:root {
    --brand: #6c2bd9;
    --brand-dark: #3f158f;
    --accent: #ff4d6d;
    --bg: #0f0915;
    --bg-soft: #1a1023;
    --card: #22152e;
    --text: #f4eeff;
    --muted: #b6a8c8;
    --line: rgba(255,255,255,.08);
    --radius: 18px;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  img { display: block; max-width: 100%; }
  a { color: inherit; text-decoration: none; }
  .wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 20px; }

  /* header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(15,9,21,.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
  }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
  }
  .brand-box { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: .5px; }
  .brand-box img { height: 34px; width: auto; border-radius: 8px; }
  .nav-links { display: none; gap: 26px; font-size: 15px; color: var(--muted); }
  .nav-links a:hover { color: var(--text); }
  .header-cta {
    display: none;
    background: linear-gradient(135deg, var(--brand), var(--accent));
    color: #fff;
    padding: 9px 20px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
  }

  /* buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--brand), var(--accent));
    color: #fff;
    padding: 13px 30px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 700;
    box-shadow: 0 10px 30px rgba(108,43,217,.35);
    transition: transform .25s ease, box-shadow .25s ease;
  }
  .btn:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(255,77,109,.35); }
  .btn-ghost {
    background: transparent;
    border: 1px solid rgba(255,255,255,.28);
    box-shadow: none;
    color: var(--text);
  }
  .btn-ghost:hover { border-color: var(--accent); box-shadow: none; }

  /* hero carousel */
  .hero { position: relative; padding: 34px 0 60px; overflow: hidden; }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 18% 12%, rgba(108,43,217,.35), transparent 55%),
                radial-gradient(circle at 88% 80%, rgba(255,77,109,.22), transparent 50%);
    pointer-events: none;
  }
  .hero-inner { position: relative; }
  .carousel { position: relative; border-radius: 26px; overflow: hidden; border: 1px solid var(--line); background: var(--bg-soft); }
  .slides { position: relative; height: 400px; }
  .slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity .7s ease;
    pointer-events: none;
  }
  .slide.is-active { opacity: 1; pointer-events: auto; }
  .slide img { width: 100%; height: 100%; object-fit: cover; }
  .slide-caption {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 60px 24px 22px;
    background: linear-gradient(to top, rgba(10,5,15,.95), rgba(10,5,15,.55) 60%, transparent);
  }
  .slide-caption span { display: inline-block; font-size: 13px; color: #ffc4d2; letter-spacing: 1px; margin-bottom: 6px; }
  .slide-caption h3 { font-size: 20px; font-weight: 700; }
  .carousel-dots { display: flex; justify-content: center; gap: 10px; padding: 16px 0; background: var(--bg-soft); }
  .dot {
    width: 26px; height: 5px; border-radius: 999px; border: none;
    background: rgba(255,255,255,.22); cursor: pointer; transition: background .3s;
  }
  .dot.is-active { background: linear-gradient(90deg, var(--brand), var(--accent)); }

  .hero-copy { margin-top: 34px; }
  .eyebrow {
    display: inline-block;
    font-size: 13px;
    color: #e7c9ff;
    background: rgba(108,43,217,.22);
    border: 1px solid rgba(108,43,217,.5);
    padding: 5px 14px;
    border-radius: 999px;
    margin-bottom: 16px;
  }
  .hero-copy h1 {
    font-size: 32px;
    line-height: 1.3;
    font-weight: 800;
    letter-spacing: -.5px;
    margin-bottom: 16px;
    background: linear-gradient(120deg, #fff, #d9b8ff 60%, #ffb3c4);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .hero-copy p { color: var(--muted); font-size: 16px; max-width: 560px; margin-bottom: 10px; }
  .hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 24px; }
  .hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
  .tag {
    font-size: 13px; color: var(--muted);
    border: 1px solid var(--line);
    background: rgba(255,255,255,.03);
    padding: 6px 14px; border-radius: 999px;
  }

  /* generic section */
  section { padding: 72px 0; position: relative; }
  .section-head { max-width: 640px; margin-bottom: 42px; }
  .section-head .kicker {
    font-size: 13px; letter-spacing: 2px; color: var(--accent); font-weight: 700; margin-bottom: 10px;
  }
  .section-head h2 { font-size: 28px; line-height: 1.35; font-weight: 800; margin-bottom: 14px; }
  .section-head p { color: var(--muted); font-size: 15.5px; }

