.reference-popup {
    position: fixed;
    z-index: 1000;
    pointer-events: none;
    transition: opacity 0.15s;
}

.reference-popup.hidden  { opacity: 0; }
.reference-popup.visible { opacity: 1; }

.popup-content {
    background: var(--dark);
    color: var(--white);
    padding: 0.9rem 1.1rem;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
    min-width: 260px;
    max-width: 380px;
    border-top: 2px solid var(--accent);
}

.popup-content h4 {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: normal;
    margin-bottom: 0.65rem;
    padding-bottom: 0.45rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--accent);
}

.popup-grid {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.popup-row {
    display: flex;
    gap: 0.75rem;
    font-size: 0.8rem;
    font-family: var(--font-mono);
}

.popup-label {
    color: rgba(255, 255, 255, 0.45);
    min-width: 130px;
    flex-shrink: 0;
}

.popup-comment {
    margin-top: 0.45rem;
    padding-top: 0.45rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.popup-comment .popup-value {
    font-family: var(--font);
    font-size: 0.78rem;
    line-height: 1.4;
}

.graph-section {
    padding: 2rem 0;
    background: var(--bg);
    min-height: 520px;
}

.graph-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 0.5rem;
}

.graph-container {
    background: var(--white);
    border: 1px solid var(--border);
    position: relative;
    height: 500px;
    padding: 1.25rem 1rem 0.75rem;
}

.graph-empty {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-light);
    pointer-events: none;
}

.graph-empty.hidden { display: none; }

#graph-canvas         { display: none; width: 100% !important; height: 100% !important; }
#graph-canvas.visible { display: block; }

.time-range-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.control-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    white-space: nowrap;
}

.time-range-btns {
    display: flex;
    gap: 1.25rem;
    align-items: center;
}

.time-btn {
    background: none;
    border: none;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.time-btn input[type="radio"] { display: none; }

.time-btn:hover { color: var(--accent); }

.time-btn.active { color: var(--accent); }

.time-btn-n input[type="number"] {
    width: 2rem;
    border: none;
    border-bottom: 1px solid var(--border);
    background: transparent;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    text-align: center;
    color: inherit;
    padding: 0;
    -moz-appearance: textfield;
    outline: none;
}

.time-btn-n input[type="number"]::-webkit-inner-spin-button,
.time-btn-n input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.param-rows {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.param-row {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.param-row-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    width: 5.5rem;
    flex-shrink: 0;
}

.view-toggle {
    display: flex;
    gap: 1rem;
    margin-left: 0.5rem;
}

.view-option {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    user-select: none;
}

.view-option input[type="radio"] { cursor: pointer; }

.view-option:has(input:checked) { color: var(--accent); }

.param-group-header {
    padding: 0.3rem 0.6rem 0.3rem 0.85rem;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    background: #fafafa;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.param-group-header:first-of-type { border-top: none; }

.param-select-all-btn {
    background: transparent;
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    padding: 0.1rem 0.45rem;
    cursor: pointer;
    text-transform: lowercase;
    letter-spacing: 0.03em;
    line-height: 1.4;
}

.param-select-all-btn:hover {
    border-color: var(--dark);
    color: var(--text);
}