Restyle control header: large centered title, nav below.

Co-authored-by: Cursor <cursoragent@cursor.com>

control/frontend/src/App.tsx

@@ -25,8 +25,13 @@ function Shell({ children }: { children: ReactNode }) {
   return (
     <div className="shell">
       <header className="header">
-        <div className="header-left">
-          <div className="brand">比特骆驼中控</div>
+        <div className="header-top">
+          <div className="header-title-wrap">
+            <div className="header-title">自动化对冲监控系统</div>
+            <div className="header-subtitle">比特骆驼开发定制</div>
+          </div>
+        </div>
+        <div className="header-bar">
           <nav className="nav">
             <NavLink to="/monitor" className={({ isActive }) => (isActive ? "active" : "")}>
               监控区
@@ -38,26 +43,22 @@ function Shell({ children }: { children: ReactNode }) {
               系统设置
             </NavLink>
           </nav>
+          {!lanClient ? (
+            <div className="header-right">
+              <span className="meta">{user}</span>
+              <button
+                type="button"
+                className="btn ghost"
+                onClick={() => {
+                  clearSession();
+                  window.location.href = "/login";
+                }}
+              >
+                退出
+              </button>
+            </div>
+          ) : null}
         </div>
-        <div className="header-center">
-          <div className="header-title">自动化对冲监控系统</div>
-          <div className="header-subtitle">比特骆驼开发定制</div>
-        </div>
-        {!lanClient ? (
-          <div className="header-right">
-            <span className="meta">{user}</span>
-            <button
-              type="button"
-              className="btn ghost"
-              onClick={() => {
-                clearSession();
-                window.location.href = "/login";
-              }}
-            >
-              退出
-            </button>
-          </div>
-        ) : null}
       </header>
       <main className="main">{children}</main>
     </div>

control/frontend/src/styles.css

@@ -47,69 +47,65 @@ body {
 }
 
 .header {
-  position: relative;
   display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 20px;
+  flex-direction: column;
+  align-items: stretch;
+  gap: 14px;
   margin-bottom: 20px;
-  flex-wrap: wrap;
   padding-bottom: 12px;
   border-bottom: 1px solid var(--line);
   box-shadow: 0 1px 0 rgba(0, 200, 255, 0.08);
-  min-height: 52px;
 }
 
-.header-left {
+.header-top {
   display: flex;
+  justify-content: center;
+  align-items: flex-start;
+  padding: 4px 0 2px;
+}
+
+.header-title-wrap {
+  display: flex;
+  flex-direction: column;
   align-items: center;
-  gap: 20px;
-  z-index: 1;
-  min-width: 0;
-}
-
-.brand {
-  font-weight: 700;
-  letter-spacing: 0.08em;
-  font-size: 1.15rem;
-  color: var(--accent);
-  text-shadow: var(--glow);
-  text-transform: none;
-  white-space: nowrap;
-}
-
-.header-center {
-  position: absolute;
-  left: 50%;
-  top: 50%;
-  transform: translate(-50%, -50%);
-  text-align: center;
-  pointer-events: none;
-  z-index: 0;
-  max-width: min(42vw, 360px);
+  width: fit-content;
+  max-width: 100%;
 }
 
 .header-title {
   font-weight: 700;
-  letter-spacing: 0.12em;
-  font-size: 1.2rem;
-  line-height: 1.25;
+  letter-spacing: 0.16em;
+  font-size: clamp(1.55rem, 2.8vw, 2.05rem);
+  line-height: 1.2;
   color: var(--accent);
   text-shadow: var(--glow);
   white-space: nowrap;
+  text-align: center;
 }
 
 .header-subtitle {
-  margin-top: 2px;
-  font-size: 0.72rem;
-  letter-spacing: 0.18em;
+  align-self: flex-end;
+  margin-top: 4px;
+  margin-right: -0.4em;
+  padding-left: 2.5em;
+  font-size: 0.78rem;
+  letter-spacing: 0.2em;
   color: var(--muted);
   white-space: nowrap;
 }
 
+.header-bar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  flex-wrap: wrap;
+}
+
 .nav {
   display: flex;
   gap: 8px;
+  flex-wrap: wrap;
 }
 
 .nav a {
@@ -133,23 +129,10 @@ body {
   display: flex;
   align-items: center;
   gap: 10px;
-  z-index: 1;
   margin-left: auto;
   flex-shrink: 0;
 }
 
-@media (max-width: 900px) {
-  .header-center {
-    position: static;
-    transform: none;
-    order: 3;
-    width: 100%;
-    max-width: none;
-    margin-top: 4px;
-    pointer-events: auto;
-  }
-}
-
 .main h2 {
   margin: 0 0 8px;
   font-size: 1.25rem;