:root{--ink:#0c1722;--ink2:#15283b;--paper:#f5f1e8;--card:#fff;--lime:#d3e512;--lime2:#a9b80c;--coral:#ff5a3c;--line:#e0d9c8;--txt:#1b2733;--mut:#566474}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--txt);font:17px/1.7 "Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;overflow-wrap:anywhere}
img{max-width:100%;height:auto;display:block}
a{color:#0b5d6b;text-underline-offset:3px}
a:hover{color:var(--coral)}
h1,h2,h3{font-family:"Trebuchet MS","Segoe UI",system-ui,sans-serif;line-height:1.15;margin:0 0 .6em;color:var(--ink);letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,6.4vw,3.1rem);font-weight:800}
h2{font-size:clamp(1.45rem,4.6vw,2.05rem);font-weight:800}
h3{font-size:1.2rem;font-weight:700}
p{margin:0 0 1.05em}
.ib-wrap{max-width:1120px;margin:0 auto;padding:0 20px}
/* masthead */
.ib-top{background:var(--ink);position:sticky;top:0;z-index:30;border-bottom:3px solid var(--lime)}
.ib-bar{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:10px 0}
.ib-logo{display:block;max-width:150px;flex:0 0 auto}
.ib-logo img{width:100%;height:auto}
.ib-burger{width:44px;height:40px;margin-left:auto;padding:0;border:1px solid #3b556d;border-radius:8px;background:transparent;color:#fff;font:600 11px/1 "Segoe UI",sans-serif;cursor:pointer}
.ib-nav{display:none}
.ib-nav--open{display:flex;flex-direction:column;flex:0 0 100%;width:100%;gap:2px;padding:8px 0 12px}
.ib-nav a{color:#e8eef3;text-decoration:none;padding:11px 8px;border-radius:8px;font-weight:600}
.ib-nav a:hover,.ib-nav a[aria-current]{background:var(--ink2);color:var(--lime)}
.ib-nav__cta{background:var(--lime);color:var(--ink)!important;text-align:center;margin-top:6px}
.ib-bar__cta{display:none}
/* buttons */
.ib-btn{display:inline-flex;align-items:center;justify-content:center;background:var(--lime);color:var(--ink);font-weight:800;text-decoration:none;padding:12px 24px;border-radius:999px;border:2px solid var(--lime);transition:transform .15s,background .15s}
.ib-btn:hover{background:#fff;color:var(--ink);transform:translateY(-2px)}
.ib-btn--ghost{background:transparent;color:#fff;border-color:#ffffff66}
.ib-btn--ghost:hover{background:#ffffff1f;color:#fff}
.ib-cta{margin:0 0 1.6rem}
/* breadcrumb */
.ib-crumb{background:#ebe5d5;font-size:.9rem;color:var(--mut);padding:9px 0}
.ib-crumb a{color:var(--mut)}
/* hero */
.ib-hero{background:radial-gradient(900px 420px at 85% -10%,#2a4a1a 0,transparent 60%),linear-gradient(160deg,var(--ink) 0,var(--ink2) 100%);color:#e8eef3;padding:34px 0 40px}
.ib-hero h1{color:#fff}
.ib-hero .openpara{font-size:1.1rem;color:#d3dde6;max-width:62ch}
.ib-hero__grid{display:grid;gap:28px}
.ib-hero__fig{margin:0}
.ib-hero__fig img{border-radius:18px;border:2px solid #ffffff22;box-shadow:0 18px 50px #00000066}
.ib-hero__act{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0 0}
.ib-fact{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:24px 0 0;padding:0;list-style:none}
.ib-fact li{background:#ffffff12;border:1px solid #ffffff22;border-radius:14px;padding:12px 14px}
.ib-fact b{display:block;color:var(--lime);font:800 1.25rem/1.1 "Trebuchet MS",sans-serif}
.ib-fact span{font-size:.85rem;color:#b9c7d3}
/* bands */
.ib-sec{padding:44px 0;counter-increment:sec}
main{counter-reset:sec}
.ib-sec:nth-of-type(even){background:#fbf9f3}
.ib-sec:nth-of-type(odd){background:var(--paper)}
.ib-sec h2::before{content:counter(sec,decimal-leading-zero);display:inline-block;margin-right:.55em;padding:.18em .5em;border-radius:8px;background:var(--ink);color:var(--lime);font-size:.62em;vertical-align:.18em;letter-spacing:.04em}
