* { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #1a1a1a;
    background-color: #ffffff;
    background-image:
      linear-gradient(rgba(46, 134, 222, 0.035) 1px, transparent 1px),
      linear-gradient(90deg, rgba(46, 134, 222, 0.035) 1px, transparent 1px);
    background-size: 28px 28px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }
  .wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 20px; }
  .brand-blue { color: #2e86de; }
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    background: #2e86de; color: #fff; border: none; cursor: pointer;
    font-size: 15px; font-weight: 600; padding: 13px 28px; border-radius: 8px;
    transition: background .2s, transform .2s, box-shadow .2s;
    box-shadow: 0 4px 14px rgba(46, 134, 222, 0.25);
    font-family: inherit;
  }
  .btn:hover { background: #1f6fc2; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(46,134,222,.32); }
  .btn-ghost {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    background: #fff; color: #1a1a1a; border: 1px solid #d7e2ee; cursor: pointer;
    font-size: 15px; font-weight: 600; padding: 12px 28px; border-radius: 8px;
    transition: border-color .2s, color .2s, transform .2s; font-family: inherit;
  }
  .btn-ghost:hover { border-color: #2e86de; color: #2e86de; transform: translateY(-1px); }

  /* header */
  .site-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #edf2f7;
  }
  .header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
  .brand { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; letter-spacing: .5px; }
  .brand img { height: 32px; width: auto; border-radius: 7px; }
  .nav { display: flex; align-items: center; gap: 4px; overflow-x: auto; scrollbar-width: none; }
  .nav::-webkit-scrollbar { display: none; }
  .nav a {
    font-size: 14px; color: #4a5568; padding: 8px 11px; border-radius: 6px;
    white-space: nowrap; transition: color .2s, background .2s;
  }
  .nav a:hover { color: #2e86de; background: #f0f7ff; }
  .nav-dl { display: none; }
  .menu-toggle {
    display: none; background: none; border: 1px solid #d7e2ee; border-radius: 6px;
    width: 40px; height: 36px; cursor: pointer; font-size: 18px; line-height: 1; color: #1a1a1a;
  }

  /* hero */
  .hero { padding: 56px 0 48px; }
  .hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center; }
  .hero-badge {
    display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600;
    color: #2e86de; background: #eaf4ff; border: 1px solid #cfe5ff;
    padding: 5px 12px; border-radius: 999px; margin-bottom: 18px;
  }
  .hero h1 { font-size: 44px; line-height: 1.2; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 18px; }
  .hero p.lead { font-size: 16px; color: #55606e; margin-bottom: 12px; }
  .hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 26px; }
  .hero-tags span {
    font-size: 13px; color: #3d4a5c; background: #f5f8fc; border: 1px solid #e4ebf4;
    padding: 6px 13px; border-radius: 6px;
  }
  .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
  .hero-visual { position: relative; }
  .phone-frame {
    border: 1px solid #e2eaf3; border-radius: 22px; background: #fff;
    box-shadow: 0 18px 48px rgba(30, 72, 120, 0.10); padding: 10px; overflow: hidden;
  }
  .phone-frame img { border-radius: 14px; width: 100%; height: auto; }
  .float-card {
    position: absolute; background: #fff; border: 1px solid #e2eaf3; border-radius: 12px;
    box-shadow: 0 10px 26px rgba(30, 72, 120, 0.12); padding: 10px 14px; font-size: 13px; font-weight: 600;
  }
  .float-card.f1 { top: 12px; left: -18px; color: #2e86de; }
  .float-card.f2 { bottom: 18px; right: -14px; color: #1a1a1a; }

  /* section commons */
  section { padding: 64px 0; }
  .section-head { max-width: 720px; margin-bottom: 36px; }
  .section-head .kicker {
    font-size: 13px; font-weight: 700; color: #2e86de; letter-spacing: 1px;
    text-transform: uppercase; margin-bottom: 10px;
  }
  .section-head h2 { font-size: 30px; font-weight: 800; letter-spacing: -0.3px; line-height: 1.3; margin-bottom: 12px; }
  .section-head p { font-size: 15px; color: #5b6675; }
  .alt-bg { background: #f8fbfe; border-top: 1px solid #eef3f9; border-bottom: 1px solid #eef3f9; }

  /* functions */
  .func-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  .func-card {
    background: #fff; border: 1px solid #e7eef6; border-radius: 12px; padding: 22px 18px;
    box-shadow: 0 2px 10px rgba(30, 72, 120, 0.04); transition: transform .2s, box-shadow .2s, border-color .2s;
  }
  .func-card:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(30,72,120,.09); border-color: #cfe5ff; }
  .func-ico {
    width: 38px; height: 38px; border-radius: 9px; background: #eaf4ff; color: #2e86de;
    display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 700; margin-bottom: 14px;
  }
  .func-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
  .func-card p { font-size: 13.5px; color: #5e6b7a; }

  /* z-pattern features */
  .z-row { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; align-items: center; margin-bottom: 46px; }
  .z-row:last-child { margin-bottom: 0; }
  .z-row.reverse .z-text { order: 2; }
  .z-row.reverse .z-pic { order: 1; }
  .z-text h3 { font-size: 22px; font-weight: 800; margin-bottom: 12px; letter-spacing: -0.2px; }
  .z-text p { font-size: 15px; color: #55606e; margin-bottom: 14px; }
  .z-list { list-style: none; }
  .z-list li { font-size: 14px; color: #3d4a5c; padding-left: 20px; position: relative; margin-bottom: 8px; }
  .z-list li::before {
    content: ""; position: absolute; left: 0; top: 9px; width: 7px; height: 7px;
    background: #2e86de; border-radius: 2px;
  }
  .z-pic {
    border-radius: 14px; overflow: hidden; border: 1px solid #e2eaf3; background: #fff;
    box-shadow: 0 10px 30px rgba(30, 72, 120, 0.08);
  }
  .z-pic img { width: 100%; height: 320px; object-fit: cover; }

  /* tags */
  .tag-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
  .tag-item {
    background: #fff; border: 1px solid #e7eef6; border-radius: 10px; padding: 16px 16px;
    display: flex; align-items: center; justify-content: space-between;
    font-size: 15px; font-weight: 600; color: #29343f; transition: all .2s;
  }
  .tag-item span { font-size: 12px; font-weight: 500; color: #8a97a6; background: #f3f7fb; padding: 3px 8px; border-radius: 5px; }
  .tag-item:hover { border-color: #2e86de; color: #2e86de; }
  .tag-item:hover span { background: #eaf4ff; color: #2e86de; }

  /* ranking */
  .rank-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
  .rank-card { background: #fff; border: 1px solid #e7eef6; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 10px rgba(30,72,120,.04); }
  .rank-head { padding: 16px 20px; border-bottom: 1px solid #eef3f9; font-weight: 700; font-size: 16px; display: flex; align-items: center; justify-content: space-between; }
  .rank-head small { font-size: 12px; font-weight: 500; color: #8a97a6; }
  .rank-list { list-style: none; }
  .rank-list li {
    display: flex; align-items: center; gap: 14px; padding: 12px 20px;
    border-bottom: 1px solid #f3f7fb; transition: background .2s;
  }
  .rank-list li:last-child { border-bottom: none; }
  .rank-list li:hover { background: #f8fbfe; }
  .rank-no {
    width: 24px; height: 24px; border-radius: 6px; display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 700; color: #8a97a6; background: #f3f7fb; flex-shrink: 0;
  }
  .rank-list li:nth-child(1) .rank-no { background: #2e86de; color: #fff; }
  .rank-list li:nth-child(2) .rank-no { background: #d6e9ff; color: #2e86de; }
  .rank-list li:nth-child(3) .rank-no { background: #e6f1ff; color: #2e86de; }
  .rank-thumb { width: 40px; height: 52px; border-radius: 5px; object-fit: cover; flex-shrink: 0; }
  .rank-info { flex: 1; min-width: 0; }
  .rank-info b { display: block; font-size: 14px; font-weight: 600; color: #29343f; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .rank-info small { font-size: 12px; color: #8a97a6; }
  .rank-hot { font-size: 12px; color: #2e86de; font-weight: 600; white-space: nowrap; }

  /* screenshots */
  .shot-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
  .shot-item { border-radius: 12px; overflow: hidden; border: 1px solid #e2eaf3; background: #fff; box-shadow: 0 4px 16px rgba(30,72,120,.06); }
  .shot-item img { width: 100%; height: 340px; object-fit: cover; object-position: top; }

  /* feedback */
  .fb-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .fb-card { background: #fff; border: 1px solid #e7eef6; border-radius: 12px; padding: 20px; box-shadow: 0 2px 10px rgba(30,72,120,.04); }
  .fb-top { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
  .fb-top img { width: 34px; height: 34px; border-radius: 50%; object-fit: cover; border: 1px solid #e2eaf3; }
  .fb-top b { font-size: 14px; color: #29343f; display: block; }
  .fb-top small { font-size: 12px; color: #8a97a6; }
  .fb-card p { font-size: 14px; color: #55606e; }

  /* privacy */
  .priv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
  .priv-card { background: #fff; border: 1px solid #e7eef6; border-radius: 12px; padding: 20px 18px; }
  .priv-card b { display: block; font-size: 15px; margin-bottom: 6px; color: #29343f; }
  .priv-card p { font-size: 13.5px; color: #5e6b7a; }

  /* faq */
  .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .faq-item { background: #fff; border: 1px solid #e7eef6; border-radius: 10px; padding: 18px 20px; }
  .faq-item b { display: block; font-size: 15px; color: #29343f; margin-bottom: 8px; }
  .faq-item b::before { content: "Q "; color: #2e86de; font-weight: 800; }
  .faq-item p { font-size: 14px; color: #5e6b7a; }
  .faq-item p::before { content: "A "; color: #8a97a6; font-weight: 700; }

  /* download */
  .download { padding: 64px 0; }
  .dl-box {
    background: #fff; border: 1px solid #e2eaf3; border-radius: 18px;
    box-shadow: 0 16px 44px rgba(30,72,120,.09);
    padding: 44px; display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 36px; align-items: center;
  }
  .dl-box h2 { font-size: 28px; font-weight: 800; letter-spacing: -0.3px; margin-bottom: 12px; }
  .dl-box > div > p { font-size: 15px; color: #55606e; margin-bottom: 22px; }
  .dl-btns { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
  .steps { list-style: none; display: grid; gap: 10px; }
  .steps li { font-size: 14px; color: #3d4a5c; display: flex; gap: 10px; align-items: flex-start; }
  .steps li em {
    font-style: normal; width: 20px; height: 20px; border-radius: 50%; background: #eaf4ff; color: #2e86de;
    font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px;
  }
  .qr-card { text-align: center; background: #f8fbfe; border: 1px dashed #cfe0f2; border-radius: 14px; padding: 22px; }
  .qr-card img { width: 100%; max-width: 180px; margin: 0 auto 12px; border-radius: 8px; }
  .qr-card p { font-size: 13px; color: #5e6b7a; }

  /* footer */
  .site-footer { background: #101822; color: #c3ccd8; padding: 44px 0 28px; }
  .footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; padding-bottom: 30px; border-bottom: 1px solid rgba(255,255,255,.09); }
  .footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; font-size: 17px; font-weight: 700; color: #fff; }
  .footer-brand img { height: 30px; width: auto; border-radius: 6px; }
  .footer-col p { font-size: 13.5px; color: #9aa6b5; line-height: 1.8; }
  .footer-col h4 { font-size: 14px; color: #fff; margin-bottom: 12px; font-weight: 700; }
  .footer-col a { display: block; font-size: 13.5px; color: #9aa6b5; margin-bottom: 8px; transition: color .2s; }
  .footer-col a:hover { color: #6fb3ff; }
  .footer-bottom { padding-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; align-items: center; }
  .footer-bottom p { font-size: 12.5px; color: #7e8b9b; }
  .footer-bottom time { font-size: 12.5px; color: #7e8b9b; }

