/* * DESIGN THEME: Sky Blue Trust & Professional Kindness
         * Adjusted to match the "Sky Blue" request while keeping the clean, kind atmosphere.
         */
        :root {
            --bg-color: #FDFDFF;      /* 아주 차가운 화이트 (Cool White) */
            --bg-secondary: #E3F2FD;  /* 아주 연한 하늘색 배경 */
            --text-primary: #2C3E50;  /* 짙은 네이비/그레이 (신뢰감, 가독성) */
            --text-secondary: #546E7A;/* 차분한 블루 그레이 */
            --accent-color: #42A5F5;  /* 맑은 하늘색 (Sky Blue - 포인트 컬러) */
            --accent-hover: #1E88E5;  /* 호버 시 조금 더 진한 블루 */
            --white: #FFFFFF;
            --border-radius: 16px;
            --shadow: 0 10px 30px rgba(44, 62, 80, 0.08); /* 그림자도 쿨톤으로 변경 */
            --container-width: 1000px;
        }

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

        body {
            font-family: 'Pretendard', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-primary);
            line-height: 1.7;
            word-break: keep-all;
        }

        h1, h2, h3, h4 {
            font-family: 'Noto Serif KR', serif; /* 신뢰감 있는 명조 계열 */
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.3;
        }

        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }

        /* --- LAYOUT UTILITIES --- */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 100px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-header h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--text-primary);
        }

        .section-header h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background-color: var(--accent-color);
            margin: 20px auto 0;
        }

        .section-header p {
            color: var(--text-secondary);
            font-size: 1.1rem;
        }

        /* --- HERO SECTION --- */
        .hero {
            background-color: #1565C0; /* 깊은 바다색/하늘색 배경 */
            background: linear-gradient(135deg, #42A5F5 0%, #1565C0 100%);
            color: var(--white);
            padding: 160px 0 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: radial-gradient(circle at center, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3.5rem;
            color: #FFFFFF;
            margin-bottom: 30px;
            font-weight: 700;
            text-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }

        .hero p {
            font-size: 1.3rem;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 50px;
            font-family: 'Pretendard', sans-serif;
        }

        .btn-primary {
            display: inline-block;
            background-color: var(--white);
            color: var(--accent-hover); /* 버튼 텍스트를 블루로 */
            padding: 15px 40px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 700;
            transition: all 0.3s;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }

        .btn-primary:hover {
            background-color: #F0F8FF;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.15);
        }

        /* --- INTRO SECTION --- */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .intro-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--accent-color);
        }

        .intro-card {
            background: var(--white);
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            border-left: 5px solid var(--accent-color);
        }

        .intro-card ul li {
            margin-bottom: 15px;
            position: relative;
            padding-left: 25px;
            color: var(--text-secondary);
        }

        .intro-card ul li::before {
            content: '•';
            position: absolute;
            left: 0;
            color: var(--accent-color);
            font-size: 1.5em;
            line-height: 1;
        }

        /* --- INNOVATION SECTION --- */
        .bg-secondary {
            background-color: var(--bg-secondary);
        }

        .innovation-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .feature-card {
            background: var(--white);
            padding: 40px;
            border-radius: var(--border-radius);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            border: 1px solid rgba(66, 165, 245, 0.1);
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(30, 136, 229, 0.15);
            border-color: var(--accent-color);
        }

        .icon-box {
            width: 60px;
            height: 60px;
            background-color: #E3F2FD; /* 연한 하늘색 */
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            color: var(--accent-color);
            font-size: 24px;
        }

        .feature-card h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            font-family: 'Pretendard', sans-serif;
        }

        .feature-card p {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 10px;
        }
        
        .feature-detail-list li {
            font-size: 0.95rem;
            color: #607D8B; /* Blue Grey 500 */
            margin-bottom: 5px;
            padding-left: 15px;
            position: relative;
        }
        
        .feature-detail-list li::before {
            content: '-';
            position: absolute;
            left: 0;
            color: var(--accent-color);
        }

        /* --- MULTI CHANNEL --- */
        .channel-wrapper {
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 30px;
            text-align: center;
        }

