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diff --git a/include/ricochet/tui/input.hh b/include/ricochet/tui/input.hh
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+++ b/include/ricochet/tui/input.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 <chrono>
+#include <cstdint>
+#include <string>
+#include <variant>
+
+namespace ricochet::tui {
+
+struct ScreenSize
+{
+  int rows { 0 };
+  int columns { 0 };
+  bool operator==( const ScreenSize& ) const = default;
+};
+
+struct CellPoint
+{
+  int row { 0 };
+  int column { 0 };
+};
+
+struct Modifiers
+{
+  bool shift { false };
+  bool control { false };
+  bool alt { false };
+  bool operator==( const Modifiers& ) const = default;
+};
+
+enum class KeyCode : std::uint8_t
+{
+  Character,
+  Escape,
+  Enter,
+  Tab,
+  Backspace,
+  Delete,
+  Insert,
+  Left,
+  Right,
+  Up,
+  Down,
+  Home,
+  End,
+  PageUp,
+  PageDown,
+  Function,
+  Unsupported
+};
+
+struct Key
+{
+  KeyCode code { KeyCode::Unsupported };
+  Modifiers modifiers {};
+  char32_t character { 0 };
+  unsigned int function { 0 };
+};
+
+struct TextInput
+{ char32_t character { 0 }; };
+
+struct Paste
+{ std::u32string text {}; };
+
+struct MouseButtons
+{
+  bool left { false };
+  bool middle { false };
+  bool right { false };
+};
+
+struct Mouse
+{
+  // Screen coordinates; the view router converts these to region-local coordinates.
+  CellPoint position {};
+  Modifiers modifiers {};
+  MouseButtons pressed {};
+  MouseButtons released {};
+  bool motion { false };
+  int wheel_steps { 0 }; // Positive scrolls down.
+};
+
+struct Resize
+{ ScreenSize size {}; };
+
+struct Tick
+{ std::chrono::steady_clock::time_point now {}; };
+
+enum class TerminalCloseReason : std::uint8_t
+{
+  Disconnected,
+  TerminationSignal
+};
+
+struct TerminalClosed
+{ TerminalCloseReason reason { TerminalCloseReason::Disconnected }; };
+
+using InputEvent = std::variant<Key, TextInput, Paste, Mouse, Resize, Tick, TerminalClosed>;
+
+} // namespace ricochet::tui