/* roulang page: index */
:root {
            --bg-deep: #0B0E1A;
            --bg-mid: #111B3D;
            --bg-card: rgba(255, 255, 255, 0.04);
            --bg-card-hover: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.12);
            --border-card-hover: rgba(255, 255, 255, 0.28);
            --brand-blue: #1E90FF;
            --brand-blue-glow: rgba(30, 144, 255, 0.55);
            --brand-cyan: #00F0FF;
            --brand-cyan-glow: rgba(0, 240, 255, 0.5);
            --brand-magenta: #FF0055;
            --brand-magenta-glow: rgba(255, 0, 85, 0.45);
            --text-primary: #FFFFFF;
            --text-secondary: rgba(255, 255, 255, 0.82);
            --text-muted: rgba(255, 255, 255, 0.55);
            --text-onyx: rgba(255, 255, 255, 0.35);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-pill: 30px;
            --radius-sm: 8px;
            --shadow-glow-blue: 0 0 28px rgba(30, 144, 255, 0.6);
            --shadow-glow-cyan: 0 0 24px rgba(0, 240, 255, 0.5);
            --shadow-glow-magenta: 0 0 22px rgba(255, 0, 85, 0.4);
            --shadow-card-hover: 0 8px 36px rgba(0, 240, 255, 0.18);
            --spacing-section: 100px;
            --spacing-card-pad: 28px;
            --transition-fast: 0.25s ease;
            --transition-smooth: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-h1: 52px;
            --font-h2: 36px;
            --font-h3: 22px;
            --font-body: 15px;
            --font-sm: 13px;
            --nav-height: 64px;
        }

        *,
        *::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: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Segoe UI', sans-serif;
            font-size: var(--font-body);
            line-height: 1.7;
            color: var(--text-secondary);
            background: var(--bg-deep);
            background-image:
                radial-gradient(ellipse at 20% 10%, rgba(30, 144, 255, 0.08) 0%, transparent 65%),
                radial-gradient(ellipse at 75% 18%, rgba(0, 240, 255, 0.06) 0%, transparent 60%),
                radial-gradient(ellipse at 50% 60%, rgba(255, 0, 85, 0.04) 0%, transparent 55%),
                radial-gradient(ellipse at 85% 80%, rgba(30, 144, 255, 0.05) 0%, transparent 50%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
        }
        input {
            color: var(--text-primary);
            background: transparent;
        }
        ul {
            list-style: none;
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth), backdrop-filter var(--transition-smooth);
            background: transparent;
            backdrop-filter: blur(0px);
            -webkit-backdrop-filter: blur(0px);
            border-bottom: 1px solid transparent;
        }
        .site-header.scrolled {
            background: rgba(11, 14, 26, 0.75);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.35);
        }
        .header-inner {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
            z-index: 1002;
        }
        .logo-text {
            font-size: 20px;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: #fff;
            white-space: nowrap;
        }
        .logo-text .logo-highlight {
            color: var(--brand-cyan);
            font-weight: 900;
        }
        .logo-sub {
            font-size: 10px;
            font-weight: 500;
            letter-spacing: 1.8px;
            color: var(--text-muted);
            text-transform: uppercase;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .nav-links a {
            display: inline-block;
            padding: 8px 15px;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.6px;
            color: rgba(255, 255, 255, 0.85);
            border-radius: 6px;
            transition: color var(--transition-fast), background var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a:focus-visible {
            color: #fff;
            background: rgba(255, 255, 255, 0.07);
        }
        .nav-links a.nav-active {
            color: var(--brand-cyan);
            background: rgba(0, 240, 255, 0.08);
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.8px;
            color: #fff;
            background: var(--brand-blue);
            border-radius: var(--radius-pill);
            box-shadow: 0 0 18px var(--brand-blue-glow);
            transition: all var(--transition-fast);
            white-space: nowrap;
            margin-left: 6px;
        }
        .nav-cta-btn:hover {
            box-shadow: 0 0 32px var(--brand-blue-glow), 0 0 50px rgba(30, 144, 255, 0.35);
            transform: translateY(-1px);
            background: #2a9fff;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1003;
            padding: 6px;
            background: transparent;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all var(--transition-fast);
            transform-origin: center;
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }
        .mobile-nav-panel {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 1001;
            background: rgba(11, 14, 26, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 18px;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-smooth);
        }
        .mobile-nav-panel.open {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-nav-panel a {
            font-size: 20px;
            font-weight: 700;
            color: rgba(255, 255, 255, 0.9);
