:root {
    --bg-color: #f4f4f9;
    --panel-bg: #ffffff;
    --text-color: #333333;
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --error-color: #dc3545;
    --success-color: #28a745;
    --border-color: #dddddd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Login Screen */
#login-screen {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-box {
    background: var(--panel-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
}

.login-box input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
}

/* Dashboard */
header {
    background-color: #222;
    color: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

main {
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
}

.panel {
    background: var(--panel-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

button:hover {
    background-color: var(--primary-hover);
}

/* Media List */
.media-list {
    list-style: none;
    padding: 0;
}

.media-list li {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Nodes Grid */
.nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.node-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    background: #fafafa;
}

.node-card h3 {
    margin-top: 0;
    display: flex;
    justify-content: space-between;
}

.status-dot {
    height: 12px;
    width: 12px;
    border-radius: 50%;
    display: inline-block;
}

.status-online { background-color: var(--success-color); }
.status-offline { background-color: var(--error-color); }

/* Modal */
.modal {
    display: none; 
    position: fixed; 
    z-index: 1; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.4); 
}

.modal-content {
    background-color: var(--panel-bg);
    margin: 10% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover,
.close-btn:focus {
    color: black;
    text-decoration: none;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.form-info {
    background: #e9ecef;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
    word-break: break-all;
}

.error { color: var(--error-color); }
.success { color: var(--success-color); }

/* --- Panel Extensions --- */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.action-btn {
    padding: 8px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.9rem;
    margin-left: 10px;
}

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

.setup-logs {
    background: #1e1e1e;
    color: #00ff00;
    padding: 12px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    height: 180px;
    overflow-y: auto;
    margin-top: 15px;
    border-radius: 4px;
    display: none;
    border: 1px solid #333;
}

.setup-logs.active {
    display: block;
}

.modal-content h2 { margin-top: 0; }
.modal-content p { font-size: 14px; color: #666; margin-bottom: 20px; }