feat(hugo): 调整 Logo 大小为 64x64，增强标题样式，丰富网页配色

site/static/css/site.css

@@ -10,13 +10,19 @@
   --border: rgba(45,42,38,0.08);
   --pink-soft: #f7f1f2;
   --cream-soft: #fef9f3;
+  /* 新增协调色 */
+  --pink-warm: #f4d4d9;
+  --pink-soft-2: #f9e7eb;
+  --green-soft: #d4e8e3;
+  --green-warm: #c8e6d9;
 }
 * { box-sizing: border-box; }
 body {
   margin: 0;
   background:
-    radial-gradient(circle at top right, rgba(156, 124, 117, 0.08), transparent 35%),
-    radial-gradient(circle at bottom left, rgba(122, 139, 156, 0.06), transparent 30%),
+    radial-gradient(circle at top right, var(--pink-warm) 0, transparent 40%),
+    radial-gradient(circle at bottom left, var(--green-soft) 0, transparent 35%),
+    radial-gradient(circle at top left, rgba(156, 124, 117, 0.08), transparent 35%),
     var(--bg);
   color: var(--text);
   font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
@@ -34,14 +40,24 @@ a:hover { text-decoration: underline; }
   align-items: center;
   gap: 12px;
   font-family: "Noto Serif SC", "Source Han Serif CN", "Songti SC", "SimSun", serif;
-  font-size: 1.4rem;
-  font-weight: 700;
+  font-size: 1.6rem;
+  font-weight: 800;
   color: var(--text);
   letter-spacing: -0.02em;
+  text-shadow: 1px 1px 2px rgba(156, 124, 117, 0.15);
+}
+.site-title a {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  text-decoration: none;
+}
+.site-title a:hover {
+  color: var(--accent);
 }
 .site-logo {
-  width: 24px;
-  height: 24px;
+  width: 64px;
+  height: 64px;
   border-radius: 50%;
   object-fit: cover;
 }
@@ -50,7 +66,7 @@ a:hover { text-decoration: underline; }
 .site-nav a { color: var(--text); font-weight: 500; }
 main.wrap { padding: 32px 0 48px; }
 .card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 24px; box-shadow: 0 4px 16px rgba(45,42,38,0.04); }
-.hero { padding: 28px 24px; margin-bottom: 24px; background: linear-gradient(135deg, var(--pink-soft) 0%, var(--cream-soft) 100%); border: 1px solid var(--border); }
+.hero { padding: 28px 24px; margin-bottom: 24px; background: linear-gradient(135deg, var(--pink-soft-2) 0%, var(--green-soft) 100%); border: 1px solid var(--border); }
 .hero h1 {
   font-family: "Noto Serif SC", "Source Han Serif CN", "Songti SC", "SimSun", serif;
   font-size: 1.8rem;