:root {
    --bg-main: #0b0f19;
    --bg-card: rgba(18, 24, 38, 0.85);
    --bg-card-border: rgba(255, 255, 255, 0.08);
    --bg-hover: rgba(255, 255, 255, 0.05);
    --bg-input: #151c2e;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-blue: #3b82f6;
    --accent-blue-glow: rgba(59, 130, 246, 0.25);
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-purple: #a855f7;
    --accent-rose: #f43f5e;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    
    --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

.app-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 16px 24px;
    box-shadow: var(--shadow-card);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent-blue), #1d4ed8);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 0 16px var(--accent-blue-glow);
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.brand-subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
}

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

.status-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid var(--bg-card-border);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    position: relative;
}

.status-connected {
    background-color: var(--accent-emerald);
    box-shadow: 0 0 8px var(--accent-emerald);
}

.status-connecting {
    background-color: var(--accent-amber);
    box-shadow: 0 0 8px var(--accent-amber);
}

.status-disconnected {
    background-color: var(--accent-rose);
    box-shadow: 0 0 8px var(--accent-rose);
}

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.kpi-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.kpi-card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.15);
}

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-blue { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }
.icon-emerald { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.icon-purple { background: rgba(168, 85, 247, 0.15); color: var(--accent-purple); }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }

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

.kpi-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
}

.kpi-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin: 4px 0;
}

.kpi-subtext {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* Tabs */
.tabs-nav {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--bg-card-border);
    padding-bottom: 8px;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: #fff;
    background: var(--accent-blue);
    box-shadow: 0 0 14px var(--accent-blue-glow);
}

.tab-badge {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 2px 7px;
    font-size: 0.75rem;
}

/* Panels */
.tab-panel {
    display: none;
}

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

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    padding: 14px 18px;
    border-radius: var(--radius-md);
}

.panel-actions-left, .panel-actions-right, .filters-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* Inputs & Buttons */
.input-control {
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    color: var(--text-primary);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    outline: none;
    min-width: 220px;
    transition: border-color 0.2s ease;
}

.input-control:focus {
    border-color: var(--accent-blue);
}

.btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.78rem;
}

.btn-primary {
    background: var(--accent-blue);
    color: #fff;
}
.btn-primary:hover {
    background: #2563eb;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border-color: var(--bg-card-border);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
}

.btn-danger {
    background: var(--accent-rose);
    color: #fff;
}
.btn-danger:hover {
    background: #e11d48;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.toggle-switch input {
    display: none;
}

.toggle-slider {
    width: 36px;
    height: 20px;
    background: #334155;
    border-radius: 20px;
    position: relative;
    transition: background 0.2s;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.2s;
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--accent-blue);
}

.toggle-switch input:checked + .toggle-slider::after {
    transform: translateX(16px);
}

.toggle-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Stream Messages Container */
.stream-container {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    height: 600px;
    overflow-y: auto;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: var(--shadow-card);
}

.stream-card {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-left: 4px solid var(--accent-blue);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    animation: fadeInSlide 0.25s ease-out;
}

@keyframes fadeInSlide {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.stream-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
}

.stream-topic {
    font-family: 'JetBrains Mono', monospace;
    color: #60a5fa;
    font-weight: 600;
}

.stream-time {
    color: var(--text-muted);
}

.stream-payload {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    background: rgba(0, 0, 0, 0.35);
    padding: 8px 10px;
    border-radius: 4px;
    color: #e2e8f0;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Table */
.table-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    overflow-x: auto;
    box-shadow: var(--shadow-card);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    text-align: left;
}

.data-table th {
    background: rgba(15, 23, 42, 0.95);
    color: var(--text-secondary);
    font-weight: 600;
    padding: 12px 16px;
    border-bottom: 1px solid var(--bg-card-border);
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    vertical-align: middle;
}

.data-table tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.topic-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    background: rgba(59, 130, 246, 0.12);
    color: #93c5fd;
    padding: 2px 8px;
    border-radius: 4px;
    display: inline-block;
}

.payload-preview {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: #cbd5e1;
    max-width: 450px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.json-pill {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
    font-size: 0.7rem;
    padding: 1px 6px;
    border-radius: 10px;
    margin-left: 6px;
}

/* Pagination */
.pagination-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 14px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.pagination-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Topics Grid */
.topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 900px) {
    .topics-grid { grid-template-columns: 1fr; }
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--bg-card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

.topics-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 500px;
    overflow-y: auto;
}

.topic-row-item {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topic-row-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: #93c5fd;
}

.topic-row-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.stats-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.bar-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
}

.bar-track {
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* Config Grid */
.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.config-item {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    padding: 14px;
}

.config-item label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    display: block;
    margin-bottom: 4px;
}

.config-val {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

.config-val a {
    color: #60a5fa;
    text-decoration: none;
}

.danger-zone {
    border-top: 1px solid rgba(244, 63, 94, 0.2);
    padding-top: 20px;
    margin-top: 10px;
}

.danger-zone h4 {
    color: var(--accent-rose);
    margin-bottom: 6px;
}

.danger-zone p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: var(--bg-main);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 700px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--bg-card-border);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
}

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-meta-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    background: var(--bg-card);
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
}

.meta-label {
    color: var(--text-muted);
    font-weight: 500;
}

.meta-val {
    color: var(--text-primary);
    font-weight: 600;
}

.topic-box {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    background: rgba(59, 130, 246, 0.1);
    color: #93c5fd;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    margin-top: 4px;
}

.payload-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.code-box {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    background: #060911;
    border: 1px solid var(--bg-card-border);
    padding: 14px;
    border-radius: var(--radius-sm);
    color: #38bdf8;
    max-height: 350px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Empty State & Spinner */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    gap: 12px;
}

.empty-subtext {
    font-size: 0.8rem;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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