:root{
  --bg:#0B0D12;--surface:#121620;--surface-2:#0E121A;--border:#232A38;--border-2:#2A3242;
  --text:#E8ECF3;--muted:#9AA4B5;--dim:#8A94A6;
  --red:#E63946;--red-dark:#C92A36;--blue:#2EC5FF;--blue-soft:#0E2430;--blue-line:#1F4B5E;
  --green:#4ADE80;--loss:#FF6B75;
  --font:'Sora',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,Consolas,monospace;
  --radius:16px;--max:1200px;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6}
a{color:var(--blue);text-decoration:none}
a:hover{color:#7FDBFF;text-decoration:underline}
img,svg{max-width:100%}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(32px,5vw,56px);font-weight:800}
h2{font-size:clamp(24px,3vw,32px);font-weight:800}
h3{font-size:19px;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:var(--blue);color:#06121A;padding:10px 14px;border-radius:8px;z-index:99}

/* header */
.site-header{border-bottom:1px solid #1E2430;position:relative;z-index:10;background:var(--bg)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:72px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;font-size:21px;letter-spacing:-.02em}
.brand:hover{text-decoration:none;color:var(--text)}
.brand img{width:38px;height:38px}
.brand span{color:var(--red)}
.nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav a{color:#B4BDCC;padding:10px 12px;border-radius:8px;font-size:15px}
.nav a:hover,.nav a[aria-current=page]{color:var(--text);background:var(--surface);text-decoration:none}
.nav .cta{background:var(--blue);color:#06121A;font-weight:700;margin-left:6px}
.nav .cta:hover{background:#5ad2ff;color:#06121A}
.menu-btn{display:none;background:none;border:1px solid var(--border-2);color:var(--text);border-radius:10px;width:44px;height:44px;cursor:pointer}
@media (max-width:820px){
  .menu-btn{display:inline-flex;align-items:center;justify-content:center}
  .nav{display:none;width:100%;flex-direction:column;align-items:stretch;padding-bottom:14px}
  .nav.open{display:flex}
  .nav .cta{margin-left:0;text-align:center}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;padding:14px 22px;border-radius:12px;font-size:16px;border:1px solid transparent;cursor:pointer;font-family:var(--font)}
.btn:hover{text-decoration:none}
.btn-red{background:var(--red);color:#fff}.btn-red:hover{background:#f04a57;color:#fff}
.btn-ghost{border-color:var(--border-2);color:var(--text)}.btn-ghost:hover{border-color:var(--blue);color:var(--text)}
.btn-blue{background:var(--blue);color:#06121A}.btn-blue:hover{background:#5ad2ff;color:#06121A}

/* hero */
.hero{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,440px),1fr));gap:44px;align-items:center;padding:72px 0 56px}
.pill{display:inline-block;font-family:var(--mono);font-size:13px;color:var(--blue);border:1px solid var(--blue-line);padding:7px 14px;border-radius:999px;margin-bottom:20px}
.hero h1 .hl{color:var(--red)}
.lead{font-size:18px;color:var(--muted);max-width:560px}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}

/* panels / calculators */
.panel{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:24px}
.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}
.panel-head h2,.panel-head h3{margin:0;font-size:19px}
.tag{font-family:var(--mono);font-size:12px;color:var(--muted)}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));gap:14px}
.field{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}
.field input,.field select{background:var(--bg);border:1px solid var(--border-2);border-radius:10px;padding:12px;color:var(--text);font-family:var(--mono);font-size:15px;width:100%;min-height:46px}
.field input:focus,.field select:focus{outline:2px solid var(--blue);outline-offset:1px;border-color:var(--blue)}
.seg{display:flex;background:var(--bg);border:1px solid var(--border-2);border-radius:10px;padding:4px;gap:4px}
.seg button{flex:1;background:none;border:0;color:var(--muted);font-family:var(--font);font-weight:700;font-size:14px;padding:10px;border-radius:7px;cursor:pointer;min-height:38px}
.seg button[aria-pressed=true]{background:var(--surface);color:var(--text)}
.seg button.long[aria-pressed=true]{background:#123524;color:var(--green)}
.seg button.short[aria-pressed=true]{background:#3a1218;color:var(--loss)}
.results{margin-top:16px;background:var(--bg);border:1px solid var(--blue-line);border-radius:14px;padding:18px;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr));gap:14px}
.res .k{font-size:12px;color:var(--muted)}
.res .v{font-family:var(--mono);font-size:22px;font-weight:600;color:var(--blue);word-break:break-word}
.res .v.pos{color:var(--green)}.res .v.neg{color:var(--loss)}.res .v.plain{color:var(--text)}
.note{font-size:13px;color:var(--dim);margin-top:12px}
.err{color:var(--loss);font-size:14px;margin-top:10px}
.rows{display:flex;flex-direction:column;gap:10px}
.row{display:grid;grid-template-columns:1fr 1fr 44px;gap:10px;align-items:end}
.icon-btn{background:var(--bg);border:1px solid var(--border-2);color:var(--muted);border-radius:10px;height:46px;cursor:pointer;font-size:18px}
.icon-btn:hover{color:var(--loss);border-color:var(--loss)}
.add-btn{margin-top:10px;background:none;border:1px dashed var(--border-2);color:var(--blue);border-radius:10px;padding:12px;font-family:var(--font);font-weight:600;cursor:pointer;width:100%}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:18px}
.tabs button{background:var(--bg);border:1px solid var(--border-2);color:var(--muted);font-family:var(--font);font-weight:700;padding:10px 16px;border-radius:10px;cursor:pointer;min-height:44px}
.tabs button[aria-selected=true]{border-color:var(--blue);color:var(--text);background:var(--blue-soft)}
.check{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted);min-height:44px}
.check input{width:20px;height:20px;accent-color:var(--blue)}

/* sections */
.section{padding:40px 0 64px}
.section-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:28px}
.section-head p{color:var(--muted);margin:0}
.search{display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:0 14px;min-width:min(100%,280px)}
.search input{background:transparent;border:0;outline:none;color:var(--text);font-family:var(--font);font-size:15px;padding:13px 0;flex:1}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr));gap:18px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:12px;color:var(--text)}
.card:hover{border-color:var(--blue);text-decoration:none;color:var(--text)}
.card .top{display:flex;justify-content:space-between;align-items:center}
.code{min-width:52px;height:44px;padding:0 10px;border-radius:10px;background:var(--blue-soft);color:var(--blue);font-family:var(--mono);font-weight:600;font-size:14px;display:flex;align-items:center;justify-content:center}
.hot{font-size:12px;font-weight:700;color:#fff;background:var(--red-dark);padding:4px 10px;border-radius:999px}
.card .t{font-size:19px;font-weight:700}
.card .d{font-size:14px;color:var(--muted);line-height:1.55}
.card .o{font-size:14px;font-weight:600;color:var(--blue);margin-top:auto}

/* ad (house) */
.bsp-note{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--dim);margin-bottom:8px}
.bsp-box{position:relative;background:#12141B;border:1px solid #2A2F3A;border-radius:16px;padding:28px 32px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px}
.bsp-box .badge{position:absolute;top:10px;right:12px;font-size:11px;font-weight:700;color:var(--dim);border:1px solid #3A4150;padding:1px 7px;border-radius:4px}
.bsp-box .in{display:flex;align-items:center;gap:16px;max-width:700px}
.bsp-box .bs{width:58px;height:58px;flex-shrink:0;border-radius:50%;object-fit:cover;display:block}
.bsp-box .sp{font-size:13px;color:var(--dim)}
.bsp-box .h{font-size:21px;font-weight:800;line-height:1.25}
.bsp-box .s{font-size:15px;color:var(--muted)}
.gap-slot{margin:28px 0;min-height:0}

/* article / content */
.crumbs{font-size:14px;color:var(--dim);padding-top:24px}
.crumbs a{color:var(--muted)}
.page-head{padding:20px 0 28px}
.page-head p{color:var(--muted);font-size:17px;max-width:760px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;align-items:start}
@media (max-width:980px){.layout{grid-template-columns:minmax(0,1fr)}}
.side{display:flex;flex-direction:column;gap:18px}
.side .panel{padding:20px}
.side ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.side li a{display:block;padding:8px 10px;border-radius:8px;color:var(--muted);font-size:15px}
.side li a:hover,.side li a[aria-current=page]{background:var(--bg);color:var(--text);text-decoration:none}
.prose{max-width:760px;margin-top:36px}
.prose h2{margin-top:40px;font-size:26px}
.prose h3{margin-top:28px}
.prose p,.prose li{color:#C9D0DC}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-bottom:6px}
.formula{font-family:var(--mono);background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px;color:var(--text);font-size:14px;overflow-x:auto;white-space:pre}
.table-box{overflow-x:auto;border:1px solid var(--border);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--border)}
th{color:var(--muted);font-weight:600;background:var(--surface)}
td{font-family:var(--mono)}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:0 18px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';float:right;color:var(--blue);font-family:var(--mono)}
.faq details[open] summary::after{content:'-'}
.faq details p{color:#C9D0DC}
.legal{max-width:820px;padding-bottom:64px}
.legal h2{font-size:22px;margin-top:34px}
.legal p,.legal li{color:#C9D0DC}
.updated{color:var(--dim);font-size:14px}

/* footer */
.site-footer{border-top:1px solid #1E2430;margin-top:40px}
.foot{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));gap:28px;padding:44px 0 28px}
.foot h3{font-size:14px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.foot ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.foot a{color:#B4BDCC;font-size:14px}
.foot p{font-size:14px;color:var(--dim)}
.copy{border-top:1px solid #1E2430;padding:20px 0 28px;font-size:13px;color:var(--dim);display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}