:root {
    --bg-dark: #120612;
    --bg-darker: #0a030a;
    --primary: #ff2a5f;
    --primary-hover: #e01f4f;
    --text-main: #ffffff;
    --text-muted: #b3a1b3;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --radius-md: 12px;
    --radius-lg: 24px;
    --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", STHeiti, "Microsoft Yahei", Tahoma, Simsun, sans-serif;
  }

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

  body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
  }

  a {
    text-decoration: none;
    color: inherit;
  }

  img {
    max-width: 100%;
    display: block;
  }

  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  /* Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 0;
    background: rgba(18, 6, 18, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
  }

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

  .logo-group {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo-group img {
    height: 32px;
    width: auto;
  }

  .logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
  }

  .nav-links {
    display: none;
  }

  .header-cta {
    background-color: var(--primary);
    color: #fff;
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    transition: background 0.3s;
  }

  .header-cta:hover {
    background-color: var(--primary-hover);
  }

  /* Hero */
  .hero {
    padding: 120px 0 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100vw;
    background: radial-gradient(circle, rgba(255, 42, 95, 0.15) 0%, transparent 60%);
    z-index: -1;
  }

  .hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 42, 95, 0.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 24px;
    border: 1px solid rgba(255, 42, 95, 0.3);
  }

  .hero h1 {
    font-size: 36px;
    line-height: 1.3;
    margin-bottom: 20px;
    font-weight: 800;
  }

  .hero h1 span {
    color: var(--primary);
  }

  .hero-desc {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto 40px;
  }

  .hero-ctas {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
  }

  .btn-primary {
    background-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 42, 95, 0.4);
  }

  .btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
  }

  .btn-outline {
    background: transparent;
    color: #fff;
    border: 1px solid var(--border-color);
  }

  .btn-outline:hover {
    background: var(--card-bg);
  }

  .hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
  }

  .stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .stat-num {
    font-size: 24px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 4px;
  }

  .stat-label {
    font-size: 12px;
    color: var(--text-muted);
  }

  /* Section Common */
  section {
    padding: 80px 0;
  }

  .section-header {
    text-align: center;
    margin-bottom: 50px;
  }

  .section-title {
    font-size: 28px;
    margin-bottom: 16px;
    font-weight: 700;
  }

  .section-subtitle {
    color: var(--text-muted);
    font-size: 15px;
  }

  /* Product Scene */
  .scene-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .scene-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
  }

  .scene-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 3/4;
    transition: transform 0.4s;
  }

  .scene-card:hover img {
    transform: scale(1.05);
  }

  .scene-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px 15px 15px;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 100%);
  }

  .scene-num {
    font-size: 12px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 4px;
  }

  .scene-name {
    font-size: 16px;
    font-weight: 600;
  }

  /* Features */
  .features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 30px 24px;
    border-radius: var(--radius-lg);
    transition: border-color 0.3s;
  }

  .feature-card:hover {
    border-color: rgba(255, 42, 95, 0.5);
  }

  .feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 42, 95, 0.1);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 20px;
  }

  .feature-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
  }

  .feature-card p {
    color: var(--text-muted);
    font-size: 14px;
  }

  /* Steps */
  .steps-wrap {
    display: flex;
    flex-direction: column;
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
  }

  .step-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
  }

  .step-num {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 18px;
  }

  .step-content h3 {
    font-size: 18px;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .step-status {
    font-size: 12px;
    padding: 2px 8px;
    background: rgba(255, 42, 95, 0.15);
    color: var(--primary);
    border-radius: 4px;
    font-weight: normal;
  }

  .step-content p {
    color: var(--text-muted);
    font-size: 14px;
  }

  /* Reviews */
  .reviews-scroll {
    display: flex;
    overflow-x: auto;
    gap: 20px;
    padding-bottom: 20px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .reviews-scroll::-webkit-scrollbar {
    display: none;
  }

  .review-card {
    flex: 0 0 300px;
    scroll-snap-align: start;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
  }

  .review-time {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-family: monospace;
  }

  .review-text {
    font-size: 15px;
    flex-grow: 1;
    margin-bottom: 20px;
  }

  .review-user {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  
  .review-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: #fff;
  }

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

  .faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
  }

  .faq-q {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    list-style: none;
  }

  .faq-q::-webkit-details-marker {
    display: none;
  }

  .faq-q::after {
    content: '+';
    font-size: 20px;
    color: var(--text-muted);
    font-weight: normal;
  }

  details[open] .faq-q::after {
    content: '-';
    color: var(--primary);
  }

  .faq-a {
    padding-top: 15px;
    color: var(--text-muted);
    font-size: 14px;
  }

  /* Download */
  .download-section {
    text-align: center;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
    border-radius: var(--radius-lg);
    padding: 60px 20px;
    margin: 0 20px 60px;
    border: 1px solid var(--border-color);
  }

  .download-qr {
    width: 160px;
    height: 160px;
    background: #fff;
    margin: 0 auto 24px;
    border-radius: var(--radius-md);
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .download-qr img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
  }

  .download-title {
    font-size: 24px;
    margin-bottom: 12px;
  }

  .download-desc {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 20px;
  }

  .download-info {
    display: flex;
    justify-content: center;
    gap: 20px;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 30px;
    flex-wrap: wrap;
  }

  .download-info span {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  
  .download-info span::before {
    content: '';
    width: 4px;
    height: 4px;
    background: var(--primary);
    border-radius: 50%;
  }

  /* Footer */
  .site-footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px;
    font-size: 13px;
    color: var(--text-muted);
  }

  .footer-top {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
    margin-bottom: 40px;
  }

  .footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }

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

  .footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
  }
  
  .footer-bottom p {
    font-size: 12px;
  }

  /* Media Queries */
  @media (min-width: 768px) {
    .hero h1 { font-size: 48px; }
    .hero-desc { font-size: 18px; }
    .scene-grid { grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .step-item { padding: 30px; }
    .download-qr { width: 200px; height: 200px; }
    .footer-bottom { flex-direction: row; justify-content: space-between; text-align: left; }
    .nav-links {
      display: flex;
      gap: 30px;
      font-size: 15px;
      color: var(--text-muted);
    }
    .nav-links a:hover { color: #fff; }
    .logo-group img { height: 36px; }
  }

  @media (min-width: 1024px) {
    .hero { padding: 160px 0 100px; }
    .hero h1 { font-size: 56px; }
    .hero::before { width: 800px; height: 800px; }
    .hero-stats { gap: 80px; }
    .stat-num { font-size: 32px; }
    .stat-label { font-size: 14px; }
    .features-grid { grid-template-columns: repeat(3, 1fr); gap: 30px; }
    .steps-wrap { flex-direction: row; max-width: 100%; justify-content: center; }
    .step-item { flex: 1; flex-direction: column; gap: 16px; }
    .step-num { width: 48px; height: 48px; font-size: 20px; }
    .scene-card img { aspect-ratio: auto; height: 380px; }
    .review-card { flex: 0 0 360px; padding: 30px; }
    .download-section { margin: 0 auto 80px; max-width: 1000px; }
  }