/* ============================================================
   DESIGN SYSTEM — Bocah Trade
   Direction: clean, confident fintech, now rebuilt around a
   full-bleed looping video background. Panels (cards, nav, footer,
   banded sections) are frosted glass — translucent + blurred — so
   the video stays visible through the UI everywhere it's safe to
   read text. The hero itself stays unblurred so the video reads at
   full clarity on first load; only a soft directional scrim sits
   behind the headline for contrast.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --bg:#FAFBFD;--bg-2:rgba(241,244,249,.55);--primary:#3A4DF0;--primary-2:#2A38C9;--accent:#0A0E1A;
  --success:#15803D;--warning:#C2730C;--danger:#DC2626;
  --text:#121829;--text-2:#5B6478;
  --border:rgba(18,24,41,.12);--card:rgba(255,255,255,.62);
  --shadow:0 1px 2px rgba(16,20,40,.04),0 14px 32px -12px rgba(16,20,40,.18);
  --shadow-sm:0 1px 2px rgba(16,20,40,.05);
  --shadow-lg:0 24px 56px -16px rgba(16,20,40,.3);
  --primary-soft:rgba(58,77,240,.14);
  --success-soft:rgba(21,128,61,.14);
  --warning-soft:rgba(194,115,12,.14);
  --danger-soft:rgba(220,38,38,.14);
  --glass-blur:blur(16px) saturate(150%);
  --scrim:linear-gradient(180deg, rgba(255,255,255,.42), rgba(241,244,249,.62));
  --hero-scrim:linear-gradient(100deg, rgba(255,255,255,.62) 0%, rgba(255,255,255,.22) 50%, transparent 78%);
  --radius:12px;--radius-sm:8px;--maxw:1180px;
  --ease:cubic-bezier(.22,1,.36,1);
  --font-head:'Space Grotesk',system-ui,sans-serif;
  --font-body:'IBM Plex Sans',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,monospace;
}
[data-theme="dark"]{
  --bg:#0A0E1A;--bg-2:rgba(14,20,36,.5);--primary:#5C6CFF;--primary-2:#7886FF;--accent:#E7EAF3;
  --success:#22C55E;--warning:#F0A93B;--danger:#F4495F;
  --text:#E7EAF3;--text-2:#8B93AA;
  --border:rgba(231,234,243,.14);--card:rgba(13,18,32,.55);
  --shadow:0 1px 2px rgba(0,0,0,.35),0 24px 56px -16px rgba(0,0,0,.65);
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow-lg:0 28px 64px -16px rgba(0,0,0,.75);
  --primary-soft:rgba(92,108,255,.18);
  --success-soft:rgba(34,197,94,.16);
  --warning-soft:rgba(240,169,59,.16);
  --danger-soft:rgba(244,73,95,.16);
  --scrim:linear-gradient(180deg, rgba(10,14,26,.5), rgba(10,14,26,.7));
  --hero-scrim:linear-gradient(100deg, rgba(10,14,26,.68) 0%, rgba(10,14,26,.28) 50%, transparent 78%);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{position:relative;font-family:var(--font-body);background:var(--bg);color:var(--text);line-height:1.7;font-size:17px;transition:background .35s var(--ease),color .35s var(--ease)}

/* ---------- live video background ----------
   .bg-video is the actual <video> element (added once in the HTML,
   muted/loop/playsinline, src assigned by js/bg-video.js so the
   right resolution loads for the viewport). It sits behind a tint
   scrim and a faint dot texture so panels above stay readable
   regardless of how bright a given video frame is. ---------- */
.bg-video{position:fixed;inset:0;z-index:-8;width:100%;height:100%;object-fit:cover;pointer-events:none;background:#0A0E1A}
body::before{
  content:'';position:fixed;inset:0;z-index:-7;pointer-events:none;
  background:var(--scrim);transition:background .35s var(--ease);
}
body::after{
  content:'';position:fixed;inset:0;z-index:-6;pointer-events:none;opacity:.35;
  background-image:radial-gradient(rgba(255,255,255,.5) 1px, transparent 1px);
  background-size:34px 34px;
  -webkit-mask-image:radial-gradient(120% 85% at 50% 0%, #000 35%, transparent 80%);
  mask-image:radial-gradient(120% 85% at 50% 0%, #000 35%, transparent 80%);
}
[data-theme="dark"] body::after{opacity:.16}
@media (prefers-reduced-motion: reduce){
  .bg-video{display:none}
}
h1,h2,h3,h4,h5{font-family:var(--font-head);color:var(--text);line-height:1.22;font-weight:600;letter-spacing:-.01em}
a{color:var(--primary);text-decoration:none;transition:color .18s var(--ease)}
a:hover{text-decoration:underline}
code,pre{font-family:var(--font-mono)}
img,svg{max-width:100%}
::selection{background:var(--primary);color:#fff}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--bg-2)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:99px;border:3px solid var(--bg-2)}
::-webkit-scrollbar-thumb:hover{background:var(--text-2)}
:focus-visible{outline:none;box-shadow:0 0 0 3px var(--primary-soft),0 0 0 1.5px var(--primary);border-radius:6px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

