:root {
    --brand-primary: #6d4aff;
    --brand-hover: #8c6bff;
    --bg-dark: #0f0f23;
    --bg-secondary: #1a1a2e;
    --success: #41b472;
    --warning: #ffa500;
    --danger: #ff6969;
    --female-range-fill: rgba(255, 105, 180, 0.2);
    --female-range-border: #ff69b4;
    --male-range-fill: rgba(65, 105, 225, 0.2);
    --male-range-border: #4169e1;
    --nonbinary-range-fill: rgba(153, 102, 255, 0.2);
    --nonbinary-range-border: #9966ff;
    --silent-line-bg: #555;
    --silent-line-border: #555;
    --text-muted: #888;
    --text-subtle: #aaa;
    --border-subtle: #333;
    --white: #ffffff;
    --grey-subtle: #666;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: var(--white);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 900px;
    width: 95%;
    padding: 2rem;
}

h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--brand-primary);
    font-size: 2.5rem;
}

.controls {
    text-align: center;
    margin-bottom: 1.5rem;
}

button {
    background: var(--brand-primary);
    color: var(--white);
    border: none;
    padding: 12px 30px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: var(--brand-hover);
}

button:focus-visible {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
}

button:disabled {
    background: #444;
    cursor: not-allowed;
}

.main-display {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .main-display {
        flex-direction: column;
    }
}

.canvas-container {
    flex: 1;
    position: relative;
    background: var(--bg-dark);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(109, 74, 255, 0.3);
}

#frequencyCanvas {
width: 100%;
height: 400px;
display: block;
}

#waveformCanvas {
width: 100%;
height: 150px;
display: block;
margin-top: 10px;
}

.meter-container {
    width: 80px;
    background: var(--bg-dark);
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 4px 20px rgba(109, 74, 255, 0.3);
    display: flex;
    flex-direction: column;
}

.meter-header {
    text-align: center;
    margin-bottom: 15px;
}

.meter-title {
    font-size: 0.9rem;
    color: var(--text-subtle);
    margin-bottom: 5px;
}

.meter-target-value {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--brand-primary);
}

.meter-bar-wrapper {
    flex: 1;
    position: relative;
    background: var(--bg-secondary);
    border-radius: 6px;
    overflow: hidden;
    cursor: ns-resize;
}

.meter-bar-wrapper.dragging {
    cursor: grabbing;
    filter: brightness(1.1);
}

.meter-bar-bg {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
    background: linear-gradient(to top, var(--bg-secondary) 0%, #2a2a3e 100%);
}

.meter-bar-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, var(--success) 0%, var(--brand-primary) 50%, var(--danger) 100%);
    transition: height 0.05s ease;
}

.meter-target-zone {
    position: absolute;
    left: 0;
    right: 0;
    background: rgba(109, 74, 255, 0.3);
    border-top: 2px solid var(--brand-primary);
    border-bottom: 2px solid var(--brand-primary);
    pointer-events: auto;
    transition: background 0.15s ease;
}

.meter-target-zone:hover {
    background: rgba(109, 74, 255, 0.45);
}

.meter-current-indicator {
    position: absolute;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--white);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    z-index: 10;
}

.meter-readout {
    text-align: center;
    margin-top: 15px;
}

.meter-readout-value {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--success);
}

.meter-readout-value.low {
    color: var(--warning);
}

.meter-readout-value.high {
    color: var(--danger);
}

.meter-readout-value.on {
    color: var(--success);
}

.meter-status {
    text-align: center;
    font-size: 0.85rem;
    margin-top: 5px;
    color: var(--success);
}

.meter-status.off {
    color: var(--danger);
}

.drag-instruction {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-subtle);
    margin-top: 10px;
    font-style: italic;
}

.legend {
    display: flex;
    justify-content: space-around;
    margin-top: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-colour {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.female-range {
    background: var(--female-range-fill);
    border: 2px solid var(--female-range-border);
}

.male-range {
    background: var(--male-range-fill);
    border: 2px solid var(--male-range-border);
}

.nonbinary-range {
    background: var(--nonbinary-range-fill);
    border: 2px solid var(--nonbinary-range-border);
}

.voice-line {
    background: var(--brand-primary);
}

.silent-line {
    background: var(--silent-line-bg);
    border: 2px dashed var(--silent-line-border);
}

.target-zone {
    background: rgba(109, 74, 255, 0.3);
    border: 2px solid var(--brand-primary);
}

.info-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.stat-card {
    background: rgba(109, 74, 255, 0.15);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--brand-primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-subtle);
    margin-top: 0.3rem;
}

.quality-indicator {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-left: 8px;
}

.quality-good {
    background: var(--success);
    color: var(--white);
}

.quality-ok {
    background: var(--warning);
    color: var(--white);
}

.quality-poor {
    background: var(--danger);
    color: var(--white);
}

.status {
    text-align: center;
    margin: 1rem 0;
    padding: 0.5rem;
    border-radius: 6px;
    font-weight: normal;
}

.status.listening {
    background: rgba(65, 180, 114, 0.2);
    color: var(--success);
}

.status.stopped {
    background: rgba(255, 105, 105, 0.2);
    color: var(--danger);
}

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--brand-primary);
    color: var(--white);
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 1rem;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.debug-info {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    max-height: 200px;
    overflow-y: auto;
}

.debug-info.collapsed {
    display: none;
}

.debug-toggle {
    background: none;
    border: 1px solid #444;
    color: var(--text-subtle);
    padding: 6px 12px;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.debug-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.permission-help {
    display: none;
    text-align: center;
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(255, 105, 105, 0.1);
    border-radius: 8px;
    color: var(--danger);
    font-size: 0.9rem;
}

.permission-help.visible {
    display: block;
}

.permission-help a {
    color: var(--brand-primary);
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }

    .canvas-container {
        padding: 10px;
    }

    #frequencyCanvas {
    height: 300px;
    }
}