:root {
            color-scheme: dark light;
        }

        body {
            margin: 0;
            font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
            background: #0b0c10;
            color: #e5e7eb;
        }

        header {
            padding: 20px;
            border-bottom: 1px solid #1f2937;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
        }

        .controls {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 16px;
            align-items: center;
        }

        button {
            padding: 10px 14px;
            border-radius: 12px;
            border: 1px solid #374151;
            background: #111827;
            color: #e5e7eb;
            cursor: pointer;
        }

        button:hover {
            background: #0f172a;
        }

        button.danger {
            background: rgba(239, 68, 68, 0.15);
            color: #fca5a5;
            border-color: rgba(239, 68, 68, 0.3);
        }

        button.danger:hover {
            background: rgba(239, 68, 68, 0.25);
        }

        .voice-selector {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .voice-selector label {
            font-size: 14px;
            color: #9ca3af;
        }

        .voice-selector select {
            padding: 8px 12px;
            border-radius: 8px;
            border: 1px solid #374151;
            background: #111827;
            color: #e5e7eb;
            cursor: pointer;
            font-size: 14px;
        }

        .voice-selector select:hover {
            background: #0f172a;
        }

        .voice-selector select:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

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

        .speed-control label {
            font-size: 14px;
            color: #9ca3af;
        }

        .speed-control select {
            padding: 8px 12px;
            border-radius: 8px;
            border: 1px solid #374151;
            background: #111827;
            color: #e5e7eb;
            cursor: pointer;
            font-size: 14px;
        }

        .speed-control select:hover {
            background: #0f172a;
        }

        .speed-control select:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .model-selector {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .model-selector label {
            font-size: 14px;
            color: #9ca3af;
        }

        .model-selector select {
            padding: 8px 12px;
            border-radius: 8px;
            border: 1px solid #374151;
            background: #111827;
            color: #e5e7eb;
            cursor: pointer;
            font-size: 14px;
        }

        .model-selector select:hover {
            background: #0f172a;
        }

        .model-selector select:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .upload-btn {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .upload-btn button {
            padding: 8px 12px;
            border-radius: 8px;
            border: 1px solid #374151;
            background: #111827;
            color: #e5e7eb;
            cursor: pointer;
            font-size: 14px;
        }

        .upload-btn button:hover {
            background: #0f172a;
        }

        .metrics {
            display: flex;
            gap: 16px;
            margin: 12px 0 20px;
            font-size: 14px;
            color: #9ca3af;
        }

        .card {
            background: #0f172a;
            border: 1px solid #1f2937;
            border-radius: 14px;
            padding: 14px 16px;
        }

        /* Leave spacing between cards to avoid stacked or crowded visuals */
        .card+.card {
            margin-top: 12px;
        }

        /* Chat box stays scrollable while hiding the scrollbar (gestures still work) */
        #messages {
            max-height: 48vh;
            overflow-y: auto;
            overscroll-behavior: contain;
            -ms-overflow-style: none;
            /* Legacy IE/Edge */
            scrollbar-width: none;
            /* Firefox */
        }

        /* Chrome/Safari/Edge (WebKit/Blink) hide the scrollbar track */
        #messages::-webkit-scrollbar {
            width: 0;
            height: 0;
        }

        .msg {
            border-bottom: 1px dashed #1f2937;
            padding: 10px 0;
            white-space: pre-wrap;
            word-break: break-word;
        }

        .msg:last-child {
            border-bottom: none;
        }

        .role {
            font-size: 12px;
            color: #9ca3af;
            margin-right: 8px;
            text-transform: uppercase;
        }

        .user .role {
            color: #93c5fd;
        }

        .assistant .role {
            color: #a7f3d0;
        }

        /* Display front-end model metadata and system logs (info role) */
        .info .role {
            color: #fbbf24;
            /* amber */
        }

        footer {
            padding: 20px;
            border-top: 1px solid #1f2937;
            color: #6b7280;
            text-align: center;
            font-size: 12px;
        }

        /* Waveform canvas styles */
        #waveform {
            width: 100%;
            height: 100px;
            display: block;
        }

        #waveform-card {
            margin-bottom: 12px;
        }

        .hidden {
            display: none !important;
        }

        /* Mobile tweaks so the waveform is taller and easier to read */
        @media (max-width: 768px) {
            #waveform {
                height: 28vh;
            }

            #messages {
                max-height: 54vh;
                /* Give more vertical space to chat on phones */
            }
        }

        @media (max-width: 480px) {
            #waveform {
                height: 32vh;
            }

            #messages {
                max-height: 58vh;
            }
        }