/* roulang page: index */
:root {
            --primary: #00E5FF;
            --primary-rgb: 0, 229, 255;
            --secondary: #7B2FFF;
            --secondary-rgb: 123, 47, 255;
            --accent: #FF3366;
            --accent-rgb: 255, 51, 102;
            --bg-deep: #060913;
            --bg-dark: #0A0E27;
            --bg-card: rgba(10, 15, 40, 0.65);
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-glass-hover: rgba(0, 229, 255, 0.35);
            --text-primary: #ffffff;
            --text-secondary: rgba(255, 255, 255, 0.75);
            --text-muted: rgba(255, 255, 255, 0.5);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 50px;
            --shadow-card: 0 8px 32px rgba(0, 229, 255, 0.08);
            --shadow-card-hover: 0 12px 40px rgba(0, 229, 255, 0.25);
            --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.4);
            --shadow-glow-hover: 0 0 35px rgba(0, 229, 255, 0.7);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --container-max: 1280px;
            --nav-height: 80px;
            --section-pad: 100px;
            --section-pad-mobile: 60px;
            --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: 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

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

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

        body {
            font-family: var(--font-family);
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            overflow-x: hidden;
            background-image:
                radial-gradient(ellipse at 20% 15%, rgba(0, 229, 255, 0.04) 0%, transparent 55%),
                radial-gradient(ellipse at 70% 30%, rgba(123, 47, 255, 0.05) 0%, transparent 55%),
                radial-gradient(ellipse at 45% 65%, rgba(255, 51, 102, 0.03) 0%, transparent 50%);
            background-attachment: fixed;
        }

        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;
            border: none;
            outline: none;
            font-size: inherit;
        }

        button {
            cursor: pointer;
            background: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 32px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 18px;
            }
        }

        /* ============ NAVIGATION ============ */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 40px;
            background: rgba(6, 9, 19, 0.55);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            transition: background var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
        }

        .nav.scrolled {
            background: rgba(6, 9, 19, 0.88);
            border-bottom-color: rgba(0, 229, 255, 0.18);
            box-shadow: 0 2px 28px rgba(0, 229, 255, 0.1);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.35rem;
            letter-spacing: 0.03em;
            color: #fff;
            z-index: 1001;
            flex-shrink: 0;
        }

        .nav-logo svg {
            width: 38px;
            height: 38px;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            font-size: 0.95rem;
        }

        .nav-links a {
            color: rgba(255, 255, 255, 0.78);
            font-weight: 500;
            position: relative;
            padding: 4px 0;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 1px;
            transition: width var(--transition-smooth);
            box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.7);
        }

        .nav-links a:hover,
        .nav-links a:focus-visible {
            color: var(--primary);
        }

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

        .nav-cta {
            display: inline-flex;
            align-items: center;
            padding: 12px 28px;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.02em;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-smooth);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .nav-cta:hover {
            box-shadow: var(--shadow-glow-hover);
            transform: translateY(-1px);
        }

        .nav-hamburger {
            display: none;
            flex-direction: column;
            gap: 6px;
            cursor: pointer;
            z-index: 1001;
            padding: 8px;
            background: none;
            border: none;
        }

        .nav-hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all var(--transition-fast);
        }

        .nav-hamburger.active span:nth-child(1) {
            transform: translateY(8.5px) rotate(45deg);
        }
        .nav-hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .nav-hamburger.active span:nth-child(3) {
            transform: translateY(-8.5px) rotate(-45deg);
        }

        @media (max-width: 1024px) {
            .nav {
                padding: 0 22px;
            }
            .nav-links {
                gap: 20px;
                font-size: 0.88rem;
            }
            .nav-cta {
                padding: 10px 20px;
                font-size: 0.82rem;
            }
        }

        @media (max-width: 768px) {
            .nav-hamburger {
                display: flex;
            }
            .nav-links {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(6, 9, 19, 0.95);
                backdrop-filter: blur(30px);
                -webkit-backdrop-filter: blur(30px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 36px;
                font-size: 1.5rem;
                opacity: 0;
                pointer-events: none;
                transform: translateY(-10px);
                transition: all var(--transition-smooth);
                z-index: 1000;
            }
            .nav-links.active {
                opacity: 1;
                pointer-events: all;
                transform: translateY(0);
            }
            .nav-links a {
                font-size: 1.4rem;
                font-weight: 600;
                color: rgba(255, 255, 255, 0.9);
            }
            .nav-cta.desktop-only {
                display: none;
            }
            .nav-links .nav-cta-mobile {
                display: inline-flex;
                margin-top: 12px;
                padding: 14px 36px;
                font-size: 1rem;
                background: linear-gradient(135deg, var(--primary), var(--secondary));
                color: #fff;
                border-radius: var(--radius-xl);
                font-weight: 600;
                box-shadow: var(--shadow-glow);
            }
        }

