:root {
  --ba_ink: #0b0e11;
  --ba_ink_soft: #181c20;
  --ba_yellow: #f0b90b;
  --ba_yellow_dark: #c99800;
  --ba_paper: #f5f6f7;
  --ba_white: #ffffff;
  --ba_line: #e3e6e8;
  --ba_text: #20252b;
  --ba_muted: #66707a;
  --ba_ok: #147d58;
  --ba_radius: 18px;
  --ba_shadow: 0 22px 60px rgba(0, 0, 0, .13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 78px; }
body {
  margin: 0;
  color: var(--ba_text);
  background: var(--ba_paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
code { font-family: "SFMono-Regular", Consolas, monospace; font-size: .92em; }
.ba_shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.ba_sr_only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.ba_skip {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  transform: translateY(-140%);
  padding: 10px 16px;
  color: var(--ba_ink);
  background: var(--ba_yellow);
  border-radius: 8px;
  font-weight: 700;
}
.ba_skip:focus { transform: translateY(0); }

.ba_header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: #fff;
  background: rgba(11, 14, 17, .94);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  backdrop-filter: blur(14px);
}
.ba_header_inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.ba_brand { display: inline-flex; align-items: center; gap: 12px; line-height: 1.2; }
.ba_brand_mark, .ba_app_icon {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--ba_ink);
  background: var(--ba_yellow);
  font-weight: 900;
  letter-spacing: -.04em;
}
.ba_brand_mark { width: 38px; height: 38px; border-radius: 10px; }
.ba_brand strong { display: block; font-size: .96rem; }
.ba_brand small { display: block; margin-top: 3px; color: #9fa8b0; font-size: .75rem; }
.ba_nav { display: flex; align-items: center; gap: 26px; font-size: .9rem; }
.ba_nav a { color: #cfd4d8; transition: color .2s ease; }
.ba_nav a:hover, .ba_nav a:focus-visible { color: #fff; }
.ba_nav .ba_nav_cta { padding: 9px 15px; color: var(--ba_ink); background: var(--ba_yellow); border-radius: 8px; font-weight: 750; }
.ba_menu_btn { display: none; width: 44px; height: 44px; padding: 10px; background: transparent; border: 0; cursor: pointer; }
.ba_menu_btn > span:not(.ba_sr_only) { display: block; height: 2px; margin: 5px 0; background: #fff; border-radius: 2px; }

.ba_hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 650px;
  color: #fff;
  background:
    radial-gradient(circle at 83% 24%, rgba(240, 185, 11, .17), transparent 26%),
    radial-gradient(circle at 10% 100%, rgba(240, 185, 11, .08), transparent 30%),
    var(--ba_ink);
}
.ba_hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 5px;
  z-index: -1;
  background: linear-gradient(90deg, var(--ba_yellow) 0 22%, transparent 22% 100%);
}
.ba_hero_grid {
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: .35;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, #000, transparent 90%);
}
.ba_breadcrumb { display: flex; align-items: center; gap: 10px; padding-top: 24px; color: #9099a1; font-size: .82rem; }
.ba_breadcrumb a:hover { color: var(--ba_yellow); }
.ba_hero_layout { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(360px, .72fr); gap: 76px; align-items: center; padding: 74px 0 92px; }
.ba_eyebrow, .ba_kicker { margin: 0 0 13px; color: var(--ba_yellow_dark); font-size: .79rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.ba_eyebrow { display: flex; align-items: center; color: var(--ba_yellow); }
.ba_eyebrow span { width: 28px; height: 1px; margin-right: 10px; background: currentColor; }
.ba_hero h1 { max-width: 720px; margin: 0; font-size: clamp(2.4rem, 4.7vw, 4.45rem); line-height: 1.1; letter-spacing: -.045em; }
.ba_lead { max-width: 700px; margin: 26px 0 0; color: #b9c0c6; font-size: 1.06rem; line-height: 1.9; }
.ba_keyword_row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 26px; }
.ba_keyword_row span { padding: 6px 11px; color: #d9dde0; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.11); border-radius: 999px; font-size: .78rem; }
.ba_hero_actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 31px; }
.ba_btn { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; padding: 0 20px; border: 1px solid transparent; border-radius: 9px; font-weight: 750; }
.ba_btn_primary { color: var(--ba_ink); background: var(--ba_yellow); }
.ba_btn_primary:hover { background: #ffd33d; }
.ba_btn_ghost { color: #fff; border-color: #3c4248; }
.ba_btn_ghost:hover { border-color: #7c848b; }
.ba_source { max-width: 680px; margin: 22px 0 0; color: #7f8992; font-size: .78rem; }
.ba_source a { color: #bdc4ca; text-decoration: underline; text-underline-offset: 3px; }

