.hero {
                background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f4 100%);
                padding: 80px 5% 60px;
                text-align: center;
            }

            .breadcrumb {
                max-width: 1200px;
                margin: 0 auto 30px;
                font-size: 14px;
                color: #666;
                text-align: left;
            }

            .breadcrumb a {
                color: #4caf50;
                text-decoration: none;
            }

            .hero h1 {
                font-size: 36px;
                color: #2e7d32;
                margin-bottom: 20px;
                max-width: 1200px;
                margin-left: auto;
                margin-right: auto;
            }

            .hero-meta {
                max-width: 1200px;
                margin: 0 auto;
                display: flex;
                gap: 30px;
                justify-content: center;
                flex-wrap: wrap;
                font-size: 14px;
                color: #666;
            }

            .hero-meta span {
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .container {
                max-width: 1200px;
                margin: 0 auto;
                padding: 60px 5%;
            }

            .section {
                margin-bottom: 80px;
            }

            .section-title {
                font-size: 28px;
                color: #2e7d32;
                margin-bottom: 30px;
                padding-bottom: 15px;
                border-bottom: 3px solid #4caf50;
            }

            .overview-grid {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
                gap: 30px;
                margin-bottom: 40px;
            }

            .overview-card {
                background: white;
                padding: 30px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            }

            .overview-card h3 {
                font-size: 18px;
                color: #2e7d32;
                margin-bottom: 15px;
                display: flex;
                align-items: center;
                gap: 10px;
            }

            .overview-card p {
                color: #555;
                line-height: 1.8;
            }

            .icon {
                width: 24px;
                height: 24px;
                color: #4caf50;
            }

            /* 事例タイトルセクション */
            .case-title-section {
                margin-bottom: 60px;
            }

            .case-title-card {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                text-align: center;
            }

            .case-badge {
                display: inline-block;
                background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
                color: white;
                padding: 8px 20px;
                border-radius: 20px;
                font-size: 13px;
                font-weight: 600;
                margin-bottom: 20px;
            }

            .case-title-card h2 {
                font-size: 32px;
                color: #2e7d32;
                margin-bottom: 25px;
                font-weight: 700;
            }

            .case-meta-info {
                display: flex;
                gap: 30px;
                justify-content: center;
                flex-wrap: wrap;
            }

            .meta-item {
                display: flex;
                align-items: center;
                gap: 8px;
                color: #666;
                font-size: 14px;
            }

            .meta-item svg {
                color: #4caf50;
            }

            /* 課題と解決策 - タイムラインスタイル */
            .challenge-solution-section {
                margin-bottom: 40px;
            }

            .challenge-image-container {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                margin-bottom: 50px;
            }

            .challenge-image-container h3 {
                font-size: 24px;
                color: #ff9800;
                margin-bottom: 25px;
                display: flex;
                align-items: center;
                gap: 12px;
            }

            .challenge-image-wrapper {
                background: #fafafa;
                padding: 30px;
                border-radius: 10px;
                text-align: center;
            }

            .challenge-image-wrapper img {
                max-width: 100%;
                height: auto;
                border-radius: 8px;
            }

            .solution-detailed {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            }

            .solution-detailed h3 {
                font-size: 24px;
                color: #2e7d32;
                margin-bottom: 40px;
                display: flex;
                align-items: center;
                gap: 12px;
            }

            .solution-timeline {
                position: relative;
                padding-left: 50px;
            }

            .solution-timeline::before {
                content: "";
                position: absolute;
                left: 20px;
                top: 0;
                height: calc(100% - 55px);
                width: 3px;
                background: linear-gradient(180deg, #4caf50 0%, #81c784 100%);
            }

            .timeline-item {
                position: relative;
                margin-bottom: 35px;
                padding-bottom: 35px;
                border-bottom: 1px solid #f0f0f0;
            }

            .timeline-item:last-child {
                border-bottom: none;
                margin-bottom: 0;
                padding-bottom: 0;
            }

            .timeline-dot {
                position: absolute;
                left: -38px;
                top: 5px;
                width: 16px;
                height: 16px;
                background: white;
                border: 3px solid #4caf50;
                border-radius: 50%;
                box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.1);
            }

            .timeline-number {
                position: absolute;
                left: -50px;
                top: 0;
                width: 40px;
                height: 40px;
                background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                color: white;
                font-weight: bold;
                font-size: 16px;
                box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
            }

            .timeline-content h4 {
                color: #2e7d32;
                font-size: 17px;
                margin-bottom: 12px;
                font-weight: 600;
            }

            .timeline-content p {
                color: #555;
                line-height: 1.8;
                font-size: 14px;
            }

            /* 課題と解決策 - 新しいカードレイアウト */
            .challenge-solution-cards {
                margin-bottom: 40px;
            }

            .cards-container {
                display: grid;
                gap: 30px;
            }

            .challenge-card,
            .solution-card {
                background: white;
                border-radius: 16px;
                padding: 40px;
                box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
                position: relative;
                overflow: hidden;
            }

            .challenge-card::before,
            .solution-card::before {
                content: "";
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 6px;
            }

            .challenge-card::before {
                background: linear-gradient(90deg, #ff9800 0%, #ff5722 100%);
            }

            .solution-card::before {
                background: linear-gradient(90deg, #4caf50 0%, #66bb6a 100%);
            }

            .card-header {
                display: flex;
                align-items: center;
                gap: 15px;
                margin-bottom: 25px;
            }

            .card-icon-wrapper {
                width: 60px;
                height: 60px;
                border-radius: 12px;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            /* 課題セクション */
            .challenge-solution-section {
                margin-bottom: 40px;
            }
            .challenge-image-container {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                margin-bottom: 50px;
            }
            .challenge-image-container > h3 {
                font-size: 20px;
                color: #ff9800;
                margin-bottom: 28px;
                display: flex;
                align-items: center;
                gap: 10px;
                font-weight: 700;
            }

            .issue-cards {
                display: grid;
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
            .issue-card {
                background: #f8f9ff;
                border: 1.5px solid #dde3f0;
                border-radius: 12px;
                padding: 24px 20px 20px;
                display: flex;
                flex-direction: column;
                gap: 14px;
            }
            .issue-card-title {
                font-size: 16px;
                font-weight: 700;
                color: #333;
                text-align: center;
                line-height: 1.5;
            }
            .issue-card-desc {
                font-size: 13px;
                color: #555;
                text-align: center;
                line-height: 1.7;
            }
            .issue-card-visual {
                background: white;
                border-radius: 8px;
                padding: 16px;
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 10px;
                min-height: 130px;
                justify-content: center;
            }

            .excel-nodes {
                display: flex;
                gap: 8px;
                justify-content: center;
                align-items: center;
            }
            .excel-tag {
                background: #e8f5e9;
                border: 1.5px solid #81c784;
                border-radius: 6px;
                padding: 5px 9px;
                font-size: 11px;
                font-weight: 700;
                color: #2e7d32;
                text-align: center;
                line-height: 1.4;
            }
            .arrow-down {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 0;
            }
            .arrow-down-line {
                width: 2px;
                height: 16px;
                background: #bbb;
            }
            .arrow-down-head {
                width: 0;
                height: 0;
                border-left: 5px solid transparent;
                border-right: 5px solid transparent;
                border-top: 7px solid #bbb;
            }
            .db-ng {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
            }
            .db-icon svg {
                width: 32px;
                height: 32px;
                color: #90a4ae;
            }
            .ng-badge {
                background: #ffebee;
                border: 1.5px solid #ef9a9a;
                border-radius: 4px;
                padding: 2px 10px;
                font-size: 11px;
                font-weight: 700;
                color: #e53935;
            }

            .location-row {
                display: flex;
                align-items: center;
                gap: 10px;
                justify-content: center;
            }
            .location-box {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
            }
            .location-box svg {
                width: 32px;
                height: 32px;
                color: #90a4ae;
            }
            .location-label {
                font-size: 11px;
                color: #666;
                font-weight: 600;
            }
            .q-area {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
            }
            .q-mark {
                font-size: 28px;
                color: #bdbdbd;
                font-weight: 700;
                line-height: 1;
            }
            .contact-icons {
                display: flex;
                gap: 6px;
                align-items: center;
            }
            .contact-icons svg {
                width: 18px;
                height: 18px;
                color: #90a4ae;
            }
            .time-badge {
                background: #fff3e0;
                border: 1.5px solid #ffcc80;
                border-radius: 20px;
                padding: 3px 12px;
                font-size: 11px;
                color: #e65100;
                font-weight: 700;
            }

            .excel-mock-wrap {
                position: relative;
                width: 100%;
                max-width: 155px;
            }
            .excel-mock {
                width: 100%;
                border-radius: 6px;
                overflow: hidden;
                border: 1.5px solid #ddd;
            }
            .excel-mock-header {
                background: #217346;
                color: white;
                padding: 3px 8px;
                font-size: 10px;
                font-weight: 700;
            }
            .excel-row {
                display: grid;
                grid-template-columns: 1fr 1fr;
                border-bottom: 1px solid #e0e0e0;
            }
            .excel-row:last-child {
                border-bottom: none;
            }
            .excel-cell {
                padding: 3px 6px;
                border-right: 1px solid #e0e0e0;
                color: #333;
                font-size: 10px;
            }
            .excel-cell:last-child {
                border-right: none;
            }
            .excel-cell.hd {
                background: #f5f5f5;
                font-weight: 700;
            }
            .excel-overlay {
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                background: rgba(255, 255, 255, 0.93);
                border: 2px solid #ef5350;
                border-radius: 8px;
                padding: 6px 10px;
                text-align: center;
                white-space: nowrap;
            }
            .excel-overlay-icon {
                font-size: 15px;
            }
            .excel-overlay-text {
                font-size: 10px;
                font-weight: 700;
                color: #c62828;
                line-height: 1.3;
            }
            .risk-badge {
                background: #ffebee;
                border: 1.5px solid #ef9a9a;
                border-radius: 20px;
                padding: 3px 12px;
                font-size: 11px;
                color: #c62828;
                font-weight: 700;
            }

            .solution-card .card-icon-wrapper {
                background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
            }

            .card-icon-wrapper svg {
                width: 32px;
                height: 32px;
            }

            .challenge-card .card-icon-wrapper svg {
                color: #ff9800;
            }

            .solution-card .card-icon-wrapper svg {
                color: #2e7d32;
            }

            .card-header h3 {
                font-size: 24px;
                margin: 0;
            }

            .challenge-card .card-header h3 {
                color: #ff9800;
            }

            .solution-card .card-header h3 {
                color: #2e7d32;
            }

            .card-content {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
                gap: 20px;
            }

            .card-item {
                background: #f9f9f9;
                padding: 20px;
                border-radius: 10px;
                display: flex;
                gap: 12px;
                align-items: flex-start;
                transition: all 0.3s;
            }

            .card-item:hover {
                transform: translateX(5px);
                background: #f5f5f5;
            }

            .item-number {
                width: 28px;
                height: 28px;
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                font-weight: bold;
                font-size: 14px;
                flex-shrink: 0;
            }

            .challenge-card .item-number {
                background: #ff9800;
                color: white;
            }

