:root{
  --bf-deep-900:#071A2B;
  --bf-deep-700:#0E2F4A;
  --bf-cyan-500:#2BE3C6;
  --bf-coral-500:#FF6B4A;
  --bf-cream-100:#F4EBDD;
  --bf-rock-400:#8A9AA8;
  --bf-moss-500:#5F8C6A;
  --bf-clay-500:#B96B4B;
  --bf-ice-50:#E8F7F6;
  --bf-midnight-950:#030B12;

  --bf-font-display:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --bf-font-body:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --bf-font-mono:"JetBrains Mono","Roboto Mono","SFMono-Regular",ui-monospace,Consolas,"Liberation Mono",monospace;

  --bf-gutter:clamp(1rem,4vw,2.5rem);
  --bf-max:1240px;
  --bf-radius:16px;
  --bf-line:rgba(138,154,168,.22);
  --bf-line-cyan:rgba(43,227,198,.24);
  --bf-ease:180ms cubic-bezier(.4,0,.2,1);
}

*,*::before,*::after{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth;}
}

body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,canvas{display:block;max-width:100%;}
button{font:inherit;color:inherit;}
h1,h2,h3,h4,h5{font-family:var(--bf-font-display);font-weight:800;line-height:1.2;letter-spacing:-.01em;}

body{
  min-height:100vh;
  font-family:var(--bf-font-body);
  font-size:16px;
  line-height:1.7;
  color:var(--bf-cream-100);
  background-color:var(--bf-deep-900);
  background-image:
    repeating-linear-gradient(90deg,rgba(138,154,168,.055) 0 1px,transparent 1px 72px),
    repeating-linear-gradient(0deg,rgba(138,154,168,.04) 0 1px,transparent 1px 72px),
    radial-gradient(1200px 700px at 84% -12%,rgba(43,227,198,.13),transparent 62%),
    radial-gradient(920px 640px at 2% 104%,rgba(255,107,74,.09),transparent 60%),
    linear-gradient(168deg,#071A2B 0%,#0A2237 44%,#04101B 100%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
}

#main-content{scroll-margin-top:112px;}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--bf-cyan-500);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- utilities ---------- */
.bf-wrap{
  width:min(var(--bf-max),calc(100% - var(--bf-gutter) * 2));
  margin-inline:auto;
}
.bf-main{display:block;}
.bf-section{padding-block:clamp(2.25rem,5vw,4rem);}
.bf-flow > * + *{margin-top:1rem;}
.bf-mono{
  font-family:var(--bf-font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.bf-sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.bf-eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--bf-font-mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--bf-cyan-500);
}
.bf-eyebrow::before{
  content:"";width:22px;height:1px;background:var(--bf-cyan-500);opacity:.7;
}

/* ---------- skip link ---------- */
.bf-skip{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:.72rem 1.15rem;
  border-radius:999px;
  background:var(--bf-cyan-500);
  color:#04202B;
  font-size:14px;font-weight:700;text-decoration:none;
  transform:translateY(-180%);
  transition:transform var(--bf-ease);
}
.bf-skip:focus,
.bf-skip:focus-visible{transform:translateY(0);}

/* ---------- header ---------- */
.bf-header{
  position:sticky;top:0;z-index:80;
  padding-block:14px;
  transition:padding var(--bf-ease);
}
.bf-header::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(180deg,rgba(4,16,27,.94) 0%,rgba(4,16,27,.70) 58%,rgba(4,16,27,0) 100%);
  transition:background var(--bf-ease),box-shadow var(--bf-ease);
}
.bf-header.is-condensed{padding-block:8px;}
.bf-header.is-condensed::before{
  background:linear-gradient(180deg,rgba(3,11,18,.98) 0%,rgba(10,34,55,.94) 100%);
  box-shadow:0 18px 44px -34px #000;
}

.bf-header__inner{
  width:min(var(--bf-max),calc(100% - var(--bf-gutter) * 2));
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:10px;
}

.bf-pill{
  background:rgba(14,47,74,.80);
  border:1px solid var(--bf-line-cyan);
  border-radius:999px;
  color:var(--bf-ice-50);
  box-shadow:0 20px 44px -34px #000;
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

