/* roulang page: index */
:root {
            --brand-orange: #FF6B00;
            --brand-orange-light: #FF8C42;
            --brand-orange-glow: rgba(255, 107, 0, 0.4);
            --brand-purple: #B44CF0;
            --brand-purple-glow: rgba(180, 76, 240, 0.4);
            --bg-deep: #0A0A0A;
            --bg-card: #141414;
            --bg-card-hover: #1a1a1a;
            --bg-input: #1c1c1c;
            --text-primary: #F5F5F5;
            --text-secondary: #B0B0B0;
            --text-muted: #707070;
            --border-subtle: #2a2a2a;
            --border-orange: rgba(255, 107, 0, 0.3);
            --border-purple: rgba(180, 76, 240, 0.3);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 30px;
            --radius-full: 9999px;
            --shadow-card: 0 8px 20px rgba(255, 107, 0, 0.08);
            --shadow-card-hover: 0 16px 36px rgba(255, 107, 0, 0.18);
            --shadow-glow-orange: 0 0 30px rgba(255, 107, 0, 0.25);
            --shadow-glow-purple: 0 0 24px rgba(180, 76, 240, 0.2);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
            --font-heading: 'Bebas Neue', 'Impact', 'Arial Black', sans-serif;
            --font-numbers: 'Oswald', 'Impact', sans-serif;
            --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --nav-height: 70px;
            --section-padding: 100px 0;
            --container-width: 1200px;
            --grid-gap: 28px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
            min-height: 100vh;
            background-image:
                radial-gradient(ellipse at 25% 15%, rgba(255, 107, 0, 0.03) 0%, transparent 60%),
                radial-gradient(ellipse at 75% 60%, rgba(180, 76, 240, 0.03) 0%, transparent 55%),
                radial-gradient(ellipse at 50% 85%, rgba(255, 107, 0, 0.02) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
        }

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

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        @keyframes pulse-glow {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.5);
            }
            50% {
                box-shadow: 0 0 0 18px rgba(255, 107, 0, 0);
            }
        }

        @keyframes float-particle {
            0%,
            100% {
                transform: translateY(0) translateX(0) scale(1);
                opacity: 0;
            }
            15% {
                opacity: 1;
            }
            40% {
                transform: translateY(-60px) translateX(20px) scale(1.4);
                opacity: 0.9;
            }
            70% {
                transform: translateY(-110px) translateX(-15px) scale(0.7);
                opacity: 0.4;
            }
            100% {
                transform: translateY(-160px) translateX(8px) scale(0.3);
                opacity: 0;
            }
        }

        @keyframes shimmer-line {
            0% {
                background-position: -200% center;
            }
            100% {
                background-position: 200% center;
            }
        }

        @keyframes countUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

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

        @keyframes border-glow-pulse {
            0%,
            100% {
                border-color: rgba(255, 107, 0, 0.25);
            }
            50% {
                border-color: rgba(255, 107, 0, 0.6);
            }
        }

        header.nav-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth),
                -webkit-backdrop-filter var(--transition-smooth);
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth),
                backdrop-filter var(--transition-smooth);
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth),
                backdrop-filter var(--transition-smooth), -webkit-backdrop-filter var(--transition-smooth);
            display: flex;
            align-items: center;
        }

        header.nav-header.scrolled {
            background: rgba(10, 10, 10, 0.92);
            -webkit-backdrop-filter: blur(18px);
            backdrop-filter: blur(18px);
            box-shadow: 0 1px 0 rgba(255, 107, 0, 0.12), 0 4px 20px rgba(0, 0, 0, 0.5);
            border-bottom: 1px solid rgba(255, 107, 0, 0.1);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-size: 1.65rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            color: var(--text-primary);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .nav-logo .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            border-radius: 50%;
            font-size: 1.3rem;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 14px rgba(255, 107, 0, 0.35);
            position: relative;
        }

        .nav-logo .logo-icon::after {
            content: '';
            position: absolute;
            inset: -4px;
            border-radius: 50%;
            border: 2px solid rgba(255, 107, 0, 0.3);
            animation: border-glow-pulse 2.5s ease-in-out infinite;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            font-size: 0.95rem;
            font-weight: 500;
            letter-spacing: 0.02em;
        }

