diff --git a/README.md b/README.md
index 6b9137b..f0d9eaf 100644
--- a/README.md
+++ b/README.md
@@ -142,12 +142,20 @@ API credentials are optional — needed for Gelbooru and rate-limited sites.
 
 ## Theming
 
-The app uses your OS native theme by default. To customize, create `custom.qss` in your data directory:
+The app uses your OS native theme by default. To customize, copy a `.qss` file from the [`themes/`](themes/) folder to your data directory as `custom.qss`:
 
 - **Linux**: `~/.local/share/booru-viewer/custom.qss`
 - **Windows**: `%APPDATA%\booru-viewer\custom.qss`
 
-A template is available in Settings > Theme > Create from Template.
+A template is also available in Settings > Theme > Create from Template.
+
+### Included Themes
+
+<picture><img src="screenshots/themes/nord.png" alt="Nord" width="400"></picture> <picture><img src="screenshots/themes/catppuccin-mocha.png" alt="Catppuccin Mocha" width="400"></picture>
+
+<picture><img src="screenshots/themes/gruvbox.png" alt="Gruvbox" width="400"></picture> <picture><img src="screenshots/themes/solarized-dark.png" alt="Solarized Dark" width="400"></picture>
+
+<picture><img src="screenshots/themes/tokyo-night.png" alt="Tokyo Night" width="400"></picture>
 
 ## Settings
 
diff --git a/screenshots/themes/catppuccin-mocha.png b/screenshots/themes/catppuccin-mocha.png
new file mode 100644
index 0000000..2bf8de4
Binary files /dev/null and b/screenshots/themes/catppuccin-mocha.png differ
diff --git a/screenshots/themes/gruvbox.png b/screenshots/themes/gruvbox.png
new file mode 100644
index 0000000..a0d6a28
Binary files /dev/null and b/screenshots/themes/gruvbox.png differ
diff --git a/screenshots/themes/nord.png b/screenshots/themes/nord.png
new file mode 100644
index 0000000..edd474a
Binary files /dev/null and b/screenshots/themes/nord.png differ
diff --git a/screenshots/themes/solarized-dark.png b/screenshots/themes/solarized-dark.png
new file mode 100644
index 0000000..646e769
Binary files /dev/null and b/screenshots/themes/solarized-dark.png differ
diff --git a/screenshots/themes/tokyo-night.png b/screenshots/themes/tokyo-night.png
new file mode 100644
index 0000000..f0e0480
Binary files /dev/null and b/screenshots/themes/tokyo-night.png differ
diff --git a/themes/catppuccin-mocha.qss b/themes/catppuccin-mocha.qss
new file mode 100644
index 0000000..00ae173
--- /dev/null
+++ b/themes/catppuccin-mocha.qss
@@ -0,0 +1,119 @@
+/* booru-viewer — Catppuccin Mocha */
+
+QWidget {
+    background-color: #1e1e2e;
+    color: #cdd6f4;
+    font-size: 13px;
+}
+
+QPushButton {
+    background-color: #313244;
+    color: #cdd6f4;
+    border: 1px solid #45475a;
+    border-radius: 6px;
+    padding: 5px 14px;
+}
+QPushButton:hover {
+    background-color: #45475a;
+    border-color: #cba6f7;
+}
+QPushButton:pressed {
+    background-color: #585b70;
+}
+QPushButton:checked {
+    background-color: #cba6f7;
+    color: #1e1e2e;
+    border-color: #cba6f7;
+}
+
+QLineEdit, QSpinBox, QComboBox {
+    background-color: #313244;
+    color: #cdd6f4;
+    border: 1px solid #45475a;
+    border-radius: 6px;
+    padding: 4px 8px;
+    selection-background-color: #cba6f7;
+    selection-color: #1e1e2e;
+}
+QLineEdit:focus, QSpinBox:focus {
+    border-color: #cba6f7;
+}
+
+QComboBox::drop-down {
+    border: none;
+    width: 20px;
+}
+QComboBox QAbstractItemView {
+    background-color: #313244;
+    color: #cdd6f4;
+    border: 1px solid #45475a;
+    selection-background-color: #45475a;
+}
+
+QScrollBar:vertical {
+    background: #1e1e2e;
+    width: 10px;
+    border: none;
+}
+QScrollBar::handle:vertical {
+    background: #585b70;
+    border-radius: 4px;
+    min-height: 20px;
+}
+QScrollBar::handle:vertical:hover { background: #cba6f7; }
+QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical { height: 0; }
+
