/* roulang page: index */
:root {
            --brand-primary: #0F766E;
            --brand-hover: #0D9488;
            --navy-dark: #0F172A;
            --alert-orange: #EA580C;
            --bg-canvas: #F8FAFC;
            --card-border: #E2E8F0;
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            font-family: var(--font-stack);
            background-color: var(--bg-canvas);
            color: #334155;
            line-height: 1.68;
            -webkit-font-smoothing: antialiased;
        }

        .hero-banner-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 118, 110, 0.88) 100%), url('/assets/images/aee887022ac4b544.webp');
            background-size: cover;
            background-position: center;
        }

        .cert-card-bg {
            background-image: linear-gradient(to right, rgba(240, 253, 250, 0.95), rgba(255, 255, 255, 0.98)), url('/assets/images/43df169b16248550.webp');
            background-size: cover;
        }

        .dark-security-bg {
            background-image: radial-gradient(circle at 80% 20%, rgba(15, 118, 110, 0.25) 0%, rgba(15, 23, 42, 1) 75%), url('/assets/images/ee6a3fbdea4fd939.webp');
            background-size: cover;
        }

        .cta-box-bg {
            background-image: linear-gradient(120deg, rgba(15, 23, 42, 0.96) 30%, rgba(17, 94, 89, 0.92) 100%), url('/assets/images/a255f750881be78f.webp');
            background-size: cover;
        }

        .transition-base {
            transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-hover:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px -8px rgba(15, 118, 110, 0.12);
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
        }

        .accordion-content.expanded {
            max-height: 500px;
            transition: max-height 0.35s ease-in-out;
        }