/* roulang page: index */
:root {
            --color-primary: #0C0C0C;
            --color-accent: #00C853;
            --color-cta: #FF4D2D;
            --color-cta-hover: #E63E1F;
            --color-bg: #FFFFFF;
            --color-bg-alt: #F6F6F6;
            --color-text: #1A1A1A;
            --color-text-secondary: #5C5C5C;
            --color-border: #E8E8E8;
            --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.10);
            --shadow-cta: 0 4px 14px rgba(255, 77, 45, 0.30);
            --shadow-cta-hover: 0 6px 22px rgba(255, 77, 45, 0.45);
            --radius-card: 8px;
            --radius-button: 6px;
            --radius-img: 4px;
            --transition-fast: 0.25s ease;
            --transition-smooth: 0.35s ease;
        }

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

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

        body {
            font-family: var(--font-stack);
            font-weight: 400;
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            overflow-x: hidden;
        }

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

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

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

        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: #FFFFFF;
            height: 64px;
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition-fast), border-bottom var(--transition-fast);
            border-bottom: 1px solid transparent;
        }

        .site-header.scrolled {
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
            border-bottom: 1px solid var(--color-border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .logo {
            font-weight: 800;
            font-size: 22px;
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 0;
            white-space: nowrap;
        }

        .logo-text {
            letter-spacing: 0.04em;
        }

        .logo-accent {
            display: inline-block;
            width: 3px;
            height: 18px;
            background: var(--color-accent);
            margin-left: 6px;
            border-radius: 2px;
            flex-shrink: 0;
        }

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

        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            position: relative;
            padding-bottom: 4px;
            transition: color var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--color-accent);
            transition: width var(--transition-fast);
            border-radius: 1px;
        }

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

        .nav-cta-btn {
            background: var(--color-cta);
            color: #FFFFFF;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 700;
            border-radius: var(--radius-button);
            letter-spacing: 0.03em;
            box-shadow: var(--shadow-cta);
            transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            white-space: nowrap;
        }

        .nav-cta-btn:hover {
            background: var(--color-cta-hover);
            box-shadow: var(--shadow-cta-hover);
            transform: scale(1.05);
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            width: 32px;
            height: 24px;
            flex-direction: column;
            justify-content: space-between;
            padding: 0;
            z-index: 1001;
        }

        .hamburger span {
            display: block;
            width: 100%;
            height: 3px;
            background: var(--color-primary);
            border-radius: 2px;
            transition: transform var(--transition-fast), opacity var(--transition-fast);
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(10.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-10.5px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: #FFFFFF;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            padding: 20px;
            z-index: 999;
            flex-direction: column;
            gap: 16px;
            transform: translateY(-10px);
            opacity: 0;
            pointer-events: none;
            transition: transform var(--transition-smooth), opacity var(--transition-smooth);
        }

        .mobile-menu.active {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            display: block;
            font-size: 16px;
            font-weight: 500;
            color: var(--color-text);
            padding: 10px 0;
            border-bottom: 1px solid var(--color-border);
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }
        .mobile-menu .mobile-cta {
            display: inline-block;
            background: var(--color-cta);
            color: #FFFFFF;
            padding: 10px 20px;
            border-radius: var(--radius-button);
            font-weight: 700;
            text-align: center;
            margin-top: 4px;
        }

        /* Hero */
        .hero-section {
            min-height: 85vh;
            display: flex;
            align-items: center;
            position: relative;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            background-attachment: fixed;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(12, 12, 12, 0.88) 0%, rgba(12, 12, 12, 0.55) 100%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
            width: 100%;
        }

        .hero-content h1 {
            font-weight: 800;
            font-size: 56px;
            line-height: 1.15;
            letter-spacing: -0.02em;
            color: #FFFFFF;
            max-width: 700px;
            margin-bottom: 20px;
        }

        .hero-subtitle {
            font-size: 19px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            line-height: 1.7;
            margin-bottom: 36px;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-block;
            background: var(--color-cta);
            color: #FFFFFF;
            padding: 14px 36px;
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 0.03em;
            border-radius: var(--radius-button);
            box-shadow: var(--shadow-cta);
            transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            text-align: center;
            cursor: pointer;
        }

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

        .hero-secondary-link {
            color: rgba(255, 255, 255, 0.7);
            font-size: 16px;
            font-weight: 500;
            transition: color var(--transition-fast);
            cursor: pointer;
        }
        .hero-secondary-link:hover {
            color: #FFFFFF;
        }
        .hero-secondary-link i {
            margin-left: 4px;
            animation: bounceDown 1.6s ease infinite;
        }

        @keyframes bounceDown {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(6px);
            }
        }

        /* Sections */
        .section {
            padding: 110px 0;
        }

        .section-alt {
            background: var(--color-bg-alt);
        }

        .section-title {
            font-weight: 700;
            font-size: 38px;
            letter-spacing: -0.01em;
            color: var(--color-primary);
            text-align: center;
            margin-bottom: 16px;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--color-text-secondary);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 56px;
            line-height: 1.7;
        }

        /* Pain Points */
        .pain-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .pain-item {
            display: flex;
            gap: 16px;
            padding: 24px 20px 24px 0;
            border-left: 3px solid var(--color-accent);
            transition: transform var(--transition-fast);
        }

        .pain-item:hover {
            transform: translateX(4px);
        }

        .pain-icon {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-size: 22px;
            margin-top: 2px;
        }

        .pain-text h3 {
            font-weight: 600;
            font-size: 20px;
            color: var(--color-primary);
            margin-bottom: 6px;
        }
        .pain-text p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        /* Solution Cards */
        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .solution-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
        }

        .solution-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }

        .solution-card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            border-radius: var(--radius-img) var(--radius-img) 0 0;
        }

        .solution-card-body {
            padding: 22px 24px 26px;
        }
        .solution-card-body h3 {
            font-weight: 600;
            font-size: 22px;
            color: var(--color-primary);
            margin-bottom: 8px;
        }
        .solution-card-body p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }
        .solution-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }

        .solution-cta-wrap {
            text-align: center;
            margin-top: 40px;
        }

        .btn-secondary {
            display: inline-block;
            background: transparent;
            color: var(--color-primary);
            padding: 12px 32px;
            font-size: 16px;
            font-weight: 700;
            letter-spacing: 0.03em;
            border-radius: var(--radius-button);
            border: 2px solid var(--color-primary);
            transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: var(--color-accent);
            color: #FFFFFF;
            border-color: var(--color-accent);
        }

        /* Results */
        .results-grid {
            display: flex;
            justify-content: center;
            gap: 0;
            flex-wrap: wrap;
            max-width: 900px;
            margin: 0 auto;
        }

        .result-item {
            flex: 1;
            min-width: 160px;
            text-align: center;
            padding: 20px 32px;
            border-right: 1px solid var(--color-border);
            position: relative;
        }
        .result-item:last-child {
            border-right: none;
        }

        .result-number {
            font-weight: 800;
            font-size: 52px;
            color: var(--color-accent);
            line-height: 1.1;
            letter-spacing: -0.01em;
            margin-bottom: 6px;
        }
        .result-label {
            font-size: 14px;
            color: var(--color-text-secondary);
            font-weight: 500;
        }

        /* Testimonials */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .testimonial-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 32px;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
        }

        .testimonial-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }

        .testimonial-quote-icon {
            font-size: 36px;
            color: rgba(0, 200, 83, 0.25);
            margin-bottom: 12px;
            line-height: 1;
        }

        .testimonial-text {
            font-size: 16px;
            color: var(--color-text);
            line-height: 1.8;
            margin-bottom: 20px;
            font-style: italic;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .testimonial-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            object-fit: cover;
            flex-shrink: 0;
        }

        .testimonial-author-info h3 {
            font-weight: 600;
            font-size: 16px;
            color: var(--color-primary);
        }
        .testimonial-author-info span {
            font-size: 13px;
            color: var(--color-text-secondary);
        }

        /* CTA Section */
        .cta-section {
            background: var(--color-primary);
            padding: 110px 0;
            text-align: center;
        }

        .cta-section .section-title {
            color: #FFFFFF;
            font-size: 40px;
            margin-bottom: 12px;
        }

        .cta-section .cta-subtitle {
            color: rgba(255, 255, 255, 0.8);
            font-size: 17px;
            margin-bottom: 36px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }

        .cta-section .btn-primary {
            padding: 16px 44px;
            font-size: 18px;
        }

        .cta-aux-text {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            margin-top: 16px;
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .faq-item {
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--color-border);
            background: #FFFFFF;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            background: #F9F9F9;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 18px;
            color: var(--color-primary);
            text-align: left;
            border: none;
            font-family: var(--font-stack);
            transition: background var(--transition-fast);
            gap: 12px;
        }

        .faq-question:hover {
            background: #f0f0f0;
        }

        .faq-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-accent);
            flex-shrink: 0;
        }

        .faq-question-text {
            flex: 1;
        }

        .faq-icon {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            position: relative;
            transition: transform var(--transition-smooth);
        }