        @media (min-width: 769px) {
            .nav-links .nav-cta-mobile {
                display: none;
            }
        }

        /* ============ HERO ============ */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            overflow: hidden;
            padding-top: var(--nav-height);
            background:
                radial-gradient(ellipse at 30% 20%, rgba(0, 229, 255, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 65% 40%, rgba(123, 47, 255, 0.12) 0%, transparent 50%),
                radial-gradient(ellipse at 40% 70%, rgba(255, 51, 102, 0.06) 0%, transparent 45%);
            background-color: var(--bg-deep);
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background:
                radial-gradient(circle at 25% 30%, rgba(0, 229, 255, 0.06) 0%, transparent 40%),
                radial-gradient(circle at 60% 20%, rgba(123, 47, 255, 0.07) 0%, transparent 35%),
                radial-gradient(circle at 70% 55%, rgba(0, 229, 255, 0.04) 0%, transparent 30%);
            animation: heroGlow 8s ease-in-out infinite alternate;
            pointer-events: none;
            z-index: 0;
        }

        @keyframes heroGlow {
            0% {
                opacity: 0.7;
                transform: scale(1);
            }
            50% {
                opacity: 1;
                transform: scale(1.08);
            }
            100% {
                opacity: 0.75;
                transform: scale(1.03);
            }
        }

        .hero-clouds {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            pointer-events: none;
            z-index: 0;
            opacity: 0.35;
            background:
                radial-gradient(ellipse 280px 120px at 15% 25%, rgba(0, 229, 255, 0.13), transparent),
                radial-gradient(ellipse 340px 140px at 55% 18%, rgba(123, 47, 255, 0.15), transparent),
                radial-gradient(ellipse 260px 100px at 75% 35%, rgba(0, 229, 255, 0.1), transparent),
                radial-gradient(ellipse 300px 130px at 30% 55%, rgba(255, 51, 102, 0.08), transparent),
                radial-gradient(ellipse 220px 90px at 65% 60%, rgba(0, 229, 255, 0.09), transparent);
            animation: cloudDrift 12s ease-in-out infinite alternate;
        }

        @keyframes cloudDrift {
            0% {
                transform: translateX(-20px) translateY(0);
                opacity: 0.3;
            }
            33% {
                transform: translateX(10px) translateY(-15px);
                opacity: 0.45;
            }
            66% {
                transform: translateX(-5px) translateY(5px);
                opacity: 0.35;
            }
            100% {
                transform: translateX(18px) translateY(-8px);
                opacity: 0.42;
            }
        }

        .hero-particles {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            pointer-events: none;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 820px;
            padding: 40px 24px;
        }

        .hero-breadcrumb {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.45);
            margin-bottom: 20px;
            letter-spacing: 0.04em;
        }
        .hero-breadcrumb span.current {
            color: var(--primary);
            font-weight: 500;
        }

        .hero-badge {
            display: inline-block;
            padding: 8px 20px;
            border-radius: var(--radius-xl);
            background: rgba(0, 229, 255, 0.1);
            border: 1px solid rgba(0, 229, 255, 0.25);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            margin-bottom: 28px;
            animation: badgePulse 2.5s ease-in-out infinite;
        }

        @keyframes badgePulse {
            0%,
            100% {
                box-shadow: 0 0 8px rgba(0, 229, 255, 0.2);
            }
            50% {
                box-shadow: 0 0 22px rgba(0, 229, 255, 0.45);
            }
        }

        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: 0.02em;
            background: linear-gradient(135deg, #00E5FF 0%, #7B2FFF 50%, #00E5FF 100%);
            background-size: 200% 200%;
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: none;
            filter: drop-shadow(0 0 18px rgba(0, 229, 255, 0.5));
            animation: titleShimmer 5s ease-in-out infinite;
            margin-bottom: 20px;
        }

        @keyframes titleShimmer {
            0%,
            100% {
                background-position: 0% 50%;
            }
            50% {
                background-position: 100% 50%;
            }
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.7;
            letter-spacing: 0.03em;
        }

