/* ========================================
   勤博士AI官网 - 共享样式系统
   三套主题：科技蓝 / 橙色 / 红色
   ======================================== */

/* --- 主题变量 --- */
:root,
[data-theme="blue"] {
  --primary: #1B6CFF;
  --primary-light: #4D94FF;
  --primary-dark: #0A4EDB;
  --primary-soft: rgba(27, 108, 255, 0.08);
  --primary-soft-2: rgba(27, 108, 255, 0.04);
  --accent: #00D4FF;
  --gradient: linear-gradient(135deg, #1B6CFF 0%, #00D4FF 100%);
  --gradient-soft: linear-gradient(135deg, rgba(27, 108, 255, 0.1) 0%, rgba(0, 212, 255, 0.05) 100%);
  --hero-bg: radial-gradient(ellipse at top right, rgba(27, 108, 255, 0.12) 0%, transparent 60%),
             radial-gradient(ellipse at bottom left, rgba(0, 212, 255, 0.08) 0%, transparent 50%);
  --theme-name: "科技蓝";
}

[data-theme="orange"] {
  --primary: #FF7A00;
  --primary-light: #FFA040;
  --primary-dark: #E66200;
  --primary-soft: rgba(255, 122, 0, 0.08);
  --primary-soft-2: rgba(255, 122, 0, 0.04);
  --accent: #FFB800;
  --gradient: linear-gradient(135deg, #FF7A00 0%, #FFB800 100%);
  --gradient-soft: linear-gradient(135deg, rgba(255, 122, 0, 0.1) 0%, rgba(255, 184, 0, 0.05) 100%);
  --hero-bg: radial-gradient(ellipse at top right, rgba(255, 122, 0, 0.12) 0%, transparent 60%),
             radial-gradient(ellipse at bottom left, rgba(255, 184, 0, 0.08) 0%, transparent 50%);
  --theme-name: "活力橙";
}

[data-theme="red"] {
  --primary: #E6324B;
  --primary-light: #FF5A72;
  --primary-dark: #C41E36;
  --primary-soft: rgba(230, 50, 75, 0.08);
  --primary-soft-2: rgba(230, 50, 75, 0.04);
  --accent: #FF6B8A;
  --gradient: linear-gradient(135deg, #E6324B 0%, #FF6B8A 100%);
  --gradient-soft: linear-gradient(135deg, rgba(230, 50, 75, 0.1) 0%, rgba(255, 107, 138, 0.05) 100%);
  --hero-bg: radial-gradient(ellipse at top right, rgba(230, 50, 75, 0.12) 0%, transparent 60%),
             radial-gradient(ellipse at bottom left, rgba(255, 107, 138, 0.08) 0%, transparent 50%);
  --theme-name: "中国红";
}

/* --- 通用变量 --- */
:root {
  --bg: #F7F9FC;
  --bg-card: #FFFFFF;
  --bg-dark: #0B1426;
  --text-primary: #1A2233;
  --text-secondary: #5A6478;
  --text-light: #939FB5;
  --border: rgba(0, 0, 0, 0.06);
  --border-strong: rgba(0, 0, 0, 0.12);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
  --shadow-primary: 0 12px 40px rgba(27, 108, 255, 0.2);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --max-width: 1280px;
  --nav-height: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Courier New", monospace;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* --- 布局容器 --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-sm {
  padding: 64px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 64px;
}

.section-title .eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding: 6px 16px;
  background: var(--primary-soft);
  border-radius: 100px;
}

.section-title h2 {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-title p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* --- 导航栏 --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: all var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.nav-logo .logo-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  box-shadow: var(--shadow-primary);
  flex-shrink: 0;
}

.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-logo .logo-text .sub {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-light);
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all var(--transition);
  position: relative;
}

.nav-menu a:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.nav-menu a.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-menu a.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  border-radius: 3px;
  background: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --- 主题切换器 --- */
.theme-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100px;
}

.theme-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  position: relative;
}

.theme-dot[data-color="blue"] { background: #1B6CFF; }
.theme-dot[data-color="orange"] { background: #FF7A00; }
.theme-dot[data-color="red"] { background: #E6324B; }

.theme-dot.active {
  border-color: #fff;
  box-shadow: 0 0 0 2px var(--primary);
  transform: scale(1.1);
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 48px rgba(27, 108, 255, 0.3);
  filter: brightness(1.05);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-strong);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

.btn-ghost {
  background: var(--primary-soft);
  color: var(--primary);
}

.btn-ghost:hover {
  background: var(--primary);
  color: #fff;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
}

/* --- Hero区 --- */
.hero {
  padding: calc(var(--nav-height) + 80px) 0 100px;
  background: var(--hero-bg);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero h1 .highlight {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p.lead {
  font-size: 19px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.hero-stat .num {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.hero-stat .label {
  font-size: 14px;
  color: var(--text-light);
  margin-top: 4px;
}

/* Hero 右侧视觉 */
.hero-visual {
  position: relative;
  height: 480px;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  animation: float 6s ease-in-out infinite;
}

.hero-orb-1 {
  width: 280px;
  height: 280px;
  top: 40px;
  right: 60px;
  background: var(--gradient);
  opacity: 0.9;
  box-shadow: 0 30px 80px rgba(27, 108, 255, 0.3);
}

.hero-orb-2 {
  width: 140px;
  height: 140px;
  bottom: 60px;
  left: 20px;
  background: var(--gradient);
  opacity: 0.7;
  animation-delay: -2s;
}

.hero-orb-3 {
  width: 80px;
  height: 80px;
  top: 20px;
  left: 80px;
  background: var(--accent);
  opacity: 0.6;
  animation-delay: -4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero-card-float {
  position: absolute;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 600;
  animation: float 5s ease-in-out infinite;
}

.hero-card-float .icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
}

.hero-card-1 {
  top: 80px;
  left: 0;
  animation-delay: -1s;
}

.hero-card-2 {
  bottom: 100px;
  right: 0;
  animation-delay: -3s;
}

/* --- 产品卡片 --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

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

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

.product-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 24px;
}

.product-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.product-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.product-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.product-card .tag {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 6px;
  font-weight: 500;
}

/* --- 业务板块 --- */
.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.business-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  gap: 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

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

.business-card .biz-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: #fff;
  flex-shrink: 0;
}

.business-card .biz-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.business-card .biz-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.business-card .biz-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.business-card .biz-feature {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.business-card .biz-feature::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
}

/* --- 解决方案标签筛选 --- */
.solutions-section {
  background: var(--bg-card);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 48px;
}

.filter-tag {
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 100px;
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-tag:hover,
.filter-tag.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.solution-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition);
}

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

.solution-card .sol-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}

.solution-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}

.solution-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 资讯动态 --- */
.news-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 24px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

/* 特色文章 — 左侧大卡 */
.news-card.featured {
  grid-row: span 2;
}

.news-card.featured .news-thumb {
  height: 240px;
}

.news-card.featured .news-body {
  padding: 32px;
}

.news-card.featured .news-title {
  font-size: 22px;
  line-height: 1.4;
}

.news-card.featured .news-excerpt {
  font-size: 14px;
  -webkit-line-clamp: 3;
}

/* 缩略图 */
.news-thumb {
  height: 160px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.news-thumb .news-thumb-icon {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.15;
  letter-spacing: -0.02em;
}

.news-thumb .news-cat-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: var(--gradient);
  border-radius: 100px;
}

.news-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 12px;
}

.news-meta .news-date {
  display: flex;
  align-items: center;
  gap: 5px;
}

.news-meta .news-date::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
}

.news-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 10px;
  transition: color var(--transition);
}

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

.news-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
  flex: 1;
}

.news-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.news-read-more {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.news-card:hover .news-read-more {
  gap: 8px;
}

.news-read-more::after {
  content: "→";
  font-size: 15px;
}

.news-views {
  font-size: 12px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 5px;
}

.news-views::before {
  content: "👁";
  font-size: 13px;
}

/* 资讯动态底部查看更多 */
.news-more-bar {
  text-align: center;
  margin-top: 48px;
}

/* --- 媒体矩阵 --- */
.media-matrix {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.media-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
}

.media-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}

.media-item .media-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
  flex-shrink: 0;
}

