/* CSS変数定義 */
        :root {
            --primary-color: #0075c1;
            --primary-dark: #004d82;
            --primary-light: #0056a3;
            --line-color: #00C300;
            --line-dark: #00A000;
            --accent-yellow: #FFE066;
            --text-dark: #2c3e50;
            --text-gray: #666;
            --bg-gray: #f8f9fa;
            --border-color: #e9ecef;
            --radius-small: 8px;
            --radius-medium: 12px;
            --radius-large: 15px;
            --shadow-light: 0 2px 10px rgba(0,0,0,0.05);
            --shadow-medium: 0 8px 25px rgba(0, 117, 193, 0.15);
        }

        /* リセット・基本設定 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            overflow-x: hidden;
        }

        body {
            font-family: 'Hiragino Sans', 'Yu Gothic Medium', 'Meiryo', sans-serif;
            line-height: 1.7;
            color: #333;
            background: white;
            width: 100%;
            max-width: 100%;
        }

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

        .main-content {
            padding: 40px;
            max-width: 1200px;
            margin: 0 auto;
        }

        /* ヘッダー */
        .hero-header {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .hero-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, var(--primary-color), #4ECDC4, #45B7D1, #96CEB4);
        }

        .header-top {
            background: rgba(255,255,255,0.1);
            padding: 15px 40px;
            backdrop-filter: blur(10px);
        }

        .header-nav-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .pico-nav {
            color: rgba(255,255,255,0.8);
            font-size: 0.75em;
        }

        .pico-nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .pico-nav a:hover {
            text-decoration: underline;
        }

        .pico-nav span {
            margin: 0 8px;
            color: rgba(255,255,255,0.6);
        }

        .meta-info {
            color: rgba(255,255,255,0.8);
            font-size: 0.85em;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .meta-badge {
            background: rgba(255,255,255,0.2);
            color: white;
            padding: 4px 12px;
            border-radius: var(--radius-medium);
            font-size: 0.8em;
            font-weight: 500;
            border: 1px solid rgba(255,255,255,0.3);
        }

        .header-main {
            padding: 60px 40px 40px;
            text-align: center;
        }

        .header-title {
            font-size: 2.4em;
            margin-bottom: 20px;
            font-weight: 700;
            line-height: 1.3;
        }

        .header-subtitle {
            font-size: 1.3em;
            color: var(--accent-yellow);
            font-weight: 600;
            margin-bottom: 25px;
            background: rgba(255,224,102,0.2);
            padding: 12px 24px;
            border-radius: 25px;
            display: inline-block;
            border: 2px solid var(--accent-yellow);
        }

        .header-intro {
            font-size: 1.1em;
            line-height: 1.8;
            max-width: 800px;
            margin: 0 auto 30px;
            color: rgba(255,255,255,0.95);
        }

        .highlight {
            background: rgba(255,224,102,0.3);
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
            color: var(--accent-yellow);
        }

        .header-actions {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            max-width: 600px;
            margin: 0 auto 40px;
        }

        .header-stats {
            background: rgba(255,255,255,0.1);
            padding: 25px 40px;
            backdrop-filter: blur(10px);
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            text-align: center;
        }

        .stat-item {
            color: rgba(255,255,255,0.9);
            font-size: 0.9em;
        }

        .stat-number {
            display: block;
            font-size: 1.6em;
            font-weight: 700;
            color: white;
            margin-bottom: 5px;
        }

        /* 共通ボタンスタイル */
        .btn {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 18px 24px;
            border-radius: var(--radius-large);
            text-decoration: none;
            font-weight: 600;
            font-size: 1em;
            transition: all 0.3s ease;
            gap: 8px;
            cursor: pointer;
        }

        .btn:hover {
            transform: translateY(-2px);
            text-decoration: none;
        }

        .btn-line {
            background: var(--line-color);
            color: white;
            border: 2px solid var(--line-color);
        }

