/* roulang page: index */
:root {
            --brand-green: #3D6B4F;
            --brand-green-deep: #2F5540;
            --brand-green-dark: #1E3A2B;
            --brand-green-pale: #F3F7F4;
            --accent-gold: #B8956A;
            --accent-gold-deep: #A07845;
            --accent-gold-pale: #F5EFE6;
            --bg-warm: #FAF7F2;
            --white: #FFFFFF;
            --text-dark: #2D2D2D;
            --text-muted: #6B6B6B;
            --text-light: #9E9E9E;
            --border-warm: #E8E3DA;
            --border-light: #D1CCC3;
            --accent-red: #C44B3C;
            --shadow-card: 0 4px 20px rgba(30, 58, 43, 0.06);
            --shadow-card-hover: 0 8px 32px rgba(30, 58, 43, 0.10);
            --shadow-nav: 0 2px 16px rgba(0, 0, 0, 0.05);
            --radius-btn: 8px;
            --radius-btn-sm: 6px;
            --radius-card: 12px;
            --radius-img: 10px;
            --radius-input: 8px;
            --radius-full: 50%;
            --max-width: 1200px;
            --nav-height-desktop: 72px;
            --nav-height-mobile: 60px;
            --section-gap-desktop: 120px;
            --section-gap-tablet: 80px;
            --section-gap-mobile: 60px;
            --font-family: 'Noto Sans SC', system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s ease;
            --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height-desktop);
            -webkit-text-size-adjust: 100%;
            text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-dark);
            background-color: var(--bg-warm);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
            min-width: 320px;
        }

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

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

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

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ========== NAVBAR ========== */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height-desktop);
            background: var(--white);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition-smooth), background var(--transition-smooth);
            will-change: box-shadow;
        }

        .nav.scrolled {
            box-shadow: var(--shadow-nav);
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            height: 100%;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--brand-green);
            letter-spacing: -0.01em;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .nav-logo svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            flex-shrink: 0;
        }

        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-dark);
            position: relative;
            padding: 4px 0;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }

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

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--brand-green);
        }

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

        .nav-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            background: var(--accent-gold);
            color: var(--white) !important;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            white-space: nowrap;
            transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            box-shadow: 0 2px 8px rgba(184, 149, 106, 0.25);
        }

        .nav-cta:hover {
            background: var(--accent-gold-deep);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(184, 149, 106, 0.35);
        }

        .nav-cta::after {
            display: none !important;
        }

        .nav-hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
            padding: 8px 4px;
            background: none;
            border: none;
        }

        .nav-hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--brand-green);
            border-radius: 2px;
            transition: all var(--transition-smooth);
            transform-origin: center;
        }

        .nav-hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }

        .nav-hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }

        .nav-hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        .nav-mobile-panel {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--bg-warm);
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-smooth);
        }

        .nav-mobile-panel.open {
            opacity: 1;
            pointer-events: auto;
        }

        .nav-mobile-panel a {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            transition: color var(--transition-fast);
        }

        .nav-mobile-panel a:hover {
            color: var(--brand-green);
        }

        .nav-mobile-panel .nav-cta {
            font-size: 18px;
            padding: 14px 36px;
            margin-top: 8px;
        }

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

        .hero .container {
            display: flex;
            align-items: center;
            gap: 48px;
            width: 100%;
        }

        .hero-text {
            flex: 0 0 55%;
            padding-right: 20px;
        }

        .hero-text h1 {
            font-size: clamp(32px, 5vw, 54px);
            line-height: 1.15;
            font-weight: 800;
            color: var(--text-dark);
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }

        .hero-text h1 .highlight {
            color: var(--brand-green);
            position: relative;
        }

        .hero-text .hero-subtitle {
            font-size: clamp(16px, 2vw, 19px);
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 32px;
            max-width: 480px;
        }

        .hero-decorator {
            width: 60px;
            height: 3px;
            background: var(--accent-gold);
            border-radius: 4px;
            margin-bottom: 28px;
        }