        .nav-links a {
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 100%;
            height: 2px;
            background: var(--brand-orange);
            border-radius: 2px;
            transition: transform var(--transition-smooth);
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: #fff;
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            transform: translateX(-50%) scaleX(1);
        }

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            border-radius: var(--radius-xl);
            white-space: nowrap;
            flex-shrink: 0;
            letter-spacing: 0.03em;
            transition: all var(--transition-smooth);
            box-shadow: 0 4px 16px rgba(255, 107, 0, 0.3);
        }

        .nav-cta-btn:hover {
            box-shadow: 0 8px 28px rgba(255, 107, 0, 0.5);
            transform: translateY(-2px);
        }
        .nav-cta-btn:active {
            transform: scale(0.96);
            box-shadow: 0 2px 8px rgba(255, 107, 0, 0.4);
        }

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

        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 3px;
            transition: all var(--transition-smooth);
            transform-origin: center;
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 10, 0.97);
            -webkit-backdrop-filter: blur(20px);
            backdrop-filter: blur(20px);
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 28px;
            font-size: 1.3rem;
            font-weight: 600;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-smooth);
        }

        .mobile-menu.open {
            display: flex;
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .mobile-menu a:hover {
            color: #fff;
        }
        .mobile-menu .mobile-cta {
            margin-top: 16px;
            padding: 14px 32px;
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            color: #fff;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 1.1rem;
            box-shadow: 0 6px 22px rgba(255, 107, 0, 0.35);
        }

        section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--brand-orange);
            margin-bottom: 12px;
            position: relative;
            padding-left: 18px;
        }
        .section-label::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 10px;
            height: 10px;
            background: var(--brand-orange);
            border-radius: 50%;
            box-shadow: 0 0 10px var(--brand-orange-glow);
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2.4rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            line-height: 1.15;
            margin-bottom: 16px;
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 50px;
            height: 3px;
            background: linear-gradient(90deg, var(--brand-orange), var(--brand-purple));
            border-radius: 4px;
            margin-top: 8px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            line-height: 1.6;
        }

        .hero-section {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding-top: var(--nav-height);
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            isolation: isolate;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg,
                    rgba(10, 10, 10, 0.55) 0%,
                    rgba(10, 10, 10, 0.72) 40%,
                    rgba(10, 10, 10, 0.88) 75%,
                    rgba(10, 10, 10, 0.96) 100%);
            z-index: 1;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background:
                radial-gradient(circle at 30% 20%, rgba(255, 107, 0, 0.12) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(180, 76, 240, 0.08) 0%, transparent 45%);
            z-index: 2;
            pointer-events: none;
        }

        .hero-particles {
            position: absolute;
            inset: 0;
            z-index: 3;
            pointer-events: none;
            overflow: hidden;
        }
        .hero-particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: var(--brand-orange);
            border-radius: 50%;
            animation: float-particle 4s ease-in-out infinite;
            box-shadow: 0 0 8px var(--brand-orange-glow);
        }
        .hero-particle:nth-child(1) {
            left: 12%;
            top: 65%;
            animation-delay: 0s;
            animation-duration: 3.8s;
        }
        .her-particle:nth-child(2) {
            left: 25%;
            top: 55%;
            animation-delay: 0.6s;
            animation-duration: 4.5s;
        }
        .hero-particle:nth-child(3) {
            left: 48%;
            top: 60%;
            animation-delay: 1.2s;
            animation-duration: 3.4s;
        }
        .hero-particle:nth-child(4) {
            left: 62%;
            top: 50%;
            animation-delay: 2s;
            animation-duration: 4.8s;
            background: var(--brand-purple);
            box-shadow: 0 0 8px var(--brand-purple-glow);
        }
        .hero-particle:nth-child(5) {
            left: 78%;
            top: 58%;
            animation-delay: 1.6s;
            animation-duration: 3.6s;
        }
        .hero-particle:nth-child(6) {
            left: 35%;
            top: 70%;
            animation-delay: 2.8s;
            animation-duration: 4.2s;
            background: var(--brand-purple);
            box-shadow: 0 0 8px var(--brand-purple-glow);
        }
        .hero-particle:nth-child(7) {
            left: 55%;
            top: 42%;
            animation-delay: 3.2s;
            animation-duration: 3.9s;
        }
        .hero-particle:nth-child(8) {
            left: 82%;
            top: 48%;
            animation-delay: 1s;
            animation-duration: 4.6s;
        }