.ba_download_card { position: relative; padding: 28px; color: var(--ba_text); background: #fff; border-radius: 22px; box-shadow: var(--ba_shadow); }
.ba_download_card::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--ba_yellow); border-radius: 22px 22px 0 0; }
.ba_card_topline { display: flex; align-items: center; justify-content: space-between; gap: 14px; color: var(--ba_muted); font-size: .72rem; font-weight: 800; letter-spacing: .08em; }
.ba_os_tag { display: inline-flex; align-items: center; gap: 7px; color: #31373d; }
.ba_os_tag i { width: 8px; height: 8px; background: var(--ba_ok); border-radius: 50%; box-shadow: 0 0 0 4px rgba(20,125,88,.1); }
.ba_checked { color: var(--ba_ok); }
.ba_app_identity { display: flex; align-items: center; gap: 17px; margin: 24px 0; }
.ba_app_icon { width: 64px; height: 64px; border-radius: 16px; font-size: 1.75rem; }
.ba_app_identity h2 { margin: 0; color: var(--ba_ink); font-size: 1.45rem; line-height: 1.25; }
.ba_app_identity p { margin: 4px 0 0; color: var(--ba_muted); font-size: .88rem; }
.ba_meta_grid { display: grid; grid-template-columns: 1fr 1fr; margin: 0 0 22px; border: 1px solid var(--ba_line); border-radius: 12px; overflow: hidden; }
.ba_meta_grid div { padding: 13px 14px; }
.ba_meta_grid div:nth-child(odd) { border-right: 1px solid var(--ba_line); }
.ba_meta_grid div:nth-child(-n+2) { border-bottom: 1px solid var(--ba_line); }
.ba_meta_grid dt { color: var(--ba_muted); font-size: .7rem; }
.ba_meta_grid dd { margin: 2px 0 0; color: var(--ba_ink); font-size: .92rem; font-weight: 750; }
.ba_download_btn { display: flex; min-height: 55px; align-items: center; justify-content: space-between; padding: 0 18px; color: var(--ba_ink); background: var(--ba_yellow); border-radius: 10px; font-weight: 850; }
.ba_download_btn:hover { background: #ffd33d; }
.ba_download_btn span { font-size: 1.2rem; }
.ba_download_hint, .ba_independent { margin: 12px 0 0; color: var(--ba_muted); font-size: .74rem; line-height: 1.6; }
.ba_download_hint code { color: #30363b; }
.ba_card_rule { height: 1px; margin: 20px 0 16px; background: var(--ba_line); }

.ba_anchor_bar { color: #fff; background: var(--ba_ink_soft); border-bottom: 1px solid #2b3035; }
.ba_anchor_inner { min-height: 64px; display: flex; align-items: center; gap: 30px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.ba_anchor_inner::-webkit-scrollbar { display: none; }
.ba_anchor_inner strong { color: var(--ba_yellow); font-size: .8rem; }
.ba_anchor_inner a { color: #aeb6bd; font-size: .86rem; }
.ba_anchor_inner a:hover { color: #fff; }