        .channel-item {
            flex: 1;
            min-width: 250px;
            padding: 30px;
            border: 1px solid #BBDEFB;
            border-radius: var(--border-radius);
            background-color: var(--white);
            transition: 0.3s;
        }
        
        .channel-item:hover {
            border-color: var(--accent-color);
            box-shadow: 0 5px 15px rgba(66, 165, 245, 0.1);
        }

        .channel-item i {
            font-size: 3rem;
            color: var(--accent-color);
            margin-bottom: 20px;
        }

        /* --- EFFECTS & SAAS --- */
        .effects-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-bottom: 80px;
        }

        .effect-box {
            text-align: center;
            padding: 30px 20px;
            background: #1565C0; /* Deep Blue */
            background: linear-gradient(180deg, #1E88E5 0%, #1565C0 100%);
            color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: 0 4px 10px rgba(21, 101, 192, 0.2);
        }
        
        .effect-box h4 {
            color: #BBDEFB; /* Very Light Blue */
            margin-bottom: 15px;
            font-size: 1.2rem;
        }
        
        .effect-box p {
            color: rgba(255,255,255,0.9);
        }

        .saas-info {
            background-color: var(--white);
            padding: 50px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            border: 1px solid #E3F2FD;
        }

        /* --- TIMELINE --- */
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: 100%;
            background-color: #BBDEFB;
        }

        .timeline-item {
            margin-bottom: 40px;
            position: relative;
            width: 50%;
            padding: 0 40px;
        }

        .timeline-item:nth-child(odd) { left: 0; text-align: right; }
        .timeline-item:nth-child(even) { left: 50%; text-align: left; }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            background-color: var(--accent-color);
            border: 4px solid var(--white);
            border-radius: 50%;
            top: 5px;
            box-shadow: 0 0 0 2px #BBDEFB;
        }

        .timeline-item:nth-child(odd)::after { right: -10px; }
        .timeline-item:nth-child(even)::after { left: -10px; }

        .timeline-content h4 {
            font-size: 1.2rem;
            color: var(--accent-color);
            margin-bottom: 5px;
        }

        /* --- FAQ (Interactive) --- */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--white);
            margin-bottom: 15px;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
            border: 1px solid #E3F2FD;
        }

        .faq-question {
            padding: 20px 25px;
            cursor: pointer;
            font-weight: 700;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-primary);
            transition: background-color 0.2s;
        }
        
        .faq-question:hover {
            background-color: #F1F8E9; /* Very light touch */
            background-color: #E3F2FD;
        }
        
        .faq-question i {
            color: var(--accent-color);
            transition: transform 0.3s;
        }

        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 25px 25px;
            color: var(--text-secondary);
            border-top: 1px solid #E3F2FD;
            padding-top: 20px;
            display: none; /* JS로 토글 */
            background-color: #FDFDFF;
        }
        
        .faq-label {
            display: inline-block;
            background: var(--accent-color);
            color: white;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-right: 10px;
            vertical-align: middle;
        }

        /* --- CONTACT & FOOTER --- */
        .contact-section {
            background-color: #1565C0;
            background: linear-gradient(135deg, #1565C0 0%, #0D47A1 100%);
            color: var(--white);
            text-align: center;
            padding: 80px 0;
        }
        
        .contact-info {
            font-size: 1.5rem;
            margin-bottom: 30px;
        }

        footer {
            background-color: #263238; /* Dark Blue Grey */
            color: rgba(255,255,255,0.5);
            text-align: center;
            padding: 30px 0;
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .intro-grid, .innovation-grid, .effects-grid {
                grid-template-columns: 1fr;
            }
            
            .timeline::before { left: 20px; }
            .timeline-item { width: 100%; padding-left: 50px; padding-right: 0; text-align: left; }
            .timeline-item:nth-child(even) { left: 0; }
            .timeline-item:nth-child(odd) { left: 0; text-align: left; }
            .timeline-item:nth-child(odd)::after { left: 12px; right: auto; }
            .timeline-item:nth-child(even)::after { left: 12px; }
            
            .hero h1 { font-size: 2.5rem; }
        }