diff --git a/style.css b/style.css
index e18cce9..a5ab53d 100644
--- a/style.css
+++ b/style.css
@@ -134,15 +134,16 @@ body {
 
 /* Header */
 header {
-    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
-    color: #fff;
+    background: #fff;
+    color: var(--primary-color);
     padding: 1rem 2rem;
     display: flex;
     justify-content: space-between;
     align-items: center;
     flex-wrap: wrap;
     gap: 0.5rem;
-    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
+    box-shadow: 0 1px 6px rgba(0,0,0,0.1);
+    border-bottom: 2px solid var(--primary-color);
     position: sticky;
     top: 0;
     z-index: 100;
@@ -157,16 +158,19 @@ header {
 .brand-icon {
     font-size: 1.8rem;
     line-height: 1;
+    color: var(--primary-color);
 }
 
 .header-left h1 {
     font-size: 1.3rem;
     letter-spacing: -0.3px;
+    color: var(--primary-color);
 }
 
 .subtitle {
     font-size: 0.8rem;
-    opacity: 0.7;
+    opacity: 0.6;
+    color: #555;
 }
 
 .header-right {
@@ -185,7 +189,8 @@ header {
 
 .user-info {
     font-size: 0.85rem;
-    opacity: 0.8;
+    opacity: 0.7;
+    color: #555;
     padding-right: 0.5rem;
     border-right: 1px solid rgba(255,255,255,0.2);
 }
@@ -503,8 +508,8 @@ footer {
 
 .btn-secondary {
     background: transparent;
-    color: #fff;
-    border: 2px solid rgba(255,255,255,0.3);
+    color: var(--primary-color);
+    border: 2px solid var(--primary-color);
     padding: 8px 18px;
     border-radius: 8px;
     cursor: pointer;
@@ -513,8 +518,8 @@ footer {
 }
 
 .btn-secondary:hover {
-    border-color: #fff;
-    background: rgba(255,255,255,0.1);
+    background: var(--primary-color);
+    color: #fff;
 }
 
 .btn-danger {