/* ── Design tokens ─────────────────────────────────── */
:root {
    --bg:        #08090d;
    --s1:        #0f1117;
    --s2:        #161920;
    --s3:        #1e2130;
    --border:    rgba(255,255,255,0.07);
    --border2:   rgba(255,255,255,0.12);
    --text:      #e8eaf2;
    --text2:     #8b91a8;
    --text3:     #555b72;
    --blue:      #3b82f6;
    --blue-d:    #1d4ed8;
    --green:     #10b981;
    --green-d:   rgba(16,185,129,0.15);
    --amber:     #f59e0b;
    --red:       #ef4444;
    --red-d:     rgba(239,68,68,0.15);
    --r:         14px;
    --r-sm:      8px;
    --r-xs:      6px;
    --shadow:    0 4px 24px rgba(0,0,0,0.5);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
    font-synthesis: none;
}

/* ── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100%;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ── Header ────────────────────────────────────────── */
header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.25rem;
    background: rgba(8,9,13,0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-left { display: flex; align-items: center; gap: 1rem; }
.header-right { display: flex; align-items: center; gap: 0.75rem; }

.logo {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

/* TX pill */
.tx-pill {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.2rem 0.7rem;
    font-size: 0.78rem;
    color: var(--text2);
}
.tx-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--text3);
    transition: background 0.3s;
}
.tx-dot.live {
    background: var(--green);
    box-shadow: 0 0 6px var(--green);
    animation: pulse-dot 2s ease-in-out infinite;
}
.tx-pkts { font-variant-numeric: tabular-nums; color: var(--text2); }

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* WS badge */
.ws-badge {
    font-size: 0.75rem;
    padding: 0.2em 0.7em;
    border-radius: 999px;
    font-weight: 500;
    background: var(--s2);
    border: 1px solid var(--border);
    color: var(--text3);
    transition: all 0.3s;
}
.ws-badge.connected {
    background: var(--green-d);
    border-color: rgba(16,185,129,0.3);
    color: var(--green);
}
.ws-badge.disconnected {
    background: var(--red-d);
    border-color: rgba(239,68,68,0.3);
    color: var(--red);
}

/* Guide link button */
.guide-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--s2);
    color: var(--text3);
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.15s;
    flex-shrink: 0;
}
.guide-link:hover { border-color: var(--border2); color: var(--text2); background: var(--s3); }

/* Icon button */
.icon-btn {
    background: var(--s2);
    border: 1px solid var(--border);
    color: var(--text2);
    width: 30px; height: 30px;
    border-radius: var(--r-xs);
    cursor: pointer;
    font-size: 1rem;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
    line-height: 1;
}
.icon-btn:hover { background: var(--s3); border-color: var(--border2); color: var(--text); }

/* ── Main / Grid ───────────────────────────────────── */
main {
    padding: 1.25rem;
    padding-bottom: 5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.rx-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

/* ── Receiver Card ─────────────────────────────────── */
.rx-card {
    background: var(--s1);
    border: 1px solid var(--border);
    border-radius: var(--r);
    overflow: hidden;
    transition: border-color 0.2s, box-shadow 0.2s;
    will-change: transform;
    animation: card-in 0.25s ease both;
}
.rx-card.live {
    border-color: rgba(16,185,129,0.25);
    box-shadow: 0 0 0 1px rgba(16,185,129,0.1), var(--shadow-sm);
}
.rx-card.muted-card {
    border-color: rgba(239,68,68,0.25);
}

@keyframes card-in {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Card header */
.rxc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1rem 0.75rem;
}
.rxc-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    min-width: 0;
}
.rxc-indicator {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    background: var(--text3);
    transition: background 0.3s, box-shadow 0.3s;
}
.rxc-indicator.live {
    background: var(--green);
    box-shadow: 0 0 8px rgba(16,185,129,0.6);
    animation: pulse-dot 2s ease-in-out infinite;
}
.rxc-name {
    font-weight: 600;
    font-size: 0.92rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.rxc-host {
    font-size: 0.72rem;
    color: var(--text3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
    max-width: 180px;
}
.rxc-actions { display: flex; align-items: center; gap: 0.4rem; flex-shrink: 0; }

/* Status badge on card */
.rxc-badge {
    font-size: 0.7rem;
    padding: 0.15em 0.55em;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.03em;
    border: 1px solid transparent;
}
.rxc-badge.live   { background: var(--green-d); border-color: rgba(16,185,129,0.3); color: var(--green); }
.rxc-badge.muted  { background: var(--red-d);   border-color: rgba(239,68,68,0.3);  color: var(--red); }
.rxc-badge.off    { background: var(--s2);       border-color: var(--border);        color: var(--text3); }

/* Buffer meter */
.rxc-meter {
    height: 3px;
    background: var(--s3);
    position: relative;
    overflow: hidden;
}
.rxc-meter-fill {
    height: 100%;
    width: 0%;
    transition: width 0.4s cubic-bezier(0.4,0,0.2,1);
    background: linear-gradient(90deg, var(--blue) 0%, var(--green) 60%, var(--amber) 85%, var(--red) 100%);
    background-size: 200% 100%;
}

/* Card body */
.rxc-body { padding: 0.75rem 1rem 1rem; }

/* Volume row */
.vol-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.75rem;
}
.vol-label-txt {
    font-size: 0.72rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    flex-shrink: 0;
    width: 2em;
}
.vol-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 3px;
    border-radius: 999px;
    background: var(--s3);
    cursor: pointer;
    outline: none;
    position: relative;
}
.vol-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--text);
    border: 2px solid var(--bg);
    box-shadow: 0 0 0 1px rgba(255,255,255,0.2), var(--shadow-sm);
    cursor: pointer;
    transition: transform 0.1s, background 0.1s;
}
.vol-slider::-webkit-slider-thumb:hover { transform: scale(1.2); background: white; }
.vol-slider::-webkit-slider-thumb:active { transform: scale(1.1); }

/* Make the slider track fill color dynamically via JS */
.vol-pct {
    font-size: 0.78rem;
    font-variant-numeric: tabular-nums;
    color: var(--text2);
    min-width: 3em;
    text-align: right;
    flex-shrink: 0;
}

/* Card footer */
.rxc-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}
.rxc-stats {
    display: flex;
    gap: 0.9rem;
    font-size: 0.72rem;
    color: var(--text3);
    font-variant-numeric: tabular-nums;
}
.rxc-stat-val { color: var(--text2); font-weight: 500; }
.rxc-stat-val.err { color: var(--amber); }

/* Mute button */
.btn-mute {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35em 0.85em;
    border-radius: var(--r-xs);
    border: 1px solid var(--border2);
    background: var(--s2);
    color: var(--text2);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    flex-shrink: 0;
}
.btn-mute:hover { background: var(--s3); color: var(--text); }
.btn-mute.muted {
    background: var(--red-d);
    border-color: rgba(239,68,68,0.35);
    color: var(--red);
}

/* Remove button */
.btn-remove {
    background: none;
    border: none;
    color: var(--text3);
    width: 24px; height: 24px;
    border-radius: var(--r-xs);
    cursor: pointer;
    font-size: 0.8rem;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
}
.btn-remove:hover { background: var(--red-d); color: var(--red); }

/* ── Empty state ───────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text3);
    line-height: 2;
}
.empty-state strong { color: var(--text2); }

/* ── Bottom nav ────────────────────────────────────── */
.bottom-nav {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    display: flex;
    background: rgba(8,9,13,0.92);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    z-index: 10;
}
.bnav {
    flex: 1;
    background: none;
    border: none;
    color: var(--text3);
    padding: 0.7rem;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s;
    border-top: 2px solid transparent;
}
.bnav:hover { color: var(--text2); }
.bnav.active { color: var(--blue); border-top-color: var(--blue); }

/* ── Panel overlays ────────────────────────────────── */
.panel-overlay {
    position: fixed;
    inset: 0;
    z-index: 20;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    animation: slide-up 0.2s ease both;
}
.panel-overlay.hidden { display: none; }
@keyframes slide-up {
    from { transform: translateY(20px); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}
.panel-header h2 { font-size: 1rem; font-weight: 600; }
.panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 1.25rem;
    padding-bottom: 5rem;
}

/* ── Routing ───────────────────────────────────────── */
.route-add-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
input {
    background: var(--s2);
    border: 1px solid var(--border2);
    color: var(--text);
    padding: 0.45em 0.75em;
    border-radius: var(--r-xs);
    font-size: 0.84rem;
    outline: none;
    transition: border-color 0.15s;
}
input:focus { border-color: var(--blue); }
.btn {
    background: var(--blue);
    color: #fff;
    border: none;
    padding: 0.45em 1em;
    border-radius: var(--r-xs);
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-sm { padding: 0.3em 0.65em; font-size: 0.75rem; }
.btn-danger { background: var(--red); }

table { width: 100%; border-collapse: collapse; font-size: 0.84rem; }
th, td { text-align: left; padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--border); }
th { color: var(--text3); font-weight: 500; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }

/* ── Stats ─────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.75rem;
}
.stat-card {
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 1rem;
    text-align: center;
}
.stat-label { font-size: 0.72rem; color: var(--text3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.4rem; }
.stat-val { font-size: 1.4rem; font-weight: 700; color: var(--blue); font-variant-numeric: tabular-nums; }

/* ── Buffer selector ───────────────────────────────── */
.buf-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.75rem;
}
.buf-label-txt {
    font-size: 0.72rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    flex-shrink: 0;
    width: 3em;
}
.buf-sel {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    background: var(--s2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23555b72'/%3E%3C/svg%3E") no-repeat right 0.55rem center;
    border: 1px solid var(--border2);
    color: var(--text);
    padding: 0.3em 1.6em 0.3em 0.6em;
    border-radius: var(--r-xs);
    font-size: 0.78rem;
    outline: none;
    cursor: pointer;
    transition: border-color 0.15s;
}
.buf-sel:focus { border-color: var(--blue); }
.buf-sel:hover { border-color: var(--border2); background-color: var(--s3); }

/* ── Monitor card ──────────────────────────────────── */
.mon-card {
    background: var(--s1);
    border: 1px solid var(--border);
    border-radius: var(--r);
    overflow: hidden;
    margin-bottom: 1rem;
    animation: card-in 0.25s ease both;
}
.mon-card.running {
    border-color: rgba(59,130,246,0.35);
    box-shadow: 0 0 0 1px rgba(59,130,246,0.12), var(--shadow-sm);
}
.mon-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1rem 0.75rem;
}
.mon-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font-weight: 600;
    font-size: 0.92rem;
}
.mon-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--text3);
    transition: background 0.3s, box-shadow 0.3s;
}
.mon-dot.running {
    background: var(--blue);
    box-shadow: 0 0 8px rgba(59,130,246,0.6);
    animation: pulse-dot 2s ease-in-out infinite;
}
.mon-actions { display: flex; align-items: center; gap: 0.4rem; }
.mon-badge {
    font-size: 0.7rem;
    padding: 0.15em 0.55em;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.03em;
    border: 1px solid transparent;
    background: var(--s2);
    border-color: var(--border);
    color: var(--text3);
}
.mon-badge.running {
    background: rgba(59,130,246,0.15);
    border-color: rgba(59,130,246,0.3);
    color: var(--blue);
}
.mon-body { padding: 0 1rem 1rem; }
.mon-dev-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}
.mon-dev-sel {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    background: var(--s2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23555b72'/%3E%3C/svg%3E") no-repeat right 0.55rem center;
    border: 1px solid var(--border2);
    color: var(--text);
    padding: 0.3em 1.6em 0.3em 0.6em;
    border-radius: var(--r-xs);
    font-size: 0.78rem;
    outline: none;
    cursor: pointer;
    transition: border-color 0.15s;
    min-width: 0;
}
.mon-dev-sel:focus { border-color: var(--blue); }
.mon-start-btn {
    padding: 0.35em 0.9em;
    border-radius: var(--r-xs);
    border: 1px solid var(--border2);
    background: var(--s2);
    color: var(--text2);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    flex-shrink: 0;
}
.mon-start-btn:hover { background: var(--s3); color: var(--text); }
.mon-start-btn.running {
    background: var(--red-d);
    border-color: rgba(239,68,68,0.35);
    color: var(--red);
}

/* ── Delay comparison bar ──────────────────────────── */
.delay-bar-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.5rem;
}
.delay-bar-wrap {
    flex: 1;
    height: 4px;
    background: var(--s3);
    border-radius: 999px;
    overflow: hidden;
}
.delay-bar-fill {
    height: 100%;
    background: var(--amber);
    border-radius: 999px;
    transition: width 0.4s cubic-bezier(0.4,0,0.2,1);
    width: 0%;
}

/* ── Packet-loss sparkline ─────────────────────────── */
.loss-sparkline {
    width: 100%;
    height: 28px;
    margin-bottom: 0.4rem;
    overflow: hidden;
}
.loss-sparkline:empty { display: none; }

/* ── Browser Audio ──────────────────────────────────── */
.browser-audio-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
}
.ba-hero {
    display: flex;
    align-items: center;
    gap: 18px;
}
.ba-play-btn {
    width: 68px;
    height: 68px;
    border-radius: 50%;
    border: 2px solid var(--border2);
    background: var(--s2);
    color: var(--text);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.ba-play-btn:hover { background: var(--s3); border-color: var(--blue); }
.ba-play-btn.ba-playing {
    background: rgba(16,185,129,0.15);
    border-color: var(--green);
    box-shadow: 0 0 20px rgba(16,185,129,0.25);
    animation: ba-pulse 2s ease-in-out infinite;
}
@keyframes ba-pulse {
    0%, 100% { box-shadow: 0 0 14px rgba(16,185,129,0.2); }
    50%       { box-shadow: 0 0 28px rgba(16,185,129,0.5); }
}
.ba-status { display: flex; flex-direction: column; gap: 4px; }
#ba-label  { font-size: 15px; font-weight: 600; color: var(--text); }
.ba-fmt    { font-size: 12px; color: var(--text3); }

/* VU meter / Spectrum viz row */
.ba-viz-row {
    display: flex;
    align-items: center;
    gap: 10px;
}
.ba-viz-row .ba-vu { flex: 1; }
.ba-viz-btn {
    flex-shrink: 0;
    padding: 4px 10px;
    background: var(--s3);
    border: 1px solid var(--border2);
    border-radius: var(--r-xs);
    color: var(--text2);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.04em;
    transition: background 0.15s, color 0.15s;
}
.ba-viz-btn:hover { background: var(--s2); color: var(--text); }

/* VU meter canvas */
.ba-vu {
    width: 100%;
    height: 44px;
    border-radius: 4px;
    display: block;
}

/* Controls */
.ba-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 14px 16px;
}
.ba-ctrl-row {
    display: flex;
    align-items: center;
    gap: 10px;
}
.ba-ctrl-label {
    font-size: 12px;
    color: var(--text2);
    width: 48px;
    flex-shrink: 0;
}
.ba-slider {
    flex: 1;
    accent-color: var(--green);
    height: 4px;
    cursor: pointer;
}
.ba-mono {
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    color: var(--text);
    min-width: 44px;
    text-align: right;
}

/* Hint */
.ba-hint {
    font-size: 12px;
    color: var(--text3);
    line-height: 1.6;
}
.ba-hint code {
    background: var(--s3);
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 11px;
    color: var(--text2);
}

/* ── Toggle switch ─────────────────────────────────── */
.toggle {
    position: relative;
    width: 36px; height: 20px;
    flex-shrink: 0;
    cursor: pointer;
}
.toggle input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-track {
    position: absolute; inset: 0;
    background: var(--s3);
    border: 1px solid var(--border2);
    border-radius: 999px;
    transition: background 0.2s, border-color 0.2s;
}
.toggle-track::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 14px; height: 14px;
    background: var(--text3);
    border-radius: 50%;
    transition: transform 0.2s, background 0.2s;
}
.toggle input:checked + .toggle-track {
    background: rgba(59,130,246,0.25);
    border-color: rgba(59,130,246,0.5);
}
.toggle input:checked + .toggle-track::after {
    transform: translateX(16px);
    background: var(--blue);
}
.toggle.green input:checked + .toggle-track {
    background: var(--green-d);
    border-color: rgba(16,185,129,0.4);
}
.toggle.green input:checked + .toggle-track::after {
    background: var(--green);
}

/* ── Preset buttons ────────────────────────────────── */
.preset-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    padding: 0.6rem 0.4rem;
    background: var(--s2);
    border: 1px solid var(--border2);
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text2);
}
.preset-btn:hover {
    background: var(--s3);
    border-color: rgba(59,130,246,0.3);
    color: var(--text);
}
.preset-btn.active {
    background: rgba(59,130,246,0.12);
    border-color: rgba(59,130,246,0.5);
    color: var(--blue);
    box-shadow: 0 0 12px rgba(59,130,246,0.15);
}
.preset-icon {
    font-size: 1.1rem;
    line-height: 1;
}
.preset-name {
    font-size: 0.75rem;
    font-weight: 600;
}
.preset-desc {
    font-size: 0.6rem;
    color: var(--text3);
    text-align: center;
    line-height: 1.2;
}
.preset-btn.active .preset-desc { color: rgba(59,130,246,0.7); }

/* ── Tune card ─────────────────────────────────────── */
.tune-section {
    border-top: 1px solid var(--border);
    padding-top: 0.65rem;
    margin-top: 0.5rem;
}
.tune-section-hdr {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    margin-bottom: 0.45rem;
}
.tune-section-hdr .sec-title {
    font-weight: 600;
    font-size: 0.78rem;
    color: var(--text2);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.tune-section-hdr .sec-arrow {
    font-size: 0.65rem;
    color: var(--text3);
    transition: transform 0.2s;
}
.tune-section-hdr.open .sec-arrow { transform: rotate(90deg); }
.tune-section-body {
    display: none;
    padding-bottom: 0.2rem;
}
.tune-section-body.open { display: block; }

.tune-toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.35rem 0;
}
.tune-toggle-label {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text);
}
.tune-toggle-desc {
    font-size: 0.68rem;
    color: var(--text3);
    margin-top: 0.1rem;
}

/* RMS meter */
.rms-meter {
    height: 4px;
    background: var(--s3);
    border-radius: 999px;
    overflow: hidden;
    margin: 0.4rem 0;
}
.rms-meter-fill {
    height: 100%;
    border-radius: 999px;
    transition: width 0.3s ease, background 0.3s;
    width: 0%;
}

/* Tune metrics grid */
.tune-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin: 0.5rem 0;
}
.tune-stat {
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 0.5rem 0.6rem;
    text-align: center;
}
.tune-stat-label {
    font-size: 0.62rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.tune-stat-val {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}
.tune-stat-val.warn { color: var(--amber); }
.tune-stat-val.ok   { color: var(--green); }

/* Latency breakdown */
.lat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.25rem 1rem;
    font-size: 0.73rem;
    color: var(--text3);
}
.lat-grid .lat-val { color: var(--text2); font-variant-numeric: tabular-nums; }
.lat-total {
    margin-top: 0.3rem;
    font-size: 0.78rem;
    color: var(--text2);
    font-weight: 500;
}

/* Slider row for tune */
.tune-slider-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
}
.tune-slider-row .sl-label {
    font-size: 0.7rem;
    color: var(--text3);
    width: 5.5em;
    flex-shrink: 0;
    text-align: right;
}
.tune-slider-row .sl-val {
    font-size: 0.73rem;
    color: var(--text2);
    min-width: 3.5em;
    text-align: right;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* Reset link */
.tune-reset-link {
    background: none;
    border: none;
    color: var(--text3);
    font-size: 0.7rem;
    cursor: pointer;
    text-decoration: underline;
    text-decoration-style: dotted;
    transition: color 0.15s;
}
.tune-reset-link:hover { color: var(--text2); }

/* ── Audio Controls card ───────────────────────────── */
.audio-ctrl-card {
    margin-top: 1.25rem;
    background: var(--s1);
    border: 1px solid var(--border);
    border-radius: var(--r);
    padding: 1rem 1.25rem;
}
.ac-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}
.ac-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.ac-expand-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text3);
    width: 26px; height: 26px;
    border-radius: var(--r-xs);
    cursor: pointer;
    font-size: 0.85rem;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
}
.ac-expand-btn:hover { background: var(--s3); color: var(--text2); }

.ac-toggles {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 1.25rem;
}

/* Toggle switch */
.ac-toggle {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    cursor: pointer;
    user-select: none;
}
.ac-toggle input { display: none; }
.ac-sw {
    position: relative;
    width: 32px; height: 18px;
    background: var(--s3);
    border-radius: 999px;
    border: 1px solid var(--border);
    transition: all 0.2s;
    flex-shrink: 0;
}
.ac-sw::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 12px; height: 12px;
    background: var(--text3);
    border-radius: 50%;
    transition: all 0.2s;
}
.ac-toggle input:checked + .ac-sw {
    background: var(--green-d);
    border-color: rgba(16,185,129,0.4);
}
.ac-toggle input:checked + .ac-sw::after {
    left: 16px;
    background: var(--green);
}
.ac-lbl {
    font-size: 0.78rem;
    color: var(--text2);
    font-weight: 500;
}

/* Settings detail */
.ac-detail {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}
.ac-detail-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.5rem;
}
.ac-detail-label {
    font-size: 0.72rem;
    color: var(--text3);
    min-width: 70px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.ac-slider {
    flex: 1;
    accent-color: var(--blue);
    height: 4px;
}
.ac-detail-val {
    font-size: 0.78rem;
    color: var(--text2);
    min-width: 40px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}
.ac-mono {
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.82rem;
    color: var(--blue);
    font-weight: 600;
}

/* ── Music Player ──────────────────────────────────── */
.mp-now-playing {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--s2);
    border: 1px solid var(--border);
    border-radius: var(--r);
    margin-bottom: 1rem;
}

.mp-art {
    width: 72px;
    height: 72px;
    border-radius: var(--r-sm);
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.mp-art-placeholder {
    background: linear-gradient(135deg, #1a1d2e 0%, var(--s3) 100%);
}

.mp-art-placeholder::after {
    content: '♫';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--text3);
}

.mp-track-meta {
    flex: 1;
    min-width: 0;
}

.mp-np-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.15rem;
}

.mp-np-artist {
    font-size: 0.8rem;
    color: var(--text2);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mp-np-fmt {
    font-size: 0.68rem;
    color: var(--text3);
    margin-top: 0.2rem;
    font-family: "SF Mono", "Fira Code", monospace;
    letter-spacing: 0.02em;
}

.mp-spectrum {
    width: 100%;
    height: 72px;
    border-radius: var(--r-sm);
    background: var(--s1);
    display: block;
    margin-bottom: 0.85rem;
}

.mp-seek-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1rem;
}

.mp-time {
    font-size: 0.7rem;
    font-variant-numeric: tabular-nums;
    color: var(--text3);
    min-width: 2.8em;
    font-family: "SF Mono", "Fira Code", monospace;
}

.mp-seek-bar {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--s3);
    border-radius: 999px;
    cursor: pointer;
    outline: none;
}

.mp-seek-bar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--blue);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 6px rgba(59,130,246,0.5);
    transition: transform 0.15s;
}

.mp-seek-bar::-webkit-slider-thumb:hover { transform: scale(1.2); }

.mp-transport {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    margin-bottom: 0.9rem;
}

.mp-ctrl-btn {
    background: var(--s2);
    border: 1px solid var(--border);
    color: var(--text2);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

.mp-ctrl-btn.mp-ctrl-lg {
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
}

.mp-ctrl-btn:hover { background: var(--s3); color: var(--text); }
.mp-ctrl-btn.active { color: var(--blue); border-color: rgba(59,130,246,0.5); background: rgba(59,130,246,0.08); }

.mp-play-btn {
    background: var(--blue);
    border: none;
    color: #fff;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    box-shadow: 0 4px 18px rgba(59,130,246,0.45);
    flex-shrink: 0;
}

.mp-play-btn:hover {
    background: #2563eb;
    transform: scale(1.06);
    box-shadow: 0 6px 24px rgba(59,130,246,0.6);
}

.mp-play-btn:active { transform: scale(0.97); }

.mp-vol-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.mp-vol-icon {
    font-size: 0.9rem;
    width: 1.2em;
    text-align: center;
    color: var(--text3);
}

.mp-vol-bar {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--s3);
    border-radius: 999px;
    cursor: pointer;
    outline: none;
}

.mp-vol-bar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--text2);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.15s;
}

.mp-vol-bar::-webkit-slider-thumb:hover { background: var(--text); }

.mp-drop-zone {
    border: 2px dashed var(--border2);
    border-radius: var(--r);
    padding: 1.5rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.15s;
    margin-bottom: 1rem;
}

.mp-drop-zone:hover,
.mp-drop-zone.drag-over {
    border-color: var(--blue);
    background: rgba(59,130,246,0.05);
}

.mp-drop-zone.drag-over .mp-drop-icon { transform: scale(1.15); }
.mp-drop-zone.loading { opacity: 0.5; pointer-events: none; }

.mp-drop-icon {
    font-size: 2rem;
    color: var(--text3);
    margin-bottom: 0.4rem;
    transition: transform 0.2s;
    line-height: 1;
}

.mp-drop-text {
    font-size: 0.83rem;
    color: var(--text2);
    margin-bottom: 0.25rem;
}

.mp-drop-formats {
    font-size: 0.68rem;
    color: var(--text3);
    letter-spacing: 0.03em;
}

.mp-playlist-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0 0.25rem;
}

.mp-playlist-count {
    font-size: 0.72rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}

.mp-clear-btn {
    background: none;
    border: none;
    color: var(--text3);
    font-size: 0.72rem;
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    border-radius: var(--r-xs);
    transition: all 0.1s;
}

.mp-clear-btn:hover { color: var(--red); background: var(--red-d); }

.mp-playlist {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-bottom: 1rem;
}

.mp-track {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.7rem;
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: background 0.1s;
    border: 1px solid transparent;
}

.mp-track:hover { background: var(--s2); }

.mp-track.active {
    background: rgba(59,130,246,0.1);
    border-color: rgba(59,130,246,0.2);
}

.mp-track-num {
    font-size: 0.68rem;
    color: var(--text3);
    min-width: 1.6em;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-family: "SF Mono", monospace;
    flex-shrink: 0;
}

.mp-track.active .mp-track-num { color: var(--blue); }
.mp-track.active .mp-track-num::before { content: '▶ '; }
.mp-track.active .mp-track-num .mp-num-txt { display: none; }

.mp-track-thumb {
    width: 36px;
    height: 36px;
    border-radius: 4px;
    background-size: cover;
    background-position: center;
    background-color: var(--s3);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.mp-track-thumb.no-art::after {
    content: '♫';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    color: var(--text3);
}

.mp-track-info { flex: 1; min-width: 0; }

.mp-track-title {
    font-size: 0.8rem;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mp-track.active .mp-track-title { color: var(--blue); font-weight: 500; }

.mp-track-artist {
    font-size: 0.68rem;
    color: var(--text3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mp-track-dur {
    font-size: 0.68rem;
    color: var(--text3);
    font-variant-numeric: tabular-nums;
    font-family: "SF Mono", monospace;
    flex-shrink: 0;
}

.mp-track-remove {
    background: none;
    border: none;
    color: var(--text3);
    cursor: pointer;
    font-size: 0.65rem;
    padding: 3px 5px;
    border-radius: 3px;
    opacity: 0;
    transition: all 0.1s;
    flex-shrink: 0;
}

.mp-track:hover .mp-track-remove { opacity: 1; }
.mp-track-remove:hover { color: var(--red); background: var(--red-d); }

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 600px) {
    .rx-grid { grid-template-columns: 1fr; }
    .txc-pkts { display: none; }
    .tune-stats { grid-template-columns: repeat(2, 1fr); }
    .ac-toggles { gap: 0.5rem 0.75rem; }
}