            .solution-card .item-number {
                background: #4caf50;
                color: white;
            }

            .item-text {
                flex: 1;
                color: #555;
                line-height: 1.6;
                font-size: 14px;
            }

            /* システム構成図 */
            .system-diagram {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                margin-bottom: 40px;
            }

            /* システム画面セクション */
            .system-screens {
                display: flex;
                flex-direction: column;
                gap: 40px;
            }

            .screen-card {
                background: white;
                border-radius: 12px;
                overflow: hidden;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                transition: all 0.3s;
            }

            .screen-card:hover {
                transform: translateY(-5px);
                box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            }

            .screen-image {
                width: 100%;
                background: #f5f5f5;
                padding: 20px;
                display: flex;
                justify-content: center;
                align-items: center;
                min-height: 400px;
            }

            .screen-image img {
                max-width: 100%;
                height: auto;
                border-radius: 8px;
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            }

            .screen-info {
                padding: 30px;
                background: white;
            }

            .screen-info h3 {
                font-size: 20px;
                color: #2e7d32;
                margin-bottom: 12px;
            }

            .screen-info p {
                color: #666;
                line-height: 1.8;
                font-size: 15px;
            }

            .diagram-visual-container {
                background: linear-gradient(135deg, #f5f5f5 0%, #e8f5e9 100%);
                padding: 50px 30px;
                border-radius: 12px;
                margin-top: 25px;
            }

            .diagram-layout {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 50px;
                max-width: 1000px;
                margin: 0 auto;
                align-items: center;
            }

            /* 左側 - 貴社拠点 */
            .company-side {
                background: white;
                padding: 30px;
                border-radius: 12px;
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            }

            .company-header {
                text-align: center;
                margin-bottom: 25px;
                padding-bottom: 15px;
                border-bottom: 2px solid #e0e0e0;
            }

            .company-header h4 {
                color: #2e7d32;
                font-size: 18px;
                margin-bottom: 10px;
            }

            .server-box {
                background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
                color: white;
                padding: 25px;
                border-radius: 10px;
                margin-bottom: 20px;
                text-align: center;
                box-shadow: 0 4px 10px rgba(33, 150, 243, 0.3);
            }

            .server-box h5 {
                font-size: 14px;
                margin-bottom: 8px;
                opacity: 0.9;
            }

            .server-box p {
                font-size: 12px;
                opacity: 0.8;
            }

            .web-system-box {
                background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
                color: white;
                padding: 25px;
                border-radius: 10px;
                text-align: center;
                box-shadow: 0 4px 10px rgba(255, 152, 0, 0.3);
            }

            .web-system-box h5 {
                font-size: 16px;
                margin-bottom: 10px;
            }

            .web-system-box p {
                font-size: 12px;
                opacity: 0.9;
            }

            .badge {
                display: inline-block;
                background: rgba(255, 255, 255, 0.3);
                padding: 4px 12px;
                border-radius: 20px;
                font-size: 11px;
                margin-top: 8px;
            }

            .feature-list {
                margin-top: 15px;
                text-align: left;
            }

            .feature-list li {
                font-size: 11px;
                margin-bottom: 5px;
                padding-left: 15px;
                position: relative;
            }

            .feature-list li::before {
                content: "•";
                position: absolute;
                left: 0;
            }

            /* 右側 - 貴社拠点ABC + クラウド */
            .locations-side {
                display: flex;
                flex-direction: column;
                gap: 25px;
            }

            .location-group {
                background: white;
                padding: 20px;
                border-radius: 10px;
                box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            }

            .location-group h5 {
                color: #2e7d32;
                font-size: 14px;
                margin-bottom: 12px;
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .location-icon {
                width: 30px;
                height: 30px;
                background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
                border-radius: 6px;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            .location-icon svg {
                width: 18px;
                height: 18px;
                color: #2e7d32;
            }

            .user-device {
                display: flex;
                align-items: center;
                gap: 10px;
                padding: 10px;
                background: #f9f9f9;
                border-radius: 6px;
                margin-bottom: 8px;
            }

            .user-device svg {
                width: 20px;
                height: 20px;
                color: #666;
            }

            .user-device span {
                font-size: 13px;
                color: #666;
            }

            .cloud-section {
                background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
                padding: 25px;
                border-radius: 10px;
                border: 2px dashed #2196f3;
            }

            .cloud-section h5 {
                color: #1976d2;
                font-size: 15px;
                margin-bottom: 15px;
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .cloud-icon {
                width: 35px;
                height: 35px;
                color: #1976d2;
            }

            .database-box {
                background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
                color: white;
                padding: 20px;
                border-radius: 8px;
                text-align: center;
                box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
            }

            .database-box svg {
                width: 40px;
                height: 40px;
                margin-bottom: 8px;
            }

            .database-box p {
                font-size: 13px;
                margin: 0;
            }

            /* 接続線 */
            .connection-arrows {
                position: relative;
                text-align: center;
                padding: 20px 0;
            }

            .arrow-text {
                background: white;
                padding: 8px 15px;
                border-radius: 20px;
                display: inline-block;
                font-size: 12px;
                color: #666;
                box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
                margin: 5px 0;
            }

            /* 技術スタック */
            .tech-stack {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
                gap: 20px;
            }

            .tech-category {
                background: white;
                padding: 25px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            }

            .tech-category h4 {
                font-size: 16px;
                color: #2e7d32;
                margin-bottom: 15px;
                font-weight: bold;
            }

            .tech-tags {
                display: flex;
                flex-wrap: wrap;
                gap: 8px;
            }

            .tech-tag {
                background: #e8f5e9;
                color: #2e7d32;
                padding: 6px 14px;
                border-radius: 20px;
                font-size: 13px;
                font-weight: 500;
            }

