body { 
            font-family: 'Segoe UI', Arial, sans-serif; 
            margin: 0; 
            padding: 20px; 
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }
        .container { 
            max-width: 900px; 
            margin: 0 auto; 
            background: white; 
            padding: 40px; 
            border-radius: 15px; 
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }
        .header { 
            text-align: center; 
            margin-bottom: 30px; 
            padding-bottom: 20px;
            border-bottom: 2px solid #f0f0f0;
        }
        .header h1 {
            color: #2c3e50;
            font-size: 2.5rem;
            margin-bottom: 10px;
            background: linear-gradient(45deg, #3498db, #2c3e50);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .code { 
            background: #f8f9fa; 
            padding: 15px; 
            border-radius: 8px; 
            font-family: 'Courier New', monospace; 
            margin: 15px 0;
            border-left: 4px solid #3498db;
            font-size: 1.1rem;
        }
        .btn { 
            background: linear-gradient(45deg, #3498db, #2980b9);
            color: white; 
            padding: 12px 25px; 
            text-decoration: none; 
            border-radius: 8px; 
            display: inline-block; 
            margin: 10px 0;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
        }
        .success { color: #27ae60; }
        .warning { color: #f39c12; }
        .info-box { 
            background: linear-gradient(135deg, #e3f2fd, #bbdefb);
            padding: 20px; 
            border-radius: 10px; 
            margin: 20px 0;
            border-left: 4px solid #2196f3;
        }
        .auth-notice { 
            background: linear-gradient(135deg, #fff3e0, #ffecb3);
            border: 1px solid #ffd54f; 
            padding: 20px; 
            border-radius: 10px; 
            margin: 20px 0;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin: 25px 0;
        }
        .feature-card {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #3498db;
            transition: transform 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2rem;
            margin-bottom: 10px;
        }
        .product-list {
            columns: 2;
            gap: 20px;
        }
        .product-list li {
            margin-bottom: 10px;
            padding: 8px 12px;
            background: #f8f9fa;
            border-radius: 6px;
            break-inside: avoid;
        }
        .platform-tabs {
            display: flex;
            margin: 20px 0;
            border-bottom: 2px solid #f0f0f0;
        }
        .platform-tab {
            appearance: none;
            background: transparent;
            border: 0;
            color: inherit;
            font: inherit;
            padding: 12px 24px;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }
        .platform-tab.active {
            border-bottom-color: #3498db;
            color: #3498db;
            font-weight: bold;
        }
        .platform-content {
            display: none;
        }
        .platform-content.active {
            display: block;
        }
        .code {
            overflow-x: auto;
            white-space: nowrap;
        }

        .copy-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 32px;
        }

        .btn-primary {
            background: #2563eb;
        }

        .btn-success {
            background: #16803c;
        }

        .btn:focus-visible,
        .platform-tab:focus-visible {
            outline: 3px solid #f59e0b;
            outline-offset: 3px;
        }

        .btn:disabled {
            cursor: wait;
            opacity: 0.7;
        }

        .toast {
            position: fixed;
            right: 20px;
            bottom: 20px;
            max-width: min(360px, calc(100vw - 40px));
            padding: 12px 16px;
            border-radius: 6px;
            color: #fff;
            background: #166534;
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
        }

        .toast[data-tone='error'] {
            background: #b42318;
        }

        .lead {
            margin-top: 0;
            color: #7f8c8d;
            font-size: 1.2rem;
        }

        .shop-badge {
            display: inline-block;
            margin-top: 10px;
            padding: 8px 20px;
            border-radius: 20px;
            color: #fff;
            background: #c2412d;
        }

        .panel-title {
            margin-top: 0;
        }

        .warning-title {
            color: #b45309;
        }

        .info-title {
            color: #1d4ed8;
        }

        .notice-text {
            color: #b42318;
            font-style: italic;
        }

        @media (max-width: 600px) {
            body {
                padding: 12px;
            }

            .container {
                padding: 24px 18px;
            }

            .header h1 {
                font-size: 2rem;
            }

            .platform-tab {
                flex: 1;
                padding-inline: 12px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                scroll-behavior: auto !important;
                transition: none !important;
            }
        }