/* roulang page: index */
:root {
            --primary-500: #00E5A0;
            --primary-600: #00C58A;
            --primary-gradient: linear-gradient(135deg, #00E5A0 0%, #8A3FFF 100%);
            --accent-500: #FF6B3D;
            --accent-400: #FF8A62;
            --bg-deep: #0A0E17;
            --bg-surface: #131A26;
            --bg-elevated: #1B2332;
            --bg-muted: #202B3A;
            --text-primary: #FFFFFF;
            --text-secondary: #B0C0D0;
            --text-muted: #6A7A8C;
            --success: #00E5A0;
            --warning: #F5B042;
            --error: #FF4D6A;
            --badge-glow: rgba(0, 229, 160, 0.25);
            --badge-border: rgba(0, 229, 160, 0.35);
            --radius-card: 24px;
            --radius-button: 42px;
            --radius-badge: 16px;
            --radius-input: 20px;
            --shadow-card: 0 0 0 1px rgba(255, 255, 255, 0.05), 0 8px 32px rgba(0, 0, 0, 0.45);
            --shadow-elevated: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 16px 48px rgba(0, 0, 0, 0.6);
            --shadow-glow-primary: 0 0 20px rgba(0, 229, 160, 0.3), 0 8px 30px rgba(0, 229, 160, 0.15);
            --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
            --duration-fast: 180ms;
            --duration-normal: 280ms;
            --section-gap: 120px;
            --card-gap: 28px;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 90px;
        }

        body {
            margin: 0;
            padding: 0;
            background-color: var(--bg-deep);
            color: var(--text-primary);
            font-family: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--duration-fast) var(--ease-out-expo);
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        @media (max-width: 768px) {
            .container-custom {
                padding: 0 20px;
            }
        }

        /* 导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 72px;
            background: rgba(10, 14, 23, 0.82);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--duration-normal) var(--ease-out-expo);
        }

        .site-header.scrolled {
            background: rgba(10, 14, 23, 0.95);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        @media (max-width: 768px) {
            .header-inner {
                padding: 0 20px;
            }
        }

        .logo-text {
            font-family: 'Montserrat', 'Inter', 'Noto Sans SC', sans-serif;
            font-weight: 800;
            font-size: 1.5rem;
            letter-spacing: -0.3px;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            font-size: 0.875rem;
            font-weight: 500;
            letter-spacing: 0.5px;
            color: var(--text-secondary);
            position: relative;
            padding: 4px 0;
            transition: color var(--duration-fast) var(--ease-out-expo);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-500);
            border-radius: 1px;
            transition: width var(--duration-normal) var(--ease-out-expo);
        }

        .nav-links a:hover {
            color: var(--primary-500);
        }
        .nav-links a:hover::after {
            width: 100%;
        }

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent-500);
            color: #fff;
            font-size: 0.8125rem;
            font-weight: 600;
            padding: 9px 20px;
            border-radius: 24px;
            letter-spacing: 0.4px;
            transition: all var(--duration-normal) var(--ease-out-expo);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-cta-btn:hover {
            background: var(--accent-400);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(255, 107, 61, 0.35);
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1100;
            padding: 8px;
            background: none;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--duration-normal) var(--ease-out-expo);
            transform-origin: center;
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                width: 80%;
                max-width: 380px;
                height: 100vh;
                background: var(--bg-deep);
                flex-direction: column;
                align-items: flex-start;
                padding: 100px 40px 40px;
                gap: 20px;
                transition: right var(--duration-normal) var(--ease-out-expo);
                box-shadow: -8px 0 40px rgba(0, 0, 0, 0.6);
                border-left: 1px solid rgba(255, 255, 255, 0.05);
                z-index: 1050;
            }
            .nav-links.open {
                right: 0;
            }
            .nav-links a {
                font-size: 1.1rem;
                font-weight: 500;
            }
            .hamburger {
                display: flex;
            }
            .nav-cta-btn {
                margin-top: 12px;
                padding: 11px 24px;
                font-size: 0.9rem;
            }
        }

        /* 移动端遮罩 */
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 1040;
        }
        .nav-overlay.active {
            display: block;
        }

        @media (min-width: 769px) {
            .nav-overlay {
                display: none !important;
            }
        }

        /* 区块间距 */
        .section {
            padding: var(--section-gap) 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 70px 0;
            }
        }

