/* 本地化Tailwind CSS - 完全修复版本 */
* {
  box-sizing: border-box;
}

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.5;
  color: #1f2937;
}

/* 布局类 */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.block { display: block; }
.inline-block { display: inline-block; }
.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* 方向 */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

/* 对齐 */
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

/* 尺寸 */
.w-full { width: 100%; }
.w-1\/2 { width: 50%; }
.w-1\/3 { width: 33.333333%; }
.w-2\/3 { width: 66.666667%; }
.w-64 { width: 16rem; }
.w-10 { width: 2.5rem; }
.w-8 { width: 2rem; }
.w-12 { width: 3rem; }
.w-16 { width: 4rem; }
.w-20 { width: 5rem; }
.w-32 { width: 8rem; }
.w-56 { width: 14rem; }
.h-full { height: 100%; }
.h-screen { height: 100vh; }
.min-h-screen { min-height: 100vh; }
.h-10 { height: 2.5rem; }
.h-8 { height: 2rem; }
.h-12 { height: 3rem; }
.h-16 { height: 4rem; }
.h-20 { height: 5rem; }
.h-32 { height: 8rem; }
.h-64 { height: 16rem; }

/* 间距 */
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }
.p-12 { padding: 3rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-2.5 { padding-top: 0.625rem; padding-bottom: 0.625rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.m-0 { margin: 0; }
.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 0.75rem; }
.m-4 { margin: 1rem; }
.m-6 { margin: 1.5rem; }
.m-8 { margin: 2rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-auto { margin-top: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.space-x-2 > * + * { margin-left: 0.5rem; }
.space-x-3 > * + * { margin-left: 0.75rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-4 > * + * { margin-top: 1rem; }

/* 文本 */
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.leading-relaxed { line-height: 1.625; }
.whitespace-nowrap { white-space: nowrap; }
.uppercase { text-transform: uppercase; }
.lowercase { text-transform: lowercase; }
.capitalize { text-transform: capitalize; }
.break-words { word-wrap: break-word; }

/* 颜色 */
.text-white { color: #ffffff; }
.text-gray-50 { color: #f9fafb; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1f2937; }
.text-blue-500 { color: #3b82f6; }
.text-blue-600 { color: #2563eb; }
.text-green-500 { color: #10b981; }
.text-green-600 { color: #059669; }
.text-yellow-600 { color: #d97706; }
.text-purple-600 { color: #9333ea; }
.text-red-500 { color: #ef4444; }
.text-red-600 { color: #dc2626; }
.text-orange-600 { color: #ea580c; }

/* Primary和Accent颜色 */
.text-primary-600 { color: #0ea5e9; }
.text-primary-500 { color: #3b82f6; }
.text-primary-400 { color: #38bdf8; }
.text-accent-600 { color: #16a34a; }
.text-accent-500 { color: #22c55e; }

/* 背景色 */
.bg-white { background-color: #ffffff; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-gray-100 { background-color: #f3f4f6; }
.bg-gray-200 { background-color: #e5e7eb; }
.bg-blue-50 { background-color: #eff6ff; }
.bg-blue-100 { background-color: #dbeafe; }
.bg-blue-500 { background-color: #3b82f6; }
.bg-blue-600 { background-color: #2563eb; }
.bg-green-50 { background-color: #f0fdf4; }
.bg-green-100 { background-color: #dcfce7; }
.bg-green-500 { background-color: #10b981; }
.bg-green-600 { background-color: #059669; }
.bg-yellow-100 { background-color: #fef3c7; }
.bg-yellow-500 { background-color: #eab308; }
.bg-purple-100 { background-color: #f3e8ff; }
.bg-purple-500 { background-color: #8b5cf6; }
.bg-red-100 { background-color: #fee2e2; }
.bg-red-500 { background-color: #ef4444; }
.bg-orange-100 { background-color: #ffedd5; }
.bg-orange-600 { background-color: #ea580c; }

/* Primary和Accent背景色 */
.bg-primary-400 { background-color: #38bdf8; }
.bg-primary-500 { background-color: #3b82f6; }
.bg-primary-600 { background-color: #2563eb; }
.bg-accent-400 { background-color: #4ade80; }
.bg-accent-500 { background-color: #22c55e; }
.bg-accent-600 { background-color: #16a34a; }

/* 渐变 */
.bg-gradient-to-b { background-image: linear-gradient(to bottom, var(--tw-gradient-stops)); }
.bg-gradient-to-br { background-image: linear-gradient(to bottom right, var(--tw-gradient-stops)); }
.bg-gradient-to-r { background-image: linear-gradient(to right, var(--tw-gradient-stops)); }
.from-blue-50 { --tw-gradient-from: #eff6ff; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(239, 246, 255, 0)); }
.from-blue-500 { --tw-gradient-from: #3b82f6; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(59, 130, 246, 0)); }
.from-green-500 { --tw-gradient-from: #10b981; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(16, 185, 129, 0)); }
.from-primary-400 { --tw-gradient-from: #38bdf8; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(56, 189, 248, 0)); }
.to-green-50 { --tw-gradient-to: #f0fdf4; }
.to-green-500 { --tw-gradient-to: #10b981; }
.to-blue-500 { --tw-gradient-to: #3b82f6; }
.to-accent-400 { --tw-gradient-to: #4ade80; }
.via-cyan-50 { --tw-gradient-stops: var(--tw-gradient-from), #ecfeff, var(--tw-gradient-to, rgba(236, 254, 255, 0)); }

/* 边框 */
.border { border-width: 1px; }
.border-2 { border-width: 2px; }
.border-b { border-bottom-width: 1px; }
.border-gray-100 { border-color: #f3f4f6; }
.border-gray-200 { border-color: #e5e7eb; }
.border-gray-300 { border-color: #d1d5db; }
.border-blue-500 { border-color: #3b82f6; }
.border-white { border-color: #ffffff; }
.border-transparent { border-color: transparent; }
.border-primary-400 { border-color: #38bdf8; }

/* 圆角 */
.rounded { border-radius: 0.25rem; }
.rounded-md { border-radius: 0.375rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-3xl { border-radius: 1.5rem; }
.rounded-full { border-radius: 9999px; }

/* 阴影 */
.shadow { box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06); }
.shadow-sm { box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05); }
.shadow-md { box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }
.shadow-xl { box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); }
.shadow-2xl { box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); }

/* 定位 */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }
.top-0 { top: 0; }
.left-0 { left: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.inset-y-0 { top: 0; bottom: 0; }
.z-10 { z-index: 10; }
.z-50 { z-index: 50; }

/* 溢出 */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-y-auto { overflow-y: auto; }

/* 变换 */
.transform { transform: translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y)); }
.scale-105 { --tw-scale-x: 1.05; --tw-scale-y: 1.05; }
.-translate-y-1/2 { --tw-translate-y: -50%; }

/* 过渡 */
.transition { transition-property: color, background-color, border-color, text-decoration-color, fill, stroke, opacity, box-shadow, transform, filter, backdrop-filter; }
.transition-all { transition-property: all; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-colors { transition-property: color, background-color, border-color, text-decoration-color, fill, stroke; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-transform { transition-property: transform; }
.duration-200 { transition-duration: 200ms; }
.duration-300 { transition-duration: 300ms; }

/* 悬停状态 */
.hover\:bg-gray-100:hover { background-color: #f3f4f6; }
.hover\:bg-blue-600:hover { background-color: #2563eb; }
.hover\:bg-green-600:hover { background-color: #16a34a; }
.hover\:bg-red-600:hover { background-color: #dc2626; }
.hover\:text-blue-600:hover { color: #2563eb; }
.hover\:text-gray-600:hover { color: #4b5563; }
.hover\:bg-blue-200:hover { background-color: #bfdbfe; }
.hover\:text-primary-600:hover { color: #0ea5e9; }
.hover\:shadow-lg:hover { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }
.hover\:scale-105:hover { --tw-scale-x: 1.05; --tw-scale-y: 1.05; }

/* 焦点状态 */
.focus\:border-primary-400:focus { border-color: #38bdf8; }
.focus\:ring-2:focus { box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.5); }
.focus\:ring-primary-100:focus { box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.1); }

/* 网格 */
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 最大宽度 */
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }
.max-w-xl { max-width: 36rem; }
.max-w-2xl { max-width: 42rem; }
.max-w-4xl { max-width: 56rem; }
.max-w-5xl { max-width: 64rem; }
.max-w-6xl { max-width: 72rem; }

/* 其他工具类 */
.flex-1 { flex: 1 1 0%; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-grow-0 { flex-grow: 0; }
.cursor-pointer { cursor: pointer; }
.select-none { user-select: none; }
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }
.min-w-0 { min-width: 0; }
.pointer-events-none { pointer-events: none; }

/* 响应式设计 */
@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sm\:flex-row { flex-direction: row; }
  .sm\:items-center { align-items: center; }
}

@media (min-width: 768px) {
  .md\:flex-row { flex-direction: row; }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .md\:p-8 { padding: 2rem; }
  .md\:text-2xl { font-size: 1.5rem; }
  .md\:text-3xl { font-size: 1.875rem; }
}

@media (min-width: 1024px) {
  .lg\:flex-row { flex-direction: row; }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:p-12 { padding: 3rem; }
  .lg\:text-3xl { font-size: 1.875rem; }
  .lg\:text-4xl { font-size: 2.25rem; }
  .lg\:p-6 { padding: 1.5rem; }
  .lg\:p-10 { padding: 2.5rem; }
  .lg\:w-1\/2 { width: 50%; }
}

@media (max-width: 768px) {
  .w-64 { width: 100%; }
  .main-content { margin-left: 0; }
  .content-container { padding: 16px; }
  .lesson-header { flex-direction: column; gap: 16px; }
  .lesson-info h1 { font-size: 24px; }
  .lesson-meta { flex-direction: column; gap: 8px; }
  .tab-nav { flex-wrap: wrap; }
  .tab-btn { padding: 8px 16px; font-size: 12px; }
  .courseware-grid { grid-template-columns: 1fr; }
  .toolbar { position: static; margin-bottom: 24px; flex-direction: row; justify-content: center; }
  .modal-content { width: 95%; margin: 16px; }
}