/* roulang page: index */
:root {
            --bg-deep: #050510;
            --bg-card: rgba(255, 255, 255, 0.05);
            --blur-glass: blur(20px);
            --border-light: rgba(255, 255, 255, 0.12);
            --border-hover: rgba(255, 255, 255, 0.25);
            --primary-gradient: linear-gradient(135deg, #7B2FBE 0%, #00D2FF 100%);
            --cta-glow: 0 0 20px rgba(0, 210, 255, 0.6);
            --cta-glow-hover: 0 0 32px rgba(0, 210, 255, 0.9);
            --text-white: #FFFFFF;
            --text-light: #B0C4DE;
            --text-muted: #7A8BA0;
            --accent-green: #00E676;
            --accent-red: #FF5252;
            --cta-warm: #FFD740;
            --radius-lg: 16px;
            --radius-pill: 50px;
            --shadow-card: 0 8px 32px rgba(123, 47, 190, 0.3);
            --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
            --font-stack: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --nav-height: 72px;
        }

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

        html {
            scroll-behavior: smooth;
            background-color: var(--bg-deep);
        }

        body {
            font-family: var(--font-stack);
            background: var(--bg-deep);
            color: var(--text-light);
            line-height: 1.7;
            font-size: 16px;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }

        button {
            font-family: var(--font-stack);
            cursor: pointer;
            border: none;
            background: none;
        }

        h1, h2, h3 {
            font-weight: 600;
            letter-spacing: -0.3px;
            color: var(--text-white);
        }

        h1 {
            font-size: 42px;
            font-weight: 700;
            letter-spacing: -0.5px;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        h2 {
            font-size: 32px;
            margin-bottom: 16px;
            position: relative;
            display: inline-block;
        }

        h2::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -8px;
            width: 60%;
            height: 3px;
            background: var(--primary-gradient);
            border-radius: 2px;
            opacity: 0.7;
        }

        h3 {
            font-size: 20px;
            margin-bottom: 8px;
            color: var(--text-white);
        }

        .section {
            padding: 120px 0;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 28px;
            }
            h2 {
                font-size: 26px;
            }
            h3 {
                font-size: 18px;
            }
            .section {
                padding: 80px 0;
            }
        }

        /* 导航 */
        .nav {
            position: sticky;
            top: 0;
            z-index: 100;
            height: var(--nav-height);
            background: rgba(5, 5, 16, 0.7);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
        }

        .nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-white);
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: 0.5px;
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary-gradient);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: white;
        }

        .nav-menu {
            display: flex;
            gap: 32px;
            align-items: center;
            list-style: none;
        }

        .nav-menu a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            padding: 8px 0;
            position: relative;
        }

        .nav-menu a:hover {
            color: #00D2FF;
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #00D2FF;
            transition: var(--transition-smooth);
        }

        .nav-menu a:hover::after {
            width: 100%;
        }

        .nav-cta {
            background: var(--primary-gradient);
            color: white;
            padding: 10px 24px;
            border-radius: var(--radius-pill);
            font-weight: 700;
            font-size: 15px;
            box-shadow: var(--cta-glow);
            transition: var(--transition-smooth);
        }

        .nav-cta:hover {
            box-shadow: var(--cta-glow-hover);
            transform: translateY(-1px);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
        }

        .hamburger span {
            width: 28px;
            height: 3px;
            background: white;
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 0;
                right: -100%;
                width: 100%;
                height: 100vh;
                background: rgba(5, 5, 16, 0.95);
                backdrop-filter: blur(30px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 32px;
                transition: var(--transition-smooth);
                z-index: 99;
            }
            .nav-menu.active {
                right: 0;
            }
            .hamburger {
                display: flex;
                z-index: 101;
            }
            .close-btn {
                position: absolute;
                top: 24px;
                right: 24px;
                font-size: 32px;
                color: white;
                z-index: 102;
                display: none;
            }
            .nav-menu.active ~ .close-btn {
                display: block;
            }
            .nav-cta {
                display: none;
            }
        }

