/* ===== 全局变量 ===== */
:root {
  --primary: #E53935;
  --primary-dark: #B71C1C;
  --primary-light: #FF6B6B;
  --primary-glow: rgba(229, 57, 53, 0.4);
  --accent-blue: #00D4FF;
  --accent-purple: #A855F7;
  --accent-gold: #F59E0B;
  --bg-dark: #0A0E1A;
  --bg-darker: #060912;
  --bg-card: #111827;
  --bg-card-hover: #1A2235;
  --text-primary: #FFFFFF;
  --text-secondary: #B8C5D6;
  --text-muted: #6B7280;
  --border: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(229, 57, 53, 0.5);
  --gradient-primary: linear-gradient(135deg, #E53935 0%, #FF6B6B 100%);
  --gradient-text: linear-gradient(135deg, #FF6B6B 0%, #E53935 40%, #F59E0B 70%, #00D4FF 100%);
  --gradient-hero: linear-gradient(135deg, rgba(229,57,53,0.15) 0%, rgba(0,212,255,0.1) 50%, rgba(168,85,247,0.1) 100%);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 50px rgba(229, 57, 53, 0.2);
  --shadow-glow-blue: 0 0 50px rgba(0, 212, 255, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ===== 自定义滚动条 - 深色科技风 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darker);
  border-left: 1px solid var(--border);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary) 0%, var(--accent-blue) 100%);
  border-radius: 100px;
  border: 2px solid var(--bg-darker);
  transition: all 0.3s ease;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--accent-blue) 100%);
  box-shadow: 0 0 12px rgba(229, 57, 53, 0.5);
}
::-webkit-scrollbar-corner {
  background: var(--bg-darker);
}
/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--primary) var(--bg-darker);
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1440px; margin: 0 auto; padding: 0 32px; }

/* ===== 导航栏 - 科技感升级 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
  background: rgba(10, 14, 26, 0.6);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.navbar::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(229,57,53,0.6), rgba(0,212,255,0.4), transparent);
  opacity: 0.7;
}
.navbar.scrolled {
  background: rgba(6, 9, 18, 0.92);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.5), 0 0 40px rgba(229,57,53,0.08);
}
.navbar.scrolled::after {
  opacity: 1;
  width: 80%;
}
.nav-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}
.logo-glow {
  position: absolute;
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--primary);
  filter: blur(12px);
  opacity: 0.5;
  animation: logoPulse 3s ease-in-out infinite;
  z-index: 0;
}
@keyframes logoPulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.15); }
}
.logo-img {
  width: 40px; height: 40px;
  border-radius: 10px;
  object-fit: cover;
  position: relative;
  z-index: 1;
  box-shadow: 0 2px 12px rgba(229,57,53,0.4);
}
.logo-text {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 2px;
  position: relative;
  z-index: 1;
}
.logo-sub {
  font-size: 22px;
  color: var(--accent-blue);
  letter-spacing: 2.5px;
  font-weight: 800;
  opacity: 0.95;
  position: relative;
  z-index: 1;
}
.nav-menu {
  display: flex;
  gap: 14px;
  align-items: center;
}
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
  white-space: nowrap;
  padding: 8px 20px;
  border-radius: 8px;
}
.nav-link::before {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent-blue));
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
  text-shadow: 0 0 12px rgba(255,255,255,0.3);
}
.nav-link:hover::before {
  transform: translateX(-50%) scaleX(1);
}
.nav-link.active {
  color: var(--primary-light);
  background: rgba(229,57,53,0.12);
  text-shadow: 0 0 10px rgba(229,57,53,0.5);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 24px; height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--primary), 0 0 20px rgba(229,57,53,0.4);
}
/* ===== 顶部产品入口（主次分明，无循环动画，仅 hover 反馈）===== */
/* AI研选系统：红色实心主按钮 */
.nav-link-special {
  background: var(--gradient-primary) !important;
  color: #fff !important;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  border-radius: 999px;
  box-shadow: 0 4px 14px rgba(229,57,53,0.28);
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
}
.nav-link-special:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
  box-shadow: 0 8px 22px rgba(229,57,53,0.42);
}
.special-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #fff;
}

