:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --status-online: #10b981;
    --status-offline: #ef4444;
    --status-sent: #3b82f6;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo svg {
    color: var(--primary);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.form-group {
    margin-bottom: 1rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s, transform 0.1s;
    font-family: inherit;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    width: 100%;
    margin-top: 0.5rem;
}

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

.btn-primary:active {
    transform: translateY(1px);
}

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    color: var(--text-muted);
    border-radius: 6px;
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.instances-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.instances-header h2 {
    margin-bottom: 0;
}

.instances-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.instance-item {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s;
}

.instance-item:hover {
    transform: translateX(4px);
    border-color: rgba(255, 255, 255, 0.2);
}

.instance-info h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.instance-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
    display: flex;
    gap: 1rem;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.1);
}

.status-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-badge.status-offline::before { background-color: var(--status-offline); }
.status-badge.status-sent::before { background-color: var(--status-sent); }
.status-badge.status-unknown::before { background-color: var(--text-muted); }

.delete-btn {
    color: var(--status-offline);
    background: transparent;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.delete-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.helper-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.code-block {
    background-color: #0f172a;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    position: relative;
    font-family: monospace;
    font-size: 0.875rem;
    display: flex;
    flex-direction: column;
}

.code-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 0.25rem;
    font-family: 'Inter', sans-serif;
}

.code-block code {
    color: #34d399;
}