/* roulang page: index */
:root {
            --primary: #0B7A3D;
            --primary-dark: #085A2D;
            --accent: #F4581E;
            --accent-dark: #D14815;
            --gold: #D4A843;
            --dark: #121212;
            --dark-2: #1A1A1A;
            --light: #F5F5F0;
            --footer-dark: #0F0F0F;
            --text-on-dark: #F0F0F0;
            --text-on-light: #1E1E1E;
            --text-muted: #6B6B6B;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-tag: 6px;
            --shadow-light: 0 2px 12px rgba(0, 0, 0, 0.06);
            --shadow-dark: 0 4px 24px rgba(0, 0, 0, 0.4);
            --nav-height: 64px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
        }

        body {
            margin: 0;
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-on-light);
            background: #fff;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

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

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

        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container-site {
                padding: 0 16px;
            }
        }

        /* 导航 */
        #nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: background 0.25s ease, backdrop-filter 0.25s ease, box-shadow 0.25s ease;
            background: transparent;
        }
        #nav.scrolled {
            background: rgba(18, 18, 18, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
        }
        #nav .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            #nav .nav-inner {
                padding: 0 16px;
            }
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.25rem;
            color: #F0F0F0;
            letter-spacing: 0.02em;
            white-space: nowrap;
            z-index: 1002;
        }
        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            flex-shrink: 0;
        }
        .nav-links-desktop {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links-desktop a {
            color: rgba(240, 240, 240, 0.9);
            font-weight: 500;
            font-size: 0.9375rem;
            position: relative;
            padding: 4px 0;
            transition: color 0.2s ease;
        }
        .nav-links-desktop a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent);
            transform: scaleX(0);
            transform-origin: center;
            transition: transform 0.2s ease;
        }
        .nav-links-desktop a:hover {
            color: #fff;
        }
        .nav-links-desktop a:hover::after {
            transform: scaleX(1);
        }
        .nav-cta-btn {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            font-size: 0.875rem;
            transition: background 0.2s ease, box-shadow 0.2s ease;
            white-space: nowrap;
            border: none;
        }
        .nav-cta-btn:hover {
            background: var(--accent-dark);
            box-shadow: 0 0 20px rgba(244, 88, 30, 0.4);
        }

        @media (max-width: 768px) {
            .nav-links-desktop {
                display: none;
            }
            .nav-cta-desktop {
                display: none;
            }
        }
        @media (min-width: 769px) {
            .hamburger-btn {
                display: none;
            }
        }

        /* 汉堡菜单 */
        .hamburger-btn {
            display: flex;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            z-index: 1002;
            cursor: pointer;
            width: 40px;
            height: 32px;
            justify-content: center;
            align-items: center;
        }
        .hamburger-btn span {
            display: block;
            width: 24px;
            height: 2px;
            background: #F0F0F0;
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }
        .hamburger-btn.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger-btn.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger-btn.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            background: rgba(10, 10, 10, 0.96);
            z-index: 1001;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 20px;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        .mobile-menu-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu-overlay a {
            color: #F0F0F0;
            font-size: 1.2rem;
            font-weight: 600;
            opacity: 0;
            transform: translateY(16px);
            transition: opacity 0.4s ease, transform 0.4s ease;
        }
        .mobile-menu-overlay.open a {
            opacity: 1;
            transform: translateY(0);
        }
        .mobile-menu-overlay a:nth-child(1) {
            transition-delay: 0.05s;
        }
        .mobile-menu-overlay a:nth-child(2) {
            transition-delay: 0.1s;
        }
        .mobile-menu-overlay a:nth-child(3) {
            transition-delay: 0.15s;
        }
        .mobile-menu-overlay a:nth-child(4) {
            transition-delay: 0.2s;
        }
        .mobile-menu-overlay a:nth-child(5) {
            transition-delay: 0.25s;
        }
        .mobile-menu-overlay a:nth-child(6) {
            transition-delay: 0.3s;
        }

