/* roulang page: index */
:root {
            --color-primary: #00F2A9;
            --color-primary-dark: #00A887;
            --color-secondary-purple: #7928CA;
            --color-bg-light: #F8FAFC;
            --color-bg-white: #FFFFFF;
            --color-bg-dark: #0B0F19;
            --color-text-main: #0F172A;
            --color-text-muted: #475569;
            --color-border: #E2E8F0;
            --shadow-card: 0 10px 30px -5px rgba(0, 168, 135, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
            --shadow-glow: 0 0 25px rgba(0, 242, 169, 0.35);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--color-bg-light);
            color: var(--color-text-main);
            overflow-x: hidden;
        }

        .gradient-text {
            background: linear-gradient(135deg, #00A887 0%, #7928CA 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .gradient-text-light {
            background: linear-gradient(135deg, #00F2A9 0%, #38BDF8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .brand-gradient-btn {
            background: linear-gradient(135deg, #00F2A9 0%, #00A887 100%);
            transition: all 0.3s ease;
        }

        .brand-gradient-btn:hover {
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }

        .bento-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border: 1px solid var(--color-border);
            border-radius: 1.25rem;
            box-shadow: var(--shadow-card);
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease;
        }

        .bento-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 35px -5px rgba(0, 168, 135, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            border-color: #A7F3D0;
        }

        .dark-card {
            background: rgba(18, 24, 38, 0.85);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 1.25rem;
            transition: all 0.3s ease;
        }

        .dark-card:hover {
            border-color: rgba(0, 242, 169, 0.4);
            transform: translateY(-4px);
        }

        /* 手风琴折叠过渡 */
        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.25s ease;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .faq-item.active .faq-content {
            max-height: 300px;
            opacity: 1;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }