diff --git a/core/exporters.py b/core/exporters.py
deleted file mode 100644
index 6e22306..0000000
--- a/core/exporters.py
+++ /dev/null
@@ -1,188 +0,0 @@
-"""
-Export singing segments to various formats:
-  - EDL (DaVinci Resolve timeline import)
-  - CSV (human-readable)
-  - DaVinci Resolve Markers CSV
-  - JSON (programmatic)
-  - ffmpeg concat script (auto-cut)
-"""
-
-import csv
-import json
-import os
-import sys
-from pathlib import Path
-
-from utils.formats import format_timecode, seconds_to_smpte
-
-
-def export_edl(segments: list, output_path: str, fps: float = 29.97,
-               title: str = "Singing Segments", source_filename: str = None):
-    """Export EDL file for DaVinci Resolve."""
-    if source_filename:
-        clip_name = source_filename
-        reel_name_safe = Path(source_filename).stem[:32].replace(" ", "_")
-    else:
-        clip_name = None
-        reel_name_safe = "001"
-
-    rec_offset = 3600.0
-
-    with open(output_path, "w", encoding="utf-8") as f:
-        f.write(f"TITLE: {title}\n")
-        f.write("FCM: NON-DROP FRAME\n\n")
-
-        current_rec_pos = rec_offset
-        for seg in segments:
-            edit_num = f"{seg['index']:03d}"
-            src_in = seconds_to_smpte(seg["start"], fps)
-            src_out = seconds_to_smpte(seg["end"], fps)
-            rec_in = seconds_to_smpte(current_rec_pos, fps)
-            rec_out = seconds_to_smpte(current_rec_pos + seg["duration"], fps)
-
-            f.write(f"{edit_num}  {reel_name_safe}  V     C        {src_in} {src_out} {rec_in} {rec_out}\n")
-
-            if clip_name:
-                f.write(f"* FROM CLIP NAME: {clip_name}\n")
-
-            f.write(f"* COMMENT: Song {seg['index']} - Duration {seg['duration']:.0f}s\n\n")
-            current_rec_pos += seg["duration"]
-
-
-def export_csv(segments: list, output_path: str):
-    """Export singing segments as CSV."""
-    with open(output_path, "w", newline="", encoding="utf-8") as f:
-        writer = csv.writer(f)
-        writer.writerow(["index", "start_sec", "end_sec", "duration_sec",
-                         "start_timecode", "end_timecode"])
-        for seg in segments:
-            writer.writerow([
-                seg["index"],
-                f"{seg['start']:.2f}",
-                f"{seg['end']:.2f}",
-                f"{seg['duration']:.1f}",
-                format_timecode(seg["start"]),
-                format_timecode(seg["end"]),
-            ])
-
-
-def export_markers_csv(segments: list, output_path: str, fps: float = 29.97):
-    """Export DaVinci Resolve Markers CSV."""
-    with open(output_path, "w", newline="", encoding="utf-8") as f:
-        writer = csv.writer(f)
-        writer.writerow(["#", "Color", "Name", "Start TC", "End TC", "Duration TC", "Notes"])
-        for seg in segments:
-            writer.writerow([
-                seg["index"],
-                "Blue",
-                f"Song {seg['index']}",
-                seconds_to_smpte(seg["start"], fps),
-                seconds_to_smpte(seg["end"], fps),
-                seconds_to_smpte(seg["duration"], fps),
-                f"Duration: {seg['duration']:.0f}s",
-            ])
-
-
-def export_json(segments: list, output_path: str):
-    """Export as JSON."""
-    with open(output_path, "w", encoding="utf-8") as f:
-        json.dump(segments, f, indent=2, ensure_ascii=False)
-
-
-def export_ffmpeg_script(segments: list, video_path: str, output_dir: str):
-    """
-    Export a script that uses ffmpeg to cut and concatenate all
-    singing segments into a single video file.
-    """
-    video_name = Path(video_path).stem
-    ext = Path(video_path).suffix
-    out_video = str(Path(output_dir) / f"{video_name}_singing_only{ext}")
-
-    is_windows = os.name == "nt" or sys.platform == "win32"
-    script_ext = ".bat" if is_windows else ".sh"
-    script_path = str(Path(output_dir) / f"{video_name}_autocut{script_ext}")
-    concat_list_path = str(Path(output_dir) / f"{video_name}_concat_list.txt")
-
-    lines = []
-    if is_windows:
-        lines.append("@echo off")
-        lines.append("REM Auto-generated ffmpeg script to extract singing segments")
-        lines.append(f'REM Source: {video_path}')
-        lines.append("")
-    else:
-        lines.append("#!/bin/bash")
-        lines.append("# Auto-generated ffmpeg script to extract singing segments")
-        lines.append(f'# Source: {video_path}')
-        lines.append("")
-
-    segment_files = []
-    for seg in segments:
-        seg_file = f"_seg_{seg['index']:03d}{ext}"
-        seg_path = str(Path(output_dir) / seg_file)
-        segment_files.append(seg_file)
-
-        cmd = (f'ffmpeg -y -ss {seg["start"]:.2f} -i "{video_path}" '
-               f'-t {seg["duration"]:.2f} -c copy "{seg_path}"')
-        lines.append(f"echo Extracting Song {seg['index']}...")
-        lines.append(cmd)
-        lines.append("")
-
-    lines.append("echo Creating concat list...")
-    if is_windows:
-        lines.append("(")
-        for sf in segment_files:
-            seg_path = str(Path(output_dir) / sf)
-            lines.append(f"  echo file '{seg_path}'")
-        lines.append(f') > "{concat_list_path}"')
-    else:
-        for i, sf in enumerate(segment_files):
-            seg_path = str(Path(output_dir) / sf)
-            op = ">" if i == 0 else ">>"
-            lines.append(f"echo \"file '{seg_path}'\" {op} \"{concat_list_path}\"")
-
-    lines.append("")
-    lines.append("echo Concatenating all segments...")
-    lines.append(f'ffmpeg -y -f concat -safe 0 -i "{concat_list_path}" -c copy "{out_video}"')
-    lines.append("")
-    lines.append("echo Cleaning up temp files...")
-
-    for sf in segment_files:
-        seg_path = str(Path(output_dir) / sf)
-        if is_windows:
-            lines.append(f'del "{seg_path}"')
-        else:
-            lines.append(f'rm -f "{seg_path}"')
-    if is_windows:
-        lines.append(f'del "{concat_list_path}"')
-    else:
-        lines.append(f'rm -f "{concat_list_path}"')
-
-    lines.append("")
-    lines.append(f'echo Done! Output: {out_video}')
-    if is_windows:
-        lines.append("pause")
-
-    with open(script_path, "w", encoding="utf-8") as f:
-        f.write("\n".join(lines))
-
-    if not is_windows:
-        os.chmod(script_path, 0o755)
-
-    return script_path
-
-
-def export_raw_segments(segments: list, output_path: str):
-    """Export ALL raw segments (speech/music/noise) as CSV for debugging."""
-    with open(output_path, "w", newline="", encoding="utf-8") as f:
-        writer = csv.writer(f)
-        writer.writerow(["label", "start_sec", "end_sec", "duration_sec",
-                         "start_timecode", "end_timecode"])
-        for label, start, end in segments:
-            writer.writerow([
-                label,
-                f"{start:.2f}",
-                f"{end:.2f}",
-                f"{end - start:.1f}",
-                format_timecode(start),
-                format_timecode(end),
-            ])
diff --git a/core/fftools.py b/core/fftools.py
deleted file mode 100644
index d3a7ac1..0000000
--- a/core/fftools.py
+++ /dev/null
@@ -1,99 +0,0 @@
-"""
-ffmpeg / ffprobe discovery and probing helpers.