            /* 成果セクション */
            .results-grid {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
                gap: 25px;
            }

            .result-card {
                background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
                color: white;
                padding: 30px;
                border-radius: 12px;
                text-align: center;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            }

            .result-value {
                font-size: 42px;
                font-weight: bold;
                margin-bottom: 10px;
            }

            .result-label {
                font-size: 14px;
                opacity: 0.95;
            }

            /* 注意事項ボックス */
            .info-box {
                background: #e3f2fd;
                border-left: 4px solid #2196f3;
                padding: 20px 25px;
                margin: 30px 0;
                border-radius: 8px;
            }

            .info-box h4 {
                color: #1976d2;
                font-size: 16px;
                margin-bottom: 10px;
            }

            .info-box p {
                color: #666;
                font-size: 14px;
                line-height: 1.7;
            }

            /* CTAセクション */
            .cta-section {
                background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f4 100%);
                padding: 60px 5%;
                text-align: center;
            }

            .cta-content {
                max-width: 800px;
                margin: 0 auto;
            }

            .cta-section h2 {
                font-size: 32px;
                color: #2e7d32;
                margin-bottom: 20px;
            }

            .cta-section p {
                font-size: 16px;
                color: #555;
                margin-bottom: 30px;
            }

            .cta-buttons {
                display: flex;
                gap: 20px;
                justify-content: center;
                flex-wrap: wrap;
            }

            .btn {
                padding: 15px 40px;
                border-radius: 30px;
                text-decoration: none;
                font-weight: bold;
                font-size: 16px;
                transition: all 0.3s;
                display: inline-block;
            }

            .btn-primary {
                background: #4caf50;
                color: white;
            }

            .btn-primary:hover {
                background: #45a049;
                transform: translateY(-2px);
                box-shadow: 0 6px 20px rgba(76, 175, 80, 0.3);
            }

            .btn-secondary {
                background: white;
                color: #4caf50;
                border: 2px solid #4caf50;
            }

            .btn-secondary:hover {
                background: #4caf50;
                color: white;
            }

            /* フッター */

@media (max-width: 768px) {
                nav {
                    padding: 14px 20px;
                }
                .logo img {
                    max-width: 120px;
                    margin-right: 10px;
                }
                .team-name {
                    font-size: 18px;
                }
                .nav-links {
                    display: none;
                }
                .hamburger {
                    display: flex;
                }
            }

            /* メインコンテンツ */
            .hero {
                background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f4 100%);
                padding: 80px 5% 60px;
                text-align: center;
            }

            .breadcrumb {
                max-width: 1200px;
                margin: 0 auto 30px;
                font-size: 14px;
                color: #666;
                text-align: left;
            }

            .breadcrumb a {
                color: #4caf50;
                text-decoration: none;
            }

            .hero h1 {
                font-size: 36px;
                color: #2e7d32;
                margin-bottom: 20px;
                max-width: 1200px;
                margin-left: auto;
                margin-right: auto;
            }

            .hero-meta {
                max-width: 1200px;
                margin: 0 auto;
                display: flex;
                gap: 30px;
                justify-content: center;
                flex-wrap: wrap;
                font-size: 14px;
                color: #666;
            }

            .hero-meta span {
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .container {
                max-width: 1200px;
                margin: 0 auto;
                padding: 60px 5%;
            }

            .section {
                margin-bottom: 80px;
            }

            .section-title {
                font-size: 28px;
                color: #2e7d32;
                margin-bottom: 30px;
                padding-bottom: 15px;
                border-bottom: 3px solid #4caf50;
            }

            .overview-grid {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
                gap: 30px;
                margin-bottom: 40px;
            }

            .overview-card {
                background: white;
                padding: 30px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            }

            .overview-card h3 {
                font-size: 18px;
                color: #2e7d32;
                margin-bottom: 15px;
                display: flex;
                align-items: center;
                gap: 10px;
            }

            .overview-card p {
                color: #555;
                line-height: 1.8;
            }

            .icon {
                width: 24px;
                height: 24px;
                color: #4caf50;
            }

            /* 事例タイトルセクション */
            .case-title-section {
                margin-bottom: 60px;
            }

            .case-title-card {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                text-align: center;
            }

            .case-badge {
                display: inline-block;
                background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
                color: white;
                padding: 8px 20px;
                border-radius: 20px;
                font-size: 13px;
                font-weight: 600;
                margin-bottom: 20px;
            }

            .case-title-card h2 {
                font-size: 32px;
                color: #2e7d32;
                margin-bottom: 25px;
                font-weight: 700;
            }

            .case-meta-info {
                display: flex;
                gap: 30px;
                justify-content: center;
                flex-wrap: wrap;
            }

            .meta-item {
                display: flex;
                align-items: center;
                gap: 8px;
                color: #666;
                font-size: 14px;
            }

            .meta-item svg {
                color: #4caf50;
            }

            /* 課題と解決策 - タイムラインスタイル */
            .challenge-solution-section {
                margin-bottom: 40px;
            }

            .challenge-image-container {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                margin-bottom: 50px;
            }

            .challenge-image-container h3 {
                font-size: 24px;
                color: #ff9800;
                margin-bottom: 25px;
                display: flex;
                align-items: center;
                gap: 12px;
            }

            .challenge-image-wrapper {
                background: #fafafa;
                padding: 30px;
                border-radius: 10px;
                text-align: center;
            }

            .challenge-image-wrapper img {
                max-width: 100%;
                height: auto;
                border-radius: 8px;
            }

            .solution-detailed {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            }

            .solution-detailed h3 {
                font-size: 24px;
                color: #2e7d32;
                margin-bottom: 40px;
                display: flex;
                align-items: center;
                gap: 12px;
            }