/* 英乐学：蓝色描边幽灵次按钮 */
.nav-link-english {
  background: rgba(0,170,220,0.08) !important;
  color: #4dd8f5 !important;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(77,216,245,0.5);
  box-shadow: none;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}
.nav-link-english:hover {
  transform: translateY(-1px);
  background: rgba(0,170,220,0.18) !important;
  border-color: rgba(77,216,245,0.85);
  color: #7ee6fb !important;
}
.english-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #4dd8f5;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 26px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero - 大图轮播 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 140px 24px 100px;
  overflow: hidden;
}
.hero-carousel {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transform: scale(1) translate(0, 0);
  transition: opacity 1.8s ease, transform 9s cubic-bezier(0.25, 0.1, 0.25, 1);
}
.hero-slide.active {
  opacity: 1;
  transform: scale(1.12) translate(-1.5%, -1%);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(6,9,18,0.7) 0%,
    rgba(10,14,26,0.5) 40%,
    rgba(10,14,26,0.85) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 960px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  background: rgba(229, 57, 53, 0.15);
  border: 1px solid rgba(229, 57, 53, 0.4);
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary-light);
  margin-bottom: 36px;
  backdrop-filter: blur(10px);
  animation: fadeInUp 0.8s ease;
  box-shadow: 0 0 30px rgba(229,57,53,0.15);
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary-light);
  animation: pulse 2s infinite;
  box-shadow: 0 0 10px var(--primary-light);
}
.hero-title {
  font-size: clamp(42px, 7vw, 76px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 28px;
  letter-spacing: -1px;
  animation: fadeInUp 0.8s ease 0.1s both;
  text-shadow: 0 4px 30px rgba(0,0,0,0.5);
}
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% auto;
  animation: gradientShift 5s ease infinite;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 19px);
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 48px;
  line-height: 1.9;
  animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 72px;
  animation: fadeInUp 0.8s ease 0.3s both;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 36px;
  border-radius: 100px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}
.btn-icon { font-size: 18px; }
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 6px 24px rgba(229,57,53,0.4);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 36px rgba(229,57,53,0.55);
}
.btn-outline {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
}
.btn-outline:hover {
  border-color: var(--accent-blue);
  background: rgba(0,212,255,0.08);
  box-shadow: 0 0 24px rgba(0,212,255,0.2);
  transform: translateY(-3px);
}
.btn-full { width: 100%; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
  animation: fadeInUp 0.8s ease 0.4s both;
}
.stat-item {
  text-align: center;
  padding: 24px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.stat-item:hover {
  border-color: rgba(229,57,53,0.5);
  transform: translateY(-6px) scale(1.05);
  background: rgba(229,57,53,0.1);
  box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 40px rgba(229,57,53,0.2);
}
.stat-number {
  font-size: 34px;
  font-weight: 900;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}
/* 轮播指示器 */
.carousel-dots {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}
.dot {
  width: 36px; height: 4px;
  border-radius: 2px;
  background: rgba(255,255,255,0.25);
  cursor: pointer;
  transition: var(--transition);
}
.dot.active {
  background: var(--gradient-primary);
  width: 48px;
  box-shadow: 0 0 12px var(--primary);
}
.scroll-indicator {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  z-index: 2;
}
.scroll-indicator span {
  width: 4px; height: 8px;
  background: var(--primary-light);
  border-radius: 2px;
  animation: scrollDown 1.5s infinite;
  box-shadow: 0 0 8px var(--primary);
}

/* ===== 通用 Section ===== */
.section { padding: 110px 0; position: relative; }
.section-dark { background: var(--bg-darker); }
.section-header { text-align: center; margin-bottom: 72px; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--primary-light);
  margin-bottom: 18px;
  text-shadow: 0 0 20px rgba(229,57,53,0.3);
}
.section-title {
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 800;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}
.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ===== 核心优势 ===== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.advantage-card {
  padding: 36px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.advantage-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}
.advantage-card::after {
  content: '';
  position: absolute;
  top: -50%; right: -50%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}
.advantage-card:hover {
  border-color: rgba(229,57,53,0.6);
  transform: translateY(-8px) scale(1.025);
  box-shadow: 0 25px 60px rgba(0,0,0,0.6), 0 0 50px rgba(229,57,53,0.25), inset 0 1px 0 rgba(255,255,255,0.1);
}
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-card:hover::after { opacity: 1; }
.adv-icon {
  width: 60px; height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(229,57,53,0.15), rgba(0,212,255,0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary-light);
  transition: var(--transition);
}
.advantage-card:hover .adv-icon {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 0 24px rgba(229,57,53,0.3);
}
.adv-icon svg { width: 30px; height: 30px; }
.advantage-card h3 {
  font-size: 21px;
  font-weight: 700;
  margin-bottom: 14px;
}
.advantage-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.85;
}