-Shared by both concat and singing detection features.
-"""
-
-import json
-import os
-import shutil
-import subprocess
-import sys
-from pathlib import Path
-
-# ── Suppress console windows on Windows ──────────────────────────────────────
-_NO_WINDOW: dict = {}
-if sys.platform == "win32":
-    _NO_WINDOW["creationflags"] = subprocess.CREATE_NO_WINDOW
-
-
-def app_dir() -> str:
-    if getattr(sys, "frozen", False):
-        return os.path.dirname(sys.executable)
-    return os.path.dirname(os.path.abspath(__file__))
-
-
-def find_tool(name: str) -> str | None:
-    """Locate ffmpeg / ffprobe next to the exe / script, then on PATH."""
-    base = app_dir()
-    for sub in ["_internal", "..", ""]:
-        for variant in [name + ".exe", name]:
-            p = os.path.join(base, sub, variant)
-            if os.path.exists(p):
-                return os.path.abspath(p)
-    return shutil.which(name + ".exe") or shutil.which(name)
-
-
-def probe_duration(path: str, ffprobe_bin: str | None = None) -> float:
-    """Get video/audio duration in seconds via ffprobe."""
-    ffprobe = ffprobe_bin or find_tool("ffprobe")
-    if not ffprobe:
-        return 0.0
-    try:
-        r = subprocess.run(
-            [ffprobe, "-v", "error",
-             "-show_entries", "format=duration",
-             "-of", "json", path],
-            stdout=subprocess.PIPE, stderr=subprocess.PIPE,
-            text=True, timeout=20,
-            **_NO_WINDOW,
-        )
-        if r.returncode != 0:
-            return 0.0
-        data = json.loads(r.stdout or "{}")
-        return max(0.0, float(data.get("format", {}).get("duration", 0) or 0))
-    except Exception:
-        return 0.0
-
-
-def extract_audio(video_path: str, output_wav: str,
-                  ffmpeg_bin: str | None = None,
-                  progress_cb=None) -> str:
-    """
-    Extract audio from video file as 16kHz mono WAV.
-    Required format for inaSpeechSegmenter.
-    
-    progress_cb: optional callable(message: str) for status updates.
-    """
-    ffmpeg = ffmpeg_bin or find_tool("ffmpeg")
-    if not ffmpeg:
-        raise FileNotFoundError("ffmpeg not found. Install ffmpeg and add to PATH.")
-
-    if progress_cb:
-        progress_cb(f"Extracting audio from: {Path(video_path).name}")
-
-    cmd = [
-        ffmpeg,
-        "-i", video_path,
-        "-vn",
-        "-acodec", "pcm_s16le",
-        "-ar", "16000",
-        "-ac", "1",
-        "-y",
-        output_wav,
-    ]
-
-    result = subprocess.run(
-        cmd,
-        capture_output=True,
-        text=True,
-        timeout=1800,
-        **_NO_WINDOW,
-    )
-    if result.returncode != 0:
-        raise RuntimeError(f"ffmpeg failed:\n{result.stderr[-500:]}")
-
-    if progress_cb:
-        size_mb = os.path.getsize(output_wav) / (1024 * 1024)
-        progress_cb(f"Audio extracted: {size_mb:.1f} MB")
-
-    return output_wav
diff --git a/core/segmenter.py b/core/segmenter.py
deleted file mode 100644
index b30bba8..0000000
--- a/core/segmenter.py
+++ /dev/null
@@ -1,118 +0,0 @@
-"""
-Singing segment detection via inaSpeechSegmenter.
-
-Pipeline:
-  1. Run inaSpeechSegmenter to classify speech/music/noise
-  2. Filter for 'music' segments (singing voice is classified as music)
-  3. Merge nearby segments, apply padding, filter by minimum duration
-"""
-
-import time
-from utils.formats import format_timecode
-
-
-def check_segmenter_available() -> tuple[bool, str]:
-    """Check if inaSpeechSegmenter is installed."""
-    try:
-        from inaSpeechSegmenter import Segmenter  # noqa: F401
-        return True, ""
-    except ImportError:
-        return False, (
-            "inaSpeechSegmenter is not installed.\n\n"
-            "Install it with:\n"
-            "  pip install inaSpeechSegmenter\n\n"
-            "You also need TensorFlow:\n"
-            "  pip install tensorflow[and-cuda]   (GPU)\n"
-            "  pip install tensorflow              (CPU)"
-        )
-
-
-def run_segmentation(wav_path: str, progress_cb=None) -> list:
-    """
-    Run inaSpeechSegmenter on audio file.
-    Returns list of (label, start_sec, end_sec) tuples.
-    Labels: 'music', 'speech', 'noise', 'noEnergy'
-    """
-    from inaSpeechSegmenter import Segmenter
-
-    if progress_cb:
-        progress_cb("Loading segmentation model…")
-
-    start_time = time.time()
-    seg = Segmenter(vad_engine='smn', detect_gender=False)
-
-    if progress_cb:
-        progress_cb("Running audio segmentation (this may take a while)…")
-
-    segments = seg(wav_path)
-    elapsed = time.time() - start_time
-
-    if progress_cb:
-        progress_cb(f"Segmentation complete in {elapsed:.1f}s — {len(segments)} raw segments")
-
-    return segments
-
-
-def merge_singing_segments(
-    segments: list,
-    max_gap: float = 10.0,
-    min_duration: float = 20.0,
-    padding: float = 2.0,
-) -> list:
-    """
-    Filter for 'music' segments and merge nearby ones.
-    
-    Returns list of dicts:
-        [{"index", "start", "end", "duration", "original_start", "original_end"}, ...]
-    """
-    music_segs = [(start, end) for label, start, end in segments if label == "music"]
-
-    if not music_segs:
-        return []
-
-    music_segs.sort(key=lambda x: x[0])
-
-    # Merge segments with gaps smaller than max_gap
-    merged = []
-    current_start, current_end = music_segs[0]
-
-    for start, end in music_segs[1:]:
-        if start - current_end <= max_gap:
-            current_end = max(current_end, end)
-        else:
-            merged.append((current_start, current_end))
-            current_start, current_end = start, end
-    merged.append((current_start, current_end))
-
-    # Apply padding and minimum duration filter
-    results = []
-    idx = 1
-    for start, end in merged:
-        duration = end - start
-        if duration >= min_duration:
-            padded_start = max(0, start - padding)
-            padded_end = end + padding
-            results.append({
-                "index": idx,
-                "start": padded_start,
-                "end": padded_end,
-                "duration": padded_end - padded_start,
-                "original_start": start,
-                "original_end": end,
-            })
-            idx += 1
-
-    return results
-
-
-def get_segment_stats(segments: list) -> dict:
-    """Get summary statistics from raw segmentation output."""
-    type_counts = {}
-    type_durations = {}
-    for label, start, end in segments:
-        type_counts[label] = type_counts.get(label, 0) + 1
-        type_durations[label] = type_durations.get(label, 0) + (end - start)
-    return {
-        "counts": type_counts,
-        "durations": type_durations,
-    }
diff --git a/detect.rs b/detect.rs
new file mode 100644
index 0000000..342ece4
--- /dev/null
+++ b/detect.rs
@@ -0,0 +1,222 @@
+//! Singing-segment detection.
