/* ============================================
   佳前程官网 - 主样式文件
   ============================================ */

/* CSS变量定义 */
:root {
  /* 主色调 */
  --primary: #1E3A5F;
  --primary-light: #2A4A7F;
  --primary-dark: #152B4A;

  /* 辅助色 */
  --accent: #C5A059;
  --accent-light: #D4B06A;
  --accent-dark: #B59048;

  /* 功能色 */
  --success: #52C41A;
  --warning: #FAAD14;
  --error: #FF4D4F;
  --info: #1890FF;

  /* 中性色 */
  --text-primary: #1A1A1A;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --text-inverse: #FFFFFF;

  /* 背景色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F7FA;
  --bg-tertiary: #E8ECF0;
  --bg-dark: #0A1628;

  /* 边框色 */
  --border-color: #E8E8E8;
  --border-light: #F0F0F0;

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 80px;
  --spacing-5xl: 100px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-xl: 0 12px 40px rgba(0,0,0,0.16);

  /* 字体 */
  --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-family-en: 'Inter', 'Helvetica Neue', Arial, sans-serif;

  /* 字号 */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;
  --font-size-5xl: 48px;
  --font-size-6xl: 60px;

  /* 行高 */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
}

/* ============================================
   基础重置
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
}

p {
  margin-bottom: var(--spacing-md);
}

p:last-child {
  margin-bottom: 0;
}

/* ============================================
   布局容器
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 calc(var(--spacing-lg) / -2);
}

.col {
  flex: 1;
  padding: 0 calc(var(--spacing-lg) / 2);
}

/* ============================================
   头部导航
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: transparent;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transform: translateZ(0);
  will-change: transform;
  transition: all 0.3s ease;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  border-bottom-color: var(--border-light);
}

/* 首页Hero区域时导航链接为白色 */
.header.hero-header .header__nav-link {
  color: rgba(255, 255, 255, 0.9);
}

.header.hero-header .header__nav-link:hover {
  color: #fff;
}

.header.hero-header .header__nav-link::after {
  background: #fff;
}

/* 首页滚动后导航链接为深色 */
.header.hero-header.scrolled .header__nav-link {
  color: var(--text-primary);
}

.header.hero-header.scrolled .header__nav-link:hover {
  color: var(--primary);
}

.header.hero-header.scrolled .header__nav-link::after {
  background: var(--primary);
}

/* 首页Hero区域时Logo文字为白色 */
.header.hero-header .header__logo-text {
  color: #fff;
}

.header.hero-header.scrolled .header__logo-text {
  color: var(--primary);
}

/* 首页Hero区域时电话文字为白色 */
.header.hero-header .header__contact {
  color: rgba(255, 255, 255, 0.8);
}

.header.hero-header.scrolled .header__contact {
  color: var(--text-secondary);
}

/* 其他页面导航栏默认深色 */
.header:not(.hero-header) {
  background: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--border-light);
}

.header:not(.hero-header) .header__nav-link {
  color: var(--text-primary);
}

.header:not(.hero-header) .header__nav-link:hover {
  color: var(--primary);
}

.header:not(.hero-header) .header__nav-link::after {
  background: var(--primary);
}

.header:not(.hero-header) .header__logo-text {
  color: var(--primary);
}

.header:not(.hero-header) .header__contact {
  color: var(--text-secondary);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header__logo img {
  height: 40px;
  width: auto;
}

.header__logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.header__nav-link {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
  transition: color var(--transition-fast);
  position: relative;
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}

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

.header__nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.header__nav-link:hover {
  color: var(--primary);
}

.header__cta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header__contact {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.header__contact svg {
  width: 16px;
  height: 16px;
}

/* 移动端菜单按钮 */
.header__menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.header__menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-normal);
}

/* ============================================
   按钮组件
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px 28px;
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
}

.btn--primary {
  background: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
}

.btn--primary:hover {
  background: var(--primary-light);
  border-color: var(--primary-light);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--secondary:hover {
  background: var(--primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
}

.btn--accent {
  background: var(--accent);
  color: var(--text-inverse);
  border-color: var(--accent);
}

.btn--accent:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--large {
  padding: 16px 36px;
  font-size: var(--font-size-lg);
}

.btn--small {
  padding: 8px 20px;
  font-size: var(--font-size-sm);
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ============================================
   Hero区域
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  overflow: hidden;
  padding-top: 80px;
}

.hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.hero__bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.hero__particles {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(197, 160, 89, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(197, 160, 89, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--text-inverse);
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-4xl) var(--spacing-lg);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  font-weight: 400;
  color: var(--accent);
  margin-bottom: var(--spacing-lg);
  letter-spacing: 2px;
}

