: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;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.login-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.main-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.nav-item {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
}

.nav-item:hover {
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    color: var(--primary);
    background-color: rgba(59, 130, 246, 0.1);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.login-card .logo {
    justify-content: center;
    margin-bottom: 2rem;
}

.login-error {
    color: var(--status-offline);
    font-size: 0.875rem;
    margin-top: 1rem;
    text-align: center;
}

.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;
}

.login-card .btn-primary {
    width: 100%;
    margin-top: 1rem;
}

.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;
    word-break: break-all;
}

.code-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.btn-copy {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-copy:active {
    transform: scale(0.95);
}

.btn-copy.copied {
    color: var(--status-online);
}

.users-list {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.user-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;
}

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

.user-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    height: auto;
}

.user-create-form, #add-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    width: 100%;
}

.user-create-form .btn-primary, #add-form .btn-primary {
    align-self: flex-end;
    margin-top: 0.5rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
    padding: 0.5rem 0;
}

.checkbox-container input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

.checkbox-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.profile-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 400px;
}

.profile-form .btn-primary {
    align-self: flex-start;
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 2rem 0;
}

.success-msg {
    color: var(--status-online);
    text-align: center;
    margin-top: 1rem;
    font-size: 0.875rem;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    width: 100%;
    max-width: 500px;
    margin: 0;
    position: relative;
}

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

.modal-header h2 {
    margin: 0;
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.btn-close:hover {
    color: var(--text-main);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

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

.instances-header .actions {
    display: flex;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
}