        .hero-content {
            position: relative;
            z-index: 4;
            max-width: 700px;
        }
        .hero-content .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(255, 107, 0, 0.15);
            border: 1px solid rgba(255, 107, 0, 0.35);
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--brand-orange-light);
            letter-spacing: 0.04em;
            margin-bottom: 20px;
        }
        .hero-content h1 {
            font-family: var(--font-heading);
            font-size: 3.6rem;
            font-weight: 700;
            line-height: 1.08;
            letter-spacing: 0.02em;
            margin-bottom: 18px;
            color: #fff;
        }
        .hero-content h1 span {
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-content .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.6;
            max-width: 520px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 15px 32px;
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-xl);
            letter-spacing: 0.04em;
            transition: all var(--transition-smooth);
            box-shadow: 0 6px 24px rgba(255, 107, 0, 0.35);
            position: relative;
            overflow: hidden;
        }
        .btn-primary:hover {
            box-shadow: 0 12px 36px rgba(255, 107, 0, 0.5);
            transform: translateY(-3px);
            animation: pulse-glow 2s ease-in-out infinite;
        }
        .btn-primary:active {
            transform: scale(0.95);
            box-shadow: 0 3px 10px rgba(255, 107, 0, 0.4);
        }
        .btn-primary:focus-visible {
            outline: 3px solid var(--brand-orange);
            outline-offset: 4px;
            border-radius: var(--radius-xl);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            border-radius: var(--radius-xl);
            letter-spacing: 0.04em;
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: all var(--transition-smooth);
        }
        .btn-ghost:hover {
            border-color: var(--brand-orange);
            color: var(--brand-orange-light);
            box-shadow: 0 0 20px rgba(255, 107, 0, 0.2);
            transform: translateY(-2px);
        }
        .btn-ghost:focus-visible {
            outline: 3px solid var(--brand-orange);
            outline-offset: 4px;
            border-radius: var(--radius-xl);
        }

        .features-section {
            background: var(--bg-deep);
            position: relative;
        }
        .features-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 10%;
            right: 10%;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 107, 0, 0.35), rgba(180, 76, 240, 0.25), transparent);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--grid-gap);
            margin-top: 48px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 26px;
            border: 1px solid var(--border-subtle);
            transform: rotate(0.5deg);
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .feature-card:nth-child(even) {
            transform: rotate(-0.4deg);
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, transparent 50%, rgba(255, 107, 0, 0.06) 50%);
            border-radius: 0 0 0 40px;
        }
        .feature-card:hover {
            transform: rotate(0deg) translateY(-6px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-orange);
            background: var(--bg-card-hover);
        }
        .feature-card:nth-child(even):hover {
            transform: rotate(0deg) translateY(-6px);
        }
        .feature-icon-wrap {
            width: 54px;
            height: 54px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 1.5rem;
            background: rgba(255, 107, 0, 0.1);
            color: var(--brand-orange);
            transition: all var(--transition-smooth);
            position: relative;
            z-index: 1;
        }
        .feature-card:hover .feature-icon-wrap {
            background: rgba(255, 107, 0, 0.18);
            color: var(--brand-orange-light);
            box-shadow: 0 0 18px rgba(255, 107, 0, 0.25);
            transform: rotate(-5deg) scale(1.05);
        }
        .feature-card h3 {
            font-family: var(--font-heading);
            font-size: 1.35rem;
            letter-spacing: 0.03em;
            margin-bottom: 8px;
            color: #fff;
            position: relative;
            z-index: 1;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.55;
            position: relative;
            z-index: 1;
        }

