:root {
    --primary-color: #1a1a2e;
    --secondary-color: #16213e;
    --accent-color: #e94560;
    --accent-gold: #ffd700;
    --success-color: #00d9ff;
    --danger-color: #ff3860;
    --warning-color: #f7b731;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-hover: #252542;
    --border-color: #2d2d44;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

.sidebar {
    width: 280px;
    height: 100vh;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border-right: 1px solid var(--border-color);
    position: fixed;
    left: 0;
    top: 0;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 32px;
    color: var(--accent-gold);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
}

.logo-sub {
    font-size: 11px;
    color: var(--accent-gold);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.nav-section {
    padding: 20px 16px;
}

.nav-label {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: block;
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: 4px;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: 500;
}

.nav-item a i {
    width: 24px;
    font-size: 16px;
    margin-right: 12px;
}

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

.nav-item.active a {
    background: rgba(233, 69, 96, 0.1);
    color: var(--accent-color);
}

.badge {
    margin-left: auto;
    background: var(--border-color);
    color: var(--text-primary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.badge-online {
    background: rgba(0, 217, 255, 0.2);
    color: var(--success-color);
}

.badge-offline {
    background: rgba(255, 56, 96, 0.2);
    color: var(--danger-color);
}

.badge-warning {
    background: rgba(247, 183, 49, 0.2);
    color: var(--warning-color);
}

.logout a {
    color: var(--danger-color);
}

.logout a:hover {
    background: rgba(255, 56, 96, 0.1);
}

.sidebar-footer {
    margin-top: auto;
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success-color);
}

.version {
    display: block;
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}

.main-content {
    margin-left: 280px;
    min-height: 100vh;
    padding: 24px;
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
}

.header-search {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.header-search i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.header-search input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px 12px 48px;
    color: var(--text-primary);
    font-size: 14px;
    border: none;
}

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

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    color: white;
    font-size: 10px;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    position: relative;
}

.user-profile img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--accent-color);
}

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

.user-name {
    font-size: 14px;
    font-weight: 600;
}

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

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-width: 200px;
    display: none;
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}

.user-dropdown.show {
    display: block;
}

.dropdown-item {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
}

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

.dropdown-item.logout {
    color: var(--danger-color);
    border-top: 1px solid var(--border-color);
    border-radius: 0 0 12px 12px;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 16px;
    position: relative;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-color);
    border-radius: 4px 0 0 4px;
}

.stat-card:nth-child(2)::before { background: var(--success-color); }
.stat-card:nth-child(3)::before { background: var(--danger-color); }
.stat-card:nth-child(4)::before { background: var(--warning-color); }

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.devices { background: rgba(233, 69, 96, 0.1); color: var(--accent-color); }
.stat-icon.online { background: rgba(0, 217, 255, 0.1); color: var(--success-color); }
.stat-icon.offline { background: rgba(255, 56, 96, 0.1); color: var(--danger-color); }
.stat-icon.recycled { background: rgba(247, 183, 49, 0.1); color: var(--warning-color); }

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
}

.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-header h2 {
    font-size: 24px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
}

.page-header h2 i {
    color: var(--accent-color);
}

.page-actions {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #e94560 0%, #ff3860 100%);
    color: white;
}

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

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-success {
    background: rgba(0, 217, 255, 0.2);
    color: var(--success-color);
    border: 1px solid rgba(0, 217, 255, 0.3);
}

.filters-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.devices-container {
    display: grid;
    gap: 20px;
}

.devices-container.grid-view {
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
}

.device-card {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

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

.device-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.status-indicator.online {
    background: var(--success-color);
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 217, 255, 0.7); }
    100% { box-shadow: 0 0 0 10px rgba(0, 217, 255, 0); }
}

.status-indicator.offline {
    background: var(--danger-color);
}

.device-name {
    font-size: 16px;
    font-weight: 600;
}

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

.card-body {
    padding: 20px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}

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

.info-label {
    font-size: 10px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.info-value {
    font-size: 13px;
    font-weight: 500;
    word-break: break-all;
}

.card-actions {
    display: flex;
    gap: 8px;
    padding: 0 20px 20px;
}

.card-actions .btn {
    flex: 1;
    padding: 10px 16px;
    font-size: 12px;
    justify-content: center;
}

.btn-sms {
    background: rgba(0, 217, 255, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(0, 217, 255, 0.2);
}

.btn-send {
    background: linear-gradient(135deg, #e94560 0%, #ff3860 100%);
    color: white;
}

.btn-info {
    background: rgba(247, 183, 49, 0.1);
    color: var(--warning-color);
    border: 1px solid rgba(247, 183, 49, 0.2);
}

.btn-delete {
    background: rgba(255, 56, 96, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(255, 56, 96, 0.2);
    width: 100%;
    margin-top: 8px;
}

.alert {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert-info {
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.2);
    color: var(--success-color);
}

.alert-warning {
    background: rgba(247, 183, 49, 0.1);
    border: 1px solid rgba(247, 183, 49, 0.2);
    color: var(--worning-color);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-full {
    max-width: 1000px;
}

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

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

.sms-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sms-toolbar {
    padding: 16px 24px;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.toolbar-btn {
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 13px;
}

.sms-list {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
}

.sms-message {
    display: flex;
    margin-bottom: 20px;
}

.sms-message.incoming {
    justify-content: flex-start;
}

.sms-message.outgoing {
    justify-content: flex-end;
}

.message-bubble {
    max-width: 70%;
    padding: 14px 18px;
    border-radius: 18px;
}

.incoming .message-bubble {
    background: var(--bg-hover);
    border-bottom-left-radius: 4px;
}

.outgoing .message-bubble {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--danger-color) 100%);
    border-bottom-right-radius: 4px;
}

.message-sender {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 4px;
}

.message-body {
    font-size: 14px;
    color: var(--text-primary);
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
    font-size: 11px;
    color: var(--text-secondary);
}

.device-details {
    padding: 24px;
}

.detail-section {
    margin-bottom: 24px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.section-header i {
    color: var(--accent-color);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.detail-item {
    background: var(--bg-dark);
    padding: 14px 16px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.detail-item label {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    display: block;
    margin-bottom: 4px;
}

.sim-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.sim-card {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
}

.sim-card.active {
    border-color: var(--success-color);
}

.sim-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
    z-index: 9999;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .devices-container.grid-view {
        grid-template-columns: 1fr;
    }
}