:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

/* Navigation logo - small size */
.logo-image {
    height: 35px;
    width: auto;
    max-width: 150px;
    object-fit: contain;
}

.logo-text {
    display: inline-block;
}

/* Hide logo text on small screens */
@media (max-width: 768px) {
    .logo-text {
        display: none;
    }
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* Main content */
main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

/* Hero section */
.hero {
    text-align: center;
    padding: 2rem 0;
}

.hero-logo {
    margin-bottom: 1.5rem;
}

/* Hero logo - moderate size */
.hero-logo-image {
    width: 120px;
    height: auto;
    max-width: 100%;
    max-height: 120px;
    object-fit: contain;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Module grid */
.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

@media (max-width: 768px) {
    .module-grid {
        grid-template-columns: 1fr;
    }
}

.module-card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-align: center;
}

.module-card h2 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.module-card p {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.card-info ul {
    list-style: none;
    padding-left: 1rem;
}

.card-info li {
    padding: 0.25rem 0;
    color: var(--secondary-color);
}

.card-info li::before {
    content: "→ ";
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #1d4ed8;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-danger {
    background-color: var(--error-color);
    color: white;
}

/* Status panel */
.status-panel {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    margin-top: 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.status-panel h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

#device-status ul {
    list-style: none;
}

#device-status li {
    padding: 0.5rem;
    margin: 0.25rem 0;
    border-radius: 4px;
}

.status-ok {
    color: var(--success-color);
    background-color: rgba(34, 197, 94, 0.1);
}

.status-error {
    color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

/* Footer */
footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--secondary-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.btn-logout {
    background-color: #dc3545;
    color: white;
    padding: 8px 16px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.3s;
}

.btn-logout:hover {
    background-color: #c82333;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}