/* ===== 业务服务 ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.service-card {
  padding: 44px 32px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card:hover {
  transform: translateY(-8px) scale(1.025);
  border-color: rgba(229,57,53,0.6);
  box-shadow: 0 25px 60px rgba(0,0,0,0.6), 0 0 50px rgba(229,57,53,0.25), inset 0 1px 0 rgba(255,255,255,0.1);
}

/* 核心业务卡片特效 - AI研选模型（红色系） */
.service-card-1 {
  border-color: rgba(229,57,53,0.4);
  animation: cardGlowRed 3s ease-in-out infinite;
}
.service-card-1::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #e53935, #ff6b6b, #e53935, transparent);
  background-size: 200% 100%;
  animation: lightBarMove 3s linear infinite;
}
.service-card-1::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 50%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(229,57,53,0.06), transparent);
  animation: cardShineMove 4s ease-in-out infinite;
}
@keyframes cardGlowRed {
  0%, 100% {
    border-color: rgba(229,57,53,0.3);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 20px rgba(229,57,53,0.1);
  }
  50% {
    border-color: rgba(229,57,53,0.7);
    box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 50px rgba(229,57,53,0.25), 0 0 80px rgba(229,57,53,0.1);
  }
}

/* 核心业务卡片特效 - AI英语教育（蓝色系） */
.service-card-4 {
  border-color: rgba(0,212,255,0.4);
  animation: cardGlowBlue 3s ease-in-out infinite;
}
.service-card-4::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #00d4ff, #67e8f9, #00d4ff, transparent);
  background-size: 200% 100%;
  animation: lightBarMove 3s linear infinite;
}
.service-card-4::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 50%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.06), transparent);
  animation: cardShineMove 4s ease-in-out infinite;
}
@keyframes cardGlowBlue {
  0%, 100% {
    border-color: rgba(0,212,255,0.3);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 20px rgba(0,212,255,0.1);
  }
  50% {
    border-color: rgba(0,212,255,0.7);
    box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 50px rgba(0,212,255,0.25), 0 0 80px rgba(0,212,255,0.1);
  }
}
@keyframes lightBarMove {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes cardShineMove {
  0% { left: -100%; }
  50%, 100% { left: 150%; }
}
.service-number {
  position: absolute;
  top: 20px; right: 28px;
  font-size: 56px;
  font-weight: 900;
  color: rgba(229, 57, 53, 0.08);
  line-height: 1;
}
.service-icon {
  width: 68px; height: 68px;
  border-radius: 18px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 26px;
  color: white;
  box-shadow: 0 6px 24px rgba(229,57,53,0.35);
  transition: var(--transition);
}
.service-card:hover .service-icon {
  transform: scale(1.08);
  box-shadow: 0 8px 32px rgba(229,57,53,0.5);
}
.service-icon svg { width: 34px; height: 34px; }
.service-icon-img { background: transparent; box-shadow: none; }
.service-icon-img img { width: 100%; height: 100%; border-radius: 18px; object-fit: cover; }
.service-card:hover .service-icon-img { box-shadow: 0 8px 28px rgba(0,0,0,0.32); }
.service-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 18px;
}
.service-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 24px;
}
.service-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}
.service-features li {
  font-size: 14px;
  color: var(--text-secondary);
  padding-left: 22px;
  position: relative;
}
.service-features li::before {
  content: '';
  position: absolute;
  left: 0; top: 8px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}
.service-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-light);
  transition: var(--transition);
}
.service-link:hover {
  color: var(--accent-blue);
  transform: translateX(4px);
}

