:root {
  --bg-color: #0d0d0d;
  --surface-color: #1a1a1a;
  --surface-hover: #262626;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent-color: #00ff88;
  --accent-hover: #00cc6a;
  --border-color: #333333;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --max-width: 1200px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

/* Typography */
h1, h2, h3 {
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
}

p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 5rem 0;
}

/* Header */
header {
  padding: 20px 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  background: rgba(13, 13, 13, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.logo span {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

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

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

.nav-cta {
  background-color: var(--accent-color);
  color: #000 !important;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  transition: var(--transition);
}

.nav-cta:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 255, 136, 0.3);
}

/* Hero Section */
.hero {
  padding: 12rem 0 8rem;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,255,136,0.15) 0%, rgba(0,0,0,0) 70%);
  z-index: -1;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 0 2.5rem 0;
}

.hero-content {
  flex: 1;
}

.hero-visual {
  flex: 1;
  position: relative;
  height: 400px;
}

.floating-card {
  background: rgba(26, 26, 26, 0.8);
  backdrop-filter: blur(10px);
  padding: 20px 30px;
  border-radius: 16px;
  border: 1px solid var(--accent-color);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.2rem;
  position: absolute;
  box-shadow: 0 10px 30px rgba(0, 255, 136, 0.1);
  animation: float 6s ease-in-out infinite;
  white-space: nowrap;
}

.card-1 {
  top: 10%;
  left: 0%;
  animation-delay: 0s;
}

.card-2 {
  top: 45%;
  right: 5%;
  animation-delay: -2s;
}

.card-3 {
  bottom: 10%;
  left: 10%;
  animation-delay: -4s;
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
  100% { transform: translateY(0px); }
}

.btn-primary {
  display: inline-block;
  background-color: var(--accent-color);
  color: #000 !important;
  padding: 16px 40px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 12px;
  transition: var(--transition);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 255, 136, 0.4);
}

/* Features Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--surface-color);
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

/* Media & AI Section */
.media-ai-container {
  background-color: var(--surface-color);
  border-radius: 24px;
  padding: 4rem;
  text-align: center;
  border: 1px solid var(--border-color);
}

.tags-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.tag {
  background-color: var(--bg-color);
  padding: 12px 24px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
  font-weight: 600;
  transition: var(--transition);
}

.tag:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: scale(1.05);
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.pricing-card {
  background-color: var(--surface-color);
  padding: 3rem 2rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.pricing-card.popular {
  border-color: var(--accent-color);
}

.pricing-card.popular::before {
  content: '最受欢迎';
  position: absolute;
  top: 15px;
  right: -35px;
  background: var(--accent-color);
  color: #000;
  padding: 5px 40px;
  transform: rotate(45deg);
  font-size: 0.8rem;
  font-weight: bold;
}

.pricing-card:hover {
  transform: translateY(-10px);
}

.price-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.price-amount {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.price-amount span {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.price-features {
  list-style: none;
  margin-bottom: 2.5rem;
  flex-grow: 1;
}

.price-features li {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
}

.price-features li::before {
  content: '✓';
  color: var(--accent-color);
  margin-right: 10px;
  font-weight: bold;
}

.btn-block {
  display: block;
  text-align: center;
  width: 100%;
}

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.review-card {
  background-color: var(--surface-color);
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.stars {
  color: #ffb400;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.review-text {
  font-style: italic;
  margin-bottom: 1.5rem;
}

.reviewer {
  font-weight: 600;
  color: var(--text-primary);
}

/* FAQ Section */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

.faq-question {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

/* Subpages Content */
.page-header {
  padding: 10rem 0 4rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 4rem;
}

.content-block {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--surface-color);
  padding: 3rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.content-block h2 {
  text-align: left;
  font-size: 1.8rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.content-block p, .content-block ul {
  margin-bottom: 1.5rem;
}

.content-block ul {
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.content-block li {
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.copyright {
  text-align: center;
  margin-top: 3rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .media-ai-container {
    padding: 2rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 8rem;
  }
  
  .hero p {
    margin: 0 auto 2.5rem auto;
  }

  .hero-visual {
    width: 100%;
    height: 300px;
  }
  
  .card-1 { top: 0; left: 50%; transform: translateX(-50%); animation: floatMobile 6s ease-in-out infinite; }
  .card-2 { top: 40%; left: 50%; transform: translateX(-50%); animation: floatMobile 6s ease-in-out infinite -2s; }
  .card-3 { bottom: 0; left: 50%; transform: translateX(-50%); animation: floatMobile 6s ease-in-out infinite -4s; }

  @keyframes floatMobile {
    0% { transform: translate(-50%, 0px); }
    50% { transform: translate(-50%, -15px); }
    100% { transform: translate(-50%, 0px); }
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
  
  .content-block {
    padding: 1.5rem;
  }
}