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

        body {
            font-family: 'Hiragino Sans', 'Yu Gothic', 'Meiryo', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            overflow-x: hidden;
        }

        .container {
            text-align: center;
            max-width: 800px;
            width: 90%;
            padding: 2rem;
        }

        .hero-section {
            margin-bottom: 4rem;
            animation: fadeInUp 1s ease-out;
        }

        .hero-title {
            font-size: clamp(2.5rem, 6vw, 4rem);
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            background: linear-gradient(45deg, #ffffff, #f0f8ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: clamp(1.1rem, 2.5vw, 1.5rem);
            margin-bottom: 1rem;
            opacity: 0.9;
            line-height: 1.6;
        }

        .hero-description {
            font-size: clamp(0.9rem, 2vw, 1.1rem);
            opacity: 0.8;
            margin-bottom: 3rem;
            line-height: 1.7;
        }

        .main-button {
            display: inline-block;
            padding: 1.5rem 3rem;
            font-size: 1.3rem;
            font-weight: 600;
            text-decoration: none;
            color: #667eea;
            background: linear-gradient(145deg, #ffffff, #f8f9ff);
            border-radius: 50px;
            box-shadow: 
                0 10px 30px rgba(0,0,0,0.2),
                inset 0 1px 0 rgba(255,255,255,0.8);
            transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
            position: relative;
            overflow: hidden;
            margin-bottom: 4rem;
        }

        .main-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;
        }

        .main-button:hover {
            transform: translateY(-3px);
            box-shadow: 
                0 15px 40px rgba(0,0,0,0.25),
                inset 0 1px 0 rgba(255,255,255,0.9);
            color: #5a67d8;
        }

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

        .main-button:active {
            transform: translateY(-1px);
        }

        .text-links {
            display: flex;
            gap: 2rem;
            justify-content: center;
            flex-wrap: wrap;
            opacity: 0.7;
        }

        .text-link {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            font-size: 0.9rem;
            padding: 0.5rem 1rem;
            border-bottom: 1px solid transparent;
            transition: all 0.3s ease;
        }

        .text-link:hover {
            color: white;
            border-bottom-color: rgba(255,255,255,0.5);
            opacity: 1;
        }

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

        .floating-particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
        }

        .particle {
            position: absolute;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            animation: float 20s infinite linear;
        }

        .particle:nth-child(1) { width: 10px; height: 10px; left: 10%; animation-delay: 0s; }
        .particle:nth-child(2) { width: 8px; height: 8px; left: 20%; animation-delay: -5s; }
        .particle:nth-child(3) { width: 12px; height: 12px; left: 30%; animation-delay: -10s; }
        .particle:nth-child(4) { width: 6px; height: 6px; left: 40%; animation-delay: -15s; }
        .particle:nth-child(5) { width: 14px; height: 14px; left: 50%; animation-delay: -20s; }
        .particle:nth-child(6) { width: 8px; height: 8px; left: 60%; animation-delay: -25s; }
        .particle:nth-child(7) { width: 10px; height: 10px; left: 70%; animation-delay: -30s; }
        .particle:nth-child(8) { width: 12px; height: 12px; left: 80%; animation-delay: -35s; }
        .particle:nth-child(9) { width: 6px; height: 6px; left: 90%; animation-delay: -40s; }

        @keyframes float {
            0% {
                transform: translateY(100vh) rotate(0deg);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 1;
            }
            100% {
                transform: translateY(-10vh) rotate(360deg);
                opacity: 0;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 1.5rem;
            }
            
            .main-button {
                padding: 1.2rem 2.5rem;
                font-size: 1.1rem;
            }
            
            .text-links {
                flex-direction: column;
                gap: 1rem;
            }
        }