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

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 36px;
            background: var(--accent-gold);
            color: var(--white);
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 16px;
            white-space: nowrap;
            transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            box-shadow: 0 4px 14px rgba(184, 149, 106, 0.3);
            letter-spacing: 0.01em;
        }

        .btn-primary:hover {
            background: var(--accent-gold-deep);
            transform: translateY(-2px);
            box-shadow: 0 6px 22px rgba(184, 149, 106, 0.4);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 15px 34px;
            background: transparent;
            color: var(--text-dark);
            border: 2px solid var(--border-light);
            border-radius: var(--radius-btn-sm);
            font-weight: 600;
            font-size: 16px;
            white-space: nowrap;
            transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
        }

        .btn-secondary:hover {
            border-color: var(--accent-gold);
            color: var(--accent-gold);
            transform: translateY(-2px);
        }

        .hero-image {
            flex: 0 0 45%;
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            aspect-ratio: 4 / 5;
            max-height: 600px;
            background: linear-gradient(135deg, #3D6B4F 0%, #2F5540 40%, #1E3A2B 100%);
            box-shadow: var(--shadow-card-hover);
        }

        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            top: 0;
            left: 0;
        }

        .hero-image .overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(30, 58, 43, 0.06);
            pointer-events: none;
            z-index: 1;
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: var(--section-gap-desktop) 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: clamp(26px, 4vw, 38px);
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .section-header .section-decorator {
            display: inline-block;
            width: 50px;
            height: 3px;
            background: var(--brand-green);
            border-radius: 3px;
            margin-bottom: 12px;
        }

        .section-header p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .section-header.left-align {
            text-align: left;
        }

        .section-header.left-align .section-decorator {
            margin-left: 0;
        }

        /* ========== SERVICES ========== */
        .services-grid {
            display: flex;
            gap: 28px;
            align-items: stretch;
        }

        .service-card-wide {
            flex: 0 0 50%;
            border-radius: var(--radius-card);
            overflow: hidden;
            position: relative;
            min-height: 400px;
            display: flex;
            align-items: flex-end;
            background: linear-gradient(135deg, #3D6B4F 0%, #2F5540 50%, #1E3A2B 100%);
            cursor: pointer;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
            box-shadow: var(--shadow-card);
        }

        .service-card-wide:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }

        .service-card-wide img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
        }

        .service-card-wide .card-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to top, rgba(30, 58, 43, 0.75) 0%, rgba(30, 58, 43, 0.2) 50%, rgba(30, 58, 43, 0.05) 100%);
            z-index: 1;
            transition: background var(--transition-smooth);
        }

        .service-card-wide:hover .card-overlay {
            background: linear-gradient(to top, rgba(30, 58, 43, 0.85) 0%, rgba(30, 58, 43, 0.35) 50%, rgba(30, 58, 43, 0.1) 100%);
        }

        .service-card-wide .card-content {
            position: relative;
            z-index: 2;
            padding: 32px 28px;
            color: var(--white);
        }

        .service-card-wide .card-content h3 {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 6px;
            letter-spacing: -0.01em;
        }

        .service-card-wide .card-content p {
            font-size: 15px;
            opacity: 0.9;
            line-height: 1.6;
        }

        .service-cards-stack {
            flex: 0 0 calc(50% - 28px);
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .service-card-stacked {
            flex: 1;
            background: var(--white);
            border-radius: var(--radius-card);
            padding: 28px 24px 28px 28px;
            display: flex;
            gap: 18px;
            align-items: flex-start;
            border-left: 4px solid var(--brand-green);
            box-shadow: var(--shadow-card);
            cursor: pointer;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-fast);
            position: relative;
        }

        .service-card-stacked:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-left-color: var(--accent-gold);
        }

        .service-card-stacked .card-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: var(--brand-green-pale);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand-green);
        }

        .service-card-stacked .card-icon svg {
            width: 24px;
            height: 24px;
        }

        .service-card-stacked .card-info h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 4px;
            letter-spacing: -0.01em;
        }

        .service-card-stacked .card-info p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== ADVANTAGES ========== */
        .advantages-section {
            background: var(--brand-green-pale);
        }

