diff --git a/ui/text_editor.v b/ui/text_editor.v
index ea3b0d0..2efb2a3 100644
--- a/ui/text_editor.v
+++ b/ui/text_editor.v
@@ -1,7 +1,667 @@
 module ui2
 
 import strings
+import encoding.utf8
 
+const unicode_mark_ranges = [
+	u32(0x0300),
+	0x036f,
+	0x0483,
+	0x0489,
+	0x0591,
+	0x05bd,
+	0x05bf,
+	0x05bf,
+	0x05c1,
+	0x05c2,
+	0x05c4,
+	0x05c5,
+	0x05c7,
+	0x05c7,
+	0x0610,
+	0x061a,
+	0x064b,
+	0x065f,
+	0x0670,
+	0x0670,
+	0x06d6,
+	0x06dc,
+	0x06df,
+	0x06e4,
+	0x06e7,
+	0x06e8,
+	0x06ea,
+	0x06ed,
+	0x0711,
+	0x0711,
+	0x0730,
+	0x074a,
+	0x07a6,
+	0x07b0,
+	0x07eb,
+	0x07f3,
+	0x07fd,
+	0x07fd,
+	0x0816,
+	0x0819,
+	0x081b,
+	0x0823,
+	0x0825,
+	0x0827,
+	0x0829,
+	0x082d,
+	0x0859,
+	0x085b,
+	0x0897,
+	0x089f,
+	0x08ca,
+	0x08e1,
+	0x08e3,
+	0x0903,
+	0x093a,
+	0x093c,
+	0x093e,
+	0x094f,
+	0x0951,
+	0x0957,
+	0x0962,
+	0x0963,
+	0x0981,
+	0x0983,
+	0x09bc,
+	0x09bc,
+	0x09be,
+	0x09c4,
+	0x09c7,
+	0x09c8,
+	0x09cb,
+	0x09cd,
+	0x09d7,
+	0x09d7,
+	0x09e2,
+	0x09e3,
+	0x09fe,
+	0x09fe,
+	0x0a01,
+	0x0a03,
+	0x0a3c,
+	0x0a3c,
+	0x0a3e,
+	0x0a42,
+	0x0a47,
+	0x0a48,
+	0x0a4b,
+	0x0a4d,
+	0x0a51,
+	0x0a51,
+	0x0a70,
+	0x0a71,
+	0x0a75,
+	0x0a75,
+	0x0a81,
+	0x0a83,
+	0x0abc,
+	0x0abc,
+	0x0abe,
+	0x0ac5,
+	0x0ac7,
+	0x0ac9,
+	0x0acb,
+	0x0acd,
+	0x0ae2,
+	0x0ae3,
+	0x0afa,
+	0x0aff,
+	0x0b01,
+	0x0b03,
+	0x0b3c,
+	0x0b3c,
+	0x0b3e,
+	0x0b44,
+	0x0b47,
+	0x0b48,
+	0x0b4b,
+	0x0b4d,
+	0x0b55,
+	0x0b57,
+	0x0b62,
+	0x0b63,
+	0x0b82,
+	0x0b82,
+	0x0bbe,
+	0x0bc2,
+	0x0bc6,
+	0x0bc8,
+	0x0bca,
+	0x0bcd,
+	0x0bd7,
+	0x0bd7,
+	0x0c00,
+	0x0c04,
+	0x0c3c,
+	0x0c3c,
+	0x0c3e,
+	0x0c44,
+	0x0c46,
+	0x0c48,
+	0x0c4a,
+	0x0c4d,
+	0x0c55,
+	0x0c56,
+	0x0c62,
+	0x0c63,
+	0x0c81,
+	0x0c83,
+	0x0cbc,
+	0x0cbc,
+	0x0cbe,
+	0x0cc4,
+	0x0cc6,
+	0x0cc8,
+	0x0cca,
+	0x0ccd,
+	0x0cd5,
+	0x0cd6,
+	0x0ce2,
+	0x0ce3,
+	0x0cf3,
+	0x0cf3,
+	0x0d00,
+	0x0d03,
+	0x0d3b,
+	0x0d3c,
+	0x0d3e,
+	0x0d44,
+	0x0d46,
+	0x0d48,
+	0x0d4a,
+	0x0d4d,
+	0x0d57,
+	0x0d57,
+	0x0d62,
+	0x0d63,
+	0x0d81,
+	0x0d83,
+	0x0dca,
+	0x0dca,
+	0x0dcf,
+	0x0dd4,
+	0x0dd6,
+	0x0dd6,
+	0x0dd8,
+	0x0ddf,
+	0x0df2,
+	0x0df3,
+	0x0e31,
+	0x0e31,
+	0x0e34,
+	0x0e3a,
+	0x0e47,
+	0x0e4e,
+	0x0eb1,
+	0x0eb1,
+	0x0eb4,
+	0x0ebc,
+	0x0ec8,
+	0x0ece,
+	0x0f18,
+	0x0f19,
+	0x0f35,
+	0x0f35,
+	0x0f37,
+	0x0f37,
+	0x0f39,
+	0x0f39,
+	0x0f3e,
+	0x0f3f,
+	0x0f71,
+	0x0f84,
+	0x0f86,
+	0x0f87,
+	0x0f8d,
+	0x0f97,
+	0x0f99,
+	0x0fbc,
+	0x0fc6,
+	0x0fc6,
+	0x102b,
+	0x103e,
+	0x1056,
+	0x1059,
+	0x105e,
+	0x1060,
+	0x1062,
+	0x1064,
+	0x1067,
+	0x106d,
+	0x1071,
+	0x1074,
+	0x1082,
+	0x108d,
+	0x108f,
+	0x108f,
+	0x109a,
+	0x109d,
+	0x135d,
+	0x135f,
+	0x1712,
+	0x1715,
+	0x1732,
+	0x1734,
+	0x1752,
+	0x1753,
+	0x1772,
+	0x1773,
+	0x17b4,
+	0x17d3,
+	0x17dd,
+	0x17dd,
+	0x180b,
+	0x180d,
+	0x180f,
+	0x180f,
+	0x1885,
+	0x1886,
+	0x18a9,