.ba_content { overflow: hidden; }
.ba_section { padding: 92px 0; background: var(--ba_white); scroll-margin-top: 76px; }
.ba_section_alt { background: var(--ba_paper); }
.ba_two_col { display: grid; grid-template-columns: .78fr 1.22fr; gap: 88px; align-items: start; }
.ba_section_intro h2, .ba_heading_row h2, .ba_text_layout h2, .ba_faq_intro h2, .ba_update_box h2 { margin: 0; color: var(--ba_ink); font-size: clamp(1.85rem, 3vw, 2.55rem); line-height: 1.28; letter-spacing: -.035em; }
.ba_section_intro > p:last-child, .ba_heading_row > p, .ba_faq_intro > p { margin: 20px 0 0; color: var(--ba_muted); }
.ba_info_panel { background: #fff; border: 1px solid var(--ba_line); border-radius: var(--ba_radius); box-shadow: 0 14px 40px rgba(21,29,36,.06); overflow: hidden; }
.ba_info_panel table { width: 100%; border-collapse: collapse; }
.ba_info_panel tr:not(:last-child) { border-bottom: 1px solid var(--ba_line); }
.ba_info_panel th, .ba_info_panel td { padding: 15px 20px; text-align: left; vertical-align: top; }
.ba_info_panel th { width: 32%; color: var(--ba_muted); background: #fafbfb; font-size: .84rem; font-weight: 650; }
.ba_info_panel td { color: #242a30; font-size: .92rem; }
.ba_product_visual { margin: 48px 0 0; background: var(--ba_ink); border: 1px solid #252a2f; border-radius: 20px; box-shadow: 0 18px 48px rgba(14,18,22,.12); overflow: hidden; }
.ba_product_visual img { display: block; width: 100%; height: clamp(300px, 48vw, 560px); object-fit: cover; object-position: center; }
.ba_product_visual figcaption { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 0; padding: 15px 19px; color: #858f97; font-size: .78rem; }
.ba_product_visual figcaption strong { color: #fff; font-size: .86rem; }
.ba_heading_row { display: grid; grid-template-columns: 1fr minmax(280px, 470px); gap: 50px; align-items: end; margin-bottom: 38px; }
.ba_heading_row > p { margin: 0; }
.ba_check_grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 0; padding: 0; list-style: none; }
.ba_check_grid li { min-height: 255px; padding: 24px; background: #fff; border: 1px solid var(--ba_line); border-radius: 15px; }
.ba_check_grid span, .ba_feature_grid span { color: var(--ba_yellow_dark); font-family: Georgia, serif; font-size: 1rem; font-weight: 700; }
.ba_check_grid h3, .ba_feature_grid h3, .ba_steps h3 { margin: 48px 0 8px; color: var(--ba_ink); font-size: 1.02rem; line-height: 1.4; }
.ba_check_grid p, .ba_feature_grid p, .ba_steps p { margin: 0; color: var(--ba_muted); font-size: .88rem; }
.ba_warning { margin-top: 18px; padding: 18px 22px; color: #604c07; background: #fff9df; border-left: 4px solid var(--ba_yellow); border-radius: 6px 12px 12px 6px; font-size: .9rem; }

.ba_steps { display: grid; grid-template-columns: 1fr 1fr; gap: 0 66px; margin: 0; padding: 0; list-style: none; counter-reset: item; }
.ba_steps li { display: grid; grid-template-columns: 48px 1fr; gap: 18px; padding: 27px 0; border-top: 1px solid var(--ba_line); }
.ba_step_no { display: grid; width: 42px; height: 42px; place-items: center; color: var(--ba_ink); background: var(--ba_yellow); border-radius: 50%; font-size: .88rem; font-weight: 850; }
.ba_steps h3 { margin: 0 0 6px; }

