/* ========================================
   众悟知行 官网样式
   ======================================== */

/* CSS Variables */
:root {
  --primary: #c41e3a;
  --primary-dark: #a01830;
  --primary-light: #e8354f;
  --accent: #d4af37;
  --accent-light: #f0d77a;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #888;
  --bg-primary: #fff;
  --bg-secondary: #fafafa;
  --bg-dark: #1a1a1a;
  --border-color: #e5e5e5;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-display: 'Noto Serif SC', Georgia, serif;
  --font-body: Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
ul { list-style: none; margin: 0; padding: 0; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Background Decoration */
.bg-decoration {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}
.bg-circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.bg-circle-1 {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, rgba(196,30,58,0.15), rgba(212,175,55,0.1));
  top: -200px;
  right: -100px;
  animation: float 20s ease-in-out infinite;
}
.bg-circle-2 {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, rgba(212,175,55,0.12), rgba(196,30,58,0.08));
  bottom: 20%;
  left: -100px;
  animation: float 25s ease-in-out infinite reverse;
}
.bg-circle-3 {
  width: 300px;
  height: 300px;
  background: rgba(196,30,58,0.08);
  top: 50%;
  right: 10%;
  animation: float 18s ease-in-out infinite 5s;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, 20px); }
}

/* ========================================
   Header
   ======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo {
  width: 36px;
  height: 36px;
  border-radius: 6px;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 1px;
}
.nav {
  display: flex;
  gap: 32px;
}
.nav a {
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}
.nav a:hover {
  color: var(--primary);
}
.nav a:hover::after {
  width: 100%;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding: 80px 0 100px;
  min-height: 90vh;
  display: flex;
  align-items: center;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: linear-gradient(135deg, rgba(196,30,58,0.1), rgba(212,175,55,0.1));
  border: 1px solid rgba(196,30,58,0.2);
  border-radius: 50px;
  font-size: 14px;
  color: var(--primary);
  margin-bottom: 20px;
}
.hero-text h1 {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 12px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--accent);
  margin: 0 0 20px;
  font-weight: 600;
}
.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin: 0 0 32px;
  max-width: 480px;
  line-height: 1.8;
}
.cta {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
  border: 2px solid transparent;
}
.btn.primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(196,30,58,0.3);
}
.btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(196,30,58,0.4);
}
.btn.ghost {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-color);
}
.btn.ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.btn svg {
  flex-shrink: 0;
}

.hero-stats {
  display: flex;
  gap: 40px;
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}
.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* Hero Media */
.hero-media {
  display: flex;
  justify-content: center;
}
.phone-frame {
  position: relative;
  background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
  border-radius: 40px;
  padding: 12px;
  box-shadow: var(--shadow-lg), inset 0 1px 1px rgba(255,255,255,0.1);
}
.phone-frame::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 24px;
  background: #1a1a1a;
  border-radius: 12px;
  z-index: 10;
}
.hero .carousel {
  width: 280px;
  aspect-ratio: 9/19.5;
  border-radius: 28px;
  overflow: hidden;
  background: #fff;
}

/* ========================================
   Carousel
   ======================================== */
.carousel {
  position: relative;
  overflow: hidden;
}
.carousel-track {
  display: flex;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  touch-action: pan-y;
}
.carousel-slide {
  min-width: 100%;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  cursor: pointer;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.carousel-btn:hover {
  background: #fff;
  box-shadow: var(--shadow-md);
}
.carousel-btn.prev { left: 8px; }
.carousel-btn.next { right: 8px; }
.carousel-btn svg {
  stroke: var(--text-primary);
}
.carousel-dots {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px);
  border-radius: 20px;
}
.carousel-dots button {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: none;
  background: #ccc;
  cursor: pointer;
  padding: 0;
  transition: var(--transition);
}
.carousel-dots button[aria-selected="true"] {
  background: var(--primary);
  width: 18px;
  border-radius: 3px;
}

/* ========================================
   Section Common
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, rgba(196,30,58,0.08), rgba(212,175,55,0.08));
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  margin: 0 0 16px;
}
.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  margin: 0;
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Features Section
   ======================================== */
.features {
  padding: 100px 0;
  background: var(--bg-secondary);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-card-large {
  grid-column: span 2;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 32px;
  align-items: center;
}
.feature-card-highlight {
  background: linear-gradient(135deg, rgba(196,30,58,0.03), rgba(212,175,55,0.03));
  border-color: rgba(196,30,58,0.2);
}
.feature-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(196,30,58,0.1), rgba(212,175,55,0.1));
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  flex-shrink: 0;
}
.feature-card-large .feature-icon {
  margin-bottom: 0;
}
.feature-icon svg {
  stroke: var(--primary);
}
.feature-content h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 12px;
}
.feature-content p {
  color: var(--text-secondary);
  margin: 0 0 16px;
  line-height: 1.7;
}
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text-secondary);
}
.feature-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--primary);
  color: #fff;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}
.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.feature-tags span {
  padding: 6px 12px;
  background: rgba(196,30,58,0.08);
  color: var(--primary);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
}
.feature-grid-inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}
.feature-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: rgba(196,30,58,0.04);
  border-radius: var(--radius-sm);
}
.feature-item strong {
  font-size: 15px;
  color: var(--text-primary);
}
.feature-item span {
  font-size: 13px;
  color: var(--text-muted);
}
.feature-image {
  width: 200px;
  flex-shrink: 0;
}
.feature-image img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* ========================================
   AI Workshop Section
   ======================================== */
.ai-workshop {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}
.ai-workshop-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.ai-workshop-content h2 {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  margin: 16px 0 8px;
}
.ai-subtitle {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--accent);
  margin: 0 0 16px;
}
.ai-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0 0 32px;
}
.ai-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.ai-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.ai-feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(196,30,58,0.1), rgba(212,175,55,0.08));
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.ai-feature-icon svg {
  stroke: var(--primary);
}
.ai-feature strong {
  display: block;
  font-size: 15px;
  margin-bottom: 2px;
}
.ai-feature span {
  font-size: 13px;
  color: var(--text-muted);
}
.ai-cta {
  gap: 10px;
}