            letter-spacing: 1px;
            padding: 10px 20px;
            border-radius: 8px;
            transition: all var(--transition-fast);
        }
        .mobile-nav-panel a:hover {
            color: var(--brand-cyan);
            background: rgba(0, 240, 255, 0.06);
        }
        .mobile-nav-panel .nav-cta-btn-mobile {
            margin-top: 10px;
            font-size: 15px;
            padding: 13px 30px;
        }

        /* ========== HERO ========== */
        .hero-section {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            background-blend-mode: overlay;
            background-color: rgba(11, 14, 26, 0.55);
        }
        .hero-canvas {
            position: absolute;
            inset: 0;
            z-index: 1;
            pointer-events: none;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            z-index: 2;
            background: radial-gradient(ellipse at 35% 50%, rgba(0, 240, 255, 0.07) 0%, transparent 60%),
                radial-gradient(ellipse at 65% 40%, rgba(30, 144, 255, 0.06) 0%, transparent 55%),
                radial-gradient(ellipse at 50% 80%, rgba(255, 0, 85, 0.04) 0%, transparent 50%);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 3;
            text-align: center;
            max-width: 800px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-block;
            padding: 7px 18px;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--brand-cyan);
            border: 1px solid rgba(0, 240, 255, 0.35);
            border-radius: var(--radius-pill);
            background: rgba(0, 240, 255, 0.06);
            margin-bottom: 20px;
            animation: badgePulse 3s ease-in-out infinite;
        }
        @keyframes badgePulse {
            0%,
            100% {
                box-shadow: 0 0 8px rgba(0, 240, 255, 0.2);
            }
            50% {
                box-shadow: 0 0 22px rgba(0, 240, 255, 0.45);
            }
        }
        .hero-title {
            font-size: var(--font-h1);
            font-weight: 900;
            line-height: 1.15;
            color: #fff;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
        }
        .hero-title .hl-cyan {
            color: var(--brand-cyan);
            text-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
        }
        .hero-title .hl-white {
            color: #fff;
        }
        .hero-subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.72);
            max-width: 560px;
            margin: 0 auto 32px;
            letter-spacing: 0.3px;
            line-height: 1.6;
        }
        .hero-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 15px;
            font-weight: 700;
            letter-spacing: 0.6px;
            color: #fff;
            background: var(--brand-blue);
            border-radius: var(--radius-pill);
            box-shadow: 0 0 22px var(--brand-blue-glow);
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            box-shadow: 0 0 38px var(--brand-blue-glow), 0 0 60px rgba(30, 144, 255, 0.4);
            transform: translateY(-2px);
            background: #2a9fff;
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 15px;
            font-weight: 700;
            letter-spacing: 0.6px;
            color: #fff;
            background: transparent;
            border: 1.5px solid rgba(0, 240, 255, 0.55);
            border-radius: var(--radius-pill);
            transition: all var(--transition-fast);
            cursor: pointer;
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.15);
        }
        .btn-ghost:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--brand-cyan);
            box-shadow: 0 0 28px var(--brand-cyan-glow);
            transform: translateY(-2px);
        }
        .btn-primary:focus-visible,
        .btn-ghost:focus-visible {
            outline: 2px solid var(--brand-cyan);
            outline-offset: 3px;
        }
        .hero-scroll-hint {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 3;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            animation: floatDown 2s ease-in-out infinite;
            color: rgba(255, 255, 255, 0.5);
            font-size: 11px;
            letter-spacing: 1px;
        }
        @keyframes floatDown {
            0%,
            100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(8px);
            }
        }
        .hero-scroll-hint i {
            font-size: 18px;
        }

        /* ========== SECTIONS ========== */
        .section {
            padding: var(--spacing-section) 24px;
        }
        .section-inner {
            max-width: 1200px;
            margin: 0 auto;
        }
        .section-label {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--brand-cyan);
            margin-bottom: 10px;
        }
        .section-title {
            font-size: var(--font-h2);
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.3px;
            margin-bottom: 10px;
            line-height: 1.25;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin-bottom: 40px;
            line-height: 1.6;
        }
        .section-title.centered,
        .section-desc.centered {
            text-align: center;
            margin-left: auto;
            margin-right: auto;
        }
        .text-center {
            text-align: center;
        }

        /* ========== FEATURES GRID ========== */
        .features-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            grid-template-rows: auto auto;
            gap: 22px;
            align-items: stretch;
        }
        .feature-card-main {
            grid-row: 1 / 3;
            grid-column: 1 / 2;
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: var(--spacing-card-pad);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            display: flex;
            flex-direction: column;
            gap: 16px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            background-image: url('/assets/images/coverpic/cover-4.webp');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            background-color: rgba(11, 14, 26, 0.65);
            min-height: 380px;
        }
        .feature-card-main:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-card-hover);
        }
        .feature-card-main .fc-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 14, 26, 0.5) 0%, rgba(11, 14, 26, 0.85) 100%);
            border-radius: var(--radius-lg);
            pointer-events: none;
        }
        .feature-card-main .fc-content {
            position: relative;
            z-index: 1;
            margin-top: auto;
            padding-top: 60px;
        }
        .feature-card-main .fc-icon-circle {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--brand-cyan);
            margin-bottom: 12px;
        }
        .feature-card-main h3 {
            font-size: var(--font-h3);
            font-weight: 700;
            color: #fff;
            margin-bottom: 6px;
        }
        .feature-card-main p {
            font-size: var(--font-body);
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.55;
            max-width: 280px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: var(--spacing-card-pad);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            display: flex;
            flex-direction: column;
            gap: 10px;
            transition: all var(--transition-smooth);
            position: relative;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-card-hover);
            background: var(--bg-card-hover);
        }
        .feature-card .fc-icon-circle {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: rgba(30, 144, 255, 0.1);
            border: 1px solid rgba(30, 144, 255, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--brand-blue);
            flex-shrink: 0;
        }
        .feature-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            line-height: 1.3;
        }
        .feature-card p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.5;
        }

        /* ========== SCENARIOS ========== */
        .scenarios-scroll {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding-bottom: 12px;
            scroll-snap-type: x proximity;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
        }
        .scenarios-scroll::-webkit-scrollbar {
            height: 5px;
        }
        .scenarios-scroll::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.25);
            border-radius: 10px;
        }
        .scenario-card {
            flex: 0 0 300px;
            scroll-snap-align: start;
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            transition: all var(--transition-smooth);
            flex-shrink: 0;
        }
        .scenario-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-card-hover);
        }
        .scenario-card img {
            width: 100%;
            height: 190px;
            object-fit: cover;
            border-bottom: 1px solid var(--border-card);
        }
        .scenario-card .sc-info {
            padding: 18px 20px;
        }
        .scenario-card .sc-info h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 5px;
        }
        .scenario-card .sc-info p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ========== CASES / DATA ========== */
        .cases-section {
            position: relative;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            background-blend-mode: overlay;
            background-color: rgba(11, 14, 26, 0.7);
            padding: var(--spacing-section) 24px;
        }
        .cases-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 240, 255, 0.06) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 40%, rgba(30, 144, 255, 0.05) 0%, transparent 55%);
            pointer-events: none;
        }
        .cases-inner {
            position: relative;
            z-index: 1;
            max-width: 1200px;
            margin: 0 auto;
        }
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .data-card {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 30px 20px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: all var(--transition-smooth);
        }
        .data-card:hover {
            border-color: var(--border-card-hover);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .data-number {
            font-size: 44px;
            font-weight: 900;
            letter-spacing: -1px;
            background: linear-gradient(135deg, var(--brand-cyan) 0%, var(--brand-blue) 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 6px;
            line-height: 1.1;
        }
        .data-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
            letter-spacing: 0.5px;