/* ===== 模型演进 ===== */
.timeline {
  position: relative;
  max-width: 820px;
  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-blue), var(--border));
}
.timeline-item {
  position: relative;
  margin-bottom: 52px;
  padding-left: 32px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -34px; top: 4px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--text-muted);
  transition: var(--transition);
  z-index: 2;
}
.timeline-item-active .timeline-dot {
  border-color: var(--primary);
  background: var(--primary);
  box-shadow: 0 0 24px var(--primary-glow);
  animation: dotPulse 2s ease-in-out infinite;
}
.timeline-item-active .timeline-dot::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--primary);
  animation: dotRipple 2s ease-out infinite;
  z-index: -1;
}
.timeline-item-active .timeline-dot::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--primary);
  animation: dotRipple 2s ease-out infinite 1s;
  z-index: -1;
}
@keyframes dotPulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(229,57,53,0.5);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 40px rgba(229,57,53,0.9), 0 0 60px rgba(229,57,53,0.4);
    transform: scale(1.2);
  }
}
@keyframes dotRipple {
  0% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.6;
  }
  100% {
    transform: translate(-50%, -50%) scale(3.5);
    opacity: 0;
  }
}
.timeline-content {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.timeline-item-active .timeline-content {
  border-color: var(--primary);
  box-shadow: 0 0 30px rgba(229,57,53,0.2), 0 10px 40px rgba(0,0,0,0.4);
  animation: cardGlow 2.5s ease-in-out infinite;
}
.timeline-item-active .timeline-content::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(229,57,53,0.08), transparent);
  animation: cardShine 3s ease-in-out infinite;
}
@keyframes cardGlow {
  0%, 100% {
    border-color: rgba(229,57,53,0.5);
    box-shadow: 0 0 20px rgba(229,57,53,0.15), 0 10px 40px rgba(0,0,0,0.4);
  }
  50% {
    border-color: rgba(229,57,53,0.9);
    box-shadow: 0 0 45px rgba(229,57,53,0.35), 0 10px 50px rgba(0,0,0,0.5), 0 0 80px rgba(229,57,53,0.15);
  }
}
@keyframes cardShine {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}
.timeline-version {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(229, 57, 53, 0.12);
  color: var(--primary-light);
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 14px;
}
.timeline-content h3 {
  font-size: 21px;
  font-weight: 700;
  margin-bottom: 10px;
}
.timeline-content p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.85;
}

/* ===== 成长方向 ===== */
.growth-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.growth-card {
  padding: 34px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.growth-card:hover {
  border-color: rgba(0,212,255,0.5);
  transform: translateY(-8px) scale(1.025);
  box-shadow: 0 25px 60px rgba(0,0,0,0.6), 0 0 50px rgba(0,212,255,0.2), inset 0 1px 0 rgba(255,255,255,0.1);
}
.growth-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 18px;
}
.growth-index {
  font-size: 36px;
  font-weight: 900;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}
.growth-header h3 {
  font-size: 21px;
  font-weight: 700;
}
.growth-card > p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 22px;
}
.growth-space {
  padding: 14px 18px;
  background: rgba(245, 158, 11, 0.08);
  border-left: 3px solid var(--accent-gold);
  border-radius: 0 10px 10px 0;
  font-size: 13.5px;
  color: var(--accent-gold);
  font-weight: 500;
}

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: stretch;
}
.about-content .section-tag { margin-bottom: 24px; }
.about-content .section-title {
  text-align: left;
  margin-bottom: 40px;
}
.about-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 2.15;
  margin-bottom: 28px;
}
.about-values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 56px;
}
.value-item {
  padding: 34px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.value-item:hover {
  border-color: rgba(229,57,53,0.5);
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 40px rgba(229,57,53,0.2);
}
.value-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--primary-light);
}
.value-item p {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 两大核心业务展示（左侧） ===== */
.about-business {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 8px;
  margin-bottom: 8px;
}
.about-business-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.025);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.about-business-item::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 3px;
  opacity: 0.8;
}
.about-business-icon {
  width: 40px; height: 40px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.35s ease;
}
.about-business-icon svg {
  width: 21px; height: 21px;
}
.about-business-icon-img { background: transparent; box-shadow: none; }
.about-business-icon-img img { width: 100%; height: 100%; border-radius: 11px; object-fit: cover; }
.about-business-info {
  flex: 1;
  text-align: left;
  min-width: 0;
}
.about-business-info h4 {
  font-size: 14.5px;
  font-weight: 700;
  margin-bottom: 3px;
  letter-spacing: 0.3px;
}
.about-business-info p {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}
.about-business-red::before {
  background: linear-gradient(180deg, var(--primary), var(--primary-light));
  box-shadow: 0 0 10px rgba(229,57,53,0.5);
}
.about-business-red .about-business-icon {
  background: linear-gradient(135deg, rgba(229,57,53,0.22), rgba(229,57,53,0.08));
  color: var(--primary-light);
  box-shadow: 0 4px 14px rgba(229,57,53,0.18);
}
.about-business-red h4 { color: var(--primary-light); }
.about-business-red:hover {
  border-color: rgba(229,57,53,0.4);
  background: rgba(229,57,53,0.05);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 20px rgba(229,57,53,0.1);
  transform: translateY(-3px);
}
.about-business-red:hover .about-business-icon {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(229,57,53,0.35);
}
.about-business-blue::before {
  background: linear-gradient(180deg, var(--accent-blue), #5ee7ff);
  box-shadow: 0 0 10px rgba(0,212,255,0.5);
}
.about-business-blue .about-business-icon {
  background: linear-gradient(135deg, rgba(0,212,255,0.22), rgba(0,212,255,0.08));
  color: var(--accent-blue);
  box-shadow: 0 4px 14px rgba(0,212,255,0.18);
}
.about-business-blue h4 { color: var(--accent-blue); }
.about-business-blue:hover {
  border-color: rgba(0,212,255,0.4);
  background: rgba(0,212,255,0.05);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 20px rgba(0,212,255,0.1);
  transform: translateY(-3px);
}
.about-business-blue:hover .about-business-icon {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(0,212,255,0.35);
}