+//!
+//! Rust owns the fast/IO parts (audio extraction via ffmpeg, progress events,
+//! and all file exports). The Python sidecar owns *only* the ML step
+//! (inaSpeechSegmenter + TensorFlow), which has no native equivalent.
+//!
+//! Protocol: the sidecar prints one JSON object per line to stdout:
+//!   {"type":"progress","message":"…"}
+//!   {"type":"result","segments":[{index,start,end,duration}, …],
+//!                     "stats":{"music":123.4,"speech":456.7,…}}
+//!   {"type":"error","message":"…"}
+
+use std::io::{BufRead, BufReader};
+use std::path::{Path, PathBuf};
+use std::process::{Command, Stdio};
+
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use tauri::{AppHandle, Emitter};
+
+use crate::tools::hide_window;
+use crate::AppState;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Segment {
+    pub index: u32,
+    pub start: f64,
+    pub end: f64,
+    pub duration: f64,
+}
+
+#[derive(Clone, Serialize)]
+pub struct DetectResult {
+    pub segments: Vec<Segment>,
+    pub stats: Value,
+}
+
+#[derive(Clone, Serialize)]
+struct DetectProgress {
+    message: String,
+}
+
+fn emit(app: &AppHandle, message: impl Into<String>) {
+    let _ = app.emit("detect-progress", DetectProgress { message: message.into() });
+}
+
+/// Locate the sidecar script: bundled resources first, dev tree as fallback.
+fn sidecar_script() -> Option<PathBuf> {
+    if let Ok(p) = std::env::var("STREAM_STUDIO_SIDECAR") {
+        let pb = PathBuf::from(p);
+        if pb.exists() {
+            return Some(pb);
+        }
+    }
+    if let Ok(exe) = std::env::current_exe() {
+        if let Some(base) = exe.parent() {
+            for sub in ["sidecar", "resources/sidecar", "../sidecar"] {
+                let cand = base.join(sub).join("detect.py");
+                if cand.exists() {
+                    return Some(cand);
+                }
+            }
+        }
+    }
+    // Dev fallback: <crate>/../sidecar/detect.py
+    let dev = Path::new(env!("CARGO_MANIFEST_DIR")).join("../sidecar/detect.py");
+    if dev.exists() {
+        return Some(dev);
+    }
+    None
+}
+
+/// Build the python invocation. Prefers the Windows `py -3.10` launcher
+/// (TensorFlow does not yet support 3.12+), then a venv, then plain `python`.
+fn python_command(script: &Path) -> Command {
+    if let Ok(custom) = std::env::var("STREAM_STUDIO_PYTHON") {
+        let mut c = Command::new(custom);
+        c.arg(script);
+        return c;
+    }
+    #[cfg(windows)]
+    {
+        // The py launcher lets us pin 3.10 regardless of the default install.
+        let mut c = Command::new("py");
+        c.args(["-3.10"]).arg(script);
+        return c;
+    }
+    #[allow(unreachable_code)]
+    {
+        let mut c = Command::new("python");
+        c.arg(script);
+        c
+    }
+}
+
+/// Extract 16 kHz mono WAV (the format inaSpeechSegmenter expects).
+fn extract_audio(app: &AppHandle, ffmpeg: &str, video: &str, wav: &Path) -> Result<(), String> {
+    emit(app, "Extracting audio (16 kHz mono)…");
+    let mut cmd = Command::new(ffmpeg);
+    cmd.args([
+        "-y", "-i", video,
+        "-vn", "-acodec", "pcm_s16le", "-ar", "16000", "-ac", "1",
+        "-hide_banner", "-loglevel", "error",
+        &wav.to_string_lossy(),
+    ]);
+    cmd.stdout(Stdio::null()).stderr(Stdio::piped());
+    hide_window(&mut cmd);
+    let out = cmd.output().map_err(|e| format!("ffmpeg audio extract failed: {e}"))?;
+    if !out.status.success() {
+        return Err(format!("Audio extraction failed:\n{}", String::from_utf8_lossy(&out.stderr)));
+    }
+    Ok(())
+}
+
+pub fn run(
+    app: &AppHandle,
+    state: &AppState,
+    ffmpeg: &str,
+    video: String,
+    gap: f64,
+    min_duration: f64,
+    padding: f64,
+) -> Result<DetectResult, String> {
+    state.cancel.store(false, std::sync::atomic::Ordering::SeqCst);
+
+    let script = sidecar_script().ok_or(
+        "Detection sidecar not found. Expected sidecar/detect.py next to the app.",
+    )?;
+
+    // Temp WAV beside the source video.
+    let wav = Path::new(&video)
+        .with_extension("")
+        .to_string_lossy()
+        .to_string();
+    let wav = PathBuf::from(format!("{wav}.stream_studio.wav"));
+
+    extract_audio(app, ffmpeg, &video, &wav)?;
+
+    let mut cmd = python_command(&script);
+    cmd.args([
+        "--wav", &wav.to_string_lossy(),
+        "--gap", &gap.to_string(),
+        "--min-duration", &min_duration.to_string(),
+        "--padding", &padding.to_string(),
+    ]);
+    cmd.stdout(Stdio::piped()).stderr(Stdio::piped());
+    cmd.env("PYTHONUNBUFFERED", "1").env("PYTHONIOENCODING", "utf-8");
+    hide_window(&mut cmd);
+
+    emit(app, "Loading detection model…");
+    let mut child = cmd.spawn().map_err(|e| {
+        format!("Could not start Python sidecar ({e}). Is Python 3.10 + inaSpeechSegmenter installed?")
+    })?;
+    let stdout = child.stdout.take().ok_or("No sidecar stdout")?;
+    let stderr = child.stderr.take();
+    *state.proc.lock().unwrap() = Some(child);
+
+    let mut result: Option<DetectResult> = None;
+    let mut err_msg: Option<String> = None;
+
+    for line in BufReader::new(stdout).lines() {
+        let line = match line {
+            Ok(l) => l,
+            Err(_) => break,
+        };
+        let line = line.trim();
+        if line.is_empty() {
+            continue;
+        }
+        let parsed: Value = match serde_json::from_str(line) {
+            Ok(v) => v,
+            Err(_) => continue, // ignore stray non-JSON output
+        };
+        match parsed.get("type").and_then(|t| t.as_str()) {
+            Some("progress") => {
+                if let Some(m) = parsed.get("message").and_then(|m| m.as_str()) {
+                    emit(app, m);
+                }
+            }
+            Some("result") => {
+                let segments: Vec<Segment> = serde_json::from_value(
+                    parsed.get("segments").cloned().unwrap_or(Value::Array(vec![])),
+                )
+                .unwrap_or_default();
+                let stats = parsed.get("stats").cloned().unwrap_or(Value::Null);
+                result = Some(DetectResult { segments, stats });
+            }
+            Some("error") => {
+                err_msg = parsed
+                    .get("message")
+                    .and_then(|m| m.as_str())
+                    .map(|s| s.to_string());
+            }
+            _ => {}
+        }
+    }
+
+    let mut child = state.proc.lock().unwrap().take().ok_or("Sidecar vanished")?;
+    let status = child.wait().map_err(|e| format!("sidecar wait failed: {e}"))?;
+    let mut stderr_text = String::new();
+    if let Some(mut se) = stderr {
+        use std::io::Read;
+        let _ = se.read_to_string(&mut stderr_text);
+    }
+
+    let _ = std::fs::remove_file(&wav);
+
+    if state.cancel.load(std::sync::atomic::Ordering::SeqCst) {
+        return Err("__cancelled__".into());
+    }
+    if let Some(m) = err_msg {
+        return Err(m);
+    }
+    if let Some(r) = result {
+        return Ok(r);
+    }
+    if !status.success() {
+        let tail: String = stderr_text.chars().rev().take(800).collect::<String>().chars().rev().collect();
+        return Err(format!("Detection failed.\n{tail}"));
+    }
+    Err("Detection produced no result.".into())
+}
diff --git a/detect.ts b/detect.ts
new file mode 100644
index 0000000..9d8be28
--- /dev/null
+++ b/detect.ts
@@ -0,0 +1,129 @@
+// Detect view — find singing segments in one video, export editor markers.
+
+import { h, clear, basename, fmtDur } from "../dom";
+import { makeProgress, toast, renderSongs } from "../ui";
+import {
+  pickVideo, detectSongs, cancel, exportSegments, onDetectProgress, reveal,
+  type Segment,
+} from "../api";
+
+export interface View { el: HTMLElement; onDrop: (paths: string[]) => void; setVideo: (p: string) => void; }
+
+const FPS = ["29.97", "25", "23.976", "30", "60"];
+
+function numField(label: string, value: number, step = "1"): [HTMLElement, HTMLInputElement] {
+  const input = h("input", { class: "input", type: "number", value: String(value), step, min: "0" }) as HTMLInputElement;
+  return [h("div", { class: "field" }, h("label", {}, label), input), input];
+}
+
+export function buildDetect(): View {
+  let running = false;
+  let segments: Segment[] = [];
+  let videoPath = "";
+
+  const videoInput = h("input", { class: "input grow", placeholder: "Select a video…", readonly: true }) as HTMLInputElement;
+  const [gapF, gapI] = numField("Merge gap (s)", 10);
+  const [minF, minI] = numField("Min duration (s)", 20);
+  const [padF, padI] = numField("Padding (s)", 2);
+  const fpsSel = h("select", { class: "input" }, ...FPS.map((f) => h("option", { value: f }, f))) as HTMLSelectElement;
+
+  const detectBtn = h("button", { class: "btn primary lg", disabled: true }, "🎤  Detect Songs") as HTMLButtonElement;
+  const stopBtn = h("button", { class: "btn danger", disabled: true }, "■ Stop") as HTMLButtonElement;
+  const exportBtn = h("button", { class: "btn", disabled: true }, "⬇ Export EDL / CSV") as HTMLButtonElement;
+  const revealBtn = h("button", { class: "btn ghost", style: "display:none" }, "Show in folder") as HTMLButtonElement;
+  const progress = makeProgress();
+  const statsEl = h("div", { class: "pills" });
+  const songsEl = h("div", { class: "songs" });
+  let lastExportDir = "";
+
+  function setVideo(p: string) {
+    videoPath = p;
+    videoInput.value = basename(p);
+    videoInput.title = p;
+    detectBtn.disabled = running || !p;
+  }
+
+  async function detect() {
+    if (!videoPath) return;
+    running = true;
+    detectBtn.disabled = true;
+    stopBtn.disabled = false;
+    exportBtn.disabled = true;
+    revealBtn.style.display = "none";
+    clear(songsEl); clear(statsEl);
+    progress.reset();
+    progress.indeterminate(true, "Starting detection…");
+
+    const un = await onDetectProgress((msg) => {
+      progress.indeterminate(true, msg);
+      progress.appendLog(msg);
+    });
+
+    try {
+      const res = await detectSongs(videoPath, +gapI.value, +minI.value, +padI.value);
+      segments = res.segments;
+      progress.indeterminate(false);
+      progress.set(1, `Found ${segments.length} singing segment(s).`);
+      renderSongs(songsEl, segments);
+      const totalSing = segments.reduce((a, s) => a + s.duration, 0);
+      statsEl.replaceChildren(
+        h("span", { class: "pill" }, `${segments.length} songs`),
+        h("span", { class: "pill" }, `singing ${fmtDur(totalSing)}`),
+        ...Object.entries(res.stats || {}).map(([k, v]) =>
+          h("span", { class: "pill" }, `${k} ${fmtDur(v as number)}`)),
+      );
+      exportBtn.disabled = segments.length === 0;
+      if (!segments.length) toast("No singing detected — try a larger gap or smaller min duration.", "");
+    } catch (e) {
+      const msg = String(e);
+      progress.indeterminate(false);
+      if (msg.includes("__cancelled__")) progress.set(0, "Stopped by user.");
+      else { progress.set(0, "Detection failed."); toast(msg, "err"); }
+    } finally {
+      un();
+      running = false;
+      stopBtn.disabled = true;
+      detectBtn.disabled = !videoPath;
+    }
+  }
+
+  exportBtn.addEventListener("click", async () => {
+    if (!segments.length) return;
+    try {
+      const res = await exportSegments(segments, videoPath, null, +fpsSel.value);
+      lastExportDir = res.files[0] ?? "";
+      toast(`Exported ${res.files.length} files`, "ok");
+      if (lastExportDir) revealBtn.style.display = "";
+    } catch (e) { toast(String(e), "err"); }
+  });
+  revealBtn.addEventListener("click", () => lastExportDir && reveal(lastExportDir));
+  detectBtn.addEventListener("click", detect);
+  stopBtn.addEventListener("click", () => cancel());
+
+  const el = h("div", { class: "view" },
+    h("div", { class: "card" },
+      h("h2", {}, h("span", { class: "step" }, "1"), "Source Video"),
+      h("div", { class: "row" }, videoInput,
+        h("button", { class: "btn", onclick: async () => { const p = await pickVideo(); if (p) setVideo(p); } }, "Browse…")),
+      h("div", { class: "hint", style: "margin-top:8px" }, "Tip: drop a file here, or use a Concat output."),
+    ),
+    h("div", { class: "card" },
+      h("h2", {}, h("span", { class: "step" }, "2"), "Detection Settings"),
+      h("div", { class: "row wrap" },
+        h("div", { class: "grow", style: "min-width:130px" }, gapF),
+        h("div", { class: "grow", style: "min-width:130px" }, minF),
+        h("div", { class: "grow", style: "min-width:130px" }, padF),
+        h("div", { class: "field", style: "min-width:120px" }, h("label", {}, "FPS (export)"), fpsSel)),
+      h("div", { class: "hint", style: "margin-top:8px" }, "Singing = \"music\". More chatting between songs → raise the gap. Short covers → lower the min duration."),
+    ),
+    h("div", { class: "card" },
+      h("h2", {}, h("span", { class: "step" }, "3"), "Run"),
+      h("div", { class: "row", style: "margin-bottom:14px" }, detectBtn, stopBtn, exportBtn, revealBtn),
+      progress.root,
+      h("div", { style: "margin-top:12px" }, statsEl),
+      h("div", { style: "margin-top:10px" }, songsEl),
+    ),
+  );
+
+  return { el, onDrop: (paths) => { if (paths[0]) setVideo(paths[0]); }, setVideo };
+}
diff --git a/sidecar_detect.py b/sidecar_detect.py
new file mode 100644
index 0000000..c4f93c9
--- /dev/null
+++ b/sidecar_detect.py
@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+"""
+Stream Studio — singing-detection sidecar.
+
+This is the ONLY Python in the project. It exists solely because the ML model
+(inaSpeechSegmenter, which classifies singing voice as "music") is TensorFlow-
+based and has no native Rust/JS equivalent. Everything else — UI, ffmpeg
+concat, audio extraction, file exports — is handled by the Tauri/Rust host.
+
+Contract (line-delimited JSON on stdout):
+    {"type": "progress", "message": "..."}
+    {"type": "result", "segments": [{"index","start","end","duration"}...],
+                        "stats": {"music": 123.4, "speech": 456.7, ...}}
+    {"type": "error",   "message": "..."}
+
+The host extracts a 16 kHz mono WAV and passes it via --wav, so this script
+never touches ffmpeg.
+
+Run with Python 3.10 (TensorFlow does not support 3.12+):
+    py -3.10 detect.py --wav audio.wav --gap 10 --min-duration 20 --padding 2
+"""
+
+import argparse
+import json
+import sys
+import time
+
+
+def emit(obj: dict) -> None:
+    """Write one JSON record per line and flush immediately."""
+    sys.stdout.write(json.dumps(obj, ensure_ascii=False) + "\n")
+    sys.stdout.flush()
+
+
+def progress(msg: str) -> None:
+    emit({"type": "progress", "message": msg})
+
+
+def merge_singing_segments(segments, max_gap, min_duration, padding):
+    """Filter for 'music' segments and merge nearby ones into songs."""
+    music = sorted((s, e) for label, s, e in segments if label == "music")
+    if not music:
+        return []
+
+    merged = []
+    cur_start, cur_end = music[0]
+    for s, e in music[1:]:
+        if s - cur_end <= max_gap:
+            cur_end = max(cur_end, e)
+        else:
+            merged.append((cur_start, cur_end))
+            cur_start, cur_end = s, e
+    merged.append((cur_start, cur_end))
+
+    results = []
+    idx = 1
+    for s, e in merged:
+        if (e - s) >= min_duration:
+            ps = max(0.0, s - padding)
+            pe = e + padding
+            results.append({
+                "index": idx,
+                "start": round(ps, 3),
+                "end": round(pe, 3),
+                "duration": round(pe - ps, 3),
+            })
+            idx += 1
+    return results
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--wav", required=True)
+    ap.add_argument("--gap", type=float, default=10.0)
+    ap.add_argument("--min-duration", type=float, default=20.0)
+    ap.add_argument("--padding", type=float, default=2.0)
+    args = ap.parse_args()
+
+    try:
+        progress("Loading detection model (first run downloads weights)…")
+        from inaSpeechSegmenter import Segmenter
+    except ImportError:
+        emit({
+            "type": "error",
+            "message": (
+                "inaSpeechSegmenter is not installed for this Python.\n"
+                "Install it with:\n"
+                "  py -3.10 -m pip install inaSpeechSegmenter tensorflow"
+            ),
+        })
+        return 1
+
+    try:
+        t0 = time.time()
+        seg = Segmenter(vad_engine="smn", detect_gender=False)
+        progress("Analysing audio — this can take a while on long streams…")
+        raw = seg(args.wav)
+        progress(f"Segmentation done in {time.time() - t0:.0f}s ({len(raw)} raw segments).")
+
+        stats = {}
+        for label, s, e in raw:
+            stats[label] = round(stats.get(label, 0.0) + (e - s), 1)
+
+        songs = merge_singing_segments(raw, args.gap, args.min_duration, args.padding)
+        progress(f"Found {len(songs)} singing segment(s) after merge + filter.")
+        emit({"type": "result", "segments": songs, "stats": stats})
+        return 0
+    except Exception as exc:  # noqa: BLE001 — surface any model/runtime error to the host
+        emit({"type": "error", "message": f"{type(exc).__name__}: {exc}"})
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/ui/tab_detect.py b/ui/tab_detect.py
deleted file mode 100644
index 5b1d9bd..0000000
--- a/ui/tab_detect.py
+++ /dev/null
@@ -1,505 +0,0 @@
-"""
-Tab 2: Song Detection
-Detect singing segments in a video and export EDL/CSV/JSON for DaVinci Resolve.
-"""
-
-import os
-import threading
-import tkinter as tk
-from pathlib import Path
-from tkinter import filedialog, messagebox
-
-import customtkinter as ctk
-
-from core.fftools import find_tool, extract_audio
-from core.segmenter import check_segmenter_available, run_segmentation, merge_singing_segments, get_segment_stats
-from core.exporters import export_edl, export_csv, export_markers_csv, export_json, export_ffmpeg_script
-from utils.formats import format_timecode, fmt_dur, fmt_elapsed
-from ui.theme import BTN_NEUTRAL, ACCENT_PURPLE, ACCENT_GREEN
-
-
-class DetectTab:
-    """Song detection tab."""
-
-    VIDEO_EXTS = {".mp4", ".mov", ".mkv", ".avi", ".flv",
-                  ".ts", ".wmv", ".m4v", ".webm", ".mts", ".m2ts"}
-
-    def __init__(self, parent_frame, app):
-        self.frame = parent_frame
-        self.app = app
-        self.ffmpeg = app.ffmpeg
-
-        # State
-        self.input_path_var = tk.StringVar(value="")
-        self.output_dir_var = tk.StringVar(value="")
-        self.gap_var = tk.DoubleVar(value=10.0)
-        self.min_dur_var = tk.DoubleVar(value=20.0)
-        self.padding_var = tk.DoubleVar(value=2.0)
-        self.fps_var = tk.DoubleVar(value=29.97)
-        self.autocut_var = tk.BooleanVar(value=False)
-
-        self._running = False
-        self._stop_req = False
-
-        # Results
-        self._singing_segments = []
-        self._raw_segments = []
-
-        self._build_ui()
-        self._check_deps()
-
-    # ══════════════════════════════════════════════════════════════════════════
-    #  UI
-    # ══════════════════════════════════════════════════════════════════════════
-
-    def _build_ui(self):
-        scroll = ctk.CTkScrollableFrame(self.frame, corner_radius=12)
-        scroll.pack(fill="both", expand=True, padx=4, pady=4)
-
-        self._build_sec_input(scroll)
-        self._build_sec_params(scroll)
-        self._build_sec_run(scroll)
-        self._build_sec_results(scroll)
-
-    def _section(self, parent, title):
-        f = ctk.CTkFrame(parent, corner_radius=12)
-        hdr = ctk.CTkFrame(f, fg_color="transparent")
-        hdr.pack(fill="x", padx=14, pady=(10, 0))
-        ctk.CTkLabel(hdr, text=title,
-                     font=ctk.CTkFont(size=13, weight="bold")).pack(side="left")
-        ctk.CTkFrame(f, height=1, fg_color=("gray78", "gray32")).pack(
-            fill="x", padx=14, pady=(6, 0))
-        return f
-
-    # ── Input ─────────────────────────────────────────────────────────────────
-
-    def _build_sec_input(self, parent):
-        sec = self._section(parent, "1 · Input Video")
-        sec.pack(fill="x", pady=(0, 12))
-
-        body = ctk.CTkFrame(sec, fg_color="transparent")
-        body.pack(fill="x", padx=14, pady=(10, 4))
-
-        r1 = ctk.CTkFrame(body, fg_color="transparent")
-        r1.pack(fill="x", pady=(0, 4))
-        ctk.CTkLabel(r1, text="Video file:", width=96, anchor="w").pack(side="left")
-        ctk.CTkEntry(r1, textvariable=self.input_path_var).pack(side="left", fill="x", expand=True)
-        ctk.CTkButton(r1, text="Browse…", width=100, command=self._pick_input,
-                      **BTN_NEUTRAL).pack(side="left", padx=(8, 0))
-
-        # "Use Concat Output" button
-        self.use_concat_btn = ctk.CTkButton(
-            body, text="📎  Use Concat Output", width=200,
-            fg_color=ACCENT_PURPLE["fg"], text_color=ACCENT_PURPLE["text"],
-            hover_color=ACCENT_PURPLE["hover"],
-            command=self._use_concat_output)
-        self.use_concat_btn.pack(anchor="w", pady=(4, 4))
-
-        r2 = ctk.CTkFrame(body, fg_color="transparent")
-        r2.pack(fill="x", pady=(4, 0))
-        ctk.CTkLabel(r2, text="Output dir:", width=96, anchor="w").pack(side="left")
-        ctk.CTkEntry(r2, textvariable=self.output_dir_var).pack(side="left", fill="x", expand=True)
-        ctk.CTkButton(r2, text="Browse…", width=100, command=self._pick_output_dir,
-                      **BTN_NEUTRAL).pack(side="left", padx=(8, 0))
-
-        ctk.CTkLabel(sec, text="Output defaults to same directory as input video.",
-                     font=ctk.CTkFont(size=11), text_color=("gray50", "gray55")
-                     ).pack(anchor="w", padx=14, pady=(4, 10))
-
-    # ── Parameters ────────────────────────────────────────────────────────────
-
-    def _build_sec_params(self, parent):
-        sec = self._section(parent, "2 · Detection Parameters")
-        sec.pack(fill="x", pady=(0, 12))
-
-        body = ctk.CTkFrame(sec, fg_color="transparent")
-        body.pack(fill="x", padx=14, pady=(10, 10))
-
-        params = [
-            ("Merge gap (s):",     self.gap_var,     1, 60,  "Max silence between song parts to merge"),
-            ("Min duration (s):",  self.min_dur_var,  5, 120, "Ignore segments shorter than this"),
-            ("Padding (s):",       self.padding_var,  0, 15,  "Extra seconds before/after each song"),
-            ("FPS:",               self.fps_var,      23, 60, "Video frame rate for timecodes"),
-        ]
-
-        for label_text, var, lo, hi, tooltip in params:
-            row = ctk.CTkFrame(body, fg_color="transparent")
-            row.pack(fill="x", pady=3)
-
-            ctk.CTkLabel(row, text=label_text, width=130, anchor="w",
-                         font=ctk.CTkFont(size=12)).pack(side="left")
-
-            slider = ctk.CTkSlider(row, from_=lo, to=hi, variable=var,
-                                    width=200, number_of_steps=max(1, hi - lo))
-            slider.pack(side="left", padx=(0, 8))
-
-            val_lbl = ctk.CTkLabel(row, text=f"{var.get():.1f}", width=50, anchor="w",
-                                    font=ctk.CTkFont(size=12, weight="bold"))
-            val_lbl.pack(side="left")
-
-            ctk.CTkLabel(row, text=tooltip, font=ctk.CTkFont(size=11),
-                         text_color=("gray50", "gray55")).pack(side="left", padx=(10, 0))
-
-            # Update label on slider move
-            var.trace_add("write", lambda *_, v=var, l=val_lbl: l.configure(text=f"{v.get():.1f}"))
-
-        # Auto-cut checkbox
-        ctk.CTkCheckBox(body, text="Generate auto-cut ffmpeg script (no DaVinci needed)",
-                        variable=self.autocut_var).pack(anchor="w", pady=(8, 0))
-
-    # ── Run ───────────────────────────────────────────────────────────────────
-
-    def _build_sec_run(self, parent):
-        sec = self._section(parent, "3 · Detect")
-        sec.pack(fill="x", pady=(0, 12))
-
-        body = ctk.CTkFrame(sec, fg_color="transparent")
-        body.pack(fill="x", padx=14, pady=(12, 6))
-
-        btn_row = ctk.CTkFrame(body, fg_color="transparent")
-        btn_row.pack(fill="x", pady=(0, 10))
-
-        self.detect_btn = ctk.CTkButton(
-            btn_row, text="🎤  Start Detection", width=230, height=42,
-            font=ctk.CTkFont(size=14, weight="bold"),
-            fg_color=ACCENT_GREEN["fg"], hover_color=ACCENT_GREEN["hover"],
-            command=self.start_detect)
-        self.detect_btn.pack(side="left")
-
-        self.stop_btn = ctk.CTkButton(
-            btn_row, text="■  Stop", width=106, height=42,
-            fg_color=("gray80", "gray25"), text_color=("gray10", "gray90"),
-            hover_color=("#FCA5A5", "#7F1D1D"),
-            command=self._stop, state="disabled")
-        self.stop_btn.pack(side="left", padx=(12, 0))
-
-        # Dependency warning
-        self.dep_lbl = ctk.CTkLabel(body, text="", font=ctk.CTkFont(size=11),
-                                     text_color="#F97316", wraplength=600, anchor="w", justify="left")
-        self.dep_lbl.pack(fill="x", pady=(0, 4))
-
-        # Progress
-        self.progress = ctk.CTkProgressBar(body, height=16, corner_radius=8, mode="indeterminate")
-        self.progress.pack(fill="x", pady=(0, 6))
-        self.progress.stop()
-        self.progress.set(0)
-
-        self.status_lbl = ctk.CTkLabel(body, text="", anchor="w", font=ctk.CTkFont(size=12))
-        self.status_lbl.pack(fill="x")
-
-        ctk.CTkFrame(sec, height=6, fg_color="transparent").pack()
-
-    # ── Results ───────────────────────────────────────────────────────────────
-
-    def _build_sec_results(self, parent):
-        sec = self._section(parent, "4 · Results")
-        sec.pack(fill="x", pady=(0, 14))
-
-        self.results_body = ctk.CTkFrame(sec, fg_color="transparent")
-        self.results_body.pack(fill="x", padx=14, pady=(10, 10))
-
-        self.results_lbl = ctk.CTkLabel(
-            self.results_body, text="No results yet. Run detection first.",
-            font=ctk.CTkFont(size=12), text_color=("gray50", "gray55"))
-        self.results_lbl.pack(anchor="w")
-
-        # Song list (populated after detection)
-        self.song_list_frame = ctk.CTkFrame(self.results_body, fg_color="transparent")
-
-        # Export buttons (hidden until results)
-        self.export_frame = ctk.CTkFrame(sec, fg_color="transparent")
-
-    # ══════════════════════════════════════════════════════════════════════════
-    #  Logic
-    # ══════════════════════════════════════════════════════════════════════════
-
-    def _check_deps(self):
-        available, msg = check_segmenter_available()
-        if not available:
-            self.dep_lbl.configure(text=f"⚠  {msg}")
-            self.detect_btn.configure(state="disabled")
-        else:
-            self.dep_lbl.configure(text="")
-
-        if not self.ffmpeg:
-            self.dep_lbl.configure(text="⚠  ffmpeg not found. Install ffmpeg and add to PATH.")
