terminal is fixed and im not happy about it

src/glyph_shader.wgsl

@@ -459,11 +459,16 @@ fn vs_cell_bg(
     
     // For default background (type 0), use fully transparent so the window's
     // clear color (which has background_opacity applied) shows through.
+    // UNLESS the grid params specify an opaque background (e.g. alternate screen).
     // Only non-default backgrounds should be opaque.
     // But NOT if the cell is selected (selection always has white bg)
     let bg_type = cell.bg & 0xFFu;
     if bg_type == COLOR_TYPE_DEFAULT && !is_reverse && !is_selected {
-        bg.a = 0.0;
+        if grid_params.background_opacity < 1.0 {
+            bg.a = 0.0;
+        } else {
+            bg.a = 1.0;
+        }
     }
     
     // Calculate cursor color

src/main.rs

@@ -879,7 +879,7 @@ fn remove_pid_file() {
 /// - Last segment is bold
 /// - Section has a dark gray background color (#282828)
 /// - Section ends with powerline arrow transition
-fn build_cwd_section(cwd: &str) -> StatuslineSection {
+fn build_cwd_section(cwd: &str, is_light: bool) -> StatuslineSection {
     // Colors to cycle through (skip 0 and 1 which are often near-white in custom schemes)
     const COLORS: [u8; 6] = [2, 3, 4, 5, 6, 7];
 
@@ -903,7 +903,12 @@ fn build_cwd_section(cwd: &str) -> StatuslineSection {
     if segments.is_empty() {
         // Root directory
         components.push(StatuslineComponent::new(" \u{F07C} / ").fg(COLORS[0]));
-        return StatuslineSection::with_rgb_bg(0x28, 0x28, 0x28)
+        let (bg_r, bg_g, bg_b) = if is_light {
+            (0xE0, 0xE0, 0xE0)
+        } else {
+            (0x28, 0x28, 0x28)
+        };
+        return StatuslineSection::with_rgb_bg(bg_r, bg_g, bg_b)
             .with_components(components);
     }
 
@@ -940,8 +945,12 @@ fn build_cwd_section(cwd: &str) -> StatuslineSection {
     // Add trailing space for padding before the powerline arrow
     components.push(StatuslineComponent::new(" "));
 
-    // Use dark gray (#282828) as section background
+    let (bg_r, bg_g, bg_b) = if is_light {
-    StatuslineSection::with_rgb_bg(0x28, 0x28, 0x28).with_components(components)
+        (0xE0, 0xE0, 0xE0)
+    } else {
+        (0x28, 0x28, 0x28)
+    };
+    StatuslineSection::with_rgb_bg(bg_r, bg_g, bg_b).with_components(components)
 }
 
 /// Git repository status information.
@@ -1101,7 +1110,7 @@ fn get_git_status(cwd: &str) -> Option<GitStatus> {
 
 /// Build a statusline section for git status.
 /// Returns None if not in a git repository.
-fn build_git_section(cwd: &str) -> Option<StatuslineSection> {
+fn build_git_section(cwd: &str, is_light: bool) -> Option<StatuslineSection> {
     let status = get_git_status(cwd)?;
 
     // Determine foreground color based on state (matching oh-my-posh template)
@@ -1111,13 +1120,29 @@ fn build_git_section(cwd: &str) -> Option<StatuslineSection> {
     // 3. If both ahead and behind: #ff4500 (red-orange)
     // 4. If ahead or behind: #B388FF (purple)
     let fg_color: (u8, u8, u8) = if status.ahead > 0 && status.behind > 0 {
-        (0xff, 0x45, 0x00) // #ff4500 - red-orange
+        if is_light {
+            (0xCC, 0x37, 0x00)
+        } else {
+            (0xff, 0x45, 0x00)
+        } // red-orange (darker for light mode)
     } else if status.ahead > 0 || status.behind > 0 {
-        (0xB3, 0x88, 0xFF) // #B388FF - purple
+        if is_light {
+            (0x7B, 0x4C, 0xCC)
+        } else {
+            (0xB3, 0x88, 0xFF)
+        } // purple (darker for light mode)
     } else if status.working_changed > 0 || status.staging_changed > 0 {
-        (0xFF, 0x92, 0x48) // #FF9248 - orange
+        if is_light {
+            (0xC0, 0x60, 0x10)
+        } else {
+            (0xFF, 0x92, 0x48)
+        } // orange (darker for light mode)
     } else {
-        (0x0d, 0xa3, 0x00) // #0da300 - green
+        if is_light {
+            (0x0A, 0x7D, 0x00)
+        } else {
+            (0x0d, 0xa3, 0x00)
+        } // green (darker for light mode)
     };
 