/* ===== 右侧品牌卡片增强样式 ===== */
.about-card-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  border-radius: 24px;
  pointer-events: none;
  opacity: 0.6;
}
.about-card-corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border-color: rgba(0,212,255,0.35);
  border-style: solid;
  pointer-events: none;
  z-index: 2;
}
.about-card-corner-tl { top: 12px; left: 12px; border-width: 2px 0 0 2px; border-radius: 6px 0 0 0; }
.about-card-corner-tr { top: 12px; right: 12px; border-width: 2px 2px 0 0; border-radius: 0 6px 0 0; }
.about-card-corner-bl { bottom: 12px; left: 12px; border-width: 0 0 2px 2px; border-radius: 0 0 0 6px; }
.about-card-corner-br { bottom: 12px; right: 12px; border-width: 0 2px 2px 0; border-radius: 0 0 6px 0; }
.about-card-float {
  position: absolute;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: rgba(15,23,42,0.85);
  border: 1px solid rgba(0,212,255,0.25);
  color: var(--accent-blue);
  opacity: 0;
  pointer-events: none;
  z-index: 3;
}
.about-card-float svg { width: 16px; height: 16px; }
.about-card-float-1 { top: -8px; right: 10%; animation: floatOrbit1 6s ease-in-out infinite; }
.about-card-float-2 { bottom: 10%; left: -12px; animation: floatOrbit2 7s ease-in-out infinite; }
.about-card-float-3 { top: 20%; right: -14px; animation: floatOrbit3 5.5s ease-in-out infinite; }
@keyframes floatOrbit1 {
  0%, 100% { opacity: 0; transform: translate(0, 0) scale(0.8); }
  20% { opacity: 0.9; transform: translate(-6px, 8px) scale(1); }
  50% { opacity: 0.7; transform: translate(-14px, 16px) scale(0.95); }
  80% { opacity: 0.9; transform: translate(-6px, 24px) scale(1); }
}
@keyframes floatOrbit2 {
  0%, 100% { opacity: 0; transform: translate(0, 0) scale(0.8); }
  25% { opacity: 0.9; transform: translate(10px, -6px) scale(1); }
  55% { opacity: 0.7; transform: translate(18px, -14px) scale(0.95); }
  85% { opacity: 0.9; transform: translate(10px, -22px) scale(1); }
}
@keyframes floatOrbit3 {
  0%, 100% { opacity: 0; transform: translate(0, 0) scale(0.8); }
  30% { opacity: 0.9; transform: translate(-8px, 10px) scale(1); }
  60% { opacity: 0.7; transform: translate(-16px, 6px) scale(0.95); }
}
.about-card-stat {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.about-card-stat-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(229,57,53,0.15), rgba(0,212,255,0.1));
  color: var(--primary-light);
  margin-bottom: 2px;
}
.about-card-stat-icon svg { width: 15px; height: 15px; }
.about-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.about-tag-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent-blue));
  box-shadow: 0 0 6px rgba(0,212,255,0.5);
  flex-shrink: 0;
}
.about-card-footer {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
}
.about-card-footer span {
  font-size: 11.5px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  opacity: 0.8;
}

.about-visual { display: flex; justify-content: center; height: 100%; }
.about-card {
  width: 100%;
  padding: 40px 36px 32px;
  background: linear-gradient(145deg, rgba(20,26,40,0.95), rgba(12,16,28,0.98));
  border: none;
  border-radius: 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
  animation: aboutCardGlow 4s ease-in-out infinite;
}
.about-card:hover {
  transform: translateY(-6px) scale(1.015);
  border-color: rgba(229,57,53,0.6);
  box-shadow: 0 30px 70px rgba(0,0,0,0.6), 0 0 80px rgba(229,57,53,0.2);
}
@keyframes aboutCardGlow {
  0%, 100% {
    border-color: rgba(229,57,53,0.2);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3), 0 0 30px rgba(229,57,53,0.08);
  }
  50% {
    border-color: rgba(229,57,53,0.45);
    box-shadow: 0 15px 50px rgba(0,0,0,0.4), 0 0 60px rgba(229,57,53,0.15);
  }
}

