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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #0a0a0a;
            color: #e0e0e0;
            line-height: 1.6;
        }

        /* 네비게이션 */
        nav {
            background-color: rgba(20, 20, 20, 0.95);
            padding: 1rem 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
        }

        nav .container {
            width: 100%;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 4rem;
        }

        nav .logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: #00d4ff;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }

        nav a {
            color: #e0e0e0;
            text-decoration: none;
            transition: color 0.3s;
        }

        nav a:hover {
            color: #00d4ff;
        }

        /* 히어로 섹션 */
        .hero {
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: linear-gradient(135deg, #1a1a1a 0%, #0a0a0a 100%);
            position: relative;
            overflow: hidden;
            background-image: url('/images/bb1.jpg');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 10, 10, 0.7);
            z-index: 0;
        }

        .hero::after {
            content: '';
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            top: -250px;
            right: -250px;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            padding: 2rem;
        }

        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 1rem;
            color: #fff;
            animation: fadeInUp 1s ease;
        }

        .hero p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            color: #b0b0b0;
            animation: fadeInUp 1s ease 0.2s backwards;
        }

        .btn {
            display: inline-block;
            padding: 1rem 2.5rem;
            background: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
            color: #fff;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            transition: transform 0.3s, box-shadow 0.3s;
            animation: fadeInUp 1s ease 0.4s backwards;
        }

        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
        }

        /* 섹션 공통 스타일 */
        section {
            padding: 5rem 4rem;
            width: 100%;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        h2 {
            font-size: 2.5rem;
            margin-bottom: 3rem;
            text-align: center;
            color: #00d4ff;
        }

        /* 기능 섹션 */
        .features {
            background-color: #0f0f0f;
            position: relative;
            overflow: hidden;
        }

        .features::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('https://images.unsplash.com/photo-1461896836934-ffe607ba8211?w=1920&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            opacity: 0.15;
            z-index: 0;
        }

        .features > * {
            position: relative;
            z-index: 1;
        }

        .features-content {
            width: 100%;
        }

        .view-toggle {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-bottom: 3rem;
        }

        .toggle-btn {
            padding: 0.8rem 2rem;
            background-color: #1a1a1a;
            color: #e0e0e0;
            border: 2px solid #2a2a2a;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 1rem;
            font-weight: 600;
        }

        .toggle-btn:hover {
            border-color: #00d4ff;
            color: #00d4ff;
        }

        .toggle-btn.active {
            background: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
            color: #fff;
            border-color: #00d4ff;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            max-width: 1600px;
            margin: 0 auto;
        }

        @media (min-width: 768px) {
            .feature-grid {
                grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            }
        }

        @media (min-width: 1600px) {
            .feature-grid {
                grid-template-columns: repeat(5, 1fr);
            }
        }

        .feature-card {
            background-color: #1a1a1a;
            padding: 2rem;
            border-radius: 10px;
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid #2a2a2a;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0, 212, 255, 0.2);
        }

        .feature-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
        }

        .feature-card h3 {
            color: #00d4ff;
            margin-bottom: 1rem;
        }

        /* 이미지 버전 스타일 */
        .feature-card-image {
            background-color: #1a1a1a;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid #2a2a2a;
        }

        .feature-card-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0, 212, 255, 0.2);
        }

        .feature-thumbnail {
            width: 100%;
            aspect-ratio: 4 / 3;
            overflow: hidden;
            background-color: #0a0a0a;
        }

        .feature-thumbnail img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .feature-card-image:hover .feature-thumbnail img {
            transform: scale(1.1);
        }

        .feature-content {
            padding: 1.5rem;
        }

        .feature-content h3 {
            color: #00d4ff;
            margin-bottom: 0.8rem;
            font-size: 1.3rem;
        }

        .feature-content p {
            color: #b0b0b0;
            line-height: 1.6;
        }

        /* 가격 섹션 */
        .pricing {
            background-color: #0a0a0a;
            position: relative;
            overflow: hidden;
        }

        .pricing::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('https://images.unsplash.com/photo-1579952363873-27f3bade9f55?w=1920&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            opacity: 0.12;
            z-index: 0;
        }

        .pricing > * {
            position: relative;
            z-index: 1;
        }

        .pricing-intro {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 4rem;
        }

        .pricing-intro p {
            font-size: 1.2rem;
            color: #b0b0b0;
            line-height: 1.8;
        }

        .base-pricing {
            max-width: 900px;
            margin: 0 auto 5rem;
            background: linear-gradient(135deg, #1a1a1a 0%, #252525 100%);
            padding: 3rem;
            border-radius: 20px;
            border: 2px solid #00d4ff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        @media (min-width: 768px) {
            .base-pricing {
                max-width: 1400px;
            }
        }

        @media (min-width: 1200px) {
            .base-pricing {
                max-width: 1600px;
            }
        }

        .base-pricing::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
            animation: rotate 20s linear infinite;
        }

