:root {
    --bg: #0b0f14;
    --panel: #0f1720;
    --accent: #2dd4bf;
    --muted: #7f98b0;
    color-scheme: dark;
}

html, body {
    height: 100%;
    margin: 0;
    font-family: Inter, system-ui, "Segoe UI", Roboto, Arial;
}

body {
    background: linear-gradient(180deg, #071018, #071018 60%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
}

.app {
    width: 100%;
    max-width: 1100px;
    background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
    border-radius: 12px;
    padding: 14px;
    box-shadow: 0 6px 30px rgba(2,6,23,0.6);
}

header {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 10px;
}

h1 {
    font-size: 18px;
    margin: 0;
    color: #e6eef6;
}

.controls {
    margin-left: auto;
    display: flex;
    gap: 8px;
    align-items: center;
}

button, input, select {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.06);
    color: #dbeafe;
    padding: 8px 10px;
    border-radius: 8px;
}

.primary {
    border-color: var(--accent);
    box-shadow: 0 2px 10px rgba(45,212,191,0.06);
}

canvas {
    width: 100%;
    height: 360px;
    background: black;
    border-radius: 8px;
    display: block;
}

label {
    color: #9fb0c8;
    font-size: 13px;
}

.row {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 10px;
}

.grow {
    flex: 1;
}

.small {
    font-size: 13px;
    color: #9fb0c8;
}

footer {
    margin-top: 8px;
    color: var(--muted);
    font-size: 12px;
}

option {
    background-color: #0f1720;
    color: #e6eef6;
}

.panel {
    background: var(--panel);
    padding: 14px;
    border-radius: 10px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.25);
}

.panel h2 {
    margin: 0;
    font-size: 15px;
    color: #c5d2e1;
}

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

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 999px;
    background: rgba(255,255,255,0.02);
    font-size: 12px;
    color: #cfeff0;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #444;
    box-shadow: 0 0 4px rgba(0,0,0,0.6) inset;
}

.dot.active {
    background: #2dd4bf;
    box-shadow: 0 0 8px rgba(45,212,191,0.6);
}

.muted {
    opacity: 0.6;
}

.control-group {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.file-name {
    font-size: 12px;
    color: #cfeff0;
    opacity: 0.9;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 180px;
}

.toggle-btn {
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
}

.toggle-btn.active {
    border-color: var(--accent);
    box-shadow: 0 2px 12px rgba(45,212,191,0.08);
}

.controls .small {
    color: var(--muted);
}

.status-line {
    display:flex;
    gap:10px;
    align-items:center;
    justify-content:space-between;
    margin-top:10px;
}

.status-area {
    font-size:13px;
    color:#cfeff0;
    display:flex;
    gap:10px;
    align-items:center;
}

.freq-readout {
    font-size:13px;
    color:#cfeff0;
    min-width:48px;
    text-align:right;
}

.center {
    display:flex;
    align-items:center;
    justify-content:center;
}