/* ═══════════════════════════════════════════════════════════════════════════════
   LatencyView — UI
   ═══════════════════════════════════════════════════════════════════════════════ */

:root {
    --bg:         #000000;
    --surface:    #060606;
    --surface-2:  #0a0a0a;
    --border:     #2e2a24;
    --border-sub: #1e1b17;
    --accent:     #c4aa82;
    --accent-dim: #6b5738;
    --accent-fg:  #dcc494;
    --text-1:     #f4eee0;
    --text-2:     #b5aa98;
    --text-3:     #706758;
    --mono:       'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 300;
    background: var(--bg);
    color: var(--text-1);
    color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; }

::selection {
    background: rgba(212, 184, 132, 0.2);
    color: var(--text-1);
}

body {
    margin: 0;
    height: 100vh;
    overflow: hidden;
}

/* ── View switching ───────────────────────────────────────────────────────────── */

#landing, #workspace { display: none; width: 100%; height: 100%; }

body.view-landing   #landing   { display: flex; }
body.view-workspace #workspace { display: flex; }

/* ═════════════════════════════════════════════════════════════════════════════════
   Landing
   ═════════════════════════════════════════════════════════════════════════════════ */

#landing {
    align-items: center;
    justify-content: center;
    padding: 64px 40px;
}

.landing-content {
    width: 100%;
    max-width: 460px;
}

.brand {
    font-family: 'Cormorant Garamond', serif;
    font-size: 4rem;
    font-weight: 300;
    letter-spacing: 0.04em;
    color: var(--text-1);
    line-height: 1;
    margin-bottom: 24px;
}

.subtitle {
    font-size: 0.68rem;
    font-weight: 300;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--text-2);
    line-height: 1.7;
    margin-bottom: 72px;
}

/* ── Steps ────────────────────────────────────────────────────────────────────── */

.steps {
    margin-bottom: 56px;
}

.step {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-sub);
}

.step:first-child {
    border-top: 1px solid var(--border-sub);
}

.step-num {
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 400;
    color: var(--accent-dim);
    letter-spacing: 0.08em;
    flex-shrink: 0;
}

.step-text {
    font-size: 0.88rem;
    font-weight: 300;
    line-height: 1.65;
    color: var(--text-2);
}

.step-text strong {
    color: var(--text-1);
    font-weight: 400;
}

/* ── Buttons ──────────────────────────────────────────────────────────────────── */

.btn-primary {
    display: inline-flex;
    align-items: center;
    padding: 14px 44px;
    background: transparent;
    color: var(--accent-fg);
    border: 1px solid var(--accent-dim);
    border-radius: 0;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
}

.btn-primary:hover {
    border-color: var(--accent);
    background: rgba(212, 184, 132, 0.05);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 10px 32px;
    background: transparent;
    color: var(--fg-dim);
    border: 1px solid var(--border);
    border-radius: 0;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
    margin-top: 12px;
}

.btn-secondary:hover {
    color: var(--accent-fg);
    border-color: var(--accent-dim);
}

.btn-tool {
    display: inline-flex;
    align-items: center;
    padding: 6px 16px;
    background: transparent;
    color: var(--text-2);
    border: 1px solid var(--border);
    border-radius: 0;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.68rem;
    font-weight: 400;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
}

.btn-tool:hover {
    color: var(--text-1);
    border-color: var(--text-3);
}

.btn-tool:disabled {
    opacity: 0.25;
    cursor: default;
    pointer-events: none;
}

/* ── Status ───────────────────────────────────────────────────────────────────── */

.status {
    margin: 20px 0 0;
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    color: var(--text-3);
    min-height: 1em;
}

/* ═════════════════════════════════════════════════════════════════════════════════
   Workspace
   ═════════════════════════════════════════════════════════════════════════════════ */

#workspace {
    flex-direction: column;
}

/* ── Workspace body ───────────────────────────────────────────────────────────── */

.workspace-body {
    flex: 1;
    display: flex;
    flex-direction: row;
    min-height: 0;
}

/* ═════════════════════════════════════════════════════════════════════════════════
   Main Area (chart / compare)
   ═════════════════════════════════════════════════════════════════════════════════ */

.main-area {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* ── Chart area — generous breathing room on all sides ───────────────────────── */

.chart-area {
    position: relative;
    flex: 1;
    min-height: 0;
    background: var(--bg);
}