        .data-section {
            background: #0d0d0d;
            position: relative;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            isolation: isolate;
        }
        .data-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10, 10, 10, 0.88);
            z-index: 1;
        }
        .data-section .container {
            position: relative;
            z-index: 2;
        }
        .data-speed-lines {
            position: absolute;
            inset: 0;
            z-index: 1;
            pointer-events: none;
            overflow: hidden;
            opacity: 0.25;
        }
        .data-speed-line {
            position: absolute;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 107, 0, 0.6), transparent);
            width: 180px;
            top: 20%;
            left: -200px;
            animation: shimmer-line 3s linear infinite;
        }
        .data-speed-line:nth-child(2) {
            top: 50%;
            animation-delay: 1.2s;
            width: 140px;
        }
        .data-speed-line:nth-child(3) {
            top: 75%;
            animation-delay: 2.5s;
            width: 200px;
        }
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 40px;
        }
        .data-card {
            text-align: center;
            padding: 36px 20px;
            background: rgba(20, 20, 20, 0.7);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 107, 0, 0.15);
            transition: all var(--transition-smooth);
            position: relative;
            -webkit-backdrop-filter: blur(6px);
            backdrop-filter: blur(6px);
        }
        .data-card:hover {
            border-color: rgba(255, 107, 0, 0.45);
            box-shadow: 0 0 30px rgba(255, 107, 0, 0.15);
            transform: translateY(-4px);
        }
        .data-number {
            font-family: var(--font-numbers);
            font-size: 3.2rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.02em;
            line-height: 1;
            margin-bottom: 8px;
        }
        .data-number .data-suffix {
            color: var(--brand-orange);
            font-size: 2rem;
        }
        .data-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            letter-spacing: 0.04em;
            font-weight: 500;
        }

        .cases-section {
            background: var(--bg-deep);
            position: relative;
        }
        .cases-scroll {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .case-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
            cursor: pointer;
        }
        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-orange);
        }
        .case-card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            border-bottom: 2px solid rgba(255, 107, 0, 0.2);
        }
        .case-card-body {
            padding: 18px 16px;
        }
        .case-card-body h4 {
            font-family: var(--font-heading);
            font-size: 1.2rem;
            letter-spacing: 0.03em;
            color: #fff;
            margin-bottom: 6px;
        }
        .case-card-body p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        .case-card-tag {
            display: inline-block;
            font-size: 0.75rem;
            padding: 3px 10px;
            background: rgba(255, 107, 0, 0.15);
            color: var(--brand-orange-light);
            border-radius: var(--radius-full);
            margin-bottom: 8px;
            font-weight: 500;
            letter-spacing: 0.03em;
        }

        .solutions-section {
            background: #0d0d0d;
            position: relative;
        }
        .solutions-section::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 10%;
            right: 10%;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(180, 76, 240, 0.3), rgba(255, 107, 0, 0.25), transparent);
        }
        .steps-container {
            display: flex;
            align-items: flex-start;
            gap: 0;
            margin-top: 48px;
            position: relative;
        }
        .step-item {
            flex: 1;
            text-align: center;
            position: relative;
            padding: 0 16px;
        }
        .step-number {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            color: #fff;
            font-family: var(--font-numbers);
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 auto 16px;
            box-shadow: 0 6px 20px rgba(255, 107, 0, 0.35);
            position: relative;
            z-index: 2;
        }
        .step-connector {
            position: absolute;
            top: 30px;
            left: calc(50% + 30px);
            width: calc(100% - 60px);
            height: 2px;
            background: linear-gradient(90deg, var(--brand-orange), var(--brand-purple));
            z-index: 1;
            opacity: 0.5;
            box-shadow: 0 0 12px rgba(255, 107, 0, 0.3);
        }
        .step-item:last-child .step-connector {
            display: none;
        }
        .step-item h4 {
            font-family: var(--font-heading);
            font-size: 1.25rem;
            letter-spacing: 0.03em;
            color: #fff;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        .faq-section {
            background: var(--bg-deep);
            position: relative;
        }
        .faq-list {
            max-width: 800px;
            margin: 40px auto 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-subtle);
            overflow: hidden;
            transition: all var(--transition-smooth);
        }
        .faq-item.open {
            border-color: rgba(255, 107, 0, 0.35);
            box-shadow: 0 0 20px rgba(255, 107, 0, 0.08);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: #fff;
            letter-spacing: 0.02em;
            transition: color var(--transition-fast);
            user-select: none;
            gap: 16px;
        }
        .faq-question:hover {
            color: var(--brand-orange-light);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(255, 107, 0, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-smooth);
            font-size: 0.9rem;
            color: var(--brand-orange);
        }
        .faq-item.open .faq-icon {
            background: var(--brand-orange);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth), padding var(--transition-smooth);
            padding: 0 22px;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 22px 18px;
        }

