:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #161616;
    --bg-hover: #1a1a1a;
    --border-color: #222222;
    --border-light: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --text-muted: #555555;
    --accent-primary: #3b82f6;
    --accent-secondary: #60a5fa;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --online: #22c55e;
    --offline: #6b7280;
    --sidebar-width: 240px;
    --header-height: 60px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-light) var(--bg-primary);
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s, visibility 0.3s;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.login-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-logo {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: 8px;
    color: var(--accent-primary);
}

.login-subtitle {
    color: var(--text-secondary);
    margin-top: 8px;
    font-size: 13px;
    letter-spacing: 2px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input,
.form-group textarea,
.form-group select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--accent-primary);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--danger);
    font-size: 13px;
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: var(--accent-primary);
    color: var(--text-primary);
    padding: 14px 24px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: background var(--transition);
}

.login-btn:hover {
    background: var(--accent-secondary);
}

.login-btn svg {
    width: 18px;
    height: 18px;
}

.login-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.bg-grid {
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 59, 59, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 59, 59, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 6px;
    color: var(--accent-primary);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-left: 2px solid var(--accent-primary);
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-divider {
    height: 1px;
    background: var(--border-color);
    margin: 12px 0;
}

.nav-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 0 16px;
    margin-bottom: 8px;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    color: var(--accent-primary);
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-size: 13px;
    font-weight: 500;
}

.user-role {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: capitalize;
}

.logout-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
}

.logout-btn:hover {
    background: var(--bg-hover);
    color: var(--danger);
}

.logout-btn svg {
    width: 18px;
    height: 18px;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 32px;
    min-height: 100vh;
}

.page-header {
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.header-back {
    display: flex;
    align-items: center;
    gap: 16px;
}

.back-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
}

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

.back-btn svg {
    width: 18px;
    height: 18px;
}

.device-id-text {
    font-size: 12px;
    color: var(--text-muted);
    font-family: monospace;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon svg {
    width: 24px;
    height: 24px;
}

.stat-icon.total {
    background: rgba(255, 59, 59, 0.1);
    color: var(--accent-primary);
}

.stat-icon.online {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.stat-icon.offline {
    background: rgba(107, 114, 128, 0.1);
    color: var(--offline);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 28px;
    font-weight: 600;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.section {
    margin-bottom: 32px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 16px;
    font-weight: 500;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition);
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid var(--danger);
}

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

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

.table-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
}

.data-table th {
    background: var(--bg-tertiary);
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
}

.data-table tbody tr {
    transition: background var(--transition);
    cursor: pointer;
}

.data-table tbody tr:hover {
    background: var(--bg-hover);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.text-cell {
    max-width: 300px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.device-id {
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: -0.3px;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 40px !important;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

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

.status-badge.offline {
    background: rgba(107, 114, 128, 0.1);
    color: var(--offline);
}

.status-badge.large {
    padding: 8px 16px;
    font-size: 13px;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    flex: 1;
    max-width: 400px;
}

.search-box svg {
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.search-box input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    outline: none;
}

.filter-group {
    display: flex;
    gap: 4px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 4px;
}

.filter-btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition);
}

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

.filter-btn.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.device-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    cursor: pointer;
    transition: border-color var(--transition);
}

.device-card:hover {
    border-color: var(--accent-primary);
}

.device-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-dot.offline {
    background: var(--offline);
}

.device-model {
    font-weight: 500;
    flex: 1;
}

.device-tag {
    font-size: 11px;
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.device-id-row {
    display: flex;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.device-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-item .label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-item .value {
    font-size: 13px;
    color: var(--text-secondary);
}

.device-footer {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.last-seen {
    font-size: 12px;
    color: var(--text-muted);
}

.empty-state-card {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px;
    color: var(--text-muted);
}

.empty-state-card svg {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.detail-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
}

.detail-section.full-width {
    grid-column: 1 / -1;
}

.detail-section h3 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-row .label {
    font-size: 13px;
    color: var(--text-muted);
}

.info-row .value {
    font-size: 13px;
}

.tag-form {
    display: flex;
    gap: 12px;
}

.tag-form input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--text-primary);
    outline: none;
}

.tag-form input:focus {
    border-color: var(--accent-primary);
}

.log-status-box {
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.log-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.log-status {
    font-weight: 500;
    text-transform: capitalize;
}

.log-status.taken {
    color: var(--warning);
}

.log-status.success {
    color: var(--success);
}

.log-status.failed {
    color: var(--danger);
}

.log-by,
.log-amount {
    font-size: 13px;
    color: var(--text-secondary);
}

.sms-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 150px;
    gap: 16px;
}

.tabs-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.tabs-header {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 16px 24px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

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

.tab-btn.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-content {
    display: none;
    padding: 24px;
}

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

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.app-item {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
}

.app-name {
    display: block;
    font-size: 13px;
    margin-bottom: 4px;
}

.app-package {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
}

.device-link {
    color: var(--accent-primary);
    font-size: 12px;
}

.device-link:hover {
    text-decoration: underline;
}

.role-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    text-transform: capitalize;
}

.role-badge.admin {
    background: rgba(255, 59, 59, 0.1);
    color: var(--accent-primary);
}

.role-badge.worker {
    background: rgba(107, 114, 128, 0.1);
    color: var(--text-secondary);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    width: 100%;
    max-width: 420px;
    margin: 20px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 500;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--text-muted);
    transition: color var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-content form {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.settings-grid {
    display: grid;
    gap: 24px;
}

.settings-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
}

.settings-section h3 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.settings-section form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.danger-actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.danger-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.danger-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.danger-title {
    font-size: 14px;
}

.danger-desc {
    font-size: 12px;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .devices-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        max-width: none;
    }
}