:root {
  --gg-primary: #009688;
  --gg-primary-dark: #00796B;
  --gg-primary-light: #B2DFDB;
  --gg-secondary: #3D5C8A;
  --gg-secondary-dark: #2E4466;
  --gg-accent: #FF5722;
  --gg-bg: #F5F7FA;
  --gg-surface: #FFFFFF;
  --gg-text: #2C3E50;
  --gg-text-light: #7F8C8D;
  --gg-border: #E8ECF0;
  --gg-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --gg-shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--gg-bg);
  color: var(--gg-text);
  line-height: 1.6;
}

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

/* ==================== Hero Section ==================== */
.hero {
  padding: 40px 0 50px;
  text-align: center;
  background: linear-gradient(135deg, var(--gg-primary) 0%, var(--gg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 450px;
  height: 450px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.logo-wrapper {
  margin-bottom: 18px;
}

.logo-wrapper img {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.logo-wrapper img:hover {
  transform: scale(1.05);
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.hero .tagline {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 0;
  font-weight: 300;
}

.hero .subtitle {
  display: none;
}

/* ==================== CTA Section ==================== */
.cta-section {
  padding: -30px 0 40px;
  position: relative;
  z-index: 2;
}

.cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.cta-card {
  background: var(--gg-surface);
  border-radius: 16px;
  padding: 28px;
  box-shadow: var(--gg-shadow-lg);
  text-align: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid var(--gg-border);
}

.cta-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.cta-card-icon {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  transition: transform 0.3s ease;
}

.cta-card:hover .cta-card-icon {
  transform: scale(1.08);
}

.cta-card-icon.chat {
  background: linear-gradient(135deg, var(--gg-primary) 0%, #00BCD4 100%);
}

.cta-card-icon.manual {
  background: linear-gradient(135deg, var(--gg-secondary) 0%, #607D8B 100%);
}

.cta-card-icon svg {
  width: 30px;
  height: 30px;
  fill: #FFFFFF;
}

.cta-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gg-text);
}

.cta-card p {
  font-size: 14px;
  color: var(--gg-text-light);
  margin-bottom: 20px;
  line-height: 1.6;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.cta-btn-primary {
  background: linear-gradient(135deg, var(--gg-primary) 0%, var(--gg-primary-dark) 100%);
  color: #FFFFFF;
}

.cta-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 150, 136, 0.4);
}

.cta-btn-secondary {
  background: linear-gradient(135deg, var(--gg-secondary) 0%, var(--gg-secondary-dark) 100%);
  color: #FFFFFF;
}

.cta-btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(61, 92, 138, 0.4);
}

.cta-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ==================== Features Section ==================== */
.features {
  padding: 40px 0;
  background: var(--gg-surface);
}

.features h2 {
  font-size: 24px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 32px;
  color: var(--gg-text);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature-card {
  text-align: center;
  padding: 24px 16px;
  border-radius: 12px;
  background: var(--gg-bg);
  transition: all 0.3s ease;
}

.feature-card:hover {
  background: var(--gg-surface);
  box-shadow: var(--gg-shadow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}

.feature-icon.svg {
  background: linear-gradient(135deg, #E91E63 0%, #FF5722 100%);
}

.feature-icon.brain {
  background: linear-gradient(135deg, #9C27B0 0%, #673AB7 100%);
}

.feature-icon.pencil {
  background: linear-gradient(135deg, #FF9800 0%, #F44336 100%);
}

.feature-icon.export {
  background: linear-gradient(135deg, #4CAF50 0%, #2E7D32 100%);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  fill: #FFFFFF;
}

.feature-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gg-text);
}

.feature-card p {
  font-size: 13px;
  color: var(--gg-text-light);
  line-height: 1.5;
}

/* ==================== Footer ==================== */
.footer {
  padding: 24px 0;
  text-align: center;
  background: var(--gg-text);
  color: rgba(255, 255, 255, 0.6);
}

.footer p {
  font-size: 13px;
}

.footer-links {
  margin-top: 10px;
  display: flex;
  justify-content: center;
  gap: 16px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #FFFFFF;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .hero {
    padding: 30px 0 40px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero .tagline {
    font-size: 15px;
    margin-bottom: 0;
  }

  .logo-wrapper img {
    width: 65px;
    height: 65px;
  }

  .cta-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 0 16px;
  }

  .cta-card {
    padding: 24px 20px;
  }

  .cta-card-icon {
    width: 52px;
    height: 52px;
  }

  .cta-card-icon svg {
    width: 26px;
    height: 26px;
  }

  .cta-card h3 {
    font-size: 18px;
  }

  .features h2 {
    font-size: 22px;
    margin-bottom: 24px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .feature-card {
    padding: 20px 16px;
  }

  .footer-links {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  .hero {
    padding: 24px 0 30px;
  }

  .hero h1 {
    font-size: 24px;
  }

  .hero .tagline {
    font-size: 14px;
  }

  .logo-wrapper img {
    width: 55px;
    height: 55px;
  }

  .cta-card {
    padding: 20px 16px;
  }

  .cta-btn {
    padding: 10px 20px;
    font-size: 14px;
  }
}