            .solution-timeline {
                position: relative;
                padding-left: 50px;
            }

            .solution-timeline::before {
                content: "";
                position: absolute;
                left: 20px;
                top: 0;
                height: calc(100% - 55px);
                width: 3px;
                background: linear-gradient(180deg, #4caf50 0%, #81c784 100%);
            }

            .timeline-item {
                position: relative;
                margin-bottom: 35px;
                padding-bottom: 35px;
                border-bottom: 1px solid #f0f0f0;
            }

            .timeline-item:last-child {
                border-bottom: none;
                margin-bottom: 0;
                padding-bottom: 0;
            }

            .timeline-dot {
                position: absolute;
                left: -38px;
                top: 5px;
                width: 16px;
                height: 16px;
                background: white;
                border: 3px solid #4caf50;
                border-radius: 50%;
                box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.1);
            }

            .timeline-number {
                position: absolute;
                left: -50px;
                top: 0;
                width: 40px;
                height: 40px;
                background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                color: white;
                font-weight: bold;
                font-size: 16px;
                box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
            }

            .timeline-content h4 {
                color: #2e7d32;
                font-size: 17px;
                margin-bottom: 12px;
                font-weight: 600;
            }

            .timeline-content p {
                color: #555;
                line-height: 1.8;
                font-size: 14px;
            }

            /* 課題と解決策 - 新しいカードレイアウト */
            .challenge-solution-cards {
                margin-bottom: 40px;
            }

            .cards-container {
                display: grid;
                gap: 30px;
            }

            .challenge-card,
            .solution-card {
                background: white;
                border-radius: 16px;
                padding: 40px;
                box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
                position: relative;
                overflow: hidden;
            }

            .challenge-card::before,
            .solution-card::before {
                content: "";
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 6px;
            }

            .challenge-card::before {
                background: linear-gradient(90deg, #ff9800 0%, #ff5722 100%);
            }

            .solution-card::before {
                background: linear-gradient(90deg, #4caf50 0%, #66bb6a 100%);
            }

            .card-header {
                display: flex;
                align-items: center;
                gap: 15px;
                margin-bottom: 25px;
            }

            .card-icon-wrapper {
                width: 60px;
                height: 60px;
                border-radius: 12px;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            /* 課題セクション */
            .challenge-solution-section {
                margin-bottom: 40px;
            }
            .challenge-image-container {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                margin-bottom: 50px;
            }
            .challenge-image-container > h3 {
                font-size: 20px;
                color: #ff9800;
                margin-bottom: 28px;
                display: flex;
                align-items: center;
                gap: 10px;
                font-weight: 700;
            }

            .issue-cards {
                display: grid;
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
            .issue-card {
                background: #f8f9ff;
                border: 1.5px solid #dde3f0;
                border-radius: 12px;
                padding: 24px 20px 20px;
                display: flex;
                flex-direction: column;
                gap: 14px;
            }
            .issue-card-title {
                font-size: 16px;
                font-weight: 700;
                color: #333;
                text-align: center;
                line-height: 1.5;
            }
            .issue-card-desc {
                font-size: 13px;
                color: #555;
                text-align: center;
                line-height: 1.7;
            }
            .issue-card-visual {
                background: white;
                border-radius: 8px;
                padding: 16px;
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 10px;
                min-height: 130px;
                justify-content: center;
            }

            .excel-nodes {
                display: flex;
                gap: 8px;
                justify-content: center;
                align-items: center;
            }
            .excel-tag {
                background: #e8f5e9;
                border: 1.5px solid #81c784;
                border-radius: 6px;
                padding: 5px 9px;
                font-size: 11px;
                font-weight: 700;
                color: #2e7d32;
                text-align: center;
                line-height: 1.4;
            }
            .arrow-down {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 0;
            }
            .arrow-down-line {
                width: 2px;
                height: 16px;
                background: #bbb;
            }
            .arrow-down-head {
                width: 0;
                height: 0;
                border-left: 5px solid transparent;
                border-right: 5px solid transparent;
                border-top: 7px solid #bbb;
            }
            .db-ng {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
            }
            .db-icon svg {
                width: 32px;
                height: 32px;
                color: #90a4ae;
            }
            .ng-badge {
                background: #ffebee;
                border: 1.5px solid #ef9a9a;
                border-radius: 4px;
                padding: 2px 10px;
                font-size: 11px;
                font-weight: 700;
                color: #e53935;
            }

            .location-row {
                display: flex;
                align-items: center;
                gap: 10px;
                justify-content: center;
            }
            .location-box {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
            }
            .location-box svg {
                width: 32px;
                height: 32px;
                color: #90a4ae;
            }
            .location-label {
                font-size: 11px;
                color: #666;
                font-weight: 600;
            }
            .q-area {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 4px;
            }
            .q-mark {
                font-size: 28px;
                color: #bdbdbd;
                font-weight: 700;
                line-height: 1;
            }
            .contact-icons {
                display: flex;
                gap: 6px;
                align-items: center;
            }
            .contact-icons svg {
                width: 18px;
                height: 18px;
                color: #90a4ae;
            }
            .time-badge {
                background: #fff3e0;
                border: 1.5px solid #ffcc80;
                border-radius: 20px;
                padding: 3px 12px;
                font-size: 11px;
                color: #e65100;
                font-weight: 700;
            }

