From d5e48172881e65a6c6619eec21cc40b127f54220 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Sat, 24 Jan 2026 12:03:26 +0000
Subject: [PATCH] Add visualization_tool/css/theme.css

---
 visualization_tool/css/theme.css | 123 +++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 visualization_tool/css/theme.css

diff --git a/visualization_tool/css/theme.css b/visualization_tool/css/theme.css
new file mode 100644
index 0000000..5e219d4
--- /dev/null
+++ b/visualization_tool/css/theme.css
@@ -0,0 +1,123 @@
+:root {
+  /* Farb- und Layout-Variablen */
+  --color-primary: #0066cc;
+  --color-secondary: #3399ff;
+  --color-accent: #ff9900;
+  --color-bg: #ffffff;
+  --color-text: #222222;
+  --color-muted: #666666;
+  --color-border: #cccccc;
+
+  --color-bg-dark: #1a1a1a;
+  --color-text-dark: #f0f0f0;
+  --color-muted-dark: #999999;
+  --color-border-dark: #444444;
+
+  --spacing-sm: 0.5rem;
+  --spacing-md: 1rem;
+  --spacing-lg: 2rem;
+
+  --radius-sm: 4px;
+  --radius-md: 8px;
+
+  --transition-fast: 0.2s ease-in-out;
+}
+
+/* ======================================== */
+/* Light Theme */
+/* ======================================== */
+body.light-mode {
+  background-color: var(--color-bg);
+  color: var(--color-text);
+  transition: background-color var(--transition-fast), color var(--transition-fast);
+}
+
+body.light-mode a {
+  color: var(--color-primary);
+}
+
+body.light-mode a:hover,
+body.light-mode a:focus {
+  color: var(--color-accent);
+}
+
+body.light-mode .visualization_tool__card {
+  background-color: #fafafa;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
+}
+
+body.light-mode .visualization_tool__header {
+  background-color: var(--color-secondary);
+  color: #fff;
+}
+
+body.light-mode .visualization_tool__table th,
+body.light-mode .visualization_tool__table td {
+  border-bottom: 1px solid var(--color-border);
+}
+
+/* ======================================== */
+/* Dark Theme */
+/* ======================================== */
+body.dark-mode {
+  background-color: var(--color-bg-dark);
+  color: var(--color-text-dark);
+  transition: background-color var(--transition-fast), color var(--transition-fast);
+}
+
+body.dark-mode a {
+  color: var(--color-secondary);
+}
+
+body.dark-mode a:hover,
+body.dark-mode a:focus {
+  color: var(--color-accent);
+}
+
+body.dark-mode .visualization_tool__card {
+  background-color: #2a2a2a;
+  border: 1px solid var(--color-border-dark);
+  border-radius: var(--radius-md);
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
+}
+
+body.dark-mode .visualization_tool__header {
+  background-color: var(--color-primary);
+  color: #fff;
+}
+
+body.dark-mode .visualization_tool__table th,
+body.dark-mode .visualization_tool__table td {
+  border-bottom: 1px solid var(--color-border-dark);
+}
+
+/* ======================================== */
+/* Accessibility: High Contrast Focus States */
+/* ======================================== */
+:focus-visible {
+  outline: 3px solid var(--color-accent);
+  outline-offset: 2px;
+}
+
+/* ======================================== */
+/* Footer */
+/* ======================================== */
+footer {
+  margin-top: var(--spacing-lg);
+  padding: var(--spacing-md);
+  text-align: center;
+  font-size: 0.875rem;
+  color: var(--color-muted);
+}
+
+body.dark-mode footer {
+  color: var(--color-muted-dark);
+}
+
+footer::after {
+  content: "© 2026 Donau2Space.de";
+  display: block;
+  margin-top: var(--spacing-sm);
+}
\ No newline at end of file