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

        body {
            font-family: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
            line-height: 1.7;
            color: #333;
            background: #f8f9fa;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header */
        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: bold;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }

        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s;
        }

        .nav-links a:hover {
            opacity: 0.8;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 3rem 0;
            text-align: center;
        }

        .hero h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            font-weight: 700;
        }

        .hero p {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 600px;
            margin: 0 auto;
        }

        /* Timeline Section */
        .timeline-section {
            padding: 4rem 0;
            background: white;
        }

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 3rem;
            color: #333;
        }

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

        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            transform: translateX(-50%);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 3rem;
            width: 50%;
            opacity: 0;
            animation: fadeInUp 0.8s forwards;
        }

        .timeline-item:nth-child(odd) {
            left: 0;
            padding-right: 2rem;
            text-align: right;
        }

        .timeline-item:nth-child(even) {
            left: 50%;
            padding-left: 2rem;
            text-align: left;
        }

        .timeline-item:nth-child(1) { animation-delay: 0.1s; }
        .timeline-item:nth-child(2) { animation-delay: 0.2s; }
        .timeline-item:nth-child(3) { animation-delay: 0.3s; }
        .timeline-item:nth-child(4) { animation-delay: 0.4s; }
        .timeline-item:nth-child(5) { animation-delay: 0.5s; }
        .timeline-item:nth-child(6) { animation-delay: 0.6s; }
        .timeline-item:nth-child(7) { animation-delay: 0.7s; }
        .timeline-item:nth-child(8) { animation-delay: 0.8s; }

        .timeline-content {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            position: relative;
            border-left: 4px solid #667eea;
        }

        .timeline-item:nth-child(even) .timeline-content {
            border-left: none;
            border-right: 4px solid #667eea;
        }

        .timeline-number {
            position: absolute;
            top: 50%;
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
            transform: translateY(-50%);
            z-index: 10;
        }

        .timeline-item:nth-child(odd) .timeline-number {
            right: -27px;
        }

        .timeline-item:nth-child(even) .timeline-number {
            left: -27px;
        }

        .timeline-title {
            color: #667eea;
            font-size: 1.3rem;
            font-weight: bold;
            margin-bottom: 1rem;
        }

        .timeline-period {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 500;
            display: inline-block;
            margin-bottom: 1rem;
        }

        .timeline-description {
            color: #666;
            line-height: 1.6;
            margin-bottom: 1rem;
        }

        .timeline-details {
            background: white;
            padding: 1rem;
            border-radius: 8px;
            border-left: 3px solid #667eea;
            margin-top: 1rem;
        }

        .timeline-details h4 {
            color: #667eea;
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }

        .timeline-details ul {
            margin-left: 1rem;
            color: #666;
        }

        .timeline-details li {
            margin-bottom: 0.3rem;
        }

        /* Documents Section */
        .documents-section {
            padding: 4rem 0;
            background: #f8f9fa;
        }

        .documents-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .document-card {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            border-top: 4px solid #667eea;
        }

        .document-card .icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .document-card h3 {
            color: #333;
            margin-bottom: 1rem;
        }

        .document-card .requirements {
            background: #f8f9fa;
            padding: 1rem;
            border-radius: 8px;
            margin-top: 1rem;
        }

        .document-card .requirements h4 {
            color: #667eea;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }

        .document-card .requirements ul {
            margin-left: 1rem;
            font-size: 0.9rem;
            color: #666;
        }

        /* Tips Section */
        .tips-section {
            padding: 4rem 0;
            background: white;
        }

        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .tip-card {
            background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
            padding: 2rem;
            border-radius: 15px;
            border-left: 4px solid #667eea;
            position: relative;
        }

        .tip-card::before {
            content: "💡";
            position: absolute;
            top: 1rem;
            right: 1rem;
            font-size: 1.5rem;
        }

        .tip-card h3 {
            color: #667eea;
            margin-bottom: 1rem;
        }

        .tip-card p {
            color: #666;
            line-height: 1.6;
        }

        /* Progress Indicator */
        .progress-indicator {
            position: fixed;
            right: 2rem;
            top: 50%;
            transform: translateY(-50%);
            z-index: 100;
            background: white;
            padding: 1rem;
            border-radius: 10px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            display: none;
        }

        .progress-step {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: #eee;
            color: #999;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 0.5rem;
            font-size: 0.8rem;
            font-weight: bold;
            transition: all 0.3s;
            cursor: pointer;
        }

        .progress-step.active {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        /* Footer */
        footer {
            background: #333;
            color: white;
            padding: 3rem 0 1rem;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-section h3 {
            margin-bottom: 1rem;
            color: #667eea;
        }

        .footer-section a {
            color: #ccc;
            text-decoration: none;
            display: block;
            margin-bottom: 0.5rem;
            transition: color 0.3s;
        }

        .footer-section a:hover {
            color: white;
        }

        .footer-bottom {
            border-top: 1px solid #555;
            padding-top: 1rem;
            text-align: center;
            color: #999;
        }

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

        /* Responsive */
        @media (max-width: 768px) {
            .timeline::before {
                left: 2rem;
            }
            
            .timeline-item {
                width: 100%;
                left: 0 !important;
                padding-left: 4rem !important;
                padding-right: 0 !important;
                text-align: left !important;
            }
            
            .timeline-item .timeline-number {
                left: 0.75rem !important;
                right: auto !important;
            }
            
            .timeline-content {
                border-left: 4px solid #667eea !important;
                border-right: none !important;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .nav-links {
                display: none;
            }
            
            .progress-indicator {
                display: none !important;
            }
            
            .documents-grid,
            .tips-grid {
                grid-template-columns: 1fr;
            }
        }

        .highlight-box {
            background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
            border: 1px solid #667eea;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
            text-align: center;
        }

        .highlight-box .title {
            color: #667eea;
            font-weight: bold;
            margin-bottom: 0.5rem;
        }

        .cta-section {
            padding: 3rem 0;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            text-align: center;
            color: white;
        }

        .cta-button {
            background: white;
            color: #667eea;
            padding: 1rem 2rem;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.3s;
            margin: 1rem;
            text-decoration: none;
            display: inline-block;
        }

        .cta-button:hover {
            transform: translateY(-2px);
        }