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

/* ---------- progress bar ---------- */
#progress-bar{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--primary),var(--primary-2));box-shadow:0 0 12px rgba(58,77,240,.55);z-index:1000;transition:width .1s linear}

/* ---------- nav ---------- */
header.nav{position:sticky;top:0;z-index:900;overflow:hidden;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);border-bottom:1px solid var(--border)}
header.nav::before{
  content:'';position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(100deg,transparent 0%,var(--primary-soft) 45%,var(--success-soft) 52%,transparent 60%);
  background-size:240% 100%;
  animation:navShimmer 8s linear infinite;
}
@keyframes navShimmer{0%{background-position:120% 0}100%{background-position:-60% 0}}
.nav-inner{display:flex;align-items:center;gap:20px;height:66px;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.brand {
  /* Premium Editorial Typography */
  font-family: "Playfair Display", "Didot", "Bodoni MT", serif;
  font-weight: 400;
  font-size: 1.15rem;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.brand .dot{position:relative;width:13px;height:13px;border-radius:4px;background:var(--primary);display:inline-block;box-shadow:0 0 0 0 rgba(58,77,240,.5)}
.brand .dot::after{content:'';position:absolute;inset:0;border-radius:4px;background:var(--primary);animation:brandPulse 2.6s var(--ease) infinite}
@keyframes brandPulse{0%{transform:scale(1);opacity:.55}80%,100%{transform:scale(2.6);opacity:0}}
.nav-links{display:flex;gap:18px;margin-left:auto;align-items:center}
.nav-links a{position:relative;color:var(--text-2);font-size:.95rem;font-weight:500;padding:4px 2px}
.nav-links a::after{content:'';position:absolute;left:0;right:100%;bottom:-2px;height:2px;background:var(--primary);transition:right .25s var(--ease);border-radius:2px}
.nav-links a:hover{color:var(--text);text-decoration:none}
.nav-links a:hover::after{right:0}
.nav-actions{display:flex;align-items:center;gap:10px}
.icon-btn{background:var(--bg-2);border:1px solid var(--border);color:var(--text);width:40px;height:40px;border-radius:10px;cursor:pointer;font-size:1.1rem;display:grid;place-items:center;transition:border-color .2s var(--ease),color .2s var(--ease),transform .15s var(--ease),background .2s var(--ease)}
.icon-btn:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-soft);transform:translateY(-1px)}
.icon-btn:active{transform:translateY(0) scale(.94)}
.search-box{position:relative}
.search-box input{background:var(--bg-2);border:1px solid var(--border);color:var(--text);border-radius:10px;padding:9px 14px;width:210px;font-family:var(--font-body);transition:border-color .2s var(--ease),box-shadow .2s var(--ease),width .25s var(--ease)}
.search-box input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft);width:240px}
.search-results{position:absolute;top:48px;right:0;width:340px;max-height:60vh;overflow:auto;background:var(--card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-lg);display:none;padding:6px}
.search-results.open{display:block;animation:dropIn .2s var(--ease)}
@keyframes dropIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}
.search-results a{display:block;padding:10px 12px;border-radius:8px;color:var(--text);transition:background .15s var(--ease)}
.search-results a:hover{background:var(--bg-2);text-decoration:none}
.search-results small{color:var(--text-2);display:block}
.menu-toggle{display:none}

/* ---------- hamburger / mobile nav — glassmorphism ---------- */
@media(max-width:920px){
  /* allow the glass panel to overflow the nav bar */
  header.nav{overflow:visible}

  /* desktop link row hidden by default on mobile */
  .nav-links{
    display:none;
    position:absolute;
    top:66px;left:0;right:0;
    flex-direction:column;
    align-items:flex-start;
    gap:4px;
    padding:14px 16px 20px;

