/* roulang page: index */
:root {
            --primary: #7C3AED;
            --primary-glow: rgba(124, 58, 237, 0.5);
            --accent: #14F195;
            --accent-glow: rgba(20, 241, 149, 0.4);
            --bg-deep: #0C0C0F;
            --bg-card: #1A1A20;
            --bg-container: #272730;
            --gold: #F59E0B;
            --text-main: #E1E1E6;
            --text-sub: #A0A0B0;
            --text-high: #FFFFFF;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-tag: 6px;
            --font-mono: 'SF Mono', 'Roboto Mono', 'Consolas', monospace;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.45);
            --shadow-accent: 0 0 20px rgba(20, 241, 149, 0.35);
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-deep);
            color: var(--text-main);
            line-height: 1.75;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea,
            select {
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
        }

        /* 导航 */
        #main-nav {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 100;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            background: rgba(10, 10, 15, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 40px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
            transition: all 0.3s ease;
        }
        #main-nav .logo-link {
            font-weight: 700;
            font-size: 1.15rem;
            letter-spacing: 0.03em;
            color: #FFFFFF;
            white-space: nowrap;
            margin-right: 12px;
            position: relative;
        }
        #main-nav .logo-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
            box-shadow: 0 0 8px var(--accent-glow);
        }
        #main-nav .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-sub);
            padding: 8px 14px;
            border-radius: 20px;
            transition: all 0.25s ease;
            white-space: nowrap;
            position: relative;
        }
        #main-nav .nav-link:hover,
        #main-nav .nav-link.active {
            color: #FFFFFF;
        }
        #main-nav .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 18px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
            box-shadow: 0 0 10px var(--accent-glow);
        }
        #mobile-nav-trigger {
            display: none;
            position: fixed;
            bottom: 28px;
            right: 20px;
            z-index: 110;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 0 0 24px rgba(124, 58, 237, 0.6);
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            transition: all 0.3s ease;
        }
        #mobile-nav-drawer {
            display: none;
            position: fixed;
            bottom: 96px;
            right: 20px;
            z-index: 109;
            flex-direction: column;
            gap: 6px;
            background: rgba(10, 10, 15, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 20px;
            padding: 12px 8px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
        }
        #mobile-nav-drawer .nav-link {
            padding: 10px 20px;
            border-radius: 14px;
            font-weight: 500;
            color: var(--text-sub);
            white-space: nowrap;
            transition: all 0.25s ease;
        }
        #mobile-nav-drawer .nav-link:hover,
        #mobile-nav-drawer .nav-link.active {
            background: rgba(124, 58, 237, 0.2);
            color: #fff;
        }
        @media (max-width: 860px) {
            #main-nav {
                display: none;
            }
            #mobile-nav-trigger {
                display: flex;
            }
            #mobile-nav-drawer.open {
                display: flex;
            }
            #mobile-nav-drawer {
                display: none;
            }
        }

        /* 板块间距 */
        section {
            padding: 100px 0;
        }
        @media (max-width: 1024px) {
            section {
                padding: 80px 0;
            }
        }
        @media (max-width: 520px) {
            section {
                padding: 64px 0;
            }
        }

        /* Hero */
        #hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            overflow: hidden;
            padding-top: 80px;
            background: var(--bg-deep);
        }
        #hero-canvas {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
        }
        #hero .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        #hero h1 {
            font-size: clamp(44px, 6vw, 68px);
            font-weight: 700;
            letter-spacing: -0.02em;
            color: #FFFFFF;
            line-height: 1.15;
            margin-bottom: 20px;
            text-shadow: 0 0 60px rgba(124, 58, 237, 0.5);
            position: relative;
            display: inline-block;
        }
        #hero h1 .cursor-blink {
            display: inline-block;
            width: 3px;
            height: 1em;
            background: var(--accent);
            margin-left: 4px;
            vertical-align: text-bottom;
            animation: blink 1s step-end infinite;
            box-shadow: 0 0 12px var(--accent-glow);
        }
        @keyframes blink {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0;
            }
        }
        #hero .hero-sub {
            font-size: 1.1rem;
            color: var(--text-sub);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: 36px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: var(--primary);
            color: #FFFFFF;
            font-weight: 600;
            letter-spacing: 0.04em;
            border-radius: var(--radius-btn);
            transition: all 0.25s ease;
            box-shadow: 0 0 20px rgba(124, 58, 237, 0.4);
            font-size: 1rem;
            gap: 8px;
        }
        .btn-primary:hover {
            box-shadow: 0 0 35px rgba(124, 58, 237, 0.7);
            transform: translateY(-2px);
            filter: brightness(1.1);
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: transparent;
            color: #FFFFFF;
            font-weight: 600;
            letter-spacing: 0.04em;
            border-radius: var(--radius-btn);
            border: 1px solid var(--primary);
            transition: all 0.25s ease;
            font-size: 1rem;
            gap: 8px;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            background: rgba(124, 58, 237, 0.12);
            box-shadow: 0 0 20px rgba(20, 241, 149, 0.25);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: scale(0.97);
        }
        #hero .hero-visual {
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 500px;
            margin: 0 auto;
            opacity: 0.85;
        }
        #hero .hero-visual img {
            border-radius: 16px;
            box-shadow: 0 0 60px rgba(124, 58, 237, 0.3);
        }