/* brand island */
.bf-brand{
  display:inline-flex;align-items:center;gap:10px;
  flex:0 0 auto;
  padding:7px 18px 7px 9px;
  text-decoration:none;
  color:inherit;
  transition:border-color var(--bf-ease),box-shadow var(--bf-ease);
}
.bf-brand:hover{
  border-color:rgba(43,227,198,.58);
  box-shadow:0 0 0 1px rgba(43,227,198,.20),0 20px 44px -34px #000;
}
.bf-brand__mark{
  position:relative;
  width:30px;height:30px;flex:0 0 auto;
  display:grid;place-items:center;
  border-radius:50%;
  border:1px solid rgba(43,227,198,.6);
  background:radial-gradient(circle at 34% 28%,#2BE3C6 0%,#0E2F4A 76%);
}
.bf-brand__dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--bf-midnight-950);
  box-shadow:0 0 0 3px rgba(7,26,43,.55);
}
.bf-brand__text{display:flex;flex-direction:column;line-height:1.18;}
.bf-brand__name{
  font-family:var(--bf-font-display);
  font-weight:800;font-size:16.5px;letter-spacing:.06em;
  color:var(--bf-ice-50);
}
.bf-brand__tag{
  font-family:var(--bf-font-mono);
  font-size:10.5px;letter-spacing:.09em;
  color:var(--bf-rock-400);
}

/* nav island */
.bf-nav{
  margin-inline:auto;
  padding:5px;
  min-width:0;
}
.bf-nav__list{display:flex;align-items:center;gap:2px;}
.bf-nav__link{
  display:block;
  padding:8px 14px;
  border-radius:999px;
  font-size:13.5px;letter-spacing:.02em;
  color:var(--bf-cream-100);
  text-decoration:none;
  white-space:nowrap;
  transition:color var(--bf-ease),background-color var(--bf-ease);
}
.bf-nav__link:hover{
  color:var(--bf-cyan-500);
  background:rgba(43,227,198,.10);
}
.bf-nav__link[aria-current="page"]{
  background:var(--bf-cyan-500);
  color:#04202B;
  font-weight:700;
  box-shadow:0 0 0 1px rgba(43,227,198,.55);
}

/* tool island */
.bf-header__tools{
  display:flex;align-items:center;gap:8px;
  flex:0 0 auto;
  margin-left:auto;
}
.bf-version{
  padding:8px 14px;
  font-size:11.5px;
  color:var(--bf-cyan-500);
}

/* buttons */
.bf-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.72rem 1.15rem;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--bf-font-body);
  font-size:14px;font-weight:600;line-height:1;
  text-align:center;text-decoration:none;
  cursor:pointer;
  transition:background-color var(--bf-ease),color var(--bf-ease),border-color var(--bf-ease),transform var(--bf-ease),box-shadow var(--bf-ease);
}
.bf-btn--sm{padding:.6rem .95rem;font-size:13px;}
.bf-btn--accent{
  background:var(--bf-coral-500);
  color:#2A0C03;
  border-color:rgba(255,107,74,.7);
}
.bf-btn--accent:hover{
  background:#FF8467;
  transform:translateY(-1px);
  box-shadow:0 12px 26px -16px rgba(255,107,74,.95);
}
.bf-btn--ghost{
  background:transparent;
  color:var(--bf-ice-50);
  border-color:rgba(43,227,198,.36);
}
.bf-btn--ghost:hover{
  color:var(--bf-cyan-500);
  border-color:var(--bf-cyan-500);
  background:rgba(43,227,198,.08);
}
.bf-btn--primary{
  background:var(--bf-cyan-500);
  color:#04202B;
  border-color:rgba(43,227,198,.8);
}
.bf-btn--primary:hover{background:#5BF0D9;transform:translateY(-1px);}

/* nav toggle */
.bf-nav-toggle{
  display:none;
  position:relative;
  width:42px;height:42px;padding:0;
  border-radius:999px;
  border:1px solid rgba(43,227,198,.34);
  background:rgba(14,47,74,.86);
  cursor:pointer;
  transition:border-color var(--bf-ease),background-color var(--bf-ease);
}
.bf-nav-toggle::before,
.bf-nav-toggle::after{
  content:"";position:absolute;left:50%;
  width:16px;height:1.5px;border-radius:2px;
  background:var(--bf-ice-50);
  transition:transform var(--bf-ease);
}
.bf-nav-toggle::before{top:calc(50% - 4px);transform:translateX(-50%);}
.bf-nav-toggle::after{top:calc(50% + 4px);transform:translateX(-50%);}
.bf-nav-toggle:hover{border-color:var(--bf-cyan-500);background:rgba(43,227,198,.14);}
.bf-header[data-open] .bf-nav-toggle{border-color:var(--bf-cyan-500);}
.bf-header[data-open] .bf-nav-toggle::before{transform:translateX(-50%) translateY(4px) rotate(45deg);}
.bf-header[data-open] .bf-nav-toggle::after{transform:translateX(-50%) translateY(-4px) rotate(-45deg);}