  /* modal */
  .copy-modal {
    position: fixed; inset: 0; z-index: 200; display: none;
    background: rgba(16, 24, 34, .5); align-items: center; justify-content: center; padding: 20px;
  }
  .copy-modal.open { display: flex; }
  .copy-panel {
    background: #fff; border-radius: 14px; max-width: 420px; width: 100%; padding: 26px;
    box-shadow: 0 24px 60px rgba(0,0,0,.24); text-align: center;
  }
  .copy-panel strong { display: block; font-size: 15px; color: #1a1a1a; margin-bottom: 16px; line-height: 1.6; }
  .copy-link {
    background: #f3f7fb; border: 1px solid #e2eaf3; border-radius: 8px; padding: 12px;
    font-size: 13px; color: #2e86de; word-break: break-all; margin-bottom: 16px;
  }
  .copy-panel .btn { width: 100%; margin-bottom: 10px; }
  .copy-close { background: none; border: none; color: #8a97a6; font-size: 14px; cursor: pointer; font-family: inherit; }

  /* responsive */
  @media (max-width: 1024px) {
    .hero h1 { font-size: 36px; }
    .func-grid { grid-template-columns: repeat(3, 1fr); }
    .tag-grid { grid-template-columns: repeat(3, 1fr); }
    .priv-grid { grid-template-columns: repeat(2, 1fr); }
    .shot-strip { grid-template-columns: repeat(3, 1fr); }
    .shot-item img { height: 300px; }
    .fb-grid { grid-template-columns: repeat(2, 1fr); }
    .dl-box { padding: 34px; }
    .footer-top { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 768px) {
    .header-inner { height: 58px; }
    .menu-toggle { display: block; }
    .nav {
      display: none; position: absolute; top: 58px; left: 0; right: 0;
      background: #fff; flex-direction: column; align-items: stretch; gap: 0;
      border-bottom: 1px solid #edf2f7; padding: 8px 0; box-shadow: 0 12px 24px rgba(30,72,120,.08);
      max-height: 70vh; overflow-y: auto;
    }
    .nav.open { display: flex; }
    .nav a { padding: 12px 22px; border-radius: 0; }
    .hero { padding: 36px 0 40px; }
    .hero-grid { grid-template-columns: 1fr; gap: 34px; }
    .hero h1 { font-size: 29px; }
    .hero p.lead { font-size: 15px; }
    .float-card.f1 { left: 4px; }
    .float-card.f2 { right: 4px; }
    .z-row, .z-row.reverse { grid-template-columns: 1fr; gap: 22px; margin-bottom: 32px; }
    .z-row.reverse .z-text { order: 1; }
    .z-row.reverse .z-pic { order: 2; }
    .z-pic img { height: 220px; }
    .section-head h2 { font-size: 23px; }
    section { padding: 46px 0; }
    .func-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .tag-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .rank-wrap { grid-template-columns: 1fr; }
    .shot-strip { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .shot-item img { height: 260px; }
    .fb-grid { grid-template-columns: 1fr; }
    .priv-grid { grid-template-columns: 1fr; }
    .faq-list { grid-template-columns: 1fr; }
    .download { padding: 46px 0; }
    .dl-box { grid-template-columns: 1fr; padding: 26px 20px; gap: 26px; }
    .dl-box h2 { font-size: 23px; }
    .footer-top { grid-template-columns: 1fr; gap: 22px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
  }
  @media (max-width: 420px) {
    .func-grid { grid-template-columns: 1fr; }
    .tag-grid { grid-template-columns: 1fr 1fr; }
    .shot-strip { grid-template-columns: 1fr 1fr; }
    .shot-item img { height: 230px; }
  }