/* roulang page: index */
:root {
            --primary-bg: #0B132B;
            --secondary-bg: #1C2541;
            --accent-gradient: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            --card-radius: 20px;
        }
        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: #F8FAFC;
            color: #1E293B;
            overflow-x: hidden;
        }
        .gradient-brand {
            background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
        }
        .text-gradient {
            background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .custom-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
        }
        .hover-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border-radius: var(--card-radius);
            border: 1px solid rgba(226, 232, 240, 0.8);
        }
        .hover-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(79, 70, 229, 0.1), 0 8px 10px -6px rgba(79, 70, 229, 0.05);
        }
        .step-active {
            color: #4F46E5;
            border-bottom: 2px solid #4F46E5;
        }
        /* Mobile tap target */
        a, button, input, select {
            min-height: 44px;
            min-width: 44px;
        }