:root {
    --bg: #0B1410;
    --surface: #12241C;
    --primary: #FF5A6E;
    --transition: #FF8A7A;
    --accent: #3DDC97;
    --text: #F6FFF8;
    --seed: #12241C;
  }

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

  body {
    background-color: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
  }

  /* 沙瓤细颗粒质感 */
  body::before {
    content: "";
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E");
    z-index: 9999;
  }

  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 */
  header {
    padding: 20px 0;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: 10;
  }

  .header-inner {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .header-inner img {
    height: 32px;
    width: auto;
    border-radius: 6px;
  }

  .header-inner h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    background: linear-gradient(90deg, var(--primary), var(--transition));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  /* Hero Section */
  .hero {
    position: relative;
    padding: 120px 0 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow: hidden;
  }

  .hero-arc {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150vw;
    height: 150vw;
    max-width: 1200px;
    max-height: 1200px;
    border-radius: 50%;
    background: conic-gradient(from 180deg at 50% 50%, #3DDC97 0deg, #F6FFF8 60deg, #FF8A7A 120deg, #FF5A6E 240deg, rgba(255,90,110,0) 360deg);
    opacity: 0.15;
    z-index: 1;
    filter: blur(40px);
  }
  
  .hero-arc-border {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80vw;
    height: 80vw;
    max-width: 800px;
    max-height: 800px;
    border-radius: 50%;
    border: 2px solid rgba(61, 220, 151, 0.3);
    z-index: 1;
    box-shadow: 0 0 40px rgba(255, 90, 110, 0.2) inset;
  }

  .hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 600px;
    padding: 20px;
  }

  .hero-content h2 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(90deg, #F6FFF8, var(--transition));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-content p {
    font-size: 1.1rem;
    color: #a0b8aa;
    margin-bottom: 40px;
  }

  .play-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--transition));
    border: none;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(255, 90, 110, 0.4);
    transition: transform 0.3s ease;
  }
  
  .play-btn:hover {
    transform: scale(1.05);
  }

  .play-btn svg {
    width: 30px;
    height: 30px;
    fill: #fff;
    margin-left: 5px;
  }

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

  .section-title {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 12px;
  }
  
  .section-title::before {
    content: "";
    display: block;
    width: 6px;
    height: 24px;
    background: var(--primary);
    border-radius: 3px;
  }

  .section-subtitle {
    color: #8a9e90;
    font-size: 1rem;
    margin-bottom: 40px;
  }

  /* Grid Layouts */
  .grid-3x4 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .card {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    transition: transform 0.3s ease;
  }

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

  .card img {
    width: 100%;
    height: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
  }
  
  .card-vertical {
    aspect-ratio: 3/4;
  }

  .card-horizontal {
    aspect-ratio: 16/9;
    grid-column: span 2;
  }

  .card info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 30px 15px 15px;
    background: linear-gradient(to top, rgba(11,20,16,0.9), transparent);
  }

  .card-title {
    font-size: 1.1rem;
    font-weight: 600;
  }

  /* Selected Section (Horizontal) */
  .selected-scroll {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding-bottom: 20px;
    scrollbar-width: none;
  }
  
  .selected-scroll::-webkit-scrollbar {
    display: none;
  }

  .selected-item {
    flex: 0 0 80%;
    max-width: 600px;
    border-radius: 16px;
    overflow: hidden;
  }

  .selected-item img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
  }

  /* Topic Section (Irregular shapes, tilts) */
  .topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .topic-item {
    position: relative;
    border-radius: 30px 10px 30px 10px;
    overflow: hidden;
    aspect-ratio: 1;
  }

  .topic-item:nth-child(even) {
    border-radius: 10px 30px 10px 30px;
    transform: translateY(20px);
  }
  
  .topic-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .topic-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(11,20,16,0.4);
    display: flex;
    align-items: flex-end;
    padding: 20px;
  }

  .topic-overlay span {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text);
  }

  /* Features & Reviews & FAQ */
  .features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .feature-item {
    background: var(--surface);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid rgba(61, 220, 151, 0.2);
  }
  
  .feature-item h3 {
    font-size: 1.2rem;
    color: var(--accent);
    margin-bottom: 10px;
  }

  .reviews-grid, .faq-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .review-item, .faq-item {
    background: var(--surface);
    padding: 20px 30px;
    border-radius: 12px;
  }

  .review-user {
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 8px;
  }

  .faq-item h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text);
  }

  .faq-item p {
    color: #8a9e90;
  }

  /* Download Section */
  .download-section {
    text-align: center;
    background: linear-gradient(180deg, var(--bg) 0%, var(--surface) 100%);
    padding: 100px 0;
  }

  .download-section h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
  }

  .download-btn {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary), var(--transition));
    color: #fff;
    padding: 16px 48px;
    border-radius: 30px;
    font-size: 1.2rem;
    font-weight: bold;
    transition: opacity 0.3s ease;
  }

  .download-btn:hover {
    opacity: 0.9;
  }

  /* Footer */
  footer {
    background: var(--bg);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(246, 255, 248, 0.05);
    font-size: 0.85rem;
    color: #6a7c70;
  }
  
  footer p {
    margin-bottom: 10px;
  }
  
  footer a {
    color: #6a7c70;
    transition: color 0.3s;
  }
  
  footer a:hover {
    color: var(--text);
  }

  /* Responsive */
  @media (max-width: 768px) {
    .hero-content h2 { font-size: 2rem; }
    .grid-3x4 { grid-template-columns: repeat(2, 1fr); }
    .card-horizontal { grid-column: span 2; aspect-ratio: 3/4; }
    .topics-grid { grid-template-columns: 1fr; gap: 20px; }
    .topic-item:nth-child(even) { transform: none; }
    .features-grid { grid-template-columns: 1fr; }
    .selected-item { flex: 0 0 90%; }
    .section-title { font-size: 1.5rem; }
  }

  @media (max-width: 480px) {
    .header-inner h1 { font-size: 1.2rem; }
    .hero-content h2 { font-size: 1.8rem; }
    .download-section h2 { font-size: 2rem; }
  }