        /* Hero */
        .hero-section {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: 72px;
            position: relative;
            overflow: hidden;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 48% 52%;
            gap: 40px;
            align-items: center;
            width: 100%;
        }
        @media (max-width: 768px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 0;
                text-align: center;
            }
        }
        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 420px;
        }
        @media (max-width: 768px) {
            .hero-visual {
                min-height: 280px;
                order: -1;
                margin-bottom: 20px;
            }
        }
        @media (max-width: 480px) {
            .hero-visual {
                min-height: 220px;
            }
        }

        /* 动态球体 */
        .orb {
            position: absolute;
            border-radius: 50%;
            filter: blur(40px);
            animation: floatOrb 8s ease-in-out infinite;
            pointer-events: none;
        }
        .orb-1 {
            width: 180px;
            height: 180px;
            background: radial-gradient(circle, rgba(0, 229, 160, 0.5) 0%, rgba(138, 63, 255, 0.3) 60%, transparent 100%);
            top: 10%;
            right: 15%;
            animation-delay: 0s;
        }
        .orb-2 {
            width: 140px;
            height: 140px;
            background: radial-gradient(circle, rgba(138, 63, 255, 0.45) 0%, rgba(0, 229, 160, 0.25) 55%, transparent 100%);
            top: 40%;
            right: 35%;
            animation-delay: -3s;
        }
        .orb-3 {
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(255, 107, 61, 0.35) 0%, rgba(0, 229, 160, 0.3) 50%, transparent 100%);
            top: 25%;
            right: 8%;
            animation-delay: -5.5s;
        }
        @media (max-width: 768px) {
            .orb-1 {
                width: 120px;
                height: 120px;
                top: 5%;
                right: 20%;
            }
            .orb-2 {
                width: 100px;
                height: 100px;
                top: 35%;
                right: 40%;
            }
            .orb-3 {
                width: 140px;
                height: 140px;
                top: 15%;
                right: 5%;
            }
        }

        @keyframes floatOrb {
            0%,
            100% {
                transform: translate(0, 0) scale(1);
            }
            25% {
                transform: translate(18px, -22px) scale(1.06);
            }
            50% {
                transform: translate(-10px, -8px) scale(0.94);
            }
            75% {
                transform: translate(-16px, 18px) scale(1.04);
            }
        }

        /* 浮动徽章 */
        .floating-badge {
            position: absolute;
            background: rgba(0, 229, 160, 0.08);
            border: 1px solid var(--badge-border);
            border-radius: var(--radius-badge);
            padding: 8px 16px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--primary-500);
            white-space: nowrap;
            pointer-events: none;
            animation: floatBadge 6s ease-in-out infinite;
            font-family: 'Montserrat', 'Inter', 'Noto Sans SC', sans-serif;
            box-shadow: var(--badge-glow);
        }
        .floating-badge.b1 {
            top: 18%;
            right: 55%;
            animation-delay: 0s;
        }
        .floating-badge.b2 {
            top: 52%;
            right: 12%;
            animation-delay: -2s;
        }
        .floating-badge.b3 {
            top: 68%;
            right: 40%;
            animation-delay: -4s;
        }
        @media (max-width: 768px) {
            .floating-badge.b1 {
                top: 10%;
                right: 50%;
            }
            .floating-badge.b2 {
                top: 45%;
                right: 5%;
            }
            .floating-badge.b3 {
                top: 70%;
                right: 30%;
            }
            .floating-badge {
                font-size: 0.7rem;
                padding: 6px 12px;
            }
        }

        @keyframes floatBadge {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-12px);
            }
        }

        /* 标题渐变 */
        .gradient-text {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .gradient-text-h2 {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }

        /* 卡片 */
        .card-feature {
            background: var(--bg-surface);
            border-radius: var(--radius-card);
            padding: 28px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
            transition: all var(--duration-normal) var(--ease-out-expo);
            cursor: default;
        }
        .card-feature::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 0%;
            height: 3px;
            background: var(--primary-gradient);
            border-radius: 0 0 3px 0;
            transition: width var(--duration-normal) var(--ease-out-expo);
            z-index: 2;
        }
        .card-feature:hover {
            transform: translateY(-6px) scale(1.02);
            box-shadow: var(--shadow-glow-primary), var(--shadow-elevated);
            border-color: rgba(0, 229, 160, 0.2);
        }
        .card-feature:hover::before {
            width: 100%;
        }
        .card-feature .arrow-link {
            opacity: 0;
            transform: translateX(-8px);
            transition: all var(--duration-normal) var(--ease-out-expo);
            color: var(--primary-500);
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 8px;
        }
        .card-feature:hover .arrow-link {
            opacity: 1;
            transform: translateX(0);
        }