        .hero-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 15px 34px;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.03em;
            background: linear-gradient(135deg, #00E5FF, #7B2FFF);
            color: #fff;
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-smooth);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-glow-hover);
            transform: translateY(-2px);
            background: linear-gradient(135deg, #1aeaff, #8f4fff);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.03em;
            background: transparent;
            color: #fff;
            border: 2px solid var(--primary);
            box-shadow: 0 0 8px rgba(0, 229, 255, 0.2);
            transition: all var(--transition-smooth);
            cursor: pointer;
        }
        .btn-outline:hover {
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.5);
            border-color: #fff;
            background: rgba(0, 229, 255, 0.08);
            transform: translateY(-2px);
        }

        .hero-scroll-indicator {
            position: absolute;
            bottom: 36px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.75rem;
            letter-spacing: 0.08em;
            animation: bounceDown 2s ease-in-out infinite;
        }
        .hero-scroll-indicator .arrow {
            width: 18px;
            height: 18px;
            border-right: 2px solid rgba(255, 255, 255, 0.5);
            border-bottom: 2px solid rgba(255, 255, 255, 0.5);
            transform: rotate(45deg);
        }

        @keyframes bounceDown {
            0%,
            100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(14px);
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 12px;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
                padding: 14px 24px;
                font-size: 0.95rem;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.75rem;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .hero-badge {
                font-size: 0.75rem;
                padding: 6px 14px;
            }
        }

        /* ============ SECTIONS COMMON ============ */
        .section {
            padding: var(--section-pad) 0;
            position: relative;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--primary);
            text-transform: uppercase;
            margin-bottom: 10px;
            padding: 4px 14px;
            border-radius: var(--radius-xl);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            letter-spacing: 0.02em;
            margin-bottom: 16px;
            color: #fff;
        }
        .section-desc {
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.05rem;
            max-width: 640px;
            line-height: 1.7;
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header .section-desc {
            margin: 0 auto;
        }

        @media (max-width: 640px) {
            .section {
                padding: var(--section-pad-mobile) 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .section-desc {
                font-size: 0.9rem;
            }
            .section-header {
                margin-bottom: 36px;
            }
        }

        /* ============ SERVICES ============ */
        #services {
            background: var(--bg-deep);
            position: relative;
        }
        #services::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background:
                radial-gradient(ellipse at 70% 20%, rgba(0, 229, 255, 0.03) 0%, transparent 50%),
                radial-gradient(ellipse at 20% 70%, rgba(123, 47, 255, 0.04) 0%, transparent 50%);
            pointer-events: none;
        }

        .services-grid {
            display: grid;
            grid-template-columns: 1.3fr 1fr;
            grid-template-rows: auto auto;
            gap: 24px;
            position: relative;
            z-index: 1;
        }
        .service-card {
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 36px 30px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 50% 50%, rgba(0, 229, 255, 0.05), transparent 70%);
            opacity: 0;
            transition: opacity var(--transition-smooth);
            pointer-events: none;
        }
        .service-card:hover {
            border-color: var(--border-glass-hover);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .service-card:hover::before {
            opacity: 1;
        }
        .service-card.card-large {
            grid-row: span 2;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            gap: 20px;
        }
        .service-card.card-large .service-icon-wrap {
            width: 64px;
            height: 64px;
        }
        .service-card.card-large .service-card-title {
            font-size: 1.7rem;
        }
        .service-icon-wrap {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(0, 229, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .service-card-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.02em;
        }
        .service-card-desc {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .service-card-features {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
        }
        .service-tag {
            display: inline-block;
            padding: 5px 12px;
            border-radius: var(--radius-xl);
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(0, 229, 255, 0.08);
            color: var(--primary);
            border: 1px solid rgba(0, 229, 255, 0.18);
        }

        @media (max-width: 768px) {
            .services-grid {
                grid-template-columns: 1fr;
                grid-template-rows: auto;
            }
            .service-card.card-large {
                grid-row: span 1;
            }
            .service-card {
                padding: 28px 22px;
            }
            .service-card.card-large .service-card-title {
                font-size: 1.35rem;
            }
        }

        /* ============ ADVANTAGES ============ */
        #advantages {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        #advantages::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 48px 48px;
            pointer-events: none;
            z-index: 0;
        }
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            position: relative;
            z-index: 1;
        }
        .advantage-item {
            text-align: center;
            padding: 32px 20px;
            border-radius: var(--radius-md);
            background: rgba(10, 15, 40, 0.5);
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: all var(--transition-smooth);
            position: relative;
        }
        .advantage-item:hover {
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.1);
            transform: translateY(-4px);
        }
        .advantage-number {
            font-size: 3.5rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(180deg, #00E5FF 0%, #7B2FFF 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            filter: drop-shadow(0 0 12px rgba(0, 229, 255, 0.5));
            line-height: 1;
            margin-bottom: 8px;
            font-variant-numeric: tabular-nums;
            font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
        }
        .advantage-label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
            letter-spacing: 0.03em;
        }

        @media (max-width: 1024px) {
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .advantage-number {
                font-size: 2.8rem;
            }
        }
        @media (max-width: 520px) {
            .advantages-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .advantage-item {
                padding: 22px 14px;
            }
            .advantage-number {
                font-size: 2.2rem;
            }
            .advantage-label {
                font-size: 0.8rem;
            }
        }

        /* ============ CASES ============ */
        #cases {
            background: var(--bg-deep);
            position: relative;
        }
        .cases-scroll-wrapper {
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            cursor: grab;
            padding-bottom: 20px;
            scrollbar-width: thin;
            scrollbar-color: rgba(0, 229, 255, 0.2) transparent;
            position: relative;
            z-index: 1;
        }
        .cases-scroll-wrapper::-webkit-scrollbar {
            height: 6px;
        }
        .cases-scroll-wrapper::-webkit-scrollbar-track {
            background: transparent;
            border-radius: 3px;
        }
        .cases-scroll-wrapper::-webkit-scrollbar-thumb {
            background: rgba(0, 229, 255, 0.25);
            border-radius: 3px;
        }
        .cases-scroll-wrapper.dragging {
            cursor: grabbing;
            scroll-snap-type: none;
        }
        .cases-track {
            display: flex;
            gap: 24px;
            padding: 8px 0;
            min-width: min-content;
        }
        .case-card {
            flex: 0 0 320px;
            scroll-snap-align: start;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .case-card:hover {
            border-color: var(--border-glass-hover);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-6px);
        }
        .case-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            background: rgba(0, 229, 255, 0.05);
        }
        .case-card-body {
            padding: 20px 18px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .case-card-tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 0.05em;
            background: rgba(0, 229, 255, 0.1);
            padding: 3px 10px;
            border-radius: var(--radius-xl);
            align-self: flex-start;
        }
        .case-card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.02em;
        }
        .case-card-date {
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .case-card-highlight {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.5;
        }

        @media (max-width: 768px) {
            .cases-track {
                flex-direction: column;
                gap: 16px;
                padding: 0;
            }
            .case-card {
                flex: 0 0 auto;
                width: 100%;
            }
            .cases-scroll-wrapper {
                overflow-x: hidden;
                cursor: default;
                padding-bottom: 0;
            }
            .case-card:hover {
                transform: translateY(-3px);
            }
        }

        /* ============ SOLUTIONS ============ */
        #solutions {
            background: var(--bg-dark);
            position: relative;
        }
        #solutions::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 50% 30%, rgba(123, 47, 255, 0.04) 0%, transparent 60%);
            pointer-events: none;
        }
        .solutions-tabs {
            display: flex;
            gap: 0;
            justify-content: center;
            margin-bottom: 36px;
            position: relative;
            z-index: 1;
            flex-wrap: wrap;
            background: rgba(10, 15, 40, 0.5);
            border-radius: var(--radius-xl);
            padding: 6px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            display: inline-flex;
            margin-left: auto;
            margin-right: auto;
            width: fit-content;
        }
        .solutions-tab-btn {
            padding: 12px 28px;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.03em;
            color: rgba(255, 255, 255, 0.65);
            transition: all var(--transition-smooth);
            cursor: pointer;
            border: none;
            background: transparent;
            white-space: nowrap;
        }
        .solutions-tab-btn.active {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(123, 47, 255, 0.2));
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.25);
        }
        .solutions-tab-btn:hover:not(.active) {
            color: rgba(255, 255, 255, 0.9);
            background: rgba(255, 255, 255, 0.04);
        }
        .solutions-panel {
            display: none;
            position: relative;
            z-index: 1;
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 40px 32px;
            animation: fadeSlideIn 0.4s ease-out;
            box-shadow: var(--shadow-card);
        }
        .solutions-panel.active {
            display: block;
        }
        @keyframes fadeSlideIn {
            from {
                opacity: 0;
                transform: translateY(14px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .solutions-panel-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }
        .solutions-panel-desc {
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .solutions-feature-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 24px;
        }
        .solutions-feature-item {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            background: rgba(0, 229, 255, 0.06);
            border: 1px solid rgba(0, 229, 255, 0.15);
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.8);
            font-weight: 500;
        }
        .solutions-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.03em;
            background: linear-gradient(135deg, #00E5FF, #7B2FFF);
            color: #fff;
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-smooth);
            cursor: pointer;
            border: none;
        }
        .solutions-cta:hover {
            box-shadow: var(--shadow-glow-hover);
            transform: translateY(-2px);
        }

