/* roulang page: index */
:root {
            --color-silicon: #0B0F12;
            --color-phosphor: #00D492;
            --color-phosphor-hover: #00B37A;
            --color-dark-bg: #0D1117;
            --color-border: #E2E8F0;
            --color-dark-border: #2D3748;
            --color-text-main: #1E293B;
            --color-text-muted: #64748B;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: var(--color-text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        /* 斜切装饰 */
        .hero-diagonal {
            clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
        }

        .hero-diagonal-overlay {
            clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
        }

        /* 工业工程细边框与阴影 */
        .chip-card {
            background: #FFFFFF;
            border: 1px solid var(--color-border);
            border-radius: 6px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 4px 12px rgba(0,0,0,0.03);
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }

        .chip-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0,0,0,0.08);
            border-color: #CBD5E1;
        }

        .chip-card-dark {
            background: #161B22;
            border: 1px solid var(--color-dark-border);
            border-radius: 6px;
            transition: transform 0.2s ease, border-color 0.2s ease;
        }

        .chip-card-dark:hover {
            transform: translateY(-2px);
            border-color: var(--color-phosphor);
        }

        /* 按钮工程系统 */
        .btn-phosphor {
            background-color: var(--color-phosphor);
            color: #0B0F12;
            font-weight: 600;
            border-radius: 4px;
            padding: 10px 24px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
            text-decoration: none;
            border: 1px solid var(--color-phosphor);
            min-height: 44px;
        }

        .btn-phosphor:hover {
            background-color: var(--color-phosphor-hover);
            border-color: var(--color-phosphor-hover);
            color: #000000;
        }

        .btn-outline {
            border: 1px solid #CBD5E1;
            background: #FFFFFF;
            color: #334155;
            font-weight: 600;
            border-radius: 4px;
            padding: 10px 24px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
            text-decoration: none;
            min-height: 44px;
        }

        .btn-outline:hover {
            border-color: var(--color-phosphor);
            color: var(--color-silicon);
            background-color: #F8FAFC;
        }

        /* 手风琴原生定制 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }

        /* 输入框交互 */
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--color-phosphor) !important;
            box-shadow: 0 0 0 2px rgba(0, 212, 146, 0.2);
        }

        html {
            scroll-behavior: smooth;
        }