            .excel-mock-wrap {
                position: relative;
                width: 100%;
                max-width: 155px;
            }
            .excel-mock {
                width: 100%;
                border-radius: 6px;
                overflow: hidden;
                border: 1.5px solid #ddd;
            }
            .excel-mock-header {
                background: #217346;
                color: white;
                padding: 3px 8px;
                font-size: 10px;
                font-weight: 700;
            }
            .excel-row {
                display: grid;
                grid-template-columns: 1fr 1fr;
                border-bottom: 1px solid #e0e0e0;
            }
            .excel-row:last-child {
                border-bottom: none;
            }
            .excel-cell {
                padding: 3px 6px;
                border-right: 1px solid #e0e0e0;
                color: #333;
                font-size: 10px;
            }
            .excel-cell:last-child {
                border-right: none;
            }
            .excel-cell.hd {
                background: #f5f5f5;
                font-weight: 700;
            }
            .excel-overlay {
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                background: rgba(255, 255, 255, 0.93);
                border: 2px solid #ef5350;
                border-radius: 8px;
                padding: 6px 10px;
                text-align: center;
                white-space: nowrap;
            }
            .excel-overlay-icon {
                font-size: 15px;
            }
            .excel-overlay-text {
                font-size: 10px;
                font-weight: 700;
                color: #c62828;
                line-height: 1.3;
            }
            .risk-badge {
                background: #ffebee;
                border: 1.5px solid #ef9a9a;
                border-radius: 20px;
                padding: 3px 12px;
                font-size: 11px;
                color: #c62828;
                font-weight: 700;
            }

            .solution-card .card-icon-wrapper {
                background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
            }

            .card-icon-wrapper svg {
                width: 32px;
                height: 32px;
            }

            .challenge-card .card-icon-wrapper svg {
                color: #ff9800;
            }

            .solution-card .card-icon-wrapper svg {
                color: #2e7d32;
            }

            .card-header h3 {
                font-size: 24px;
                margin: 0;
            }

            .challenge-card .card-header h3 {
                color: #ff9800;
            }

            .solution-card .card-header h3 {
                color: #2e7d32;
            }

            .card-content {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
                gap: 20px;
            }

            .card-item {
                background: #f9f9f9;
                padding: 20px;
                border-radius: 10px;
                display: flex;
                gap: 12px;
                align-items: flex-start;
                transition: all 0.3s;
            }

            .card-item:hover {
                transform: translateX(5px);
                background: #f5f5f5;
            }

            .item-number {
                width: 28px;
                height: 28px;
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                font-weight: bold;
                font-size: 14px;
                flex-shrink: 0;
            }

            .challenge-card .item-number {
                background: #ff9800;
                color: white;
            }

            .solution-card .item-number {
                background: #4caf50;
                color: white;
            }

            .item-text {
                flex: 1;
                color: #555;
                line-height: 1.6;
                font-size: 14px;
            }

            /* システム構成図 */
            .system-diagram {
                background: white;
                padding: 40px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                margin-bottom: 40px;
            }

            /* システム画面セクション */
            .system-screens {
                display: flex;
                flex-direction: column;
                gap: 40px;
            }

            .screen-card {
                background: white;
                border-radius: 12px;
                overflow: hidden;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
                transition: all 0.3s;
            }

            .screen-card:hover {
                transform: translateY(-5px);
                box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            }

            .screen-image {
                width: 100%;
                background: #f5f5f5;
                padding: 20px;
                display: flex;
                justify-content: center;
                align-items: center;
                min-height: 400px;
            }

            .screen-image img {
                max-width: 100%;
                height: auto;
                border-radius: 8px;
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            }

            .screen-info {
                padding: 30px;
                background: white;
            }

            .screen-info h3 {
                font-size: 20px;
                color: #2e7d32;
                margin-bottom: 12px;
            }

            .screen-info p {
                color: #666;
                line-height: 1.8;
                font-size: 15px;
            }

            .diagram-visual-container {
                background: linear-gradient(135deg, #f5f5f5 0%, #e8f5e9 100%);
                padding: 50px 30px;
                border-radius: 12px;
                margin-top: 25px;
            }

            .diagram-layout {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 50px;
                max-width: 1000px;
                margin: 0 auto;
                align-items: center;
            }

            /* 左側 - 貴社拠点 */
            .company-side {
                background: white;
                padding: 30px;
                border-radius: 12px;
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            }

            .company-header {
                text-align: center;
                margin-bottom: 25px;
                padding-bottom: 15px;
                border-bottom: 2px solid #e0e0e0;
            }

            .company-header h4 {
                color: #2e7d32;
                font-size: 18px;
                margin-bottom: 10px;
            }

            .server-box {
                background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
                color: white;
                padding: 25px;
                border-radius: 10px;
                margin-bottom: 20px;
                text-align: center;
                box-shadow: 0 4px 10px rgba(33, 150, 243, 0.3);
            }

            .server-box h5 {
                font-size: 14px;
                margin-bottom: 8px;
                opacity: 0.9;
            }

            .server-box p {
                font-size: 12px;
                opacity: 0.8;
            }

            .web-system-box {
                background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
                color: white;
                padding: 25px;
                border-radius: 10px;
                text-align: center;
                box-shadow: 0 4px 10px rgba(255, 152, 0, 0.3);
            }

            .web-system-box h5 {
                font-size: 16px;
                margin-bottom: 10px;
            }

            .web-system-box p {
                font-size: 12px;
                opacity: 0.9;
            }

            .badge {
                display: inline-block;
                background: rgba(255, 255, 255, 0.3);
                padding: 4px 12px;
                border-radius: 20px;
                font-size: 11px;
                margin-top: 8px;
            }

            .feature-list {
                margin-top: 15px;
                text-align: left;
            }

            .feature-list li {
                font-size: 11px;
                margin-bottom: 5px;
                padding-left: 15px;
                position: relative;
            }

