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diff --git a/src/tui/document_view.hh b/src/tui/document_view.hh
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+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "document_text.hh"
+#include "layout.hh"
+
+#include <chrono>
+
+namespace ricochet::tui::detail {
+
+enum class ViewMotion : std::uint8_t
+{
+  Left,
+  Right,
+  Up,
+  Down,
+  NextWord,
+  PreviousWord,
+  WordEnd,
+  LineStart,
+  LineEnd,
+  DocumentStart,
+  DocumentEnd,
+  PageUp,
+  PageDown,
+  HalfPageUp,
+  HalfPageDown,
+  PanLeft,
+  PanRight
+};
+
+// One tab's reading state. It owns the logical snapshot; screen rows are caches.
+// Keyboard, mouse and host navigation all use the same layout/source mappings.
+class DocumentView
+{
+public:
+  DocumentView( Document document, ViewSnapshot snapshot, const TextService& text, ScreenSize viewport );
+
+  const Document& document() const;
+  const ViewSnapshot& snapshot() const;
+  void resize( ScreenSize viewport );
+  void move( ViewMotion motion );
+  void press( CellPoint point, std::chrono::steady_clock::time_point now );
+  // The session routes these only while dragging() owns mouse capture.
+  void drag( CellPoint point );
+  void release( CellPoint point );
+  void stop_drag();
+  bool dragging() const;
+  bool tick( std::chrono::steady_clock::time_point now );
+  void begin_selection();
+  void cancel_selection();
+  std::optional<std::string> selected_text() const;
+  void wheel( int steps );
+  bool locate( const DocumentPoint& point );
+  std::optional<HitTarget> focused_target() const;
+  void draw( Frame& frame, CellPoint origin ) const;
+
+private:
+  std::size_t last_top_row() const;
+  void set_top_row( std::size_t row );
+  void restore_viewport();
+  void apply_scrolls( std::span<const HorizontalScroll> changes );
+  void reveal_cursor();
+  void finish_move( bool preserve_column );
+  void move_rows( std::int64_t distance, bool page );
+  void extend_selection();
+  void drag_to_pointer();
+
+  struct Drag
+  {
+    CellPoint press {};
+    CellPoint pointer {};
+    DocumentRange anchor {};
+    bool selecting { false };
+    std::chrono::steady_clock::time_point next_scroll {};
+  };
+
+  Document document_;
+  ViewSnapshot snapshot_;
+  const TextService& text_;
+  DocumentText content_;
+  ScreenSize viewport_;
+  DocumentLayout layout_;
+  std::size_t top_row_ { 0 };
+  std::int64_t desired_column_ { 0 };
+  bool follow_cursor_ { false };
+  std::optional<Drag> drag_ {};
+};
+
+} // namespace ricochet::tui::detail