/* ==========================================
   Personal Brand Portfolio - Design System
   ========================================== */

/* CSS Variables for Design System */
:root {
  /* ===== Color System ===== */
  /* Primary Colors */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;

  /* Secondary Colors */
  --color-secondary-50: #f0f9ff;
  --color-secondary-100: #e0f2fe;
  --color-secondary-200: #bae6fd;
  --color-secondary-300: #7dd3fc;
  --color-secondary-400: #38bdf8;
  --color-secondary-500: #0ea5e9;
  --color-secondary-600: #0284c7;
  --color-secondary-700: #0369a1;
  --color-secondary-800: #075985;
  --color-secondary-900: #0c4a6e;

  /* Neutral Colors */
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;

  /* Accent Colors */
  --color-accent-emerald: #10b981;
  --color-accent-amber: #f59e0b;
  --color-accent-rose: #f43f5e;
  --color-accent-purple: #8b5cf6;

  /* ===== Performance Optimized Animations ===== */
  --animation-duration-fast: 150ms;
  --animation-duration-normal: 300ms;
  --animation-duration-slow: 500ms;
  --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
  --animation-easing-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ===== Typography System ===== */
  /* Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  --text-7xl: 4.5rem;      /* 72px */

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Font Weights */
  --font-thin: 100;
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  --font-black: 900;

  /* ===== Spacing System ===== */
  --space-0: 0;
  --space-1: 0.25rem;      /* 4px */
  --space-2: 0.5rem;       /* 8px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-8: 2rem;         /* 32px */
  --space-10: 2.5rem;      /* 40px */
  --space-12: 3rem;        /* 48px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-32: 8rem;        /* 128px */
  --space-40: 10rem;       /* 160px */
  --space-48: 12rem;       /* 192px */
  --space-56: 14rem;       /* 224px */
  --space-64: 16rem;       /* 256px */

  /* ===== Border & Border Radius ===== */
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;
  --border-width-8: 8px;

  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-base: 0.25rem;  /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* ===== Shadow System ===== */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  --shadow-none: 0 0 #0000;

  /* ===== Responsive Breakpoints ===== */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* ===== Z-Index System ===== */
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-auto: auto;

  /* ===== Transition System ===== */
  --transition-none: none;
  --transition-all: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-default: color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                        background-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                        border-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                        text-decoration-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                        fill 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-colors: color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       background-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       border-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       text-decoration-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       fill 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-opacity: opacity 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-shadow: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-transform: transform 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   Global Styles & Reset
   ========================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&family=Poppins:wght@100;200;300;400;500;600;700;800;900&family=JetBrains+Mono:wght@100;200;300;400;500;600;700;800&display=swap');

/* Global Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-primary);
  line-height: var(--leading-normal);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-normal);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-neutral-800);
  background-color: var(--color-neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-neutral-900);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

/* Links */
a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: var(--transition-colors);
}

a:hover {
  color: var(--color-primary-700);
}

a:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Buttons */
button {
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition-all);
}

/* Form Elements */
input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Code */
code, pre {
  font-family: var(--font-mono);
}

/* ==========================================
   Utility Classes
   ========================================== */

/* Custom Color Classes */
.text-primary { color: var(--color-primary-600); }
.text-secondary { color: var(--color-secondary-600); }
.text-accent-emerald { color: var(--color-accent-emerald); }
.text-accent-amber { color: var(--color-accent-amber); }
.text-accent-rose { color: var(--color-accent-rose); }
.text-accent-purple { color: var(--color-accent-purple); }

.bg-primary { background-color: var(--color-primary-600); }
.bg-secondary { background-color: var(--color-secondary-600); }
.bg-accent-emerald { background-color: var(--color-accent-emerald); }
.bg-accent-amber { background-color: var(--color-accent-amber); }
.bg-accent-rose { background-color: var(--color-accent-rose); }
.bg-accent-purple { background-color: var(--color-accent-purple); }

/* Custom Font Classes */
.font-primary { font-family: var(--font-primary); }
.font-heading { font-family: var(--font-heading); }
.font-mono { font-family: var(--font-mono); }

/* Custom Shadow Classes */
.shadow-custom-sm { box-shadow: var(--shadow-sm); }
.shadow-custom-base { box-shadow: var(--shadow-base); }
.shadow-custom-md { box-shadow: var(--shadow-md); }
.shadow-custom-lg { box-shadow: var(--shadow-lg); }
.shadow-custom-xl { box-shadow: var(--shadow-xl); }
.shadow-custom-2xl { box-shadow: var(--shadow-2xl); }

/* Custom Transition Classes */
.transition-custom { transition: var(--transition-default); }
.transition-colors-custom { transition: var(--transition-colors); }
.transition-opacity-custom { transition: var(--transition-opacity); }
.transition-shadow-custom { transition: var(--transition-shadow); }
.transition-transform-custom { transition: var(--transition-transform); }

/* ==========================================
   Responsive Design Helpers
   ========================================== */

/* Container with custom breakpoints */
.container-custom {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container-custom {
    max-width: 640px;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 768px) {
  .container-custom {
    max-width: 768px;
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .container-custom {
    max-width: 1024px;
  }
}

@media (min-width: 1280px) {
  .container-custom {
    max-width: 1280px;
  }
}

@media (min-width: 1536px) {
  .container-custom {
    max-width: 1536px;
  }
}

/* ==========================================
   Component Base Styles
   ========================================== */

/* Card Component */
.card {
  background-color: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  border: var(--border-width-1) solid var(--color-neutral-200);
  transition: var(--transition-shadow);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  line-height: var(--leading-none);
  border-radius: var(--radius-md);
  border: var(--border-width-1) solid transparent;
  cursor: pointer;
  transition: var(--transition-all);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary-600);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  color: white;
}

.btn-secondary {
  background-color: var(--color-secondary-600);
  color: white;
}

.btn-secondary:hover {
  background-color: var(--color-secondary-700);
  color: white;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.btn-outline:hover {
  background-color: var(--color-primary-600);
  color: white;
}

/* Navigation Components */
.nav-link {
  position: relative;
  font-weight: var(--font-medium);
  transition: var(--transition-colors);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-600);
  transition: var(--transition-all);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Form Components */
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: var(--border-width-1) solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  background-color: white;
  font-size: var(--text-base);
  transition: var(--transition-all);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
}

/* ==========================================
   Dark Mode Support
   ========================================== */

@media (prefers-color-scheme: dark) {
  :root {
    --color-neutral-50: #0f172a;
    --color-neutral-100: #1e293b;
    --color-neutral-200: #334155;
    --color-neutral-300: #475569;
    --color-neutral-400: #64748b;
    --color-neutral-500: #94a3b8;
    --color-neutral-600: #cbd5e1;
    --color-neutral-700: #e2e8f0;
    --color-neutral-800: #f1f5f9;
    --color-neutral-900: #f8fafc;
  }

  body {
    background-color: var(--color-neutral-50);
    color: var(--color-neutral-800);
  }

  .card {
    background-color: var(--color-neutral-100);
    border-color: var(--color-neutral-200);
  }
}

/* ==========================================
   通用组件样式类 - Tailwind 增强版
   ========================================== */

/* ===== 按钮样式系统 ===== */

/* 基础按钮类 */
.btn-base {
  @apply inline-flex items-center justify-center;
  @apply font-medium rounded-lg;
  @apply transition-all duration-200 ease-in-out;
  @apply focus:outline-none focus:ring-2 focus:ring-offset-2;
  @apply disabled:opacity-50 disabled:cursor-not-allowed;
  @apply select-none whitespace-nowrap;
}

/* 按钮尺寸 */
.btn-xs {
  @apply px-2 py-1 text-xs;
  @apply min-h-[24px] gap-1;
}

.btn-sm {
  @apply px-3 py-1.5 text-sm;
  @apply min-h-[32px] gap-1.5;
}

.btn-md {
  @apply px-4 py-2 text-sm;
  @apply min-h-[40px] gap-2;
}

.btn-lg {
  @apply px-6 py-3 text-base;
  @apply min-h-[48px] gap-2;
}

.btn-xl {
  @apply px-8 py-4 text-lg;
  @apply min-h-[56px] gap-3;
}

/* 主要按钮样式 */
.btn-primary {
  @apply btn-base;
  @apply bg-primary-600 text-white border border-primary-600;
  @apply hover:bg-primary-700 hover:border-primary-700;
  @apply active:bg-primary-800 active:border-primary-800;
  @apply focus:ring-primary-500;
  @apply shadow-sm hover:shadow-md;
}

.btn-primary:disabled {
  @apply bg-primary-300 border-primary-300;
  @apply hover:bg-primary-300 hover:border-primary-300;
  @apply shadow-none;
}

/* 次要按钮样式 */
.btn-secondary {
  @apply btn-base;
  @apply bg-secondary-600 text-white border border-secondary-600;
  @apply hover:bg-secondary-700 hover:border-secondary-700;
  @apply active:bg-secondary-800 active:border-secondary-800;
  @apply focus:ring-secondary-500;
  @apply shadow-sm hover:shadow-md;
}

