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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: #000;
  color: #fff;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  padding: 20px 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 600;
}

.logo-icon {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, #ff6b35, #f7931e);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

.nav-link {
  color: #fff;
  text-decoration: none;
  font-size: 16px;
  transition: opacity 0.3s ease;
}

.nav-link:hover {
  opacity: 0.7;
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  min-height: 30vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 90px;
  align-items: center;
}

.hero h1 {
  font-size: 64px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-description {
  font-size: 18px;
  line-height: 1.6;
  color: #ccc;
  margin-bottom: 40px;
}

.highlight {
  color: #ff6b35;
}

.app-store-button {
  display: inline-block;
  margin-top: 10px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 48px;
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  color: #000;
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
  min-width: 200px;
  justify-content: center;
}

.download-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.05), transparent);
  transition: left 0.5s ease;
}

.download-btn:hover::before {
  left: 100%;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  background: #f8f8f8;
  border-color: #d0d0d0;
}

.download-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  background: #f0f0f0;
}

.btn-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  object-fit: contain;
}

.btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.btn-title {
  font-size: 18px;
  font-weight: 700;
  color: #000;
}

.btn-subtitle {
  font-size: 12px;
  opacity: 0.7;
  font-weight: 400;
  color: #333;
}

.hero-visual {
  position: relative;
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image {
  position: relative;
  z-index: 2;
  display: inline-block;
}

.app-screenshot {
  max-width: 100%;
  width: auto;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

.app-screenshot:hover {
  transform: translateY(-5px);
}

/* Large Play Button Container */
.play-button-container {
  width: 100%;
  max-width: 100%;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.1) 0%, rgba(0, 191, 255, 0.1) 100%);
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
  position: relative;
  overflow: hidden;
  padding: 40px;
}

.play-button-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(255, 107, 53, 0.2) 0%, transparent 70%);
  animation: pulse-glow 3s ease-in-out infinite;
}

.play-button-large {
  background: rgba(255, 107, 53, 0.95);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 180px;
  height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 12px 48px rgba(255, 107, 53, 0.5);
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 2;
}

.play-button-large:hover {
  background: rgba(255, 107, 53, 1);
  transform: scale(1.1);
  box-shadow: 0 16px 64px rgba(255, 107, 53, 0.7);
}

.play-icon-large {
  font-size: 72px;
  margin-bottom: 12px;
  line-height: 1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.play-text-large {
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  line-height: 1.2;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

@keyframes pulse-glow {
  0%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.05);
  }
}

.glow-effect {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 191, 255, 0.3) 0%, rgba(0, 191, 255, 0.1) 40%, transparent 70%);
  border-radius: 50%;
  filter: blur(40px);
  animation: pulse 4s ease-in-out infinite;
  z-index: 1;
}

@keyframes pulse {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.3;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 0.5;
  }
}

/* Highlights Section */
.highlights {
  padding: 100px 0;
}

.highlights h2 {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: #999;
  margin-bottom: 80px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 80px 60px;
}

.feature-item {
  display: flex;
  gap: 40px;
  align-items: center;
}

.phone-mockup {
  flex-shrink: 0;
}

.phone-mockup img {
  width: 200px;
  height: 400px;
  object-fit: cover;
  border-radius: 25px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-content h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-content p {
  color: #ccc;
  font-size: 16px;
  line-height: 1.5;
}

.feature-detail {
  margin-top: 8px;
  font-size: 14px !important;
  color: #999 !important;
}

/* Other Features */
.other-features {
  padding: 100px 0 60px;
  text-align: center;
}

.other-features h2 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* Feature Sections */
.similar-detection,
.video-compression {
  padding: 60px 0;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.feature-text h3 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 20px;
}

.feature-description {
  font-size: 18px;
  color: #ccc;
  line-height: 1.6;
  margin-bottom: 40px;
}

.feature-points {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.point {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.bullet {
  color: #ff6b35;
  font-size: 20px;
  margin-top: 2px;
}

.point strong {
  display: block;
  font-size: 16px;
  margin-bottom: 4px;
}

.point-detail {
  font-size: 14px;
  color: #999;
}

.feature-phones {
  display: flex;
  gap: 20px;
  justify-content: center;
}

.feature-phones .phone-mockup img {
  width: 180px;
  height: 360px;
}

/* FAQ Section */
.faq {
  padding: 100px 0;
}

.faq h2 {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid #333;
}

.faq-question {
  width: 100%;
  padding: 24px 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 18px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.3s ease;
}

.faq-question:hover {
  color: #ff6b35;
}

.faq-icon {
  font-size: 24px;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

.faq-answer p {
  padding: 0 0 24px 0;
  color: #ccc;
  line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero h1 {
    font-size: 48px;
  }

  .hero-visual {
    height: 300px;
    margin-top: 40px;
  }

  .app-screenshot {
    max-width: 100%;
  }

  .play-button-container {
    min-height: 200px;
    padding: 20px;
  }

  .play-button-large {
    width: 140px;
    height: 140px;
  }

  .play-icon-large {
    font-size: 56px;
  }

  .play-text-large {
    font-size: 14px;
  }

  .download-btn {
    padding: 10px 36px;
    font-size: 15px;
    min-width: 180px;
  }

  .btn-title {
    font-size: 16px;
  }

  .btn-subtitle {
    font-size: 11px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .feature-item {
    flex-direction: column;
    text-align: center;
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .feature-phones {
    order: -1;
  }

  .feature-text h3 {
    font-size: 28px;
  }

  .highlights h2,
  .other-features h2,
  .faq h2 {
    font-size: 36px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 36px;
  }

  .download-btn {
    padding: 8px 28px;
    font-size: 14px;
    gap: 10px;
    min-width: 160px;
  }

  .btn-icon {
    width: 20px;
    height: 20px;
  }

  .btn-title {
    font-size: 15px;
  }

  .btn-subtitle {
    font-size: 10px;
  }

  .phone-mockup img {
    width: 160px;
    height: 320px;
  }

  .feature-phones .phone-mockup img {
    width: 140px;
    height: 280px;
  }
}

/* Footer */
.footer {
  background: rgba(0, 0, 0, 0.9);
  border-top: 1px solid #333;
  padding: 40px 0;
  margin-top: 80px;
}

.footer-content {
  text-align: center;
}

.copyright {
  color: #ccc;
  font-size: 14px;
  margin-bottom: 8px;
}

.copyright-en {
  color: #999;
  font-size: 12px;
  opacity: 0.8;
}