        @media (max-width: 640px) {
            .solutions-tabs {
                flex-direction: column;
                width: 100%;
                border-radius: var(--radius-md);
                padding: 4px;
                gap: 4px;
            }
            .solutions-tab-btn {
                width: 100%;
                text-align: center;
                padding: 10px 20px;
                font-size: 0.85rem;
            }
            .solutions-panel {
                padding: 24px 18px;
            }
            .solutions-panel-title {
                font-size: 1.25rem;
            }
        }

        /* ============ FAQ ============ */
        #faq {
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
        }
        #faq::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: radial-gradient(ellipse at 50% 100%, rgba(0, 229, 255, 0.03) 0%, transparent 60%);
            pointer-events: none;
        }
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            position: relative;
            z-index: 1;
        }
        .faq-col {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: rgba(10, 15, 40, 0.55);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-smooth);
        }
        .faq-item.open {
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.08);
        }
        .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 1rem;
            color: #fff;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            letter-spacing: 0.02em;
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-arrow {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform var(--transition-smooth);
            position: relative;
        }
        .faq-arrow::before,
        .faq-arrow::after {
            content: '';
            position: absolute;
            background: var(--primary);
            border-radius: 1px;
            transition: all var(--transition-smooth);
        }
        .faq-arrow::before {
            width: 10px;
            height: 2px;
            top: 9px;
            left: 5px;
        }
        .faq-arrow::after {
            width: 2px;
            height: 10px;
            top: 5px;
            left: 9px;
        }
        .faq-item.open .faq-arrow::after {
            transform: rotate(90deg);
            opacity: 0;
        }
        .faq-answer-wrap {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth);
        }
        .faq-item.open .faq-answer-wrap {
            max-height: 300px;
        }
        .faq-answer {
            padding: 0 22px 20px;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            line-height: 1.7;
        }
        .faq-answer a {
            color: var(--primary);
            font-weight: 500;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .faq-answer a:hover {
            color: #fff;
        }

        @media (max-width: 768px) {
            .faq-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
        }

        /* ============ CONTACT ============ */
        #contact {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        #contact::before {
            content: '';
            position: absolute;
            top: -30%;
            left: -20%;
            width: 80%;
            height: 160%;
            background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.06) 0%, transparent 70%);
            pointer-events: none;
            animation: contactGlow 6s ease-in-out infinite alternate;
        }
        @keyframes contactGlow {
            0% {
                opacity: 0.6;
                transform: scale(1);
            }
            100% {
                opacity: 1;
                transform: scale(1.12);
            }
        }
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: start;
            position: relative;
            z-index: 1;
        }
        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 14px 18px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.14);
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            resize: vertical;
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
            background: rgba(255, 255, 255, 0.06);
            outline: none;
        }
        .contact-form input::placeholder,
        .contact-form textarea::placeholder {
            color: rgba(255, 255, 255, 0.35);
        }
        .contact-form textarea {
            min-height: 120px;
        }
        .contact-submit {
            padding: 15px 34px;
            border-radius: var(--radius-xl);
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.03em;
            background: linear-gradient(135deg, #00E5FF, #7B2FFF);
            color: #fff;
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-smooth);
            cursor: pointer;
            border: none;
            align-self: flex-start;
        }
        .contact-submit:hover {
            box-shadow: var(--shadow-glow-hover);
            transform: translateY(-2px);
            background: linear-gradient(135deg, #1aeaff, #8f4fff);
        }
        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .contact-info-title {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.02em;
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        .contact-info-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            margin-top: 2px;
            color: var(--primary);
        }
        .contact-social-icons {
            display: flex;
            gap: 16px;
            margin-top: 8px;
        }
        .contact-social-icons a {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
            color: rgba(255, 255, 255, 0.6);
        }
        .contact-social-icons a:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.3);
            background: rgba(0, 229, 255, 0.08);
        }

        @media (max-width: 768px) {
            .contact-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .contact-submit {
                width: 100%;
                justify-content: center;
            }
        }

        /* ============ FOOTER ============ */
        .footer {
            background: #040812;
            padding: 28px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }
        .footer-copyright {
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.85rem;
            letter-spacing: 0.04em;
        }
        .footer-domain {
            color: rgba(255, 255, 255, 0.3);
            font-size: 0.78rem;
        }
        .footer-beian {
            color: rgba(255, 255, 255, 0.25);
            font-size: 0.75rem;
        }

        /* ============ UTILITY ============ */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        ::selection {
            background: rgba(0, 229, 255, 0.3);
            color: #fff;
        }
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 2px;
        }