        }
        .partner-logos {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            justify-content: center;
            align-items: center;
            margin-top: 40px;
            opacity: 0.55;
            filter: grayscale(0.3);
        }
        .partner-logos span {
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 2px;
            color: rgba(255, 255, 255, 0.5);
            white-space: nowrap;
        }

        /* ========== PRICING ========== */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }
        .pricing-card {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 30px 26px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: all var(--transition-smooth);
            display: flex;
            flex-direction: column;
            gap: 16px;
            position: relative;
        }
        .pricing-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-card-hover);
        }
        .pricing-card.featured {
            border-color: rgba(0, 240, 255, 0.4);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.12);
            background: rgba(0, 240, 255, 0.04);
        }
        .pricing-badge {
            position: absolute;
            top: -12px;
            right: 20px;
            background: var(--brand-magenta);
            color: #fff;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 1px;
            padding: 5px 14px;
            border-radius: var(--radius-pill);
            box-shadow: 0 0 16px var(--brand-magenta-glow);
        }
        .pricing-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
        }
        .pricing-price {
            font-size: 40px;
            font-weight: 900;
            color: #fff;
            letter-spacing: -1px;
        }
        .pricing-price .currency {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-muted);
        }
        .pricing-price .period {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-muted);
        }
        .pricing-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .pricing-features li {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .pricing-features li i {
            color: var(--brand-cyan);
            font-size: 13px;
        }
        .pricing-card .btn-primary {
            width: 100%;
            justify-content: center;
            margin-top: auto;
        }

        /* ========== PROCESS ========== */
        .process-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .process-item {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 26px 20px;
            text-align: center;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            transition: all var(--transition-smooth);
            position: relative;
        }
        .process-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-card-hover);
        }
        .process-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(30, 144, 255, 0.15);
            border: 1.5px solid rgba(30, 144, 255, 0.35);
            font-size: 20px;
            font-weight: 900;
            color: var(--brand-blue);
            margin-bottom: 12px;
        }
        .process-item h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .process-item p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: rgba(255, 255, 255, 0.025);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item[open] {
            border-color: rgba(0, 240, 255, 0.35);
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.08);
            background: rgba(0, 240, 255, 0.03);
        }
        .faq-item summary {
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            list-style: none;
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary:hover {
            color: var(--brand-cyan);
        }
        .faq-item summary .faq-icon {
            flex-shrink: 0;
            font-size: 14px;
            color: var(--brand-cyan);
            transition: transform var(--transition-fast);
            width: 22px;
            height: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.1);
        }
        .faq-item[open] summary .faq-icon {
            transform: rotate(45deg);
            background: rgba(0, 240, 255, 0.2);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
        }

        /* ========== CTA ========== */
        .cta-section {
            position: relative;
            background: url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
            background-blend-mode: overlay;
            background-color: rgba(11, 14, 26, 0.65);
            padding: var(--spacing-section) 24px;
            text-align: center;
        }
        .cta-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 40%, rgba(30, 144, 255, 0.08) 0%, transparent 55%);
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 1;
            max-width: 650px;
            margin: 0 auto;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 24px auto 0;
            flex-wrap: wrap;
            justify-content: center;
        }
        .cta-input {
            flex: 1;
            min-width: 220px;
            padding: 14px 20px;
            font-size: 15px;
            border-radius: var(--radius-pill);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            transition: all var(--transition-fast);
            letter-spacing: 0.3px;
        }
        .cta-input::placeholder {
