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

        :root {
            /* SalesBoost BI Colors */
            --blue-1: #0552CC;
            --blue-2: #3D86FA;
            --blue-3: #A0C4FD;
            --blue-4: #D2E3FE;
            --blue-5: #043E9A;
            --black: #000000;
            --green: #BCF354;
            --white: #ffffff;
            --gray: #6c757d;
            --light: #f8f9fa;

            /* Gradients */
            --primary-gradient: linear-gradient(135deg, #0552CC 0%, #3D86FA 100%);
            --accent-gradient: linear-gradient(135deg, #043E9A 0%, #0552CC 100%);

            /* Shadows */
            --shadow: 0 10px 40px rgba(5, 82, 204, 0.15);
            --shadow-lg: 0 20px 60px rgba(5, 82, 204, 0.2);
        }

        body {
            font-family: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.6;
            color: var(--black);
            background: var(--white);
            overflow-x: hidden;
            font-weight: 400;
            /* Pretendard Regular */
        }

        /* Navigation */
        nav {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(20px);
            z-index: 1000;
            padding: 1rem 0;
            box-shadow: 0 1px 0 rgba(5, 82, 204, 0.1);
        }

        nav .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
        }

        .logo-img {
            height: 32px;
            width: auto;
        }

        .nav-links {
            display: flex;
            gap: 2.5rem;
            list-style: none;
            align-items: center;
            margin-left: auto;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--black);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: var(--blue-1);
        }

        .nav-cta {
            background: var(--primary-gradient);
            color: white !important;
            padding: 0.75rem 1.5rem;
            border-radius: 8px;
            font-weight: 600;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(5, 82, 204, 0.35);
            color: white !important;
        }

        /* Hero Section */
        .hero {
            margin-top: 72px;
            background: linear-gradient(135deg, #000000 0%, #0a1628 50%, #0552CC 100%);
            color: white;
            padding: 7rem 2rem 8rem;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(5, 82, 204, 0.4) 0%, transparent 70%);
            border-radius: 50%;
            animation: pulse 8s infinite ease-in-out;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -5%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(61, 134, 250, 0.2) 0%, transparent 70%);
            border-radius: 50%;
            animation: pulse 10s infinite ease-in-out reverse;
        }

        @keyframes pulse {

            0%,
            100% {
                transform: scale(1);
                opacity: 0.8;
            }

            50% {
                transform: scale(1.1);
                opacity: 1;
            }
        }

        .hero .container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .hero-content {
            max-width: 720px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(188, 243, 84, 0.15);
            color: var(--green);
            padding: 0.5rem 1rem;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
            border: 1px solid rgba(188, 243, 84, 0.3);
        }

        .hero-badge::before {
            content: '🎫';
        }

        .hero h1 {
            font-family: 'Pretendard Variable', 'Pretendard', sans-serif;
            font-size: 3.5rem;
            font-weight: 900;
            /* Pretendard Black */
            line-height: 1.25;
            margin-bottom: 1.5rem;
            letter-spacing: -0.02em;
        }

        .hero h1 .gradient-text {
            background: linear-gradient(135deg, var(--blue-2) 0%, var(--green) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 1.25rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 2.5rem;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            margin-top: 4rem;
        }

        .stat-item {
            text-align: center;
            padding: 1.5rem;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 16px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: transform 0.3s, background 0.3s;
        }

        .stat-item:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.08);
        }

        .stat-number {
            font-family: 'Inter', sans-serif;
            font-size: 2.25rem;
            font-weight: 900;
            /* Inter Black */
            color: var(--blue-2);
            display: block;
            margin-bottom: 0.25rem;
        }

        .stat-label {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }

        .cta-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .btn {
            padding: 1rem 2rem;
            border-radius: 10px;
            font-weight: 600;
            font-size: 1rem;
            text-decoration: none;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary-gradient);
            color: white;
            box-shadow: 0 8px 30px rgba(5, 82, 204, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(5, 82, 204, 0.5);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.1);
            color: white;
            border: 1.5px solid rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(10px);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: rgba(255, 255, 255, 0.4);
        }

        /* Partners Section */
        .partners {
            padding: 4rem 2rem;
            background: var(--blue-4);
            text-align: center;
        }

        .partners .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .partners h3 {
            font-size: 0.9rem;
            color: var(--blue-5);
            text-transform: uppercase;
            letter-spacing: 3px;
            margin-bottom: 2.5rem;
            font-weight: 600;
        }

        .partner-logos {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 4rem;
            flex-wrap: wrap;
        }

        .partner-logo-img {
            height: 52px;
            width: auto;
        }

        .partner-logo {
            font-family: 'Inter', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--blue-5);
            opacity: 0.6;
            transition: opacity 0.3s;
        }

        .partner-logo:hover {
            opacity: 1;
        }

        .partner-logo.coming-soon {
            font-style: italic;
            opacity: 0.4;
            font-weight: 500;
        }

        /* Problem-Solution Section */
        .problem-solution {
            padding: 7rem 2rem;
            background: white;
        }

        .problem-solution .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-badge {
            display: inline-block;
            background: var(--blue-4);
            color: var(--blue-1);
            padding: 0.5rem 1.25rem;
            border-radius: 100px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .section-header h2 {
            font-family: 'Pretendard Variable', 'Pretendard', sans-serif;
            font-size: 2.5rem;
            font-weight: 900;
            /* Pretendard Black */
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
            color: var(--black);
        }

        .section-header p {
            font-size: 1.125rem;
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto;
        }

        .problem-solution-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: start;
        }

        .problem-box,
        .solution-box {
            padding: 2.5rem;
            border-radius: 20px;
        }

        .problem-box {
            background: #f8f9fa;
            border: 1px solid #e9ecef;
        }

        .solution-box {
            background: var(--primary-gradient);
            color: white;
            box-shadow: var(--shadow-lg);
        }

        .problem-box h3,
        .solution-box h3 {
            font-size: 1.35rem;
            margin-bottom: 1.75rem;
            font-weight: 700;
        }

        .problem-list,
        .solution-list {
            list-style: none;
        }

        .problem-list li,
        .solution-list li {
            padding: 0.875rem 0;
            padding-left: 2rem;
            position: relative;
            font-size: 1rem;
            line-height: 1.6;
        }

        .problem-list li::before {
            content: '✗';
            position: absolute;
            left: 0;
            color: #dc3545;
            font-weight: 700;
        }

        .solution-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--green);
            font-weight: 700;
        }

        /* Features Section */
        .features {
            padding: 7rem 2rem;
            background: var(--black);
            color: white;
        }

        .features .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 4rem;
        }

        .feature-card {
            background: rgba(5, 82, 204, 0.1);
            padding: 2.5rem;
            border-radius: 20px;
            border: 1px solid rgba(5, 82, 204, 0.2);
            transition: transform 0.3s, border-color 0.3s, background 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-8px);
            border-color: var(--blue-2);
            background: rgba(5, 82, 204, 0.15);
        }

        .feature-icon {
            width: 64px;
            height: 64px;
            background: var(--primary-gradient);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.75rem;
            margin-bottom: 1.5rem;
        }

        .feature-card h3 {
            font-size: 1.35rem;
            margin-bottom: 0.875rem;
            font-weight: 700;
        }

        .feature-card p {
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.75;
            font-size: 1rem;
        }

        /* How It Works */
        .how-it-works {
            padding: 7rem 2rem;
            background: white;
        }

        .how-it-works .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2.5rem;
            margin-top: 4rem;
            position: relative;
        }

        .steps::before {
            content: '';
            position: absolute;
            top: 48px;
            left: 18%;
            right: 18%;
            height: 3px;
            background: linear-gradient(90deg, var(--blue-1) 0%, var(--blue-2) 100%);
            z-index: 0;
            border-radius: 2px;
        }

        .step {
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .step-number {
            width: 96px;
            height: 96px;
            background: var(--primary-gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Inter', sans-serif;
            font-size: 2.25rem;
            font-weight: 900;
            /* Inter Black */
            color: white;
            margin: 0 auto 1.75rem;
            box-shadow: 0 12px 35px rgba(5, 82, 204, 0.35);
        }

        .step h3 {
            font-size: 1.35rem;
            margin-bottom: 0.875rem;
            font-weight: 700;
            color: var(--black);
        }

        .step p {
            color: var(--gray);
            line-height: 1.75;
            font-size: 1rem;
            max-width: 280px;
            margin: 0 auto;
        }

        /* Performance Section */
        .performance {
            padding: 7rem 2rem;
            background: var(--primary-gradient);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .performance::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
        }

        .performance .container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .performance-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2.5rem;
            margin-top: 4rem;
        }

        .performance-stat {
            text-align: center;
            padding: 2.5rem;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 20px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: transform 0.3s, background 0.3s;
        }

        .performance-stat:hover {
            transform: translateY(-8px);
            background: rgba(255, 255, 255, 0.15);
        }

        .performance-number {
            font-family: 'Inter', sans-serif;
            font-size: 3.5rem;
            font-weight: 900;
            /* Inter Black */
            margin-bottom: 0.5rem;
            color: white;
        }

        .performance-label {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
        }

        /* Testimonials */
        .testimonials {
            padding: 7rem 2rem;
            background: var(--light);
        }

        .testimonials .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .testimonial-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2.5rem;
            margin-top: 4rem;
        }

        .testimonial-card {
            background: white;
            padding: 2.5rem;
            border-radius: 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            border: 1px solid rgba(5, 82, 204, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .testimonial-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 40px rgba(5, 82, 204, 0.12);
        }

        .quote-icon {
            font-size: 4rem;
            color: var(--blue-3);
            line-height: 1;
            margin-bottom: 1rem;
            font-family: Georgia, serif;
        }

        .testimonial-text {
            font-size: 1.05rem;
            line-height: 1.8;
            color: #333;
            margin-bottom: 2rem;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .author-avatar {
            width: 52px;
            height: 52px;
            background: var(--primary-gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 700;
            font-size: 1.25rem;
        }

        .author-info h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 0.15rem;
            color: var(--black);
        }

        .author-info p {
            font-size: 0.875rem;
            color: var(--gray);
        }

        /* CTA Section */
        .cta-section {
            padding: 6rem 2rem;
            background: var(--black);
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: 50%;
            transform: translateX(-50%);
            width: 800px;
            height: 800px;
            background: radial-gradient(circle, rgba(5, 82, 204, 0.3) 0%, transparent 70%);
            border-radius: 50%;
        }

        .cta-section .container {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 2.75rem;
            font-weight: 800;
            margin-bottom: 1.25rem;
            line-height: 1.3;
        }

        .cta-section h2 .highlight {
            color: var(--green);
        }

        .cta-section p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 2.5rem;
        }

        .cta-buttons-center {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .cta-buttons-center .btn-primary {
            background: var(--green);
            color: var(--black);
            font-weight: 700;
        }

        .cta-buttons-center .btn-primary:hover {
            box-shadow: 0 12px 40px rgba(188, 243, 84, 0.4);
        }

        /* Footer */
        footer {
            background: #0a0a0a;
            color: rgba(255, 255, 255, 0.75);
            padding: 5rem 2rem 2rem;
        }

        footer .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 4rem;
            margin-bottom: 4rem;
        }

        .footer-logo {
            height: 28px;
            width: auto;
            margin-bottom: 1rem;
            filter: brightness(0) invert(1);
        }

        .footer-brand p {
            line-height: 1.8;
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }

        .footer-brand a {
            color: var(--blue-2);
            text-decoration: none;
        }

        .footer-links h4 {
            color: white;
            font-size: 1rem;
            margin-bottom: 1.25rem;
            font-weight: 600;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.75rem;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            transition: color 0.3s;
            font-size: 0.95rem;
        }

        .footer-links a:hover {
            color: var(--blue-2);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 2rem;
            text-align: center;
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.5);
        }

        /* Animations */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .fade-in-delay-1 {
            transition-delay: 0.15s;
        }

        .fade-in-delay-2 {
            transition-delay: 0.3s;
        }

        .fade-in-delay-3 {
            transition-delay: 0.45s;
        }

        /* Advertisers Section - 광고주 정보 */
        .advertisers {
            padding: 7rem 2rem;
            background: var(--light);
        }

        .advertisers .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .advertiser-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            margin-top: 4rem;
        }

        .advertiser-stat {
            text-align: center;
            padding: 2.5rem 1.5rem;
            background: white;
            border-radius: 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            border: 1px solid rgba(5, 82, 204, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .advertiser-stat:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 40px rgba(5, 82, 204, 0.12);
        }

        .advertiser-stat-number {
            font-family: 'Inter', sans-serif;
            font-size: 3rem;
            font-weight: 900;
            color: var(--blue-1);
            margin-bottom: 0.5rem;
        }

        .advertiser-stat-label {
            font-size: 1rem;
            color: var(--gray);
            font-weight: 500;
        }