            .feature-list li::before {
                content: "•";
                position: absolute;
                left: 0;
            }

            /* 右側 - 貴社拠点ABC + クラウド */
            .locations-side {
                display: flex;
                flex-direction: column;
                gap: 25px;
            }

            .location-group {
                background: white;
                padding: 20px;
                border-radius: 10px;
                box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            }

            .location-group h5 {
                color: #2e7d32;
                font-size: 14px;
                margin-bottom: 12px;
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .location-icon {
                width: 30px;
                height: 30px;
                background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
                border-radius: 6px;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            .location-icon svg {
                width: 18px;
                height: 18px;
                color: #2e7d32;
            }

            .user-device {
                display: flex;
                align-items: center;
                gap: 10px;
                padding: 10px;
                background: #f9f9f9;
                border-radius: 6px;
                margin-bottom: 8px;
            }

            .user-device svg {
                width: 20px;
                height: 20px;
                color: #666;
            }

            .user-device span {
                font-size: 13px;
                color: #666;
            }

            .cloud-section {
                background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
                padding: 25px;
                border-radius: 10px;
                border: 2px dashed #2196f3;
            }

            .cloud-section h5 {
                color: #1976d2;
                font-size: 15px;
                margin-bottom: 15px;
                display: flex;
                align-items: center;
                gap: 8px;
            }

            .cloud-icon {
                width: 35px;
                height: 35px;
                color: #1976d2;
            }

            .database-box {
                background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
                color: white;
                padding: 20px;
                border-radius: 8px;
                text-align: center;
                box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
            }

            .database-box svg {
                width: 40px;
                height: 40px;
                margin-bottom: 8px;
            }

            .database-box p {
                font-size: 13px;
                margin: 0;
            }

            /* 接続線 */
            .connection-arrows {
                position: relative;
                text-align: center;
                padding: 20px 0;
            }

            .arrow-text {
                background: white;
                padding: 8px 15px;
                border-radius: 20px;
                display: inline-block;
                font-size: 12px;
                color: #666;
                box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
                margin: 5px 0;
            }

            /* 技術スタック */
            .tech-stack {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
                gap: 20px;
            }

            .tech-category {
                background: white;
                padding: 25px;
                border-radius: 12px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            }

            .tech-category h4 {
                font-size: 16px;
                color: #2e7d32;
                margin-bottom: 15px;
                font-weight: bold;
            }

            .tech-tags {
                display: flex;
                flex-wrap: wrap;
                gap: 8px;
            }

            .tech-tag {
                background: #e8f5e9;
                color: #2e7d32;
                padding: 6px 14px;
                border-radius: 20px;
                font-size: 13px;
                font-weight: 500;
            }

            /* 成果セクション */
            .results-grid {
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
                gap: 25px;
            }

            .result-card {
                background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
                color: white;
                padding: 30px;
                border-radius: 12px;
                text-align: center;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            }

            .result-value {
                font-size: 42px;
                font-weight: bold;
                margin-bottom: 10px;
            }

            .result-label {
                font-size: 14px;
                opacity: 0.95;
            }

            /* 注意事項ボックス */
            .info-box {
                background: #e3f2fd;
                border-left: 4px solid #2196f3;
                padding: 20px 25px;
                margin: 30px 0;
                border-radius: 8px;
            }

            .info-box h4 {
                color: #1976d2;
                font-size: 16px;
                margin-bottom: 10px;
            }

            .info-box p {
                color: #666;
                font-size: 14px;
                line-height: 1.7;
            }

            /* CTAセクション */
            .cta-section {
                background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f4 100%);
                padding: 60px 5%;
                text-align: center;
            }

            .cta-content {
                max-width: 800px;
                margin: 0 auto;
            }

            .cta-section h2 {
                font-size: 32px;
                color: #2e7d32;
                margin-bottom: 20px;
            }

            .cta-section p {
                font-size: 16px;
                color: #555;
                margin-bottom: 30px;
            }

            .cta-buttons {
                display: flex;
                gap: 20px;
                justify-content: center;
                flex-wrap: wrap;
            }

            .btn {
                padding: 15px 40px;
                border-radius: 30px;
                text-decoration: none;
                font-weight: bold;
                font-size: 16px;
                transition: all 0.3s;
                display: inline-block;
            }

            .btn-primary {
                background: #4caf50;
                color: white;
            }

            .btn-primary:hover {
                background: #45a049;
                transform: translateY(-2px);
                box-shadow: 0 6px 20px rgba(76, 175, 80, 0.3);
            }

            .btn-secondary {
                background: white;
                color: #4caf50;
                border: 2px solid #4caf50;
            }

            .btn-secondary:hover {
                background: #4caf50;
                color: white;
            }

            /* フッター */
            footer {
                background: #68d391;
                color: #fff;
                position: relative;
            }

            .footer-inner {
                max-width: 1200px;
                margin: 0 auto;
                padding: 60px 40px 40px;
                position: relative;
                z-index: 1;
            }

            .footer-top {
                display: grid;
                grid-template-columns: 280px 1fr;
                gap: 60px;
                padding-bottom: 48px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.2);
                margin-bottom: 40px;
                align-items: start;
            }

            .footer-brand {
                display: flex;
                flex-direction: column;
                gap: 20px;
            }

            .footer-logo {
                font-size: 20px;
                font-weight: 900;
                color: #fff;
                letter-spacing: -0.02em;
                display: flex;
                align-items: center;
                gap: 10px;
            }

            .footer-address {
                font-size: 13px;
                color: rgba(255, 255, 255, 0.75);
                line-height: 1.7;
                display: flex;
                align-items: flex-start;
                gap: 6px;
                margin: 0;
            }

