:root {
    --bg-dark: #0f1015;
    --bg-card: #1a1b23;
    --bg-card-hover: #22232d;
    --primary: #ffd633;
    --primary-glow: rgba(255, 214, 51, 0.4);
    --secondary: #ff4d4d;
    --text-main: #ffffff;
    --text-sub: #a0a0ab;
    --border-color: #2a2b36;
    --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 {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-family);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  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%;
    height: 64px;
    background: rgba(15, 16, 21, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
  }

  .header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  .logo-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
  }

  .logo-wrap img {
    height: 32px;
    width: auto;
    border-radius: 6px;
  }

  .header-nav {
    display: none;
  }

  .header-nav a {
    margin-left: 24px;
    font-size: 15px;
    color: var(--text-sub);
    transition: color 0.3s;
  }

  .header-nav a:hover {
    color: var(--primary);
  }

  /* Hero Section */
  .hero-section {
    padding: 120px 0 60px;
    position: relative;
    overflow: hidden;
  }

  .hero-section::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.3;
    z-index: -1;
    border-radius: 50%;
  }

  .hero-layout {
    display: flex;
    flex-direction: column;
    gap: 40px;
  }

  .hero-text {
    flex: 1;
    text-align: left;
  }

  .hero-text h1 {
    font-size: 36px;
    line-height: 1.3;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(90deg, #fff, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
  }

  .hero-text p {
    font-size: 16px;
    color: var(--text-sub);
    margin-bottom: 30px;
    max-width: 800px;
  }

  .hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
  }

  .btn-primary {
    background: var(--primary);
    color: #000;
    font-size: 18px;
    font-weight: 700;
    padding: 14px 40px;
    border-radius: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 20px var(--primary-glow);
    border: none;
    cursor: pointer;
  }

  .btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px var(--primary-glow);
  }

  .btn-secondary {
    background: transparent;
    color: var(--primary);
    font-size: 16px;
    font-weight: 600;
    padding: 14px 30px;
    border-radius: 30px;
    border: 2px solid var(--primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
  }

  .btn-secondary:hover {
    background: rgba(255, 214, 51, 0.1);
  }

  /* Phone Mockup */
  .phone-mockup {
    width: 280px;
    margin: 0 auto;
    border-radius: 40px;
    border: 8px solid #333;
    background: #000;
    position: relative;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    overflow: hidden;
    flex-shrink: 0;
  }

  .phone-mockup img {
    width: 100%;
    height: auto;
    display: block;
  }

  /* Section Common */
  section {
    padding: 60px 0;
  }

  .section-header {
    text-align: center;
    margin-bottom: 40px;
  }

  .section-header h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 12px;
    color: #fff;
  }

  .section-header p {
    font-size: 15px;
    color: var(--text-sub);
  }

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

  .feature-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, background 0.3s;
  }

  .feature-card:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
  }

  .feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary);
  }

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

  /* Screenshots / Gallery */
  .gallery-scroll {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    padding-bottom: 20px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--bg-card);
  }
  
  .gallery-scroll::-webkit-scrollbar {
    height: 6px;
  }
  .gallery-scroll::-webkit-scrollbar-track {
    background: var(--bg-card);
    border-radius: 10px;
  }
  .gallery-scroll::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
  }

  .gallery-item {
    flex: 0 0 160px;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  }

  .gallery-item img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    transition: transform 0.3s;
  }

  .gallery-item:hover img {
    transform: scale(1.05);
  }

  /* Topics */
  .topics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .topic-card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
  }

  .topic-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
  }

  .topic-content {
    padding: 20px;
  }

  .topic-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #fff;
  }

  .topic-content p {
    font-size: 14px;
    color: var(--text-sub);
    margin-bottom: 16px;
  }

  .topic-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 214, 51, 0.15);
    color: var(--primary);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
  }

  /* Reviews / Danmaku */
  .review-section {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #15161c 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
  }

  .danmaku-container {
    height: 60px;
    overflow: hidden;
    position: relative;
    background: rgba(0,0,0,0.3);
    border-radius: 30px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
  }

  .danmaku-track {
    display: flex;
    white-space: nowrap;
    animation: scroll-left 20s linear infinite;
  }

  .danmaku-item {
    font-size: 14px;
    color: var(--primary);
    padding: 0 30px;
    font-weight: 600;
  }

  @keyframes scroll-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
  }

  .reviews-text {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 30px;
  }

  .review-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
  }

  .review-card p {
    font-size: 15px;
    color: #e0e0e0;
    margin-bottom: 10px;
    font-style: italic;
  }

  .review-user {
    font-size: 13px;
    color: var(--text-sub);
    text-align: right;
  }

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

  .faq-item {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
  }

  .faq-question {
    padding: 20px;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
  }

  .faq-question::after {
    content: '+';
    font-size: 20px;
    color: var(--primary);
    transition: transform 0.3s;
  }

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

  .faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s;
    font-size: 14px;
    color: var(--text-sub);
  }

  .faq-item.active .faq-answer {
    padding: 0 20px 20px;
    max-height: 200px;
  }

  /* Download */
  .download-section {
    text-align: center;
    padding: 80px 0;
  }

  .download-box {
    background: linear-gradient(135deg, #1f202b 0%, #2a2b3a 100%);
    border-radius: 24px;
    padding: 50px 20px;
    border: 1px solid #3a3b4c;
    position: relative;
    overflow: hidden;
  }

  .download-box::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0.4;
    z-index: 0;
  }

  .download-box > * {
    position: relative;
    z-index: 1;
  }

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

  .download-box p {
    color: var(--text-sub);
    margin-bottom: 30px;
  }

  .download-btn-large {
    display: inline-block;
    background: var(--primary);
    color: #000;
    font-size: 20px;
    font-weight: 800;
    padding: 18px 60px;
    border-radius: 40px;
    transition: all 0.3s;
    box-shadow: 0 6px 24px var(--primary-glow);
  }

  .download-btn-large:hover {
    background: #ffea66;
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--primary-glow);
  }

  /* Footer */
  .site-footer {
    background: #0a0b0e;
    padding: 40px 0 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-sub);
    font-size: 13px;
  }

  .footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    color: var(--primary);
    font-weight: 700;
    font-size: 16px;
  }

  .footer-logo img {
    height: 28px;
    width: auto;
    border-radius: 4px;
  }

  .footer-time {
    margin-top: 16px;
    font-size: 12px;
    color: #555;
  }

  /* Breakpoints */
  @media (min-width: 768px) {
    .header-nav { display: block; }
    .hero-layout { flex-direction: row; align-items: center; gap: 60px; }
    .hero-text h1 { font-size: 48px; }
    .hero-text p { font-size: 18px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .topics-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-text { flex-direction: row; flex-wrap: wrap; }
    .review-card { flex: 1 1 calc(50% - 10px); }
    .gallery-item { flex: 0 0 220px; }
    .gallery-item img { height: 320px; }
    .phone-mockup { width: 320px; }
    .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .faq-item.active .faq-answer { max-height: 300px; }
  }

  @media (min-width: 1024px) {
    .hero-text h1 { font-size: 56px; }
    .features-grid { grid-template-columns: repeat(4, 1fr); }
    .topics-grid { grid-template-columns: repeat(3, 1fr); }
    .phone-mockup { width: 360px; }
    .download-box { padding: 80px 40px; }
    .download-box h2 { font-size: 36px; }
    .review-card { flex: 1 1 calc(33.333% - 14px); }
  }