/* 背景旋转光环 - 已隐藏 */
.about-card-bg-ring {
  display: none;
}
.about-card-bg-ring-2 {
  width: 450px; height: 450px;
  animation: bgRingRotate 15s linear infinite reverse;
  opacity: 0.6;
}
@keyframes bgRingRotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* 顶部品牌标签 */
.about-card-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
}
.about-card-badge {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent-blue);
  padding: 5px 12px;
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 100px;
  background: rgba(0,212,255,0.06);
}
.about-card-badge-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--primary);
  animation: dotBlink 1.5s ease-in-out infinite;
}
.about-card-badge-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* Logo区域 */
.about-card-icon-wrap {
  position: relative;
  z-index: 2;
  width: 130px; height: 130px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-card-icon-ring {
  position: absolute;
  top: 50%; left: 50%;
  width: 130px; height: 130px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 2px dashed rgba(229,57,53,0.3);
  animation: iconRingRotate 8s linear infinite;
}
.about-card-icon-ring-2 {
  width: 155px; height: 155px;
  border: 1px dashed rgba(0,212,255,0.25);
  animation: iconRingRotate 12s linear infinite reverse;
}
@keyframes iconRingRotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}
.about-card-icon {
  position: relative;
  width: 100px; height: 100px;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(229,57,53,0.4), 0 0 30px rgba(229,57,53,0.2);
  animation: iconPulse 3s ease-in-out infinite;
}
@keyframes iconPulse {
  0%, 100% { box-shadow: 0 10px 40px rgba(229,57,53,0.35), 0 0 20px rgba(229,57,53,0.15); }
  50% { box-shadow: 0 10px 50px rgba(229,57,53,0.55), 0 0 40px rgba(229,57,53,0.3); }
}
.about-card-icon img { width: 100%; height: 100%; object-fit: cover; }

/* 公司名称 */
.about-card-title {
  position: relative;
  z-index: 2;
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 6px;
  background: linear-gradient(135deg, #ffffff 0%, #e0e0e0 50%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}
.about-card-subtitle {
  position: relative;
  z-index: 2;
  font-size: 13px;
  color: var(--accent-blue);
  letter-spacing: 4px;
  margin-bottom: 20px;
  font-weight: 600;
  text-transform: uppercase;
}

/* 分隔线 */
.about-card-line {
  position: relative;
  z-index: 2;
  width: 100px; height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), var(--accent-blue), transparent);
  margin: 0 auto 20px;
  border-radius: 2px;
  overflow: visible;
}
.about-card-line-dot {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px var(--primary), 0 0 20px rgba(229,57,53,0.5);
  animation: lineDotPulse 2s ease-in-out infinite;
}
@keyframes lineDotPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.4); opacity: 0.7; }
}

/* Slogan */
.about-card-slogan {
  position: relative;
  z-index: 2;
  font-size: 16px !important;
  color: var(--text-secondary) !important;
  font-style: italic;
  letter-spacing: 1px !important;
  margin-bottom: 24px;
  line-height: 1.6;
}

/* 核心数据 */
.about-card-stats {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 24px;
  padding: 16px 12px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
}
.about-card-stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.about-card-stat-num {
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.about-card-stat-label {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.about-card-stat-divider {
  width: 1px;
  height: 32px;
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.15), transparent);
}

/* 两大产品入口 - 科技感卡片式 */
.about-card-products {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 0;
}
.product-entry {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 14px;
  text-decoration: none;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
}
.product-entry::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  transition: left 0.6s ease;
}
.product-entry:hover::before {
  left: 120%;
}
.product-entry:hover {
  transform: translateX(4px) scale(1.01);
}
.product-entry-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.product-entry-icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.35s ease;
}
.product-entry-icon svg {
  width: 22px; height: 22px;
}
.product-entry-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 3px 8px;
  border-radius: 100px;
  text-transform: uppercase;
}
.product-entry-body {
  flex: 1;
  min-width: 0;
}
.product-entry-name {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 2px;
  line-height: 1.3;
}
.product-entry-desc {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.product-entry-arrow {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.35s ease;
  opacity: 0.5;
}
.product-entry-arrow svg {
  width: 16px; height: 16px;
}
.product-entry:hover .product-entry-arrow {
  opacity: 1;
  transform: translateX(3px);
}
.product-entry-glow {
  position: absolute;
  top: 50%; right: -20px;
  width: 80px; height: 80px;
  transform: translateY(-50%);
  border-radius: 50%;
  filter: blur(30px);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}
.product-entry:hover .product-entry-glow {
  opacity: 0.5;
}

