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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3a8a 0%, #3b0764 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
    position: relative;
    margin: 0;
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: float linear infinite;
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

.container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 30px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
    max-width: 650px;
    width: 100%;
    padding: 60px;
    text-align: center;
    animation: slideIn 1s ease-out;
    position: relative;
    z-index: 2;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.8) translateY(50px);
    }

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

.icon {
    font-size: 5em;
    margin-bottom: 20px;
    animation: bounce 2s ease-in-out infinite;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.2));
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

h1 {
    color: #1e293b;
    font-size: 2.8em;
    margin-bottom: 25px;
    font-weight: 700;
    background: linear-gradient(135deg, #1e3a8a, #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeIn 1s ease-in 0.3s both;
}

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

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

.description {
    color: #475569;
    font-size: 1.15em;
    line-height: 1.7;
    margin-bottom: 30px;
    animation: fadeIn 1s ease-in 0.5s both;
}

.author {
    color: #7c3aed;
    font-size: 1.4em;
    font-weight: 700;
    margin-bottom: 40px;
    animation: fadeIn 1s ease-in 0.7s both;
    text-shadow: 0 2px 10px rgba(124, 58, 237, 0.3);
}

.btn-start {
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    font-size: 1.3em;
    font-weight: 700;
    padding: 18px 60px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 15px 35px rgba(59, 130, 246, 0.4);
    animation: fadeIn 1s ease-in 0.9s both, pulse 2s ease-in-out 2s infinite;
    text-transform: uppercase;
    letter-spacing: 1px;
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 15px 35px rgba(59, 130, 246, 0.4);
    }

    50% {
        box-shadow: 0 15px 45px rgba(59, 130, 246, 0.6);
    }
}

.btn-start:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 20px 50px rgba(59, 130, 246, 0.6);
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
}

.btn-start:active {
    transform: translateY(-2px) scale(1.02);
}

.glow {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
    top: -150px;
    right: -150px;
    animation: rotate 10s linear infinite;
    pointer-events: none;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}