        .contact-section {
            background: #0d0d0d;
            position: relative;
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            isolation: isolate;
        }
        .contact-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10, 10, 10, 0.9);
            z-index: 1;
        }
        .contact-section .container {
            position: relative;
            z-index: 2;
        }
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            margin-top: 40px;
            align-items: start;
        }
        .contact-info h3 {
            font-family: var(--font-heading);
            font-size: 1.8rem;
            letter-spacing: 0.03em;
            color: #fff;
            margin-bottom: 12px;
        }
        .contact-info p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.6;
        }
        .contact-detail {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .contact-detail i {
            color: var(--brand-orange);
            width: 20px;
            text-align: center;
        }
        .contact-form {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border-subtle);
            box-shadow: var(--shadow-card);
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-group label {
            display: block;
            margin-bottom: 6px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 13px 16px;
            background: var(--bg-input);
            border: 1px solid #333;
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 0.95rem;
            transition: all var(--transition-smooth);
            resize: vertical;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--brand-orange);
            box-shadow: 0 0 0 4px rgba(255, 107, 0, 0.08), 0 0 18px rgba(255, 107, 0, 0.15);
            outline: none;
        }
        .form-group textarea {
            min-height: 120px;
        }
        .btn-submit {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-xl);
            letter-spacing: 0.04em;
            cursor: pointer;
            transition: all var(--transition-smooth);
            box-shadow: 0 6px 22px rgba(255, 107, 0, 0.3);
            border: none;
        }
        .btn-submit:hover {
            box-shadow: 0 12px 34px rgba(255, 107, 0, 0.5);
            animation: pulse-glow 2s ease-in-out infinite;
            transform: translateY(-2px);
        }
        .btn-submit:active {
            transform: scale(0.96);
        }
        .btn-submit:focus-visible {
            outline: 3px solid var(--brand-orange);
            outline-offset: 3px;
        }

        .footer {
            background: #060606;
            padding: 48px 0 24px;
            border-top: 1px solid rgba(255, 107, 0, 0.1);
            text-align: center;
        }
        .footer-logo {
            font-family: var(--font-heading);
            font-size: 1.5rem;
            letter-spacing: 0.05em;
            color: #fff;
            margin-bottom: 16px;
            display: inline-block;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 28px;
            flex-wrap: wrap;
            margin-bottom: 20px;
            font-size: 0.9rem;
        }
        .footer-links a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--brand-orange-light);
        }
        .footer-copy {
            font-size: 0.8rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .cases-scroll {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .contact-wrapper {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero-content h1 {
                font-size: 2.8rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .nav-links {
                gap: 20px;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .nav-cta-btn {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-card {
                transform: rotate(0deg);
                padding: 24px 18px;
            }
            .feature-card:nth-child(even) {
                transform: rotate(0deg);
            }
            .feature-card:hover {
                transform: translateY(-4px);
            }
            .feature-card:nth-child(even):hover {
                transform: translateY(-4px);
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .data-number {
                font-size: 2.4rem;
            }
            .cases-scroll {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .steps-container {
                flex-direction: column;
                gap: 28px;
            }
            .step-connector {
                display: none;
            }
            .step-item {
                padding: 0;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
            .hero-content .hero-subtitle {
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
            section {
                padding: 64px 0;
            }
            .hero-section {
                min-height: 90vh;
            }
            .contact-form {
                padding: 24px 18px;
            }
        }

        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .data-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .data-number {
                font-size: 2rem;
            }
            .cases-scroll {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .hero-content h1 {
                font-size: 1.8rem;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 12px;
            }
            .btn-primary,
            .btn-ghost {
                width: 100%;
                justify-content: center;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .section-title::after {
                width: 36px;
                height: 2px;
            }
            .nav-logo {
                font-size: 1.3rem;
            }
            .nav-logo .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 1rem;
            }
            .data-card {
                padding: 24px 14px;
            }
            .data-number {
                font-size: 1.8rem;
            }
            .data-number .data-suffix {
                font-size: 1.3rem;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-answer {
                font-size: 0.82rem;
            }
            .footer-links {
                gap: 16px;
                font-size: 0.8rem;
            }
        }