/* 红色主题 - AI研选系统 */
.product-entry-red {
  color: var(--primary-light);
}
.product-entry-red .product-entry-icon {
  background: linear-gradient(135deg, rgba(229,57,53,0.2), rgba(229,57,53,0.08));
  color: var(--primary-light);
  box-shadow: 0 4px 16px rgba(229,57,53,0.2);
}
.product-entry-red .product-entry-tag {
  background: rgba(229,57,53,0.12);
  color: var(--primary-light);
  border: 1px solid rgba(229,57,53,0.25);
}
.product-entry-red:hover {
  border-color: rgba(229,57,53,0.5);
  background: rgba(229,57,53,0.06);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 30px rgba(229,57,53,0.15);
}
.product-entry-red:hover .product-entry-icon {
  background: linear-gradient(135deg, rgba(229,57,53,0.35), rgba(229,57,53,0.15));
  box-shadow: 0 6px 24px rgba(229,57,53,0.4);
  transform: scale(1.08);
}
.product-entry-red .product-entry-arrow {
  background: rgba(229,57,53,0.15);
  color: var(--primary-light);
}
.product-entry-red .product-entry-glow {
  background: rgba(229,57,53,0.4);
}

/* 蓝色主题 - 英乐学AI教育 */
.product-entry-blue {
  color: var(--accent-blue);
}
.product-entry-blue .product-entry-icon {
  background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(0,212,255,0.08));
  color: var(--accent-blue);
  box-shadow: 0 4px 16px rgba(0,212,255,0.2);
}
.product-entry-blue .product-entry-tag {
  background: rgba(0,212,255,0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(0,212,255,0.25);
}
.product-entry-blue:hover {
  border-color: rgba(0,212,255,0.5);
  background: rgba(0,212,255,0.06);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 30px rgba(0,212,255,0.15);
}
.product-entry-blue:hover .product-entry-icon {
  background: linear-gradient(135deg, rgba(0,212,255,0.35), rgba(0,212,255,0.15));
  box-shadow: 0 6px 24px rgba(0,212,255,0.4);
  transform: scale(1.08);
}
.product-entry-blue .product-entry-arrow {
  background: rgba(0,212,255,0.15);
  color: var(--accent-blue);
}
.product-entry-blue .product-entry-glow {
  background: rgba(0,212,255,0.4);
}

/* ===== 两大核心领域展示 ===== */
.about-domains {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
  width: 100%;
}
.about-domain {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.025);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.about-domain::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 3px;
  opacity: 0.8;
}
.about-domain-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.35s ease;
}
.about-domain-icon svg {
  width: 23px; height: 23px;
}
.about-domain-info {
  flex: 1;
  text-align: left;
  min-width: 0;
}
.about-domain-info h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 3px;
  letter-spacing: 0.5px;
}
.about-domain-info p {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.about-domain-red::before {
  background: linear-gradient(180deg, var(--primary), var(--primary-light));
  box-shadow: 0 0 12px rgba(229,57,53,0.6);
}
.about-domain-red .about-domain-icon {
  background: linear-gradient(135deg, rgba(229,57,53,0.22), rgba(229,57,53,0.08));
  color: var(--primary-light);
  box-shadow: 0 4px 16px rgba(229,57,53,0.2);
}
.about-domain-red h4 { color: var(--primary-light); }
.about-domain-red:hover {
  border-color: rgba(229,57,53,0.45);
  background: rgba(229,57,53,0.06);
  box-shadow: 0 8px 28px rgba(0,0,0,0.3), 0 0 24px rgba(229,57,53,0.12);
  transform: translateX(3px);
}
.about-domain-red:hover .about-domain-icon {
  transform: scale(1.08);
  box-shadow: 0 6px 22px rgba(229,57,53,0.4);
}
.about-domain-blue::before {
  background: linear-gradient(180deg, var(--accent-blue), #5ee7ff);
  box-shadow: 0 0 12px rgba(0,212,255,0.6);
}
.about-domain-blue .about-domain-icon {
  background: linear-gradient(135deg, rgba(0,212,255,0.22), rgba(0,212,255,0.08));
  color: var(--accent-blue);
  box-shadow: 0 4px 16px rgba(0,212,255,0.2);
}
.about-domain-blue h4 { color: var(--accent-blue); }
.about-domain-blue:hover {
  border-color: rgba(0,212,255,0.45);
  background: rgba(0,212,255,0.06);
  box-shadow: 0 8px 28px rgba(0,0,0,0.3), 0 0 24px rgba(0,212,255,0.12);
  transform: translateX(3px);
}
.about-domain-blue:hover .about-domain-icon {
  transform: scale(1.08);
  box-shadow: 0 6px 22px rgba(0,212,255,0.4);
}

