:root {
            --primary: #6366f1;
            --primary-hover: #4f46e5;
            --bg-gradient: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --text-main: #ffffff;
            --text-muted: #94a3b8;
        }

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

        body {
            font-family: 'Outfit', sans-serif;
            background: var(--bg-gradient);
            color: var(--text-main);
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .container {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--glass-border);
            padding: 3rem;
            border-radius: 24px;
            width: 100%;
            max-width: 480px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            text-align: center;
            transform: translateY(0);
            transition: transform 0.3s ease;
        }

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

        h1 {
            font-weight: 600;
            font-size: 2rem;
            margin-bottom: 0.5rem;
            background: linear-gradient(to right, #818cf8, #c084fc);
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        p.subtitle {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-bottom: 2rem;
        }

        .input-skupina {
            position: relative;
            margin-bottom: 1.5rem;
        }

        input[type="url"] {
            width: 100%;
            padding: 1rem 1.2rem;
            background: rgba(0, 0, 0, 0.2);
            border: 1px solid var(--glass-border);
            border-radius: 12px;
            color: #fff;
            font-size: 1rem;
            font-family: inherit;
            transition: all 0.3s ease;
            outline: none;
        }

        input[type="url"]:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
            background: rgba(0, 0, 0, 0.3);
        }

        input[type="url"]::placeholder {
            color: rgba(255, 255, 255, 0.3);
        }

        button {
            width: 100%;
            padding: 1rem;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: inherit;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
        }

        button:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
        }

        button:active {
            transform: translateY(0);
        }

        button:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none;
        }

        #vysledek {
            margin-top: 2rem;
            padding: 1.5rem;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            display: none;
            animation: fadeIn 0.4s ease-out;
            text-align: left;
        }

        #vysledek.visible {
            display: block;
        }

        .label {
            display: block;
            text-transform: uppercase;
            font-size: 0.75rem;
            letter-spacing: 1px;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }

        .title-obsah {
            font-size: 1.1rem;
            line-height: 1.5;
            color: #fff;
            font-weight: 500;
            word-break: break-word;
        }

        .error {
            color: #f87171;
        }

        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
            margin-right: 8px;
            vertical-align: middle;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }