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

:root {
    --bg-color: #0f1419;
    --text-color: #ffffff;
    --accent: #1bd96a;
    --card-bg: #1a2332;
}

[data-theme="light"] {
    --bg-color: #f5f5f5;
    --text-color: #1a1a1a;
    --card-bg: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s ease, color 0.3s ease;
    padding: 20px;
    overflow: hidden;
}

/* Animated background */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(27, 217, 106, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: moveBackground 20s linear infinite;
    z-index: -1;
}

@keyframes moveBackground {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

#themeBtn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: transform 0.3s ease;
}

#themeBtn:hover {
    transform: scale(1.1);
}

.sun-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: inline;
}

[data-theme="light"] .moon-icon {
    display: none;
}

.lang-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 100;
}

#langBtn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

#langBtn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.back-btn {
    position: fixed;
    top: 20px;
    left: 90px;
    z-index: 100;
}

.back-btn a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    padding: 10px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    transition: all 0.3s ease;
}

[data-theme="light"] .back-btn a {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.back-btn a:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(-4px);
}

[data-theme="light"] .back-btn a:hover {
    background: rgba(0, 0, 0, 0.08);
}

.container {
    max-width: 600px;
    width: 100%;
}

.content {
    text-align: center;
    background: var(--card-bg);
    padding: 60px 40px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.6s ease;
}

[data-theme="light"] .content {
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.icon {
    font-size: 80px;
    margin-bottom: 20px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--accent), #3b9cff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    opacity: 0.9;
}

.description {
    font-size: 16px;
    line-height: 1.6;
    opacity: 0.7;
    margin-bottom: 40px;
}

.progress-container {
    margin-top: 40px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #3b9cff);
    border-radius: 10px;
    animation: progress 3s ease-in-out infinite;
}

@keyframes progress {
    0% {
        width: 0%;
    }
    50% {
        width: 70%;
    }
    100% {
        width: 0%;
    }
}

.progress-text {
    font-size: 14px;
    opacity: 0.6;
    font-style: italic;
}

@media (max-width: 768px) {
    .content {
        padding: 40px 30px;
    }
    
    .icon {
        font-size: 60px;
    }
    
    .title {
        font-size: 36px;
    }
    
    .subtitle {
        font-size: 20px;
    }
    
    .description {
        font-size: 14px;
    }
}