        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            background: var(--color-text-secondary);
            border-radius: 1px;
            transition: transform var(--transition-smooth);
        }
        .faq-icon::before {
            width: 14px;
            height: 2px;
            top: 10px;
            left: 4px;
        }
        .faq-icon::after {
            width: 2px;
            height: 14px;
            top: 4px;
            left: 10px;
            transition: transform var(--transition-smooth), opacity var(--transition-smooth);
        }

        .faq-item.open .faq-icon::after {
            transform: rotate(90deg);
            opacity: 0;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 18px 24px 22px 36px;
            color: var(--color-text);
            line-height: 1.8;
            font-size: 15px;
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary);
            color: #AAAAAA;
            padding: 56px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto 40px;
            padding: 0 20px;
        }

        .footer-col h3 {
            color: #FFFFFF;
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 16px;
        }

        .footer-logo {
            font-weight: 800;
            font-size: 20px;
            color: #FFFFFF;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 0;
        }
        .footer-logo .logo-accent {
            display: inline-block;
            width: 3px;
            height: 16px;
            background: var(--color-accent);
            margin-left: 5px;
            border-radius: 2px;
        }

        .footer-col p {
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 6px;
        }

        .footer-col a {
            color: #AAAAAA;
            font-size: 14px;
            transition: color var(--transition-fast);
            display: block;
            margin-bottom: 8px;
        }
        .footer-col a:hover {
            color: var(--color-accent);
        }
        .footer-contact-link {
            color: var(--color-accent) !important;
            font-weight: 600;
            font-size: 15px !important;
        }

        .footer-bottom {
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
            font-size: 13px;
            color: #777777;
        }

        /* Fade-in animation */
        .fade-in-up {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }
        .fade-in-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Responsive */
        @media (max-width: 1023px) {
            .solution-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .pain-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .hero-content h1 {
                font-size: 44px;
            }
            .section-title {
                font-size: 32px;
            }
            .result-number {
                font-size: 42px;
            }
        }

        @media (max-width: 767px) {
            .nav-links {
                display: none;
            }
            .nav-cta-btn.desktop-only {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-menu {
                display: flex;
            }
            .site-header {
                height: 56px;
            }
            .mobile-menu {
                top: 56px;
            }
            .hero-content h1 {
                font-size: 32px;
            }
            .hero-content {
                padding: 32px 16px;
            }
            .hero-section {
                min-height: 70vh;
                background-attachment: scroll;
            }
            .hero-subtitle {
                font-size: 16px;
                max-width: 100%;
            }
            .section {
                padding: 70px 0;
            }
            .section-title {
                font-size: 28px;
            }
            .section-subtitle {
                font-size: 15px;
                margin-bottom: 40px;
            }
            .pain-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .solution-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .results-grid {
                gap: 0;
            }
            .result-item {
                flex: 1 1 45%;
                min-width: 130px;
                border-right: none;
                padding: 16px 12px;
            }
            .result-number {
                font-size: 36px;
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .cta-section {
                padding: 70px 0;
            }
            .cta-section .section-title {
                font-size: 30px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
            }
            .btn-primary {
                padding: 12px 28px;
                font-size: 16px;
            }
            .faq-question {
                font-size: 16px;
                padding: 14px 18px;
            }
            .faq-answer-inner {
                padding: 14px 18px 18px 28px;
            }
            .container {
                padding: 0 16px;
            }
            .solution-card-body {
                padding: 16px 18px 20px;
            }
            .testimonial-card {
                padding: 24px;
            }
            .header-inner {
                padding: 0 16px;
            }
        }

        @media (max-width: 479px) {
            .hero-content h1 {
                font-size: 30px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .section-title {
                font-size: 24px;
            }
            .result-item {
                flex: 1 1 50%;
                min-width: 110px;
                padding: 12px 8px;
            }
            .result-number {
                font-size: 32px;
            }
            .result-label {
                font-size: 12px;
            }
            .btn-primary {
                padding: 12px 24px;
                font-size: 15px;
                width: 100%;
                text-align: center;
            }
            .btn-secondary {
                padding: 10px 24px;
                font-size: 15px;
            }
            .testimonial-card {
                padding: 20px;
            }
            .pain-item {
                padding: 18px 14px 18px 0;
            }
        }

        @media (min-width: 768px) {
            .nav-cta-btn.desktop-only {
                display: inline-block;
            }
            .mobile-menu {
                display: none !important;
            }
            .mobile-menu.active {
                display: none !important;
            }
        }

        @media (min-width: 1024px) {
            .solution-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .pain-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }