/* roulang page: index */
:root {
            --brand-primary: #1d63ed;
            --brand-dark: #0f172a;
            --brand-light: #f8fafc;
            --brand-border: #e2e8f0;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-card: 0 10px 25px -5px rgba(29, 99, 237, 0.07), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #f8fafc;
            color: #1e293b;
        }
        .tool-nav {
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--brand-border);
        }
        .tea-card-hover {
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .tea-card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(29, 99, 237, 0.12);
        }