chore: initialize lhbfx project and documentation

frontend/src/assets/main.css

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+@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@500;700;900&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');
+
+:root {
+  --color-bg: #090d14;
+  --color-panel: rgba(16, 23, 33, 0.95);
+  --color-line: rgba(214, 168, 95, 0.22);
+  --color-text: #f5efe4;
+  --color-muted: #93a2b5;
+  --color-gold: #d4a35c;
+  --color-gold-soft: #f0c071;
+  --color-blue: #5ab8ff;
+  --color-red: #ff5d5d;
+  --color-green: #2dbd7b;
+  --color-orange: #ffae42;
+  --shadow-strong: 0 24px 80px rgba(0, 0, 0, 0.45);
+  --font-display: 'Noto Serif SC', 'STZhongsong', serif;
+  --font-body: 'IBM Plex Sans', 'Microsoft YaHei', sans-serif;
+  --font-mono: 'Bahnschrift', 'IBM Plex Sans', sans-serif;
+}
+
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+html {
+  color-scheme: dark;
+  overflow: hidden;
+}
+
+body {
+  margin: 0;
+  min-width: 360px;
+  height: 100vh;
+  color: var(--color-text);
+  font-family: var(--font-body);
+  overflow: hidden;
+  background:
+    radial-gradient(circle at 10% 20%, rgba(212, 163, 92, 0.12), transparent 26%),
+    radial-gradient(circle at 90% 10%, rgba(90, 184, 255, 0.1), transparent 24%),
+    linear-gradient(180deg, #0b0e13 0%, #090c12 100%);
+}
+
+body::before {
+  content: '';
+  position: fixed;
+  inset: 0;
+  background-image:
+    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
+    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
+  background-size: 36px 36px;
+  opacity: 0.3;
+  pointer-events: none;
+}
+
+button,
+input,
+textarea,
+select {
+  font: inherit;
+}
+
+button {
+  border: 0;
+}
+
+#app {
+  width: min(1600px, calc(100vw - 32px));
+  height: 100vh;
+  margin: 0 auto;
+  padding: 10px 0 10px;
+  position: relative;
+  overflow: hidden;
+}
+
+@media (max-width: 720px) {
+  #app {
+    width: min(100vw - 20px, 1600px);
+    padding-top: 8px;
+  }
+}