/* roulang page: index */
:root {
            --bg-base: #0B0E14;
            --bg-surface: #111622;
            --bg-card: rgba(22, 27, 38, 0.78);
            --bg-card-hover: rgba(29, 36, 51, 0.88);
            --brand-primary: #4F46E5;
            --brand-primary-hover: #4338CA;
            --brand-cyan: #06B6D4;
            --brand-emerald: #10B981;
            --text-main: #FFFFFF;
            --text-secondary: #E2E8F0;
            --text-muted: #94A3B8;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-highlight: rgba(6, 182, 212, 0.35);
            --shadow-glow: 0 12px 30px rgba(79, 70, 229, 0.22);
            --radius-md: 14px;
            --radius-pill: 9999px;
            --nav-utility-h: 36px;
            --nav-main-h: 74px;
        }

        /* 基础重置 */
        *, *::before, *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            padding: 0;
            background-color: var(--bg-base);
            color: var(--text-secondary);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* 文字与排版修饰 */
        h1, h2, h3, h4, h5, h6 {
            color: var(--text-main);
            font-weight: 700;
            line-height: 1.35;
        }
        a {
            text-decoration: none;
            transition: all 0.25s ease;
        }
        .text-cyan {
            color: var(--brand-cyan) !important;
        }
        .text-emerald {
            color: var(--brand-emerald) !important;
        }
        .text-gradient {
            background: linear-gradient(135deg, #FFFFFF 20%, var(--brand-cyan) 60%, var(--brand-primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: var(--radius-pill);
            background: rgba(6, 182, 212, 0.12);
            border: 1px solid rgba(6, 182, 212, 0.3);
            color: var(--brand-cyan);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }

        /* 顶部双行透明玻璃导航 */
        .glass-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1050;
            transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
        }
        .utility-bar {
            height: var(--nav-utility-h);
            background: rgba(11, 14, 20, 0.7);
            border-bottom: 1px solid var(--border-subtle);
            font-size: 0.8rem;
            color: var(--text-muted);
            backdrop-filter: blur(10px);
        }
        .main-navbar {
            height: var(--nav-main-h);
            background: rgba(17, 22, 34, 0.7);
            border-bottom: 1px solid var(--border-subtle);
            backdrop-filter: blur(16px);
            transition: padding 0.3s ease;
        }
        .glass-header.scrolled .main-navbar {
            background: rgba(11, 14, 20, 0.96);
            border-bottom-color: rgba(255, 255, 255, 0.12);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
        }
        .brand-logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .brand-logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
        }
        .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 16px !important;
            transition: color 0.2s ease;
        }
        .nav-link:hover {
            color: var(--brand-cyan) !important;
        }
        .btn-gradient {
            background: linear-gradient(135deg, var(--brand-primary), #6366F1);
            color: #FFFFFF !important;
            border: 1px solid rgba(255, 255, 255, 0.15);
            font-weight: 600;
            border-radius: 10px;
            padding: 10px 22px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 18px rgba(79, 70, 229, 0.35);
            transition: all 0.25s ease;
        }
        .btn-gradient:hover {
            background: linear-gradient(135deg, var(--brand-primary-hover), var(--brand-primary));
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(79, 70, 229, 0.55);
        }
        .btn-outline-cyber {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.16);
            color: var(--text-main) !important;
            font-weight: 600;
            border-radius: 10px;
            padding: 10px 22px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.25s ease;
        }
        .btn-outline-cyber:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--brand-cyan);
            color: var(--brand-cyan) !important;
            transform: translateY(-2px);
        }

        /* 卡片与通用组件 */
        .cyber-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px;
            backdrop-filter: blur(16px);
            transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
            position: relative;
            overflow: hidden;
            height: 100%;
        }
        .cyber-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-5px);
            border-color: var(--border-highlight);
            box-shadow: var(--shadow-glow);
        }
        .card-icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: rgba(79, 70, 229, 0.12);
            border: 1px solid rgba(79, 70, 229, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--brand-cyan);
            margin-bottom: 20px;
        }

        /* 板块间隔与交替背景 */
        .site-section {
            padding: 90px 0;
            position: relative;
        }
        .section-alt {
            background-color: var(--bg-surface);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }

        /* 工业参数首屏 Hero */
        .hero-section {
            min-height: 100vh;
            padding-top: calc(var(--nav-utility-h) + var(--nav-main-h) + 60px);
            padding-bottom: 80px;
            background: radial-gradient(circle at 80% 20%, rgba(79, 70, 229, 0.2) 0%, transparent 50%),
                        radial-gradient(circle at 20% 70%, rgba(6, 182, 212, 0.12) 0%, transparent 50%),
                        linear-gradient(rgba(11, 14, 20, 0.85), rgba(11, 14, 20, 0.95)),
                        url('/assets/images/fdbc6c8746b33deb.png') center/cover no-repeat;
            display: flex;
            align-items: center;
            position: relative;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(79, 70, 229, 0.2);
            border: 1px solid rgba(79, 70, 229, 0.4);
            border-radius: var(--radius-pill);
            color: #C7D2FE;
            font-size: 0.85rem;
            margin-bottom: 20px;
        }
        .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--brand-emerald);
            box-shadow: 0 0 10px var(--brand-emerald);
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.4); opacity: 1; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }
        .param-box {
            background: rgba(17, 22, 34, 0.85);
            border: 1px solid rgba(6, 182, 212, 0.25);
            border-radius: 12px;
            padding: 18px 22px;
            margin-bottom: 14px;
            backdrop-filter: blur(12px);
        }
        .param-value {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--brand-cyan);
            line-height: 1.1;
        }

        /* 计数与走势徽章 */
        .stat-badge {
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: var(--radius-pill);
            background: rgba(16, 185, 129, 0.15);
            color: var(--brand-emerald);
            border: 1px solid rgba(16, 185, 129, 0.3);
            font-weight: 600;
        }

        /* 对比表格/卡片 */
        .comparison-panel {
            background: rgba(17, 22, 34, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: 16px;
            overflow: hidden;
        }
        .comp-header {
            padding: 20px;
            border-bottom: 1px solid var(--border-subtle);
            font-weight: 700;
            font-size: 1.1rem;
        }
        .comp-header.highlight {
            background: rgba(79, 70, 229, 0.15);
            border-bottom: 1px solid rgba(79, 70, 229, 0.3);
            color: var(--brand-cyan);
        }
        .comp-item {
            padding: 16px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            font-size: 0.92rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .comp-item:last-child {
            border-bottom: none;
        }

        /* 时间线 */
        .timeline-step {
            position: relative;
            padding-left: 36px;
            margin-bottom: 36px;
        }
        .timeline-step::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 6px;
            bottom: -36px;
            width: 2px;
            background: rgba(79, 70, 229, 0.25);
        }
        .timeline-step:last-child::before {
            display: none;
        }
        .timeline-dot {
            position: absolute;
            left: 0;
            top: 4px;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--bg-surface);
            border: 3px solid var(--brand-cyan);
            box-shadow: 0 0 12px rgba(6, 182, 212, 0.5);
        }

        /* 折叠手风琴覆盖 */
        .accordion-item {
            background: var(--bg-card) !important;
            border: 1px solid var(--border-subtle) !important;
            border-radius: 12px !important;
            margin-bottom: 14px;
            overflow: hidden;
        }
        .accordion-button {
            background: transparent !important;
            color: var(--text-main) !important;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 20px 24px;
            box-shadow: none !important;
        }
        .accordion-button::after {
            filter: invert(1);
        }
        .accordion-button:not(.collapsed) {
            color: var(--brand-cyan) !important;
            border-bottom: 1px solid var(--border-subtle);
        }
        .accordion-body {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
            padding: 22px 24px;
            background: rgba(11, 14, 20, 0.4);
        }

        /* 表单定制 */
        .form-control-cyber, .form-select-cyber {
            background: rgba(11, 14, 20, 0.7);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #FFFFFF;
            border-radius: 10px;
            padding: 14px 18px;
            font-size: 0.95rem;
            transition: all 0.25s ease;
            width: 100%;
        }
        .form-control-cyber:focus, .form-select-cyber:focus {
            background: rgba(11, 14, 20, 0.9);
            border-color: var(--brand-cyan);
            outline: none;
            box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
            color: #FFFFFF;
        }
        .form-select-cyber option {
            background: #111622;
            color: #FFFFFF;
        }

        /* 页脚 */
        .site-footer {
            background: #080A0F;
            border-top: 1px solid var(--border-subtle);
            padding: 80px 0 30px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .footer-heading {
            color: var(--text-main);
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 22px;
            position: relative;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: var(--text-muted);
        }
        .footer-links a:hover {
            color: var(--brand-cyan);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 30px;
            margin-top: 60px;
            font-size: 0.85rem;
        }

        /* 响应式断点控制 */
        @media (max-width: 991.98px) {
            .utility-bar {
                display: none;
            }
            .hero-section {
                padding-top: calc(var(--nav-main-h) + 40px);
                min-height: auto;
            }
            .site-section {
                padding: 60px 0;
            }
        }
        @media (max-width: 575.98px) {
            .hero-title {
                font-size: 2rem !important;
            }
            .cyber-card {
                padding: 20px;
            }
        }