        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }

        .advantage-item {
            position: relative;
            padding: 20px 16px;
        }

        .advantage-number {
            font-size: clamp(42px, 7vw, 68px);
            font-weight: 800;
            color: var(--accent-gold);
            line-height: 1;
            letter-spacing: -0.02em;
            position: relative;
            display: inline-block;
        }

        .advantage-number .unit {
            font-size: 0.45em;
            font-weight: 600;
            margin-left: 2px;
            color: var(--accent-gold);
        }

        .advantage-decorator {
            display: block;
            width: 40px;
            height: 2px;
            background: var(--brand-green);
            margin: 10px auto 12px;
            transform: rotate(-15deg);
            border-radius: 1px;
        }

        .advantage-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
            letter-spacing: 0.02em;
        }

        /* ========== CASES ========== */
        .cases-scroll {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 12px;
            scrollbar-width: none;
            cursor: grab;
        }

        .cases-scroll::-webkit-scrollbar {
            display: none;
        }

        .cases-scroll:active {
            cursor: grabbing;
        }

        .case-card {
            flex: 0 0 360px;
            scroll-snap-align: start;
            border-radius: var(--radius-card);
            overflow: hidden;
            background: var(--white);
            box-shadow: var(--shadow-card);
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
            cursor: pointer;
            user-select: none;
        }

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

        .case-card-image {
            width: 100%;
            height: 200px;
            background: linear-gradient(135deg, #3D6B4F 0%, #2F5540 60%, #1E3A2B 100%);
            position: relative;
            overflow: hidden;
        }

        .case-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .case-card-body {
            padding: 20px 22px 22px;
        }

        .case-card-body h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
            letter-spacing: -0.01em;
        }

        .case-card-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .case-tag {
            display: inline-block;
            padding: 5px 12px;
            background: var(--accent-gold-pale);
            color: var(--accent-gold);
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        /* ========== SOLUTIONS ========== */
        .solutions-timeline {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
        }

        .solutions-timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border-warm);
            transform: translateX(-50%);
            border-radius: 1px;
            border-style: dashed;
        }

        .solution-step {
            display: flex;
            align-items: flex-start;
            margin-bottom: 48px;
            position: relative;
            gap: 32px;
        }

        .solution-step:nth-child(odd) {
            flex-direction: row;
            padding-right: calc(50% + 40px);
        }

        .solution-step:nth-child(even) {
            flex-direction: row-reverse;
            padding-left: calc(50% + 40px);
        }

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

        .solution-node {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-full);
            background: var(--brand-green);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            z-index: 2;
            position: relative;
            box-shadow: 0 0 0 8px var(--bg-warm);
        }

        .solution-card {
            background: var(--white);
            border-radius: var(--radius-card);
            padding: 24px 22px;
            box-shadow: var(--shadow-card);
            flex: 1;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
        }

        .solution-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }

        .solution-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
            letter-spacing: -0.01em;
        }

        .solution-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
        }

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

        .faq-item {
            background: var(--white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: box-shadow var(--transition-fast);
            border: 1px solid transparent;
        }

        .faq-item.open {
            border-color: var(--border-warm);
            box-shadow: var(--shadow-card-hover);
        }

        .faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 20px 22px;
            cursor: pointer;
            user-select: none;
            transition: background var(--transition-fast);
            width: 100%;
            text-align: left;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-dark);
            background: none;
            border: none;
            font-family: inherit;
        }

        .faq-question:hover {
            background: var(--brand-green-pale);
        }

        .faq-item.open .faq-question {
            color: var(--brand-green);
        }

        .faq-icon-q {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: var(--radius-full);
            background: var(--brand-green);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }

        .faq-item.open .faq-icon-q {
            background: var(--accent-gold);
        }

        .faq-toggle {
            margin-left: auto;
            flex-shrink: 0;
            font-size: 22px;
            color: var(--text-muted);
            transition: transform var(--transition-smooth), color var(--transition-fast);
            line-height: 1;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .faq-item.open .faq-toggle {
            transform: rotate(45deg);
            color: var(--brand-green);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth);
        }