.ba_feature_section { color: #fff; background: var(--ba_ink); }
.ba_heading_light h2 { color: #fff; }
.ba_heading_light > p { color: #9ca5ad; }
.ba_feature_grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #343a40; border-left: 1px solid #343a40; }
.ba_feature_grid section { min-height: 230px; padding: 27px; border-right: 1px solid #343a40; border-bottom: 1px solid #343a40; }
.ba_feature_grid h3 { margin-top: 52px; color: #fff; }
.ba_feature_grid p { color: #9fa8b0; }

.ba_text_layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 92px; }
.ba_prose { max-width: 700px; color: #515a63; }
.ba_prose p { margin: 0 0 18px; }
.ba_faq_layout { display: grid; grid-template-columns: minmax(220px, .52fr) minmax(0, 1fr); gap: 80px; align-items: start; }
.ba_faq_intro { position: sticky; top: 105px; }
.ba_faq_intro a { display: inline-block; margin-top: 24px; color: #655000; border-bottom: 1px solid #b8950f; font-size: .87rem; font-weight: 750; }
.ba_faq_list { border-top: 1px solid #cfd4d7; }
.ba_faq_list details { border-bottom: 1px solid #cfd4d7; }
.ba_faq_list summary { position: relative; padding: 22px 46px 22px 0; color: var(--ba_ink); cursor: pointer; list-style: none; font-weight: 750; }
.ba_faq_list summary::-webkit-details-marker { display: none; }
.ba_faq_list summary::after { content: "+"; position: absolute; top: 19px; right: 4px; width: 28px; height: 28px; display: grid; place-items: center; color: #4d555c; border: 1px solid #cfd4d7; border-radius: 50%; font-size: 1.1rem; font-weight: 400; }
.ba_faq_list details[open] summary::after { content: "−"; color: var(--ba_ink); background: var(--ba_yellow); border-color: var(--ba_yellow); }
.ba_faq_list details p { margin: -4px 46px 23px 0; color: var(--ba_muted); font-size: .93rem; }

.ba_update_box { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; padding: 34px; background: #fff; border: 1px solid var(--ba_line); border-radius: var(--ba_radius); }
.ba_update_item { display: grid; grid-template-columns: 130px 1fr; gap: 24px; align-items: start; padding-top: 7px; }
.ba_update_item time { color: var(--ba_yellow_dark); font-size: .85rem; font-weight: 800; }
.ba_update_item p { margin: 0; color: var(--ba_muted); }
.ba_risk { padding: 29px 0; color: #bdc4ca; background: #171b1f; border-top: 1px solid #292f34; }
.ba_risk .ba_shell { display: grid; grid-template-columns: 120px 1fr; gap: 24px; }
.ba_risk strong { color: var(--ba_yellow); }
.ba_risk p { margin: 0; font-size: .84rem; }

.ba_footer { padding: 48px 0 36px; color: #c6ccd1; background: var(--ba_ink); }
.ba_footer_inner { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: start; }
.ba_footer strong { color: #fff; }
.ba_footer p { margin: 7px 0 0; color: #78828a; font-size: .8rem; }
.ba_footer_links { display: flex; flex-wrap: wrap; gap: 24px; font-size: .83rem; }
.ba_footer_links a:hover { color: var(--ba_yellow); }
.ba_copyright { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid #282d32; }
.ba_mobile_bar { display: none; }

