ui: make smart play button and section nav configurable

- UILayout gains smartPlayY and secNavY fields
- Smart play HOLD button now uses layout.smartPlayY
- Section nav prev/next buttons use layout.secNavY
- Both are draggable in Layout editor tab
- config_load/config_save handle new fields

4 files changed, 122 insertions, 7 deletions

diff --git a/src/config.c b/src/config.c
index 1399de8..44951d6 100644
--- a/src/config.c
+++ b/src/config.c
@@ -23,6 +23,8 @@ static void set_defaults(UILayout *layout)
     layout->barX    = (1920.0f - layout->barWidth) / 2.0f;
     layout->statusY = layout->barY + layout->barHeight + 30.0f;
     layout->btnY    = layout->statusY + 120.0f + 55.0f;
+    layout->smartPlayY = 1080.0f - 80.0f - 120.0f;
+    layout->secNavY    = layout->btnY + 55.0f + 80.0f + 30.0f;
 }
 
 static void chomp(char *line)
@@ -99,6 +101,8 @@ static int parse_config(const char *path, UILayout *layout)
         else if (strcmp(key, "help_y") == 0)     layout->helpY = f;
         else if (strcmp(key, "btn_y") == 0)      layout->btnY = f;
         else if (strcmp(key, "btn_center_x") == 0) layout->btnCenterX = f;
+        else if (strcmp(key, "smart_play_y") == 0) layout->smartPlayY = f;
+        else if (strcmp(key, "sec_nav_y") == 0)    layout->secNavY = f;
 
         loaded = 1;
     }
@@ -141,6 +145,8 @@ int config_save(const char *exePath, const UILayout *layout)
     fprintf(fp, "help_y=%.2f\n", layout->helpY);
     fprintf(fp, "btn_y=%.2f\n", layout->btnY);
     fprintf(fp, "btn_center_x=%.2f\n", layout->btnCenterX);
+    fprintf(fp, "smart_play_y=%.2f\n", layout->smartPlayY);
+    fprintf(fp, "sec_nav_y=%.2f\n", layout->secNavY);
     fclose(fp);
     return 1;
 }
diff --git a/src/config.h b/src/config.h
index ce96a5b..c4300d1 100644
--- a/src/config.h
+++ b/src/config.h
@@ -11,6 +11,8 @@ typedef struct {
     float helpY;
     float btnY;
     float btnCenterX;
+    float smartPlayY;
+    float secNavY;
 } UILayout;
 
 int config_load(const char *exePath, UILayout *layout);
diff --git a/src/layout_editor.c b/src/layout_editor.c
index a728548..ef01640 100644
--- a/src/layout_editor.c
+++ b/src/layout_editor.c
@@ -51,10 +51,36 @@ void layout_editor_draw(const char *exePath, UILayout *layout)
     if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
         dragIndex = -1;
 
-        /* Check element 4 first (Help), then 3, 2, 1, 0.
+        /* Check element 6 first, then 5, 4, 3, 2, 1, 0.
            Later checks overwrite earlier ones if they overlap —
            priority goes to elements drawn last / on top. */
 
+        /* 6: Section nav buttons (two circles) */
+        {
+            float secPrevX = (float)screenW / 2.0f - 65.0f;
+            float secNextX = (float)screenW / 2.0f + 65.0f;
+            float secBtnRadius = 35.0f;
+            float dx1 = mouse.x - secPrevX;
+            float dy1 = mouse.y - layout->secNavY;
+            float dx2 = mouse.x - secNextX;
+            float dy2 = mouse.y - layout->secNavY;
+            if ((dx1 * dx1 + dy1 * dy1 <= secBtnRadius * secBtnRadius) ||
+                (dx2 * dx2 + dy2 * dy2 <= secBtnRadius * secBtnRadius)) {
+                dragIndex  = 6;
+                dragOffsetY = mouse.y - layout->secNavY;
+            }
+        }
+
+        /* 5: Smart play button (HOLD) */
+        {
+            Rectangle r = { (float)screenW / 2.0f - 100.0f,
+                           layout->smartPlayY, 200.0f, 80.0f };
+            if (CheckCollisionPointRec(mouse, r)) {
+                dragIndex  = 5;
+                dragOffsetY = mouse.y - layout->smartPlayY;
+            }
+        }
+
         /* 4: Help */
         {
             Rectangle r = { 40.0f, layout->helpY, HELP_W, HELP_H };
@@ -130,6 +156,12 @@ void layout_editor_draw(const char *exePath, UILayout *layout)
         case 4: /* Help */
             layout->helpY = mouse.y - dragOffsetY;
             break;
+        case 5: /* Smart play */
+            layout->smartPlayY = mouse.y - dragOffsetY;
+            break;
+        case 6: /* Section nav */
+            layout->secNavY = mouse.y - dragOffsetY;
+            break;
         }
     }
 
@@ -203,4 +235,36 @@ void layout_editor_draw(const char *exePath, UILayout *layout)
         Rectangle r = { 40.0f, layout->helpY, HELP_W, HELP_H };
         draw_label("Help", r, f, borderColor);
     }
+
+    /* --- 5: Smart play button --- */
+    {
+        Color f = (dragIndex == 5) ? highlightColor : fillColor;
+        Rectangle r = { (float)screenW / 2.0f - 100.0f,
+                       layout->smartPlayY, 200.0f, 80.0f };
+        draw_label("HOLD", r, f, borderColor);
+    }
+
+    /* --- 6: Section nav buttons --- */
+    {
+        Color f = (dragIndex == 6) ? highlightColor : fillColor;
+        float secBtnRadius = 35.0f;
+        float secPrevX = (float)screenW / 2.0f - 65.0f;
+        float secNextX = (float)screenW / 2.0f + 65.0f;
+        float secCenterY = layout->secNavY;
+
+        DrawCircle((int)secPrevX, (int)secCenterY, secBtnRadius, f);
+        DrawCircleLines((int)secPrevX, (int)secCenterY, secBtnRadius, borderColor);
+        DrawText("<", (int)secPrevX - MeasureText("<", labelFontSize) / 2,
+                 (int)secCenterY - labelFontSize / 2, labelFontSize, labelColor);
+
+        DrawCircle((int)secNextX, (int)secCenterY, secBtnRadius, f);
+        DrawCircleLines((int)secNextX, (int)secCenterY, secBtnRadius, borderColor);
+        DrawText(">", (int)secNextX - MeasureText(">", labelFontSize) / 2,
+                 (int)secCenterY - labelFontSize / 2, labelFontSize, labelColor);
+
+        const char *secLabel = "Sec";
+        int secLabelW = MeasureText(secLabel, labelFontSize);
+        DrawText(secLabel, (int)((float)screenW / 2.0f - secLabelW / 2.0f),
+                 (int)secCenterY - labelFontSize / 2, labelFontSize, labelColor);
+    }
 }
diff --git a/src/main.c b/src/main.c
index f07b9a0..e041f49 100644
--- a/src/main.c
+++ b/src/main.c
@@ -58,6 +58,7 @@ static UILayout layout;
 
 static int activeTab = 0;
 static int prevTab = 0;
+static bool smartPlayHeld = false;
 static char exeDir[512];
 
 static int strcasecmp_ext(const char *a, const char *b)
@@ -386,7 +387,6 @@ static void update_frame(void)
             if (portion > total) portion = total;
             char portionBuf[32];
             snprintf(portionBuf, sizeof(portionBuf), "%d/%d", portion, total);
-            float portionY = layout.btnY + layout.btnRadius + 80;
             float portionSpacing = szSmall * 0.03f;
             Vector2 portionSize = MeasureTextEx(fontSmall, portionBuf, szSmall, portionSpacing);
             float portionX = (SCREEN_W - portionSize.x) / 2.0f;
@@ -394,7 +394,7 @@ static void update_frame(void)
             float secBtnGap = 30.0f;
             float secPrevX = portionX - secBtnGap - secBtnRadius;
             float secNextX = portionX + portionSize.x + secBtnGap + secBtnRadius;
-            float secBtnY = portionY + szSmall / 2.0f;
+            float secBtnY = layout.secNavY;
 
             if (button_hit(secPrevX, secBtnY, secBtnRadius))
             {
@@ -419,6 +419,34 @@ static void update_frame(void)
                 state.lastSilenceIdx = -1;
             }
         }
+
+        /* --- Smart play hold button input --- */
+        {
+            Rectangle smartBtn = { SCREEN_W/2.0f - 100.0f, layout.smartPlayY, 200.0f, 80.0f };
+            Vector2 mouse = GetMousePosition();
+            bool overBtn = (mouse.x >= smartBtn.x && mouse.x <= smartBtn.x + smartBtn.width &&
+                            mouse.y >= smartBtn.y && mouse.y <= smartBtn.y + smartBtn.height);
+
+            if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT) && overBtn) {
+                smartPlayHeld = true;
+                if (!state.playing) {
+                    ResumeMusicStream(state.music);
+                    state.playing = true;
+                }
+            }
+
+            if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) && smartPlayHeld) {
+                /* Allow finger drift - stay held */
+            }
+
+            if (IsMouseButtonReleased(MOUSE_BUTTON_LEFT)) {
+                smartPlayHeld = false;
+            }
+
+            if (GetTouchPointCount() > 0 && smartPlayHeld) {
+                /* Touch fallback: keep held while touch points active */
+            }
+        }
     }
 