.ib-sec h3{margin-top:1.3em}
.ib-grid2{display:grid;gap:26px}
.ib-fig{margin:0 0 1.5em}
.ib-fig img{border-radius:16px;border:1px solid var(--line);box-shadow:0 10px 30px #0c172222}
/* lists, steps, notes */
.ib-list{margin:0 0 1.2em;padding:0;list-style:none}
.ib-list li{position:relative;padding:8px 0 8px 30px;border-bottom:1px dashed var(--line)}
.ib-list li::before{content:"";position:absolute;left:4px;top:1.05em;width:12px;height:12px;border-radius:3px;background:var(--lime2);transform:rotate(45deg)}
.ib-steps{margin:0 0 1.4em;padding:0;list-style:none;counter-reset:st}
.ib-steps li{position:relative;display:block;margin:0 0 14px;padding:14px 16px 14px 62px;background:var(--card);border:1px solid var(--line);border-radius:14px;counter-increment:st}
.ib-steps li::before{content:counter(st);position:absolute;left:14px;top:12px;width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--lime);font:800 1rem/34px "Trebuchet MS",sans-serif;text-align:center}
.ib-step__t{display:block;font-weight:800;color:var(--ink)}
.ib-step__d{display:block;color:var(--mut)}
.ib-note{display:block;margin:0 0 1.4em;padding:14px 18px;border-radius:14px;border-left:6px solid var(--lime2);background:#f0f4c7}
.ib-note--coral{border-left-color:var(--coral);background:#ffe9e3}
.ib-note--ink{border-left-color:var(--lime);background:var(--ink);color:#e8eef3}
.ib-note strong{display:block;margin-bottom:2px}
.ib-note--ink strong{color:var(--lime)}
.ib-cards{display:grid;gap:14px;margin:0 0 1.5em}
.ib-card{display:block;background:var(--card);border:1px solid var(--line);border-top:5px solid var(--lime2);border-radius:14px;padding:16px 18px}
.ib-card__k{display:block;font:700 .75rem/1 "Segoe UI",sans-serif;text-transform:uppercase;letter-spacing:.08em;color:var(--coral);margin-bottom:6px}
.ib-card__t{display:block;font:800 1.2rem/1.2 "Trebuchet MS",sans-serif;color:var(--ink);margin-bottom:6px}
.ib-card__d{display:block;color:var(--mut);font-size:.96rem}
.grid-pane{overflow-x:auto;margin:0 0 1.5em;border:1px solid var(--line);border-radius:14px;background:var(--card)}
.ib-table{border-collapse:collapse;width:100%;font-size:.95rem}
.grid-pane .ib-table{min-width:480px}
.ib-table caption{caption-side:top;text-align:left;font-weight:800;padding:12px 14px;color:var(--ink)}
.ib-table th{background:var(--ink);color:var(--lime);text-align:left;padding:10px 14px}
.ib-table td{padding:10px 14px;border-top:1px solid var(--line);vertical-align:top}
.ib-table tbody tr:nth-child(even){background:#faf8f1}
/* promo widget */
.ib-promo{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 1.5em;padding:14px 16px;background:var(--ink);color:#e8eef3;border-radius:16px;border:2px dashed var(--lime)}
.ib-promo__l{font-size:.85rem;color:#b9c7d3;flex:1 0 100%}
.ib-promo__c{font:800 1.05rem/1 "Consolas",monospace;color:var(--ink);background:var(--lime);padding:8px 14px;border-radius:8px;letter-spacing:.08em}
.ib-promo__b{border:0;border-radius:8px;padding:9px 16px;background:#fff;color:var(--ink);font-weight:800;cursor:pointer}
.ib-promo__b.is-done{background:var(--coral);color:#fff}
.ib-promo__h{flex:1 0 100%;font-size:.85rem;color:#b9c7d3}
/* tabs */
.ib-tabs{margin:0 0 1.5em;background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.ib-tabs__bar{display:flex;background:var(--ink)}
.ib-tab{flex:1;border:0;background:transparent;color:#b9c7d3;padding:13px 8px;font-weight:700;cursor:pointer;font-size:.95rem}