        .card-feature.tall-card {
            grid-row: span 2;
        }

        @media (max-width: 768px) {
            .card-feature {
                padding: 22px;
                border-radius: 20px;
            }
            .card-feature.tall-card {
                grid-row: span 1;
            }
        }

        /* 场景卡 */
        .usecase-card {
            position: relative;
            border-radius: 28px;
            overflow: hidden;
            height: 380px;
            cursor: pointer;
            transition: all var(--duration-normal) var(--ease-out-expo);
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .usecase-card:hover {
            transform: scale(1.02);
            box-shadow: var(--shadow-glow-primary);
            border-color: rgba(0, 229, 160, 0.25);
        }
        .usecase-card .usecase-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            transition: transform var(--duration-normal) var(--ease-out-expo);
        }
        .usecase-card:hover .usecase-bg {
            transform: scale(1.06);
        }
        .usecase-card .usecase-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10, 14, 23, 0.92) 0%, rgba(10, 14, 23, 0.35) 50%, rgba(10, 14, 23, 0.15) 100%);
            z-index: 2;
        }
        .usecase-card .usecase-content {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 3;
            padding: 32px 28px;
        }
        @media (max-width: 768px) {
            .usecase-card {
                height: 300px;
                border-radius: 22px;
            }
            .usecase-card .usecase-content {
                padding: 24px 20px;
            }
        }

        /* 案例面板 */
        .case-panel {
            background: var(--bg-elevated);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: all var(--duration-normal) var(--ease-out-expo);
            text-align: center;
            cursor: default;
        }
        .case-panel:hover {
            background: var(--bg-muted);
            box-shadow: var(--shadow-glow-primary);
            transform: translateY(-4px);
        }
        .case-panel .case-number {
            font-family: 'Montserrat', 'Inter', 'Noto Sans SC', sans-serif;
            font-weight: 800;
            font-size: 4.75rem;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1;
            transition: filter var(--duration-normal) var(--ease-out-expo);
        }
        .case-panel:hover .case-number {
            filter: brightness(1.3);
        }
        @media (max-width: 768px) {
            .case-panel .case-number {
                font-size: 3.5rem;
            }
            .case-panel {
                padding: 24px 18px;
                border-radius: 20px;
            }
        }

        /* 价格卡 */
        .pricing-card {
            background: var(--bg-surface);
            border-radius: var(--radius-card);
            padding: 36px 28px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            box-shadow: var(--shadow-card);
            transition: all var(--duration-normal) var(--ease-out-expo);
            text-align: center;
            position: relative;
            display: flex;
            flex-direction: column;
            gap: 18px;
        }
        .pricing-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-elevated);
        }
        .pricing-card.featured {
            background: var(--bg-elevated);
            border: 1px solid transparent;
            box-shadow: var(--shadow-glow-primary), var(--shadow-elevated);
            position: relative;
            z-index: 2;
        }
        .pricing-card.featured::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: calc(var(--radius-card) + 2px);
            background: var(--primary-gradient);
            z-index: -1;
            opacity: 0.5;
            pointer-events: none;
        }
        .pricing-badge-popular {
            display: inline-block;
            background: var(--accent-500);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 5px 14px;
            border-radius: 20px;
            letter-spacing: 0.5px;
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            white-space: nowrap;
        }
        @media (max-width: 768px) {
            .pricing-card {
                padding: 28px 20px;
                border-radius: 20px;
            }
            .pricing-card.featured {
                border-top: 3px solid var(--primary-500);
                box-shadow: var(--shadow-card);
            }
            .pricing-card.featured::before {
                display: none;
            }
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            padding: 18px 0;
            cursor: pointer;
            transition: all var(--duration-fast) var(--ease-out-expo);
        }
        .faq-item.active {
            background: var(--bg-elevated);
            margin: 0 -20px;
            padding: 18px 20px;
            border-radius: 12px;
            border-bottom: none;
            border-left: 4px solid var(--primary-500);
        }
        @media (max-width: 768px) {
            .faq-item.active {
                margin: 0 -12px;
                padding: 16px 12px;
            }
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.05rem;
            gap: 16px;
            user-select: none;
        }
        .faq-item.active .faq-question {
            color: var(--primary-500);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            transition: transform var(--duration-normal) var(--ease-out-expo);
            color: var(--text-muted);
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            color: var(--primary-500);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s var(--ease-out-expo), padding-top 0.3s var(--ease-out-expo);
            color: var(--text-secondary);
            line-height: 1.65;
            padding-top: 0;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-top: 12px;
        }