/* ---------- footer ---------- */
.bf-footer{
  position:relative;
  margin-top:clamp(3.5rem,8vw,7rem);
  overflow:hidden;
  background:linear-gradient(180deg,#04101B 0%,#030B12 100%);
  border-top:1px solid var(--bf-line-cyan);
}
.bf-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    repeating-linear-gradient(115deg,rgba(43,227,198,.05) 0 1px,transparent 1px 22px),
    radial-gradient(760px 340px at 10% 0%,rgba(43,227,198,.12),transparent 66%),
    radial-gradient(600px 320px at 90% 18%,rgba(255,107,74,.08),transparent 66%);
}
.bf-footer__inner{
  position:relative;
  padding-block:clamp(2.5rem,6vw,4.5rem) 1.6rem;
}
.bf-footer__mast{
  display:flex;flex-wrap:wrap;
  align-items:flex-end;justify-content:space-between;
  gap:1rem 2.5rem;
  padding-bottom:1.8rem;
  border-bottom:1px solid var(--bf-line);
}
.bf-footer__brand{
  font-family:var(--bf-font-display);
  font-weight:900;
  font-size:clamp(2.6rem,6.5vw,4.25rem);
  line-height:.92;
  letter-spacing:-.02em;
  color:var(--bf-cream-100);
}
.bf-footer__summary{
  max-width:36ch;
  font-size:14px;line-height:1.8;
  color:var(--bf-rock-400);
}
.bf-footer__grid{
  display:grid;
  gap:2rem;
  grid-template-columns:1fr;
  padding-block:2rem;
}
.bf-footer__heading{
  display:flex;align-items:center;gap:.6rem;
  margin-bottom:1rem;
  font-family:var(--bf-font-body);
  font-size:12.5px;font-weight:700;letter-spacing:.16em;
  color:var(--bf-cyan-500);
}
.bf-footer__idx{
  font-family:var(--bf-font-mono);
  font-size:11px;letter-spacing:.1em;
  color:var(--bf-rock-400);
}
.bf-footer__links{display:grid;gap:.6rem;}
.bf-footer__links a{
  position:relative;
  display:inline-block;
  padding-bottom:2px;
  font-size:14.5px;
  color:var(--bf-cream-100);
  text-decoration:none;
  transition:color var(--bf-ease);
}
.bf-footer__links a::after{
  content:"";position:absolute;left:0;bottom:0;
  width:0;height:1px;
  background:var(--bf-cyan-500);
  transition:width var(--bf-ease);
}
.bf-footer__links a:hover{color:var(--bf-cyan-500);}
.bf-footer__links a:hover::after{width:100%;}
.bf-footer__contact{display:grid;gap:.65rem;font-size:14px;color:var(--bf-ice-50);}
.bf-footer__contact li{display:flex;gap:.65rem;line-height:1.7;}
.bf-footer__label{
  flex:0 0 2.6em;
  padding-top:.32em;
  font-family:var(--bf-font-mono);
  font-size:10.5px;letter-spacing:.12em;
  color:var(--bf-rock-400);
}
.bf-footer__note{
  margin-top:1rem;
  padding-top:.9rem;
  border-top:1px dashed rgba(138,154,168,.28);
  font-size:12.5px;line-height:1.75;
  color:var(--bf-rock-400);
}
.bf-footer__base{
  display:flex;flex-wrap:wrap;
  align-items:center;justify-content:space-between;
  gap:.9rem 1.5rem;
  padding-top:1.5rem;
  border-top:1px solid var(--bf-line);
}
.bf-footer__copy{
  font-family:var(--bf-font-mono);
  font-size:12px;letter-spacing:.05em;
  color:var(--bf-rock-400);
}
.bf-footer__legal{display:flex;flex-wrap:wrap;gap:1.25rem;}
.bf-footer__legal a{
  font-family:var(--bf-font-mono);
  font-size:12px;letter-spacing:.05em;
  color:var(--bf-rock-400);
  text-decoration:none;
  transition:color var(--bf-ease);
}
.bf-footer__legal a:hover{color:var(--bf-cyan-500);}

/* ---------- shared page components ---------- */
.bf-crumbs{
  padding-block:.5rem 0;
  font-size:12.5px;
  color:var(--bf-rock-400);
}
.bf-crumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  font-family:var(--bf-font-mono);
  letter-spacing:.04em;
}
.bf-crumbs__list li{display:flex;align-items:center;gap:.5rem;}
.bf-crumbs__list li::after{content:"/";color:rgba(138,154,168,.45);}
.bf-crumbs__list li:last-child::after{content:"";}
.bf-crumbs a{
  color:var(--bf-rock-400);
  text-decoration:none;
  transition:color var(--bf-ease);
}
.bf-crumbs a:hover{color:var(--bf-cyan-500);}
.bf-crumbs [aria-current="page"]{color:var(--bf-cream-100);}