.btn-secondary:disabled {
  @apply bg-secondary-300 border-secondary-300;
  @apply hover:bg-secondary-300 hover:border-secondary-300;
  @apply shadow-none;
}

/* 轮廓按钮样式 */
.btn-outline {
  @apply btn-base;
  @apply bg-transparent text-primary-600 border border-primary-600;
  @apply hover:bg-primary-50 hover:text-primary-700;
  @apply active:bg-primary-100;
  @apply focus:ring-primary-500;
}

.btn-outline:disabled {
  @apply text-neutral-400 border-neutral-300;
  @apply hover:bg-transparent hover:text-neutral-400;
}

/* 文本按钮样式 */
.btn-text {
  @apply btn-base;
  @apply bg-transparent text-primary-600 border border-transparent;
  @apply hover:bg-primary-50 hover:text-primary-700;
  @apply active:bg-primary-100;
  @apply focus:ring-primary-500;
  @apply shadow-none;
}

.btn-text:disabled {
  @apply text-neutral-400;
  @apply hover:bg-transparent hover:text-neutral-400;
}

/* 幽灵按钮样式 */
.btn-ghost {
  @apply btn-base;
  @apply bg-transparent text-neutral-700 border border-transparent;
  @apply hover:bg-neutral-100 hover:text-neutral-900;
  @apply active:bg-neutral-200;
  @apply focus:ring-neutral-500;
  @apply shadow-none;
}

.btn-ghost:disabled {
  @apply text-neutral-400;
  @apply hover:bg-transparent hover:text-neutral-400;
}

/* 危险按钮样式 */
.btn-danger {
  @apply btn-base;
  @apply bg-red-600 text-white border border-red-600;
  @apply hover:bg-red-700 hover:border-red-700;
  @apply active:bg-red-800 active:border-red-800;
  @apply focus:ring-red-500;
  @apply shadow-sm hover:shadow-md;
}

.btn-danger:disabled {
  @apply bg-red-300 border-red-300;
  @apply hover:bg-red-300 hover:border-red-300;
  @apply shadow-none;
}

/* ===== 卡片样式系统 ===== */

/* 基础卡片类 */
.card-base {
  @apply bg-white rounded-lg border border-neutral-200;
  @apply transition-all duration-300 ease-in-out;
  @apply overflow-hidden;
}

/* 卡片变体 */
.card-default {
  @apply card-base shadow-sm;
  @apply hover:shadow-md hover:border-neutral-300;
  @apply hover:-translate-y-1;
}

.card-elevated {
  @apply card-base shadow-md;
  @apply hover:shadow-lg hover:border-neutral-300;
  @apply hover:-translate-y-2;
}

.card-flat {
  @apply card-base shadow-none;
  @apply hover:shadow-sm hover:border-neutral-300;
}

/* 卡片内容区域 */
.card-content {
  @apply p-6;
}

.card-content-sm {
  @apply p-4;
}

.card-content-lg {
  @apply p-8;
}

/* 卡片头部 */
.card-header {
  @apply px-6 py-4 border-b border-neutral-200;
  @apply bg-neutral-50;
}

/* 卡片底部 */
.card-footer {
  @apply px-6 py-4 border-t border-neutral-200;
  @apply bg-neutral-50;
}

/* 卡片图片容器 */
.card-image {
  @apply relative overflow-hidden;
  @apply aspect-video bg-neutral-100;
}

.card-image img {
  @apply w-full h-full object-cover;
  @apply transition-transform duration-300 ease-in-out;
}

.card-image:hover img {
  @apply scale-105;
}

/* 卡片标题 */
.card-title {
  @apply text-xl font-semibold text-neutral-900 mb-2;
  @apply line-clamp-2;
}

.card-title-sm {
  @apply text-lg font-semibold text-neutral-900 mb-2;
  @apply line-clamp-2;
}

.card-title-lg {
  @apply text-2xl font-semibold text-neutral-900 mb-3;
  @apply line-clamp-2;
}

/* 卡片描述 */
.card-description {
  @apply text-neutral-600 text-sm leading-relaxed;
  @apply line-clamp-3;
}

.card-description-lg {
  @apply text-neutral-600 text-base leading-relaxed;
  @apply line-clamp-4;
}

/* 卡片操作区域 */
.card-actions {
  @apply flex items-center justify-between mt-4;
  @apply gap-3;
}

.card-actions-center {
  @apply flex items-center justify-center mt-4;
  @apply gap-3;
}

.card-actions-end {
  @apply flex items-center justify-end mt-4;
  @apply gap-3;
}

/* 可点击卡片 */
.card-clickable {
  @apply cursor-pointer;
  @apply hover:bg-neutral-50;
  @apply active:bg-neutral-100;
}

/* ===== 标签样式系统 ===== */

/* 基础标签类 */
.tag-base {
  @apply inline-flex items-center gap-1.5;
  @apply px-2.5 py-1 text-xs font-medium;
  @apply rounded-md border;
  @apply transition-all duration-200 ease-in-out;
  @apply select-none;
}

/* 标签尺寸 */
.tag-xs {
  @apply px-1.5 py-0.5 text-xs gap-1;
}

.tag-sm {
  @apply px-2 py-1 text-xs gap-1;
}

.tag-md {
  @apply px-2.5 py-1 text-sm gap-1.5;
}

.tag-lg {
  @apply px-3 py-1.5 text-sm gap-2;
}

/* 默认标签样式 */
.tag-default {
  @apply tag-base;
  @apply bg-neutral-100 text-neutral-700 border-neutral-200;
  @apply hover:bg-neutral-200;
}

/* 主要标签样式 */
.tag-primary {
  @apply tag-base;
  @apply bg-primary-100 text-primary-700 border-primary-200;
  @apply hover:bg-primary-200;
}

/* 次要标签样式 */
.tag-secondary {
  @apply tag-base;
  @apply bg-secondary-100 text-secondary-700 border-secondary-200;
  @apply hover:bg-secondary-200;
}

/* 成功标签样式 */
.tag-success {
  @apply tag-base;
  @apply bg-emerald-100 text-emerald-700 border-emerald-200;
  @apply hover:bg-emerald-200;
}

/* 警告标签样式 */
.tag-warning {
  @apply tag-base;
  @apply bg-amber-100 text-amber-700 border-amber-200;
  @apply hover:bg-amber-200;
}

/* 错误标签样式 */
.tag-error {
  @apply tag-base;
  @apply bg-red-100 text-red-700 border-red-200;
  @apply hover:bg-red-200;
}

/* 信息标签样式 */
.tag-info {
  @apply tag-base;
  @apply bg-blue-100 text-blue-700 border-blue-200;
  @apply hover:bg-blue-200;
}

/* 紫色标签样式 */
.tag-purple {
  @apply tag-base;
  @apply bg-purple-100 text-purple-700 border-purple-200;
  @apply hover:bg-purple-200;
}

/* 可关闭标签 */
.tag-closable {
  @apply pr-1;
}

.tag-close-btn {
  @apply ml-1 p-0.5 rounded-sm;
  @apply text-current opacity-60;
  @apply hover:opacity-100 hover:bg-black hover:bg-opacity-10;
  @apply focus:outline-none focus:opacity-100;
  @apply transition-all duration-150;
  @apply cursor-pointer;
}

.tag-close-btn:hover {
  @apply bg-opacity-20;
}

/* 实心标签样式 */
.tag-solid-primary {
  @apply tag-base;
  @apply bg-primary-600 text-white border-primary-600;
  @apply hover:bg-primary-700 hover:border-primary-700;
}

.tag-solid-secondary {
  @apply tag-base;
  @apply bg-secondary-600 text-white border-secondary-600;
  @apply hover:bg-secondary-700 hover:border-secondary-700;
}

.tag-solid-success {
  @apply tag-base;
  @apply bg-emerald-600 text-white border-emerald-600;
  @apply hover:bg-emerald-700 hover:border-emerald-700;
}

.tag-solid-warning {
  @apply tag-base;
  @apply bg-amber-600 text-white border-amber-600;
  @apply hover:bg-amber-700 hover:border-amber-700;
}

.tag-solid-error {
  @apply tag-base;
  @apply bg-red-600 text-white border-red-600;
  @apply hover:bg-red-700 hover:border-red-700;
}

/* 轮廓标签样式 */
.tag-outline-primary {
  @apply tag-base;
  @apply bg-transparent text-primary-600 border-primary-600;
  @apply hover:bg-primary-50;
}

.tag-outline-secondary {
  @apply tag-base;
  @apply bg-transparent text-secondary-600 border-secondary-600;
  @apply hover:bg-secondary-50;
}

.tag-outline-success {
  @apply tag-base;
  @apply bg-transparent text-emerald-600 border-emerald-600;
  @apply hover:bg-emerald-50;
}

.tag-outline-warning {
  @apply tag-base;
  @apply bg-transparent text-amber-600 border-amber-600;
  @apply hover:bg-amber-50;
}

.tag-outline-error {
  @apply tag-base;
  @apply bg-transparent text-red-600 border-red-600;
  @apply hover:bg-red-50;
}

/* ===== 工具类增强 ===== */

/* 行高限制工具类 */
.line-clamp-1 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
}

.line-clamp-2 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.line-clamp-3 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.line-clamp-4 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
}

/* 响应式隐藏/显示工具类 */
.hide-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
  display: none;
}

/* 交互状态增强 */
.interactive {
  @apply transition-all duration-200 ease-in-out;
  @apply hover:scale-105 active:scale-95;
}

.focus-ring {
  @apply focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2;
}

/* 动画增强 */
.animate-fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

.animate-slide-up {
  animation: slideUp 0.3s ease-out;
}

.animate-scale-in {
  animation: scaleIn 0.2s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes scaleIn {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* ==========================================
   Performance Optimizations
   ========================================== */

/* 图片懒加载优化 */
.lazy-img {
  opacity: 0;
  transition: opacity var(--animation-duration-normal) var(--animation-easing);
}

.lazy-img.loaded {
  opacity: 1;
}

/* 图片占位符效果 */
.img-placeholder {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 性能优化的加载动画 */
.loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--animation-duration-normal) var(--animation-easing);
}

.loading.fade-out {
  opacity: 0;
  pointer-events: none;
}

/* 优化的旋转动画 */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--color-primary-500);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  will-change: transform;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 动画延迟类 */
.animation-delay-200 { animation-delay: 200ms; }
.animation-delay-400 { animation-delay: 400ms; }
.animation-delay-600 { animation-delay: 600ms; }
.animation-delay-800 { animation-delay: 800ms; }
.animation-delay-1000 { animation-delay: 1000ms; }

/* 性能优化的过渡效果 */
.transition-optimized {
  transition: transform var(--animation-duration-fast) var(--animation-easing),
              opacity var(--animation-duration-fast) var(--animation-easing);
  will-change: transform, opacity;
}

.transition-spring {
  transition: transform var(--animation-duration-normal) var(--animation-easing-spring);
  will-change: transform;
}

/* 卡片悬停优化 */
.card-hover-optimized {
  transition: transform var(--animation-duration-normal) var(--animation-easing),
              box-shadow var(--animation-duration-normal) var(--animation-easing);
  will-change: transform, box-shadow;
}

.card-hover-optimized:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

/* 按钮交互优化 */
.btn-optimized {
  transition: all var(--animation-duration-fast) var(--animation-easing);
  will-change: transform, box-shadow;
  backface-visibility: hidden;
  perspective: 1000px;
}

.btn-optimized:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(59, 130, 246, 0.4);
}

.btn-optimized:active {
  transform: translateY(0);
  transition-duration: 50ms;
}

/* 导航链接悬停效果 */
.nav-link-optimized {
  position: relative;
  transition: color var(--animation-duration-fast) var(--animation-easing);
}

.nav-link-optimized::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary-500);
  transition: width var(--animation-duration-normal) var(--animation-easing);
}

.nav-link-optimized:hover::after {
  width: 100%;
}

/* Hero区域优化动画 */
.hero-gradient {
  background: linear-gradient(135deg, #1E3A8A 0%, #3B82F6 100%);
  position: relative;
}

.hero-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 58, 138, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
  animation: gradient-shift 8s ease-in-out infinite alternate;
}

@keyframes gradient-shift {
  0% { opacity: 0.5; }
  100% { opacity: 0.8; }
}

/* 代码编辑器优化 */
.code-editor {
  background: #1e1e1e;
  border-radius: 12px;
  padding: 20px;
  font-family: var(--font-mono);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: transform var(--animation-duration-normal) var(--animation-easing);
  will-change: transform;
}

.code-editor .line {
  display: block;
  margin: 4px 0;
  opacity: 0;
  animation: type-in 0.5s ease forwards;
}

.code-editor .line:nth-child(1) { animation-delay: 0.5s; }
.code-editor .line:nth-child(2) { animation-delay: 0.7s; }
.code-editor .line:nth-child(3) { animation-delay: 0.9s; }
.code-editor .line:nth-child(4) { animation-delay: 1.1s; }
.code-editor .line:nth-child(5) { animation-delay: 1.3s; }

@keyframes type-in {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 语法高亮 */
.keyword { color: #569cd6; }
.string { color: #ce9178; }
.comment { color: #6a9955; }
.function { color: #dcdcaa; }
.variable { color: #9cdcfe; }

/* 响应式优化 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 暗色模式优化 */
@media (prefers-color-scheme: dark) {
  .loading {
    background: #111827;
  }
  
  .spinner {
    border-color: #374151;
    border-top-color: var(--color-primary-400);
  }
}