/*!
 * KNIME+AI 页面样式系统
 * 现代化企业级页面样式
 * 版本: 1.0.0
 * 更新时间: 2025-10-30
 */

/* ================================
   变量定义
   ================================ */
:root {
  /* 品牌色彩 */
  --brand-primary: #51d1a6;
  --brand-secondary: #5aa0ff;
  --brand-accent: #ffb14f;
  --brand-success: #51d1a6;
  --brand-warning: #ffb14f;
  --brand-danger: #ff6b6b;
  --brand-info: #5aa0ff;

  /* 深色主题 */
  --bg-primary: #0b0f14;
  --bg-secondary: #121821;
  --bg-tertiary: #1a2332;
  --bg-card: #192030;
  --bg-elevated: #1e2936;

  /* 文本颜色 */
  --text-primary: #e7edf5;
  --text-secondary: #9fb1c6;
  --text-muted: #64748b;
  --text-inverse: #001b12;

  /* 边框和阴影 */
  --border-primary: #203042;
  --border-secondary: #2d3748;
  --border-light: #334155;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* 渐变色 */
  --gradient-primary: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-primary) 100%);
  --gradient-accent: linear-gradient(135deg, var(--brand-accent) 0%, var(--brand-warning) 100%);
  --gradient-dark: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);

  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', Consolas, 'Courier New', monospace;

  /* 过渡动画 */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================
   基础样式重置
   ================================ */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ================================
   页面布局
   ================================ */
.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-header {
  background: rgba(11, 15, 20, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-base);
}

.page-content {
  flex: 1;
  padding: var(--spacing-3xl) 0;
}

.page-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding: var(--spacing-2xl) 0;
  margin-top: auto;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ================================
   Hero 区域
   ================================ */
.hero-section {
  padding: var(--spacing-3xl) 0;
  background: var(--gradient-dark);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(81, 209, 166, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  font-weight: 400;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(81, 209, 166, 0.1);
  border: 1px solid var(--brand-primary);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--brand-primary);
  transition: all var(--transition-base);
}

.badge:hover {
  background: rgba(81, 209, 166, 0.2);
  transform: translateY(-2px);
}

/* ================================
   导航栏样式
   ================================ */
.navbar {
  padding: var(--spacing-md) 0;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff !important;
  text-decoration: none;
  transition: all var(--transition-base);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
  flex-shrink: 0;
}

.navbar-brand:hover {
  color: var(--brand-primary) !important;
  transform: translateY(-1px);
}

.navbar-brand i {
  font-size: 1.5rem;
  color: var(--brand-primary) !important;
  flex-shrink: 0;
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: rgba(255, 255, 255, 0.85) !important;
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
  font-weight: 500;
  font-size: 1rem;
  white-space: nowrap;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.nav-link:hover {
  color: #ffffff !important;
  background: rgba(81, 209, 166, 0.15);
  transform: translateY(-1px);
}

.nav-link.active {
  color: #ffffff !important;
  background: rgba(81, 209, 166, 0.2);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

/* 响应式导航栏优化 */
@media (max-width: 768px) {
  .navbar-brand {
    font-size: 1.1rem;
    gap: var(--spacing-xs);
  }

  .navbar-nav {
    gap: var(--spacing-md);
  }

  .nav-link {
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: var(--spacing-sm) 0;
  }

  .navbar-brand {
    font-size: 1rem;
    gap: var(--spacing-xs);
  }

  .navbar-brand span {
    display: none;
  }

  .navbar-brand i {
    font-size: 1.3rem;
  }

  .navbar-nav {
    gap: var(--spacing-sm);
  }

  .nav-link {
    font-size: 0.85rem;
    padding: var(--spacing-xs);
  }
}

/* 移动端菜单样式优化 */
.navbar-toggler {
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Bootstrap 5 导航栏重置 */
.navbar-dark .navbar-toggler {
  border-color: rgba(255, 255, 255, 0.2);
}

.navbar-dark .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 导航栏滚动效果增强 */
.navbar.scrolled {
  background: rgba(11, 15, 20, 0.98) !important;
  backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* 确保所有页面导航栏的一致性 */
.page-header {
  background: rgba(11, 15, 20, 0.95) !important;
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-base);
}

/* 特殊页面导航栏适配 */
body {
  padding-top: 0; /* 防止导航栏遮挡内容 */
}

/* 确保品牌名称在所有情况下都可见 */
.navbar-brand span,
.navbar-brand strong {
  color: #ffffff !important;
  font-weight: 700;
  display: inline-block;
}

/* 活跃页面链接增强 */
.nav-link.active {
  position: relative;
  font-weight: 600;
}

.nav-link.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: -2px;
  background: var(--gradient-primary);
  opacity: 0.8;
  border-radius: 0 0 2px 2px;
}

/* ================================
   卡片组件
   ================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--brand-primary);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  font-size: 1.5rem;
  color: var(--text-inverse);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.card-description {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.card-features {
  list-style: none;
  padding: 0;
  margin: 0;
}

.card-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
  color: var(--text-secondary);
}

.card-features i {
  color: var(--brand-primary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
  flex-shrink: 0;
}

/* ================================
   特色区域
   ================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-2xl);
  margin: var(--spacing-3xl) 0;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--brand-primary);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
  font-size: 2rem;
  color: var(--text-inverse);
  position: relative;
}

.feature-icon::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-2xl);
  opacity: 0.2;
  z-index: -1;
  filter: blur(8px);
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1.125rem;
}

/* ================================
   统计数据
   ================================ */
.stats-section {
  background: var(--gradient-dark);
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-lg);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--brand-primary);
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 1.125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ================================
   内容区块
   ================================ */
.content-section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-3xl);
}

/* ================================
   按钮样式
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: transparent;
  color: var(--brand-primary);
  border: 1px solid var(--brand-primary);
}

.btn-secondary:hover {
  background: rgba(81, 209, 166, 0.1);
  transform: translateY(-2px);
}

.btn-group {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-2xl);
}

/* ================================
   列表样式
   ================================ */
.feature-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-lg) 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-primary);
}

.feature-list li:last-child {
  border-bottom: none;
}

.feature-list i {
  color: var(--brand-primary);
  font-size: 1.125rem;
  margin-top: 0.125rem;
  flex-shrink: 0;
}

/* ================================
   图片展示
   ================================ */
.image-showcase {
  margin: var(--spacing-2xl) 0;
  text-align: center;
}

.showcase-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-primary);
  transition: all var(--transition-base);
}

.showcase-image:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-xl);
}

.image-caption {
  margin-top: var(--spacing-lg);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-style: italic;
}

/* ================================
   响应式设计
   ================================ */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-section,
  .content-section,
  .stats-section {
    padding: var(--spacing-2xl) 0;
  }

  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .feature-grid,
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .stats-container {
    grid-template-columns: repeat(2, 1fr);
  }

  .btn-group {
    flex-direction: column;
  }

  .navbar-nav {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .page-content {
    padding: var(--spacing-2xl) 0;
  }
}

@media (max-width: 480px) {
  .hero-badges {
    flex-direction: column;
    align-items: center;
  }

  .stats-container {
    grid-template-columns: 1fr;
  }

  .card,
  .feature-card {
    padding: var(--spacing-lg);
  }
}

/* ================================
   动画效果
   ================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ================================
   滚动条样式
   ================================ */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-primary);
}

/* ================================
   选择文本样式
   ================================ */
::selection {
  background: rgba(81, 209, 166, 0.2);
  color: var(--text-primary);
}

::-moz-selection {
  background: rgba(81, 209, 166, 0.2);
  color: var(--text-primary);
}