        /* 卡片 */
        .card-glow {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid #272730;
            padding: 28px 24px;
            transition: all 0.35s ease;
            position: relative;
            overflow: hidden;
        }
        .card-glow::before {
            content: '';
            position: absolute;
            top: -1px;
            left: -1px;
            right: -1px;
            bottom: -1px;
            border-radius: var(--radius-card);
            border: 1px solid transparent;
            transition: border-color 0.35s ease;
            pointer-events: none;
            z-index: 1;
        }
        .card-glow:hover::before {
            border-color: var(--primary);
            box-shadow: 0 0 28px rgba(124, 58, 237, 0.45);
        }
        .card-glow:hover {
            transform: translateY(-4px);
            box-shadow: 0 0 40px rgba(124, 58, 237, 0.35);
        }
        .card-glow .card-icon {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 16px;
            display: inline-block;
        }
        .card-glow h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .card-glow p {
            font-size: 0.95rem;
            color: var(--text-sub);
            line-height: 1.65;
        }
        .card-glow .card-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: var(--radius-tag);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            background: rgba(124, 58, 237, 0.2);
            color: var(--accent);
            margin-top: 12px;
        }

        /* 场景卡片 */
        .scenario-card {
            display: flex;
            gap: 24px;
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid #272730;
            padding: 20px;
            transition: all 0.35s ease;
            align-items: center;
        }
        .scenario-card:hover {
            border-color: var(--primary);
            box-shadow: 0 0 30px rgba(124, 58, 237, 0.4);
            transform: translateY(-3px);
        }
        .scenario-card img {
            width: 140px;
            height: 100px;
            object-fit: cover;
            border-radius: 10px;
            flex-shrink: 0;
        }
        .scenario-card .scenario-info h3 {
            font-weight: 700;
            color: #FFFFFF;
            font-size: 1.15rem;
            margin-bottom: 6px;
        }
        .scenario-card .scenario-info ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .scenario-card .scenario-info ul li {
            padding-left: 16px;
            position: relative;
            color: var(--text-sub);
            font-size: 0.9rem;
            margin-bottom: 4px;
        }
        .scenario-card .scenario-info ul li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            width: 8px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
            box-shadow: 0 0 6px var(--accent-glow);
        }
        @media (max-width: 640px) {
            .scenario-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .scenario-card img {
                width: 100%;
                height: 160px;
            }
        }

        /* 案例数据卡 */
        .case-stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid #272730;
            padding: 28px 20px;
            text-align: center;
            transition: all 0.35s ease;
        }
        .case-stat-card:hover {
            border-color: var(--primary);
            box-shadow: 0 0 30px rgba(124, 58, 237, 0.45);
            transform: translateY(-4px);
        }
        .case-stat-card .stat-number {
            font-family: var(--font-mono);
            font-size: 2.6rem;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: -0.02em;
            text-shadow: 0 0 20px var(--accent-glow);
        }
        .case-stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-sub);
            margin-top: 6px;
        }

        /* 价格卡片 */
        .pricing-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid #272730;
            padding: 36px 28px;
            transition: all 0.35s ease;
            position: relative;
            display: flex;
            flex-direction: column;
        }
        .pricing-card.featured {
            border-color: var(--primary);
            box-shadow: 0 0 40px rgba(124, 58, 237, 0.4);
            transform: scale(1.03);
        }
        .pricing-card:hover {
            border-color: var(--primary);
            box-shadow: 0 0 35px rgba(124, 58, 237, 0.5);
            transform: translateY(-4px);
        }
        .pricing-card.featured:hover {
            transform: scale(1.03) translateY(-4px);
        }
        .pricing-card .pricing-badge {
            position: absolute;
            top: -12px;
            right: 20px;
            background: var(--gold);
            color: #0C0C0F;
            font-weight: 700;
            font-size: 0.8rem;
            padding: 5px 14px;
            border-radius: 20px;
            letter-spacing: 0.03em;
        }
        .pricing-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 8px;
        }
        .pricing-card .price {
            font-family: var(--font-mono);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent);
            margin: 16px 0;
            text-shadow: 0 0 16px var(--accent-glow);
        }
        .pricing-card ul {
            list-style: none;
            padding: 0;
            margin: 0 0 24px;
            flex: 1;
        }
        .pricing-card ul li {
            padding: 6px 0;
            color: var(--text-sub);
            font-size: 0.9rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        /* FAQ */
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid #272730;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .faq-item.open {
            border-color: var(--primary);
            box-shadow: 0 0 20px rgba(124, 58, 237, 0.3);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            color: #FFFFFF;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: color 0.25s ease;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-arrow {
            font-size: 1.2rem;
            transition: transform 0.35s ease;
            color: var(--accent);
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-sub);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* 表单 */
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 14px 18px;
            background: var(--bg-card);
            border: 1px solid #272730;
            border-radius: var(--radius-btn);
            color: #FFFFFF;
            font-size: 0.95rem;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 16px rgba(124, 58, 237, 0.3);
            outline: none;
        }
        .contact-form textarea {
            resize: vertical;
            min-height: 120px;
        }

        /* 页脚 */
        footer {
            background: #0A0A0D;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 60px 0 30px;
        }
        footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        @media (max-width: 768px) {
            footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            footer .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        footer h4 {
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
            font-size: 1rem;
        }
        footer a {
            color: var(--text-sub);
            font-size: 0.9rem;
            transition: color 0.25s;
        }
        footer a:hover {
            color: var(--accent);
        }

        /* 响应式辅助 */
        @media (max-width: 1024px) {
            #hero h1 {
                font-size: clamp(36px, 5vw, 52px);
            }
            .pricing-card.featured {
                transform: none;
            }
            .pricing-card.featured:hover {
                transform: translateY(-4px);
            }
        }
        @media (max-width: 640px) {
            #hero {
                text-align: center;
                min-height: auto;
                padding-top: 100px;
                padding-bottom: 60px;
            }
            #hero .hero-sub {
                margin-left: auto;
                margin-right: auto;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
                margin-bottom: 10px;
            }
        }