/* AI Visual */
.ai-workshop-visual {
  display: flex;
  justify-content: center;
}
.ai-visual-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}
.ai-chat-demo {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.chat-bubble {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  max-width: 90%;
}
.chat-bubble.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}
.chat-bubble.user span {
  background: var(--primary);
  color: #fff;
  padding: 12px 16px;
  border-radius: 18px 18px 4px 18px;
}
.chat-bubble.ai span {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: 18px 18px 18px 4px;
  font-size: 14px;
  line-height: 1.6;
}
.ai-avatar {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}
.typing-dots {
  display: flex;
  gap: 4px;
  padding: 8px 0;
}
.typing-dots i {
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}
.typing-dots i:nth-child(2) { animation-delay: 0.2s; }
.typing-dots i:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

/* ========================================
   Download Section
   ======================================== */
.download {
  padding: 100px 0;
  background: var(--bg-primary);
}
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}
.download-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.download-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.download-card:hover .download-arrow {
  transform: translateX(4px);
}
.download-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}
.download-icon svg {
  fill: var(--primary);
}
.download-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.download-platform {
  font-weight: 700;
  font-size: 18px;
}
.download-desc {
  font-size: 14px;
  color: var(--text-muted);
}
.download-arrow {
  stroke: var(--text-muted);
  transition: var(--transition);
  flex-shrink: 0;
}
.download-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 14px;
}
.download-hint svg {
  stroke: var(--text-muted);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  padding: 100px 0;
  background: var(--bg-secondary);
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: center;
}
.contact-info h2 {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  margin: 0 0 12px;
}
.contact-info > p {
  color: var(--text-secondary);
  font-size: 17px;
  margin: 0 0 32px;
}
.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(196,30,58,0.1), rgba(212,175,55,0.08));
  border-radius: var(--radius-sm);
}
.contact-icon svg {
  stroke: var(--primary);
}
.contact-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-card a {
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}
.contact-card a:hover {
  color: var(--primary);
}
.contact-decoration {
  display: flex;
  align-items: center;
  justify-content: center;
}
.bagua-symbol {
  font-size: 120px;
  color: rgba(196,30,58,0.1);
  animation: rotate 30s linear infinite;
}
@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--bg-dark);
  color: #fff;
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}
.footer-logo {
  width: 28px;
  height: 28px;
  border-radius: 4px;
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  transition: var(--transition);
}
.footer-links a:hover {
  color: #fff;
}
.footer-legal {
  width: 100%;
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-legal p {
  margin: 0 0 8px;
  color: rgba(255,255,255,0.6);
  font-size: 14px;
}
.beian {
  font-size: 12px;
}
.beian a {
  color: rgba(255,255,255,0.5);
  transition: var(--transition);
}
.beian a:hover {
  color: rgba(255,255,255,0.8);
}
.beian .sep {
  margin: 0 12px;
  color: rgba(255,255,255,0.3);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }
  .hero-text h1 {
    font-size: 44px;
  }
  .hero-desc {
    max-width: 100%;
  }
  .cta {
    justify-content: center;
  }
  .hero-stats {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card-large {
    grid-column: span 1;
    grid-template-columns: 1fr;
    text-align: center;
  }
  .feature-card-large .feature-icon {
    margin: 0 auto 20px;
  }
  .feature-image {
    display: none;
  }
  .ai-workshop-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .ai-features {
    justify-content: center;
  }
  .ai-feature {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .contact-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .contact-decoration {
    display: none;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }
  .nav.is-open {
    display: flex;
  }
  .nav-toggle {
    display: flex;
  }
  .hero {
    padding: 48px 0 64px;
    min-height: auto;
  }
  .hero-text h1 {
    font-size: 36px;
  }
  .hero-subtitle {
    font-size: 22px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }
  .section-header h2 {
    font-size: 28px;
  }
  .features,
  .ai-workshop,
  .download,
  .contact {
    padding: 64px 0;
  }
  .feature-card {
    padding: 24px;
  }
  .feature-grid-inner {
    grid-template-columns: 1fr;
  }
  .ai-features {
    grid-template-columns: 1fr;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 28px;
  }
  .hero .carousel {
    width: 240px;
  }
  .cta {
    flex-direction: column;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}