  /* features */
  .feature-grid { display: grid; gap: 18px; }
  .feature-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 24px;
    transition: transform .25s ease, border-color .25s ease;
  }
  .feature-card:hover { transform: translateY(-4px); border-color: rgba(255,77,109,.45); }
  .feature-card .num {
    width: 38px; height: 38px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(108,43,217,.28); color: #e2ccff; font-weight: 800; font-size: 15px; margin-bottom: 16px;
  }
  .feature-card h3 { font-size: 18px; margin-bottom: 8px; }
  .feature-card p { color: var(--muted); font-size: 14.5px; }

  /* display wall */
  .wall { background: linear-gradient(180deg, var(--bg), var(--bg-soft)); }
  .wall-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .wall-item { position: relative; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
  .wall-item img { width: 100%; aspect-ratio: 3/4; object-fit: cover; transition: transform .5s ease; }
  .wall-item:hover img { transform: scale(1.05); }
  .wall-item span {
    position: absolute; left: 0; right: 0; bottom: 0;
    padding: 26px 12px 10px;
    font-size: 13px; font-weight: 600;
    background: linear-gradient(to top, rgba(8,4,12,.92), transparent);
  }

  /* steps */
  .steps { display: grid; gap: 16px; }
  .step {
    display: flex; gap: 18px; align-items: flex-start;
    background: var(--card); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 22px 22px;
  }
  .step-index {
    flex: 0 0 auto;
    width: 34px; height: 34px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--brand), var(--accent));
    font-weight: 800; font-size: 14px;
  }
  .step h3 { font-size: 17px; margin-bottom: 6px; }
  .step p { color: var(--muted); font-size: 14.5px; }

  /* faq */
  .faq-list { display: grid; gap: 12px; }
  .faq-item {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 14px; padding: 20px 22px;
  }
  .faq-item h3 { font-size: 16px; margin-bottom: 8px; color: #f0e2ff; }
  .faq-item p { color: var(--muted); font-size: 14.5px; }

  /* download */
  .download { background: radial-gradient(circle at 50% 0%, rgba(108,43,217,.4), transparent 65%), var(--bg); }
  .download-card {
    text-align: center;
    background: var(--bg-soft);
    border: 1px solid rgba(108,43,217,.45);
    border-radius: 26px;
    padding: 52px 24px;
  }
  .download-card h2 { font-size: 27px; margin-bottom: 14px; }
  .download-card p { color: var(--muted); max-width: 520px; margin: 0 auto 26px; font-size: 15.5px; }
  .download-meta { margin-top: 26px; font-size: 13px; color: var(--muted); }

  /* footer */
  .site-footer {
    border-top: 1px solid var(--line);
    padding: 30px 0 38px;
    font-size: 12.5px;
    color: #8a7c9c;
    background: #0b0610;
  }
  .footer-inner { display: flex; flex-direction: column; gap: 10px; text-align: center; }
  .footer-inner a { color: #8a7c9c; }
  .footer-inner a:hover { color: var(--muted); }
  .footer-time { font-size: 12px; color: #6f6380; }

  /* responsive */
  @media (min-width: 768px) {
    .nav-links { display: flex; }
    .header-cta { display: inline-flex; }
    .slides { height: 460px; }
    .hero { padding: 44px 0 72px; }
    .hero-copy h1 { font-size: 42px; }
    .hero-copy p { font-size: 17px; }
    .section-head h2 { font-size: 34px; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .wall-grid { grid-template-columns: repeat(3, 1fr); }
    .steps { grid-template-columns: repeat(3, 1fr); }
    .faq-list { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; flex-wrap: wrap; }
    .download-card { padding: 70px 60px; }
  }
  @media (min-width: 1024px) {
    .hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 46px; align-items: center; }
    .hero-copy { margin-top: 0; }
    .slides { height: 520px; }
    .hero-copy h1 { font-size: 50px; }
    .feature-grid { grid-template-columns: repeat(4, 1fr); }
    .wall-grid { grid-template-columns: repeat(5, 1fr); }
    .section-head h2 { font-size: 38px; }
  }