        .faq-answer-inner {
            padding: 0 22px 20px 64px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.75;
            background: var(--brand-green-pale);
            margin: 0 12px 12px;
            border-radius: 8px;
        }

        /* ========== CONTACT CTA ========== */
        .contact-section {
            background: var(--brand-green-dark);
            color: var(--white);
        }

        .contact-wrapper {
            display: flex;
            gap: 40px;
            align-items: stretch;
            background: var(--white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
            color: var(--text-dark);
        }

        .contact-info {
            flex: 1;
            padding: 48px 36px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            background: var(--bg-warm);
            min-width: 0;
        }

        .contact-info h2 {
            font-size: clamp(24px, 3.5vw, 32px);
            font-weight: 700;
            margin-bottom: 10px;
            letter-spacing: -0.01em;
            color: var(--text-dark);
        }

        .contact-info .contact-decorator {
            width: 50px;
            height: 3px;
            background: var(--accent-gold);
            border-radius: 3px;
            margin-bottom: 16px;
        }

        .contact-info p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .contact-info-items {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .contact-info-item {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 15px;
            color: var(--text-dark);
        }

        .contact-info-item svg {
            width: 20px;
            height: 20px;
            color: var(--brand-green);
            flex-shrink: 0;
        }

        .contact-form-wrap {
            flex: 1;
            padding: 48px 36px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-width: 0;
        }

        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid var(--border-warm);
            border-radius: var(--radius-input);
            font-size: 15px;
            color: var(--text-dark);
            background: var(--white);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            resize: vertical;
        }

        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--brand-green);
            box-shadow: 0 0 0 3px rgba(61, 107, 79, 0.08);
            outline: none;
        }

        .contact-form textarea {
            min-height: 100px;
        }

        .btn-submit {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 15px 32px;
            background: var(--brand-green);
            color: var(--white);
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            letter-spacing: 0.01em;
            border: none;
        }

        .btn-submit:hover {
            background: var(--brand-green-deep);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(61, 107, 79, 0.3);
        }

        /* ========== FOOTER ========== */
        .footer {
            background: var(--brand-green-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            padding-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 16px;
            letter-spacing: 0.01em;
        }

        .footer-col p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.65);
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition-fast);
        }

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

        .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--white);
            margin-bottom: 12px;
            display: inline-block;
            letter-spacing: -0.01em;
        }

        .footer-social {
            display: flex;
            gap: 14px;
            margin-top: 16px;
        }

        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-full);
            background: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.7);
            transition: background var(--transition-fast), color var(--transition-fast);
            cursor: pointer;
        }

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

        .footer-social a svg {
            width: 18px;
            height: 18px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        /* ========== BACK TO TOP ========== */
        .back-to-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            z-index: 900;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-full);
            background: var(--brand-green);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(30, 58, 43, 0.3);
            opacity: 0;
            pointer-events: none;
            transform: translateY(12px);
            transition: opacity var(--transition-smooth), transform var(--transition-smooth), background var(--transition-fast);
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }

        .back-to-top:hover {
            background: var(--brand-green-deep);
            transform: translateY(-3px);
        }

        .back-to-top svg {
            width: 20px;
            height: 20px;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1023px) {
            .hero .container {
                gap: 32px;
            }
            .hero-text {
                flex: 0 0 52%;
            }
            .hero-image {
                flex: 0 0 48%;
                aspect-ratio: 3 / 4;
                max-height: 480px;
            }
            .services-grid {
                gap: 20px;
            }
            .service-card-wide {
                flex: 0 0 48%;
                min-height: 340px;
            }
            .service-cards-stack {
                flex: 0 0 calc(52% - 20px);
                gap: 20px;
            }
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .case-card {
                flex: 0 0 320px;
            }
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 24px;
            }
            .footer-grid .footer-col:last-child {
                grid-column: span 2;
            }
            .solution-step:nth-child(odd) {
                padding-right: calc(50% + 28px);
            }
            .solution-step:nth-child(even) {
                padding-left: calc(50% + 28px);
            }
            .section {
                padding: var(--section-gap-tablet) 0;
            }
            .contact-wrapper {
                flex-direction: column;
            }
        }