            color: rgba(255, 255, 255, 0.4);
        }
        .cta-input:focus {
            border-color: var(--brand-cyan);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
            background: rgba(255, 255, 255, 0.09);
            outline: none;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: rgba(11, 14, 26, 0.9);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 40px 24px 28px;
            text-align: center;
        }
        .footer-inner {
            max-width: 800px;
            margin: 0 auto;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            margin-bottom: 10px;
        }
        .footer-logo .hl-cyan {
            color: var(--brand-cyan);
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            margin-bottom: 16px;
        }
        .footer-links a {
            font-size: 13px;
            color: var(--text-muted);
            transition: color var(--transition-fast);
            letter-spacing: 0.4px;
        }
        .footer-links a:hover {
            color: var(--brand-cyan);
        }
        .footer-social {
            display: flex;
            gap: 16px;
            justify-content: center;
            margin-bottom: 14px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text-muted);
            font-size: 15px;
            transition: all var(--transition-fast);
        }
        .footer-social a:hover {
            background: rgba(0, 240, 255, 0.12);
            border-color: rgba(0, 240, 255, 0.35);
            color: var(--brand-cyan);
            box-shadow: 0 0 14px rgba(0, 240, 255, 0.2);
        }
        .footer-copy {
            font-size: 12px;
            color: var(--text-onyx);
            letter-spacing: 0.4px;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            :root {
                --font-h1: 42px;
                --font-h2: 30px;
                --spacing-section: 70px;
                --spacing-card-pad: 22px;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                grid-template-rows: auto;
            }
            .feature-card-main {
                grid-row: auto;
                grid-column: 1 / -1;
                min-height: 280px;
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .pricing-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .pricing-card.featured {
                grid-column: 1 / -1;
            }
            .process-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-title {
                font-size: 38px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --font-h1: 32px;
                --font-h2: 26px;
                --font-h3: 18px;
                --spacing-section: 50px;
                --spacing-card-pad: 18px;
                --nav-height: 56px;
            }
            .nav-links {
                display: none;
            }
            .nav-cta-btn {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-nav-panel {
                display: flex;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .feature-card-main {
                min-height: 240px;
            }
            .scenario-card {
                flex: 0 0 250px;
            }
            .data-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .data-number {
                font-size: 34px;
            }
            .pricing-grid {
                grid-template-columns: 1fr;
            }
            .process-list {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary,
            .btn-ghost {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
            .cta-form {
                flex-direction: column;
                align-items: center;
            }
            .cta-input {
                width: 100%;
                max-width: 380px;
            }
            .section-title {
                font-size: 24px;
            }
            .section-desc {
                font-size: 14px;
            }
            .partner-logos {
                gap: 16px;
            }
            .partner-logos span {
                font-size: 14px;
            }
        }
        @media (max-width: 520px) {
            :root {
                --font-h1: 27px;
                --font-h2: 22px;
                --spacing-section: 40px;
            }
            .hero-content {
                padding: 0 14px;
            }
            .hero-title {
                font-size: 26px;
                line-height: 1.2;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .hero-badge {
                font-size: 10px;
                padding: 5px 14px;
            }
            .data-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .data-number {
                font-size: 28px;
            }
            .data-card {
                padding: 18px 12px;
            }
            .process-list {
                grid-template-columns: 1fr;
            }
            .scenario-card {
                flex: 0 0 220px;
            }
            .scenario-card img {
                height: 140px;
            }
            .pricing-card {
                padding: 20px 18px;
            }
            .pricing-price {
                font-size: 30px;
            }
            .section {
                padding-left: 14px;
                padding-right: 14px;
            }
            .header-inner {
                padding: 0 14px;
            }
        }