/* roulang page: index */
:root {
            --color-bg-base: #F8FAFC;
            --color-surface: #FFFFFF;
            --color-text-main: #0A181C;
            --color-text-body: #334155;
            --color-text-muted: #64748B;
            --color-border: #E2E8F0;
            --color-primary: #0D9488;
            --color-accent: #10B981;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 36, 42, 0.05);
            --shadow-lifted: 0 12px 30px -4px rgba(15, 36, 42, 0.12);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            background-color: var(--color-bg-base);
            color: var(--color-text-body);
            line-height: 1.8;
            overflow-x: hidden;
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
        }

        .hero-mesh {
            background-color: #0F242A;
            background-image: 
                radial-gradient(at 10% 20%, rgba(13, 148, 136, 0.28) 0px, transparent 50%),
                radial-gradient(at 90% 80%, rgba(16, 185, 129, 0.2) 0px, transparent 50%),
                radial-gradient(at 50% 50%, rgba(15, 36, 42, 0.8) 0px, transparent 100%);
        }

        .dark-mesh {
            background: linear-gradient(180deg, #091316 0%, #0c1a1e 100%);
            background-image: radial-gradient(circle at 50% 0%, rgba(13, 148, 136, 0.18) 0%, transparent 75%);
        }

        .card-neo {
            background: #FFFFFF;
            border: 1px solid var(--color-border);
            border-radius: 1rem;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-neo:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lifted);
            border-color: rgba(13, 148, 136, 0.4);
        }

        .glass-panel {
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .terminal-code {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
        }

        /* FAQ Accordion Transition */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.3s ease;
        }
        .faq-item.active .faq-answer {
            max-height: 280px;
            padding-top: 1rem;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        /* Quick Answers Tabs */
        .tab-btn.active {
            background-color: #0D9488;
            color: #FFFFFF;
            border-color: #0D9488;
        }

        /* Custom Scrollbar for Terminals */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 3px;
        }