    /* ── frosted glass panel ── */
    background:rgba(10,14,26,.52);
    backdrop-filter:blur(28px) saturate(200%) brightness(1.06);
    -webkit-backdrop-filter:blur(28px) saturate(200%) brightness(1.06);

    border-top:1px solid rgba(255,255,255,.07);
    border-bottom:1px solid rgba(255,255,255,.09);
    box-shadow:
      0 20px 40px -8px rgba(0,0,0,.45),
      inset 0 1px 0 rgba(255,255,255,.09),
      inset 0 -1px 0 rgba(0,0,0,.15);
  }

  /* open state — slide-down animation */
  .nav-links.open{
    display:flex;
    animation:mobileNavIn .28s var(--ease);
  }

  @keyframes mobileNavIn{
    from{opacity:0;transform:translateY(-10px)}
    to{opacity:1;transform:translateY(0)}
  }

  /* individual link pill hover */
  .nav-links a{
    /* reset the desktop underline trick */
    padding:10px 14px;
    border-radius:10px;
    border:1px solid transparent;
    width:100%;
    color:rgba(255,255,255,.72);
    font-size:.93rem;
    transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
  }
  .nav-links a::after{display:none} /* hide desktop underline indicator */
  .nav-links a:hover{
    color:#fff;
    background:rgba(255,255,255,.09);
    border-color:rgba(255,255,255,.1);
    text-decoration:none;
  }
  .nav-links a.active{
    color:#fff;
    background:rgba(92,108,255,.22);
    border-color:rgba(92,108,255,.35);
  }

  /* optional group labels inside the panel */
  .nav-link-group-label{
    font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
    color:rgba(255,255,255,.3);padding:4px 14px 2px;
    font-family:var(--font-head);display:block;
  }
  .nav-divider{
    width:100%;height:1px;
    background:rgba(255,255,255,.07);
    margin:8px 0;
  }

  /* hamburger button — glass pill style */
  .menu-toggle{
    display:grid;
    background:rgba(255,255,255,.08);
    border:1px solid rgba(255,255,255,.13);
    color:var(--text);
    width:40px;height:40px;border-radius:10px;
    cursor:pointer;font-size:1.1rem;
    place-items:center;
    transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
  }
  .menu-toggle:hover{
    background:var(--primary-soft);
    border-color:color-mix(in srgb,var(--primary) 45%,transparent);
    color:var(--primary);
  }
  .menu-toggle.active{
    background:var(--primary-soft);
    border-color:color-mix(in srgb,var(--primary) 55%,transparent);
    color:var(--primary);
  }

  .search-box input{width:150px}
  .search-box input:focus{width:170px}
}

/* ---------- buttons ---------- */
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:600;font-family:var(--font-head);cursor:pointer;border:1px solid transparent;transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease)}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn:active{transform:translateY(0) scale(.98)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 8px 20px -4px rgba(58,77,240,.45)}
.btn-primary:hover{box-shadow:0 12px 28px -4px rgba(58,77,240,.55)}
.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-soft)}

/* ---------- hero ---------- */
.hero{position:relative;padding:96px 0 76px;overflow:hidden;isolation:isolate}
.hero::before{content:'';position:absolute;inset:0;z-index:-1;background:var(--hero-scrim)}
.hero h1{font-size:3.1rem;font-weight:700;letter-spacing:-.02em}
.hero .tagline{color:var(--primary);font-weight:600;font-family:var(--font-head);font-size:1.4rem;margin:14px 0 8px}
.hero .subtitle{color:var(--text-2);font-size:1.15rem;max-width:680px}
.hero .cta{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap}
@media(max-width:720px){.hero h1{font-size:2.2rem}.hero .tagline{font-size:1.15rem}}

/* ---------- sections / grid ---------- */
section{padding:56px 0}
.section-title{font-size:1.8rem;margin-bottom:6px}
.section-sub{color:var(--text-2);margin-bottom:30px}
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid-3{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.grid-3,.grid-2{grid-template-columns:1fr}}

/* ---------- cards ---------- */
.card{background:var(--card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm);transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease)}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:color-mix(in srgb,var(--primary) 30%,var(--border))}
.card .tag{display:inline-block;font-size:.72rem;font-weight:600;color:var(--primary);background:var(--primary-soft);padding:4px 10px;border-radius:999px;margin-bottom:10px;letter-spacing:.02em;text-transform:uppercase}
.card h3{font-size:1.15rem;margin-bottom:8px}
.card p{color:var(--text-2);font-size:.95rem}
.card .meta{color:var(--text-2);font-size:.82rem;margin-top:12px;font-family:var(--font-mono)}

/* banded sections that set background:var(--bg-2) inline (Featured /
   Latest / Testimonials etc.) — glass-ify whichever ones are present */
#featured,#latest,#testimonials{backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}