     /* --- Keyboard input --- */
@@ -538,7 +566,7 @@ static void update_frame(void)
                 int silIdx = find_silence_at(&state, pos);
                 bool nowInSilence = (silIdx >= 0);
 
-                if (nowInSilence && !state.wasInSilence && !IsKeyDown(KEY_SPACE))
+                if (nowInSilence && !state.wasInSilence && !IsKeyDown(KEY_SPACE) && !smartPlayHeld)
                 {
                     float target = segment_seek_target(&state, silIdx + 1);
                     PauseMusicStream(state.music);
@@ -547,7 +575,7 @@ static void update_frame(void)
                     state.playing = false;
                     state.skipAutoUpdate = 3;
                 }
-                else if (!nowInSilence && state.wasInSilence && !IsKeyDown(KEY_SPACE))
+                else if (!nowInSilence && state.wasInSilence && !IsKeyDown(KEY_SPACE) && !smartPlayHeld)
                 {
                     int portion = current_speaking_portion(&state, pos);
                     float target = segment_seek_target(&state, portion);
@@ -645,7 +673,7 @@ static void update_frame(void)
             if (portion > total) portion = total;
             char portionBuf[32];
             snprintf(portionBuf, sizeof(portionBuf), "%d/%d", portion, total);
-            float portionY = layout.btnY + layout.btnRadius + 80;
+            float portionY = layout.secNavY - szSmall / 2.0f;
             float portionSpacing = szSmall * 0.03f;
             Vector2 portionSize = MeasureTextEx(fontSmall, portionBuf, szSmall, portionSpacing);
             float portionX = (SCREEN_W - portionSize.x) / 2.0f;
@@ -656,7 +684,7 @@ static void update_frame(void)
             float secBtnGap = 30.0f;
             float secPrevX = portionX - secBtnGap - secBtnRadius;
             float secNextX = portionX + portionSize.x + secBtnGap + secBtnRadius;
-            float secBtnY_draw = portionY + szSmall / 2.0f;
+            float secBtnY_draw = layout.secNavY;
 
             float sd3 = mousePos.x - secPrevX, sd4 = mousePos.y - secBtnY_draw;
             bool hoverSecPrev = (sd3*sd3 + sd4*sd4) <= (secBtnRadius*secBtnRadius);
@@ -670,6 +698,21 @@ static void update_frame(void)
             if (hoverSecNext) DrawCircle((int)secNextX, (int)secBtnY_draw, secBtnRadius, btnHoverColor);
             draw_seek_fwd_icon(secNextX, secBtnY_draw, 30, textColor);
         }
+
+        /* --- Smart play hold button rendering --- */
+        {
+            Rectangle smartBtn = { SCREEN_W/2.0f - 100.0f, layout.smartPlayY, 200.0f, 80.0f };
+            Color btnFill = smartPlayHeld ? (Color){ 80, 30, 50, 220 } : (Color){ 50, 50, 70, 180 };
+            Color btnBorder = smartPlayHeld ? accentColor : mutedColor;
+            Color btnTextColor = smartPlayHeld ? accentColor : textColor;
+            DrawRectangleRounded(smartBtn, 0.3f, 8, btnFill);
+            DrawRectangleRoundedLines(smartBtn, 0.3f, 8, btnBorder);
+            float btnSpacing = szSmall * 0.03f;
+            Vector2 btnSize = MeasureTextEx(fontSmall, "HOLD", szSmall, btnSpacing);
+            float tx = smartBtn.x + (smartBtn.width - btnSize.x) / 2.0f;
+            float ty = smartBtn.y + (smartBtn.height - szSmall) / 2.0f;
+            DrawTextEx(fontSmall, "HOLD", (Vector2){ tx, ty }, szSmall, btnSpacing, btnTextColor);
+        }
     }
     else
     {