.hero__title {
  font-size: var(--font-size-6xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-xl);
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero__title span {
  display: block;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-3xl);
  line-height: var(--line-height-relaxed);
}

.hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-4xl);
}

.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-4xl);
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-family-en);
}

.hero__stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  margin-top: var(--spacing-xs);
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  color: rgba(255, 255, 255, 0.6);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ============================================
   通用区域标题
   ============================================ */
.section {
  padding: var(--spacing-5xl) 0;
}

.section--dark {
  background: var(--bg-dark);
  color: var(--text-inverse);
}

.section--gray {
  background: var(--bg-secondary);
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-4xl);
}

.section__label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-md);
}

.section__title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.section--dark .section__title {
  color: var(--text-inverse);
}

.section__desc {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

.section--dark .section__desc {
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   服务卡片
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.service-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-3xl) var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

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

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

.service-card__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-xl);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
}

.service-card__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.service-card__desc {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   行业覆盖
   ============================================ */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.industry-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
  cursor: pointer;
}

.industry-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.industry-card__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.industry-card__icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
}

.industry-card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.industry-card__subtitle {
  font-size: var(--font-size-xs, 12px);
  color: var(--text-tertiary);
  margin-top: 2px;
  letter-spacing: 0.02em;
}

.industry-card__desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

.industry-card__list {
  /* 暂时隐藏单位 logo 与名称列表（规避商标侵权风险）
     恢复时改回：display: grid; grid-template-columns: repeat(auto-fill, minmax(136px, 1fr));
     gap: 10px; margin-top: auto; */
  display: none;
}

.industry-card__tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 7px 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.industry-card__tag:hover {
  color: var(--text-primary);
  background: var(--border-light);
}

.industry-card__tag-logo {
  width: 22px;
  height: 22px;
  object-fit: contain;
  background: #fff;
  border-radius: 5px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06);
  flex-shrink: 0;
}

/* ============================================
   课程卡片
   ============================================ */
.courses-slider {
  display: flex;
  gap: var(--spacing-xl);
  overflow-x: auto;
  padding-bottom: var(--spacing-md);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.courses-slider::-webkit-scrollbar {
  height: 6px;
}

.courses-slider::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

.courses-slider::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 3px;
}

.course-card {
  flex: 0 0 300px;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
  scroll-snap-align: start;
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.course-card__image {
  position: relative;
  height: 180px;
  overflow: hidden;
}

.course-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform var(--transition-normal);
}

.course-card:hover .course-card__image img {
  transform: scale(1.05);
}

.course-card__badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 12px;
  background: var(--accent);
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.course-card__content {
  padding: var(--spacing-lg);
}

.course-card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.course-card__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.course-card__price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--error);
  margin-left: var(--spacing-sm);
}

.course-card__price-original {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  text-decoration: line-through;
}

/* ============================================
   师资团队
   ============================================ */
.teachers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.teacher-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

.teacher-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.teacher-card__image {
  position: relative;
  height: 280px;
  overflow: hidden;
}

.teacher-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.teacher-card:hover .teacher-card__image img {
  transform: scale(1.05);
}

.teacher-card__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-lg);
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: var(--text-inverse);
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.teacher-card:hover .teacher-card__overlay {
  transform: translateY(0);
}

.teacher-card__overlay-text {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.teacher-card__info {
  padding: var(--spacing-lg);
  text-align: center;
}

.teacher-card__name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.teacher-card__title {
  font-size: var(--font-size-sm);
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
}

.teacher-card__tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-xs);
}

.teacher-card__tag {
  padding: 4px 10px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* ============================================
   品牌优势
   ============================================ */
.advantages-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4xl);
}

.advantage-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-4xl);
}

.advantage-item:nth-child(even) {
  flex-direction: row-reverse;
}

.advantage-item__image {
  flex: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.advantage-item__image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.advantage-item__content {
  flex: 1;
}

.advantage-item__number {
  font-size: var(--font-size-6xl);
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-family-en);
  opacity: 0.3;
  margin-bottom: var(--spacing-md);
}

.advantage-item__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.advantage-item__desc {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-xl);
}

.advantage-item__list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.advantage-item__list-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

.advantage-item__list-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  margin-top: 2px;
}

/* ============================================
   学员案例
   ============================================ */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.case-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.case-card__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.case-card__avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
}

.case-card__info {
  flex: 1;
}

.case-card__name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.case-card__school {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.case-card__company {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.case-card__quote {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  font-style: italic;
  position: relative;
  padding-left: var(--spacing-lg);
}

.case-card__quote::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -5px;
  font-size: var(--font-size-4xl);
  color: var(--accent);
  font-family: Georgia, serif;
}

/* ============================================
   新闻资讯
   ============================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.news-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

.news-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.news-card__image {
  position: relative;
  height: 200px;
  overflow: hidden;
  background: #fff; /* 图片完整显示时，留白处为白色背景 */
}

.news-card__image img {
  width: 100%;
  height: 100%;
  object-fit: contain; /* 完整显示图片，不裁剪左右 */
  transition: transform var(--transition-normal);
}

.news-card:hover .news-card__image img {
  transform: scale(1.05);
}

.news-card__category {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  background: var(--primary);
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.news-card__content {
  padding: var(--spacing-lg);
}

.news-card__date {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-sm);
}

.news-card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}

.news-card:hover .news-card__title {
  color: var(--primary);
}

.news-card__summary {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   CTA区域
   ============================================ */
.cta {
  position: relative;
  padding: var(--spacing-5xl) 0;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  overflow: hidden;
}

.cta__bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(197, 160, 89, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(197, 160, 89, 0.15) 0%, transparent 50%);
}

.cta__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--text-inverse);
  max-width: 700px;
  margin: 0 auto;
}

.cta__title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.cta__desc {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-3xl);
  line-height: var(--line-height-relaxed);
}

.cta__actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-4xl) 0 0;
}

.footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-3xl);
  padding-bottom: var(--spacing-4xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.footer__logo img {
  height: 40px;
}

.footer__logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-inverse);
}

.footer__desc {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.6);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-xl);
}

.footer__social {
  display: flex;
  gap: var(--spacing-md);
}

.footer__social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.8);
  transition: all var(--transition-normal);
}

.footer__social-link:hover {
  background: var(--accent);
  color: var(--text-inverse);
}

.footer__column-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-inverse);
  margin-bottom: var(--spacing-xl);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer__link {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--accent);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.6);
}

.footer__contact-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--accent);
  margin-top: 2px;
}

.footer__bottom {
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.4);
}

.footer__icp {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.4);
  margin-top: var(--spacing-sm);
}

.footer__icp a {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition-fast);
}

.footer__icp a:hover {
  color: var(--accent);
}

/* ============================================
   工具类
   ============================================ */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: var(--primary);
}

.text-accent {
  color: var(--accent);
}

.text-white {
  color: var(--text-inverse);
}

.bg-primary {
  background-color: var(--primary);
}

.bg-accent {
  background-color: var(--accent);
}

.bg-dark {
  background-color: var(--bg-dark);
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }
.mt-4 { margin-top: var(--spacing-2xl); }
.mt-5 { margin-top: var(--spacing-3xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }
.mb-4 { margin-bottom: var(--spacing-2xl); }
.mb-5 { margin-bottom: var(--spacing-3xl); }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: var(--spacing-md); }
.pt-2 { padding-top: var(--spacing-lg); }
.pt-3 { padding-top: var(--spacing-xl); }
.pt-4 { padding-top: var(--spacing-2xl); }
.pt-5 { padding-top: var(--spacing-3xl); }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: var(--spacing-md); }
.pb-2 { padding-bottom: var(--spacing-lg); }
.pb-3 { padding-bottom: var(--spacing-xl); }
.pb-4 { padding-bottom: var(--spacing-2xl); }
.pb-5 { padding-bottom: var(--spacing-3xl); }

/* ============================================
   动画类
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* ============================================
   页面Banner
   ============================================ */
.page-banner {
  position: relative;
  height: 400px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-inverse);
  overflow: hidden;
  margin-top: 80px;
}

.page-banner__bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 30% 50%, rgba(197, 160, 89, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(197, 160, 89, 0.1) 0%, transparent 50%);
}

.page-banner__content {
  position: relative;
  z-index: 1;
}

.page-banner__title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.page-banner__subtitle {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   表单样式
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--font-size-base);
  font-family: inherit;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

/* ============================================
   卡片网格布局
   ============================================ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

/* ============================================
   时间轴
   ============================================ */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-3xl);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item__dot {
  position: absolute;
  left: -40px;
  top: 5px;
  width: 30px;
  height: 30px;
  background: var(--bg-primary);
  border: 3px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-item__dot::after {
  content: '';
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
}

.timeline-item__year {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
}

.timeline-item__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.timeline-item__desc {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   分页
   ============================================ */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-3xl);
}

.pagination__btn {
  padding: 10px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination__btn:hover,
.pagination__btn--active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-inverse);
}

/* ============================================
   标签
   ============================================ */
.tag {
  display: inline-block;
  padding: 6px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.tag:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
}

.tag:active {
  transform: scale(0.94);
}

.tag--primary {
  background: rgba(30, 58, 95, 0.1);
  border-color: rgba(30, 58, 95, 0.25);
  color: var(--primary);
  font-weight: 600;
}

.tag--accent {
  background: rgba(197, 160, 89, 0.1);
  color: var(--accent);
}

/* ============================================
   徽章
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
}

.badge--primary {
  background: var(--primary);
  color: var(--text-inverse);
}

.badge--accent {
  background: var(--accent);
  color: var(--text-inverse);
}

.badge--success {
  background: var(--success);
  color: var(--text-inverse);
}

/* ============================================
   分割线
   ============================================ */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--spacing-3xl) 0;
}

.divider--accent {
  background: var(--accent);
}

/* ============================================
   引用块
   ============================================ */
.blockquote {
  padding: var(--spacing-xl);
  border-left: 4px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--spacing-xl) 0;
}

.blockquote__text {
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

.blockquote__author {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================
   加载动画
   ============================================ */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl);
}

.loading__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   返回顶部
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: var(--text-inverse);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: var(--z-fixed);
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

/* ============================================
   响应式基础
   ============================================ */
@media (max-width: 1200px) {
  .container {
    max-width: 960px;
  }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

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

@media (max-width: 992px) {
  .container {
    max-width: 720px;
  }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__stats {
    gap: var(--spacing-2xl);
  }

  .advantage-item {
    flex-direction: column !important;
    gap: var(--spacing-2xl);
  }

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

@media (max-width: 768px) {
  .container {
    max-width: 540px;
  }

  .header__nav {
    display: none;
  }

  .header__menu-btn {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }

  .hero__title {
    font-size: var(--font-size-3xl);
  }

  .hero__desc {
    font-size: var(--font-size-base);
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .hero__stats {
    flex-wrap: wrap;
    gap: var(--spacing-xl);
  }

  .section {
    padding: var(--spacing-3xl) 0;
  }

  .section__title {
    font-size: var(--font-size-2xl);
  }

  .services-grid,
  .industries-grid,
  .cases-grid,
  .news-grid,
  .teachers-grid {
    grid-template-columns: 1fr;
  }

  .page-banner {
    height: 300px;
  }

  .page-banner__title {
    font-size: var(--font-size-3xl);
  }

  .footer__main {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .footer__brand {
    max-width: 100%;
  }
}

@media (max-width: 576px) {
  html {
    font-size: 14px;
  }

  .hero__title {
    font-size: var(--font-size-2xl);
  }

  .hero__stat-number {
    font-size: var(--font-size-2xl);
  }

  .section__title {
    font-size: var(--font-size-xl);
  }

  .btn {
    padding: 10px 20px;
    font-size: var(--font-size-sm);
  }

  .btn--large {
    padding: 12px 24px;
    font-size: var(--font-size-base);
  }
}

/* ========== 金牌师资 ========== */
.gold-teachers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.gold-teacher-card {
  display: grid;
  grid-template-columns: 150px 1fr;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gold-teacher-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(30, 58, 95, 0.15);
}

.gold-teacher-card__image {
  position: relative;
  min-height: 190px;
  overflow: hidden;
}

.gold-teacher-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
}

.gold-teacher-card__badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: var(--text-inverse);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  line-height: 1.5;
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

.gold-teacher-card__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 20px;
}

.gold-teacher-card__header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.gold-teacher-card__name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.gold-teacher-card__title {
  font-size: var(--font-size-sm);
  color: var(--accent-dark);
  font-weight: 600;
  margin: 0;
}

.gold-teacher-card__intro {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.8;
}

.gold-teacher-card__works {
  margin: 0;
  font-size: 13px;
  color: var(--text-tertiary);
  line-height: 1.7;
}

.gold-teacher-card__highlight {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  background: linear-gradient(135deg, rgba(197, 160, 89, 0.12) 0%, rgba(197, 160, 89, 0.05) 100%);
  border: 1px solid rgba(197, 160, 89, 0.35);
  border-radius: var(--radius-md);
  padding: 6px 14px;
  font-size: 13px;
  color: var(--accent-dark);
  font-weight: 600;
}

.gold-teacher-card__highlight strong {
  font-size: var(--font-size-lg);
  font-family: var(--font-family-en);
}

/* 师资筛选隐藏 */
.is-hidden {
  display: none !important;
}

@media (max-width: 768px) {
  .gold-teachers {
    grid-template-columns: 1fr;
  }

  .gold-teacher-card {
    grid-template-columns: 110px 1fr;
  }

  .gold-teacher-card__body {
    padding: 12px 14px;
  }
}