.bf-secnum{
  display:flex;align-items:baseline;gap:.75rem;
  margin-bottom:1.25rem;
}
.bf-secnum__index{
  flex:0 0 auto;
  padding:.22rem .55rem;
  border:1px solid rgba(43,227,198,.34);
  border-radius:4px;
  font-family:var(--bf-font-mono);
  font-size:11.5px;letter-spacing:.18em;
  color:var(--bf-cyan-500);
}
.bf-secnum__title{
  font-family:var(--bf-font-display);
  font-size:clamp(1.35rem,2.4vw,1.75rem);
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--bf-cream-100);
}

.bf-grid{
  display:grid;
  gap:clamp(1rem,2.5vw,2rem);
  grid-template-columns:1fr;
}

.bf-card{
  position:relative;
  padding:clamp(1.1rem,2vw,1.6rem);
  border:1px solid var(--bf-line);
  border-radius:var(--bf-radius);
  background:linear-gradient(180deg,rgba(14,47,74,.72),rgba(7,26,43,.92));
  transition:border-color var(--bf-ease),box-shadow var(--bf-ease),transform var(--bf-ease);
}
.bf-card:hover{
  border-color:rgba(43,227,198,.55);
  box-shadow:0 26px 52px -40px rgba(43,227,198,.75);
}

.bf-tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.28rem .62rem;
  border:1px solid transparent;
  border-radius:6px;
  font-size:11.5px;font-weight:600;letter-spacing:.06em;line-height:1.4;
}
.bf-tag--cyan{background:rgba(43,227,198,.14);color:var(--bf-cyan-500);border-color:rgba(43,227,198,.38);}
.bf-tag--coral{background:var(--bf-coral-500);color:#2A0C03;border-color:rgba(255,107,74,.62);}
.bf-tag--moss{background:var(--bf-moss-500);color:var(--bf-cream-100);border-color:rgba(95,140,106,.7);}
.bf-tag--clay{background:var(--bf-clay-500);color:var(--bf-cream-100);border-color:rgba(185,107,75,.7);}
.bf-tag--ghost{background:rgba(138,154,168,.12);color:var(--bf-rock-400);border-color:rgba(138,154,168,.32);}

.bf-media{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--bf-line-cyan);
  border-radius:var(--bf-radius);
  background:
    radial-gradient(120% 90% at 82% 8%,rgba(43,227,198,.22),transparent 62%),
    linear-gradient(135deg,rgba(14,47,74,.95),rgba(3,11,18,.95));
}
.bf-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(43,227,198,.10) 0 1px,transparent 1px 16px);
  opacity:.6;
}
.bf-media img,
.bf-media video{
  width:100%;height:100%;
  object-fit:cover;
}
.bf-media--wide{aspect-ratio:21/9;}
.bf-media--tall{aspect-ratio:3/4;}
.bf-media--square{aspect-ratio:1/1;}
.bf-media__caption{
  margin-top:.65rem;
  font-size:12.5px;line-height:1.7;
  color:var(--bf-rock-400);
}

/* ---------- responsive ---------- */
@media (min-width:820px){
  .bf-grid--7-5{grid-template-columns:7fr 5fr;}
  .bf-grid--8-4{grid-template-columns:8fr 4fr;}
  .bf-grid--12{grid-template-columns:repeat(12,1fr);}
}

@media (min-width:720px){
  .bf-footer__grid{grid-template-columns:1fr 1fr;gap:2rem 2.5rem;}
}

@media (min-width:1000px){
  .bf-footer__grid{grid-template-columns:1fr 1fr 1.5fr;}
}

@media (max-width:1080px){
  .bf-brand__tag{display:none;}
  .bf-nav__link{padding:8px 10px;font-size:13px;}
  .bf-version{padding:8px 10px;font-size:11px;}
}

@media (max-width:900px){
  .bf-header__login{display:none;}
}

@media (max-width:860px){
  .bf-header__inner{flex-wrap:wrap;row-gap:0;}
  .bf-nav-toggle{display:block;}
  .bf-nav{
    display:none;
    order:5;
    flex:0 0 100%;
    margin:.55rem 0 0;
    padding:8px;
    border-radius:22px;
  }
  .bf-header[data-open] .bf-nav{display:block;}
  .bf-nav__list{flex-direction:column;align-items:stretch;gap:2px;}
  .bf-nav__link{padding:.8rem 1rem;font-size:15px;border-radius:16px;}
  .bf-nav__link[aria-current="page"]{box-shadow:none;}
}

@media (max-width:760px){
  .bf-version{display:none;}
}

@media (max-width:560px){
  .bf-header__cta{display:none;}
  .bf-brand__name{font-size:15px;}
  .bf-footer__base{flex-direction:column;align-items:flex-start;}
}

@media (max-width:400px){
  .bf-brand__mark{width:26px;height:26px;}
  .bf-nav-toggle{width:38px;height:38px;}
}

@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto;}
}