* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        :root {
            --primary: #7c3aed;
            --primary-dark: #5b21b6;
            --secondary: #f0abfc;
            --accent: #fbbf24;
            --light: #f8fafc;
            --dark: #1e293b;
            --gray: #64748b;
            --success: #10b981;
            --radius: 12px;
            --shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #f8fafc 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            padding: 20px;
        }

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

        header {
            text-align: center;
            padding: 40px 20px;
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
        }

        header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
        }

        h1 {
            font-size: 2.8rem;
            background: linear-gradient(90deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 10px;
        }

        .subtitle {
            font-size: 1.2rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto 30px;
        }

        .premium-badge {
            display: inline-block;
            background: linear-gradient(90deg, var(--accent), #f59e0b);
            color: white;
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 20px;
            box-shadow: 0 4px 12px rgba(251, 191, 36, 0.3);
        }

        .main-app {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }

        @media (max-width: 900px) {
            .main-app {
                grid-template-columns: 1fr;
            }
        }

        .card {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 30px;
            transition: transform 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
        }

        .card-header {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid #f1f5f9;
        }

        .card-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: white;
            font-size: 1.5rem;
        }

        .card-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dark);
        }

        textarea {
            width: 100%;
            height: 200px;
            padding: 20px;
            border: 2px solid #e2e8f0;
            border-radius: var(--radius);
            font-size: 1rem;
            resize: vertical;
            transition: border 0.3s;
            margin-bottom: 20px;
        }

        textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
        }

        .controls {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 25px;
        }

        .control-group {
            flex: 1;
            min-width: 200px;
        }

        label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--dark);
        }

        select, input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e2e8f0;
            border-radius: var(--radius);
            font-size: 1rem;
            background: white;
            cursor: pointer;
        }

        select:focus, input:focus {
            outline: none;
            border-color: var(--primary);
        }

        .btn {
            padding: 14px 28px;
            background: linear-gradient(90deg, var(--primary), var(--primary-dark));
            color: white;
            border: none;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-top: 10px;
            width: 100%;
        }

        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(124, 58, 237, 0.2);
        }

        .btn-secondary {
            background: linear-gradient(90deg, #64748b, #475569);
        }

        .btn-secondary:hover {
            box-shadow: 0 10px 20px rgba(100, 116, 139, 0.2);
        }

        .hashtag-container {
            min-height: 300px;
            max-height: 400px;
            overflow-y: auto;
            padding: 20px;
            border-radius: var(--radius);
            background: #f8fafc;
            border: 2px dashed #cbd5e1;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-content: flex-start;
        }

        .hashtag {
            background: white;
            padding: 12px 18px;
            border-radius: 50px;
            font-weight: 600;
            color: var(--primary-dark);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
            cursor: pointer;
            transition: all 0.2s;
            border: 2px solid #e9d5ff;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hashtag:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(124, 58, 237, 0.2);
        }

        .hashtag i {
            font-size: 0.9rem;
        }

        .hashtag-copied {
            background: var(--success);
            color: white;
            border-color: var(--success);
        }

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

        .results-stats {
            color: var(--gray);
            font-size: 0.95rem;
        }

        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }

        .feature-card {
            background: white;
            border-radius: var(--radius);
            padding: 25px;
            box-shadow: var(--shadow);
            text-align: center;
            transition: transform 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-5px);
        }

        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, #a78bfa, var(--secondary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }

        .feature-title {
            font-size: 1.3rem;
            margin-bottom: 12px;
            color: var(--dark);
        }

        .feature-desc {
            color: var(--gray);
            font-size: 0.95rem;
        }

        footer {
            text-align: center;
            padding: 30px;
            margin-top: 40px;
            color: var(--gray);
            font-size: 0.9rem;
            border-top: 1px solid #e2e8f0;
        }

        .highlight {
            color: var(--primary);
            font-weight: 700;
        }

        .notification {
            position: fixed;
            top: 30px;
            right: 30px;
            background: white;
            padding: 18px 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            display: flex;
            align-items: center;
            gap: 15px;
            z-index: 1000;
            transform: translateX(150%);
            transition: transform 0.4s ease;
            border-left: 5px solid var(--success);
        }

        .notification.show {
            transform: translateX(0);
        }

        .notification-icon {
            width: 40px;
            height: 40px;
            background: var(--success);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
        }

        .mobile-only {
            display: none;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            
            .subtitle {
                font-size: 1rem;
            }
            
            .card {
                padding: 20px;
            }
            
            .main-app {
                gap: 20px;
            }
            
            .mobile-only {
                display: block;
            }
            
            .notification {
                top: 20px;
                right: 20px;
                left: 20px;
                transform: translateY(-150%);
            }
            
            .notification.show {
                transform: translateY(0);
            }
        }

        /* Animation for hashtag generation */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .hashtag {
            animation: fadeIn 0.3s ease forwards;
        }

        /* Scrollbar styling */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: #f1f5f9;
            border-radius: 10px;
        }

        ::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 10px;
        }