        /* Advertiser Logos/Posters Gallery - Carousel */
        .advertiser-gallery {
            margin-top: 4rem;
            padding-top: 3rem;
            border-top: 1px solid rgba(5, 82, 204, 0.1);
        }

        .advertiser-gallery-title {
            text-align: center;
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--gray);
            margin-bottom: 2rem;
        }

        .carousel-container {
            position: relative;
            overflow: hidden;
            margin: 0 -2rem;
            padding: 1rem 0;
        }

        .carousel-track {
            display: flex;
            gap: 1.5rem;
            animation: carousel-scroll 30s linear infinite;
            width: max-content;
        }

        .carousel-track:hover {
            animation-play-state: paused;
        }

        @keyframes carousel-scroll {
            0% {
                transform: translateX(0);
            }

            100% {
                transform: translateX(-50%);
            }
        }

        .advertiser-poster-item {
            flex-shrink: 0;
            width: 180px;
            height: 240px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s, box-shadow 0.3s;
            background: linear-gradient(135deg, var(--blue-4) 0%, var(--blue-3) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .advertiser-poster-item:hover {
            transform: scale(1.05);
            box-shadow: 0 12px 35px rgba(5, 82, 204, 0.2);
        }

        .advertiser-poster-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .advertiser-poster-placeholder {
            font-size: 2.5rem;
            color: var(--blue-1);
        }

        /* Ad Placements Section - 광고 노출 위치 */
        .ad-placements {
            padding: 7rem 2rem;
            background: white;
        }

        .ad-placements .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .placements-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 4rem;
        }

        .placement-card {
            background: var(--light);
            border-radius: 20px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid rgba(5, 82, 204, 0.08);
        }

        .placement-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 60px rgba(5, 82, 204, 0.15);
        }

        .placement-image {
            width: 100%;
            height: 200px;
            background: linear-gradient(135deg, var(--blue-4) 0%, var(--blue-3) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4rem;
        }

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

        .placement-content {
            padding: 1.5rem;
        }

        .placement-badge {
            display: inline-block;
            background: var(--blue-4);
            color: var(--blue-1);
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
        }

        .placement-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--black);
        }

        .placement-content p {
            font-size: 0.95rem;
            color: var(--gray);
            line-height: 1.6;
        }

        /* Success Cases Section - 성공 사례 */
        .success-cases {
            padding: 7rem 2rem;
            background: var(--black);
            color: white;
        }

        .success-cases .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .success-cases .section-badge {
            background: rgba(188, 243, 84, 0.2);
            color: var(--green);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 4rem;
        }

        .case-card {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: transform 0.3s, background 0.3s;
        }

        .case-card:hover {
            transform: translateY(-8px);
            background: rgba(255, 255, 255, 0.08);
        }

        .case-image {
            width: 100%;
            height: 180px;
            background: linear-gradient(135deg, var(--blue-5) 0%, var(--blue-1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

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

        .case-image-placeholder {
            font-size: 3rem;
        }

        .case-content {
            padding: 1.5rem;
        }

        .case-category {
            display: inline-block;
            background: rgba(188, 243, 84, 0.2);
            color: var(--green);
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
        }

        .case-content h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
            color: white;
            line-height: 1.4;
        }

        .case-metrics {
            display: flex;
            gap: 1.5rem;
            margin-top: 1rem;
            padding-top: 1rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .case-metric {
            text-align: left;
        }

        .case-metric-value {
            font-family: 'Inter', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--green);
        }

        .case-metric-label {
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 0.25rem;
        }

        .cases-cta {
            text-align: center;
            margin-top: 3rem;
        }

        .btn-cases {
            display: inline-block;
            padding: 1rem 2.5rem;
            background: transparent;
            color: white;
            border: 2px solid var(--green);
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
        }

        .btn-cases:hover {
            background: var(--green);
            color: var(--black);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(188, 243, 84, 0.3);
        }

        /* Responsive */
        @media (max-width: 1024px) {

            .features-grid,
            .steps,
            .performance-stats,
            .advertiser-stats,
            .placements-grid,
            .cases-grid {
                grid-template-columns: 1fr 1fr;
            }

            .steps::before {
                display: none;
            }

            .advertiser-poster-item {
                width: 150px;
                height: 200px;
            }
        }

        @media (max-width: 768px) {
            .nav-links li:not(.lang-switcher-item) {
                display: none;
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .hero-stats,
            .problem-solution-grid,
            .features-grid,
            .steps,
            .performance-stats,
            .testimonial-grid,
            .footer-content,
            .advertiser-stats,
            .placements-grid,
            .cases-grid {
                grid-template-columns: 1fr;
            }

            .section-header h2 {
                font-size: 2rem;
            }

            .cta-section h2 {
                font-size: 2rem;
            }

            .advertiser-stat-number {
                font-size: 2.5rem;
            }

            .advertiser-poster-item {
                width: 120px;
                height: 160px;
            }

            .carousel-track {
                gap: 1rem;
            }

            .case-metrics {
                flex-direction: column;
                gap: 1rem;
            }
        }

        /* ============================================
           Language Switcher
           ============================================ */
        .lang-switcher {
            position: relative;
        }

        .lang-switcher-btn {
            display: flex;
            align-items: center;
            gap: 0.35rem;
            background: none;
            border: 1px solid rgba(0, 0, 0, 0.15);
            border-radius: 6px;
            padding: 0.4rem 0.7rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--black);
            cursor: pointer;
            transition: border-color 0.3s, background 0.3s;
            font-family: inherit;
        }

        .lang-switcher-btn:hover {
            border-color: var(--blue-1);
            background: rgba(5, 82, 204, 0.04);
        }

        .lang-switcher-btn .globe-icon {
            font-size: 1rem;
        }

        .lang-switcher-btn .arrow-icon {
            font-size: 0.6rem;
            transition: transform 0.2s;
        }

        .lang-switcher.open .lang-switcher-btn .arrow-icon {
            transform: rotate(180deg);
        }

        .lang-dropdown {
            display: none;
            position: absolute;
            top: calc(100% + 4px);
            right: 0;
            background: white;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
            min-width: 130px;
            z-index: 1001;
            overflow: hidden;
        }

        .lang-switcher.open .lang-dropdown {
            display: block;
        }

        .lang-dropdown a {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.6rem 1rem;
            text-decoration: none;
            color: var(--black);
            font-size: 0.85rem;
            font-weight: 500;
            transition: background 0.2s;
        }

        .lang-dropdown a:hover {
            background: rgba(5, 82, 204, 0.06);
        }

        .lang-dropdown a.active {
            color: var(--blue-1);
            font-weight: 700;
            background: rgba(5, 82, 204, 0.04);
        }

        /* Mobile language switcher - always visible */
        @media (max-width: 768px) {
            .lang-switcher-item {
                display: block !important;
                position: fixed;
                top: 1.1rem;
                right: 1rem;
                z-index: 1001;
                list-style: none;
            }
        }

        /* Chinese font override */
        html[lang="zh-TW"] body {
            font-family: 'Noto Sans TC', 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
        }

        /* ============================================
           Mobile Navigation (Hamburger Menu)
           ============================================ */
        .mobile-menu-btn {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
            z-index: 1002;
        }

        .mobile-menu-btn span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--black);
            transition: all 0.3s ease;
        }

        .mobile-menu-btn.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .mobile-menu-btn.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-menu-btn.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: flex;
            }

            nav .container {
                justify-content: space-between;
            }

            .nav-links {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1rem 0;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
                display: none;
                gap: 0;
                z-index: 999;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-links li {
                display: block !important;
                width: 100%;
            }

            .nav-links li:not(.lang-switcher-item) {
                display: block !important;
            }

            .nav-links li a {
                display: block;
                padding: 1rem 2rem;
                border-bottom: 1px solid rgba(5, 82, 204, 0.08);
            }

            .nav-links li a:hover {
                background: rgba(5, 82, 204, 0.04);
            }

            .nav-links .nav-cta {
                margin: 1rem 2rem;
                text-align: center;
                border-radius: 8px;
                display: block;
            }

            /* Language switcher in mobile menu */
            .lang-switcher-item {
                position: static !important;
                top: auto !important;
                right: auto !important;
                padding: 1rem 2rem;
            }

            .lang-switcher-item .lang-switcher {
                width: 100%;
            }

            .lang-switcher-item .lang-switcher-btn {
                width: 100%;
                justify-content: center;
            }

            .lang-switcher-item .lang-dropdown {
                position: static;
                box-shadow: none;
                border: 1px solid rgba(0, 0, 0, 0.1);
                margin-top: 0.5rem;
            }
        }