        .btn-line:hover {
            background: var(--line-dark);
            border-color: var(--line-dark);
            color: white;
            box-shadow: 0 5px 15px rgba(0, 195, 0, 0.3);
        }

        .btn-primary {
            background: rgba(255,255,255,0.2);
            color: white;
            border: 2px solid white;
            backdrop-filter: blur(10px);
        }

        .btn-primary:hover {
            background: white;
            color: var(--primary-color);
        }

        .btn-contact {
            background: var(--primary-color);
            color: white;
            border: 3px solid var(--primary-color);
        }

        .btn-contact:hover {
            background: var(--primary-light);
            border-color: var(--primary-light);
            color: white;
            box-shadow: 0 5px 15px rgba(0, 117, 193, 0.3);
        }

        /* セクション共通 */
        .content-section {
            margin-bottom: 50px;
            padding-bottom: 30px;
            border-bottom: 2px solid #f0f0f0;
        }

        .content-section:last-child {
            border-bottom: none;
        }

        .section-header {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 3px solid var(--primary-color);
        }

        .section-emoji {
            font-size: 2.2em;
            margin-right: 15px;
        }

        .section-title {
            font-size: 1.6em;
            font-weight: 600;
            color: var(--text-dark);
        }

        /* グリッドレイアウト */
        .grid {
            display: grid;
            gap: 20px;
        }

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

        .grid-tools {
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
        }

        /* カード共通スタイル */
        .card {
            background: var(--bg-gray);
            border-radius: var(--radius-medium);
            padding: 25px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-light);
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
        }

        /* ツールカード */
        .tool-card {
            border-left: 5px solid var(--primary-color);
            text-decoration: none;
            color: inherit;
            display: block;
        }

        .tool-card:hover {
            background: #e3f2fd;
            border-left-color: var(--primary-light);
            text-decoration: none;
            color: inherit;
        }

        .tool-card:target {
            animation: highlight-flash 2s ease-in-out;
            border-left-color: #ff6b35;
        }

        @keyframes highlight-flash {
            0%, 50% { 
                background: #fff3cd; 
                border-left-color: #ff6b35;
                transform: scale(1.02);
            }
            100% { 
                background: var(--bg-gray); 
                border-left-color: var(--primary-color);
                transform: scale(1);
            }
        }

        .tool-name {
            font-weight: 600;
            font-size: 1.2em;
            color: var(--text-dark);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .tool-name-content {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .tool-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            background: white;
            border: 2px solid var(--border-color);
        }

        .tool-difficulty {
            font-size: 0.8em;
            color: #f39c12;
        }

        .external-link-icon {
            font-size: 1.1em;
            color: var(--primary-color);
            opacity: 0.7;
            transition: all 0.3s ease;
        }

        .tool-card:hover .external-link-icon {
            opacity: 1;
            transform: translateX(3px);
        }

        .tool-description {
            color: #333;
            margin-bottom: 15px;
            line-height: 1.6;
        }

        .tool-usecase {
            background: #e8f5e8;
            padding: 10px 15px;
            border-radius: var(--radius-small);
            font-size: 0.95em;
            color: #2e7d32;
            border: 1px solid #c8e6c9;
            margin-bottom: 10px;
        }

        .tool-example {
            background: #fff3e0;
            padding: 10px 15px 10px 35px;
            border-radius: var(--radius-small);
            font-size: 0.9em;
            color: #ef6c00;
            border: 1px solid #ffcc02;
            font-style: italic;
            position: relative;
        }

        .tool-example::before {
            content: "💡";
            position: absolute;
            left: 12px;
            top: 10px;
            font-size: 1em;
        }

        /* スペシャルセクション */
        .getting-started-section {
            background: var(--bg-gray);
            border-radius: var(--radius-large);
            padding: 40px;
            margin-bottom: 40px;
            border: 2px solid var(--border-color);
        }

        .getting-started-header {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
        }