/* ===== 技术能力标签 ===== */
.about-tags {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 18px;
  width: 100%;
}
.about-tag {
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.3px;
  padding: 6px 13px;
  border-radius: 100px;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  transition: all 0.3s ease;
  cursor: default;
}
.about-tag:hover {
  color: #fff;
  border-color: rgba(0,212,255,0.4);
  background: rgba(0,212,255,0.08);
  box-shadow: 0 0 14px rgba(0,212,255,0.15);
  transform: translateY(-2px);
}
.about-tag:nth-child(odd):hover {
  border-color: rgba(229,57,53,0.4);
  background: rgba(229,57,53,0.08);
  box-shadow: 0 0 14px rgba(229,57,53,0.15);
}

/* 底部官网 */
.about-card-footer {
  position: relative;
  z-index: 2;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.about-card-footer-text {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1px;
  font-family: 'Courier New', monospace;
}

/* 四角科技装饰 */
.about-card-corner {
  display: none;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 48px;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-item {
  display: flex;
  gap: 18px;
  padding: 26px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.contact-item:hover {
  border-color: rgba(229,57,53,0.5);
  transform: translateX(8px) scale(1.02);
  box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 40px rgba(229,57,53,0.15);
}
.contact-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(229,57,53,0.15), rgba(0,212,255,0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-light);
  flex-shrink: 0;
}
.contact-icon svg { width: 26px; height: 26px; }
.contact-item h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}
.contact-item p {
  font-size: 15px;
  color: var(--text-secondary);
}
.contact-form {
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.form-group { margin-bottom: 18px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 15px 20px;
  background: var(--bg-darker);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(229,57,53,0.1);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 20px center;
  padding-right: 48px;
}
.form-group textarea { resize: vertical; min-height: 110px; }

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border);
  padding: 72px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 52px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.footer-logo img { width: 36px; height: 36px; border-radius: 9px; }
.footer-logo span { font-size: 19px; font-weight: 700; }
.footer-brand > p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 8px;
}
.footer-brand-en {
  font-size: 11px !important;
  color: var(--accent-blue) !important;
  letter-spacing: 2px;
  font-weight: 600;
}
.footer-links h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 18px;
  color: var(--text-primary);
}
.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links a {
  font-size: 14px;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}
.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-beian {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.beian-link {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.beian-link:hover {
  color: var(--primary-light);
  text-shadow: 0 0 8px rgba(229,57,53,0.4);
}
.beian-police:hover {
  color: var(--accent-blue);
  text-shadow: 0 0 8px rgba(0,212,255,0.4);
}
.police-badge-icon {
  width: 16px;
  height: 16px;
  object-fit: contain;
  vertical-align: middle;
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: 0 6px 24px rgba(229,57,53,0.4);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 36px rgba(229,57,53,0.55);
}
.back-to-top svg { width: 22px; height: 22px; }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}
@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}
@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
/* 平板/小桌面横屏紧凑区间：避免 8 个菜单项挤压折行错位 */
@media (min-width: 992px) and (max-width: 1200px) {
  .nav-container { padding: 0 20px; }
  .nav-logo { gap: 9px; }
  .logo-text { font-size: 19px; letter-spacing: 1px; }
  .logo-sub { font-size: 17px; letter-spacing: 1.5px; }
  .nav-menu { gap: 6px; }
  .nav-link { padding: 7px 11px; font-size: 14px; }
}
/* 991px 及以下折叠为汉堡下拉菜单（含平板横屏/竖屏） */
@media (max-width: 991px) {
  .nav-menu {
    position: fixed;
    top: 70px; left: 0; right: 0;
    background: rgba(6, 9, 18, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-150%);
    transition: transform 0.35s ease;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }
  .nav-menu.active { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .nav-link { padding: 12px 16px; font-size: 16px; }
}
@media (max-width: 1024px) {
  .advantages-grid, .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .logo-sub { display: none; }
}
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px; left: 0; right: 0;
    background: rgba(6, 9, 18, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-150%);
    transition: transform 0.35s ease;
  }
  .nav-menu.active { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .nav-link { padding: 12px 16px; font-size: 16px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid, .services-grid, .growth-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .about-values { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 72px 0; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 300px; }
  .carousel-dots { bottom: 100px; }
}
@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr; }
  .stat-number { font-size: 28px; }
  .hero-title { font-size: 36px; }
}