+QScrollBar:horizontal {
+    background: #1e1e2e;
+    height: 10px;
+}
+QScrollBar::handle:horizontal {
+    background: #585b70;
+    border-radius: 4px;
+}
+QScrollBar::add-line:horizontal, QScrollBar::sub-line:horizontal { width: 0; }
+
+QMenuBar, QMenu {
+    background-color: #1e1e2e;
+    color: #cdd6f4;
+    border: 1px solid #313244;
+}
+QMenu::item:selected {
+    background-color: #45475a;
+}
+
+QStatusBar {
+    background-color: #1e1e2e;
+    color: #a6adc8;
+}
+
+QSplitter::handle {
+    background: #45475a;
+    width: 2px;
+}
+
+QLabel { background: transparent; }
+
+QSlider::groove:horizontal {
+    background: #313244;
+    height: 4px;
+    border-radius: 2px;
+}
+QSlider::handle:horizontal {
+    background: #cba6f7;
+    width: 12px;
+    margin: -4px 0;
+    border-radius: 6px;
+}
+
+QTabBar::tab {
+    background: #313244;
+    color: #cdd6f4;
+    border: 1px solid #45475a;
+    padding: 6px 16px;
+    border-radius: 4px 4px 0 0;
+}
+QTabBar::tab:selected {
+    background: #45475a;
+    color: #cba6f7;
+}
diff --git a/themes/gruvbox.qss b/themes/gruvbox.qss
new file mode 100644
index 0000000..6ad7576
--- /dev/null
+++ b/themes/gruvbox.qss
@@ -0,0 +1,116 @@
+/* booru-viewer — Gruvbox Dark */
+
+QWidget {
+    background-color: #282828;
+    color: #ebdbb2;
+    font-size: 13px;
+}
+
+QPushButton {
+    background-color: #3c3836;
+    color: #ebdbb2;
+    border: 1px solid #504945;
+    border-radius: 4px;
+    padding: 5px 14px;
+}
+QPushButton:hover {
+    background-color: #504945;
+    border-color: #fe8019;
+}
+QPushButton:pressed {
+    background-color: #fe8019;
+    color: #282828;
+}
+QPushButton:checked {
+    background-color: #fe8019;
+    color: #282828;
+    border-color: #fe8019;
+}
+
+QLineEdit, QSpinBox, QComboBox, QTextEdit {
+    background-color: #3c3836;
+    color: #ebdbb2;
+    border: 1px solid #504945;
+    border-radius: 4px;
+    padding: 4px 8px;
+    selection-background-color: #fe8019;
+    selection-color: #282828;
+}
+QLineEdit:focus, QSpinBox:focus, QTextEdit:focus {
+    border-color: #fe8019;
+}
+
+QComboBox::drop-down { border: none; width: 20px; }
+QComboBox QAbstractItemView {
+    background-color: #3c3836;
+    color: #ebdbb2;
+    border: 1px solid #504945;
+    selection-background-color: #504945;
+}
+
+QScrollBar:vertical {
+    background: #282828;
+    width: 10px;
+    border: none;
+}
+QScrollBar::handle:vertical {
+    background: #665c54;
+    border-radius: 4px;
+    min-height: 20px;
+}
+QScrollBar::handle:vertical:hover { background: #fe8019; }
+QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical { height: 0; }
+
+QScrollBar:horizontal {
+    background: #282828;
+    height: 10px;
+}
+QScrollBar::handle:horizontal {
+    background: #665c54;
+    border-radius: 4px;
+}
+QScrollBar::add-line:horizontal, QScrollBar::sub-line:horizontal { width: 0; }
+
+QMenuBar, QMenu {
+    background-color: #282828;
+    color: #ebdbb2;
+    border: 1px solid #3c3836;
+}
+QMenu::item:selected {
+    background-color: #504945;
+}
+
+QStatusBar {
+    background-color: #282828;
+    color: #a89984;
+}
+
+QSplitter::handle {
+    background: #504945;
+    width: 2px;
+}
+
+QLabel { background: transparent; }
+
+QSlider::groove:horizontal {
+    background: #3c3836;
+    height: 4px;
+    border-radius: 2px;
+}
+QSlider::handle:horizontal {
+    background: #fe8019;
+    width: 12px;
+    margin: -4px 0;
+    border-radius: 6px;
+}
+
+QTabBar::tab {
+    background: #3c3836;
+    color: #ebdbb2;
+    border: 1px solid #504945;
+    padding: 6px 16px;
+}
+QTabBar::tab:selected {
+    background: #504945;
+    color: #fe8019;
+}
diff --git a/themes/nord.qss b/themes/nord.qss
new file mode 100644
index 0000000..6a9823c
--- /dev/null
+++ b/themes/nord.qss
@@ -0,0 +1,119 @@
+/* booru-viewer — Nord */
+
