:root {
    --bg-color: #0f172a; /* Dark Slate background */
    --text-color: #f8fafc; /* Light Slate text */
    --text-muted: #94a3b8; /* Muted Slate text */
    
    /* Vibrant accent colors for the buttons */
    --accent-1: #3b82f6; /* Blue */
    --accent-1-hover: #2563eb; 
    --accent-2: #10b981; /* Emerald */
    --accent-2-hover: #059669;
    --accent-3: #f59e0b; /* Amber */
    --accent-3-hover: #d97706;
    
    --card-bg: rgba(30, 41, 59, 0.7); /* Semi-transparent Slate */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    
    /* Dynamic background with radial gradients for a premium look */
    background-image: 
        radial-gradient(at 0% 0%, hsla(253,16%,17%,1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(225,39%,30%,0.3) 0, transparent 50%), 
        radial-gradient(at 100% 0%, hsla(339,49%,30%,0.3) 0, transparent 50%);
    background-attachment: fixed;
}

.container {
    background-color: var(--card-bg);
    padding: 3rem 2rem;
    border-radius: 24px;
    /* Soft shadow + subtle inner border for glassmorphism effect */
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 
                inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    width: 100%;
    max-width: 480px;
    text-align: center;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    
    /* Entrance animation */
    animation: fadeIn 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(20px);
}

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

header {
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    /* Gradient text */
    background: linear-gradient(135deg, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 300;
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-radius: 16px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    color: #fff;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.1);
    /* Improve rendering */
    transform: translateZ(0); 
}

/* Shine effect on hover */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: skewX(-20deg);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 150%;
}

.btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px -10px rgba(0,0,0,0.5);
}

.btn:active {
    transform: translateY(-1px);
}

/* Individual button styles */
.btn-primary {
    background-color: var(--accent-1);
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    background-color: var(--accent-1-hover);
    box-shadow: 0 6px 20px 0 rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background-color: var(--accent-2);
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.39);
}

.btn-secondary:hover {
    background-color: var(--accent-2-hover);
    box-shadow: 0 6px 20px 0 rgba(16, 185, 129, 0.5);
}

.btn-tertiary {
    background-color: var(--accent-3);
    box-shadow: 0 4px 14px 0 rgba(245, 158, 11, 0.39);
}

.btn-tertiary:hover {
    background-color: var(--accent-3-hover);
    box-shadow: 0 6px 20px 0 rgba(245, 158, 11, 0.5);
}

.btn-text {
    z-index: 1;
}

.btn-icon {
    z-index: 1;
    transition: var(--transition);
}

.btn:hover .btn-icon {
    transform: translateX(6px);
}

footer {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive adjustments for smaller screens */
@media (max-width: 480px) {
    .container {
        padding: 2.5rem 1.5rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: 0.875rem 1.25rem;
        font-size: 1rem;
    }
}