:focus-visible { outline: 3px solid #ffd43b; outline-offset: 3px; }

@media (max-width: 980px) {
  .ba_hero_layout { grid-template-columns: 1fr .82fr; gap: 38px; }
  .ba_hero h1 { font-size: clamp(2.3rem, 5vw, 3.55rem); }
  .ba_check_grid { grid-template-columns: 1fr 1fr; }
  .ba_check_grid li { min-height: 220px; }
  .ba_feature_grid { grid-template-columns: 1fr 1fr; }
  .ba_two_col, .ba_text_layout { gap: 50px; }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 66px; }
  body { padding-bottom: calc(72px + env(safe-area-inset-bottom)); }
  .ba_shell { width: min(100% - 28px, 620px); }
  .ba_header_inner { min-height: 62px; }
  .ba_brand_mark { width: 34px; height: 34px; }
  .ba_menu_btn { display: block; }
  .ba_nav {
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    display: none;
    align-items: stretch;
    gap: 0;
    padding: 10px 14px 18px;
    background: #101418;
    border-top: 1px solid #292f34;
    box-shadow: 0 16px 30px rgba(0,0,0,.25);
  }
  .ba_nav.ba_open { display: grid; }
  .ba_nav a { min-height: 48px; display: flex; align-items: center; padding: 0 12px; border-bottom: 1px solid #262c31; }
  .ba_nav .ba_nav_cta { justify-content: center; margin-top: 10px; border: 0; }
  .ba_breadcrumb { padding-top: 18px; }
  .ba_hero { min-height: auto; }
  .ba_hero_layout { grid-template-columns: 1fr; gap: 42px; padding: 45px 0 64px; }
  .ba_hero h1 { font-size: clamp(2.15rem, 10.6vw, 3.15rem); }
  .ba_lead { margin-top: 20px; font-size: 1rem; }
  .ba_hero_actions { display: grid; grid-template-columns: 1fr; }
  .ba_btn { width: 100%; }
  .ba_download_card { padding: 23px 20px; border-radius: 17px; }
  .ba_anchor_inner { min-height: 57px; gap: 22px; }
  .ba_section { padding: 67px 0; }
  .ba_two_col, .ba_heading_row, .ba_text_layout, .ba_faq_layout, .ba_update_box { grid-template-columns: 1fr; gap: 30px; }
  .ba_heading_row { align-items: start; margin-bottom: 30px; }
  .ba_info_panel { overflow-x: auto; }
  .ba_info_panel th, .ba_info_panel td { padding: 14px 13px; }
  .ba_info_panel th { width: 36%; }
  .ba_product_visual { margin-top: 34px; border-radius: 15px; }
  .ba_product_visual img { height: 290px; }
  .ba_product_visual figcaption { display: grid; gap: 3px; }
  .ba_check_grid, .ba_steps, .ba_feature_grid { grid-template-columns: 1fr; }
  .ba_check_grid li { min-height: auto; }
  .ba_check_grid h3, .ba_feature_grid h3 { margin-top: 34px; }
  .ba_feature_grid { border-left: 0; }
  .ba_feature_grid section { min-height: auto; border-left: 1px solid #343a40; }
  .ba_faq_intro { position: static; }
  .ba_update_box { padding: 25px 20px; }
  .ba_update_item { grid-template-columns: 1fr; gap: 8px; }
  .ba_risk .ba_shell { grid-template-columns: 1fr; gap: 8px; }
  .ba_footer { padding-bottom: 40px; }
  .ba_footer_inner { grid-template-columns: 1fr; }
  .ba_footer_links { gap: 17px; }
  .ba_mobile_bar {
    position: fixed;
    z-index: 90;
    inset: auto 0 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70px;
    padding: 8px 14px calc(8px + env(safe-area-inset-bottom));
    color: #fff;
    background: rgba(11,14,17,.96);
    border-top: 1px solid #333940;
    backdrop-filter: blur(12px);
  }
  .ba_mobile_bar strong, .ba_mobile_bar small { display: block; line-height: 1.35; }
  .ba_mobile_bar strong { font-size: .86rem; }
  .ba_mobile_bar small { color: #8f99a2; font-size: .7rem; }
  .ba_mobile_bar a { min-height: 46px; display: inline-flex; align-items: center; padding: 0 19px; color: var(--ba_ink); background: var(--ba_yellow); border-radius: 8px; font-size: .86rem; font-weight: 850; }
}

@media (max-width: 390px) {
  .ba_meta_grid { grid-template-columns: 1fr; }
  .ba_meta_grid div:nth-child(odd) { border-right: 0; }
  .ba_meta_grid div:not(:last-child) { border-bottom: 1px solid var(--ba_line); }
  .ba_card_topline { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}