            .footer-icon {
                width: 15px;
                height: 15px;
                flex-shrink: 0;
                margin-top: 2px;
                color: #fff;
            }

            .footer-tel {
                display: flex;
                align-items: center;
                gap: 14px;
                text-decoration: none;
                color: #fff;
                font-size: 18px;
                font-weight: 700;
                letter-spacing: 0.04em;
                transition: opacity 0.2s;
            }
            .footer-tel:hover {
                opacity: 0.7;
            }

            .footer-tel-circle {
                width: 40px;
                height: 40px;
                border-radius: 50%;
                border: 1.5px solid rgba(255, 255, 255, 0.8);
                display: flex;
                align-items: center;
                justify-content: center;
                flex-shrink: 0;
                color: #fff;
            }
            .footer-tel-circle svg {
                width: 18px;
                height: 18px;
            }

            .footer-nav-grid {
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }

            .footer-nav-group-title {
                font-size: 10px;
                font-weight: 700;
                letter-spacing: 0.22em;
                color: rgba(255, 255, 255, 0.6);
                text-transform: uppercase;
                margin-bottom: 16px;
                display: flex;
                align-items: center;
                gap: 8px;
            }
            .footer-nav-group-title::before {
                content: "";
                display: inline-block;
                width: 16px;
                height: 2px;
                background: rgba(255, 255, 255, 0.5);
                border-radius: 2px;
            }

            .footer-nav-group ul {
                list-style: none;
                padding: 0;
                margin: 0;
                display: flex;
                flex-direction: column;
                gap: 10px;
            }

            .footer-nav-group ul li a {
                font-size: 13px;
                color: rgba(255, 255, 255, 0.75);
                text-decoration: none;
                transition: color 0.2s;
                display: flex;
                align-items: center;
                gap: 6px;
            }
            .footer-nav-group ul li a::before {
                content: "›";
                font-size: 15px;
                color: rgba(255, 255, 255, 0.5);
                opacity: 0.7;
            }
            .footer-nav-group ul li a:hover {
                color: #fff;
            }

            .footer-bottom {
                display: flex;
                align-items: center;
                justify-content: space-between;
                gap: 20px;
                flex-wrap: wrap;
            }

            .copyright {
                font-size: 12px;
                color: rgba(255, 255, 255, 0.5);
            }

            @media (max-width: 768px) {
                .footer-top {
                    grid-template-columns: 1fr;
                    gap: 40px;
                }
                .footer-nav-grid {
                    grid-template-columns: 1fr 1fr;
                    gap: 24px;
                }
                .footer-bottom {
                    flex-direction: column;
                    align-items: flex-start;
                    gap: 12px;
                }
                .footer-inner {
                    padding: 40px 24px 32px;
                }
            }

            /* =========================
            レスポンシブ
            ========================= */
            @media (max-width: 968px) {
                .diagram-layout {
                    grid-template-columns: 1fr;
                }
                .card-content {
                    grid-template-columns: 1fr;
                }
                .issue-cards {
                    grid-template-columns: 1fr;
                }
                .challenge-image-container {
                    padding: 24px;
                }
                .solution-detailed {
                    padding: 24px;
                }
                .system-diagram {
                    padding: 24px;
                }
                .case-title-card {
                    padding: 28px 20px;
                }
            }

            @media (max-width: 768px) {
                .hero {
                    padding: 50px 5% 40px;
                }
                .hero h1 {
                    font-size: clamp(20px, 5vw, 28px);
                }
                .container {
                    padding: 24px 4%;
                }
                .section {
                    margin-bottom: 28px;
                }
                .section-title {
                    font-size: 22px;
                }
                .case-title-card h2 {
                    font-size: 22px;
                }
                .solution-timeline {
                    padding-left: 44px;
                }
                .solution-timeline::before {
                    left: 15px; /* バッジ中心: 44-44=0, 0+30/2=15px */
                    top: 0;
                }
                .timeline-number {
                    left: -44px;
                    width: 30px;
                    height: 30px;
                    font-size: 14px;
                }
                .challenge-image-container,
                .solution-detailed {
                    padding: 20px 16px;
                }
                .challenge-image-container > h3,
                .solution-detailed h3 {
                    font-size: 18px;
                }
                .issue-cards {
                    grid-template-columns: 1fr;
                    gap: 16px;
                }
                .cta-section {
                    padding: 40px 5%;
                }
                .cta-section h2 {
                    font-size: 22px;
                }
                .cta-section p {
                    font-size: 14px;
                }
                .cta-buttons {
                    flex-direction: column;
                    align-items: stretch;
                }
                .btn {
                    width: 100%;
                    text-align: center;
                    padding: 14px 24px;
                    font-size: 15px;
                }
                .overview-grid {
                    grid-template-columns: 1fr;
                }
                .tech-stack {
                    grid-template-columns: repeat(2, 1fr);
                }
                .system-diagram {
                    padding: 20px 16px;
                }
                .challenge-image-wrapper {
                    padding: 16px;
                }
                .breadcrumb {
                    font-size: 12px;
                }
                .hero-meta {
                    gap: 12px;
                    font-size: 13px;
                }
                .case-meta-info {
                    gap: 12px;
                }
            }

            @media (max-width: 480px) {
                .tech-stack {
                    grid-template-columns: 1fr;
                }
                .solution-timeline {
                    padding-left: 38px;
                }
                .solution-timeline::before {
                    left: 13px; /* バッジ中心: 38-38=0, 0+26/2=13px */
                    top: 0;
                }
                .timeline-number {
                    left: -38px;
                    width: 26px;
                    height: 26px;
                    font-size: 12px;
                }
                .case-title-card h2 {
                    font-size: 18px;
                }
            }