:root {
    --purple-deep: #1a0b2e;
    --purple-main: #7b2cbf;
    --purple-light: #c77dff;
    --purple-glow: #e0aaff;
    --bg-dark: #0d0514;
    --text-main: #f3e8ff;
    --text-muted: #b39ddb;
    --card-bg: #1e1133;
    --border-radius: 16px;
  }

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

  body {
    font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

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

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

  /* Header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 5, 20, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(199, 125, 255, 0.15);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--purple-glow);
    letter-spacing: 1px;
  }

  .brand img {
    height: 32px;
    width: auto;
  }

  .nav-links {
    display: none;
    gap: 24px;
    font-size: 15px;
    color: var(--text-muted);
  }

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

  .header-cta {
    display: none;
    background: linear-gradient(135deg, var(--purple-main), #9d4edd);
    color: #fff;
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    transition: transform 0.2s;
  }

  .header-cta:active {
    transform: scale(0.95);
  }

  /* Hero */
  .hero {
    position: relative;
    padding: 60px 0 80px;
    text-align: center;
    background: radial-gradient(circle at 50% 0%, rgba(123, 44, 191, 0.4) 0%, transparent 60%);
  }

  .hero h1 {
    font-size: 32px;
    line-height: 1.3;
    margin-bottom: 16px;
    background: linear-gradient(90deg, #fff, var(--purple-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero p {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 32px;
  }

  .btn-download-main {
    display: inline-block;
    background: linear-gradient(135deg, #9d4edd, var(--purple-main));
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    padding: 16px 48px;
    border-radius: 30px;
    box-shadow: 0 8px 24px rgba(123, 44, 191, 0.5);
    transition: transform 0.2s, box-shadow 0.2s;
  }

  .btn-download-main:active {
    transform: translateY(2px);
    box-shadow: 0 4px 12px rgba(123, 44, 191, 0.5);
  }

  .hero-preview {
    margin-top: 48px;
    display: flex;
    justify-content: center;
    gap: 12px;
    overflow: hidden;
    padding: 10px 0;
  }

  .hero-preview img {
    width: 120px;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.6);
    border: 1px solid rgba(199, 125, 255, 0.2);
  }

  /* Sections */
  section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 26px;
    text-align: center;
    margin-bottom: 12px;
    color: var(--purple-glow);
  }

  .section-subtitle {
    text-align: center;
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 40px;
  }

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

  .feature-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--border-radius);
    border: 1px solid rgba(199, 125, 255, 0.1);
    text-align: center;
  }

  .feature-card h3 {
    font-size: 18px;
    color: var(--purple-light);
    margin-bottom: 10px;
  }

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

  /* AI Picker */
  .ai-picker {
    background: linear-gradient(180deg, var(--bg-dark), var(--purple-deep));
    border-radius: var(--border-radius);
    padding: 30px 20px;
    text-align: center;
  }

  .ai-picker h2 {
    margin-bottom: 20px;
  }

  .picker-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
  }

  .picker-tags span {
    background: rgba(199, 125, 255, 0.15);
    border: 1px solid var(--purple-main);
    color: var(--purple-light);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
  }

  /* Gallery / Topics */
  .gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .gallery-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 3 / 4;
  }

  .gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .gallery-item .play-icon {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(123, 44, 191, 0.8);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 10px;
    backdrop-filter: blur(4px);
  }

  /* Reviews */
  .reviews-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .review-item {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--purple-main);
  }

  .review-item p {
    font-size: 14px;
    color: var(--text-main);
    margin-bottom: 12px;
  }

  .review-user {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
  }

  /* FAQ */
  .faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .faq-item {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px;
  }

  .faq-item h3 {
    font-size: 16px;
    color: var(--purple-light);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
  }

  .faq-item h3::before {
    content: "Q";
    display: inline-block;
    background: var(--purple-main);
    color: #fff;
    width: 24px;
    height: 24px;
    text-align: center;
    line-height: 24px;
    border-radius: 50%;
    font-size: 14px;
    margin-right: 10px;
  }

  .faq-item p {
    font-size: 14px;
    color: var(--text-muted);
    padding-left: 34px;
  }

  /* Download Section */
  .download-section {
    text-align: center;
    background: radial-gradient(circle at 50% 100%, rgba(123, 44, 191, 0.4) 0%, transparent 70%);
    padding: 80px 0;
  }

  .download-section h2 {
    font-size: 28px;
    margin-bottom: 16px;
    color: #fff;
  }

  .download-section p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 32px;
  }

  .download-box {
    display: inline-block;
    background: rgba(30, 17, 51, 0.8);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid var(--purple-main);
    box-shadow: 0 0 40px rgba(123, 44, 191, 0.3);
  }

  /* Footer */
  .site-footer {
    background: #07020c;
    padding: 40px 0;
    text-align: center;
    font-size: 12px;
    color: #6b5b7b;
    border-top: 1px solid rgba(199, 125, 255, 0.1);
  }

  .site-footer p {
    margin-bottom: 8px;
  }

  .site-footer a {
    color: #6b5b7b;
    text-decoration: underline;
  }

  .site-footer a:hover {
    color: var(--purple-light);
  }

  /* Responsive */
  @media (min-width: 768px) {
    .nav-links {
      display: flex;
    }
    .header-cta {
      display: block;
    }
    .hero h1 {
      font-size: 48px;
    }
    .features-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .gallery-grid {
      grid-template-columns: repeat(3, 1fr);
    }
    .reviews-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
    }
    .faq-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
    }
    .hero-preview img {
      width: 160px;
      height: 240px;
    }
  }

  @media (min-width: 1024px) {
    .hero h1 {
      font-size: 56px;
    }
    .features-grid {
      grid-template-columns: repeat(4, 1fr);
    }
    .gallery-grid {
      grid-template-columns: repeat(4, 1fr);
    }
    .reviews-list {
      grid-template-columns: repeat(3, 1fr);
    }
  }