.media-item:nth-child(1) .media-icon { background: #000; }
.media-item:nth-child(2) .media-icon { background: #FF2442; }
.media-item:nth-child(3) .media-icon { background: #FF6600; }
.media-item:nth-child(4) .media-icon { background: #07C160; }
.media-item:nth-child(5) .media-icon { background: #1AAD19; }

.media-item .media-name {
  font-size: 14px;
  font-weight: 600;
}

.media-item .media-desc {
  font-size: 12px;
  color: var(--text-light);
}

/* --- 团队卡片 --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
}

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

.team-card::after {
  content: "查看详情";
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--primary);
  opacity: 0;
  transition: opacity 0.2s;
  font-weight: 500;
}

.team-card:hover::after {
  opacity: 1;
}

.team-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: #fff;
  font-weight: 700;
}

.team-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.team-card .role {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 12px;
}

.team-card .bio {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 公司资质卡片 --- */
.qual-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.qual-card {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all var(--transition);
}

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

.qual-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.qual-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- 企业文化卡片 --- */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.culture-card {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all var(--transition);
}

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

.culture-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.culture-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

@media (max-width: 992px) {
  .qual-grid, .culture-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .qual-grid, .culture-grid { grid-template-columns: 1fr; }
}

/* --- 时间线 --- */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
}

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

.timeline-dot {
  position: absolute;
  left: -34px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 3px solid var(--primary);
  z-index: 1;
}

.timeline-year {
  font-size: 16px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.timeline-content h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- 创始人介绍 --- */
.founder-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 60px;
  align-items: center;
}

.founder-card {
  text-align: center;
}

.founder-avatar {
  width: 240px;
  height: 240px;
  border-radius: var(--radius-lg);
  margin: 0 auto 28px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  color: #fff;
  font-weight: 700;
  box-shadow: var(--shadow-primary);
}

.founder-card .founder-name {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
}

.founder-card .founder-title {
  font-size: 15px;
  color: var(--primary);
  font-weight: 600;
}

.founder-info h3 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.founder-info .bio {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 28px;
}

.founder-credentials {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.credential-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.credential-item .check {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.credential-item .text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.credential-item .text strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}

/* --- 技术体系 --- */
.tech-stack {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.tech-layer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}

.tech-layer:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}

.tech-layer .layer-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin: 0 auto 16px;
}

.tech-layer h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}

.tech-layer p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 联系页面 --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.contact-info-item:last-child {
  margin-bottom: 0;
}

.contact-info-item .icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.contact-info-item .info-label {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 4px;
}

.contact-info-item .info-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  padding: 6px 0;
  cursor: pointer;
  user-select: none;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 16px 20px;
  font-size: 15px;
  font-family: inherit;
  border: 1.5px solid var(--border-strong);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text-primary);
  transition: all var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* --- 创始人CTA --- */
.cta-banner {
  background: var(--gradient);
  border-radius: var(--radius-xl);
  padding: 64px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
}

.cta-banner::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.cta-banner h2 {
  font-size: 36px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.cta-banner .btn {
  background: #fff;
  color: var(--primary);
  position: relative;
  z-index: 1;
}

.cta-banner .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

/* --- 页脚 --- */
.footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 72px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .nav-logo {
  color: #fff;
  margin-bottom: 20px;
}

.footer-brand .nav-logo .logo-text .sub {
  color: rgba(255, 255, 255, 0.5);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* --- 悬浮AI机器人 --- */
.ai-fab {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.ai-chat-panel {
  width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: scale(0) translateY(20px);
  transform-origin: bottom right;
  opacity: 0;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}

.ai-chat-panel.open {
  transform: scale(1) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.ai-chat-header {
  background: var(--gradient);
  color: #fff;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.ai-chat-header .ai-avatar {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.ai-chat-header .ai-info h4 {
  font-size: 16px;
  font-weight: 700;
}

.ai-chat-header .ai-info .status {
  font-size: 12px;
  opacity: 0.85;
  display: flex;
  align-items: center;
  gap: 5px;
}

.ai-chat-header .ai-info .status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
}

.ai-chat-header .ai-close {
  margin-left: auto;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  border: none;
  color: #fff;
  transition: background var(--transition);
}

