/* roulang page: index */
:root {
            --brand-teal-start: #00A884;
            --brand-teal-end: #0A7B83;
            --signal-orange: #FF5C38;
            --bg-page: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-soft: #E2E8F0;
            --radius-box: 1rem;
            --radius-btn: 0.5rem;
            --shadow-card: 0 4px 20px -2px rgba(10, 123, 131, 0.08);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--bg-page);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            -webkit-font-smoothing: antialiased;
        }
        .teal-gradient-bg {
            background: linear-gradient(135deg, var(--brand-teal-start) 0%, var(--brand-teal-end) 100%);
        }
        .teal-gradient-text {
            background: linear-gradient(135deg, #00A884, #0A7B83);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .code-box {
            background: #0B0F19;
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }