/**
 * Premium UI Design System - Teams & Apple Inspired
 * 高级界面设计系统 - 融合Microsoft Teams Fluent 2 和 Apple 设计语言
 */

/* ============================================
   1. 设计令牌 (Design Tokens)
   ============================================ */

:root {
  /* 主色调 - Rheem品牌色 */
  --color-primary: #C41230;
  --color-primary-light: #E84545;
  --color-primary-dark: #9A0F26;
  --color-primary-subtle: rgba(196, 18, 48, 0.08);
  
  /* 中性色 - Apple风格高级灰 */
  --color-background: #F5F5F7;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FAFAFA;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-strong: rgba(0, 0, 0, 0.16);
  
  /* 文字色 - 高对比度 */
  --color-text-primary: #1D1D1F;
  --color-text-secondary: #86868B;
  --color-text-tertiary: #A1A1A6;
  --color-text-inverse: #FFFFFF;
  
  /* 功能色 - Teams风格 */
  --color-success: #00B050;
  --color-warning: #FF8C00;
  --color-error: #E74848;
  --color-info: #0078D4;
  
  /* 玻璃拟态效果 (Glassmorphism) */
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-bg-dark: rgba(29, 29, 31, 0.72);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  --backdrop-blur: saturate(180%) blur(20px);
  
  /* 阴影层级 - Fluent 2 风格 */
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.08), 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-2: 0 4px 8px rgba(0, 0, 0, 0.08), 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-3: 0 8px 16px rgba(0, 0, 0, 0.08), 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-4: 0 16px 32px rgba(0, 0, 0, 0.12), 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-float: 0 24px 48px rgba(0, 0, 0, 0.16), 0 0 1px rgba(0, 0, 0, 0.08);
  
  /* 圆角 - Apple风格 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* 间距 - 8px基准 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  
  /* 字体 - 系统字体栈 */
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI Variable', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'SFMono-Regular', Consolas, monospace;
  
  /* 字体大小 */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  --text-4xl: 40px;
  
  /* 行高 */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  /* 字重 */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* 动画 - Apple风格流畅动效 */
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 350ms;
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================
   2. 基础重置与全局样式
   ============================================ */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--text-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* ============================================
   3. 高级组件样式
   ============================================ */

/* --- 3.1 玻璃拟态卡片 (Glass Card) --- */
.card-premium {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--backdrop-blur);
  backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  padding: var(--space-6);
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card-premium::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
}

.card-premium:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-3);
}

.card-premium:active {
  transform: translateY(0);
  box-shadow: var(--shadow-2);
}

/* --- 3.2 高级按钮系统 --- */
.btn-premium {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.btn-premium::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.12), transparent);
  pointer-events: none;
}

.btn-premium-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-text-inverse);
  box-shadow: 0 1px 2px rgba(196, 18, 48, 0.3), 0 0 0 1px rgba(196, 18, 48, 0.2);
}

.btn-premium-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  box-shadow: 0 4px 12px rgba(196, 18, 48, 0.4);
  transform: translateY(-1px);
}

.btn-premium-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-1);
}

.btn-premium-secondary:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-border);
  box-shadow: var(--shadow-2);
}

.btn-premium-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-premium-ghost:hover {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

/* --- 3.3 浮动导航栏 (Teams风格) --- */
.nav-premium {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--backdrop-blur);
  backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-4) var(--space-6);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-1);
}

.nav-premium-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav-premium-logo {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav-premium-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-premium-link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-premium-link:hover {
  color: var(--color-text-primary);
  background: rgba(0, 0, 0, 0.04);
}

.nav-premium-link.active {
  color: var(--color-primary);
  background: var(--color-primary-subtle);
}

/* --- 3.4 工作台分组卡片 --- */
.workstation-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.workstation-header {
  margin-bottom: var(--space-6);
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.workstation-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.workstation-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.workstation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

/* --- 3.5 高级功能卡片 --- */
.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.1));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: xor;
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
  border-color: var(--color-border-strong);
}

.feature-card-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  width: fit-content;
}

.feature-card-badge.new {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
  color: white;
}

.feature-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--color-primary-subtle);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.feature-card-content {
  flex: 1;
}

.feature-card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.feature-card-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

.feature-card-action {
  margin-top: auto;
  padding-top: var(--space-4);
}

/* --- 3.6 浮动标签页 --- */
.tab-premium {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-1);
  background: rgba(0, 0, 0, 0.04);
  border-radius: var(--radius-md);
  width: fit-content;
}

.tab-premium-item {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  border: none;
  background: transparent;
}

.tab-premium-item:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.5);
}

.tab-premium-item.active {
  color: var(--color-text-primary);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}

/* --- 3.7 统计卡片 --- */
.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: all var(--duration-base) var(--ease-out);
}

.stat-card:hover {
  box-shadow: var(--shadow-2);
  border-color: var(--color-border-strong);
}

.stat-card-value {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.stat-card-value.success { color: var(--color-success); }
.stat-card-value.warning { color: var(--color-warning); }
.stat-card-value.info { color: var(--color-info); }

.stat-card-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* --- 3.8 输入框样式 --- */
.input-premium {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  outline: none;
}

.input-premium:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.input-premium::placeholder {
  color: var(--color-text-tertiary);
}

/* --- 3.9 侧边栏导航 --- */
.sidebar-premium {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  width: 260px;
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  overflow-y: auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0 var(--space-3);
  margin-bottom: var(--space-2);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
}

.sidebar-item:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--color-text-primary);
}

.sidebar-item.active {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

/* --- 3.10 模态框/对话框 --- */
.modal-premium {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--backdrop-blur);
  backdrop-filter: var(--backdrop-blur);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-float);
  padding: var(--space-8);
  border: 1px solid var(--glass-border);
  max-width: 520px;
  width: 100%;
  position: relative;
}

.modal-premium-header {
  margin-bottom: var(--space-6);
}

.modal-premium-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
}

.modal-premium-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}

.modal-premium-close:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--color-text-primary);
}

/* ============================================
   4. 布局工具类
   ============================================ */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

/* ============================================
   5. 动画效果
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-16px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-fade-in {
  animation: fadeIn var(--duration-base) var(--ease-out);
}

.animate-slide-in {
  animation: slideIn var(--duration-base) var(--ease-out);
}

/* ============================================
   6. 响应式设计
   ============================================ */

@media (max-width: 768px) {
  :root {
    --radius-lg: 16px;
    --space-6: 20px;
    --space-8: 24px;
  }
  
  .workstation-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-premium-content {
    flex-wrap: wrap;
  }
  
  .nav-premium-links {
    display: none;
  }
  
  .sidebar-premium {
    width: 100%;
    transform: translateX(-100%);
    transition: transform var(--duration-base) var(--ease-out);
  }
  
  .sidebar-premium.open {
    transform: translateX(0);
  }
}

/* ============================================
   7. 深色模式支持 (Dark Mode)
   ============================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0A0A0A;
    --color-surface: #1C1C1E;
    --color-surface-elevated: #2C2C2E;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-strong: rgba(255, 255, 255, 0.16);
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #A1A1A6;
    --color-text-tertiary: #6E6E73;
    --glass-bg: rgba(28, 28, 30, 0.72);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.2), 0 0 1px rgba(0, 0, 0, 0.1);
    --shadow-2: 0 4px 8px rgba(0, 0, 0, 0.3), 0 0 1px rgba(0, 0, 0, 0.2);
    --shadow-3: 0 8px 16px rgba(0, 0, 0, 0.4), 0 0 1px rgba(0, 0, 0, 0.2);
  }
}