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

html, body {
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    width: 100%;
    height: 100%;
}

body {
    background: linear-gradient(180deg, #4a90d9 0%, #87CEEB 40%, #b8d4e3 100%);
}

#canvas {
    display: block;
    width: 100vw;
    height: 100vh;
}

#loading {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    color: #fff;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 20px 40px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 200;
    transition: opacity 0.5s;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

#ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 100;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 40px;
}

.header {
    text-align: center;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 24px 40px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    max-width: 700px;
    margin: 0 auto;
}

.header h1 {
    font-size: 3.5rem;
    color: #fff;
    margin-bottom: 10px;
    letter-spacing: 2px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.header p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin: 0 auto;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.progress-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    text-align: center;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 20px 24px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.progress-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: var(--progress, 15%);
    background: linear-gradient(90deg, #FFD700, #FFA500);
    border-radius: 10px;
    transition: width 0.3s;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.progress-text {
    display: block;
    margin-top: 10px;
    font-size: 2rem;
    color: #fff;
    font-weight: bold;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.controls {
    position: absolute;
    top: 40px;
    right: 40px;
    pointer-events: auto;
}

#lang-toggle {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 10px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    color: #fff;
    transition: all 0.3s;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

#lang-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
}

.footer {
    text-align: center;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 12px 24px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    max-width: 400px;
    margin: 0 auto;
}

.footer p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
    }

    #ui-overlay {
        padding: 20px;
    }

    .header, .progress-container, .footer {
        padding: 16px 20px;
    }
}