     let mut components = Vec::new();
@@ -1192,9 +1217,15 @@ fn build_git_section(cwd: &str) -> Option<StatuslineSection> {
             .rgb_fg(fg_color.0, fg_color.1, fg_color.2),
     );
 
-    // Background: #232323
+    // Background
+    let (bg_r, bg_g, bg_b) = if is_light {
+        (0xD0, 0xD0, 0xD0) // Light mode background
+    } else {
+        (0x23, 0x23, 0x23) // Dark mode background
+    };
+
     Some(
-        StatuslineSection::with_rgb_bg(0x23, 0x23, 0x23)
+        StatuslineSection::with_rgb_bg(bg_r, bg_g, bg_b)
             .with_components(components),
     )
 }
@@ -1293,6 +1324,8 @@ struct App {
     shutdown: Arc<AtomicBool>,
     /// Current mouse cursor position.
     cursor_position: PhysicalPosition<f64>,
+    /// Where the mouse was last pressed (for drag selection threshold).
+    mouse_down_pos: Option<PhysicalPosition<f64>>,
     /// Frame counter for FPS logging.
     frame_count: u64,
     /// Last time we logged FPS.
@@ -1345,6 +1378,7 @@ impl App {
             event_loop_proxy: None,
             shutdown: Arc::new(AtomicBool::new(false)),
             cursor_position: PhysicalPosition::new(0.0, 0.0),
+            mouse_down_pos: None,
             frame_count: 0,
             last_frame_log: std::time::Instant::now(),
             should_create_window: false,
@@ -2019,8 +2053,12 @@ impl App {
                         if let Some(ref custom) = pane.custom_statusline {
                             StatuslineContent::Raw(custom.clone())
                         } else if let Some(cwd) = pane.pty.foreground_cwd() {
-                            let mut sections = vec![build_cwd_section(&cwd)];
+                            let is_light = pane.terminal.palette.is_light();
-                            if let Some(git_section) = build_git_section(&cwd) {
+                            let mut sections =
+                                vec![build_cwd_section(&cwd, is_light)];
+                            if let Some(git_section) =
+                                build_git_section(&cwd, is_light)
+                            {
                                 sections.push(git_section);
                             }
                             StatuslineContent::Sections(sections)
@@ -2980,6 +3018,63 @@ impl ApplicationHandler<UserEvent> for App {
                             }
                         }
                     }
+                } else if let Some(down_pos) = self.mouse_down_pos {
+                    if !self.has_mouse_tracking() {
+                        let dx = position.x - down_pos.x;
+                        let dy = position.y - down_pos.y;
+                        let distance_sq = dx * dx + dy * dy;
+
+                        let cell_width = self
+                            .renderer
+                            .as_ref()
+                            .map(|r| r.cell_metrics.cell_width as f64)
+                            .unwrap_or(8.0);
+                        let threshold = cell_width * 0.5;
+
+                        if distance_sq > threshold * threshold {
+                            // Dragged far enough, start selection
+                            if let Some(renderer) = &self.renderer {
+                                if let Some((start_col, start_screen_row)) =
+                                    renderer
+                                        .pixel_to_cell(down_pos.x, down_pos.y)
+                                {
+                                    if let Some((end_col, end_screen_row)) =
+                                        renderer.pixel_to_cell(
+                                            position.x, position.y,
+                                        )
+                                    {
+                                        let scroll_offset =
+                                            self.get_scroll_offset() as isize;
+                                        let start_pos = CellPosition {
+                                            col: start_col,
+                                            row: start_screen_row as isize
+                                                - scroll_offset,
+                                        };
+                                        let end_pos = CellPosition {
+                                            col: end_col,
+                                            row: end_screen_row as isize
+                                                - scroll_offset,
+                                        };
+
+                                        if let Some(tab) = self.active_tab_mut()
+                                        {
+                                            if let Some(pane) =
+                                                tab.active_pane_mut()
+                                            {
+                                                pane.selection =
+                                                    Some(Selection {
+                                                        start: start_pos,
+                                                        end: end_pos,
+                                                    });
+                                                pane.is_selecting = true;
+                                                self.request_redraw();
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
                 }
             }
 