+QWidget {
+    background-color: #2e3440;
+    color: #d8dee9;
+    font-size: 13px;
+}
+
+QPushButton {
+    background-color: #3b4252;
+    color: #d8dee9;
+    border: 1px solid #4c566a;
+    border-radius: 4px;
+    padding: 5px 14px;
+}
+QPushButton:hover {
+    background-color: #434c5e;
+    border-color: #88c0d0;
+}
+QPushButton:pressed {
+    background-color: #4c566a;
+}
+QPushButton:checked {
+    background-color: #5e81ac;
+    color: #eceff4;
+    border-color: #5e81ac;
+}
+
+QLineEdit, QSpinBox, QComboBox {
+    background-color: #3b4252;
+    color: #eceff4;
+    border: 1px solid #4c566a;
+    border-radius: 4px;
+    padding: 4px 8px;
+    selection-background-color: #5e81ac;
+    selection-color: #eceff4;
+}
+QLineEdit:focus, QSpinBox:focus {
+    border-color: #88c0d0;
+}
+
+QComboBox::drop-down {
+    border: none;
+    width: 20px;
+}
+QComboBox QAbstractItemView {
+    background-color: #3b4252;
+    color: #d8dee9;
+    border: 1px solid #4c566a;
+    selection-background-color: #434c5e;
+}
+
+QScrollBar:vertical {
+    background: #2e3440;
+    width: 10px;
+    border: none;
+}
+QScrollBar::handle:vertical {
+    background: #4c566a;
+    border-radius: 4px;
+    min-height: 20px;
+}
+QScrollBar::handle:vertical:hover { background: #5e81ac; }
+QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical { height: 0; }
+
+QScrollBar:horizontal {
+    background: #2e3440;
+    height: 10px;
+}
+QScrollBar::handle:horizontal {
+    background: #4c566a;
+    border-radius: 4px;
+}
+QScrollBar::add-line:horizontal, QScrollBar::sub-line:horizontal { width: 0; }
+
+QMenuBar, QMenu {
+    background-color: #2e3440;
+    color: #d8dee9;
+    border: 1px solid #3b4252;
+}
+QMenu::item:selected {
+    background-color: #434c5e;
+}
+
+QStatusBar {
+    background-color: #2e3440;
+    color: #81a1c1;
+}
+
+QSplitter::handle {
+    background: #4c566a;
+    width: 2px;
+}
+
+QLabel { background: transparent; }
+
+QSlider::groove:horizontal {
+    background: #3b4252;
+    height: 4px;
+    border-radius: 2px;
+}
+QSlider::handle:horizontal {
+    background: #88c0d0;
+    width: 12px;
+    margin: -4px 0;
+    border-radius: 6px;
+}
+
+QTabBar::tab {
+    background: #3b4252;
+    color: #d8dee9;
+    border: 1px solid #4c566a;
+    padding: 6px 16px;
+}
+QTabBar::tab:selected {
+    background: #434c5e;
+    color: #88c0d0;
+    border-bottom-color: #88c0d0;
+}
diff --git a/themes/solarized-dark.qss b/themes/solarized-dark.qss
new file mode 100644
index 0000000..2ba246a
--- /dev/null
+++ b/themes/solarized-dark.qss
@@ -0,0 +1,116 @@
+/* booru-viewer — Solarized Dark */
+
+QWidget {
+    background-color: #002b36;
+    color: #839496;
+    font-size: 13px;
+}
+
+QPushButton {
+    background-color: #073642;
+    color: #93a1a1;
+    border: 1px solid #586e75;
+    border-radius: 4px;
+    padding: 5px 14px;
+}
+QPushButton:hover {
+    background-color: #586e75;
+    color: #fdf6e3;
+}
+QPushButton:pressed {
+    background-color: #268bd2;
+    color: #fdf6e3;
+}
+QPushButton:checked {
+    background-color: #268bd2;
+    color: #fdf6e3;
+    border-color: #268bd2;
+}
+
+QLineEdit, QSpinBox, QComboBox, QTextEdit {
+    background-color: #073642;
+    color: #93a1a1;
+    border: 1px solid #586e75;
+    border-radius: 4px;
+    padding: 4px 8px;
+    selection-background-color: #268bd2;
+    selection-color: #fdf6e3;
+}
+QLineEdit:focus, QSpinBox:focus, QTextEdit:focus {
+    border-color: #268bd2;
+}
+
+QComboBox::drop-down { border: none; width: 20px; }
+QComboBox QAbstractItemView {
+    background-color: #073642;
+    color: #93a1a1;
+    border: 1px solid #586e75;
+    selection-background-color: #586e75;
+}
+
+QScrollBar:vertical {
+    background: #002b36;
+    width: 10px;
+    border: none;
+}
+QScrollBar::handle:vertical {
+    background: #586e75;
+    border-radius: 4px;
+    min-height: 20px;
+}
+QScrollBar::handle:vertical:hover { background: #268bd2; }
+QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical { height: 0; }
+
+QScrollBar:horizontal {
+    background: #002b36;
+    height: 10px;
+}
+QScrollBar::handle:horizontal {
+    background: #586e75;
+    border-radius: 4px;
+}
+QScrollBar::add-line:horizontal, QScrollBar::sub-line:horizontal { width: 0; }
+
+QMenuBar, QMenu {
+    background-color: #002b36;
+    color: #839496;
+    border: 1px solid #073642;
+}
+QMenu::item:selected {
+    background-color: #073642;
+}
+
+QStatusBar {
+    background-color: #002b36;
+    color: #586e75;
+}
+
+QSplitter::handle {
+    background: #586e75;
+    width: 2px;
+}
+
+QLabel { background: transparent; }
+
+QSlider::groove:horizontal {
+    background: #073642;
+    height: 4px;
+    border-radius: 2px;
+}
+QSlider::handle:horizontal {
+    background: #268bd2;
+    width: 12px;
+    margin: -4px 0;
+    border-radius: 6px;
+}
+
+QTabBar::tab {
+    background: #073642;
+    color: #839496;
+    border: 1px solid #586e75;
+    padding: 6px 16px;
+}
+QTabBar::tab:selected {
+    background: #586e75;
+    color: #fdf6e3;
+}
diff --git a/themes/tokyo-night.qss b/themes/tokyo-night.qss
new file mode 100644
index 0000000..5ed7858
--- /dev/null
+++ b/themes/tokyo-night.qss
@@ -0,0 +1,116 @@
+/* booru-viewer — Tokyo Night */
+
+QWidget {
+    background-color: #1a1b26;
+    color: #a9b1d6;
+    font-size: 13px;
+}
+
+QPushButton {
+    background-color: #24283b;
+    color: #a9b1d6;
+    border: 1px solid #3b4261;
+    border-radius: 4px;
+    padding: 5px 14px;
+}
+QPushButton:hover {
+    background-color: #3b4261;
+    border-color: #7aa2f7;
+}
+QPushButton:pressed {
+    background-color: #7aa2f7;
+    color: #1a1b26;
+}
+QPushButton:checked {
+    background-color: #7aa2f7;
+    color: #1a1b26;
+    border-color: #7aa2f7;
+}
+
+QLineEdit, QSpinBox, QComboBox, QTextEdit {
+    background-color: #24283b;
+    color: #a9b1d6;
+    border: 1px solid #3b4261;
+    border-radius: 4px;
+    padding: 4px 8px;
+    selection-background-color: #7aa2f7;
+    selection-color: #1a1b26;
+}
+QLineEdit:focus, QSpinBox:focus, QTextEdit:focus {
+    border-color: #7aa2f7;
+}
+
+QComboBox::drop-down { border: none; width: 20px; }
+QComboBox QAbstractItemView {
+    background-color: #24283b;
+    color: #a9b1d6;
+    border: 1px solid #3b4261;
+    selection-background-color: #3b4261;
+}
+
+QScrollBar:vertical {
+    background: #1a1b26;
+    width: 10px;
+    border: none;
+}
+QScrollBar::handle:vertical {
+    background: #3b4261;
+    border-radius: 4px;
+    min-height: 20px;
+}
+QScrollBar::handle:vertical:hover { background: #7aa2f7; }
+QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical { height: 0; }
+
+QScrollBar:horizontal {
+    background: #1a1b26;
+    height: 10px;
+}
+QScrollBar::handle:horizontal {
+    background: #3b4261;
+    border-radius: 4px;
+}
+QScrollBar::add-line:horizontal, QScrollBar::sub-line:horizontal { width: 0; }
+
+QMenuBar, QMenu {
+    background-color: #1a1b26;
+    color: #a9b1d6;
+    border: 1px solid #24283b;
+}
+QMenu::item:selected {
+    background-color: #3b4261;
+}
+
+QStatusBar {
+    background-color: #1a1b26;
+    color: #565f89;
+}
+
+QSplitter::handle {
+    background: #3b4261;
+    width: 2px;
+}
+
+QLabel { background: transparent; }
+
+QSlider::groove:horizontal {
+    background: #24283b;
+    height: 4px;
+    border-radius: 2px;
+}
+QSlider::handle:horizontal {
+    background: #7aa2f7;
+    width: 12px;
+    margin: -4px 0;
+    border-radius: 6px;
+}
+
+QTabBar::tab {
+    background: #24283b;
+    color: #a9b1d6;
+    border: 1px solid #3b4261;
+    padding: 6px 16px;
+}
+QTabBar::tab:selected {
+    background: #3b4261;
+    color: #7aa2f7;
+}