:root {
        --primary-green: #0096FF; /* Main */
        --forest-green: #3FA664; /* Sub */
        --warm-neutral: #FFFFFF; /* Background */
        --soft-blue: #7FB77E; /* Light */
        --sage-green: #3FA664; /* Sub補助 */
        --warm-white: #FFFFFF; /* ホワイト背景 */
        --text-dark: #333333; /* 濃い文字 */
        --text-medium: #7FB77E; /* Light文字 */
        --text-light: #3FA664; /* Sub補助文字 */
        --accent-coral: #FF4C4C; /* Accent */
        --gradient-primary: none; /* グラデーションなし */
        --gradient-secondary: none;
        --shadow-soft: 0 8px 32px rgba(0, 150, 255, 0.1); /* 青のシャドウ */
        --shadow-hover: 0 12px 40px rgba(0, 150, 255, 0.15);
    }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Nunito', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background: var(--warm-neutral);
            overflow-x: hidden;
        }

        /* Skip Link for Accessibility */
        .skip-link {
            position: absolute;
            top: -40px;
            left: 6px;
            background: var(--text-dark);
            color: white;
            padding: 8px;
            text-decoration: none;
            border-radius: 4px;
            z-index: 1000;
        }

        .skip-link:focus {
            top: 6px;
        }

        /* Header */
        header {
            background: var(--warm-white);
            box-shadow: var(--shadow-soft);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: all 0.3s ease;
        }

        nav {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: var(--text-dark);
        }

        .logo-icon {
            width: 48px;
            height: 48px;
            background-color: #0096FF;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 12px;
            font-weight: 800;
            font-size: 1.5rem;
            color: white;
            text-shadow: 0 2px 4px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }

        .logo:hover .logo-icon {
            transform: scale(1.05) rotate(-2deg);
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            background-color: #0096FF;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-menu {
            background-color: #3FA664;
            padding: 12px 24px;
            border-radius: 50px;
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-soft);
        }

        .main-menu:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            text-decoration: none;
            color: var(--text-dark);
        }

        /* Hero Section */
        .hero {
            background-color: #0096FF;
            padding: 80px 2rem;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            width: 200%;
            height: 200%;
            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='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
            animation: float 20s linear infinite;
            pointer-events: none;
        }

        @keyframes float {
            0% { transform: translate(-50%, -50%) rotate(0deg); }
            100% { transform: translate(-50%, -50%) rotate(360deg); }
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }

        .hero p {
            font-size: 1.2rem;
            opacity: 0.95;
            margin-bottom: 2rem;
            line-height: 1.7;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            background: var(--warm-white);
            color: var(--text-dark);
            padding: 16px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.1rem;
            box-shadow: var(--shadow-soft);
            transition: all 0.3s ease;
            margin: 8px;
        }

        /* Hero Keywords */
        .hero-keywords {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin: 2rem 0;
        }

        .keyword-tag {
            background: rgba(255,255,255,0.2);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.3);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            color: white;
            transition: all 0.3s ease;
        }

        .keyword-tag:hover {
            background: rgba(255,255,255,0.3);
            transform: translateY(-2px);
        }

        /* Categories Grid */
        .categories {
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 2rem;
        }

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 3rem;
            color: var(--text-dark);
        }

        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-bottom: 4rem;
        }

        .category-card {
            background: var(--warm-white);
            border-radius: 20px;
            padding: 2rem;
            box-shadow: var(--shadow-soft);
            transition: all 0.3s ease;
            cursor: pointer;
            border: 2px solid transparent;
            position: relative;
            overflow: hidden;
        }

        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 4px;
            background-color: #0096FF;
            transition: left 0.3s ease;
        }

        .category-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-green);
        }

        .category-card:hover::before {
            left: 0;
        }

        .category-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            display: block;
        }

        .category-title {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
        }

        .category-description {
            color: var(--text-medium);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Special Categories */
        .special-categories {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .special-card {
            background-color: #3FA664;
            border-radius: 24px;
            padding: 2.5rem;
            color: var(--text-dark);
            position: relative;
            overflow: hidden;
        }

        .special-card::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 100px;
            height: 100px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            animation: pulse 4s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 0.7; }
            50% { transform: scale(1.2); opacity: 0.3; }
        }

        /* Footer */
        footer {
            background: var(--text-dark);
            color: white;
            padding: 3rem 2rem 2rem;
            text-align: center;
        }

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

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: var(--primary-green);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

        /* Responsive Design */
        @media (max-width: 768px) {
            nav {
                padding: 1rem;
                flex-direction: column;
                gap: 1rem;
            }

            .hero {
                padding: 60px 1rem;
            }

            .categories {
                padding: 60px 1rem;
            }

            .categories-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .special-categories {
                grid-template-columns: 1fr;
            }

            .footer-links {
                flex-direction: column;
                gap: 1rem;
            }
        }

        /* Focus Styles for Accessibility */
        .category-card:focus,
        .cta-button:focus,
        .main-menu:focus {
            outline: 3px solid var(--accent-coral);
            outline-offset: 2px;
        }

        /* Loading Animation */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 0.8s ease forwards;
        }

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

        /* Interactive Elements */
        .emoji-float {
            display: inline-block;
            animation: gentle-bounce 2s ease-in-out infinite;
        }

        @keyframes gentle-bounce {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-5px); }
        }