/* roulang page: index */
:root {
            --primary: #EA580C;
            --primary-hover: #F97316;
            --secondary: #0F766E;
            --secondary-dark: #115E59;
            --text-title: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-soft: #E2E8F0;
            --bg-canvas: #F8FAFC;
        }
        body {
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
            background-color: var(--bg-canvas);
            color: var(--text-body);
            line-height: 1.75;
            overflow-x: hidden;
        }
        .text-balance {
            text-wrap: balance;
        }
        .shadow-soft {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
        }
        .shadow-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .shadow-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
        }
        .accordion-content {
            transition: max-height 0.35s ease-out, opacity 0.25s ease-in;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.active {
            max-height: 380px;
            opacity: 1;
        }
        .rotate-arrow {
            transition: transform 0.3s ease;
        }
        .rotate-arrow.active {
            transform: rotate(180deg);
        }