:root {
            --primary-color: #0f2a4a; /* Deep Navy for corporate authority */
            --secondary-color: #c5a059; /* Gold for premium strategic value */
            --text-dark: #333333;
            --text-light: #ffffff;
            --bg-light: #f8f9fa;
            --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --card-hover-shadow: 0 15px 35px rgba(15, 42, 74, 0.18);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
        }

        body {
            color: var(--text-dark);
            line-height: 1.6;
            background-color: #ffffff;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* Header & Navigation */
        header {
            background-color: var(--primary-color);
            padding: 20px 10%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        .logo {
            color: var(--text-light);
            font-size: 24px;
            font-weight: bold;
            letter-spacing: 1px;
        }

        .logo span {
            color: var(--secondary-color);
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        /* Language Selector Styling */
        .lang-selector {
            background-color: transparent;
            color: var(--text-light);
            border: 1px solid var(--secondary-color);
            padding: 8px 12px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            outline: none;
        }

        .lang-selector option {
            background-color: var(--primary-color);
            color: var(--text-light);
        }

        /* Master Corporate Hero Section */
        .hero {
            background: linear-gradient(rgba(15, 42, 74, 0.9), rgba(15, 42, 74, 0.9)), url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?auto=format&fit=crop&w=1950&q=80') no-repeat center center/cover;
            padding: 100px 20px;
            text-align: center;
            color: var(--text-light);
        }

        .hero h1 {
            font-size: 42px;
            margin-bottom: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .hero p {
            font-size: 20px;
            max-width: 850px;
            margin: 0 auto;
            color: #e0e0e0;
        }

        /* Main Context Section Layout */
        section {
            padding: 80px 10%;
            flex: 1;
        }

        .section-title {
            text-align: center;
            font-size: 32px;
            color: var(--primary-color);
            margin-bottom: 15px;
            position: relative;
        }

        .section-subtitle {
            text-align: center;
            font-size: 16px;
            color: #666666;
            margin-bottom: 60px;
        }

        /* Functional Zooming Activity Matrix */
        .activity-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 35px;
        }

        /* Link Wrapper Properties */
        .activity-link {
            text-decoration: none;
            color: inherit;
            display: block;
        }

        /* The Custom Shaped Activity Block */
        .activity-block {
            background-color: #ffffff;
            border-radius: 8px;
            padding: 10px 10px;
            border: 1px solid rgba(0, 0, 0, 0.05);
            box-shadow: var(--card-shadow);
            border-top: 4px solid var(--primary-color);
            transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), 
                        box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), 
                        border-color 0.4s;
            height: 100%;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        /* Hover Zooming and Lift Mechanics */
        .activity-link:hover .activity-block {
            transform: translateY(-8px) scale(1.03);
            box-shadow: var(--card-hover-shadow);
            border-color: var(--secondary-color);
        }

        /* Content Elements inside Block */
        .block-icon {
            font-size: 36px;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }

        .activity-block h3 {
            font-size: 22px;
            color: var(--primary-color);
            margin-bottom: 15px;
            font-weight: 700;
        }

        .activity-block p {
            font-size: 15px;
            color: #555555;
            margin-bottom: 16px;
            flex-grow: 1;
        }

        /* Clean "Learn More" interactive trigger */
        .block-cta {
            font-size: 14px;
            font-weight: bold;
            color: var(--secondary-color);
            display: flex;
            align-items: center;
            gap: 5px;
            margin-top: auto;
        }

        .block-cta::after {
            content: '→';
            transition: transform 0.3s;
        }

        .activity-link:hover .block-cta::after {
            transform: translateX(5px);
        }

        /* Footer */
        footer {
            background-color: #0a1d33;
            color: #7f8c8d;
            text-align: center;
            padding: 25px;
            font-size: 14px;
            border-top: 1px solid rgba(255,255,255,0.05);
        }

        /* Responsive Breakpoints */
        @media (max-width: 768px) {
            /*header { flex-direction: column; gap: 15px; padding: 15px 5%; }*/
            header { padding: 15px 5%; }
            .logo { font-size: 18px;}
            .hero h1 { font-size: 28px; }
            .hero p { font-size: 16px; }
            section { padding: 50px 5%; }
            .activity-grid { grid-template-columns: 1fr; }
        }