        /* CTA区 */
        .cta-section {
            background: var(--bg-elevated);
            border-top: 1px solid rgba(0, 229, 160, 0.15);
            text-align: center;
        }

        /* 页脚 */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            padding: 28px 0;
            text-align: center;
        }
        .site-footer a {
            color: var(--text-muted);
            font-size: 0.85rem;
            transition: color var(--duration-fast);
        }
        .site-footer a:hover {
            color: #fff;
        }

        /* 输入框 */
        .input-field {
            background: var(--bg-muted);
            border: none;
            border-radius: var(--radius-input);
            padding: 14px 20px;
            color: #fff;
            font-size: 1rem;
            outline: none;
            transition: all var(--duration-fast);
            width: 100%;
            border: 2px solid transparent;
        }
        .input-field::placeholder {
            color: var(--text-muted);
        }
        .input-field:focus {
            border-color: var(--primary-500);
            box-shadow: 0 0 0 4px rgba(0, 229, 160, 0.08);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--primary-gradient);
            color: #0A0E17;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: var(--radius-button);
            border: none;
            transition: all var(--duration-normal) var(--ease-out-expo);
            letter-spacing: 0.3px;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow-primary);
            filter: brightness(1.08);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: var(--radius-button);
            border: 2px solid rgba(255, 255, 255, 0.25);
            transition: all var(--duration-normal) var(--ease-out-expo);
            letter-spacing: 0.3px;
            cursor: pointer;
        }
        .btn-ghost:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.04);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--accent-500);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: var(--radius-button);
            border: none;
            transition: all var(--duration-normal) var(--ease-out-expo);
            letter-spacing: 0.3px;
            cursor: pointer;
        }
        .btn-accent:hover {
            background: var(--accent-400);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(255, 107, 61, 0.4);
        }

        @media (max-width: 640px) {
            .btn-primary,
            .btn-ghost,
            .btn-accent {
                padding: 12px 24px;
                font-size: 0.9rem;
                border-radius: 32px;
            }
        }

        /* 徽章组件 */
        .badge-glow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(0, 229, 160, 0.08);
            border: 1px solid var(--badge-border);
            border-radius: var(--radius-badge);
            padding: 8px 16px;
            font-size: 0.875rem;
            color: var(--primary-500);
            font-weight: 500;
            transition: all var(--duration-fast);
        }
        .badge-glow:hover {
            border-color: rgba(0, 229, 160, 0.55);
            background: rgba(0, 229, 160, 0.14);
        }
        .badge-glow .badge-num {
            font-weight: 700;
            font-family: 'Montserrat', 'Inter', 'Noto Sans SC', sans-serif;
        }

        .badge-accent {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: rgba(255, 107, 61, 0.1);
            border: 1px solid rgba(255, 107, 61, 0.3);
            border-radius: var(--radius-badge);
            padding: 5px 12px;
            font-size: 0.75rem;
            color: var(--accent-500);
            font-weight: 600;
        }

        /* section标题下划线 */
        .section-underline {
            display: inline-block;
            width: 48px;
            height: 4px;
            border-radius: 2px;
            background: var(--primary-gradient);
            margin-top: 8px;
        }

        /* 占位logo块 */
        .logo-placeholder {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: var(--bg-muted);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .logo-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* 选中文本 */
        ::selection {
            background: rgba(0, 229, 160, 0.25);
            color: #fff;
        }

        /* 聚焦可见 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary-500);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* 移动端价格卡顶部色条替代发光 */
        @media (max-width: 640px) {
            .pricing-card.featured {
                border-top: 4px solid var(--primary-500);
            }
        }