        /* Hero */
        #hero {
            position: relative;
            background: var(--dark);
            color: var(--text-on-dark);
            min-height: 100vh;
            display: flex;
            align-items: center;
            overflow: hidden;
            padding-top: var(--nav-height);
        }
        #hero .radar-bg {
            position: absolute;
            inset: 0;
            pointer-events: none;
            opacity: 0.12;
            background:
                radial-gradient(ellipse at 75% 55%, rgba(11, 122, 61, 0.5) 0%, transparent 60%),
                radial-gradient(circle at 25% 40%, rgba(212, 168, 67, 0.25) 0%, transparent 50%),
                repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(255, 255, 255, 0.03) 39px, rgba(255, 255, 255, 0.03) 40px),
                repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(255, 255, 255, 0.02) 39px, rgba(255, 255, 255, 0.02) 40px);
            z-index: 0;
        }
        #hero .radar-arc {
            position: absolute;
            top: 18%;
            right: 8%;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            border: 2px dashed rgba(11, 122, 61, 0.25);
            pointer-events: none;
            z-index: 0;
            animation: radar-pulse 4s ease-in-out infinite;
        }
        @keyframes radar-pulse {
            0%,
            100% {
                transform: scale(1);
                opacity: 0.25;
            }
            50% {
                transform: scale(1.08);
                opacity: 0.45;
            }
        }
        #hero .hero-content {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 48px;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 48px 24px;
        }
        @media (max-width: 768px) {
            #hero .hero-content {
                flex-direction: column;
                text-align: center;
                padding: 32px 16px;
                gap: 32px;
            }
            #hero .radar-arc {
                width: 200px;
                height: 200px;
                top: 10%;
                right: -60px;
            }
        }
        .hero-text {
            flex: 0 0 55%;
        }
        @media (max-width: 768px) {
            .hero-text {
                flex: 1;
                order: 1;
            }
        }
        .hero-visual {
            flex: 0 0 40%;
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: 0 0 60px rgba(11, 122, 61, 0.25);
            aspect-ratio: 4/3;
        }
        @media (max-width: 768px) {
            .hero-visual {
                flex: 1;
                width: 100%;
                order: 0;
                aspect-ratio: 16/9;
            }
        }
        .hero-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .hero-text h1 {
            font-size: clamp(2rem, 4vw, 2.75rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin: 0 0 16px;
            color: #F0F0F0;
        }
        .hero-text .hero-subtitle {
            font-size: 1.1rem;
            color: rgba(240, 240, 240, 0.78);
            margin: 0 0 28px;
            line-height: 1.6;
            max-width: 460px;
        }
        @media (max-width: 768px) {
            .hero-text .hero-subtitle {
                max-width: 100%;
            }
        }
        .hero-btns {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .hero-btns {
                justify-content: center;
            }
        }
        .btn-primary {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            transition: background 0.2s ease, box-shadow 0.2s ease;
            border: none;
            text-align: center;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            box-shadow: 0 0 28px rgba(244, 88, 30, 0.5);
        }
        .btn-secondary {
            display: inline-block;
            background: transparent;
            color: var(--primary);
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            border: 2px solid var(--primary);
            transition: background 0.2s ease;
            text-align: center;
        }
        .btn-secondary:hover {
            background: rgba(11, 122, 61, 0.1);
        }
        .hero-stats {
            display: flex;
            gap: 36px;
            margin-top: 36px;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .hero-stats {
                justify-content: center;
                gap: 24px;
            }
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .stat-num {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--gold);
            letter-spacing: -0.01em;
        }
        .hero-stat .stat-label {
            font-size: 0.8rem;
            color: rgba(240, 240, 240, 0.6);
            letter-spacing: 0.04em;
            margin-top: 2px;
        }

        /* 板块通用 */
        .section-pad {
            padding: 100px 0;
        }
        @media (max-width: 768px) {
            .section-pad {
                padding: 56px 0;
            }
        }
        .section-h2 {
            font-size: clamp(1.6rem, 3vw, 2.3rem);
            font-weight: 700;
            letter-spacing: -0.01em;
            margin: 0 0 16px;
            line-height: 1.3;
        }
        .text-muted {
            color: var(--text-muted);
        }

        /* 痛点 */
        #pain {
            background: var(--dark-2);
            color: var(--text-on-dark);
        }
        #pain .pain-grid {
            display: flex;
            gap: 48px;
            align-items: flex-start;
        }
        @media (max-width: 768px) {
            #pain .pain-grid {
                flex-direction: column;
                gap: 32px;
            }
        }
        #pain .pain-left {
            flex: 0 0 55%;
        }
        #pain .pain-left p {
            font-size: 1.05rem;
            line-height: 1.8;
            color: rgba(240, 240, 240, 0.8);
            margin: 0;
        }
        #pain .pain-right {
            flex: 0 0 38%;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .pain-item {
            display: flex;
            gap: 14px;
            align-items: flex-start;
        }
        .pain-item .pain-icon {
            width: 40px;
            height: 40px;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(244, 88, 30, 0.15);
            color: var(--accent);
            font-size: 1rem;
        }
        .pain-item .pain-info h4 {
            margin: 0 0 4px;
            font-size: 0.9rem;
            font-weight: 700;
            color: #F0F0F0;
        }
        .pain-item .pain-info span {
            font-size: 0.8rem;
            color: rgba(240, 240, 240, 0.55);
            line-height: 1.5;
        }

