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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Login-Seite */
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.login-box h1 {
    color: #667eea;
    font-size: 32px;
    margin-bottom: 8px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin-bottom: 30px;
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.error-message {
    color: #e74c3c;
    font-size: 14px;
    margin-bottom: 15px;
    min-height: 20px;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

/* Hub-Seite */
.hub-container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hub-header {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hub-header h1 {
    color: #667eea;
    font-size: 28px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-info span {
    color: #333;
    font-weight: 500;
}

.btn-logout {
    padding: 8px 20px;
    background: #e74c3c;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    transition: background 0.3s;
}

.btn-logout:hover {
    background: #c0392b;
}

.hub-content {
    max-width: 1200px;
    margin: 60px auto;
    padding: 0 40px;
}

.hub-content h2 {
    color: white;
    font-size: 36px;
    margin-bottom: 10px;
}

.welcome-text {
    color: rgba(255, 255, 255, 0.9);
    font-size: 18px;
    margin-bottom: 40px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.service-card.add-service {
    background: rgba(255, 255, 255, 0.3);
    border: 2px dashed rgba(255, 255, 255, 0.5);
    color: white;
}

.service-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.service-card h3 {
    color: #333;
    font-size: 24px;
    margin-bottom: 10px;
}

.service-card.add-service h3 {
    color: white;
}

.service-card p {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
}

.service-card.add-service p {
    color: rgba(255, 255, 255, 0.9);
}

.btn-service {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-service:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.hub-footer {
    text-align: center;
    padding: 30px;
    color: white;
    font-size: 14px;
}

#session-timer {
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hub-header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
    }
    
    .hub-content {
        padding: 0 20px;
        margin: 30px auto;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
}