/* ---------- roadmap / levels ---------- */
.roadmap{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.roadmap::before{content:'';position:absolute;top:24px;left:8%;right:8%;height:2px;background:repeating-linear-gradient(90deg,var(--border) 0 8px,transparent 8px 14px);z-index:0}
@media(max-width:900px){.roadmap{grid-template-columns:1fr}.roadmap::before{display:none}}
.level{position:relative;z-index:1;border-radius:var(--radius);padding:26px;border:1px solid var(--border);background:var(--card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);transition:transform .22s var(--ease),box-shadow .22s var(--ease)}
.level:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.level .badge{font-family:var(--font-head);font-weight:700;font-size:.78rem;letter-spacing:.04em;text-transform:uppercase;color:#fff;padding:6px 13px;border-radius:8px;display:inline-block}
.level.beg .badge{background:var(--success)}
.level.int .badge{background:var(--warning)}
.level.adv .badge{background:var(--accent)}
[data-theme="dark"] .level.adv .badge{background:var(--primary)}
.level ul{list-style:none;margin-top:16px;display:grid;gap:8px}
.level ul a{color:var(--text-2);font-size:.92rem;transition:color .15s var(--ease)}
.level ul a:hover{color:var(--primary)}

/* ---------- chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.chip{border:1px solid var(--border);background:var(--card);color:var(--text-2);padding:8px 16px;border-radius:999px;cursor:pointer;font-size:.88rem;font-weight:500;transition:all .18s var(--ease)}
.chip:hover{border-color:var(--primary);color:var(--primary)}
.chip.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 6px 16px -4px rgba(58,77,240,.45)}

/* ---------- article ---------- */
.article-wrap{display:grid;grid-template-columns:1fr 260px;gap:40px;max-width:var(--maxw);margin:0 auto;padding:36px 20px}
@media(max-width:980px){.article-wrap{grid-template-columns:1fr}.toc-side{display:none}}
.breadcrumb{color:var(--text-2);font-size:.85rem;margin-bottom:18px}
.breadcrumb a{color:var(--text-2)}
.article-hero{
  border-radius:var(--radius);
  overflow:hidden;
  margin-bottom:22px;
  border:1px solid var(--border);
  background:#0F172A; /* solid fallback so nothing bleeds through */
  line-height:0; /* kills the inline baseline gap under the svg */
}
.article-hero svg{
  display:block; /* removes inline whitespace gap entirely */
  width:100%;
  height:auto;
}article h1{font-size:2.3rem;margin-bottom:10px}
article .article-meta{color:var(--text-2);font-size:.88rem;margin-bottom:24px;display:flex;gap:16px;flex-wrap:wrap;font-family:var(--font-mono)}
article h2{font-size:1.55rem;margin:34px 0 12px;scroll-margin-top:90px}
article h3{font-size:1.2rem;margin:22px 0 10px;scroll-margin-top:90px}
article p{margin:12px 0}
article ul,article ol{margin:12px 0 12px 22px}
article li{margin:6px 0}
article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:.92rem;font-family:var(--font-mono)}
article th,article td{border:1px solid var(--border);padding:10px 12px;text-align:left}
article th{background:var(--bg-2);font-family:var(--font-head);font-size:.85rem;text-transform:uppercase;letter-spacing:.03em}
pre{background:#0B1120;color:#E2E8F0;padding:18px;border-radius:var(--radius-sm);overflow:auto;margin:16px 0;font-size:.88rem;box-shadow:inset 0 0 0 1px rgba(255,255,255,.06)}
p code,li code{background:var(--bg-2);padding:2px 7px;border-radius:6px;font-size:.86rem;color:var(--primary);border:1px solid var(--border)}

.callout{border-radius:var(--radius-sm);padding:16px 18px;margin:18px 0;border-left:4px solid;background:var(--bg-2);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}
.callout .c-title{font-family:var(--font-head);font-weight:600;margin-bottom:4px;display:flex;gap:8px;align-items:center}
.callout.tip{border-color:var(--success);background:var(--success-soft)}
.callout.warning{border-color:var(--warning);background:var(--warning-soft)}
.callout.note{border-color:var(--primary);background:var(--primary-soft)}
.callout p{margin:4px 0;color:var(--text)}

.key-takeaways{background:var(--bg-2);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:22px 0}
.key-takeaways h3{margin-top:0}

.toc-side{position:sticky;top:90px;align-self:start;max-height:calc(100vh - 120px);overflow:auto;padding-left:2px}
.toc-side h4{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-2);margin-bottom:12px;font-family:var(--font-mono)}
.toc-side ul{list-style:none;display:grid;gap:9px;border-left:2px solid var(--border);padding-left:14px}
.toc-side a{position:relative;color:var(--text-2);font-size:.88rem;transition:color .15s var(--ease)}
.toc-side a::before{content:'';position:absolute;left:-17px;top:50%;width:6px;height:6px;border-radius:50%;background:transparent;transform:translateY(-50%);transition:background .15s var(--ease)}
.toc-side a:hover{color:var(--text)}
.toc-side a.active{color:var(--primary);font-weight:600}
.toc-side a.active::before{background:var(--primary)}

/* ---------- FAQ ---------- */
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin:10px 0;overflow:hidden;background:var(--card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.faq-item.open{border-color:color-mix(in srgb,var(--primary) 35%,var(--border));box-shadow:var(--shadow-sm)}
.faq-q{width:100%;text-align:left;background:none;border:none;color:var(--text);font-family:var(--font-head);font-weight:600;font-size:1rem;padding:16px 18px;cursor:pointer;display:flex;justify-content:space-between;gap:12px;transition:background .15s var(--ease)}
.faq-q:hover{background:var(--bg-2)}
.faq-a{padding:0 18px;max-height:0;overflow:hidden;transition:max-height .35s var(--ease),padding .35s var(--ease);color:var(--text-2)}
.faq-item.open .faq-a{max-height:800px;padding:0 18px 16px}
.faq-item.open .faq-q .chev{transform:rotate(180deg);color:var(--primary)}
.faq-q .chev{transition:transform .3s var(--ease)}

/* ---------- prev/next ---------- */
.prevnext{display:flex;justify-content:space-between;gap:16px;margin-top:40px;flex-wrap:wrap}
.prevnext a{flex:1;min-width:200px;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;color:var(--text);background:var(--card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease)}
.prevnext a:hover{transform:translateY(-3px);border-color:var(--primary);box-shadow:var(--shadow-sm);text-decoration:none}
.prevnext small{color:var(--text-2);font-family:var(--font-mono)}

/* ---------- to top ---------- */
#to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;border:none;cursor:pointer;font-size:1.2rem;display:none;box-shadow:0 10px 24px -4px rgba(58,77,240,.5);z-index:800;transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
#to-top.show{display:grid;place-items:center;animation:popIn .25s var(--ease)}
#to-top:hover{transform:translateY(-3px) scale(1.04)}
@keyframes popIn{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}

/* ---------- calculator ---------- */
.calc{background:var(--card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.calc label{display:block;font-weight:600;font-size:.9rem;margin:12px 0 6px;font-family:var(--font-head)}
.calc input,.calc select{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-2);color:var(--text);font-family:var(--font-mono);transition:border-color .18s var(--ease),box-shadow .18s var(--ease)}
.calc input:focus,.calc select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
.calc .result{margin-top:18px;padding:16px;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-family:var(--font-mono);font-weight:600;letter-spacing:.01em;box-shadow:inset 0 0 0 1px rgba(255,255,255,.06)}
[data-theme="dark"] .calc .result{background:#070A14}

.quote{font-style:italic;color:var(--text)}
.who{margin-top:12px;font-weight:600;font-family:var(--font-head);color:var(--text-2);font-size:.9rem}

/* ---------- footer ---------- */
footer.site{margin-top:60px;background:linear-gradient(135deg,var(--primary-soft),rgba(10,14,26,.06));border-top:1px solid var(--border);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding:50px 20px 30px;max-width:var(--maxw);margin:0 auto}
@media(max-width:860px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}
footer.site h4{font-size:1rem;margin-bottom:14px}
footer.site ul{list-style:none;display:grid;gap:8px}
footer.site a{color:var(--text-2);font-size:.92rem;transition:color .15s var(--ease)}
footer.site a:hover{color:var(--primary)}
.footer-about p{color:var(--text-2);font-size:.92rem;margin-top:10px}
.socials{display:flex;gap:12px;margin-top:14px}
.socials a{width:40px;height:40px;border-radius:10px;background:var(--card);border:1px solid var(--border);display:grid;place-items:center;color:var(--text);transition:transform .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease)}
.socials a:hover{transform:translateY(-3px);border-color:var(--primary);color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);padding:20px;text-align:center;color:var(--text-2);font-size:.85rem;max-width:var(--maxw);margin:0 auto}
.footer-bottom .disclaimer{margin-top:8px;font-size:.79rem;opacity:.8}