        .getting-started-emoji {
            font-size: 2.5em;
            margin-right: 15px;
        }

        .getting-started-title {
            font-size: 1.8em;
            font-weight: 700;
            color: var(--text-dark);
        }

        .getting-started-subtitle {
            text-align: center;
            color: #7f8c8d;
            margin-bottom: 30px;
            font-size: 1.1em;
        }

        .getting-started-item {
            background: white;
            border: 2px solid var(--primary-color);
            border-radius: var(--radius-medium);
            padding: 25px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .getting-started-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
        }

        .getting-started-icon {
            font-size: 2.5em;
            margin-bottom: 15px;
        }

        .getting-started-problem {
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 10px;
            font-size: 1.1em;
        }

        .getting-started-arrow {
            font-size: 1.5em;
            color: var(--primary-color);
            margin: 8px 0;
            font-weight: bold;
        }

        .getting-started-solution {
            background: var(--primary-color);
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 600;
            margin-bottom: 10px;
            display: inline-block;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .getting-started-solution:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 117, 193, 0.3);
            text-decoration: none;
            color: white;
        }

        .getting-started-example {
            font-size: 0.9em;
            color: var(--text-gray);
            font-style: italic;
        }

        .difficulty-legend {
            background: var(--bg-gray);
            border-radius: var(--radius-medium);
            padding: 25px;
            margin-bottom: 40px;
            border: 1px solid var(--border-color);
        }

        .difficulty-legend-title {
            font-size: 1.2em;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 20px;
            text-align: center;
        }

        .difficulty-item {
            background: white;
            padding: 20px;
            border-radius: var(--radius-small);
            border: 2px solid var(--border-color);
            text-align: center;
        }

        .difficulty-stars {
            font-size: 1.3em;
            color: #f39c12;
            margin-bottom: 8px;
        }

        .difficulty-label {
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 5px;
        }

        .difficulty-desc {
            font-size: 0.9em;
            color: #6c757d;
        }

        .highlight-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: white;
            padding: 40px;
            border-radius: var(--radius-large);
            margin: 40px 0;
        }

        .highlight-section h3 {
            font-size: 1.6em;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .highlight-item {
            background: rgba(255,255,255,0.1);
            padding: 20px;
            border-radius: 10px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.2);
        }

        .highlight-item-title {
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--accent-yellow);
        }

        .warning-section {
            background: #fff8e1;
            border: 2px solid #ffc107;
            border-radius: var(--radius-medium);
            padding: 30px;
            margin: 40px 0;
        }

        .warning-title {
            display: flex;
            align-items: center;
            font-size: 1.4em;
            font-weight: 600;
            color: #f57c00;
            margin-bottom: 20px;
            gap: 10px;
        }

        .warning-list {
            list-style: none;
            counter-reset: warning-counter;
        }

        .warning-list li {
            counter-increment: warning-counter;
            margin-bottom: 15px;
            padding-left: 40px;
            position: relative;
            line-height: 1.6;
        }

        .warning-list li::before {
            content: counter(warning-counter);
            position: absolute;
            left: 0;
            top: 0;
            background: #ff9800;
            color: white;
            width: 25px;
            height: 25px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 0.9em;
        }

        /* FAQ */
        .faq-item {
            margin-bottom: 25px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 10px;
            font-size: 1.1em;
        }

        .faq-answer {
            color: #555;
            padding-left: 20px;
            line-height: 1.6;
        }

        .about-section {
            background: var(--bg-gray);
            padding: 30px 40px;
            margin: 40px 0;
            border-radius: var(--radius-medium);
            border-top: 3px solid var(--primary-color);
        }

        .about-content {
            text-align: center;
            color: var(--text-gray);
            line-height: 1.7;
        }

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

        /* フッター */
        .footer {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            padding: 30px;
            text-align: center;
            margin-top: 50px;
        }

        .footer-link {
            display: inline-block;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .footer-link:hover {
            transform: scale(1.05);
        }

