added light mode to site

static/css/main.css

@@ -1,7 +1,28 @@
-/*
- * Dark and Purple Theme
- * Includes a modern CSS reset for cross-browser consistency.
- */
+/* --- Theme Variables and CSS Reset --- */
+
+:root,
+[data-theme="dark"] {
+  --background-color: #1a1a2e;
+  --surface-color: #16213e;
+  --text-color: #e0e0e0;
+  --text-muted-color: #a0a0a0;
+  --text-inverted-color: #ffffff;
+  --border-color: #4f4f7a;
+  --primary-color: #7f5af0;
+  --primary-hover-color: #6a48d7;
+}
+
+[data-theme="light"] {
+  --background-color: #f0f2f5;
+  --surface-color: #ffffff;
+  --text-color: #1c1e21;
+  --text-muted-color: #606770;
+  --text-inverted-color: #ffffff;
+  --border-color: #dddfe2;
+  --primary-color: #7f5af0;
+  --primary-hover-color: #6a48d7;
+}
+
 /* Box-sizing reset */
 *,
 *::before,
@@ -32,12 +53,9 @@ body {
   font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
     Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
     "Segoe UI Symbol";
-  background-color: #1a1a2e;
-  /* Dark blue/purple background */
-  color: #e0e0e0;
-  /* Light text color for contrast */
-  display: grid;
-  place-items: center;
+  background-color: var(--background-color);
+  color: var(--text-color);
+  transition: background-color 0.2s, color 0.2s;
 }
 
 /* Make images responsive */
@@ -47,6 +65,14 @@ picture {
   display: block;
 }
 
+/* General Container for login and dashboard */
+.container {
+  width: 100%;
+  max-width: 960px;
+  margin: 0 auto;
+  padding: 1rem;
+}
+
 /* Login Page Styles */
 .login-container {
   width: 100%;
@@ -57,22 +83,22 @@ picture {
   width: 100%;
   max-width: 400px;
   margin: 0 auto;
+  margin-top: 5vh;
   padding: 2.5rem;
-  background-color: #16213e;
-  /* Slightly lighter dark blue */
+  background-color: var(--surface-color);
   border-radius: 12px;
   box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
   text-align: center;
 }
 
 .login-box h1 {
-  color: #ffffff;
+  color: var(--text-color);
   margin-bottom: 0.5rem;
 }
 
 .login-box p {
   margin-bottom: 2rem;
-  color: #a0a0a0;
+  color: var(--text-muted-color);
 }
 
 .input-group {
@@ -84,16 +110,16 @@ picture {
   display: block;
   margin-bottom: 0.5rem;
   font-size: 0.9rem;
-  color: #c0c0c0;
+  color: var(--text-muted-color);
 }
 
 .input-group input {
   width: 100%;
   padding: 0.75rem 1rem;
-  background-color: #1a1a2e;
-  border: 1px solid #4f4f7a;
+  background-color: var(--background-color);
+  border: 1px solid var(--border-color);
   border-radius: 6px;
-  color: #e0e0e0;
+  color: var(--text-color);
   font-size: 1rem;
 }
 
@@ -102,18 +128,19 @@ picture {
   padding: 0.75rem;
   border: none;
   border-radius: 6px;
-  background-color: #7f5af0;
-  /* Bright purple accent */
-  color: #ffffff;
+  background-color: var(--primary-color);
+  color: var(--text-inverted-color);
   font-size: 1.1rem;
   font-weight: bold;
   cursor: pointer;
   transition: background-color 0.2s ease;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
 }
 
 .btn-primary:hover {
-  background-color: #6a48d7;
-  /* Darker purple on hover */
+  background-color: var(--primary-hover-color);
 }
 
 .login-footer {
@@ -121,7 +148,7 @@ picture {
 }
 
 .login-footer a {
-  color: #7f5af0;
+  color: var(--primary-color);
   text-decoration: none;
   font-size: 0.9rem;
 }
@@ -131,11 +158,20 @@ picture {
 }
 
 /* Header Styles */
+.logo h1 {
+  font-size: 1.5rem;
+  color: var(--text-color);
+}
+.logo {
+  text-decoration: none;
+}
+
 .main-header {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  padding: 1rem 0;
+  padding-bottom: 1rem;
+  border-bottom: 1px solid var(--border-color);
   width: 100%;
   margin-bottom: 2rem;
 }
@@ -149,8 +185,8 @@ picture {
 .logout-btn {
   display: inline-block;
   padding: 0.5rem 1rem;
-  background-color: #7f5af0; /* Same as .btn-primary */
-  color: #ffffff;
+  background-color: var(--primary-color);
+  color: var(--text-inverted-color);
   text-decoration: none;
   border-radius: 6px;
   font-weight: 500;
@@ -158,5 +194,38 @@ picture {
 }
 
 .logout-btn:hover {
-  background-color: #6a48d7; /* Same as .btn-primary:hover */
+  background-color: var(--primary-hover-color);
+}
+
+.theme-btn {
+  background: none;
+  border: none;
+  color: var(--text-color);
+  cursor: pointer;
+  padding: 5px;
+  border-radius: 50%;
+}
+.theme-btn:hover {
+  background-color: var(--surface-color);
+}
+[data-theme="light"] .moon-icon { display: block; }
+[data-theme="light"] .sun-icon { display: none; }
+[data-theme="dark"] .moon-icon { display: none; }
+[data-theme="dark"] .sun-icon { display: block; }
+
+/* Dashboard Card Styles */
+.card {
+  background-color: var(--surface-color);
+  padding: 1.5rem;
+  border-radius: 8px;
+  margin-bottom: 1.5rem;
+  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+}
+.card h2 {
+  margin-top: 0;
+  margin-bottom: 0.5rem;
+}
+.card p {
+  margin-top: 0;
+  color: var(--text-muted-color);
 }