main); }

/* === 按钮系统 === */
.btn-primary, .btn-secondary, .btn-primary-small {
    display: inline-block; font-family: inherit; font-weight: 500;
    text-decoration: none; border-radius: 4px; transition: all 0.2s; cursor: pointer;
}

.btn-primary-small {
    padding: 0.5rem 1rem; font-size: 0.85rem;
    background-color: var(--accent-blue); color: #fff; border: none;
}
.btn-primary-small:hover { background-color: var(--accent-blue-hover); }

.btn-primary {
    padding: 0.8rem 1.8rem; font-size: 1rem;
    background-color: var(--accent-blue); color: #fff; border: 1px solid var(--accent-blue);
}
.btn-primary:hover { background-color: var(--accent-blue-hover); box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3); }

.btn-secondary {
    padding: 0.8rem 1.8rem; font-size: 1rem;
    background-color: transparent; color: var(--text-main); border: 1px solid var(--border-color);
}
.btn-secondary:hover { background-color: rgba(255, 255, 255, 0.05); border-color: var(--text-secondary); }

/* === 首屏排版 === */
.hero {
    min-height: 80vh; display: flex; align-items: center; padding: 0 4%;
    border-bottom: 1px solid var(--border-color);
}

.hero-content { max-width: 800px; }

.system-status {
    display: inline-flex; align-items: center; padding: 0.4rem 0.8rem;
    background: rgba(16, 185, 129, 0.1); border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 50px; margin-bottom: 2rem;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background-color: var(--success-green); margin-right: 8px; }
.status-text { color: var(--success-green); font-size: 0.75rem; font-weight: 600; letter-spacing: 1px; }

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem); font-weight: 700; line-height: 1.1;
    color: #ffffff; margin-bottom: 1.5rem; letter-spacing: -1px;
}

.hero-description {
    font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 2.5rem;
    line-height: 1.7; max-width: 700px;
}

.hero-buttons { display: flex; gap: 1rem; }

/* === 内容模块 === */
.module-section { padding: 6rem 4%; border-bottom: 1px solid var(--border-color); }

.section-heading {
    font-size: 2rem; font-weight: 700; margin-bottom: 3rem; color: var(--text-main);
}

.card-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem;
}

.info-card {
    background-color: var(--bg-surface); border: 1px solid var(--border-color);
    padding: 2.5rem; border-radius: 6px; transition: transform 0.2s, border-color 0.2s;
}
.info-card:hover { transform: translateY(-4px); border-color: var(--text-secondary); }

.card-icon { width: 32px; height: 32px; color: var(--accent-blue); margin-bottom: 1.5rem; }
.info-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 1rem; }
.info-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; }

/* === 数据指标条 === */
.metrics-section {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    border-bottom: 1px solid var(--border-color); background-color: rgba(17, 24, 39, 0.5);
}

.metric-block {
    padding: 4rem 2rem; text-align: center; border-right: 1px solid var(--border-color);
}
.metric-block:last-child { border-right: none; }

.metric-value { font-size: 3rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.5rem; letter-spacing: -1px; }
.metric-label { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; text-transform: uppercase; letter-spacing: 1px; }

/* === 页脚 === */
.enterprise-footer { padding: 5rem 4% 3rem 4%; background-color: var(--bg-dark); }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4rem; margin-bottom: 4rem; }
.footer-legal { max-width: 500px; }
.footer-legal h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; }
.compliance-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

.footer-links h4 { font-size: 0.9rem; font-weight: 600; color: var(--text-main); margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 1px; }
.footer-links a { display: block; color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; margin-bottom: 0.8rem; }
.footer-links a:hover { color: var(--text-main); }

.footer-copyright { border-top: 1px solid var(--border-color); padding-top: 2rem; font-size: 0.8rem; color: var(--text-secondary); }

@media (max-width: 768px) {
    .hero-title { font-size: 2.5rem; }
    .hero-buttons { flex-direction: column; }
    .nav-actions { display: none; } /* 移动端精简 */
    .metric-block { border-right: none; border-bottom: 1px solid var(--border-color); }
}