+	0x18a9,
+	0x1920,
+	0x192b,
+	0x1930,
+	0x193b,
+	0x1a17,
+	0x1a1b,
+	0x1a55,
+	0x1a5e,
+	0x1a60,
+	0x1a7c,
+	0x1a7f,
+	0x1a7f,
+	0x1ab0,
+	0x1add,
+	0x1ae0,
+	0x1aeb,
+	0x1b00,
+	0x1b04,
+	0x1b34,
+	0x1b44,
+	0x1b6b,
+	0x1b73,
+	0x1b80,
+	0x1b82,
+	0x1ba1,
+	0x1bad,
+	0x1be6,
+	0x1bf3,
+	0x1c24,
+	0x1c37,
+	0x1cd0,
+	0x1cd2,
+	0x1cd4,
+	0x1ce8,
+	0x1ced,
+	0x1ced,
+	0x1cf4,
+	0x1cf4,
+	0x1cf7,
+	0x1cf9,
+	0x1dc0,
+	0x1dff,
+	0x20d0,
+	0x20f0,
+	0x2cef,
+	0x2cf1,
+	0x2d7f,
+	0x2d7f,
+	0x2de0,
+	0x2dff,
+	0x302a,
+	0x302f,
+	0x3099,
+	0x309a,
+	0xa66f,
+	0xa672,
+	0xa674,
+	0xa67d,
+	0xa69e,
+	0xa69f,
+	0xa6f0,
+	0xa6f1,
+	0xa802,
+	0xa802,
+	0xa806,
+	0xa806,
+	0xa80b,
+	0xa80b,
+	0xa823,
+	0xa827,
+	0xa82c,
+	0xa82c,
+	0xa880,
+	0xa881,
+	0xa8b4,
+	0xa8c5,
+	0xa8e0,
+	0xa8f1,
+	0xa8ff,
+	0xa8ff,
+	0xa926,
+	0xa92d,
+	0xa947,
+	0xa953,
+	0xa980,
+	0xa983,
+	0xa9b3,
+	0xa9c0,
+	0xa9e5,
+	0xa9e5,
+	0xaa29,
+	0xaa36,
+	0xaa43,
+	0xaa43,
+	0xaa4c,
+	0xaa4d,
+	0xaa7b,
+	0xaa7d,
+	0xaab0,
+	0xaab0,
+	0xaab2,
+	0xaab4,
+	0xaab7,
+	0xaab8,
+	0xaabe,
+	0xaabf,
+	0xaac1,
+	0xaac1,
+	0xaaeb,
+	0xaaef,
+	0xaaf5,
+	0xaaf6,
+	0xabe3,
+	0xabea,
+	0xabec,
+	0xabed,
+	0xfb1e,
+	0xfb1e,
+	0xfe00,
+	0xfe0f,
+	0xfe20,
+	0xfe2f,
+	0x101fd,
+	0x101fd,
+	0x102e0,
+	0x102e0,
+	0x10376,
+	0x1037a,
+	0x10a01,
+	0x10a03,
+	0x10a05,
+	0x10a06,
+	0x10a0c,
+	0x10a0f,
+	0x10a38,
+	0x10a3a,
+	0x10a3f,
+	0x10a3f,
+	0x10ae5,
+	0x10ae6,
+	0x10d24,
+	0x10d27,
+	0x10d69,
+	0x10d6d,
+	0x10eab,
+	0x10eac,
+	0x10efa,
+	0x10eff,
+	0x10f46,
+	0x10f50,
+	0x10f82,
+	0x10f85,
+	0x11000,
+	0x11002,
+	0x11038,
+	0x11046,
+	0x11070,
+	0x11070,
+	0x11073,
+	0x11074,
+	0x1107f,
+	0x11082,
+	0x110b0,
+	0x110ba,
+	0x110c2,
+	0x110c2,
+	0x11100,
+	0x11102,
+	0x11127,
+	0x11134,
+	0x11145,
+	0x11146,
+	0x11173,
+	0x11173,
+	0x11180,
+	0x11182,
+	0x111b3,
+	0x111c0,
+	0x111c9,
+	0x111cc,
+	0x111ce,
+	0x111cf,
+	0x1122c,
+	0x11237,
+	0x1123e,
+	0x1123e,
+	0x11241,
+	0x11241,
+	0x112df,
+	0x112ea,
+	0x11300,
+	0x11303,
+	0x1133b,
+	0x1133c,
+	0x1133e,
+	0x11344,
+	0x11347,
+	0x11348,
+	0x1134b,
+	0x1134d,
+	0x11357,
+	0x11357,
+	0x11362,
+	0x11363,
+	0x11366,
+	0x1136c,
+	0x11370,
+	0x11374,
+	0x113b8,
+	0x113c0,
+	0x113c2,
+	0x113c2,
+	0x113c5,
+	0x113c5,
+	0x113c7,
+	0x113ca,
+	0x113cc,
+	0x113d0,
+	0x113d2,
+	0x113d2,
+	0x113e1,
+	0x113e2,
+	0x11435,
+	0x11446,
+	0x1145e,
+	0x1145e,
+	0x114b0,
+	0x114c3,
+	0x115af,
+	0x115b5,
+	0x115b8,
+	0x115c0,
+	0x115dc,
+	0x115dd,
+	0x11630,
+	0x11640,
+	0x116ab,
+	0x116b7,
+	0x1171d,
+	0x1172b,
+	0x1182c,
+	0x1183a,
+	0x11930,
+	0x11935,
+	0x11937,
+	0x11938,
+	0x1193b,
+	0x1193e,
+	0x11940,
+	0x11940,
+	0x11942,
+	0x11943,
+	0x119d1,
+	0x119d7,
+	0x119da,
+	0x119e0,
+	0x119e4,
+	0x119e4,
+	0x11a01,
+	0x11a0a,
+	0x11a33,
+	0x11a39,
+	0x11a3b,
+	0x11a3e,
+	0x11a47,
+	0x11a47,
+	0x11a51,
+	0x11a5b,
+	0x11a8a,
+	0x11a99,
+	0x11b60,
+	0x11b67,
+	0x11c2f,
+	0x11c36,
+	0x11c38,
+	0x11c3f,
+	0x11c92,
+	0x11ca7,
+	0x11ca9,
+	0x11cb6,
+	0x11d31,
+	0x11d36,
+	0x11d3a,
+	0x11d3a,
+	0x11d3c,
+	0x11d3d,
+	0x11d3f,
+	0x11d45,
+	0x11d47,
+	0x11d47,
+	0x11d8a,
+	0x11d8e,
+	0x11d90,
+	0x11d91,
+	0x11d93,
+	0x11d97,
+	0x11ef3,
+	0x11ef6,
+	0x11f00,
+	0x11f01,
+	0x11f03,
+	0x11f03,
+	0x11f34,
+	0x11f3a,
+	0x11f3e,
+	0x11f42,
+	0x11f5a,
+	0x11f5a,
+	0x13440,
+	0x13440,
+	0x13447,
+	0x13455,
+	0x1611e,
+	0x1612f,
+	0x16af0,
+	0x16af4,
+	0x16b30,
+	0x16b36,
+	0x16f4f,
+	0x16f4f,
+	0x16f51,
+	0x16f87,
+	0x16f8f,
+	0x16f92,
+	0x16fe4,
+	0x16fe4,
+	0x16ff0,
+	0x16ff1,
+	0x1bc9d,
+	0x1bc9e,
+	0x1cf00,
+	0x1cf2d,
+	0x1cf30,
+	0x1cf46,
+	0x1d165,
+	0x1d169,
+	0x1d16d,
+	0x1d172,
+	0x1d17b,
+	0x1d182,
+	0x1d185,
+	0x1d18b,
+	0x1d1aa,
+	0x1d1ad,
+	0x1d242,
+	0x1d244,
+	0x1da00,
+	0x1da36,
+	0x1da3b,
+	0x1da6c,
+	0x1da75,
+	0x1da75,
+	0x1da84,
+	0x1da84,
+	0x1da9b,
+	0x1da9f,
+	0x1daa1,
+	0x1daaf,
+	0x1e000,
+	0x1e006,
+	0x1e008,
+	0x1e018,
+	0x1e01b,
+	0x1e021,
+	0x1e023,
+	0x1e024,
+	0x1e026,
+	0x1e02a,
+	0x1e08f,
+	0x1e08f,
+	0x1e130,
+	0x1e136,
+	0x1e2ae,
+	0x1e2ae,
+	0x1e2ec,
+	0x1e2ef,
+	0x1e4ec,
+	0x1e4ef,
+	0x1e5ee,
+	0x1e5ef,
+	0x1e6e3,
+	0x1e6e3,
+	0x1e6e6,
+	0x1e6e6,
+	0x1e6ee,
+	0x1e6ef,
+	0x1e6f5,
+	0x1e6f5,
+	0x1e8d0,
+	0x1e8d6,
+	0x1e944,
+	0x1e94a,
+	0xe0100,
+	0xe01ef,
+]
+
+// Unicode 17.0.0 Mark ranges: 327
+// Unicode 17.0.0 Mark ranges: 561
 // TextSelection stores positions as rune offsets, so cursor movement is stable
 // for UTF-8 text. The selection is collapsed when anchor == caret.
 pub struct TextSelection {
@@ -68,6 +728,11 @@ pub fn (mut e TextEditor) select_all() {
 
 pub fn (mut e TextEditor) move_caret(delta int, extend bool) {
 	length := rune_len(e.text)
+	if !extend && !e.selection.collapsed() {
+		start, end := e.selection.ordered()
+		e.set_caret(if delta < 0 { start } else { end })
+		return
+	}
 	next := clamp_int(e.selection.caret + delta, 0, length)
 	if extend {
 		e.selection.caret = next
@@ -79,6 +744,71 @@ pub fn (mut e TextEditor) move_caret(delta int, extend bool) {
 	}
 }
 
+// move_word_caret moves to the beginning of the previous or next word. Word
+// positions are rune offsets, so Ctrl+Arrow remains safe for Unicode input.
+pub fn (mut e TextEditor) move_word_caret(direction int, extend bool) {
+	if !extend && !e.selection.collapsed() {
+		start, end := e.selection.ordered()
+		e.set_caret(if direction < 0 { start } else { end })
+		return
+	}
+	runes := e.text.runes()
+	next := if direction < 0 {
+		previous_word_boundary(runes, e.selection.caret)
+	} else {
+		next_word_boundary(runes, e.selection.caret)
+	}
+	e.move_caret_to(next, extend)
+}
+
+// move_caret_to moves or extends the selection to an absolute rune offset.
+pub fn (mut e TextEditor) move_caret_to(pos int, extend bool) {
+	next := clamp_int(pos, 0, rune_len(e.text))
+	if extend {
+		e.selection.caret = next
+		return
+	}
+	e.set_caret(next)
+}
+
+// apply_text_editor_navigation is shared by the custom renderer and tests.
+// A single-line field treats Page Up/Down like Home/End, matching the useful
+// boundary navigation users expect when there is no vertical viewport.
+fn apply_text_editor_navigation(mut editor TextEditor, key string, extend bool, ctrl bool) bool {
+	match key {
+		'left' {
+			if ctrl {
+				editor.move_word_caret(-1, extend)
+			} else {
+				editor.move_caret(-1, extend)
+			}
+		}
+		'right' {
+			if ctrl {
+				editor.move_word_caret(1, extend)
+			} else {
+				editor.move_caret(1, extend)
+			}
+		}
+		'home', 'page_up' {
+			editor.move_caret_to(0, extend)
+		}
+		'end', 'page_down' {
+			editor.move_caret_to(rune_len(editor.text), extend)
+		}
+		'a' {
+			if !ctrl {
+				return false
+			}
+			editor.select_all()
+		}
+		else {
+			return false
+		}
+	}
+	return true
+}
+
 pub fn (mut e TextEditor) insert_text(value string) {
 	e.replace_selection(value)
 }
@@ -162,3 +892,40 @@ fn clamp_int(value int, min int, max int) int {
 	}
 	return value
 }
+
+fn is_word_rune(value rune) bool {
+	return utf8.is_letter(value) || utf8.is_number(value) || value == `_` || is_unicode_mark(value)
+}
+
+// is_unicode_mark reports whether value belongs to a Unicode Mark category
+// (Mn, Mc, or Me). The table is generated from Unicode general categories.
+fn is_unicode_mark(value rune) bool {
+	for index := 0; index < unicode_mark_ranges.len; index += 2 {
+		if u32(value) >= unicode_mark_ranges[index] && u32(value) <= unicode_mark_ranges[index + 1] {
+			return true
+		}
+	}
+	return false
+}
+
+fn previous_word_boundary(runes []rune, caret int) int {
+	mut position := clamp_int(caret, 0, runes.len)
+	for position > 0 && !is_word_rune(runes[position - 1]) {
+		position--
+	}
+	for position > 0 && is_word_rune(runes[position - 1]) {
+		position--
+	}
+	return position
+}
+
+fn next_word_boundary(runes []rune, caret int) int {
+	mut position := clamp_int(caret, 0, runes.len)
+	for position < runes.len && is_word_rune(runes[position]) {
+		position++
+	}
+	for position < runes.len && !is_word_rune(runes[position]) {
+		position++
+	}
+	return position
+}
diff --git a/ui/text_editor_test.v b/ui/text_editor_test.v
index 31869c0..ad150f0 100644
--- a/ui/text_editor_test.v
+++ b/ui/text_editor_test.v
@@ -84,6 +84,97 @@ fn test_text_editor_move_and_select_all() {
 	assert end2 == 3
 }
 
+fn test_text_editor_navigation_extends_and_collapses_selection() {
+	mut editor := text_editor('abcdef')
+	editor.set_selection(1, 5)
+	assert apply_text_editor_navigation(mut editor, 'left', false, false)
+	assert editor.selection == TextSelection{
+		anchor: 1
+		caret: 1
+	}
+
+	editor.set_selection(1, 5)
+	assert apply_text_editor_navigation(mut editor, 'right', false, false)
+	assert editor.selection == TextSelection{
+		anchor: 5
+		caret: 5
+	}
+
+	editor.set_caret(3)
+	assert apply_text_editor_navigation(mut editor, 'left', true, false)
+	assert editor.selection == TextSelection{
+		anchor: 3
+		caret: 2
+	}
+	assert apply_text_editor_navigation(mut editor, 'end', true, false)
+	assert editor.selection == TextSelection{
+		anchor: 3
+		caret: 6
+	}
+	assert apply_text_editor_navigation(mut editor, 'home', false, false)
+	assert editor.selection == TextSelection{}
+}
+
+fn test_text_editor_navigation_moves_by_unicode_words_and_page_boundaries() {
+	mut editor := text_editor('one, two_2  世界')
+	editor.set_caret(rune_len(editor.text))
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 12
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 5
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 0
+	assert apply_text_editor_navigation(mut editor, 'right', false, true)
+	assert editor.selection.caret == 5
+	assert apply_text_editor_navigation(mut editor, 'right', true, true)
+	assert editor.selection == TextSelection{
+		anchor: 5
+		caret: 12
+	}
+
+	assert apply_text_editor_navigation(mut editor, 'page_down', false, false)
+	assert editor.selection.caret == rune_len(editor.text)
+	assert apply_text_editor_navigation(mut editor, 'page_up', true, false)
+	assert editor.selection == TextSelection{
+		anchor: rune_len(editor.text)
+		caret: 0
+	}
+	assert apply_text_editor_navigation(mut editor, 'a', false, true)
+	start, end := editor.selection.ordered()
+	assert start == 0
+	assert end == rune_len(editor.text)
+	assert !apply_text_editor_navigation(mut editor, 'a', false, false)
+}
+
+fn test_text_editor_word_navigation_keeps_combining_marks_in_words() {
+	mut editor := text_editor('éclair cafe')
+	editor.set_caret(rune_len(editor.text))
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 7
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 0
+}
+
+fn test_text_editor_word_navigation_keeps_indic_and_arabic_marks_in_words() {
+	assert is_unicode_mark(`ि`)
+	assert is_unicode_mark(`َ`)
+	assert is_unicode_mark(`ࢗ`)
+
+	mut editor := text_editor('किरण test')
+	editor.set_caret(rune_len(editor.text))
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 5
+	assert apply_text_editor_navigation(mut editor, 'left', false, true)
+	assert editor.selection.caret == 0
+
+	mut newer_arabic := text_editor('بࢗت test')
+	newer_arabic.set_caret(rune_len(newer_arabic.text))
+	assert apply_text_editor_navigation(mut newer_arabic, 'left', false, true)