        /* 解决方案 */
        #solution {
            background: var(--light);
            color: var(--text-on-light);
        }
        #solution .steps-row {
            display: flex;
            gap: 24px;
            position: relative;
            flex-wrap: nowrap;
        }
        @media (max-width: 768px) {
            #solution .steps-row {
                flex-direction: column;
                gap: 16px;
            }
        }
        .step-card {
            flex: 1;
            background: #fff;
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-light);
            position: relative;
            transition: all 0.35s ease;
            cursor: default;
            border: 1px solid transparent;
            overflow: hidden;
        }
        .step-card:hover {
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            border-color: rgba(11, 122, 61, 0.2);
            padding-bottom: 40px;
        }
        .step-card .step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-weight: 800;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 14px;
            flex-shrink: 0;
        }
        .step-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 0 0 6px;
            color: var(--text-on-light);
        }
        .step-card .step-brief {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.5;
        }
        .step-card .step-detail {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, margin-top 0.4s ease;
            font-size: 0.85rem;
            color: #555;
            line-height: 1.6;
            margin-top: 0;
        }
        .step-card:hover .step-detail {
            max-height: 80px;
            margin-top: 10px;
        }
        .step-card::after {
            content: '';
            position: absolute;
            right: -18px;
            top: 50%;
            transform: translateY(-50%);
            width: 12px;
            height: 12px;
            border-top: 2px dashed #ccc;
            border-right: 2px dashed #ccc;
            transform: translateY(-50%) rotate(45deg);
            opacity: 0.6;
        }
        .step-card:last-child::after {
            display: none;
        }
        @media (max-width: 768px) {
            .step-card::after {
                right: 50%;
                top: auto;
                bottom: -18px;
                transform: translateX(50%) rotate(135deg);
                width: 12px;
                height: 12px;
            }
            .step-card:last-child::after {
                display: none;
            }
        }

        /* 成果数据 */
        #results {
            background: #fff;
            color: var(--text-on-light);
        }
        #results .results-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
            max-width: 700px;
            margin: 0 auto;
        }
        @media (max-width: 640px) {
            #results .results-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .result-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--light);
            border-radius: var(--radius-card);
            transition: transform 0.3s ease;
        }
        .result-item:hover {
            transform: translateY(-4px);
        }
        .result-item .result-num {
            font-size: 3.2rem;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: -0.02em;
            line-height: 1;
            font-variant-numeric: tabular-nums;
        }
        .result-item .result-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 8px;
            letter-spacing: 0.04em;
        }

        /* 证言 */
        #testimonials {
            background: var(--light);
            color: var(--text-on-light);
        }
        #testimonials .testi-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        @media (max-width: 768px) {
            #testimonials .testi-grid {
                grid-template-columns: 1fr;
            }
        }
        .testi-card {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-light);
            display: flex;
            gap: 0;
            border-left: 4px solid var(--primary);
            transition: box-shadow 0.3s ease;
        }
        @media (max-width: 640px) {
            .testi-card {
                border-left: none;
                border-top: 4px solid var(--primary);
            }
        }
        .testi-card:hover {
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.1);
        }
        .testi-card .testi-body {
            flex: 1;
        }
        .testi-card .testi-quote {
            font-size: 1rem;
            line-height: 1.7;
            color: #333;
            margin: 0 0 16px;
        }
        .testi-card .testi-author {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--text-on-light);
        }
        .testi-card .testi-role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .testi-card .testi-logo {
            width: 56px;
            height: 56px;
            border-radius: 8px;
            background: #e8e8e4;
            border: 1px dashed #ccc;
            flex-shrink: 0;
            margin-left: 16px;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .testi-card .testi-logo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* FAQ */
        #faq {
            background: #fff;
            color: var(--text-on-light);
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid #e8e8e4;
            overflow: hidden;
        }
        .faq-item:first-child {
            border-top: 1px solid #e8e8e4;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 4px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-on-light);
            user-select: none;
            transition: color 0.2s ease;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: inherit;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            flex-shrink: 0;
            transition: transform 0.35s ease;
            font-weight: 700;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 4px;
            color: #555;
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            padding-bottom: 16px;
        }

        /* CTA */
        #cta-contact {
            background: linear-gradient(160deg, #0B7A3D 0%, #0A5E30 40%, #121212 100%);
            color: #F0F0F0;
            text-align: center;
        }
        #cta-contact .cta-title {
            font-size: clamp(1.7rem, 3vw, 2.3rem);
            font-weight: 800;
            margin: 0 0 12px;
        }
        #cta-contact .cta-subtitle {
            font-size: 1.05rem;
            color: rgba(240, 240, 240, 0.8);
            margin: 0 0 28px;
        }
        #cta-contact .btn-cta-large {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-weight: 700;
            padding: 16px 40px;
            border-radius: var(--radius-btn);
            font-size: 1.1rem;
            transition: background 0.2s ease, box-shadow 0.2s ease;
            border: none;
        }
        #cta-contact .btn-cta-large:hover {
            background: var(--accent-dark);
            box-shadow: 0 0 40px rgba(244, 88, 30, 0.6);
        }
        #cta-contact .cta-contact-info {
            margin-top: 20px;
            font-size: 0.85rem;
            color: rgba(240, 240, 240, 0.55);
        }

        /* 页脚 */
        #footer {
            background: var(--footer-dark);
            color: #999;
            padding: 48px 0 24px;
        }
        #footer .footer-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 32px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            #footer .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        #footer .footer-logo {
            font-weight: 700;
            font-size: 1.1rem;
            color: #ccc;
            margin-bottom: 8px;
        }
        #footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        #footer .footer-links a {
            color: #999;
            transition: color 0.2s ease;
            font-size: 0.9rem;
        }
        #footer .footer-links a:hover {
            color: #fff;
        }
        #footer .footer-contact {
            font-size: 0.85rem;
        }
        #footer .footer-bottom {
            text-align: center;
            padding-top: 20px;
            margin-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.8rem;
            color: #666;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 滚动入场动画 */
        .fade-up {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }