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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
            height: 100vh;
            position: relative;
        }

        /* 애니메이션 배경 컨테이너 */
        .ocean-background {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(180deg, #0a1628 0%, #1e3a5f 50%, #2d5a87 100%);
            overflow: hidden;
            z-index: -1;
        }

        /* 파도 애니메이션 */
        .wave {
            position: absolute;
            width: 200%;
            height: 100%;
            bottom: -50%;
            left: -50%;
            background: radial-gradient(ellipse at center, rgba(255,255,255,0.05) 0%, transparent 70%);
        }

        .wave::before,
        .wave::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background:
                radial-gradient(600px 300px at 20% 50%, rgba(29, 78, 137, 0.3), transparent),
                radial-gradient(800px 400px at 80% 50%, rgba(45, 90, 155, 0.2), transparent);
            animation: waves 20s infinite ease-in-out;
        }

        .wave::after {
            animation-delay: -10s;
            background:
                radial-gradient(700px 350px at 30% 50%, rgba(64, 124, 191, 0.2), transparent),
                radial-gradient(900px 450px at 70% 50%, rgba(29, 78, 137, 0.3), transparent);
        }

        @keyframes waves {
            0%, 100% {
                transform: translateX(0) translateY(0) scale(1);
            }
            25% {
                transform: translateX(-5%) translateY(-3%) scale(1.05);
            }
            50% {
                transform: translateX(5%) translateY(-5%) scale(1.1);
            }
            75% {
                transform: translateX(-3%) translateY(-2%) scale(1.05);
            }
        }

        /* 파티클 효과 (물방울) */
        .particles {
            position: absolute;
            width: 100%;
            height: 100%;
            overflow: hidden;
        }

        .particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: rgba(255, 255, 255, 0.4);
            border-radius: 50%;
            animation: float-up 15s infinite linear;
        }

        @keyframes float-up {
            0% {
                transform: translateY(100vh) translateX(0);
                opacity: 0;
            }
            10% {
                opacity: 0.4;
            }
            90% {
                opacity: 0.4;
            }
            100% {
                transform: translateY(-100vh) translateX(100px);
                opacity: 0;
            }
        }

        /* 헤더 스타일 */
        .header {
            background: rgba(52, 52, 52, 0.95);
            backdrop-filter: blur(10px);
            padding: 20px 50px;
            position: relative;
            z-index: 100;
            display: flex;
            align-items: center;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
            color: white;
            font-size: 24px;
            font-weight: 600;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .logo-icon svg {
            width: 100%;
            height: 100%;
            fill: #4facfe;
            filter: drop-shadow(0 0 10px rgba(79, 172, 254, 0.5));
            transition: transform 0.3s ease;
        }

        .logo:hover .logo-icon svg {
            transform: scale(1.1);
            filter: drop-shadow(0 0 15px rgba(79, 172, 254, 0.7));
        }

        /* 사용자 메뉴 스타일 */
        .header {
            justify-content: space-between;
        }

        .user-menu {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 10px;
            color: white;
        }

        .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
        }

        .user-name {
            font-size: 14px;
            max-width: 150px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .logout-button {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: white;
            padding: 8px 15px;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.2s;
            font-size: 14px;
        }

        .logout-button:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .login-button {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 8px 20px;
            border-radius: 4px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.2s;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        }

        .login-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
        }

        /* 메인 컨텐츠 영역 */
        .main-container {
            display: flex;
            flex-direction: column;
            height: calc(100vh - 80px);
            position: relative;
            z-index: 10;
        }

        .left-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
            position: relative;
            width: 100%;
            height: 100%;
        }

        .main-content {
            text-align: center;
            color: white;
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            height: 100%;
        }

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

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

        .main-title {
            font-size: 72px;
            font-weight: 700;
            margin-bottom: 20px;
            text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            background: linear-gradient(135deg, #ffffff 0%, #94d3ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            min-height: 86px; /* 타이핑 중 높이 유지 */
        }

        /* 타이핑 커서 효과 */
        .typing-cursor {
            display: inline-block;
            width: 3px;
            height: 72px;
            background: linear-gradient(135deg, #ffffff 0%, #94d3ff 100%);
            margin-left: 5px;
            animation: blink 1s infinite;
            vertical-align: text-bottom;
        }

        @keyframes blink {
            0%, 50% { opacity: 1; }
            51%, 100% { opacity: 0; }
        }

        .sub-text {
            font-size: 24px;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 40px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
            opacity: 0;
            transition: opacity 1s ease-out;
        }

        @keyframes fadeIn {
            to {
                opacity: 1;
            }
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 18px 40px;
            border: none;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 1s ease;
            box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
            position: relative;
            overflow: hidden;
            opacity: 0;
            transform: translateY(20px);
            margin-top: 40px;
            margin-bottom: 30px;
        }

        .cta-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
            transition: left 0.5s;
        }

        .cta-button:hover::before {
            left: 100%;
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(102, 126, 234, 0.5);
        }

        .number-badge {
            background: rgba(255, 255, 255, 0.2);
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

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

            .main-title {
                font-size: 56px;
            }

            .sub-text {
                font-size: 20px;
            }
        }

        @media (max-width: 768px) {
            .header {
                padding: 15px 20px;
            }

            .main-title {
                font-size: 42px;
            }

            .sub-text {
                font-size: 18px;
            }

            .left-section {
                padding: 30px;
            }
        }

        /* 타이핑 섹션과 기능 섹션 스타일 */
        .typing-section {
            width: 100%;
            transition: opacity 1s ease, transform 1s ease;
            cursor: pointer; /* 클릭 가능함을 표시 */
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            z-index: 2;
        }

        .typing-section.hide {
            opacity: 0;
            transform: translateY(-30px);
            transition: opacity 1s ease, transform 1s ease;
        }

        .feature-section {
            width: 100%;
            opacity: 0;
            position: relative;
            z-index: 2;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            transform: translateY(30px);
            transition: opacity 1s ease, transform 1s ease;
            display: none;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .feature-section.show {
            opacity: 1;
            transform: translateY(0);
            position: relative;
            display: flex;
            transition: opacity 1s ease, transform 1s ease;
            height: 100%;
        }

        .section-title {
            font-size: 42px;
            font-weight: 700;
            margin-bottom: 15px;
            background: linear-gradient(135deg, #ffffff 0%, #94d3ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-top: 20px;
        }

        .section-description {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 40px;
            max-width: 800px;
        }

        /* 기능 카드 스타일 */
        .feature-cards {
            position: relative;
            width: 100%;
            max-width: 1200px;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 1s ease, transform 1s ease;
            overflow: hidden;
            margin: 0 auto;
            display: none;
            flex: 1;
            height: calc(100% - 150px);
        }

        .feature-cards.show {
            opacity: 1;
            transform: translateY(0);
            display: block;
            transition: opacity 1s ease, transform 1s ease;
            display: flex;
            flex-direction: column;
        }

        .feature-cards-container {
            display: flex;
            transition: transform 0.5s cubic-bezier(0.33, 1, 0.68, 1);
            width: 500%;
            height: 100%;
            flex: 1;
            position: relative;
        }

        .feature-card {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 30px;
            width: 100%;
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
            color: white;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            flex: 0 0 20%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            height: 100%;
            min-height: 400px;
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
        }

        .feature-icon {
            width: 100px;
            height: 100px;
            margin: 0 auto 30px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
        }

        .feature-icon svg {
            width: 60px;
            height: 60px;
            fill: white;
        }

        .feature-title {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 20px;
            color: #fff;
        }

        .feature-description {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
            max-width: 600px;
            margin: 0 auto;
        }

        /* 페이지 인디케이터 */
        .page-indicators {
            display: flex;
            justify-content: center;
            margin-top: 30px;
            gap: 10px;
            opacity: 0;
            transition: opacity 0.5s ease;
        }

        .page-indicators.show {
            opacity: 1;
        }

        .indicator {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            cursor: pointer;
            transition: background 0.3s ease, transform 0.3s ease;
        }

        .indicator.active {
            background: #4facfe;
            transform: scale(1.3);
        }

        /* 네비게이션 화살표 */
        .nav-arrow {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(5px);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 10;
            opacity: 0;
            transition: opacity 0.3s ease, background 0.3s ease;
        }

        .feature-cards:hover .nav-arrow {
            opacity: 1;
        }

        .nav-arrow:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .nav-arrow.prev {
            left: 20px;
        }

        .nav-arrow.next {
            right: 20px;
        }

        .nav-arrow svg {
            width: 24px;
            height: 24px;
            fill: white;
        }

        @media (max-width: 768px) {
            .header {
                padding: 15px 20px;
            }

            .main-title {
                font-size: 42px;
            }

            .sub-text {
                font-size: 18px;
            }

            .left-section {
                padding: 30px;
            }

            .nav-arrow {
                width: 40px;
                height: 40px;
            }

            .nav-arrow.prev {
                left: 5px;
            }

            .nav-arrow.next {
                right: 5px;
            }
        }

        .typing-cursor.blink-fast {
            animation: blink 0.3s infinite;
        }
    </style>