-            self.detect_btn.configure(state="disabled")
-
-    def _pick_input(self):
-        f = filedialog.askopenfilename(
-            title="Select video file",
-            filetypes=[("Video files", "*.mp4 *.mov *.mkv *.avi *.flv *.ts *.wmv *.m4v *.webm *.mts"),
-                       ("All files", "*.*")])
-        if f:
-            self.input_path_var.set(f)
-            if not self.output_dir_var.get().strip():
-                self.output_dir_var.set(str(Path(f).parent))
-
-    def _pick_output_dir(self):
-        d = filedialog.askdirectory(title="Choose output folder")
-        if d:
-            self.output_dir_var.set(d)
-
-    def _use_concat_output(self):
-        """Fill input from the Concat tab's output path."""
-        if hasattr(self.app, 'concat_tab'):
-            path = self.app.concat_tab.get_last_output_path()
-            if path and Path(path).exists():
-                self.input_path_var.set(path)
-                if not self.output_dir_var.get().strip():
-                    self.output_dir_var.set(str(Path(path).parent))
-                self._set_status(f"Loaded concat output: {Path(path).name}")
-            elif path:
-                self.input_path_var.set(path)
-                if not self.output_dir_var.get().strip():
-                    self.output_dir_var.set(str(Path(path).parent))
-                self._set_status("Concat output path set (file not yet created — run concat first)")
-            else:
-                messagebox.showinfo("No output", "Set an output path in the Concat tab first.")
-
-    def _set_status(self, text, error=False):
-        color = "#DC2626" if error else ("gray10", "gray90")
-        self.status_lbl.configure(text=text, text_color=color)
-
-    def _stop(self):
-        self._stop_req = True
-        self._set_status("Stopping…")
-
-    def start_detect(self):
-        """Start the detection pipeline in a background thread."""
-        input_path = self.input_path_var.get().strip()
-        if not input_path:
-            messagebox.showerror("No input", "Select a video file first.")
-            return
-        if not os.path.isfile(input_path):
-            messagebox.showerror("File not found", f"Cannot find:\n{input_path}")
-            return
-
-        available, msg = check_segmenter_available()
-        if not available:
-            messagebox.showerror("Missing dependency", msg)
-            return
-
-        self._running = True
-        self._stop_req = False
-        self.detect_btn.configure(state="disabled")
-        self.stop_btn.configure(state="normal")
-        self.progress.configure(mode="indeterminate")
-        self.progress.start()
-        self._set_status("Starting detection…")
-
-        threading.Thread(target=self._detect_worker, args=(input_path,), daemon=True).start()
-
-    def _detect_worker(self, input_path):
-        output_dir = self.output_dir_var.get().strip() or str(Path(input_path).parent)
-        os.makedirs(output_dir, exist_ok=True)
-        stem = Path(input_path).stem
-
-        wav_path = os.path.join(output_dir, f"{stem}_audio.wav")
-
-        try:
-            # Step 1: Extract audio
-            def progress_cb(msg):
-                self.app.after(0, lambda: self._set_status(msg))
-
-            extract_audio(input_path, wav_path, self.ffmpeg, progress_cb=progress_cb)
-
-            if self._stop_req:
-                self._cleanup_and_finish(wav_path, "Stopped by user.")
-                return
-
-            # Step 2: Run segmentation
-            self.app.after(0, lambda: self._set_status("Running audio segmentation (this may take a while)…"))
-            raw_segments = run_segmentation(wav_path, progress_cb=progress_cb)
-
-            if self._stop_req:
-                self._cleanup_and_finish(wav_path, "Stopped by user.")
-                return
-
-            self._raw_segments = raw_segments
-
-            # Step 3: Merge
-            self.app.after(0, lambda: self._set_status("Merging singing segments…"))
-            singing = merge_singing_segments(
-                raw_segments,
-                max_gap=self.gap_var.get(),
-                min_duration=self.min_dur_var.get(),
-                padding=self.padding_var.get(),
-            )
-            self._singing_segments = singing
-
-            # Step 4: Export
-            if singing:
-                fps = self.fps_var.get()
-                source_name = Path(input_path).name
-
-                edl_path = os.path.join(output_dir, f"{stem}_singing.edl")
-                csv_path = os.path.join(output_dir, f"{stem}_singing.csv")
-                markers_path = os.path.join(output_dir, f"{stem}_markers.csv")
-                json_path = os.path.join(output_dir, f"{stem}_singing.json")
-
-                export_edl(singing, edl_path, fps=fps,
-                          title=f"{stem} - Singing", source_filename=source_name)
-                export_csv(singing, csv_path)
-                export_markers_csv(singing, markers_path, fps=fps)
-                export_json(singing, json_path)
-
-                if self.autocut_var.get():
-                    export_ffmpeg_script(singing, input_path, output_dir)
-
-                total_singing = sum(s["duration"] for s in singing)
-                result_msg = (f"✓  Found {len(singing)} songs  ·  "
-                              f"Total singing: {format_timecode(total_singing)}  ·  "
-                              f"Exported to: {output_dir}")
-
-                self.app.after(0, lambda: self._show_results(singing, edl_path, output_dir))
-            else:
-                result_msg = "No singing segments detected. Try lowering min duration or increasing gap."
-
-            # Cleanup WAV
-            if os.path.exists(wav_path):
-                os.remove(wav_path)
-
-            self.app.after(0, lambda: self._set_status(result_msg))
-
-        except Exception as e:
-            self.app.after(0, lambda: self._set_status(f"Error: {e}", error=True))
-            if os.path.exists(wav_path):
-                try:
-                    os.remove(wav_path)
-                except Exception:
-                    pass
-
-        self.app.after(0, self._finish_detect)
-
-    def _cleanup_and_finish(self, wav_path, msg):
-        if os.path.exists(wav_path):
-            try:
-                os.remove(wav_path)
-            except Exception:
-                pass
-        self.app.after(0, lambda: self._set_status(msg))
-        self.app.after(0, self._finish_detect)
-
-    def _finish_detect(self):
-        self._running = False
-        self._stop_req = False
-        self.detect_btn.configure(state="normal")
-        self.stop_btn.configure(state="disabled")
-        self.progress.stop()
-        self.progress.configure(mode="determinate")
-        self.progress.set(1.0 if self._singing_segments else 0)
-
-    def _show_results(self, segments, edl_path, output_dir):
-        """Display detection results in the Results section."""
