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

        :root {
            --gradient-1: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            --gradient-2: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
            --gradient-3: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            --transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: #f8fafc;
            color: white;
            overflow-x: hidden;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .intro-wrapper {
            position: relative;
            width: 100%;
            max-width: 450px;
            height: 85vh;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            align-items: center;
            padding: 2rem;
            border-radius: 24px;
            box-shadow: var(--shadow);
            overflow: hidden;
            background: var(--gradient-1);
            transition: var(--transition);
        }

        .logo {
            position: absolute;
            top: 2rem;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.15);
            border-radius: 16px;
            display: flex;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(10px);
            z-index: 10;
            animation: pulse 2s infinite;
        }

        .logo svg {
            width: 32px;
            height: 32px;
        }

        .logo path {
            fill: white;
        }

        .slides-container {
            position: relative;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .intro-card {
            position: absolute;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 2rem;
            opacity: 0;
            transform: translateX(100%);
            transition: var(--transition);
            z-index: 1;
        }

        .intro-card.active {
            opacity: 1;
            transform: translateX(0);
            z-index: 10;
        }

        .intro-card.prev {
            transform: translateX(-100%);
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            transform: translateY(20px);
            opacity: 0;
            transition: var(--transition);
        }

        .intro-card.active h1 {
            transform: translateY(0);
            opacity: 1;
            transition-delay: 0.2s;
        }

        p {
            font-size: 1.25rem;
            font-weight: 400;
            opacity: 0;
            transform: translateY(10px);
            transition: var(--transition);
            max-width: 80%;
            line-height: 1.6;
        }

        .intro-card.active p {
            transform: translateY(0);
            opacity: 1;
            transition-delay: 0.4s;
        }

        .controls {
            position: relative;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            z-index: 20;
            margin-bottom: 2rem;
        }

        .dots {
            display: flex;
            gap: 10px;
            margin-bottom: 1.5rem;
        }

        .dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .dot.active {
            background: white;
            transform: scale(1.2);
        }

        .dot::after {
            content: '';
            position: absolute;
            width: 0;
            height: 100%;
            top: 0;
            left: 0;
            background: white;
            transition: width 0.5s ease;
        }

        .dot.active::after {
            width: 100%;
        }

        #nextBtn {
            background: white;
            color: #2563eb;
            border: none;
            padding: 0.9rem 2.5rem;
            font-family: 'Inter', sans-serif;
            font-weight: 600;
            font-size: 1.05rem;
            border-radius: 50px;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
            position: relative;
            overflow: hidden;
            z-index: 2;
        }

        #nextBtn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }

        #nextBtn:active {
            transform: translateY(0);
        }

        #nextBtn::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            transform: translateX(-100%);
            transition: transform 0.8s ease;
            z-index: -1;
        }

        #nextBtn:hover::after {
            transform: translateX(100%);
        }

        .particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
        }

        .particle {
            position: absolute;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.6);
            animation: float 15s infinite linear;
        }

        @keyframes float {
            0% {
                transform: translateY(0) translateX(0) rotate(0deg);
                opacity: 1;
            }
            100% {
                transform: translateY(-100vh) translateX(100px) rotate(720deg);
                opacity: 0;
            }
        }

        @keyframes pulse {
            0% {
                box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4);
            }
            70% {
                box-shadow: 0 0 0 10px rgba(255, 255, 255, 0);
            }
            100% {
                box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
            }
        }

        @media (max-width: 480px) {
            .intro-wrapper {
                height: 90vh;
                padding: 1.5rem;
                border-radius: 20px;
            }
            
            h1 {
                font-size: 2.1rem;
            }
            
            p {
                font-size: 1.1rem;
                max-width: 90%;
            }
            
            #nextBtn {
                padding: 0.8rem 2.2rem;
                font-size: 1rem;
            }
        }