.ai-chat-header .ai-close:hover {
  background: rgba(255, 255, 255, 0.3);
}

.ai-chat-body {
  padding: 20px;
  max-height: 400px;
  overflow-y: auto;
}

.ai-msg {
  margin-bottom: 16px;
}

.ai-msg-bot {
  display: flex;
  gap: 10px;
}

.ai-msg-bot .avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.ai-msg-bot .bubble {
  background: var(--bg);
  border-radius: 14px 14px 14px 4px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.6;
  max-width: 280px;
}

.ai-quick-questions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.ai-quick-q {
  padding: 7px 14px;
  font-size: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid transparent;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.ai-quick-q:hover {
  background: var(--primary);
  color: #fff;
}

.ai-chat-input {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
}

.ai-chat-input input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  background: var(--bg);
  color: var(--text-primary);
}

.ai-chat-input input:focus {
  outline: none;
  border-color: var(--primary);
}

.ai-chat-input button {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 10px;
  background: var(--gradient);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.ai-chat-input button:hover {
  filter: brightness(1.1);
}

.ai-fab-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gradient);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 26px;
  box-shadow: var(--shadow-primary);
  transition: all var(--transition);
  position: relative;
}

.ai-fab-btn:hover {
  transform: scale(1.08);
}

.ai-fab-btn .pulse-ring {
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  animation: ring 2s ease-out infinite;
}

@keyframes ring {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(1.4); opacity: 0; }
}

/* --- 滚动动画（渐进增强：JS 未就绪时内容默认可见，防止内容消失） --- */
.fade-in-up {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

html.anim-ready .fade-in-up {
  opacity: 0;
  transform: translateY(30px);
}

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

/* --- 移动端菜单 --- */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========================================
   v2.0 新增模块样式
   ======================================== */

/* --- 共创中心：生态角色卡片 --- */
.eco-role-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.eco-role-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.eco-role-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.eco-role-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

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

.eco-role-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin: 0 auto 20px;
}

.eco-role-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.eco-role-card .role-tag {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 16px;
  padding: 4px 12px;
  background: var(--primary-soft);
  border-radius: 100px;
  display: inline-block;
}

.eco-role-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  text-align: left;
}

.eco-role-card ul {
  text-align: left;
  margin-top: 16px;
}

.eco-role-card ul li {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 4px 0;
  padding-left: 18px;
  position: relative;
}

.eco-role-card ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

/* --- 共创中心：产业闭环 --- */
.eco-loop {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.eco-loop-node {
  background: var(--bg-card);
  border: 2px solid var(--primary-soft);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  text-align: center;
  min-width: 140px;
  transition: all var(--transition);
}

.eco-loop-node:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}

.eco-loop-node .node-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.eco-loop-node .node-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.eco-loop-node .node-desc {
  font-size: 11px;
  color: var(--text-light);
  margin-top: 4px;
}

.eco-loop-arrow {
  font-size: 24px;
  color: var(--primary);
  opacity: 0.5;
}

/* --- 共创中心：会员价格卡片 --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-primary);
}

.pricing-card.popular::before {
  content: "热门";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 100px;
  white-space: nowrap;
}

.pricing-card .plan-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.pricing-card .plan-price {
  font-size: 32px;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.pricing-card .plan-price .unit {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
}

.pricing-card .plan-desc {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.pricing-card .plan-features {
  text-align: left;
  margin-bottom: 24px;
}

.pricing-card .plan-features li {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 5px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}

.pricing-card .plan-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
  font-size: 11px;
}

.pricing-card .plan-features li.disabled {
  color: var(--text-light);
  opacity: 0.6;
}

.pricing-card .plan-features li.disabled::before {
  content: "✕";
  color: var(--text-light);
}

/* --- 共创中心：权益对比表 --- */
.benefits-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.benefits-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 900px;
  background: var(--bg-card);
}

.benefits-table th,
.benefits-table td {
  padding: 14px 16px;
  text-align: center;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}

.benefits-table th {
  background: var(--bg);
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  position: sticky;
  top: 0;
}

.benefits-table th:first-child,
.benefits-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 180px;
}

.benefits-table .th-popular {
  background: var(--primary-soft);
  color: var(--primary);
}

.benefits-table tbody tr:hover {
  background: var(--primary-soft-2);
}

.benefits-table .check { color: #22c55e; font-weight: 700; }
.benefits-table .cross { color: var(--text-light); }
.benefits-table .partial { color: var(--accent); }

