body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.container {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 90%;
}

/* Einstellungen */
.settings {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 20px;
    margin: 20px 0;
    text-align: left;
}

.settings h3 {
    margin-top: 0;
    text-align: center;
    color: #FFD700;
}

.setting-group {
    margin: 15px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.setting-group label {
    font-weight: bold;
    margin-right: 10px;
}

.setting-group input {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 1em;
    width: 80px;
    text-align: center;
}

.setting-group input:focus {
    outline: none;
    border-color: #FFD700;
}

/* Status und Timer */
.status {
    font-size: 3em;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.training {
    color: #4CAF50;
    animation: pulse 1s infinite;
}

.pause {
    color: #FF9800;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.timer {
    font-size: 4em;
    font-weight: bold;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.progress {
    font-size: 1.2em;
    margin: 20px 0;
    opacity: 0.8;
}

.volume-info {
    margin: 10px 0;
    font-size: 1.1em;
    opacity: 0.9;
}

/* Buttons */
.controls {
    margin: 20px 0;
}

button {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 15px 30px;
    margin: 10px;
    border-radius: 25px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.toggle-settings {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 10px 20px;
    margin: 10px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.toggle-settings:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* File Input */
.file-input {
    margin: 20px 0;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

input[type="file"] {
    color: white;
}

/* Utility Classes */
.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 480px) {
    .container {
        padding: 15px;
        width: 95%;
    }
    
    .status {
        font-size: 2.5em;
    }
    
    .timer {
        font-size: 3em;
    }
    
    .setting-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .setting-group label {
        margin-bottom: 5px;
    }
    
    .setting-group input {
        width: 100%;
    }
}