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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border: 1px solid #e9ecef;
}

.card h3 {
    color: #667eea;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #495057;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 50px;
}

.btn-icon {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #6c757d;
    cursor: pointer;
    padding: 5px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 5px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
}

.btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.device-list {
    margin: 1rem 0;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 10px;
}

.device-item {
    padding: 12px;
    border-bottom: 1px solid #f8f9fa;
    cursor: pointer;
    transition: background 0.2s;
}

.device-item:hover {
    background: #f8f9fa;
}

.device-item.selected {
    background: #e7f3ff;
    border-left: 4px solid #667eea;
}

.device-name {
    font-weight: 600;
    color: #495057;
}

.device-info {
    font-size: 0.9rem;
    color: #6c757d;
    margin-top: 4px;
}

.status {
    margin-top: 1rem;
    padding: 12px;
    border-radius: 8px;
    background: #f8f9fa;
}

.status.connected {
    background: #d4edda;
    color: #155724;
}

.status.disconnected {
    background: #f8d7da;
    color: #721c24;
}

.console-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 1rem;
}

#at-command-select {
    flex: 1;
    padding: 10px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
}

.console-output {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.log-entry {
    padding: 8px 0;
    border-bottom: 1px solid #2d2d2d;
}

.log-entry .timestamp {
    color: #6c757d;
}

.log-entry.info {
    color: #17a2b8;
}

.log-entry.success {
    color: #28a745;
}

.log-entry.error {
    color: #dc3545;
}

.log-entry.command {
    color: #ffc107;
}

.log-entry.response {
    color: #20c997;
}

.progress-container {
    margin-top: 1rem;
}

.progress-bar {
    height: 10px;
    background: #e9ecef;
    border-radius: 5px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    margin-top: 5px;
    font-weight: 600;
    color: #667eea;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background: #f8f9fa;
    color: #6c757d;
    border-top: 1px solid #e9ecef;
}

.warning {
    color: #dc3545;
    margin-top: 10px;
    font-weight: 600;
}

.notes {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1rem;
    margin-top: 1rem;
    border-radius: 4px;
}

.notes ul {
    margin: 0.5rem 0 0 1.5rem;
}

.notes li {
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }
    
    .card {
        margin: 1rem;
        padding: 1rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        margin: 5px 0;
    }
}