        .footer-logo {
            max-height: 50px;
            width: auto;
        }

        /* ボタンコンテナ */
        .line-button-container {
            text-align: center;
            margin: 40px 0;
        }

        .line-friend-button {
            display: inline-block;
            background-color: var(--line-color);
            color: white;
            text-decoration: none;
            padding: 18px 32px;
            border-radius: 30px;
            font-weight: bold;
            font-size: 16px;
            line-height: 1.2;
            border: 3px solid var(--line-color);
            transition: all 0.3s ease;
        }

        .line-friend-button:hover {
            background-color: var(--line-dark);
            border-color: var(--line-dark);
            text-decoration: none;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 195, 0, 0.3);
        }

        .dual-button-container {
            text-align: center;
            margin: 40px 0;
            padding: 30px 20px;
            background: var(--bg-gray);
            border-radius: var(--radius-large);
            border: 2px solid var(--border-color);
        }

        .dual-button-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            max-width: 600px;
            margin: 0 auto;
        }

        .dual-button-item {
            background: white;
            border-radius: var(--radius-medium);
            padding: 20px;
            border: 2px solid transparent;
            transition: all 0.3s ease;
        }

        .dual-button-item.line-target {
            border-color: var(--line-color);
        }

        .dual-button-item.contact-target {
            border-color: var(--primary-color);
        }

        .dual-button-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

        .dual-button-label {
            font-size: 0.9em;
            color: var(--text-gray);
            margin-bottom: 15px;
            font-weight: 500;
        }

        .dual-button {
            display: inline-block;
            padding: 18px 24px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: bold;
            font-size: 14px;
            line-height: 1.3;
            transition: all 0.3s ease;
            width: 100%;
            box-sizing: border-box;
        }

        .dual-button.line-style {
            background-color: var(--line-color);
            color: white;
            border: 3px solid var(--line-color);
        }

        .dual-button.line-style:hover {
            background-color: var(--line-dark);
            border-color: var(--line-dark);
            text-decoration: none;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 195, 0, 0.3);
        }

        .dual-button.contact-style {
            background-color: var(--primary-color);
            color: white;
            border: 3px solid var(--primary-color);
        }

        .dual-button.contact-style:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-light);
            text-decoration: none;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 117, 193, 0.3);
        }

        /* 注釈ボックス */
        .note-box {
            background: #f0f8ff;
            border: 1px solid #b3d9ff;
            border-radius: var(--radius-small);
            padding: 15px 15px 15px 35px;
            margin: 15px 0;
            position: relative;
        }

        .note-box::before {
            content: "💡";
            position: absolute;
            left: 15px;
            top: 15px;
            font-size: 1.2em;
        }

        .note-box-content {
            color: var(--primary-color);
        }

        .warning {
            color: #e74c3c;
            font-weight: 500;
        }

        /* レスポンシブ */
        @media (max-width: 768px) {
            .header-top, .header-main, .main-content, .about-section {
                padding-left: 20px;
                padding-right: 20px;
            }

            .about-section {
                margin: 30px 0;
            }

            .header-title {
                font-size: 1.8em;
            }

            .header-actions, .header-stats, .dual-button-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .grid-tools, .grid-auto {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .section-title {
                font-size: 1.3em;
            }

            .getting-started-section {
                padding: 25px;
            }

            .getting-started-title {
                font-size: 1.5em;
            }

            .dual-button-container {
                margin: 30px 0;
                padding: 25px 15px;
            }
        }

        @media (max-width: 480px) {
            .header-title {
                font-size: 1.5em;
            }

            .header-subtitle {
                font-size: 1.1em;
                padding: 10px 20px;
            }

            .tool-card {
                padding: 20px;
            }

            .getting-started-emoji {
                font-size: 2em;
                margin-right: 10px;
            }

            .about-section {
                padding: 20px 15px;
            }
        }