        /* Hero */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            background: radial-gradient(ellipse at center, #1a1030 0%, #050510 70%);
            position: relative;
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.4;
            z-index: 0;
        }

        .particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            width: 100%;
        }

        .hero-text {
            flex: 1 1 400px;
        }

        .hero-subtitle {
            font-size: 18px;
            color: var(--text-light);
            margin: 24px 0 36px;
            max-width: 500px;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            background: var(--primary-gradient);
            color: white;
            padding: 14px 36px;
            border-radius: var(--radius-pill);
            font-weight: 700;
            font-size: 18px;
            box-shadow: var(--cta-glow);
            transition: var(--transition-smooth);
            text-align: center;
        }

        .btn-primary:hover {
            box-shadow: var(--cta-glow-hover);
            transform: scale(1.03);
        }

        .btn-secondary {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.3);
            color: white;
            padding: 14px 36px;
            border-radius: var(--radius-pill);
            font-weight: 600;
            font-size: 18px;
            backdrop-filter: blur(10px);
            transition: var(--transition-smooth);
        }

        .btn-secondary:hover {
            border-color: white;
            background: rgba(255, 255, 255, 0.08);
        }

        .login-demo-card {
            flex: 0 0 360px;
            background: var(--bg-card);
            backdrop-filter: var(--blur-glass);
            border-radius: 24px;
            border: 1px solid var(--border-light);
            padding: 32px;
            box-shadow: var(--shadow-card);
        }

        .demo-input {
            width: 100%;
            padding: 12px 16px;
            margin-bottom: 16px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 12px;
            color: white;
            font-size: 16px;
            outline: none;
        }

        .demo-btn {
            width: 100%;
            background: var(--primary-gradient);
            color: white;
            padding: 14px;
            border-radius: 12px;
            font-weight: 700;
            box-shadow: var(--cta-glow);
        }

        @media (max-width: 768px) {
            .hero-content {
                flex-direction: column;
            }
            .login-demo-card {
                flex: 1 1 auto;
                width: 100%;
                max-width: 400px;
            }
        }

        /* 通用卡片网格 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .card {
            background: var(--bg-card);
            backdrop-filter: var(--blur-glass);
            border-radius: var(--radius-lg);
            padding: 32px;
            border: 1px solid var(--border-light);
            transition: var(--transition-smooth);
        }

        .card:hover {
            transform: translateY(-6px);
            border-color: var(--border-hover);
            box-shadow: var(--shadow-card);
        }

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            margin-bottom: 20px;
        }

        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 520px) {
            .grid-3 {
                grid-template-columns: 1fr;
            }
        }

        /* 痛点卡片特殊样式 */
        .pain-card {
            border-left: 4px solid var(--accent-red);
        }

        /* 方案卡片 */
        .solution-card {
            border-color: rgba(0, 210, 255, 0.2);
        }

        .solution-card:hover {
            border-color: rgba(0, 210, 255, 0.7);
        }

        /* 数据面板 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            text-align: center;
        }

        .stat-number {
            font-size: 56px;
            font-weight: 700;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 证言卡片 */
        .testimonial-card {
            position: relative;
        }

        .testimonial-quote {
            font-size: 60px;
            color: rgba(255, 255, 255, 0.1);
            position: absolute;
            top: 10px;
            left: 20px;
        }

        .avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: gray;
            margin-right: 12px;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 16px 0;
            cursor: pointer;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: white;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            color: var(--text-muted);
        }

        .faq-answer.open {
            max-height: 200px;
            padding-top: 12px;
        }

        /* CTA 区 */
        .cta-section {
            background: radial-gradient(circle at center, #1e1345 0%, #050510 80%);
        }

        /* 页脚 */
        .footer {
            background: #030310;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 60px 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

@keyframes pulse {
            0% { box-shadow: 0 0 20px rgba(0,210,255,0.6); }
            50% { box-shadow: 0 0 40px rgba(123,47,190,0.9); }
            100% { box-shadow: 0 0 20px rgba(0,210,255,0.6); }
        }