.ib-tab.is-on{background:var(--lime);color:var(--ink)}
.ib-pane{display:none;padding:16px 18px}
.ib-pane.is-on{display:block}
.ib-pane p:last-child{margin-bottom:0}
/* calculator */
.ib-calc{margin:0 0 1.5em;padding:18px;background:var(--ink);color:#e8eef3;border-radius:18px}
.ib-calc__row{display:grid;gap:6px;margin-bottom:12px}
.ib-calc label{font-weight:700;font-size:.9rem;color:var(--lime)}
.ib-calc select,.ib-calc input{width:100%;padding:11px 12px;border-radius:10px;border:1px solid #3b556d;background:#0f2133;color:#fff;font:600 1rem "Segoe UI",sans-serif}
.ib-calc__out{display:grid;gap:10px;margin:14px 0 0}
.ib-calc__out div{background:#ffffff12;border-radius:12px;padding:10px 14px}
.ib-calc__out dt{font-size:.82rem;color:#b9c7d3}
.ib-calc__out dd{margin:0;font:800 1.3rem/1.2 "Trebuchet MS",sans-serif;color:#fff}
.ib-calc__h{display:block;margin-top:10px;font-size:.85rem;color:#ffb4a4}
/* faq */
.ib-faq{padding:44px 0 56px;background:#fbf9f3}
.ib-q{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:0 0 10px;overflow:hidden}
.ib-q summary{cursor:pointer;list-style:none;padding:15px 52px 15px 18px;font-weight:700;color:var(--ink);position:relative}
.ib-q summary::-webkit-details-marker{display:none}
.ib-q summary::after{content:"+";position:absolute;right:18px;top:11px;width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--lime);text-align:center;font:800 1.2rem/28px sans-serif}
.ib-q[open] summary::after{content:"–"}
.ib-a{padding:0 18px 6px;color:var(--txt)}
/* footer */
.ib-foot{background:var(--ink);color:#c5d1dc;padding:40px 0 28px;border-top:3px solid var(--lime)}
.ib-foot__grid{display:grid;gap:26px}
.ib-foot h3{color:#fff;font-size:1rem}
.ib-foot ul{margin:0;padding:0;list-style:none}
.ib-foot li{padding:3px 0}
.ib-foot a{color:#c5d1dc}
.ib-foot a:hover{color:var(--lime)}
.ib-foot__sm{font-size:.9rem}
.ib-foot__c{margin:24px 0 0;font-size:.85rem;color:#8ea0b0;border-top:1px solid #ffffff1f;padding-top:16px}
.ib-age{display:inline-block;border:2px solid var(--coral);color:#fff;border-radius:50%;padding:7px 9px;font-weight:800}
.ib-up{position:fixed;right:16px;bottom:16px;width:44px;height:44px;border-radius:50%;border:0;background:var(--lime);color:var(--ink);font:800 1.3rem/1 sans-serif;cursor:pointer;box-shadow:0 6px 18px #0006}
.ib-up[hidden]{display:none}
.ib-trust h1{margin-bottom:.4em}
.ib-trust .ib-wrap{max-width:820px}
@media (min-width:700px){
  .ib-cards{grid-template-columns:repeat(2,1fr)}
  .ib-fact{grid-template-columns:repeat(4,1fr)}
  .ib-foot__grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr}
  .ib-calc__out{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:900px){
  .ib-burger{display:none}
  .ib-nav{display:flex;flex:0 0 auto;width:auto;margin-left:auto;gap:2px;padding:0}
  .ib-nav--open{flex-direction:row;flex:0 0 auto;width:auto;padding:0}
  .ib-nav a{padding:8px 10px;font-size:.95rem}
  .ib-nav__cta{display:none}
  .ib-bar__cta{display:inline-flex;align-items:center;justify-content:center;background:var(--lime);color:var(--ink);font-weight:800;text-decoration:none;padding:9px 20px;border-radius:999px;white-space:nowrap}
  .ib-bar__cta:hover{background:#fff;color:var(--ink)}
  .ib-hero{padding:56px 0 62px}
  .ib-hero__grid{grid-template-columns:1.05fr .95fr;align-items:center}
  .ib-grid2{grid-template-columns:1fr 1fr;align-items:start}
  .ib-cards--3{grid-template-columns:repeat(3,1fr)}
  .ib-sec{padding:58px 0}
}