/* --- 企业大学：课程卡片 --- */
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.course-thumb {
  height: 160px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.course-thumb .course-thumb-icon {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.15;
}

.course-thumb .course-level {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  border-radius: 100px;
}

.course-thumb .course-level.free { background: #22c55e; }
.course-thumb .course-level.paid { background: var(--primary); }
.course-thumb .course-level.vip { background: #f59e0b; }

/* 课程卡片：配置视频地址后可点击跳转 */
.course-card[data-video-url] { cursor: pointer; }
.course-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.22);
  opacity: 0;
  transition: opacity var(--transition);
}
.course-card:hover .course-play { opacity: 1; }
.course-play::before {
  content: "";
  position: absolute;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(2px);
}
.course-play svg { position: relative; filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.35)); }

.course-body .course-cat .course-video-tag {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  background: #22c55e;
  border-radius: 100px;
  vertical-align: 1px;
}

.course-body {
  padding: 20px;
}

.course-body .course-cat {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.course-body h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
}

.course-body .course-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.course-meta .course-instructor {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
}

.course-meta .course-instructor .avatar-sm {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

.course-meta .course-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-light);
}

/* --- 企业大学：讲师卡片 --- */
.instructor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.instructor-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}

.instructor-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.instructor-card[data-video-url] { cursor: pointer; }

.instructor-card .ins-avatar-wrap {
  position: relative;
  width: 80px;
  margin: 0 auto 16px;
}

.instructor-card .ins-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: #fff;
  font-weight: 700;
  overflow: hidden;
}

.instructor-card .ins-play {
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.instructor-card .ins-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.instructor-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
}

.instructor-card .ins-title {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 12px;
}

.instructor-card .ins-bio {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.instructor-card .ins-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.instructor-card .ins-stat .num {
  font-size: 18px;
  font-weight: 800;
  color: var(--primary);
}

.instructor-card .ins-stat .label {
  font-size: 11px;
  color: var(--text-light);
}

/* --- 用户工作台 --- */
.dash-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}

.dash-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.dash-user-card {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.dash-user-card .dash-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin: 0 auto 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: #fff;
  font-weight: 700;
}

.dash-user-card .dash-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.dash-user-card .dash-role {
  font-size: 12px;
  color: var(--primary);
  font-weight: 500;
}

.dash-menu { display: flex; flex-direction: column; gap: 2px; }

.dash-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--transition);
}

.dash-menu-item:hover {
  background: var(--primary-soft);
  color: var(--primary);
}

.dash-menu-item.active {
  background: var(--primary);
  color: #fff;
}

.dash-menu-item .icon-sm {
  width: 20px;
  text-align: center;
  font-size: 16px;
}

.dash-content { min-height: 600px; }

.dash-section { display: none; }
.dash-section.active { display: block; }

.dash-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.dash-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.dash-stat-card .stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 16px;
}

.dash-stat-card .stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.dash-stat-card .stat-label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

/* 双会员卡片 */
.dual-membership {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

.membership-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  overflow: hidden;
}

.membership-card .mem-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 700;
  border-radius: 100px;
}

.membership-card .mem-badge.normal { background: var(--primary-soft); color: var(--primary); }
.membership-card .mem-badge.cocreation { background: linear-gradient(135deg, #f59e0b, #ef4444); color: #fff; }

.membership-card .mem-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.membership-card .mem-level {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 16px;
}

.membership-card .mem-info {
  display: flex;
  gap: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
}

.membership-card .mem-info-item .label {
  font-size: 12px;
  color: var(--text-light);
}

.membership-card .mem-info-item .value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2px;
}

/* 分销面板 */
.dist-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
}

.dist-link-box {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 16px 0;
}

.dist-link-box .dist-link {
  flex: 1;
  font-size: 13px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dist-share-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.dist-share-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--text-primary);
}

.dist-share-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* 进度条 */
.progress-bar {
  height: 8px;
  background: var(--bg);
  border-radius: 100px;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: var(--gradient);
  border-radius: 100px;
  transition: width 0.6s ease;
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.3;
}

/* --- 生态入口横幅 --- */
.eco-banner {
  background: var(--gradient);
  border-radius: var(--radius-xl);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.eco-banner::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
}

