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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 15px;
            position: relative;
        }

        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 20px;
        }

        .developer-card {
            background: white;
            padding: 15px 20px;
            border-radius: 15px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            display: flex;
            align-items: center;
            gap: 15px;
            transition: all 0.3s ease;
        }

        .developer-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
        }

        .developer-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            font-weight: bold;
            color: white;
            flex-shrink: 0;
            overflow: hidden;
        }

        .developer-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .developer-info h4 {
            margin: 0;
            color: #333;
            font-size: 14px;
            font-weight: 600;
        }

        .developer-info p {
            margin: 3px 0 0 0;
            color: #666;
            font-size: 12px;
        }

        .help-button {
            background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            box-shadow: 0 5px 15px rgba(238, 90, 111, 0.4);
        }

        .help-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(238, 90, 111, 0.6);
        }

        .container {
            background: white;
            padding: 40px 30px;
            border-radius: 25px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            max-width: 900px;
            width: 100%;
            margin: 0 auto;
        }

        h1 {
            color: #333;
            text-align: center;
            margin-bottom: 10px;
            font-size: clamp(24px, 5vw, 36px);
        }

        .subtitle {
            color: #666;
            text-align: center;
            margin-bottom: 35px;
            font-size: clamp(14px, 3vw, 16px);
        }

        .bookmark-box {
            background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
            padding: clamp(30px, 5vw, 50px);
            border-radius: 20px;
            border: 3px dashed #667eea;
            margin: 30px 0;
            text-align: center;
        }

        .drag-instruction {
            font-size: clamp(16px, 4vw, 20px);
            font-weight: bold;
            color: #333;
            margin-bottom: 25px;
        }

        #bookmarkButton {
            display: inline-block;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 16px 40px;
            text-decoration: none;
            border-radius: 12px;
            font-weight: bold;
            font-size: clamp(16px, 3vw, 22px);
            cursor: move;
            box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
            transition: all 0.3s;
            border: none;
            touch-action: none;
        }

        #bookmarkButton:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(102, 126, 234, 0.6);
        }

        .steps {
            background: linear-gradient(135deg, #fff9e6 0%, #fff3cd 100%);
            padding: clamp(20px, 5vw, 35px);
            border-radius: 15px;
            border-left: 5px solid #ffc107;
            margin-top: 30px;
        }

        .steps h3 {
            margin-top: 0;
            color: #f57c00;
            font-size: clamp(18px, 4vw, 24px);
            margin-bottom: 20px;
        }

        .steps ol {
            padding-left: 25px;
            line-height: 2;
        }

        .steps li {
            margin: 12px 0;
            color: #333;
            font-size: clamp(14px, 3vw, 16px);
        }

        .features {
            background: #e3f2fd;
            padding: clamp(20px, 5vw, 35px);
            border-radius: 15px;
            margin-top: 25px;
            border-left: 5px solid #2196F3;
        }

        .features h4 {
            margin-top: 0;
            color: #1976D2;
            font-size: clamp(16px, 4vw, 20px);
            margin-bottom: 15px;
        }

        .features ul {
            list-style: none;
            padding: 0;
        }

        .features li {
            margin: 10px 0;
            color: #333;
            font-size: clamp(13px, 2.5vw, 15px);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .features li:before {
            content: "✓";
            color: #2196F3;
            font-weight: bold;
            font-size: 18px;
        }

        .footer-note {
            text-align: center;
            margin-top: 35px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 12px;
            color: #666;
            font-size: clamp(12px, 2.5vw, 14px);
        }

        @media (max-width: 768px) {
            .container {
                padding: 25px 20px;
            }

            .bookmark-box {
                padding: 25px 15px;
            }

            #bookmarkButton {
                padding: 14px 30px;
            }

            .header-top {
                flex-direction: column;
                align-items: stretch;
            }

            .developer-card {
                justify-content: center;
            }

            .help-button {
                justify-content: center;
            }

            body {
                padding: 10px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 20px 15px;
                border-radius: 20px;
            }

            h1 {
                margin-bottom: 8px;
            }

            .subtitle {
                margin-bottom: 25px;
            }

            .bookmark-box {
                margin: 20px 0;
            }

            .drag-instruction {
                margin-bottom: 20px;
            }

            .steps ol {
                padding-left: 20px;
            }

            #bookmarkButton {
                display: block;
                width: 100%;
                padding: 14px 20px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }