/* roulang page: index */
:root {
            --primary: #10B981;
            --primary-dark: #059669;
            --secondary: #0F172A;
            --accent: #F97316;
            --bg-light: #F8FAFC;
            --bg-dark: #0B0F17;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }

        html {
            scroll-behavior: smooth;
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
        }

        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
            overflow-x: hidden;
        }

        .hero-bg {
            background: linear-gradient(180deg, rgba(11, 15, 23, 0.82) 0%, rgba(15, 23, 42, 0.95) 100%), url('/assets/images/de6dc1576df3d379.png') center/cover no-repeat;
        }

        .dark-tech-bg {
            background: linear-gradient(135deg, #0B0F17 0%, #111827 50%, #0F172A 100%);
        }

        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid var(--border-color);
        }

        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px -10px rgba(0, 0, 0, 0.08);
            border-color: #CBD5E1;
        }

        .tag-pulse {
            animation: pulse-dot 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(1.1); }
        }

        details summary::-webkit-details-marker {
            display: none;
        }

        details[open] summary .faq-icon {
            transform: rotate(180deg);
            color: var(--primary);
        }