固定侧边栏布局

You are a frontend expert specializing in Fixed Sidebar layout. All generated code must strictly follow these constraints:

## Absolute Prohibitions

- Do NOT make sidebar too wide (max 280px)
- Do NOT keep sidebar expanded on mobile
- Do NOT forget current page indicator
- Do NOT create overly deep navigation
- Do NOT ignore sidebar overflow scroll

## Must Follow

- Sidebar: fixed top-0 left-0 w-64 h-screen
- Main content: ml-64 (matches sidebar width)
- Mobile: sidebar hidden, hamburger menu trigger
- Active state: highlight current page
- Overflow: sidebar nav scrollable if needed

## Structure

Sidebar (top to bottom):
1. Logo/Brand area
2. Search (optional)
3. Main navigation (scrollable)
4. Secondary nav or settings
5. User profile/account

Main content:
- Left margin matches sidebar width
- Own scrolling context
- Header area for page title
- Content area below

## Responsive

Desktop (1024px+):
- Full sidebar visible
- Main content with left margin

Tablet/Mobile (< 1024px):
- Sidebar as off-canvas drawer
- Hamburger menu button
- Overlay when sidebar open
- Main content full width

## Navigation

- Group related items
- Use icons + labels
- Highlight active item
- Support nested items (accordion)
- Tooltips when collapsed

## Self-Check

After generating code, verify:
1. Sidebar is fixed position
2. Main content has correct margin
3. Mobile has hamburger menu
4. Current page is highlighted
5. Sidebar scrolls if content overflows

## Animation & Interaction Rules

- Frictionless Utility: 高交互区统一使用 duration-150，避免花哨动效打断效率。
- Magnetic Icon Shift: hover 时 icon 轻微右移（translate-x-0.5），引导视线进入主内容区。
- Solid Active State: 当前项使用完整边框与整块背景保持稳定状态，避免漂浮感。
- Content Lift: 主区卡片 hover 仅允许 -translate-y-0.5 和轻量阴影，保证阅读稳定。

/* Fixed Sidebar Global Styles */

/* Sidebar base */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 16rem; /* 256px */
  height: 100vh;
  background: white;
  border: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  z-index: 40;
  transition: transform 0.3s ease;
}

/* Main content offset */
.main-content {
  margin-left: 16rem;
  min-height: 100vh;
}

/* Mobile sidebar hidden by default */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 30;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.sidebar-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* Collapsed sidebar variant */
.sidebar-collapsed {
  width: 4rem; /* 64px */
}

.sidebar-collapsed .sidebar-label {
  display: none;
}

.sidebar-collapsed + .main-content {
  margin-left: 4rem;
}

/* Navigation item active state */
.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  color: #64748b;
  transition: all 0.2s;
}

.nav-item:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.nav-item.active {
  background: #eff6ff;
  color: #2563eb;
  font-weight: 500;
}
/* Fixed Sidebar Design Tokens */
:root {
  --sidebar-fixed-primary: #1e293b;
  --sidebar-fixed-secondary: #f8fafc;
  --sidebar-fixed-accent: #3b82f6;
  --sidebar-fixed-glow: rgba(30, 41, 59, 0.3);
}

@keyframes sidebar-fixed-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sidebar-fixed-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.sidebar-fixed-card {
  position: relative;
  overflow: hidden;
}

.sidebar-fixed-card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.05), transparent);
  pointer-events: none;
}

.sidebar-fixed-card:hover::before {
  opacity: 1;
}

.sidebar-fixed-gradient {
  background: linear-gradient(135deg, #1e293b, #3b82f6);
}

.sidebar-fixed-gradient-text {
  background: linear-gradient(135deg, #1e293b, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-fixed-frosted {
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  background: rgba(30, 41, 59, 0.08);
}

.sidebar-fixed-accent-corner {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), calc(100% - 2rem) 100%, 0 100%);
}

.sidebar-fixed-animate-in {
  animation: sidebar-fixed-fade-in 0.5s ease-out both;
}

{
  "border": {
    "width": "border",
    "color": "border-zinc-200",
    "radius": "rounded-lg",
    "style": "border-solid"
  },
  "shadow": {
    "sm": "shadow-sm",
    "md": "shadow-sm",
    "lg": "shadow-md",
    "none": "shadow-none",
    "hover": "hover:shadow-md",
    "focus": "focus:shadow-sm",
    "colored": {}
  },
  "interaction": {
    "transition": "transition-colors duration-200",
    "active": "active:scale-95",
    "hoverOpacity": "hover:opacity-90"
  },
  "typography": {
    "heading": "font-semibold tracking-tight",
    "body": "font-sans",
    "mono": "font-mono",
    "sizes": {
      "hero": "text-2xl md:text-3xl",
      "h1": "text-xl md:text-2xl",
      "h2": "text-lg md:text-xl",
      "h3": "text-base md:text-lg",
      "body": "text-sm",
      "small": "text-xs"
    }
  },
  "spacing": {
    "section": "py-6 md:py-8",
    "container": "px-4 md:px-6 lg:px-8",
    "card": "p-4 md:p-6",
    "gap": {
      "sm": "gap-2 md:gap-3",
      "md": "gap-4 md:gap-6",
      "lg": "gap-6 md:gap-8"
    }
  },
  "colors": {
    "background": {
      "primary": "bg-zinc-50",
      "secondary": "bg-white",
      "accent": [
        "bg-blue-500",
        "bg-emerald-500",
        "bg-amber-500",
        "bg-red-500"
      ]
    },
    "text": {
      "primary": "text-zinc-900",
      "secondary": "text-zinc-600",
      "muted": "text-zinc-400"
    },
    "button": {
      "primary": "bg-blue-500 text-white",
      "secondary": "bg-zinc-100 text-zinc-700",
      "danger": "bg-red-500 text-white"
    }
  },
  "forbidden": {
    "classes": [
      "rounded-2xl",
      "rounded-3xl",
      "rounded-full",
      "shadow-2xl",
      "font-black",
      "font-extrabold",
      "text-4xl",
      "text-5xl",
      "text-6xl"
    ],
    "patterns": [
      "^rounded-(?:2xl|3xl|full)",
      "^shadow-2xl",
      "^text-[456]xl"
    ],
    "reasons": {
      "rounded-2xl": "Sidebar Fixed uses compact rounded-lg for functional UI elements",
      "shadow-2xl": "Sidebar Fixed uses subtle shadows for a clean dashboard feel",
      "text-5xl": "Sidebar Fixed uses compact typography appropriate for data-dense layouts"
    }
  },
  "required": {
    "button": [
      "rounded-lg",
      "text-sm font-medium",
      "transition-colors"
    ],
    "card": [
      "bg-white",
      "rounded-xl",
      "border border-zinc-200",
      "shadow-sm"
    ],
    "input": [
      "bg-zinc-100",
      "border-0",
      "rounded-lg",
      "text-sm",
      "focus:outline-none focus:ring-2 focus:ring-blue-500/30"
    ]
  }
}