/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   signal.css  —  SIGNAL VIEWER OVERLAY
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

#signalOverlay {
    position: fixed;
    inset: 0;
    z-index: 650;
    display: flex;
    flex-direction: column;
    background: rgba(245, 242, 236, 0.88);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    font-family: 'Space Mono', monospace;
}

#signalOverlay.visible {
    opacity: 1;
    pointer-events: all;
}

/* ── Header ───────────────────────────────────────────────────── */

.sig-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 36px;
    height: 52px;
    border-bottom: 1px solid var(--border2);
    flex-shrink: 0;
}

.sig-header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.sig-label {
    font-size: 0.52rem;
    letter-spacing: 0.45em;
    color: var(--muted);
    text-transform: uppercase;
}

.sig-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--red);

    flex-shrink: 0;
}



.sig-status {
    font-size: 0.45rem;
    letter-spacing: 0.3em;
    color: var(--muted2);
    text-transform: uppercase;
    transition: color 0.3s;
}

.sig-status.active { color: var(--ink); }

.sig-close-btn {
    background: transparent;
    border: none;
    color: var(--muted);
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    cursor: pointer;
    padding: 2px 6px;
    transition: color 0.15s;
    line-height: 1;
}

.sig-close-btn:hover { color: var(--ink); }

/* ── Body ─────────────────────────────────────────────────────── */

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

/* ── Sidebar ──────────────────────────────────────────────────── */

.sig-sidebar {
    width: 200px;
    flex-shrink: 0;
    border-right: 1px solid var(--border2);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--muted2) transparent;
}

.sig-section {
    padding: 18px 20px 14px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sig-section-label {
    font-size: 0.38rem;
    letter-spacing: 0.35em;
    color: var(--muted);
    text-transform: uppercase;
}

.sig-range-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sig-range {
    flex: 1;
    height: 2px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(26, 26, 24, 0.12);
    border-radius: 1px;
    outline: none;
    cursor: pointer;
}

.sig-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--ink);
    cursor: pointer;
}

.sig-range::-moz-range-thumb {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--ink);
    border: none; cursor: pointer;
}

.sig-range-val {
    font-size: 0.36rem;
    letter-spacing: 0.08em;
    color: var(--muted2);
    width: 36px;
    text-align: right;
    flex-shrink: 0;
}

.sig-colormap-options {
    display: flex;
    gap: 5px;
}

.sig-cm-btn {
    flex: 1;
    background: transparent;
    border: 1px solid var(--border2);
    border-radius: 2px;
    font-family: 'Space Mono', monospace;
    font-size: 0.34rem;
    letter-spacing: 0.18em;
    color: var(--muted2);
    cursor: pointer;
    padding: 5px 0;
    text-transform: uppercase;
    transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.sig-cm-btn:hover  { color: var(--muted); border-color: var(--muted); }
.sig-cm-btn.active { color: var(--ink); border-color: var(--ink); background: rgba(26,26,24,0.05); }

.sig-btn {
    background: transparent;
    border: 1px solid var(--border2);
    border-radius: 2px;
    font-family: 'Space Mono', monospace;
    font-size: 0.38rem;
    letter-spacing: 0.22em;
    color: var(--muted);
    cursor: pointer;
    padding: 7px 12px;
    text-transform: uppercase;
    transition: color 0.15s, border-color 0.15s;
    text-align: left;
    width: 100%;
}

.sig-btn:hover  { color: var(--ink); border-color: var(--muted); }
.sig-btn.active { color: var(--ink); border-color: var(--ink); }

.sig-meta {
    margin-top: auto;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.sig-meta-row {
    display: flex;
    justify-content: space-between;
}

.sig-meta-label {
    font-size: 0.36rem;
    letter-spacing: 0.2em;
    color: var(--muted2);
    text-transform: uppercase;
}

.sig-meta-val {
    font-size: 0.36rem;
    letter-spacing: 0.1em;
    color: var(--muted);
}

/* ── Canvas wrap ──────────────────────────────────────────────── */

.sig-canvas-wrap {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--cream);
}

#sigCanvas {
    position: absolute;
    top: 0; left: 0;
    display: block;
}

.sig-idle {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

.sig-idle.hidden { opacity: 0; }

.sig-idle-text {
    font-size: 0.52rem;
    letter-spacing: 0.35em;
    color: var(--muted2);
    text-transform: uppercase;
}

.sig-idle-sub {
    font-size: 0.38rem;
    letter-spacing: 0.22em;
    color: rgba(26, 26, 24, 0.2);
    text-transform: uppercase;
}

.sig-freq-axis {
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: 52px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 6px 8px;
    border-left: 1px solid var(--border);
    pointer-events: none;
}

.sig-freq-label {
    font-size: 0.32rem;
    letter-spacing: 0.1em;
    color: var(--muted2);
    text-align: right;
    line-height: 1;
}

.sig-cursor {
    position: absolute;
    top: 0; bottom: 0;
    width: 1px;
    background: rgba(232, 55, 42, 0.5);
    pointer-events: none;
    display: none;
}

/* ── Footer ───────────────────────────────────────────────────── */

.sig-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 36px 0 220px;
    height: 38px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.sig-footer-note {
    font-size: 0.36rem;
    letter-spacing: 0.16em;
    color: var(--muted2);
    text-transform: uppercase;
}

.sig-footer-time {
    font-size: 0.4rem;
    letter-spacing: 0.12em;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

/* ── Signal button — bottom centre of globe screen ────────────── */

#signalBtn {
    position: fixed;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Space Mono', monospace;
    font-size: 0.48rem;
    letter-spacing: 0.35em;
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 1.4s ease, color 0.15s;
    z-index: 400;
    text-transform: uppercase;
    padding: 8px 0;
}

#signalBtn.visible { opacity: 1; pointer-events: all; }
#signalBtn:hover   { color: var(--ink); }