        @keyframes rotate {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .base-pricing-content {
            position: relative;
            z-index: 1;
        }

        .base-pricing h3 {
            color: #00d4ff;
            font-size: 2.2rem;
            margin-bottom: 1rem;
        }

        .base-price {
            font-size: 3.5rem;
            color: #fff;
            font-weight: bold;
            margin: 1.5rem 0;
        }

        .base-price span {
            font-size: 1.3rem;
            color: #b0b0b0;
            font-weight: normal;
        }

        .base-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        @media (min-width: 768px) {
            .base-features {
                grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            }
        }

        @media (min-width: 1400px) {
            .base-features {
                grid-template-columns: repeat(5, 1fr);
            }
        }

        .base-feature-item {
            background-color: rgba(42, 42, 42, 0.3);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid rgba(0, 212, 255, 0.2);
            transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
        }

        .base-feature-item:hover {
            transform: translateY(-5px);
            border-color: rgba(0, 212, 255, 0.5);
            box-shadow: 0 8px 25px rgba(0, 212, 255, 0.15);
        }

        .base-feature-thumbnail {
            width: 100%;
            height: 140px;
            overflow: hidden;
            background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
            position: relative;
        }

        .base-feature-thumbnail img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .base-feature-item:hover .base-feature-thumbnail img {
            transform: scale(1.1);
        }

        .base-feature-thumbnail::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 40%;
            background: linear-gradient(to top, rgba(26, 26, 26, 0.8), transparent);
        }

        .base-feature-content {
            padding: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .base-feature-content::before {
            content: '✓';
            color: #00d4ff;
            font-size: 1.5rem;
            font-weight: bold;
            flex-shrink: 0;
        }

        .base-feature-content span {
            color: #e0e0e0;
            font-size: 1.05rem;
        }

        .additional-section {
            margin-top: 5rem;
        }

        .additional-section h3 {
            text-align: center;
            color: #00d4ff;
            font-size: 2rem;
            margin-bottom: 3rem;
        }

        .additional-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            max-width: 1600px;
            margin: 0 auto;
        }

        @media (min-width: 768px) {
            .additional-grid {
                grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            }
        }

        @media (min-width: 1600px) {
            .additional-grid {
                grid-template-columns: repeat(5, 1fr);
            }
        }

        .additional-card {
            background-color: #1a1a1a;
            border-radius: 15px;
            overflow: hidden;
            border: 1px solid #2a2a2a;
            transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
            cursor: pointer;
        }

        .additional-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 40px rgba(0, 212, 255, 0.25);
            border-color: #00d4ff;
        }

        .additional-thumbnail {
            width: 100%;
            height: 220px;
            overflow: hidden;
            background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
            position: relative;
        }

        .additional-thumbnail img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .additional-card:hover .additional-thumbnail img {
            transform: scale(1.15);
        }

        .additional-thumbnail::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 50%;
            background: linear-gradient(to top, rgba(26, 26, 26, 0.9), transparent);
        }

        .additional-content {
            padding: 2rem;
        }

        .additional-header {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-bottom: 1rem;
        }

        .additional-card h4 {
            color: #00d4ff;
            font-size: 1.5rem;
            margin-bottom: 0;
        }

        .additional-price {
            font-size: 1.8rem;
            color: #fff;
            font-weight: bold;
            text-align: left;
        }

        .additional-price span {
            font-size: 1rem;
            color: #b0b0b0;
            font-weight: normal;
        }

        .additional-description {
            color: #b0b0b0;
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }

        .additional-features {
            list-style: none;
            padding: 0;
        }

        .additional-features li {
            padding: 0.6rem 0;
            color: #e0e0e0;
            border-bottom: 1px solid #2a2a2a;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .additional-features li:last-child {
            border-bottom: none;
        }

        .additional-features li::before {
            content: '▸';
            color: #00d4ff;
            font-weight: bold;
        }

        /* 연락 섹션 */
        .contact {
            background-color: #0f0f0f;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .contact::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('https://images.unsplash.com/photo-1517649763962-0c623066013b?w=1920&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            opacity: 0.15;
            z-index: 0;
        }

        .contact > * {
            position: relative;
            z-index: 1;
        }

        .telegram-banner {
            max-width: 600px;
            margin: 0 auto;
            padding: 3rem;
            background: linear-gradient(135deg, #1a1a1a 0%, #252525 100%);
            border-radius: 20px;
            border: 2px solid #2a2a2a;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .telegram-banner:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0, 212, 255, 0.2);
        }

        .telegram-icon {
            margin-bottom: 1.5rem;
            animation: float 3s ease-in-out infinite;
        }

        .telegram-banner h3 {
            color: #00d4ff;
            font-size: 2rem;
            margin-bottom: 1rem;
        }

        .telegram-banner p {
            color: #b0b0b0;
            margin-bottom: 2rem;
            font-size: 1.1rem;
        }

        .telegram-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 1rem;
        }

        .telegram-btn:hover {
            background: linear-gradient(135deg, #00b8d4 0%, #0088aa 100%);
        }

        .telegram-id {
            color: #00d4ff;
            font-size: 1.2rem;
            font-weight: bold;
            margin-top: 1.5rem;
            padding: 0.8rem;
            background-color: #1a1a1a;
            border-radius: 10px;
            display: inline-block;
        }

        @keyframes float {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-10px);
            }
        }

        /* 푸터 */
        footer {
            background-color: #0a0a0a;
            text-align: center;
            padding: 2rem;
            border-top: 1px solid #2a2a2a;
            min-height: auto;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 스크롤 애니메이션 */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s, transform 0.6s;
        }

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

        /* 반응형 디자인 */
        @media (max-width: 1200px) {
            .feature-grid {
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            }
            
            .additional-grid {
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            }
        }

        @media (max-width: 768px) {
            /* 폰트 사이즈 축소 */
            body {
                font-size: 14px;
            }

            nav .container {
                padding: 0 1.5rem;
            }

            nav .logo {
                font-size: 1.2rem;
            }

            nav ul {
                gap: 1rem;
                font-size: 0.9rem;
            }

            section {
                padding: 3rem 1.5rem;
            }

            h2 {
                font-size: 1.8rem;
                margin-bottom: 2rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .hero p {
                font-size: 1rem;
            }

            .btn {
                padding: 0.8rem 2rem;
                font-size: 0.9rem;
            }

            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }
            
            .additional-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }
            
            .base-features {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem;
            }

            .feature-card {
                padding: 1.5rem;
            }

            .feature-icon {
                font-size: 2rem;
            }

            .feature-card h3,
            .feature-content h3 {
                font-size: 1.1rem;
            }

            .feature-card p,
            .feature-content p {
                font-size: 0.9rem;
            }

            .base-price {
                font-size: 2.5rem;
            }

            .base-price span {
                font-size: 1rem;
            }

            .base-pricing h3 {
                font-size: 1.6rem;
            }

            .base-pricing p {
                font-size: 0.95rem;
            }

            .base-feature-content span {
                font-size: 0.9rem;
            }

            .additional-section h3 {
                font-size: 1.5rem;
            }

            .additional-card h4 {
                font-size: 1.2rem;
            }

            .additional-price {
                font-size: 1.4rem;
            }

            .additional-description {
                font-size: 0.9rem;
            }

            .additional-features li {
                font-size: 0.85rem;
            }

            .telegram-banner h3 {
                font-size: 1.5rem;
            }

            .telegram-banner p {
                font-size: 0.95rem;
            }

            .telegram-id {
                font-size: 1rem;
            }

            .pricing-intro p {
                font-size: 1rem;
            }

            .toggle-btn {
                font-size: 0.85rem;
                padding: 0.7rem 1.5rem;
                border-radius:10px;
            }
        }

        @media (max-width: 480px) {
            /* 더 작은 화면에서도 2컬럼 유지 */
            body {
                font-size: 12px;
            }

            nav .container {
                padding: 0 1rem;
            }

            section {
                padding: 2.5rem 1rem;
            }

            h2 {
                font-size: 1.5rem;
            }

            .hero h1 {
                font-size: 1.6rem;
            }

            .hero p {
                font-size: 0.9rem;
            }

            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            
            .additional-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            
            .base-features {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }

            /* 기본 패키지 패딩 축소 */
            .base-pricing {
                padding: 2rem 1.5rem;
            }

            .base-price {
                font-size: 2rem;
                margin: 1rem 0;
            }

            .base-pricing h3 {
                font-size: 1.4rem;
                margin-bottom: 0.5rem;
            }

            .base-pricing p {
                font-size: 0.85rem;
                margin-bottom: 1.5rem;
            }

            .base-features {
                margin-top: 1.5rem;
            }

            .base-feature-item {
                border-radius: 8px;
            }

            .base-feature-thumbnail {
                height: 100px;
            }

            .base-feature-content {
                padding: 0.8rem;
            }

            .base-feature-content span {
                font-size: 0.8rem;
            }

            .base-pricing .btn {
                margin-top: 1.5rem;
            }

            /* 주요 기능 제목 사이즈 축소 */
            .feature-card h3 {
                font-size: 0.95rem;
            }

            .feature-content h3 {
                font-size: 1rem;
            }

            .feature-icon {
                font-size: 1.8rem;
            }

            /* 추가 기능 제목과 가격 사이즈 축소 */
            .additional-card h4 {
                font-size: 0.95rem;
            }

            .additional-price {
                font-size: 1.1rem;
            }

            .additional-price span {
                font-size: 0.75rem;
            }

            .additional-description {
                font-size: 0.8rem;
            }

            .additional-features li {
                font-size: 0.75rem;
            }

            .additional-content {
                padding: 1.2rem;
            }
        }