/* roulang page: index */
:root {
            --primary-deep: #1A1F2B;
            --accent-gold: #C8A96E;
            --bg-warm: #F8F6F2;
            --emerald-deep: #0F4C5C;
            --text-primary: #1A1F2B;
            --text-secondary: #4A4F5A;
            --text-muted: #8A8F95;
            --card-bg: #FFFFFF;
            --border-subtle: #E5E2DC;
            --input-border: #D5D2CB;
            --shadow-sm: 0 4px 20px rgba(26, 31, 43, 0.06);
            --shadow-md: 0 12px 32px rgba(26, 31, 43, 0.12);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-pill: 40px;
            --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
            --font-sans: 'Noto Sans SC', 'Inter', 'Helvetica Neue', sans-serif;
            --font-mono: 'DM Sans', 'Inter', monospace;
            --transition-base: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --spacing-section: 100px;
            --max-width: 1280px;
            --header-height: 72px;
        }

        *,
        *::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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-warm);
            overflow-x: hidden;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
            background: transparent;
        }

        .container {
            max-width: var(--max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: 40px;
            padding-right: 40px;
        }

        /* Header/Nav */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(248, 246, 242, 0.88);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
            z-index: 1000;
            display: flex;
            align-items: center;
            transition: background var(--transition-base), box-shadow var(--transition-base);
        }

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

        .logo {
            display: flex;
            align-items: baseline;
            gap: 6px;
            font-family: var(--font-serif);
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-deep);
            letter-spacing: 0.5px;
        }

        .logo .en-brand {
            font-family: var(--font-mono);
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--accent-gold);
            letter-spacing: 2px;
            text-transform: uppercase;
            margin-left: 4px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2.2rem;
            list-style: none;
        }

        .nav-links a {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--primary-deep);
            position: relative;
            padding-bottom: 4px;
            transition: color var(--transition-base);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-gold);
            transition: width var(--transition-base);
        }

        .nav-links a:hover {
            color: var(--accent-gold);
        }

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

        .nav-right {
            display: flex;
            align-items: center;
            gap: 18px;
        }

        .online-badge {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #10B981;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(1.8);
            }
        }

        .btn {
            display: inline-block;
            padding: 14px 32px;
            font-weight: 600;
            font-size: 15px;
            border-radius: var(--radius-btn);
            cursor: pointer;
            text-align: center;
            transition: all var(--transition-base);
            letter-spacing: 0.3px;
            border: 1.5px solid transparent;
        }

        .btn-primary {
            background: var(--accent-gold);
            color: var(--primary-deep);
            border-color: var(--accent-gold);
        }

        .btn-primary:hover {
            background: #b8934f;
            border-color: #b8934f;
            box-shadow: 0 8px 18px rgba(200, 169, 110, 0.25);
            transform: translateY(-1px);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary-deep);
            border-color: var(--primary-deep);
        }

        .btn-outline:hover {
            background: var(--primary-deep);
            color: #fff;
            border-color: var(--primary-deep);
            transform: translateY(-1px);
        }

        .btn-small {
            padding: 10px 22px;
            font-size: 14px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: none;
            border: none;
            padding: 8px;
        }

        .hamburger span {
            width: 24px;
            height: 2px;
            background: var(--primary-deep);
            transition: var(--transition-base);
            display: block;
        }

        /* Hero */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--header-height);
            position: relative;
            overflow: hidden;
            background: var(--bg-warm);
        }

        .hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
            width: 100%;
        }

        .hero-content {
            animation: fadeUp 1s ease forwards;
        }

        .hero-content h1 {
            font-family: var(--font-serif);
            font-size: 3.5rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary-deep);
            letter-spacing: -0.5px;
            margin-bottom: 1.5rem;
        }

        .hero-content .subtitle {
            font-size: 1.125rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 2rem;
            max-width: 90%;
        }

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

        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            animation: floatGraphic 20s infinite alternate ease-in-out;
        }

        .abstract-graphic {
            width: 100%;
            height: 500px;
            background: radial-gradient(circle at 30% 40%, rgba(200, 169, 110, 0.2) 0%, rgba(15, 76, 92, 0.1) 45%, rgba(26, 31, 43, 0.05) 80%);
            border-radius: 50%;
            position: relative;
            filter: blur(40px);
        }

        .abstract-ring {
            position: absolute;
            width: 400px;
            height: 400px;
            border: 1.5px solid rgba(200, 169, 110, 0.25);
            border-radius: 50%;
            top: 10%;
            left: 15%;
            animation: spinSlow 28s infinite linear;
        }

        .abstract-ring:nth-child(2) {
            width: 320px;
            height: 320px;
            border-color: rgba(26, 31, 43, 0.08);
            top: 20%;
            left: 25%;
            animation-duration: 35s;
            animation-direction: reverse;
        }

        @keyframes spinSlow {
            from {
                transform: rotate(0deg);
            }
            to {
                transform: rotate(360deg);
            }
        }

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

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .scroll-indicator {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            color: var(--accent-gold);
            font-size: 0.7rem;
            letter-spacing: 1px;
            animation: bounce 2s infinite;
        }

        .scroll-indicator span {
            width: 1px;
            height: 28px;
            background: var(--accent-gold);
        }

        @keyframes bounce {
            0%,
            100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(8px);
            }
        }