@@ -3022,37 +3117,16 @@ impl ApplicationHandler<UserEvent> for App {
                 } else if button == MouseButton::Left {
                     match state {
                         ElementState::Pressed => {
-                            if let Some(renderer) = &self.renderer {
+                            self.mouse_down_pos = Some(self.cursor_position);
-                                if let Some((col, screen_row)) = renderer
+                            if let Some(tab) = self.active_tab_mut() {
-                                    .pixel_to_cell(
+                                if let Some(pane) = tab.active_pane_mut() {
-                                        self.cursor_position.x,
+                                    pane.selection = None;
-                                        self.cursor_position.y,
+                                    pane.is_selecting = false;
-                                    )
-                                {
-                                    let scroll_offset =
-                                        self.get_scroll_offset();
-                                    let content_row = screen_row as isize
-                                        - scroll_offset as isize;
-                                    let pos = CellPosition {
-                                        col,
-                                        row: content_row,
-                                    };
-                                    log::debug!("Selection started at col={}, content_row={}, screen_row={}, scroll_offset={}", col, content_row, screen_row, scroll_offset);
-                                    if let Some(tab) = self.active_tab_mut() {
-                                        if let Some(pane) =
-                                            tab.active_pane_mut()
-                                        {
-                                            pane.selection = Some(Selection {
-                                                start: pos,
-                                                end: pos,
-                                            });
-                                            pane.is_selecting = true;
-                                        }
-                                    }
                                 }
                             }
                         }
                         ElementState::Released => {
+                            self.mouse_down_pos = None;
                             let was_selecting = self
                                 .active_pane()
                                 .map(|p| p.is_selecting)

src/renderer.rs

@@ -2406,14 +2406,19 @@ impl Renderer {
 
     /// Parse ANSI escape sequences from raw statusline content.
     /// Returns a vector of (char, fg_color, bg_color, bold) tuples.
-    fn parse_ansi_statusline(content: &str) -> Vec<(char, StatuslineColor, StatuslineColor, bool)> {
+    fn parse_ansi_statusline(content: &str, is_light: bool) -> Vec<(char, StatuslineColor, StatuslineColor, bool)> {
         let mut result = Vec::new();
         let chars: Vec<char> = content.chars().collect();
         let mut i = 0;
         
         // Current styling state
         let mut fg = StatuslineColor::Default;
-        let mut bg = StatuslineColor::Rgb(0x1a, 0x1a, 0x1a); // Default statusline background
+        let default_bg_color = if is_light {
+            StatuslineColor::Rgb(0xD0, 0xD0, 0xD0)
+        } else {
+            StatuslineColor::Rgb(0x1a, 0x1a, 0x1a)
+        };
+        let mut bg = default_bg_color.clone(); // Default statusline background
         let mut bold = false;
         
         while i < chars.len() {
@@ -2494,7 +2499,7 @@ impl Renderer {
                                         }
                                     }
                                 }
-                                49 => bg = StatuslineColor::Rgb(0x1a, 0x1a, 0x1a), // Reset to default statusline bg
+                                49 => bg = default_bg_color.clone(), // Reset to default statusline bg
                                 90..=97 => fg = StatuslineColor::Indexed((code - 90 + 8) as u8),
                                 100..=107 => bg = StatuslineColor::Indexed((code - 100 + 8) as u8),
                                 _ => {}
@@ -2528,7 +2533,7 @@ impl Renderer {
     /// this is used to expand the middle gap to fill the full window width.
     /// 
     /// Returns the number of columns used.
-    fn update_statusline_cells(&mut self, content: &StatuslineContent, target_width: f32) -> usize {
+    fn update_statusline_cells(&mut self, content: &StatuslineContent, target_width: f32, is_light: bool) -> usize {
         self.statusline_gpu_cells.clear();
         