        @media (max-width: 767px) {
            html {
                scroll-padding-top: var(--nav-height-mobile);
            }
            .nav {
                height: var(--nav-height-mobile);
            }
            .nav-links {
                display: none;
            }
            .nav-hamburger {
                display: flex;
            }
            .nav-mobile-panel {
                display: flex;
            }
            .hero {
                padding-top: var(--nav-height-mobile);
                min-height: auto;
                padding-bottom: 40px;
            }
            .hero .container {
                flex-direction: column-reverse;
                gap: 24px;
                text-align: center;
            }
            .hero-text {
                flex: 0 0 auto;
                padding-right: 0;
                text-align: center;
            }
            .hero-text .hero-subtitle {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-decorator {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-image {
                flex: 0 0 auto;
                width: 100%;
                aspect-ratio: 16 / 9;
                max-height: 360px;
                border-radius: var(--radius-card);
            }
            .hero-text h1 {
                font-size: 30px;
            }
            .section {
                padding: var(--section-gap-mobile) 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .services-grid {
                flex-direction: column;
                gap: 20px;
            }
            .service-card-wide {
                flex: 0 0 auto;
                min-height: 280px;
                width: 100%;
            }
            .service-cards-stack {
                flex: 0 0 auto;
                gap: 16px;
            }
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .advantage-number {
                font-size: 42px;
            }
            .case-card {
                flex: 0 0 85vw;
                max-width: 360px;
            }
            .case-card-image {
                height: 160px;
            }
            .solutions-timeline::before {
                left: 20px;
            }
            .solution-step,
            .solution-step:nth-child(odd),
            .solution-step:nth-child(even) {
                flex-direction: row;
                padding-left: 52px;
                padding-right: 0;
                gap: 16px;
            }
            .solution-node {
                position: absolute;
                left: -2px;
                top: 0;
            }
            .solution-card {
                flex: 1;
            }
            .faq-question {
                font-size: 15px;
                padding: 16px 14px;
            }
            .faq-answer-inner {
                padding: 0 14px 16px 48px;
                margin: 0 8px 8px;
                font-size: 14px;
            }
            .contact-wrapper {
                flex-direction: column;
                border-radius: var(--radius-card);
            }
            .contact-info,
            .contact-form-wrap {
                padding: 28px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .footer-grid .footer-col:first-child {
                grid-column: span 2;
            }
            .footer-grid .footer-col:last-child {
                grid-column: span 2;
            }
            .back-to-top {
                bottom: 20px;
                right: 16px;
                width: 40px;
                height: 40px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 14px 24px;
                font-size: 15px;
            }
            .nav-logo {
                font-size: 19px;
            }
            .nav-logo svg {
                width: 26px;
                height: 26px;
            }
        }

        @media (max-width: 520px) {
            .hero-text h1 {
                font-size: 26px;
            }
            .hero-text .hero-subtitle {
                font-size: 15px;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .advantages-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .advantage-number {
                font-size: 36px;
            }
            .advantage-label {
                font-size: 12px;
            }
            .advantage-decorator {
                width: 28px;
                margin: 8px auto 10px;
            }
            .case-card {
                flex: 0 0 88vw;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .footer-grid .footer-col {
                grid-column: span 1;
            }
            .footer-grid .footer-col:first-child,
            .footer-grid .footer-col:last-child {
                grid-column: span 1;
            }
            .btn-primary {
                padding: 14px 20px;
                font-size: 14px;
            }
            .btn-secondary {
                padding: 13px 20px;
                font-size: 14px;
            }
            .service-card-stacked {
                padding: 20px 16px 20px 18px;
            }
            .service-card-stacked .card-icon {
                width: 40px;
                height: 40px;
            }
            .service-card-stacked .card-info h3 {
                font-size: 17px;
            }
        }