#single-view.hidden { display: none; }

/* The canvas fills the entire chart area. All chart content — data lines,
   axis frame, grid lines, tick labels and axis titles — is drawn into the
   canvas itself by render() in src/main.js, so the user can right-click →
   Copy Image and get a complete picture. */
#gpu-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* Legacy DOM legend — replaced by canvas-drawn legend */
#chart-legend { display: none !important; }

/* ═════════════════════════════════════════════════════════════════════════════════
   Sidebar
   ═════════════════════════════════════════════════════════════════════════════════ */

.sidebar {
    width: 280px;
    flex-shrink: 0;
    height: 100%;
    background: var(--surface);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

/* ── Sessions top bar ─────────────────────────────────────────────────────────── */

/* ── Session list ────────────────────────────────────────────────────────────── */

#session-list {
    border-bottom: 1px solid var(--border);
}

.session-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 18px;
    cursor: pointer;
    user-select: none;
}

.session-row:hover {
    background: var(--bg);
}

.session-row.active {
    background: var(--bg);
    border-left: 2px solid var(--text-1);
    padding-left: 16px;
}

.session-row .session-name {
    flex: 1;
    min-width: 0;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    color: var(--text-2);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-row.active .session-name {
    color: var(--text-1);
}

.session-row .session-remove {
    flex-shrink: 0;
    background: transparent;
    border: none;
    color: var(--text-3);
    font-size: 0.95rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 2px;
    opacity: 0;
}

.session-row:hover .session-remove {
    opacity: 1;
}

.session-row .session-remove:hover {
    color: var(--text-1);
}

.session-actions {
    display: flex;
    gap: 8px;
    padding: 12px 18px 16px;
}

.btn-session-action {
    flex: 1;
    padding: 7px 0;
    background: transparent;
    color: var(--text-2);
    border: 1px solid var(--border);
    border-radius: 0;
    font-family: var(--mono);
    font-size: 0.60rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
}

.btn-session-action:hover {
    color: var(--text-1);
    border-color: var(--text-3);
}

.btn-session-action:disabled {
    opacity: 0.25;
    cursor: default;
    pointer-events: none;
}

/* ── Chart controls ──────────────────────────────────────────────────────────── */

#chart-controls {
    border-bottom: 1px solid var(--border);
}

#single-controls,
#compare-controls {
    display: none;
}

#single-controls.visible,
#compare-controls.visible {
    display: block;
}

#single-controls.folded .control-row {
    display: none;
}

.controls-block {
    padding-bottom: 10px;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 5px 18px;
}

.control-label {
    width: 58px;
    flex-shrink: 0;
    font-family: var(--mono);
    font-size: 0.60rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    color: var(--text-2);
    text-transform: uppercase;
}

/* ── Double range slider ─────────────────────────────────────────────────────── */

.range-slider {
    flex: 1;
    position: relative;
    height: 20px;
}

.range-track {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border);
    transform: translateY(-50%);
    pointer-events: none;
}

.range-fill {
    position: absolute;
    height: 100%;
    background: var(--accent-dim);
}

.range-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    pointer-events: none;
    margin: 0;
    padding: 0;
}

.range-thumb::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 8px;
    height: 14px;
    background: var(--text-2);
    border: none;
    border-radius: 0;
    cursor: pointer;
    pointer-events: auto;
}

.range-thumb::-moz-range-thumb {
    width: 8px;
    height: 14px;
    background: var(--text-2);
    border: none;
    border-radius: 0;
    cursor: pointer;
    pointer-events: auto;
}

.range-readout {
    flex-shrink: 0;
    font-family: var(--mono);
    font-size: 0.60rem;
    letter-spacing: 0.04em;
    color: var(--text-2);
    min-width: 58px;
    text-align: right;
}

/* ── Axis min/max fields ─────────────────────────────────────────────────────── */

.axis-fields {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    min-width: 0;
}

.axis-input {
    width: 50px;
    padding: 5px 7px;
    font-size: 0.68rem;
}

.axis-sep {
    font-family: var(--mono);
    font-size: 0.62rem;
    color: var(--text-3);
}

/* ── Mouse latency config ─────────────────────────────────────────────────────── */

.config-block {
    padding: 16px 18px 18px;
    border-bottom: 1px solid var(--border);
}

.config-note {
    font-size: 0.72rem;
    font-weight: 300;
    color: var(--text-1);
    line-height: 1.55;
    letter-spacing: 0.01em;
    margin-bottom: 12px;
}

.config-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-mono {
    width: 68px;
    padding: 7px 9px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 0;
    color: var(--text-1);
    font-family: var(--mono);
    font-size: 0.76rem;
    letter-spacing: 0.04em;
}

.input-mono:focus {
    outline: none;
    border-color: var(--accent-dim);
}

.input-suffix {
    font-family: var(--mono);
    font-size: 0.64rem;
    letter-spacing: 0.08em;
    color: var(--text-3);
    flex-shrink: 0;
}

/* ═════════════════════════════════════════════════════════════════════════════════
   Metric groups & cards
   ═════════════════════════════════════════════════════════════════════════════════ */

.metric-group {
    border-bottom: 1px solid var(--border);
}

.group-label {
    padding: 14px 18px 8px;
    font-size: 0.58rem;
    font-weight: 500;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--text-1);
}

.group-label.foldable {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Thin 1px chevron built from two rotated borders — scales with the
   razor-thin typography. 4px square, rotated ±45°. */
.group-label .fold-arrow {
    display: inline-block;
    width: 5px;
    height: 5px;
    border: 0;
    border-right: 1px solid var(--text-3);
    border-bottom: 1px solid var(--text-3);
    transform: translateY(-1px) rotate(45deg);
    flex-shrink: 0;
}

.group-label.folded .fold-arrow {
    transform: translateX(-1px) rotate(-45deg);
}

.group-label .hw-name {
    margin-left: auto;
    font-size: 0.60rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    text-transform: none;
    color: var(--text-3);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

/* ── Metric card ──────────────────────────────────────────────────────────────── */

.metric-card {
    position: relative;
    padding: 8px 18px 8px 20px;
    border-top: 1px solid var(--border-sub);
}

.metric-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--c);
}

.metric-card.dimmed {
    opacity: 0.22;
}

/* ── Metric header ────────────────────────────────────────────────────────────── */

.metric-header {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    margin-bottom: 0;
}

.metric-header input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 9px;
    height: 9px;
    border: 1px solid var(--text-3);
    border-radius: 0;
    background: transparent;
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
}

.metric-header input[type="checkbox"]:checked {
    border-color: var(--c);
    background: var(--c);
}

.metric-name {
    flex: 1;
    min-width: 0;
    font-size: 0.72rem;
    font-weight: 300;
    color: var(--text-1);
    letter-spacing: 0.02em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.metric-unit {
    flex-shrink: 0;
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.06em;
    color: var(--text-2);
    font-weight: 400;
}

.metric-inline-input {
    width: 48px;
    padding: 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    font-family: var(--mono);
    font-size: 0.66rem;
    letter-spacing: 0.10em;
    color: var(--text-2);
    font-weight: 400;
    text-align: right;
    -moz-appearance: textfield;
}

.metric-inline-input::-webkit-outer-spin-button,
.metric-inline-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.metric-inline-input:focus {
    outline: none;
    border-bottom-color: var(--accent-dim);
    color: var(--text-1);
}


/* ═════════════════════════════════════════════════════════════════════════════════
   Compare View
   ═════════════════════════════════════════════════════════════════════════════════ */

.compare-view {
    flex: 1;
    min-height: 0;
    display: none;
    position: relative;
    overflow: hidden;
}

.compare-view.visible {
    display: block;
}

/* ── Compare sort control (sidebar) ──────────────────────────────────────────── */

.compare-sort {
    display: none;
    padding: 0 0 12px;
    border-bottom: 1px solid var(--border);
}

.compare-sort.visible {
    display: block;
}

.compare-sort-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 18px;
}

#compare-sort-metric {
    flex: 1;
    min-width: 0;
    padding: 7px 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 0;
    color: var(--text-1);
    font-family: var(--mono);
    font-size: 0.70rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
}

#compare-sort-metric:focus {
    outline: none;
    border-color: var(--accent-dim);
}

.btn-sort {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    background: transparent;
    color: var(--text-2);
    border: 1px solid var(--border);
    border-radius: 0;
    font-size: 0.65rem;
    line-height: 1;
    cursor: pointer;
    user-select: none;
}

.btn-sort:hover {
    color: var(--text-1);
    border-color: var(--text-3);
}


.compare-scroll {
    position: absolute;
    inset: 0;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.compare-scroll canvas {
    width: 100%;
    display: block;
}

#compare-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}