* {
            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: 20px;
        }

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

        header {
            text-align: center;
            color: white;
            margin-bottom: 40px;
        }

        h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }

        .search-box {
            display: flex;
            gap: 10px;
            margin-bottom: 40px;
        }

        #usernameInput {
            flex: 1;
            padding: 18px;
            border: none;
            border-radius: 50px;
            font-size: 16px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }

        #searchBtn {
            padding: 18px 35px;
            background: white;
            color: #667eea;
            border: none;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }

        #searchBtn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.3);
        }

        .profile-card {
            background: white;
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            display: none;
            animation: fadeIn 0.5s;
        }

        .profile-card.active {
            display: block;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .profile-header {
            display: flex;
            gap: 30px;
            margin-bottom: 30px;
        }

        .avatar {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            border: 5px solid #667eea;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .profile-info {
            flex: 1;
        }

        .profile-name {
            font-size: 2em;
            color: #333;
            margin-bottom: 5px;
        }

        .profile-username {
            color: #667eea;
            font-size: 1.2em;
            margin-bottom: 15px;
        }

        .profile-bio {
            color: #666;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .profile-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-item {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
        }

        .stat-value {
            font-size: 2em;
            font-weight: bold;
            color: #667eea;
            margin-bottom: 5px;
        }

        .stat-label {
            color: #666;
            font-size: 0.9em;
            text-transform: uppercase;
        }

        .profile-details {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin-bottom: 30px;
        }

        .detail-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #666;
        }

        .detail-icon {
            font-size: 1.2em;
        }

        .repos-section {
            margin-top: 30px;
        }

        .repos-section h3 {
            color: #333;
            margin-bottom: 20px;
            font-size: 1.5em;
        }

        .repos-grid {
            display: grid;
            gap: 15px;
        }

        .repo-card {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #667eea;
            transition: all 0.3s;
            cursor: pointer;
        }

        .repo-card:hover {
            transform: translateX(5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .repo-name {
            font-size: 1.2em;
            font-weight: 600;
            color: #333;
            margin-bottom: 8px;
        }

        .repo-description {
            color: #666;
            margin-bottom: 15px;
            font-size: 14px;
        }

        .repo-stats {
            display: flex;
            gap: 20px;
            font-size: 14px;
            color: #999;
        }

        .repo-stat {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .loading {
            text-align: center;
            color: white;
            font-size: 1.5em;
            padding: 60px;
            display: none;
        }

        .loading.active {
            display: block;
        }

        .error {
            background: white;
            border-radius: 20px;
            padding: 40px;
            text-align: center;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            display: none;
        }

        .error.active {
            display: block;
            animation: shake 0.5s;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-10px); }
            75% { transform: translateX(10px); }
        }

        .error-icon {
            font-size: 4em;
            margin-bottom: 20px;
        }

        .error-message {
            color: #666;
            font-size: 1.2em;
        }

        @media (max-width: 768px) {
            .profile-header {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }

            .profile-stats {
                grid-template-columns: 1fr;
            }

            .profile-details {
                grid-template-columns: 1fr;
            }
        }