.eco-banner h2 {
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.eco-banner p {
  font-size: 16px;
  color: rgba(255,255,255,0.9);
  line-height: 1.8;
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
}

.eco-banner .btn {
  background: #fff;
  color: var(--primary);
  position: relative;
  z-index: 1;
}

.eco-banner-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  position: relative;
  z-index: 1;
}

.eco-banner-stat {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.eco-banner-stat .num {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}

.eco-banner-stat .label {
  font-size: 12px;
  color: rgba(255,255,255,0.8);
  margin-top: 4px;
}

/* --- 学习路径 --- */
.learn-path {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.learn-path-node {
  background: var(--bg-card);
  border: 2px solid var(--primary-soft);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  text-align: center;
  min-width: 120px;
}

.learn-path-node .step {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 4px;
}

.learn-path-node .title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

/* --- 响应式 --- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 42px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-stack { grid-template-columns: repeat(3, 1fr); }
  .news-grid { grid-template-columns: 1fr 1fr; }
  .news-card.featured { grid-row: span 1; grid-column: span 2; }
  .news-card.featured .news-thumb { height: 200px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .eco-role-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(3, 1fr); }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .instructor-grid { grid-template-columns: repeat(2, 1fr); }
  .dash-layout { grid-template-columns: 1fr; }
  .dash-sidebar { position: static; }
  .dash-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dual-membership { grid-template-columns: 1fr; }
  .eco-banner { grid-template-columns: 1fr; padding: 40px 32px; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .section-title h2 { font-size: 30px; }
  .section-title { margin-bottom: 40px; }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-md);
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .nav-menu a {
    width: 100%;
    padding: 14px 18px;
  }

  .nav-toggle { display: flex; }
  .nav-actions .theme-switcher { display: none; }

  .hero { padding: calc(var(--nav-height) + 40px) 0 60px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 34px; }
  .hero p.lead { font-size: 16px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-visual { display: none; }

  .product-grid { grid-template-columns: 1fr; }
  .business-grid { grid-template-columns: 1fr; }
  .business-card { padding: 28px; }
  .solution-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .tech-stack { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: 1fr; }
  .news-card.featured { grid-column: span 1; }
  .eco-role-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: 1fr; }
  .instructor-grid { grid-template-columns: 1fr 1fr; }
  .dash-stats-grid { grid-template-columns: 1fr 1fr; }
  .eco-banner-stats { grid-template-columns: 1fr; }

  .founder-section { grid-template-columns: 1fr; gap: 32px; text-align: center; }
  .founder-credentials { grid-template-columns: 1fr; }

  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

  .cta-banner { padding: 40px 24px; }
  .cta-banner h2 { font-size: 26px; }

  .ai-chat-panel { width: calc(100vw - 40px); max-width: 380px; }
}


/* --- 团队详情弹窗 --- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(4px);
}
.modal-content {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  overflow: hidden;
  animation: modalIn 0.25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
}
.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: none;
  background: var(--bg);
  color: var(--text-light);
  font-size: 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.modal-close:hover {
  background: var(--border);
  color: var(--text);
}
.modal-body {
  padding: 24px;
  overflow-y: auto;
  max-height: calc(80vh - 70px);
}

/* --- 地址链接（点击选择地图导航） --- */
.addr-link {
  color: var(--primary);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: opacity 0.2s;
  word-break: break-all;
}
.addr-link:hover {
  opacity: 0.75;
}

/* --- 地图导航按钮组 --- */
.map-launch-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- 地图选择列表（弹窗） --- */
.map-choice-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.map-choice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}
.map-choice:hover {
  border-color: var(--primary);
  background: var(--bg-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}
.map-choice-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
}

/* --- 导航栏用户下拉菜单 --- */
.nav-user-dropdown {
  position: relative;
  display: inline-block;
  vertical-align: middle;
}
.nav-user-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}
.nav-user-trigger:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.nav-user-trigger #nav-user-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.nav-user-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 140px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.2s ease;
  z-index: 1000;
}
.nav-user-dropdown.open .nav-user-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-user-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
}
.nav-user-menu a:hover {
  background: var(--primary-soft);
  color: var(--primary);
}
.nav-user-menu a + a {
  margin-top: 2px;
}