:root {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --bg-hover: #242836;
    --border: #2a2e3d;
    --text: #e1e4ed;
    --text-dim: #8b90a0;
    --accent: #4f8ff7;
    --accent-hover: #3a7be0;
    --red: #ef4444;
    --yellow: #eab308;
    --green: #22c55e;
    --font: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.3px;
}

.header h1 span {
    color: var(--accent);
}

/* Tabs */
.tabs {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0 24px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
}

.tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    color: var(--text-dim);
    font-size: 13px;
    white-space: nowrap;
    transition: all 0.15s;
}

.tab:hover { color: var(--text); background: var(--bg-hover); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab .status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green);
}

.tab .status-dot.stopped { background: var(--text-dim); }
.tab .status-dot.paused { background: var(--yellow); }

.tab .close-tab {
    opacity: 0;
    font-size: 14px;
    color: var(--text-dim);
    cursor: pointer;
    padding: 0 2px;
}
.tab:hover .close-tab { opacity: 1; }
.tab .close-tab:hover { color: var(--red); }

.tab-add {
    padding: 10px 12px;
    cursor: pointer;
    color: var(--text-dim);
    font-size: 16px;
}
.tab-add:hover { color: var(--accent); }

/* Main content */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

/* Trace chooser */
.chooser-input-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    align-items: center;
}

.chooser-input-bar input[type="text"] {
    flex: 1;
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 14px;
    font-family: var(--mono);
    outline: none;
    transition: border-color 0.15s;
}

.chooser-input-bar input[type="text"]:focus {
    border-color: var(--accent);
}

.chooser-input-bar input::placeholder {
    color: var(--text-dim);
}

/* Interval control */
.interval-control {
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.interval-control label {
    font-size: 11px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.interval-control input[type="number"] {
    width: 52px;
    padding: 10px 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 14px;
    font-family: var(--mono);
    text-align: center;
    outline: none;
    -moz-appearance: textfield;
}

.interval-control input[type="number"]::-webkit-inner-spin-button { opacity: 1; }

.interval-control input[type="number"]:focus { border-color: var(--accent); }

.interval-unit {
    font-size: 12px;
    color: var(--text-dim);
}

/* History section (trace chooser list) */
.history-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.history-title {
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dim);
}

.btn-text {
    background: none;
    border: none;
    font-size: 11px;
    color: var(--text-dim);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all 0.15s;
}

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

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.history-table th {
    text-align: left;
    padding: 8px 14px;
    color: var(--text-dim);
    font-weight: 500;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.history-table td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 12px;
}

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

.history-table tbody tr {
    cursor: pointer;
    transition: background 0.1s;
}

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

.history-actions-col {
    width: 40px;
    text-align: center;
}

.history-delete {
    color: var(--text-dim);
    cursor: pointer;
    font-size: 14px;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all 0.1s;
}

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

/* Target bar (in trace view) */
.target-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    align-items: center;
}

.trace-target-display {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
}

.trace-target-label {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--text);
    font-weight: 500;
}

.trace-interval-label {
    font-size: 11px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn {
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: var(--accent);
    color: white;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

/* Banner messages */
.banner {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 13px;
    display: none;
}

.banner.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--red);
    display: block;
}

.banner.warning {
    background: rgba(234, 179, 8, 0.1);
    border: 1px solid rgba(234, 179, 8, 0.3);
    color: var(--yellow);
    display: block;
}

.banner.info {
    background: rgba(79, 143, 247, 0.1);
    border: 1px solid rgba(79, 143, 247, 0.3);
    color: var(--accent);
    display: block;
}

/* Chart */
.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
    height: 220px;
    position: relative;
}

.chart-container .placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-dim);
    font-size: 13px;
}

/* Summary chart */
.summary-chart-container {
    min-height: 120px;
    margin-bottom: 12px;
}

/* Hop table */
.hop-table-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
}

.hop-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.hop-table th {
    text-align: left;
    padding: 10px 12px;
    color: var(--text-dim);
    font-weight: 500;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.hop-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 12px;
}

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

.hop-table tr {
    cursor: pointer;
    transition: background 0.1s;
}

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

.hop-table tr.selected {
    background: rgba(79, 143, 247, 0.1);
}

.hop-table tr.loss td {
    color: var(--red);
}

.hop-table .hop-num {
    color: var(--text-dim);
    width: 40px;
}

.hop-table .latency {
    width: 70px;
    text-align: right;
}

.hop-table .loss-col {
    width: 60px;
    text-align: right;
}

.sparkline-cell {
    width: 120px;
}

.sparkline-cell canvas {
    display: block;
}

/* Status bar */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    font-size: 12px;
    color: var(--text-dim);
}

.status-info {
    display: flex;
    gap: 16px;
}

.status-actions {
    display: flex;
    gap: 8px;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Empty state */
.empty-state {
    text-align: center;
    padding: 40px 24px;
    color: var(--text-dim);
}

.empty-state p {
    font-size: 14px;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 8px;
    font-size: 13px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.2s ease;
}

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