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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    color: #333;
}

.app {
    min-height: 100vh;
}

/* Navbar Styles */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-brand h2 {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background 0.3s;
}

.nav-link:hover, .nav-link.active {
    background: rgba(255,255,255,0.2);
}

.btn-logout {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.3s;
}

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

/* Main Content */
.main-content {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.main-content.fullscreen {
    padding: 0;
    max-width: 100%;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

/* Button Styles */
button {
    background: #667eea;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
}

button:hover {
    background: #5a67d8;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* Loading States */
.loading {
    text-align: center;
    padding: 2rem;
    color: #667eea;
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        justify-content: center;
    }
    
    .main-content {
        padding: 1rem;
    }
}