         // Calculate target columns based on window width
@@ -2540,14 +2545,19 @@ impl Renderer {
             self.statusline_max_cols
         };
         
-        // Default background color for statusline (dark gray)
+        // Default background color for statusline
-        let default_bg = Self::pack_statusline_color(StatuslineColor::Rgb(0x1a, 0x1a, 0x1a));
+        let default_bg_color = if is_light {
+            StatuslineColor::Rgb(0xD0, 0xD0, 0xD0)
+        } else {
+            StatuslineColor::Rgb(0x1a, 0x1a, 0x1a)
+        };
+        let default_bg = Self::pack_statusline_color(default_bg_color);
         let _ = default_bg; // Silence unused warning - used by Sections path
         
         match content {
             StatuslineContent::Raw(ansi_content) => {
                 // Parse ANSI escape sequences to extract colors and text
-                let parsed = Self::parse_ansi_statusline(ansi_content);
+                let parsed = Self::parse_ansi_statusline(ansi_content, is_light);
                 
                 // Find the middle gap (largest consecutive run of spaces)
                 // and expand it to fill the target width
@@ -2597,7 +2607,7 @@ impl Renderer {
                     let gap_bg = if best_gap_len > 0 && best_gap_start < parsed.len() {
                         parsed[best_gap_start].2
                     } else {
-                        StatuslineColor::Rgb(0x1a, 0x1a, 0x1a)
+                        default_bg_color.clone()
                     };
                     
                     // The position right before right-hand content starts (end of gap)
@@ -2845,7 +2855,7 @@ impl Renderer {
         
         // Fill remaining width with default background cells
         // This ensures the statusline covers the entire window width
-        let default_bg_packed = Self::pack_statusline_color(StatuslineColor::Default);
+        let default_bg_packed = default_bg;
         while self.statusline_gpu_cells.len() < target_cols && self.statusline_gpu_cells.len() < self.statusline_max_cols {
             self.statusline_gpu_cells.push(GPUCell {
                 fg: 0,
@@ -4331,10 +4341,17 @@ impl Renderer {
                 TabBarPosition::Hidden => unreachable!(),
             };
 
-            // Use same color as statusline: 0x1a1a1a (26, 26, 26) in sRGB
+            let is_light = self.palette.is_light();
-            // Pre-computed linear RGB value for srgb_to_linear(26/255) ≈ 0.00972
+            let tab_bar_bg = if is_light {
-            const TAB_BAR_BG_LINEAR: f32 = 0.00972;
+                // Light mode statusline bg is approx 0xD0, linear is ~0.63076
-            let tab_bar_bg = [TAB_BAR_BG_LINEAR, TAB_BAR_BG_LINEAR, TAB_BAR_BG_LINEAR, 1.0];
+                const TAB_BAR_BG_LINEAR_LIGHT: f32 = 0.63076;
+                [TAB_BAR_BG_LINEAR_LIGHT, TAB_BAR_BG_LINEAR_LIGHT, TAB_BAR_BG_LINEAR_LIGHT, 1.0]
+            } else {
+                // Use same color as statusline: 0x1a1a1a (26, 26, 26) in sRGB
+                // Pre-computed linear RGB value for srgb_to_linear(26/255) ≈ 0.00972
+                const TAB_BAR_BG_LINEAR_DARK: f32 = 0.00972;
+                [TAB_BAR_BG_LINEAR_DARK, TAB_BAR_BG_LINEAR_DARK, TAB_BAR_BG_LINEAR_DARK, 1.0]
+            };
 
             // Draw tab bar background
             log::debug!("render_panes: drawing tab bar at y={}, height={}, num_tabs={}, quads_before={}", 
@@ -4354,23 +4371,23 @@ impl Renderer {
                 let tab_width = title_width.max(min_tab_width);
 
                 let tab_bg = if is_active {
-                    // Active tab: brightest - significantly brighter than tab bar
+                    // Active tab: brightest - matches terminal background or slightly brighter
                     let [r, g, b] = self.palette.default_bg;
-                    let boost = 50.0_f32; // More visible for active tab
+                    let boost = if is_light { 0.0_f32 } else { 50.0_f32 };
                     [
-                        Self::srgb_to_linear((r as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((r as f32 + boost).clamp(0.0, 255.0) / 255.0),
-                        Self::srgb_to_linear((g as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((g as f32 + boost).clamp(0.0, 255.0) / 255.0),
-                        Self::srgb_to_linear((b as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((b as f32 + boost).clamp(0.0, 255.0) / 255.0),
                         1.0,
                     ]
                 } else {
-                    // Inactive tab: slightly brighter than tab bar background
+                    // Inactive tab: between tab bar background and active tab
                     let [r, g, b] = self.palette.default_bg;
-                    let boost = 30.0_f32;
+                    let boost = if is_light { -30.0_f32 } else { 30.0_f32 };
                     [
-                        Self::srgb_to_linear((r as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((r as f32 + boost).clamp(0.0, 255.0) / 255.0),
-                        Self::srgb_to_linear((g as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((g as f32 + boost).clamp(0.0, 255.0) / 255.0),
-                        Self::srgb_to_linear((b as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((b as f32 + boost).clamp(0.0, 255.0) / 255.0),
                         1.0,
                     ]
                 };
@@ -4651,7 +4668,11 @@ impl Renderer {
                     CursorShape::BlinkingUnderline | CursorShape::SteadyUnderline => 1,
                     CursorShape::BlinkingBar | CursorShape::SteadyBar => 2,
                 },
-                background_opacity: self.background_opacity,
+                background_opacity: if terminal.using_alternate_screen {
+                    1.0
+                } else {
+                    self.background_opacity
+                },
                 selection_start_col: sel_start_col,
                 selection_start_row: sel_start_row,
                 selection_end_col: sel_end_col,
@@ -4767,9 +4788,10 @@ impl Renderer {
         // ═══════════════════════════════════════════════════════════════════
         let statusline_cols = {
             let statusline_y = self.statusline_y();
+            let is_light = self.palette.is_light();
             
             // Update statusline GPU cells from content, passing window width for gap expansion
-            let cols = self.update_statusline_cells(statusline_content, width);
+            let cols = self.update_statusline_cells(statusline_content, width, is_light);
             
             if cols > 0 {
                 // Upload statusline cells to GPU
@@ -5009,10 +5031,19 @@ impl Renderer {
 
         {
             let [bg_r, bg_g, bg_b] = self.palette.default_bg;
-            let bg_r_linear = Self::srgb_to_linear(bg_r as f32 / 255.0) as f64;
+            let mut bg_r_linear = Self::srgb_to_linear(bg_r as f32 / 255.0) as f64;
-            let bg_g_linear = Self::srgb_to_linear(bg_g as f32 / 255.0) as f64;
+            let mut bg_g_linear = Self::srgb_to_linear(bg_g as f32 / 255.0) as f64;
-            let bg_b_linear = Self::srgb_to_linear(bg_b as f32 / 255.0) as f64;
+            let mut bg_b_linear = Self::srgb_to_linear(bg_b as f32 / 255.0) as f64;
             let bg_alpha = self.background_opacity as f64;
+            
+            // If the compositor expects premultiplied alpha, we must premultiply the clear color.
+            // Otherwise, light backgrounds with opacity will look fully opaque or super-luminous.
+            if self.surface_config.alpha_mode == wgpu::CompositeAlphaMode::PreMultiplied {
+                bg_r_linear *= bg_alpha;
+                bg_g_linear *= bg_alpha;
+                bg_b_linear *= bg_alpha;
+            }
+
             let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
                 label: Some("Render Pass"),
                 color_attachments: &[Some(wgpu::RenderPassColorAttachment {

src/terminal.rs

@@ -186,6 +186,15 @@ impl Default for ColorPalette {
 }
 
 impl ColorPalette {
+    /// Return whether this palette is considered "light" based on default background luminance.
+    pub fn is_light(&self) -> bool {
+        let [r, g, b] = self.default_bg;
+        // Standard perceived luminance calculation
+        let luminance =
+            0.299 * (r as f32) + 0.587 * (g as f32) + 0.114 * (b as f32);
+        luminance > 128.0
+    }
+
     /// Parse a color specification like "#RRGGBB" or "rgb:RR/GG/BB".
     pub fn parse_color_spec(spec: &str) -> Option<[u8; 3]> {
         let spec = spec.trim();