diff --git a/index.html b/index.html
index db82ae5..a4eaf2b 100644
--- a/index.html
+++ b/index.html
@@ -7,29 +7,41 @@
 <script src="https://cdn.jsdelivr.net/npm/pptxgenjs@3.12.0/dist/pptxgen.bundle.js"></script>
 <style>
   * { margin: 0; box-sizing: border-box; }
-  body { font-family: -apple-system, "Segoe UI", Roboto, sans-serif; background: #0f1218; color: #f4f4f5; }
+  body { font-family: "Segoe UI", "Roboto", Arial, sans-serif; background: #ffffff; color: #1a1a1a; }
   .slide { display: none; min-height: 100vh; padding: 6vh 8vw; flex-direction: column; justify-content: flex-start; }
   .slide.on { display: flex; }
-  .slide h1 { font-size: clamp(28px, 5vw, 52px); margin-bottom: 20px; color: #00b8cc; }
-  .slide h2 { font-size: clamp(22px, 4vw, 38px); margin-bottom: 16px; color: #00b8cc; }
+  .slide h1 { font-size: clamp(28px, 5vw, 52px); margin-bottom: 20px; color: #0056b3; font-weight: 700; }
+  .slide h2 { font-size: clamp(22px, 4vw, 38px); margin-bottom: 16px; color: #0056b3; font-weight: 600; }
   .slide li { font-size: clamp(16px, 2.4vw, 24px); line-height: 1.5; margin-bottom: 8px; list-style: none; padding-left: 24px; position: relative; }
-  .slide li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; border-radius: 3px; background: #00b8cc; }
-  .num { position: fixed; bottom: 18px; right: 22px; color: #8a8a92; font-size: 14px; }
+  .slide li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; border-radius: 3px; background: #0056b3; }
+  .num { position: fixed; bottom: 18px; right: 22px; color: #666; font-size: 14px; }
   .nav { position: fixed; bottom: 14px; left: 22px; display: flex; gap: 8px; flex-wrap: wrap; max-width: 80vw; }
-  .nav button { border: 1px solid #333; background: #171719; color: #f4f4f5; border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 14px; }
-  .nav .pptx { border-color: #00b8cc; color: #9beeff; }
-  .nav .refresh { border-color: #10b981; color: #6ee7b7; }
+  .nav button { border: 1px solid #ddd; background: #f5f5f5; color: #333; border-radius: 6px; padding: 8px 14px; cursor: pointer; font-size: 14px; }
+  .nav .pptx { border-color: #0056b3; color: #0056b3; background: #e8f0fe; }
+  .nav .refresh { border-color: #28a745; color: #28a745; background: #e8f5e9; }
   .metric-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 20px; }
-  .metric-card { background: #1a1d24; border-radius: 10px; padding: 20px; border: 1px solid #2a2f3a; }
-  .metric-card h3 { font-size: 14px; color: #8a8a92; margin-bottom: 6px; }
-  .metric-card .value { font-size: clamp(24px, 3.5vw, 36px); font-weight: bold; color: #00b8cc; }
-  .metric-card .sub { font-size: 13px; color: #6a6a72; margin-top: 4px; }
-  .chart-placeholder { background: #1a1d24; border-radius: 12px; padding: 30px; text-align: center; margin: 16px 0; border: 1px solid #2a2f3a; }
-  .bar-row { display: flex; align-items: center; margin: 10px 0; }
-  .bar-label { width: 180px; font-size: 12px; color: #a1a1aa; }
-  .bar-container { flex: 1; background: #2a2f3a; border-radius: 4px; height: 22px; overflow: hidden; }
-  .bar { height: 100%; background: linear-gradient(90deg, #00b8cc, #0ea5e9); border-radius: 4px; transition: width 0.3s; }
-  .bar-value { margin-left: 10px; font-size: 13px; color: #00b8cc; min-width: 70px; text-align: right; font-weight: 600; }
+  .metric-card { background: #f8f9fa; border-radius: 8px; padding: 20px; border: 1px solid #e9ecef; }
+  .metric-card h3 { font-size: 14px; color: #6c757d; margin-bottom: 6px; }
+  .metric-card .value { font-size: clamp(24px, 3.5vw, 36px); font-weight: bold; color: #0056b3; }
+  .metric-card .sub { font-size: 13px; color: #6c757d; margin-top: 4px; }
+  .chart-placeholder { background: #f8f9fa; border-radius: 8px; padding: 30px; text-align: center; margin: 16px 0; border: 1px solid #e9ecef; }
+  .bar-row { display: flex; align-items: center; margin: 8px 0; }
+  .bar-label { width: 180px; font-size: 13px; color: #495057; }
+  .bar-container { flex: 1; background: #e9ecef; border-radius: 3px; height: 20px; overflow: hidden; }
+  .bar { height: 100%; background: linear-gradient(90deg, #0056b3, #007bff); border-radius: 3px; transition: width 0.3s; }
+  .bar-value { margin-left: 10px; font-size: 13px; color: #0056b3; min-width: 70px; text-align: right; font-weight: 600; }
+  .file-input { margin: 16px 0; }
+  .file-input input { display: none; }
+  .file-input label { display: inline-block; padding: 8px 16px; background: #0056b3; color: #fff; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 14px; }
+  .file-input label:hover { background: #004494; }
+  .rdt-section { margin: 20px 0; }
+  .rdt-title { font-size: 16px; color: #0056b3; margin: 14px 0 8px 0; font-weight: 600; }
+  .tariff-row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid #e9ecef; font-size: 13px; }
+  .tariff-row:last-child { border-bottom: none; }
+  .tariff-name { color: #495057; }
+  .tariff-val { color: #0056b3; font-weight: 600; }
+  .summary-box { background: #f8f9fa; border: 1px solid #0056b3; border-radius: 8px; padding: 20px; margin: 16px 0; }
+  .summary-box h3 { color: #0056b3; margin-bottom: 12px; font-size: 18px; }
   .file-input { margin: 16px 0; }
   .file-input input { display: none; }
   .file-input label { display: inline-block; padding: 8px 16px; background: #00b8cc; color: #0f1218; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 14px; }