        /* Section Base */
        section {
            padding: var(--spacing-section) 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }

        .section-header h2 {
            font-family: var(--font-serif);
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-deep);
            margin-bottom: 0.75rem;
        }

        .section-header .section-desc {
            color: var(--text-secondary);
            font-size: 1.05rem;
        }

        /* Services 2+1 */
        .services-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 24px;
        }

        .service-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 2rem;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

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

        .service-card.large {
            grid-row: span 2;
            background: #ffffff;
        }

        .icon-slot {
            width: 48px;
            height: 48px;
            background: var(--emerald-deep);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: white;
            font-size: 1.4rem;
        }

        .service-card h3 {
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--primary-deep);
        }

        .service-card .desc {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 1.2rem;
            line-height: 1.6;
        }

        .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
        }

        .tag {
            background: #F0F4F5;
            color: var(--primary-deep);
            font-size: 0.75rem;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 500;
        }

        /* Trust Numbers */
        .trust-strip {
            background: var(--emerald-deep);
            color: white;
            padding: 3rem 0;
            overflow: hidden;
        }

        .numbers-row {
            display: flex;
            justify-content: space-around;
            text-align: center;
            flex-wrap: wrap;
            gap: 2rem;
        }

        .num-item .number {
            font-family: var(--font-mono);
            font-size: 2.8rem;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .num-item .label {
            font-size: 0.9rem;
            opacity: 0.8;
            margin-top: 0.3rem;
        }

        /* Cases */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .case-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

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

        .case-img {
            height: 200px;
            background-size: cover;
            background-position: center;
            position: relative;
            transition: transform 0.4s ease;
            overflow: hidden;
        }

        .case-card:hover .case-img {
            transform: scale(1.03);
        }

        .case-img .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(26, 31, 43, 0.6) 0%, transparent 60%);
            display: flex;
            align-items: flex-end;
            padding: 1rem;
            opacity: 0;
            transition: opacity var(--transition-base);
        }

        .case-card:hover .overlay {
            opacity: 1;
        }

        .overlay span {
            color: white;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .case-info {
            padding: 1.5rem;
        }

        .case-tag {
            background: var(--accent-gold);
            color: #fff;
            font-size: 0.7rem;
            padding: 2px 10px;
            border-radius: 12px;
            display: inline-block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }

        .case-info h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .case-info .result {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* Solutions alternating */
        .solution-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
            margin-bottom: 4rem;
        }

        .solution-row:last-child {
            margin-bottom: 0;
        }

        .solution-img {
            background: #E5E2DC;
            border-radius: var(--radius-card);
            height: 320px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .solution-text h3 {
            font-family: var(--font-serif);
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }

        .solution-text p {
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .reverse .solution-img {
            order: 2;
        }

        .reverse .solution-text {
            order: 1;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            transition: opacity var(--transition-base);
            cursor: pointer;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 0;
            font-weight: 600;
            font-size: 1.1rem;
            color: var(--primary-deep);
        }

        .faq-question .q-icon {
            font-family: var(--font-serif);
            color: var(--accent-gold);
            font-size: 1.6rem;
            margin-right: 12px;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s;
            background: #F0F4F5;
            border-left: 3px solid var(--accent-gold);
            padding: 0 1.5rem;
            margin-bottom: 0;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
            border-radius: 0 0 8px 8px;
        }

        .faq-item.open .faq-answer {
            max-height: 250px;
            padding: 1.2rem 1.5rem;
            margin-bottom: 8px;
        }

        /* CTA Section */
        .cta-section {
            background: var(--primary-deep);
            color: #fff;
            padding: 4rem 0;
        }

        .cta-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .cta-left h2 {
            font-family: var(--font-serif);
            font-size: 2.4rem;
            margin-bottom: 1rem;
        }

        .cta-form input,
        .cta-form textarea {
            width: 100%;
            padding: 14px 16px;
            border-radius: var(--radius-btn);
            background: #fff;
            border: 1px solid #D5D2CB;
            margin-bottom: 1rem;
            transition: border var(--transition-base);
        }

        .cta-form input:focus,
        .cta-form textarea:focus {
            border-color: var(--accent-gold);
            box-shadow: 0 0 0 3px rgba(200, 169, 110, 0.2);
        }

        /* Footer */
        .footer {
            background: var(--primary-deep);
            color: #ddd;
            padding: 3rem 0 1.5rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer a {
            color: #ccc;
        }

        .footer a:hover {
            color: var(--accent-gold);
        }

        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.8rem;
            color: #999;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .cases-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .solution-row {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .reverse .solution-img {
                order: -1;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding-left: 20px;
                padding-right: 20px;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(248, 246, 242, 0.96);
                flex-direction: column;
                padding: 1.5rem;
                gap: 1.2rem;
                backdrop-filter: blur(10px);
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: flex;
            }
            .hero .container {
                grid-template-columns: 1fr;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .cases-grid {
                grid-template-columns: 1fr;
                overflow-x: auto;
                display: flex;
                flex-wrap: nowrap;
            }
            .case-card {
                min-width: 260px;
            }
            .numbers-row {
                flex-direction: column;
                gap: 1.5rem;
            }
            .cta-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            h2 {
                font-size: 2rem !important;
            }
            .hero-visual {
                height: 300px;
            }
        }