-        # Clear previous
-        for w in self.song_list_frame.winfo_children():
-            w.destroy()
-        self.export_frame.pack_forget()
-
-        self.results_lbl.configure(
-            text=f"Found {len(segments)} singing segments:",
-            text_color=("gray10", "gray90"))
-
-        self.song_list_frame.pack(fill="x", pady=(8, 0))
-
-        # Header
-        hdr = ctk.CTkFrame(self.song_list_frame, fg_color=("gray88", "gray20"), corner_radius=8)
-        hdr.pack(fill="x", pady=(0, 4))
-        for text, w in [("#", 40), ("Start", 90), ("End", 90), ("Duration", 80)]:
-            ctk.CTkLabel(hdr, text=text, width=w, anchor="center",
-                         font=ctk.CTkFont(size=11, weight="bold")).pack(side="left", padx=4, pady=4)
-
-        # Rows
-        for seg in segments:
-            row = ctk.CTkFrame(self.song_list_frame, corner_radius=6, height=30)
-            row.pack(fill="x", pady=2)
-            row.pack_propagate(False)
-
-            vals = [
-                (f"Song {seg['index']}", 40),
-                (format_timecode(seg["start"]), 90),
-                (format_timecode(seg["end"]), 90),
-                (f"{seg['duration']:.0f}s", 80),
-            ]
-            for text, w in vals:
-                ctk.CTkLabel(row, text=text, width=w, anchor="center",
-                             font=ctk.CTkFont(size=11)).pack(side="left", padx=4)
-
-        # Total
-        total = sum(s["duration"] for s in segments)
-        ctk.CTkLabel(self.song_list_frame,
-                     text=f"Total singing time: {format_timecode(total)}",
-                     font=ctk.CTkFont(size=12, weight="bold")).pack(anchor="w", pady=(8, 0))
-
-        # Export info
-        self.export_frame.pack(fill="x", padx=14, pady=(4, 10))
-        for w in self.export_frame.winfo_children():
-            w.destroy()
-
-        ctk.CTkLabel(self.export_frame,
-                     text=f"Files exported to: {output_dir}",
-                     font=ctk.CTkFont(size=11), text_color=("gray45", "gray55"),
-                     wraplength=600, anchor="w", justify="left").pack(anchor="w")
-
-        info_lines = [
-            "• _singing.edl  →  DaVinci Resolve: File → Import → Timeline",
-            "• _markers.csv  →  DaVinci Resolve: Timeline → Import Markers from CSV",
-            "• _singing.csv  →  Human-readable segment list",
-            "• _singing.json →  Programmatic use",
-        ]
-        if self.autocut_var.get():
-            info_lines.append("• _autocut.bat  →  Run to auto-cut singing segments (no DaVinci needed)")
-
-        for line in info_lines:
-            ctk.CTkLabel(self.export_frame, text=line,
-                         font=ctk.CTkFont(size=11),
-                         text_color=("gray50", "gray55"), anchor="w").pack(anchor="w")
-
-    # ── Public API for Quick Flow ─────────────────────────────────────────────
-
-    def run_detect_headless(self, input_path: str, output_dir: str,
-                            gap: float, min_dur: float, padding: float,
-                            fps: float, autocut: bool,
-                            progress_cb=None) -> list:
-        """
-        Run detection synchronously (called from Quick Flow worker thread).
-        Returns list of singing segments.
-        """
-        os.makedirs(output_dir, exist_ok=True)
-        stem = Path(input_path).stem
-        wav_path = os.path.join(output_dir, f"{stem}_audio.wav")
-
-        try:
-            extract_audio(input_path, wav_path, self.ffmpeg, progress_cb=progress_cb)
-
-            raw_segments = run_segmentation(wav_path, progress_cb=progress_cb)
-
-            if progress_cb:
-                progress_cb("Merging singing segments…")
-
-            singing = merge_singing_segments(raw_segments,
-                                             max_gap=gap, min_duration=min_dur, padding=padding)
-
-            if singing:
-                source_name = Path(input_path).name
-                export_edl(singing, os.path.join(output_dir, f"{stem}_singing.edl"),
-                          fps=fps, title=f"{stem} - Singing", source_filename=source_name)
-                export_csv(singing, os.path.join(output_dir, f"{stem}_singing.csv"))
-                export_markers_csv(singing, os.path.join(output_dir, f"{stem}_markers.csv"), fps=fps)
-                export_json(singing, os.path.join(output_dir, f"{stem}_singing.json"))
-                if autocut:
-                    export_ffmpeg_script(singing, input_path, output_dir)
-
-            if os.path.exists(wav_path):
-                os.remove(wav_path)
-
-            return singing
-
-        except Exception:
-            if os.path.exists(wav_path):
-                try:
-                    os.remove(wav_path)
-                except Exception:
-                    pass
-            raise
diff --git a/ui/theme.py b/ui/theme.py
deleted file mode 100644
index f317f0b..0000000
--- a/ui/theme.py
+++ /dev/null
@@ -1,64 +0,0 @@
-"""
-Theme, DPI, and shared styling constants.
-"""
-
-import sys
-
-# ── DPI awareness (call before any Tk/CTk window) ────────────────────────────
-def setup_dpi():
-    if sys.platform == "win32":
-        try:
-            import ctypes
-            ctypes.windll.shcore.SetProcessDpiAwareness(2)
-        except Exception:
-            try:
-                import ctypes
-                ctypes.windll.user32.SetProcessDPIAware()
-            except Exception:
-                pass
-
-
-def dpi_scale(widget) -> float:
-    try:
-        return max(1.0, widget.winfo_fpixels("1i") / 96.0)
-    except Exception:
-        return 1.0
-
-
-# ── Color accents ─────────────────────────────────────────────────────────────
-# Each feature area has its own accent color scheme: (light_mode, dark_mode)
-
-ACCENT_BLUE = {
-    "fg":    ("#3B82F6", "#2563EB"),
-    "hover": ("#2563EB", "#1D4ED8"),
-}
-
-ACCENT_PURPLE = {
-    "fg":       ("#EDE9FE", "#3B1F6E"),
-    "text":     ("#5B21B6", "#C4B5FD"),
-    "hover":    ("#DDD6FE", "#4C2889"),
-    "preview":  ("#7C3AED", "#A78BFA"),
-}
-
-ACCENT_GREEN = {
-    "fg":    ("#10B981", "#059669"),
-    "hover": ("#059669", "#047857"),
-}
-
-ACCENT_AMBER = {
-    "fg":    ("#F59E0B", "#D97706"),
-    "hover": ("#D97706", "#B45309"),
-}
-
-# Neutral button style
-BTN_NEUTRAL = {
-    "fg_color":    ("gray80", "gray25"),
-    "text_color":  ("gray10", "gray90"),
-    "hover_color": ("gray70", "gray35"),
-}
-
-BTN_SIDE = {
-    "fg_color":    ("gray82", "gray22"),
-    "text_color":  ("gray10", "gray90"),
-    "hover_color": ("gray72", "gray32"),
-}
diff --git a/utils/formats.py b/utils/formats.py
deleted file mode 100644
index a5edc59..0000000
--- a/utils/formats.py
+++ /dev/null
@@ -1,42 +0,0 @@
-"""
-Timecode & duration formatting utilities.
-"""
-
-
-def fmt_dur(seconds: float) -> str:
-    """Format a duration as H:MM:SS or M:SS for display."""
-    if seconds < 0:
-        return "…"
-    if seconds == 0:
-        return "—"
-    s = int(round(seconds))
-    h, rem = divmod(s, 3600)
-    m, sec = divmod(rem, 60)
-    return f"{h}:{m:02d}:{sec:02d}" if h else f"{m}:{sec:02d}"
-
-
-def fmt_elapsed(s: float) -> str:
-    if s < 60:
-        return f"{int(s)}s"
-    m, sec = divmod(int(s), 60)
-    return f"{m}m {sec:02d}s"
-
-
-def format_timecode(seconds: float) -> str:
-    """Format seconds as HH:MM:SS."""
-    h = int(seconds // 3600)
-    m = int((seconds % 3600) // 60)
-    s = int(seconds % 60)
-    return f"{h:02d}:{m:02d}:{s:02d}"
-
-
-def seconds_to_smpte(seconds: float, fps: float = 29.97) -> str:
-    """Convert seconds to SMPTE timecode HH:MM:SS:FF."""
-    total_frames = int(seconds * fps)
-    ff = total_frames % int(round(fps))
-    total_seconds = total_frames // int(round(fps))
-    ss = total_seconds % 60
-    total_minutes = total_seconds // 60
-    mm = total_minutes % 60
-    hh = total_minutes // 60
-    return f"{hh:02d}:{mm:02d}:{ss:02d}:{ff:02d}"