+	assert newer_arabic.selection.caret == 4
+	assert apply_text_editor_navigation(mut newer_arabic, 'left', false, true)
+	assert newer_arabic.selection.caret == 0
+}
+
 fn test_rich_text_area_keeps_runs() {
 	runs := [
 		TextRun{
diff --git a/ui/ui_custom_test.v b/ui/ui_custom_test.v
index a667b6a..87ac263 100644
--- a/ui/ui_custom_test.v
+++ b/ui/ui_custom_test.v
@@ -98,6 +98,23 @@ $if ui2_custom_rendering ? {
 		assert system_symbol_fallback('future.symbol') == ''
 	}
 
+	fn test_custom_text_navigation_uses_the_platform_primary_modifier() {
+		assert !text_navigation_primary_modifier(false, false, false)
+		$if macos {
+			assert !text_navigation_primary_modifier(true, false, false)
+			assert text_navigation_primary_modifier(false, false, true)
+			assert text_navigation_word_modifier(false, true)
+			assert !text_navigation_word_modifier(true, false)
+			assert text_navigation_boundary_modifier(true)
+		} $else {
+			assert text_navigation_primary_modifier(true, false, false)
+			assert !text_navigation_primary_modifier(true, true, false)
+			assert text_navigation_word_modifier(true, false)
+			assert !text_navigation_word_modifier(true, true)
+			assert !text_navigation_boundary_modifier(true)
+		}
+	}
+
 	fn test_custom_slider_pointer_value_uses_range_step_and_orientation() {
 		horizontal := HitTarget{
 			slider: true
@@ -481,3 +498,18 @@ $if ui2_custom_rendering ? {
 		g_touch = TouchState{}
 	}
 }
+
+fn test_text_field_selection_text_uses_rune_offsets() {
+	before, selected := text_field_selection_text('a🙂bc', TextSelection{
+		anchor: 4
+		caret: 1
+	})
+	assert before == 'a'
+	assert selected == '🙂bc'
+}
+
+fn test_text_field_selection_origin_respects_text_alignment() {
+	assert text_field_aligned_text_origin(10, 100, 40, .left) == 10
+	assert text_field_aligned_text_origin(10, 100, 40, .center) == 40
+	assert text_field_aligned_text_origin(10, 100, 40, .right) == 70
+}
diff --git a/ui/ui_immediate.c.v b/ui/ui_immediate.c.v
index 79b3ffc..648da1b 100644
--- a/ui/ui_immediate.c.v
+++ b/ui/ui_immediate.c.v
@@ -637,7 +637,7 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 					}
 				}
 				if !dispatch_key_event(e) {
-					handle_key_down(e.key_code)
+					handle_key_down(e.key_code, e.modifiers)
 				}
 			}
 			.files_dropped {
@@ -1019,7 +1019,7 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		fire_field_change(g_focused_field)
 	}
 
-	fn handle_key_down(key gg.KeyCode) {
+	fn handle_key_down(key gg.KeyCode, modifiers u32) {
 		if g_focused_field.len == 0 {
 			return
 		}
@@ -1040,17 +1040,65 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 				fire_field_change(g_focused_field)
 			}
 		}
-		if key == .left || key == .right || key == .home || key == .end {
-			if key == .left {
-				editor.move_caret(-1, false)
-			} else if key == .right {
-				editor.move_caret(1, false)
-			} else if key == .home {
-				editor.set_caret(0)
-			} else {
-				editor.set_caret(rune_len(editor.text))
+		mut navigation_key := match key {
+			.left { 'left' }
+			.right { 'right' }
+			.up { 'up' }
+			.down { 'down' }
+			.home { 'home' }
+			.end { 'end' }
+			.page_up { 'page_up' }
+			.page_down { 'page_down' }
+			.a { 'a' }
+			else { '' }
+		}
+		mut focused_text_area := false
+		for target in g_hit_targets {
+			if target.id == g_focused_field {
+				focused_text_area = target.text_area
+				break
 			}
-			replace_text_editor(g_focused_field, editor)
+		}
+		if focused_text_area && (navigation_key == 'page_up' || navigation_key == 'page_down') {
+			page_focused_text_area(if navigation_key == 'page_up' { -1 } else { 1 })
+			return
+		}
+		primary_modifier := text_navigation_primary_modifier(
+			modifiers & u32(gg.Modifier.ctrl) != 0,
+			modifiers & u32(gg.Modifier.alt) != 0,
+			modifiers & u32(gg.Modifier.super) != 0,
+		)
+		word_modifier := text_navigation_word_modifier(
+			modifiers & u32(gg.Modifier.ctrl) != 0,
+			modifiers & u32(gg.Modifier.alt) != 0,
+		)
+		boundary_modifier := text_navigation_boundary_modifier(
+			modifiers & u32(gg.Modifier.super) != 0,
+		)
+		if focused_text_area && (navigation_key == 'up' || navigation_key == 'down') {
+			if move_focused_text_area_caret(mut editor, if navigation_key == 'up' { -1 } else { 1 },
+				modifiers & u32(gg.Modifier.shift) != 0) {
+				g_text_editors[g_focused_field] = editor
+			}
+			return
+		}
+		if focused_text_area && (navigation_key == 'home' || navigation_key == 'end')
+			&& !primary_modifier {
+			if move_focused_text_area_line_boundary(mut editor, navigation_key == 'end',
+				modifiers & u32(gg.Modifier.shift) != 0) {
+				g_text_editors[g_focused_field] = editor
+			}
+			return
+		}
+		if boundary_modifier && navigation_key == 'left' {
+			navigation_key = 'home'
+		} else if boundary_modifier && navigation_key == 'right' {
+			navigation_key = 'end'
+		}
+		navigation_modifier := if navigation_key == 'a' { primary_modifier } else { word_modifier }
+		if navigation_key.len > 0 && apply_text_editor_navigation(mut editor, navigation_key,
+			modifiers & u32(gg.Modifier.shift) != 0, navigation_modifier) {
+			g_text_editors[g_focused_field] = editor
 		}
 		if key == .enter || key == .kp_enter {
 			for target in g_hit_targets {
@@ -1073,6 +1121,44 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		}
 	}
 
+	// text_navigation_primary_modifier keeps the native text-editing shortcuts
+	// available without treating AltGr (reported as Ctrl+Alt on Windows) as
+	// Control. Command is the primary modifier on macOS.
+	fn text_navigation_primary_modifier(ctrl bool, alt bool, super_ bool) bool {
+		$if macos {
+			return super_
+		} $else {
+			return ctrl && !alt
+		}
+	}
+
+	// text_navigation_word_modifier follows native word movement: Option on
+	// macOS, and Control everywhere else. Excluding Alt on non-macOS systems
+	// keeps AltGr from being interpreted as a Control shortcut.
+fn text_navigation_word_modifier(ctrl bool, alt bool) bool {
+		$if macos {
+			return alt
+		} $else {
+			return ctrl && !alt
+		}
+}
+
+// text_navigation_boundary_modifier maps Command+Arrow to line boundaries on
+// macOS. On other platforms Ctrl+Arrow must remain word navigation.
+fn text_navigation_boundary_modifier(super_ bool) bool {
+	$if macos {
+		return super_
+	} $else {
+		return false
+	}
+}
+
+fn page_focused_text_area(direction int) {
+		viewport := g_scroll_viewports[g_focused_field] or { return }
+		set_scroll_offset(g_focused_field, scroll_offset(g_focused_field) + f64(direction) * viewport.height,
+			scroll_maximum(g_focused_field))
+	}
+
 	fn fire_field_change(id string) {
 		for target in g_hit_targets {
 			if target.id == id && (target.text_field || target.text_area) && target.emit_change {
@@ -1730,6 +1816,10 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 				is_focused := g_focused_field == el.id
 				draw_control_surface(ctx, x, y, el.frame.width, el.frame.height, el.box,
 					is_focused, el.enabled)
+				if is_focused && !editor.selection.collapsed() {
+					draw_text_field_selection(ctx, display_text, editor.selection, x + padding_left,
+						y, content_width, el.frame.height, el.text_style)
+				}
 				if current_text.len > 0 {
 					draw_editable_text(ctx, display_text, x + padding_left, y, content_width, el.frame.height, el.text_style)
 				} else if el.placeholder.len > 0 {
@@ -1743,7 +1833,9 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 					before := editor.text.runes()[..editor.selection.caret].string()
 					caret_text := text_field_display_text(before, el.secure)
 					text_w := f64(ctx.text_width(caret_text))
-					cursor_x := x + padding_left + text_w
+					text_origin := text_field_aligned_text_origin(x + padding_left, content_width,
+						f64(ctx.text_width(display_text)), el.text_style.align)
+					cursor_x := text_origin + text_w
 					cursor_y := y + el.frame.height * 0.2
 					cursor_h := el.frame.height * 0.6
 					draw_rect(ctx, cursor_x, cursor_y, 2, cursor_h, el.text_style.color, 0)
@@ -2483,6 +2575,56 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		draw_text_in_box(ctx, t, x, y, w, h, style, false)
 	}
 
+	// draw_text_field_selection paints the selected rune range before its text.
+	// The range is derived from the rendered string so secure fields highlight
+	// their bullet characters instead of leaking the underlying value.
+	fn draw_text_field_selection(ctx &gg.Context, display_text string, selection TextSelection, x f64, y f64, w f64, h f64, style TextStyle) {
+		before, selected := text_field_selection_text(display_text, selection)
+		if selected.len == 0 || w <= 0 {
+			return
+		}
+		family := text_font_file(style.font_family, style.bold, style.italic)
+		ensure_family_fallbacks(ctx, family)
+		ctx.set_text_cfg(gg.TextCfg{
+			color: hex_color(style.color)
+			size: int(font_render_size(style.size, text_font_metrics(family)) + 0.5)
+			bold: style.bold
+			italic: style.italic
+			family: family
+			align: text_align(style.align)
+			vertical_align: .middle
+		})
+		text_width := f64(ctx.text_width(display_text))
+		text_origin := text_field_aligned_text_origin(x, w, text_width, style.align)
+		mut left := text_origin + f64(ctx.text_width(before))
+		mut right := left + f64(ctx.text_width(selected))
+		if left < x {
+			left = x
+		}
+		if right > x + w {
+			right = x + w
+		}
+		if right > left {
+			draw_rect(ctx, left, y + h * 0.2, right - left, h * 0.6, 0xb8d7ff, 0)
+		}
+	}
+
+	fn text_field_aligned_text_origin(x f64, w f64, text_width f64, align Align) f64 {
+		return match align {
+			.left { x }
+			.center { x + (w - text_width) / 2 }
+			.right { x + w - text_width }
+		}
+	}
+
+	fn text_field_selection_text(display_text string, selection TextSelection) (string, string) {
+		runes := display_text.runes()
+		start, end := selection.ordered()
+		from := clamp_int(start, 0, runes.len)
+		to := clamp_int(end, from, runes.len)
+		return runes[..from].string(), runes[from..to].string()
+	}
+
 	fn draw_text_in_box(ctx &gg.Context, t string, x f64, y f64, w f64, h f64, style TextStyle, fit bool) {
 		if t.len == 0 {
 			return
diff --git a/ui/ui_scroll_immediate.c.v b/ui/ui_scroll_immediate.c.v
index 5cbf44f..60e8f70 100644
--- a/ui/ui_scroll_immediate.c.v
+++ b/ui/ui_scroll_immediate.c.v
@@ -10,6 +10,11 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 	const text_area_vertical_padding = 8.0
 	const anonymous_text_area_scroll_prefix = '@text-area-key:'
 
+	struct TextAreaLineRange {
+		start int
+		end   int
+	}
+
 	fn reset_scroll_frame() {
 		g_scroll_areas = map[string]Rect{}
 		g_scroll_viewports = map[string]Rect{}
@@ -215,6 +220,118 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		return lines
 	}
 
+	// normalized_text_area_runes returns the renderer's newline-normalized runes
+	// and the corresponding original source offset for every rune boundary.
+	// Keeping this map makes selection offsets correct for CRLF input.
+	fn normalized_text_area_runes(value string) ([]rune, []int) {
+		source := value.runes()
+		mut normalized := []rune{cap: source.len}
+		mut source_offsets := []int{cap: source.len + 1}
+		mut source_index := 0
+		for source_index < source.len {
+			source_offsets << source_index
+			if source[source_index] == `\r` {
+				normalized << `\n`
+				if source_index + 1 < source.len && source[source_index + 1] == `\n` {
+					source_index += 2
+				} else {
+					source_index++
+				}
+			} else {
+				normalized << source[source_index]
+				source_index++
+			}
+		}
+		source_offsets << source.len
+		return normalized, source_offsets
+	}
+
+	// text_area_line_rune_ranges maps rendered wrapped lines back to their
+	// original source rune offsets. Whitespace discarded at wrap points is
+	// intentionally outside every line range.
+	fn text_area_line_rune_ranges(value string, lines []string) []TextAreaLineRange {
+		runes, source_offsets := normalized_text_area_runes(value)
+		mut ranges := []TextAreaLineRange{cap: lines.len}
+		mut cursor := 0
+		for line in lines {
+			line_runes := line.runes()
+			if line_runes.len == 0 {
+				ranges << TextAreaLineRange{
+					start: source_offsets[cursor]
+					end: source_offsets[cursor]
+				}
+				continue
+			}
+			mut start := cursor
+			for candidate := cursor; candidate + line_runes.len <= runes.len; candidate++ {
+				mut matches := true
+				for index in 0 .. line_runes.len {
+					if runes[candidate + index] != line_runes[index] {
+						matches = false
+						break
+					}
+				}
+				if matches {
+					start = candidate
+					break
+				}
+			}
+			end := start + line_runes.len
+			ranges << TextAreaLineRange{
+				start: source_offsets[start]
+				end: source_offsets[end]
+			}
+			cursor = end
+		}
+		return ranges
+	}
+
+	fn focused_text_area_line_index(ranges []TextAreaLineRange, caret int) int {
+		for index, line in ranges {
+			if caret <= line.end {
+				return index
+			}
+		}
+		return ranges.len - 1
+	}
+
+	fn move_focused_text_area_caret(mut editor TextEditor, direction int, extend bool) bool {
+		layout := g_text_area_layouts[g_focused_field] or { return false }
+		if layout.text != editor.text || layout.lines.len == 0 {
+			return false
+		}
+		if !extend && !editor.selection.collapsed() {
+			start, end := editor.selection.ordered()
+			editor.set_caret(if direction < 0 { start } else { end })
+			return true
+		}
+		ranges := text_area_line_rune_ranges(editor.text, layout.lines)
+		if ranges.len == 0 {
+			return false
+		}
+		current := focused_text_area_line_index(ranges, editor.selection.caret)
+		next := clamp_int(current + direction, 0, ranges.len - 1)
+		column := clamp_int(editor.selection.caret - ranges[current].start, 0,
+			ranges[current].end - ranges[current].start)
+		editor.move_caret_to(ranges[next].start + clamp_int(column, 0,
+			ranges[next].end - ranges[next].start), extend)
+		return true
+	}
+
+	fn move_focused_text_area_line_boundary(mut editor TextEditor, end bool, extend bool) bool {
+		layout := g_text_area_layouts[g_focused_field] or { return false }
+		if layout.text != editor.text || layout.lines.len == 0 {
+			return false
+		}
+		ranges := text_area_line_rune_ranges(editor.text, layout.lines)
+		if ranges.len == 0 {
+			return false
+		}
+		line := ranges[focused_text_area_line_index(ranges, editor.selection.caret)]
+		editor.move_caret_to(if end { line.end } else { line.start }, extend)
+		return true
+	}
+
 	fn visible_text_area_rows(count int, top f64, line_height f64, offset f64, clip Rect) (int, int) {
 		if count <= 0 || line_height <= 0 || clip.width <= 0 || clip.height <= 0 {
 			return 0, 0
@@ -243,6 +360,10 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		lines := text_area_lines(el.id, value, content.width, style, cfg.size, fn [ctx] (line string) f64 {
 			return f64(ctx.text_width_f(line))
 		})
+		line_ranges := text_area_line_rune_ranges(value, lines)
+		editor := g_text_editors[el.id] or { text_editor(value.clone()) }
+		selection_start, selection_end := editor.selection.ordered()
+		show_selection := g_focused_field == el.id && selection_start != selection_end
 		line_height := math.max(1.0, font_line_height(style.size))
 		content_height := f64(lines.len) * line_height + text_area_vertical_padding * 2
 		// Read-only means not editable, not unscrollable. disable_scroll only
@@ -261,6 +382,21 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 			first, last := visible_text_area_rows(lines.len, content.y, line_height, offset, text_clip)
 			for index in first .. last {
 				text_y := content.y + (f64(index) + 0.5) * line_height - offset
+				if show_selection && index < line_ranges.len {
+					line_range := line_ranges[index]
+					from := if selection_start > line_range.start { selection_start } else { line_range.start }
+					to := if selection_end < line_range.end { selection_end } else { line_range.end }
+					if to > from {
+						line_runes := lines[index].runes()
+						prefix := line_runes[..from - line_range.start].string()
+						selected := line_runes[from - line_range.start..to - line_range.start].string()
+						line_width := f64(ctx.text_width_f(lines[index]))
+						line_origin := text_field_aligned_text_origin(content.x, content.width, line_width,
+							style.align)
+						draw_rect(ctx, line_origin + f64(ctx.text_width_f(prefix)), text_y - line_height / 2,
+							f64(ctx.text_width_f(selected)), line_height, 0xb8d7ff, 0)
+					}
+				}
 				ctx.draw_text(int(text_x), int(text_y), lines[index], cfg)
 			}
 		}
diff --git a/ui/ui_scroll_immediate_test.v b/ui/ui_scroll_immediate_test.v
index f1a5540..8c7fdb9 100644
--- a/ui/ui_scroll_immediate_test.v
+++ b/ui/ui_scroll_immediate_test.v
@@ -36,7 +36,7 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		scroll_test_events << id
 	}
 
-	fn test_text_area_wraps_words_and_preserves_explicit_blank_lines() {
+fn test_text_area_wraps_words_and_preserves_explicit_blank_lines() {
 		reset_scroll_test_state()
 		assert wrap_text_area_lines('one two three', 70, scroll_test_width) == ['one two', 'three']
 		assert wrap_text_area_lines('one\r\n\r\ntwo\n', 100, scroll_test_width) == ['one', '', 'two', '']
@@ -44,6 +44,19 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		assert wrap_text_area_lines('one\ttwo', 30, scroll_test_width) == ['one', 'two']
 	}
 
+	fn test_page_navigation_scrolls_the_focused_text_area() {
+		reset_scroll_test_state()
+		frame := rect(0, 0, 100, 80)
+		register_scroll_view('notes', frame, frame, 400, true, true, false)
+		g_focused_field = 'notes'
+		page_focused_text_area(1)
+		assert scroll_offset('notes') == 80
+		page_focused_text_area(10)
+		assert scroll_offset('notes') == 320
+		page_focused_text_area(-1)
+		assert scroll_offset('notes') == 240
+	}
+
 	fn test_text_area_wraps_long_words_without_splitting_utf8_bytes() {
 		reset_scroll_test_state()
 		assert wrap_text_area_lines('é界🙂abcd', 30, scroll_test_width) == ['é界🙂', 'abc', 'd']
@@ -271,3 +284,55 @@ $if (android || linux || ((macos || windows) && ui2_custom_rendering ?)) && !ui2
 		assert scroll_hit_test(150, 50) == ''
 	}
 }
+
+fn test_text_area_line_ranges_follow_wrapped_source_runes() {
+	lines := ['one two', 'three']
+	assert text_area_line_rune_ranges('one two three', lines) == [
+		TextAreaLineRange{
+			start: 0
+			end: 7
+		},
+		TextAreaLineRange{
+			start: 8
+			end: 13
+		},
+	]
+}
+
+fn test_text_area_line_ranges_keep_original_crlf_offsets() {
+	assert text_area_line_rune_ranges('a\r\nbc', ['a', 'bc']) == [
+		TextAreaLineRange{
+			start: 0
+			end: 1
+		},
+		TextAreaLineRange{
+			start: 3
+			end: 5
+		},
+	]
+}
+
+fn test_text_area_vertical_and_line_boundary_navigation() {
+	reset_scroll_test_state()
+	g_focused_field = 'notes'
+	g_text_area_layouts['notes'] = TextAreaLayout{
+		text: 'one\ntwo\nthree'
+		lines: ['one', 'two', 'three']
+	}
+	mut editor := text_editor('one\ntwo\nthree')
+	editor.set_caret(6)
+	assert move_focused_text_area_caret(mut editor, 1, false)
+	assert editor.selection.caret == 10
+	assert move_focused_text_area_caret(mut editor, -1, true)
+	assert editor.selection == TextSelection{
+		anchor: 10
+		caret: 6
+	}
+	assert move_focused_text_area_line_boundary(mut editor, false, false)
+	assert editor.selection.caret == 4
+	assert move_focused_text_area_line_boundary(mut editor, true, true)
+	assert editor.selection == TextSelection{
+		anchor: 4
+		caret: 7
+	}
+}